chamilo / chamilo-lms

main/exercise/exercise.class.php

<?php

/* For licensing terms, see /license.txt */

use Chamilo\CoreBundle\Component\Utils\ChamiloApi;
use Chamilo\CoreBundle\Entity\GradebookLink;
use Chamilo\CoreBundle\Entity\TrackEExerciseConfirmation;
use Chamilo\CoreBundle\Entity\TrackEHotspot;
use Chamilo\CourseBundle\Entity\CExerciseCategory;
use ChamiloSession as Session;
use Doctrine\DBAL\Types\Type;

/**
 * Class Exercise.
 *
 * Allows to instantiate an object of type Exercise
 *
 * @todo use getters and setters correctly
 *
 * @author Olivier Brouckaert
 * @author Julio Montoya Cleaning exercises
 * Modified by Hubert Borderiou #294
 */
class Exercise
{
    public const PAGINATION_ITEMS_PER_PAGE = 20;
    public $iid;
    public $name;
    public $title;
    public $exercise;
    public $description;
    public $sound;
    public $type; //ALL_ON_ONE_PAGE or ONE_PER_PAGE
    public $random;
    public $random_answers;
    public $active;
    public $timeLimit;
    public $attempts;
    public $feedback_type;
    public $end_time;
    public $start_time;
    public $questionList; // array with the list of this exercise's questions
    /* including question list of the media */
    public $questionListUncompressed;
    public $results_disabled;
    public $expired_time;
    public $course;
    public $course_id;
    public $propagate_neg;
    public $saveCorrectAnswers;
    public $review_answers;
    public $randomByCat;
    public $text_when_finished;
    public $text_when_finished_failure;
    public $display_category_name;
    public $pass_percentage;
    public $edit_exercise_in_lp = false;
    public $is_gradebook_locked = false;
    public $exercise_was_added_in_lp = false;
    public $lpList = [];
    public $force_edit_exercise_in_lp = false;
    public $categories;
    public $categories_grouping = true;
    public $endButton = 0;
    public $categoryWithQuestionList;
    public $mediaList;
    public $loadQuestionAJAX = false;
    // Notification send to the teacher.
    public $emailNotificationTemplate = null;
    // Notification send to the student.
    public $emailNotificationTemplateToUser = null;
    public $countQuestions = 0;
    public $fastEdition = false;
    public $modelType = 1;
    public $questionSelectionType = EX_Q_SELECTION_ORDERED;
    public $hideQuestionTitle = 0;
    public $scoreTypeModel = 0;
    public $categoryMinusOne = true; // Shows the category -1: See BT#6540
    public $globalCategoryId = null;
    public $onSuccessMessage = null;
    public $onFailedMessage = null;
    public $emailAlert;
    public $notifyUserByEmail = '';
    public $sessionId = 0;
    public $questionFeedbackEnabled = false;
    public $questionTypeWithFeedback;
    public $showPreviousButton;
    public $notifications;
    public $export = false;
    public $autolaunch;
    public $exerciseCategoryId;
    public $pageResultConfiguration;
    public $hideQuestionNumber;
    public $preventBackwards;
    public $currentQuestion;
    public $hideComment;
    public $hideNoAnswer;
    public $hideExpectedAnswer;
    public $forceShowExpectedChoiceColumn;
    public $disableHideCorrectAnsweredQuestions;
    public $hideAttemptsTableOnStartPage;

    /**
     * Constructor of the class.
     *
     * @param int $courseId
     *
     * @author Olivier Brouckaert
     */
    public function __construct($courseId = 0)
    {
        $this->iid = 0;
        $this->exercise = '';
        $this->description = '';
        $this->sound = '';
        $this->type = ALL_ON_ONE_PAGE;
        $this->random = 0;
        $this->random_answers = 0;
        $this->active = 1;
        $this->questionList = [];
        $this->timeLimit = 0;
        $this->end_time = '';
        $this->start_time = '';
        $this->results_disabled = 1;
        $this->expired_time = 0;
        $this->propagate_neg = 0;
        $this->saveCorrectAnswers = 0;
        $this->review_answers = false;
        $this->randomByCat = 0;
        $this->text_when_finished = '';
        $this->text_when_finished_failure = '';
        $this->display_category_name = 0;
        $this->pass_percentage = 0;
        $this->modelType = 1;
        $this->questionSelectionType = EX_Q_SELECTION_ORDERED;
        $this->endButton = 0;
        $this->scoreTypeModel = 0;
        $this->globalCategoryId = null;
        $this->notifications = [];
        $this->exerciseCategoryId = null;
        $this->pageResultConfiguration;
        $this->hideQuestionNumber = 0;
        $this->preventBackwards = 0;
        $this->hideComment = false;
        $this->hideNoAnswer = false;
        $this->hideExpectedAnswer = false;
        $this->disableHideCorrectAnsweredQuestions = false;
        $this->hideAttemptsTableOnStartPage = 0;

        if (!empty($courseId)) {
            $courseInfo = api_get_course_info_by_id($courseId);
        } else {
            $courseInfo = api_get_course_info();
        }
        $this->course_id = $courseInfo['real_id'];
        $this->course = $courseInfo;
        $this->sessionId = api_get_session_id();

        // ALTER TABLE c_quiz_question ADD COLUMN feedback text;
        $this->questionFeedbackEnabled = api_get_configuration_value('allow_quiz_question_feedback');
        $this->showPreviousButton = true;
    }

    /**
     * Reads exercise information from the data base.
     *
     * @author Olivier Brouckaert
     *
     * @param int  $id                - exercise Id
     * @param bool $parseQuestionList
     *
     * @return bool - true if exercise exists, otherwise false
     */
    public function read($id, $parseQuestionList = true)
    {
        $table = Database::get_course_table(TABLE_QUIZ_TEST);

        $id = (int) $id;
        if (empty($this->course_id)) {
            return false;
        }

        $sql = "SELECT * FROM $table WHERE iid = ".$id;
        $result = Database::query($sql);

        // if the exercise has been found
        if ($object = Database::fetch_object($result)) {
            $this->iid = $object->iid;
            $this->exercise = $object->title;
            $this->name = $object->title;
            $this->title = $object->title;
            $this->description = $object->description;
            $this->sound = $object->sound;
            $this->type = $object->type;
            if (empty($this->type)) {
                $this->type = ONE_PER_PAGE;
            }
            $this->random = $object->random;
            $this->random_answers = $object->random_answers;
            $this->active = $object->active;
            $this->results_disabled = $object->results_disabled;
            $this->attempts = $object->max_attempt;
            $this->feedback_type = $object->feedback_type;
            $this->sessionId = $object->session_id;
            $this->propagate_neg = $object->propagate_neg;
            $this->saveCorrectAnswers = $object->save_correct_answers;
            $this->randomByCat = $object->random_by_category;
            $this->text_when_finished = $object->text_when_finished;
            $this->text_when_finished_failure = isset($object->text_when_finished_failure) ? $object->text_when_finished_failure : null;
            $this->display_category_name = $object->display_category_name;
            $this->pass_percentage = $object->pass_percentage;
            $this->is_gradebook_locked = api_resource_is_locked_by_gradebook($id, LINK_EXERCISE);
            $this->review_answers = (isset($object->review_answers) && $object->review_answers == 1) ? true : false;
            $this->globalCategoryId = isset($object->global_category_id) ? $object->global_category_id : null;
            $this->questionSelectionType = isset($object->question_selection_type) ? (int) $object->question_selection_type : null;
            $this->hideQuestionTitle = isset($object->hide_question_title) ? (int) $object->hide_question_title : 0;
            $this->autolaunch = isset($object->autolaunch) ? (int) $object->autolaunch : 0;
            $this->exerciseCategoryId = isset($object->exercise_category_id) ? (int) $object->exercise_category_id : null;
            $this->preventBackwards = isset($object->prevent_backwards) ? (int) $object->prevent_backwards : 0;
            $this->exercise_was_added_in_lp = false;
            $this->lpList = [];
            $this->notifications = [];
            if (!empty($object->notifications)) {
                $this->notifications = explode(',', $object->notifications);
            }

            if (!empty($object->page_result_configuration)) {
                $this->pageResultConfiguration = $object->page_result_configuration;
            }

            if (isset($object->hide_question_number)) {
                $this->hideQuestionNumber = $object->hide_question_number == 1;
            }

            if (isset($object->hide_attempts_table)) {
                $this->hideAttemptsTableOnStartPage = $object->hide_attempts_table == 1;
            }

            if (isset($object->show_previous_button)) {
                $this->showPreviousButton = $object->show_previous_button == 1;
            }

            $list = self::getLpListFromExercise($id, $this->course_id);
            if (!empty($list)) {
                $this->exercise_was_added_in_lp = true;
                $this->lpList = $list;
            }

            $this->force_edit_exercise_in_lp = api_get_configuration_value('force_edit_exercise_in_lp');
            $this->edit_exercise_in_lp = true;
            if ($this->exercise_was_added_in_lp) {
                $this->edit_exercise_in_lp = $this->force_edit_exercise_in_lp == true;
            }

            if (!empty($object->end_time)) {
                $this->end_time = $object->end_time;
            }
            if (!empty($object->start_time)) {
                $this->start_time = $object->start_time;
            }

            // Control time
            $this->expired_time = $object->expired_time;

            // Checking if question_order is correctly set
            if ($parseQuestionList) {
                $this->setQuestionList(true);
            }

            //overload questions list with recorded questions list
            //load questions only for exercises of type 'one question per page'
            //this is needed only is there is no questions

            // @todo not sure were in the code this is used somebody mess with the exercise tool
            // @todo don't know who add that config and why $_configuration['live_exercise_tracking']
            /*global $_configuration, $questionList;
            if ($this->type == ONE_PER_PAGE && $_SERVER['REQUEST_METHOD'] != 'POST'
                && defined('QUESTION_LIST_ALREADY_LOGGED') &&
                isset($_configuration['live_exercise_tracking']) && $_configuration['live_exercise_tracking']
            ) {
                $this->questionList = $questionList;
            }*/
            return true;
        }

        return false;
    }

    /**
     * @return string
     */
    public function getCutTitle()
    {
        $title = $this->getUnformattedTitle();

        return cut($title, EXERCISE_MAX_NAME_SIZE);
    }

    /**
     * returns the exercise ID.
     *
     * @author Olivier Brouckaert
     *
     * @return int - exercise ID
     */
    public function selectId()
    {
        return $this->iid;
    }

    /**
     * returns the exercise title.
     *
     * @author Olivier Brouckaert
     *
     * @param bool $unformattedText Optional. Get the title without HTML tags
     *
     * @return string - exercise title
     */
    public function selectTitle($unformattedText = false)
    {
        if ($unformattedText) {
            return $this->getUnformattedTitle();
        }

        return $this->exercise;
    }

    /**
     * Returns the maximum number of attempts set in the exercise configuration.
     *
     * @return int Maximum attempts allowed (0 if no limit)
     */
    public function selectAttempts()
    {
        return $this->attempts;
    }

    /**
     * Returns the number of FeedbackType
     *  0: Feedback , 1: DirectFeedback, 2: NoFeedback.
     *
     * @return int - exercise attempts
     */
    public function getFeedbackType()
    {
        return (int) $this->feedback_type;
    }

    /**
     * returns the time limit.
     *
     * @return int
     */
    public function selectTimeLimit()
    {
        return $this->timeLimit;
    }

    /**
     * returns the exercise description.
     *
     * @author Olivier Brouckaert
     *
     * @return string - exercise description
     */
    public function selectDescription()
    {
        return $this->description;
    }

    /**
     * returns the exercise sound file.
     *
     * @author Olivier Brouckaert
     *
     * @return string - exercise description
     */
    public function selectSound()
    {
        return $this->sound;
    }

    /**
     * returns the exercise type.
     *
     * @author Olivier Brouckaert
     *
     * @return int - exercise type
     */
    public function selectType()
    {
        return $this->type;
    }

    /**
     * @return int
     */
    public function getModelType()
    {
        return $this->modelType;
    }

    /**
     * @return int
     */
    public function selectEndButton()
    {
        return $this->endButton;
    }

    /**
     * @author hubert borderiou 30-11-11
     *
     * @return int : do we display the question category name for students
     */
    public function selectDisplayCategoryName()
    {
        return $this->display_category_name;
    }

    /**
     * @return int
     */
    public function selectPassPercentage()
    {
        return $this->pass_percentage;
    }

    /**
     * Modify object to update the switch display_category_name.
     *
     * @author hubert borderiou 30-11-11
     *
     * @param int $value is an integer 0 or 1
     */
    public function updateDisplayCategoryName($value)
    {
        $this->display_category_name = $value;
    }

    /**
     * @author hubert borderiou 28-11-11
     *
     * @return string html text : the text to display ay the end of the test
     */
    public function getTextWhenFinished()
    {
        return $this->text_when_finished;
    }

    /**
     * @param string $text
     *
     * @author hubert borderiou 28-11-11
     */
    public function updateTextWhenFinished($text)
    {
        $this->text_when_finished = $text;
    }

    /**
     * Get the text to display when the user has failed the test.
     *
     * @return string html text : the text to display ay the end of the test
     */
    public function getTextWhenFinishedFailure(): string
    {
        if (empty($this->text_when_finished_failure)) {
            return '';
        }

        return $this->text_when_finished_failure;
    }

    /**
     * Set the text to display when the user has succeeded in the test.
     */
    public function setTextWhenFinishedFailure(string $text): void
    {
        $this->text_when_finished_failure = $text;
    }

    /**
     * return 1 or 2 if randomByCat.
     *
     * @author hubert borderiou
     *
     * @return int - quiz random by category
     */
    public function getRandomByCategory()
    {
        return $this->randomByCat;
    }

    /**
     * return 0 if no random by cat
     * return 1 if random by cat, categories shuffled
     * return 2 if random by cat, categories sorted by alphabetic order.
     *
     * @author hubert borderiou
     *
     * @return int - quiz random by category
     */
    public function isRandomByCat()
    {
        $res = EXERCISE_CATEGORY_RANDOM_DISABLED;
        if ($this->randomByCat == EXERCISE_CATEGORY_RANDOM_SHUFFLED) {
            $res = EXERCISE_CATEGORY_RANDOM_SHUFFLED;
        } elseif ($this->randomByCat == EXERCISE_CATEGORY_RANDOM_ORDERED) {
            $res = EXERCISE_CATEGORY_RANDOM_ORDERED;
        }

        return $res;
    }

    /**
     * return nothing
     * update randomByCat value for object.
     *
     * @param int $random
     *
     * @author hubert borderiou
     */
    public function updateRandomByCat($random)
    {
        $this->randomByCat = EXERCISE_CATEGORY_RANDOM_DISABLED;
        if (in_array(
            $random,
            [
                EXERCISE_CATEGORY_RANDOM_SHUFFLED,
                EXERCISE_CATEGORY_RANDOM_ORDERED,
                EXERCISE_CATEGORY_RANDOM_DISABLED,
            ]
        )) {
            $this->randomByCat = $random;
        }
    }

    /**
     * Tells if questions are selected randomly, and if so returns the draws.
     *
     * @author Carlos Vargas
     *
     * @return int - results disabled exercise
     */
    public function selectResultsDisabled()
    {
        return $this->results_disabled;
    }

    /**
     * tells if questions are selected randomly, and if so returns the draws.
     *
     * @author Olivier Brouckaert
     *
     * @return bool
     */
    public function isRandom()
    {
        $isRandom = false;
        // "-1" means all questions will be random
        if ($this->random > 0 || $this->random == -1) {
            $isRandom = true;
        }

        return $isRandom;
    }

    /**
     * returns random answers status.
     *
     * @author Juan Carlos Rana
     */
    public function getRandomAnswers()
    {
        return $this->random_answers;
    }

    /**
     * Same as isRandom() but has a name applied to values different than 0 or 1.
     *
     * @return int
     */
    public function getShuffle()
    {
        return $this->random;
    }

    /**
     * returns the exercise status (1 = enabled ; 0 = disabled).
     *
     * @author Olivier Brouckaert
     *
     * @return int - 1 if enabled, otherwise 0
     */
    public function selectStatus()
    {
        return $this->active;
    }

    /**
     * If false the question list will be managed as always if true
     * the question will be filtered
     * depending of the exercise settings (table c_quiz_rel_category).
     *
     * @param bool $status active or inactive grouping
     */
    public function setCategoriesGrouping($status)
    {
        $this->categories_grouping = (bool) $status;
    }

    /**
     * @return int
     */
    public function getHideQuestionTitle()
    {
        return $this->hideQuestionTitle;
    }

    /**
     * @param $value
     */
    public function setHideQuestionTitle($value)
    {
        $this->hideQuestionTitle = (int) $value;
    }

    /**
     * @return int
     */
    public function getScoreTypeModel()
    {
        return $this->scoreTypeModel;
    }

    /**
     * @param int $value
     */
    public function setScoreTypeModel($value)
    {
        $this->scoreTypeModel = (int) $value;
    }

    /**
     * @return int
     */
    public function getGlobalCategoryId()
    {
        return $this->globalCategoryId;
    }

    /**
     * @param int $value
     */
    public function setGlobalCategoryId($value)
    {
        if (is_array($value) && isset($value[0])) {
            $value = $value[0];
        }
        $this->globalCategoryId = (int) $value;
    }

    /**
     * @param int    $start
     * @param int    $limit
     * @param int    $sidx
     * @param string $sord
     * @param array  $whereCondition
     * @param array  $extraFields
     *
     * @return array
     */
    public function getQuestionListPagination(
        $start,
        $limit,
        $sidx,
        $sord,
        $whereCondition = [],
        $extraFields = []
    ) {
        if (!empty($this->iid)) {
            $category_list = TestCategory::getListOfCategoriesNameForTest(
                $this->iid,
                false
            );
            $TBL_EXERCICE_QUESTION = Database::get_course_table(TABLE_QUIZ_TEST_QUESTION);
            $TBL_QUESTIONS = Database::get_course_table(TABLE_QUIZ_QUESTION);

            $sql = "SELECT q.iid
                    FROM $TBL_EXERCICE_QUESTION e
                    INNER JOIN $TBL_QUESTIONS  q ON e.question_id = q.iid
					WHERE e.exercice_id	= ".$this->iid." AND e.c_id = {$this->course_id}";

            $orderCondition = ' ORDER BY question_order ';

            if (!empty($sidx) && !empty($sord)) {
                if ('question' === $sidx) {
                    if (in_array(strtolower($sord), ['desc', 'asc'])) {
                        $orderCondition = " ORDER BY q.question $sord";
                    }
                }
            }

            $sql .= $orderCondition;
            $limitCondition = null;
            if (isset($start) && isset($limit)) {
                $start = (int) $start;
                $limit = (int) $limit;
                $limitCondition = " LIMIT $start, $limit";
            }
            $sql .= $limitCondition;
            $result = Database::query($sql);
            $questions = [];
            if (Database::num_rows($result)) {
                if (!empty($extraFields)) {
                    $extraFieldValue = new ExtraFieldValue('question');
                }
                while ($question = Database::fetch_array($result, 'ASSOC')) {
                    /** @var Question $objQuestionTmp */
                    $objQuestionTmp = Question::read($question['iid']);
                    $category_labels = TestCategory::return_category_labels(
                        $objQuestionTmp->category_list,
                        $category_list
                    );

                    if (empty($category_labels)) {
                        $category_labels = '-';
                    }

                    // Question type
                    $typeImg = $objQuestionTmp->getTypePicture();
                    $typeExpl = $objQuestionTmp->getExplanation();

                    $question_media = null;
                    if (!empty($objQuestionTmp->parent_id)) {
                        $objQuestionMedia = Question::read($objQuestionTmp->parent_id);
                        $question_media = Question::getMediaLabel($objQuestionMedia->question);
                    }

                    $questionType = Display::tag(
                        'div',
                        Display::return_icon($typeImg, $typeExpl, [], ICON_SIZE_MEDIUM).$question_media
                    );

                    $question = [
                        'iid' => $question['iid'],
                        'question' => $objQuestionTmp->selectTitle(),
                        'type' => $questionType,
                        'category' => Display::tag(
                            'div',
                            '<a href="#" style="padding:0px; margin:0px;">'.$category_labels.'</a>'
                        ),
                        'score' => $objQuestionTmp->selectWeighting(),
                        'level' => $objQuestionTmp->level,
                    ];

                    if (!empty($extraFields)) {
                        foreach ($extraFields as $extraField) {
                            $value = $extraFieldValue->get_values_by_handler_and_field_id(
                                $question['iid'],
                                $extraField['id']
                            );
                            $stringValue = null;
                            if ($value) {
                                $stringValue = $value['field_value'];
                            }
                            $question[$extraField['field_variable']] = $stringValue;
                        }
                    }
                    $questions[] = $question;
                }
            }

            return $questions;
        }
    }

    /**
     * Get question count per exercise from DB (any special treatment).
     *
     * @return int
     */
    public function getQuestionCount()
    {
        $TBL_EXERCICE_QUESTION = Database::get_course_table(TABLE_QUIZ_TEST_QUESTION);
        $TBL_QUESTIONS = Database::get_course_table(TABLE_QUIZ_QUESTION);
        $sql = "SELECT count(q.iid) as count
                FROM $TBL_EXERCICE_QUESTION e
                INNER JOIN $TBL_QUESTIONS q
                ON e.question_id = q.iid
                WHERE
                    e.c_id = {$this->course_id} AND
                    e.exercice_id = {$this->iid}";
        $result = Database::query($sql);

        $count = 0;
        if (Database::num_rows($result)) {
            $row = Database::fetch_array($result);
            $count = (int) $row['count'];
        }

        return $count;
    }

    /**
     * @return array
     */
    public function getQuestionOrderedListByName()
    {
        if (empty($this->course_id) || empty($this->iid)) {
            return [];
        }

        $exerciseQuestionTable = Database::get_course_table(TABLE_QUIZ_TEST_QUESTION);
        $questionTable = Database::get_course_table(TABLE_QUIZ_QUESTION);

        // Getting question list from the order (question list drag n drop interface ).
        $sql = "SELECT e.question_id
                FROM $exerciseQuestionTable e
                INNER JOIN $questionTable q
                ON e.question_id= q.iid
                WHERE
                    e.c_id = {$this->course_id} AND
                    e.exercice_id = {$this->iid}
                ORDER BY q.question";
        $result = Database::query($sql);
        $list = [];
        if (Database::num_rows($result)) {
            $list = Database::store_result($result, 'ASSOC');
        }

        return $list;
    }

    /**
     * Selecting question list depending in the exercise-category
     * relationship (category table in exercise settings).
     *
     * @param array $question_list
     * @param int   $questionSelectionType
     *
     * @return array
     */
    public function getQuestionListWithCategoryListFilteredByCategorySettings(
        $question_list,
        $questionSelectionType
    ) {
        $result = [
            'question_list' => [],
            'category_with_questions_list' => [],
        ];

        // Order/random categories
        $cat = new TestCategory();
        // Setting category order.
        switch ($questionSelectionType) {
            case EX_Q_SELECTION_ORDERED: // 1
            case EX_Q_SELECTION_RANDOM:  // 2
                // This options are not allowed here.
                break;
            case EX_Q_SELECTION_CATEGORIES_ORDERED_QUESTIONS_ORDERED: // 3
                $categoriesAddedInExercise = $cat->getCategoryExerciseTree(
                    $this,
                    $this->course['real_id'],
                    'title ASC',
                    false,
                    true
                );

                $questions_by_category = TestCategory::getQuestionsByCat(
                    $this->iid,
                    $question_list,
                    $categoriesAddedInExercise
                );

                $question_list = $this->pickQuestionsPerCategory(
                    $categoriesAddedInExercise,
                    $question_list,
                    $questions_by_category,
                    true,
                    false
                );
                break;
            case EX_Q_SELECTION_CATEGORIES_RANDOM_QUESTIONS_ORDERED: // 4
            case EX_Q_SELECTION_CATEGORIES_RANDOM_QUESTIONS_ORDERED_NO_GROUPED: // 7
                $categoriesAddedInExercise = $cat->getCategoryExerciseTree(
                    $this,
                    $this->course['real_id'],
                    null,
                    true,
                    true
                );
                $questions_by_category = TestCategory::getQuestionsByCat(
                    $this->iid,
                    $question_list,
                    $categoriesAddedInExercise
                );
                $question_list = $this->pickQuestionsPerCategory(
                    $categoriesAddedInExercise,
                    $question_list,
                    $questions_by_category,
                    true,
                    false
                );
                break;
            case EX_Q_SELECTION_CATEGORIES_ORDERED_QUESTIONS_RANDOM: // 5
                $categoriesAddedInExercise = $cat->getCategoryExerciseTree(
                    $this,
                    $this->course['real_id'],
                    'title ASC',
                    false,
                    true
                );
                $questions_by_category = TestCategory::getQuestionsByCat(
                    $this->iid,
                    $question_list,
                    $categoriesAddedInExercise
                );

                $questionsByCategoryMandatory = [];
                if (EX_Q_SELECTION_CATEGORIES_ORDERED_QUESTIONS_RANDOM == $this->getQuestionSelectionType() &&
                    api_get_configuration_value('allow_mandatory_question_in_category')
                ) {
                    $questionsByCategoryMandatory = TestCategory::getQuestionsByCat(
                        $this->iid,
                        $question_list,
                        $categoriesAddedInExercise,
                        true
                    );
                }

                $question_list = $this->pickQuestionsPerCategory(
                    $categoriesAddedInExercise,
                    $question_list,
                    $questions_by_category,
                    true,
                    true,
                    $questionsByCategoryMandatory
                );
                break;
            case EX_Q_SELECTION_CATEGORIES_RANDOM_QUESTIONS_RANDOM: // 6
            case EX_Q_SELECTION_CATEGORIES_RANDOM_QUESTIONS_RANDOM_NO_GROUPED:
                $categoriesAddedInExercise = $cat->getCategoryExerciseTree(
                    $this,
                    $this->course['real_id'],
                    null,
                    true,
                    true
                );

                $questions_by_category = TestCategory::getQuestionsByCat(
                    $this->iid,
                    $question_list,
                    $categoriesAddedInExercise
                );

                $question_list = $this->pickQuestionsPerCategory(
                    $categoriesAddedInExercise,
                    $question_list,
                    $questions_by_category,
                    true,
                    true
                );
                break;
            case EX_Q_SELECTION_CATEGORIES_RANDOM_QUESTIONS_ORDERED_NO_GROUPED: // 7
                break;
            case EX_Q_SELECTION_CATEGORIES_RANDOM_QUESTIONS_RANDOM_NO_GROUPED: // 8
                break;
            case EX_Q_SELECTION_CATEGORIES_ORDERED_BY_PARENT_QUESTIONS_ORDERED: // 9
                $categoriesAddedInExercise = $cat->getCategoryExerciseTree(
                    $this,
                    $this->course['real_id'],
                    'root ASC, lft ASC',
                    false,
                    true
                );
                $questions_by_category = TestCategory::getQuestionsByCat(
                    $this->iid,
                    $question_list,
                    $categoriesAddedInExercise
                );
                $question_list = $this->pickQuestionsPerCategory(
                    $categoriesAddedInExercise,
                    $question_list,
                    $questions_by_category,
                    true,
                    false
                );
                break;
            case EX_Q_SELECTION_CATEGORIES_ORDERED_BY_PARENT_QUESTIONS_RANDOM: // 10
                $categoriesAddedInExercise = $cat->getCategoryExerciseTree(
                    $this,
                    $this->course['real_id'],
                    'root, lft ASC',
                    false,
                    true
                );
                $questions_by_category = TestCategory::getQuestionsByCat(
                    $this->iid,
                    $question_list,
                    $categoriesAddedInExercise
                );
                $question_list = $this->pickQuestionsPerCategory(
                    $categoriesAddedInExercise,
                    $question_list,
                    $questions_by_category,
                    true,
                    true
                );
                break;
        }

        $result['question_list'] = isset($question_list) ? $question_list : [];
        $result['category_with_questions_list'] = isset($questions_by_category) ? $questions_by_category : [];
        $parentsLoaded = [];
        // Adding category info in the category list with question list:
        if (!empty($questions_by_category)) {
            $newCategoryList = [];
            $em = Database::getManager();
            $repo = $em->getRepository('ChamiloCourseBundle:CQuizCategory');

            foreach ($questions_by_category as $categoryId => $questionList) {
                $cat = new TestCategory();
                $cat = $cat->getCategory($categoryId);
                if ($cat) {
                    $cat = (array) $cat;
                }

                $categoryParentInfo = null;
                // Parent is not set no loop here
                if (isset($cat['parent_id']) && !empty($cat['parent_id'])) {
                    /** @var \Chamilo\CourseBundle\Entity\CQuizCategory $categoryEntity */
                    if (!isset($parentsLoaded[$cat['parent_id']])) {
                        $categoryEntity = $em->find('ChamiloCourseBundle:CQuizCategory', $cat['parent_id']);
                        $parentsLoaded[$cat['parent_id']] = $categoryEntity;
                    } else {
                        $categoryEntity = $parentsLoaded[$cat['parent_id']];
                    }
                    $path = $repo->getPath($categoryEntity);

                    $index = 0;
                    if ($this->categoryMinusOne) {
                        //$index = 1;
                    }

                    /** @var \Chamilo\CourseBundle\Entity\CQuizCategory $categoryParent */
                    foreach ($path as $categoryParent) {
                        $visibility = $categoryParent->getVisibility();
                        if (0 == $visibility) {
                            $categoryParentId = $categoryId;
                            $categoryTitle = $cat['title'];
                            if (count($path) > 1) {
                                continue;
                            }
                        } else {
                            $categoryParentId = $categoryParent->getIid();
                            $categoryTitle = $categoryParent->getTitle();
                        }

                        $categoryParentInfo['id'] = $categoryParentId;
                        $categoryParentInfo['iid'] = $categoryParentId;
                        $categoryParentInfo['parent_path'] = null;
                        $categoryParentInfo['title'] = $categoryTitle;
                        $categoryParentInfo['name'] = $categoryTitle;
                        $categoryParentInfo['parent_id'] = null;
                        break;
                    }
                }
                $cat['parent_info'] = $categoryParentInfo;
                $newCategoryList[$categoryId] = [
                    'category' => $cat,
                    'question_list' => $questionList,
                ];
            }

            $result['category_with_questions_list'] = $newCategoryList;
        }

        return $result;
    }

    /**
     * returns the array with the question ID list.
     *
     * @param bool $fromDatabase Whether the results should be fetched in the database or just from memory
     * @param bool $adminView    Whether we should return all questions (admin view) or
     *                           just a list limited by the max number of random questions
     *
     * @author Olivier Brouckaert
     *
     * @return array - question ID list
     */
    public function selectQuestionList($fromDatabase = false, $adminView = false)
    {
        if ($fromDatabase && !empty($this->iid)) {
            $nbQuestions = $this->getQuestionCount();
            $questionSelectionType = $this->getQuestionSelectionType();

            switch ($questionSelectionType) {
                case EX_Q_SELECTION_ORDERED:
                    $questionList = $this->getQuestionOrderedList($adminView);
                    break;
                case EX_Q_SELECTION_RANDOM:
                    // Not a random exercise, or if there are not at least 2 questions
                    if ($this->random == 0 || $nbQuestions < 2) {
                        $questionList = $this->getQuestionOrderedList($adminView);
                    } else {
                        $questionList = $this->getRandomList($adminView);
                    }
                    break;
                default:
                    $questionList = $this->getQuestionOrderedList($adminView);
                    $result = $this->getQuestionListWithCategoryListFilteredByCategorySettings(
                        $questionList,
                        $questionSelectionType
                    );
                    $this->categoryWithQuestionList = $result['category_with_questions_list'];
                    $questionList = $result['question_list'];
                    break;
            }

            return $questionList;
        }

        return $this->questionList;
    }

    /**
     * returns the number of questions in this exercise.
     *
     * @author Olivier Brouckaert
     *
     * @return int - number of questions
     */
    public function selectNbrQuestions()
    {
        return count($this->questionList);
    }

    /**
     * @return int
     */
    public function selectPropagateNeg()
    {
        return $this->propagate_neg;
    }

    /**
     * @return int
     */
    public function getSaveCorrectAnswers()
    {
        return $this->saveCorrectAnswers;
    }

    /**
     * Selects questions randomly in the question list.
     *
     * @author Olivier Brouckaert
     * @author Hubert Borderiou 15 nov 2011
     *
     * @param bool $adminView Whether we should return all
     *                        questions (admin view) or just a list limited by the max number of random questions
     *
     * @return array - if the exercise is not set to take questions randomly, returns the question list
     *               without randomizing, otherwise, returns the list with questions selected randomly
     */
    public function getRandomList($adminView = false)
    {
        $quizRelQuestion = Database::get_course_table(TABLE_QUIZ_TEST_QUESTION);
        $question = Database::get_course_table(TABLE_QUIZ_QUESTION);
        $random = isset($this->random) && !empty($this->random) ? $this->random : 0;

        // Random with limit
        $randomLimit = " ORDER BY RAND() LIMIT $random";

        // Random with no limit
        if (-1 == $random) {
            $randomLimit = ' ORDER BY RAND() ';
        }

        // Admin see the list in default order
        if (true === $adminView) {
            // If viewing it as admin for edition, don't show it randomly, use title + id
            $randomLimit = 'ORDER BY e.question_order';
        }

        $sql = "SELECT e.question_id
                FROM $quizRelQuestion e
                INNER JOIN $question q
                ON e.question_id= q.iid
                WHERE
                    e.c_id = {$this->course_id} AND
                    e.exercice_id = '".Database::escape_string($this->iid)."'
                    $randomLimit ";
        $result = Database::query($sql);
        $questionList = [];
        while ($row = Database::fetch_object($result)) {
            $questionList[] = $row->question_id;
        }

        return $questionList;
    }

    /**
     * returns 'true' if the question ID is in the question list.
     *
     * @author Olivier Brouckaert
     *
     * @param int $questionId - question ID
     *
     * @return bool - true if in the list, otherwise false
     */
    public function isInList($questionId)
    {
        $inList = false;
        if (is_array($this->questionList)) {
            $inList = in_array($questionId, $this->questionList);
        }

        return $inList;
    }

    /**
     * If current exercise has a question.
     *
     * @param int $questionId
     *
     * @return int
     */
    public function hasQuestion($questionId)
    {
        $questionId = (int) $questionId;

        $TBL_EXERCICE_QUESTION = Database::get_course_table(TABLE_QUIZ_TEST_QUESTION);
        $TBL_QUESTIONS = Database::get_course_table(TABLE_QUIZ_QUESTION);
        $sql = "SELECT q.iid
                FROM $TBL_EXERCICE_QUESTION e
                INNER JOIN $TBL_QUESTIONS q
                ON e.question_id = q.iid
                WHERE
                    q.iid = $questionId AND
                    e.c_id = {$this->course_id} AND
                    e.exercice_id = ".$this->iid;

        $result = Database::query($sql);

        return Database::num_rows($result) > 0;
    }

    public function hasQuestionWithType($type)
    {
        $type = (int) $type;

        $table = Database::get_course_table(TABLE_QUIZ_TEST_QUESTION);
        $tableQuestion = Database::get_course_table(TABLE_QUIZ_QUESTION);
        $sql = "SELECT q.iid
                FROM $table e
                INNER JOIN $tableQuestion q
                ON e.question_id = q.iid
                WHERE
                    q.type = $type AND
                    e.c_id = {$this->course_id} AND
                    e.exercice_id = ".$this->iid;

        $result = Database::query($sql);

        return Database::num_rows($result) > 0;
    }

    public function hasQuestionWithTypeNotInList(array $questionTypeList)
    {
        if (empty($questionTypeList)) {
            return false;
        }

        $questionTypeToString = implode("','", array_map('intval', $questionTypeList));

        $table = Database::get_course_table(TABLE_QUIZ_TEST_QUESTION);
        $tableQuestion = Database::get_course_table(TABLE_QUIZ_QUESTION);
        $sql = "SELECT q.iid
                FROM $table e
                INNER JOIN $tableQuestion q
                ON e.question_id = q.iid
                WHERE
                    q.type NOT IN ('$questionTypeToString')  AND
                    e.c_id = {$this->course_id} AND
                    e.exercice_id = ".$this->iid;

        $result = Database::query($sql);

        return Database::num_rows($result) > 0;
    }

    /**
     * changes the exercise title.
     *
     * @author Olivier Brouckaert
     *
     * @param string $title - exercise title
     */
    public function updateTitle($title)
    {
        $this->title = $this->exercise = $title;
    }

    /**
     * changes the exercise max attempts.
     *
     * @param int $attempts - exercise max attempts
     */
    public function updateAttempts($attempts)
    {
        $this->attempts = $attempts;
    }

    /**
     * changes the exercise feedback type.
     *
     * @param int $feedback_type
     */
    public function updateFeedbackType($feedback_type)
    {
        $this->feedback_type = $feedback_type;
    }

    /**
     * changes the exercise description.
     *
     * @author Olivier Brouckaert
     *
     * @param string $description - exercise description
     */
    public function updateDescription($description)
    {
        $this->description = $description;
    }

    /**
     * changes the exercise expired_time.
     *
     * @author Isaac flores
     *
     * @param int $expired_time The expired time of the quiz
     */
    public function updateExpiredTime($expired_time)
    {
        $this->expired_time = $expired_time;
    }

    /**
     * @param $value
     */
    public function updatePropagateNegative($value)
    {
        $this->propagate_neg = $value;
    }

    /**
     * @param int $value
     */
    public function updateSaveCorrectAnswers($value)
    {
        $this->saveCorrectAnswers = (int) $value;
    }

    /**
     * @param $value
     */
    public function updateReviewAnswers($value)
    {
        $this->review_answers = isset($value) && $value ? true : false;
    }

    /**
     * @param $value
     */
    public function updatePassPercentage($value)
    {
        $this->pass_percentage = $value;
    }

    /**
     * @param string $text
     */
    public function updateEmailNotificationTemplate($text)
    {
        $this->emailNotificationTemplate = $text;
    }

    /**
     * @param string $text
     */
    public function setEmailNotificationTemplateToUser($text)
    {
        $this->emailNotificationTemplateToUser = $text;
    }

    /**
     * @param string $value
     */
    public function setNotifyUserByEmail($value)
    {
        $this->notifyUserByEmail = $value;
    }

    /**
     * @param int $value
     */
    public function updateEndButton($value)
    {
        $this->endButton = (int) $value;
    }

    /**
     * @param string $value
     */
    public function setOnSuccessMessage($value)
    {
        $this->onSuccessMessage = $value;
    }

    /**
     * @param string $value
     */
    public function setOnFailedMessage($value)
    {
        $this->onFailedMessage = $value;
    }

    /**
     * @param $value
     */
    public function setModelType($value)
    {
        $this->modelType = (int) $value;
    }

    /**
     * @param int $value
     */
    public function setQuestionSelectionType($value)
    {
        $this->questionSelectionType = (int) $value;
    }

    /**
     * @return int
     */
    public function getQuestionSelectionType()
    {
        return (int) $this->questionSelectionType;
    }

    /**
     * @param array $categories
     */
    public function updateCategories($categories)
    {
        if (!empty($categories)) {
            $categories = array_map('intval', $categories);
            $this->categories = $categories;
        }
    }

    /**
     * changes the exercise sound file.
     *
     * @author Olivier Brouckaert
     *
     * @param string $sound  - exercise sound file
     * @param string $delete - ask to delete the file
     */
    public function updateSound($sound, $delete)
    {
        global $audioPath, $documentPath;
        $TBL_DOCUMENT = Database::get_course_table(TABLE_DOCUMENT);

        if ($sound['size'] && (strstr($sound['type'], 'audio') || strstr($sound['type'], 'video'))) {
            $this->sound = $sound['name'];

            if (@move_uploaded_file($sound['tmp_name'], $audioPath.'/'.$this->sound)) {
                $sql = "SELECT 1 FROM $TBL_DOCUMENT
                        WHERE
                            c_id = ".$this->course_id." AND
                            path = '".str_replace($documentPath, '', $audioPath).'/'.$this->sound."'";
                $result = Database::query($sql);

                if (!Database::num_rows($result)) {
                    $id = add_document(
                        $this->course,
                        str_replace($documentPath, '', $audioPath).'/'.$this->sound,
                        'file',
                        $sound['size'],
                        $sound['name']
                    );
                    api_item_property_update(
                        $this->course,
                        TOOL_DOCUMENT,
                        $id,
                        'DocumentAdded',
                        api_get_user_id()
                    );
                    item_property_update_on_folder(
                        $this->course,
                        str_replace($documentPath, '', $audioPath),
                        api_get_user_id()
                    );
                }
            }
        } elseif ($delete && is_file($audioPath.'/'.$this->sound)) {
            $this->sound = '';
        }
    }

    /**
     * changes the exercise type.
     *
     * @author Olivier Brouckaert
     *
     * @param int $type - exercise type
     */
    public function updateType($type)
    {
        $this->type = $type;
    }

    /**
     * sets to 0 if questions are not selected randomly
     * if questions are selected randomly, sets the draws.
     *
     * @author Olivier Brouckaert
     *
     * @param int $random - 0 if not random, otherwise the draws
     */
    public function setRandom($random)
    {
        $this->random = $random;
    }

    /**
     * sets to 0 if answers are not selected randomly
     * if answers are selected randomly.
     *
     * @author Juan Carlos Rana
     *
     * @param int $random_answers - random answers
     */
    public function updateRandomAnswers($random_answers)
    {
        $this->random_answers = $random_answers;
    }

    /**
     * enables the exercise.
     *
     * @author Olivier Brouckaert
     */
    public function enable()
    {
        $this->active = 1;
    }

    /**
     * disables the exercise.
     *
     * @author Olivier Brouckaert
     */
    public function disable()
    {
        $this->active = 0;
    }

    /**
     * Set disable results.
     */
    public function disable_results()
    {
        $this->results_disabled = true;
    }

    /**
     * Enable results.
     */
    public function enable_results()
    {
        $this->results_disabled = false;
    }

    /**
     * @param int $results_disabled
     */
    public function updateResultsDisabled($results_disabled)
    {
        $this->results_disabled = (int) $results_disabled;
    }

    /**
     * updates the exercise in the data base.
     *
     * @param string $type_e
     *
     * @author Olivier Brouckaert
     */
    public function save($type_e = '')
    {
        $_course = $this->course;
        $TBL_EXERCISES = Database::get_course_table(TABLE_QUIZ_TEST);

        $id = $this->iid;
        $exercise = $this->exercise;
        $description = $this->description;
        $sound = $this->sound;
        $type = $this->type;
        $attempts = isset($this->attempts) ? $this->attempts : 0;
        $feedback_type = isset($this->feedback_type) ? $this->feedback_type : 0;
        $random = $this->random;
        $random_answers = $this->random_answers;
        $active = $this->active;
        $propagate_neg = (int) $this->propagate_neg;
        $saveCorrectAnswers = isset($this->saveCorrectAnswers) ? (int) $this->saveCorrectAnswers : 0;
        $review_answers = isset($this->review_answers) && $this->review_answers ? 1 : 0;
        $randomByCat = (int) $this->randomByCat;
        $text_when_finished = $this->text_when_finished;
        $text_when_finished_failure = $this->text_when_finished_failure;
        $display_category_name = (int) $this->display_category_name;
        $pass_percentage = (int) $this->pass_percentage;
        $session_id = $this->sessionId;

        // If direct we do not show results
        $results_disabled = (int) $this->results_disabled;
        if (in_array($feedback_type, [EXERCISE_FEEDBACK_TYPE_DIRECT, EXERCISE_FEEDBACK_TYPE_POPUP])) {
            $results_disabled = 0;
        }
        $expired_time = (int) $this->expired_time;
        $showHideConfiguration = api_get_configuration_value('quiz_hide_question_number');

        // Exercise already exists
        if ($id) {
            // we prepare date in the database using the api_get_utc_datetime() function
            $start_time = null;
            if (!empty($this->start_time)) {
                $start_time = $this->start_time;
            }

            $end_time = null;
            if (!empty($this->end_time)) {
                $end_time = $this->end_time;
            }

            $params = [
                'title' => $exercise,
                'description' => $description,
            ];

            $paramsExtra = [];
            if ($type_e != 'simple') {
                $paramsExtra = [
                    'sound' => $sound,
                    'type' => $type,
                    'random' => $random,
                    'random_answers' => $random_answers,
                    'active' => $active,
                    'feedback_type' => $feedback_type,
                    'start_time' => $start_time,
                    'end_time' => $end_time,
                    'max_attempt' => $attempts,
                    'expired_time' => $expired_time,
                    'propagate_neg' => $propagate_neg,
                    'save_correct_answers' => $saveCorrectAnswers,
                    'review_answers' => $review_answers,
                    'random_by_category' => $randomByCat,
                    'text_when_finished' => $text_when_finished,
                    'display_category_name' => $display_category_name,
                    'pass_percentage' => $pass_percentage,
                    'results_disabled' => $results_disabled,
                    'question_selection_type' => $this->getQuestionSelectionType(),
                    'hide_question_title' => $this->getHideQuestionTitle(),
                ];

                if (true === api_get_configuration_value('exercise_text_when_finished_failure')) {
                    $paramsExtra['text_when_finished_failure'] = $text_when_finished_failure;
                }

                $allow = api_get_configuration_value('allow_quiz_show_previous_button_setting');
                if ($allow === true) {
                    $paramsExtra['show_previous_button'] = $this->showPreviousButton();
                }

                if (api_get_configuration_value('quiz_prevent_backwards_move')) {
                    $paramsExtra['prevent_backwards'] = $this->getPreventBackwards();
                }

                $allow = api_get_configuration_value('allow_exercise_categories');
                if ($allow === true) {
                    if (!empty($this->getExerciseCategoryId())) {
                        $paramsExtra['exercise_category_id'] = $this->getExerciseCategoryId();
                    }
                }

                $allow = api_get_configuration_value('allow_notification_setting_per_exercise');
                if ($allow === true) {
                    $notifications = $this->getNotifications();
                    $notifications = implode(',', $notifications);
                    $paramsExtra['notifications'] = $notifications;
                }

                $pageConfig = api_get_configuration_value('allow_quiz_results_page_config');
                if ($pageConfig && !empty($this->pageResultConfiguration)) {
                    $paramsExtra['page_result_configuration'] = $this->pageResultConfiguration;
                }
            }

            if ($showHideConfiguration) {
                $paramsExtra['hide_question_number'] = $this->hideQuestionNumber;
            }
            if (true === api_get_configuration_value('quiz_hide_attempts_table_on_start_page')) {
                $paramsExtra['hide_attempts_table'] = $this->getHideAttemptsTableOnStartPage();
            }

            $params = array_merge($params, $paramsExtra);

            Database::update(
                $TBL_EXERCISES,
                $params,
                ['c_id = ? AND iid = ?' => [$this->course_id, $id]]
            );

            // update into the item_property table
            api_item_property_update(
                $_course,
                TOOL_QUIZ,
                $id,
                'QuizUpdated',
                api_get_user_id()
            );

            if (api_get_setting('search_enabled') === 'true') {
                $this->search_engine_edit();
            }
            Event::addEvent(
                LOG_EXERCISE_UPDATE,
                LOG_EXERCISE_ID,
                $id
            );
        } else {
            // Creates a new exercise
            // In this case of new exercise, we don't do the api_get_utc_datetime()
            // for date because, bellow, we call function api_set_default_visibility()
            // In this function, api_set_default_visibility,
            // the Quiz is saved too, with an $id and api_get_utc_datetime() is done.
            // If we do it now, it will be done twice (cf. https://support.chamilo.org/issues/6586)
            $start_time = null;
            if (!empty($this->start_time)) {
                $start_time = $this->start_time;
            }

            $end_time = null;
            if (!empty($this->end_time)) {
                $end_time = $this->end_time;
            }

            $params = [
                'c_id' => $this->course_id,
                'start_time' => $start_time,
                'end_time' => $end_time,
                'title' => $exercise,
                'description' => $description,
                'sound' => $sound,
                'type' => $type,
                'random' => $random,
                'random_answers' => $random_answers,
                'active' => $active,
                'results_disabled' => $results_disabled,
                'max_attempt' => $attempts,
                'feedback_type' => $feedback_type,
                'expired_time' => $expired_time,
                'session_id' => $session_id,
                'review_answers' => $review_answers,
                'random_by_category' => $randomByCat,
                'text_when_finished' => $text_when_finished,
                'display_category_name' => $display_category_name,
                'pass_percentage' => $pass_percentage,
                'save_correct_answers' => $saveCorrectAnswers,
                'propagate_neg' => $propagate_neg,
                'hide_question_title' => $this->getHideQuestionTitle(),
            ];

            if (true === api_get_configuration_value('exercise_text_when_finished_failure')) {
                $params['text_when_finished_failure'] = $text_when_finished_failure;
            }

            $allow = api_get_configuration_value('allow_exercise_categories');
            if (true === $allow) {
                if (!empty($this->getExerciseCategoryId())) {
                    $params['exercise_category_id'] = $this->getExerciseCategoryId();
                }
            }

            if (api_get_configuration_value('quiz_prevent_backwards_move')) {
                $params['prevent_backwards'] = $this->getPreventBackwards();
            }

            $allow = api_get_configuration_value('allow_quiz_show_previous_button_setting');
            if (true === $allow) {
                $params['show_previous_button'] = $this->showPreviousButton();
            }

            $allow = api_get_configuration_value('allow_notification_setting_per_exercise');
            if (true === $allow) {
                $notifications = $this->getNotifications();
                $params['notifications'] = '';
                if (!empty($notifications)) {
                    $notifications = implode(',', $notifications);
                    $params['notifications'] = $notifications;
                }
            }

            $pageConfig = api_get_configuration_value('allow_quiz_results_page_config');
            if ($pageConfig && !empty($this->pageResultConfiguration)) {
                $params['page_result_configuration'] = $this->pageResultConfiguration;
            }
            if ($showHideConfiguration) {
                $params['hide_question_number'] = $this->hideQuestionNumber;
            }

            $this->iid = Database::insert($TBL_EXERCISES, $params);

            if ($this->iid) {
                $sql = "UPDATE $TBL_EXERCISES
                        SET question_selection_type= ".$this->getQuestionSelectionType()."
                        WHERE iid = ".$this->iid;
                Database::query($sql);

                // insert into the item_property table
                api_item_property_update(
                    $this->course,
                    TOOL_QUIZ,
                    $this->iid,
                    'QuizAdded',
                    api_get_user_id()
                );

                // This function save the quiz again, carefull about start_time
                // and end_time if you remove this line (see above)
                api_set_default_visibility(
                    $this->iid,
                    TOOL_QUIZ,
                    null,
                    $this->course
                );

                if (api_get_setting('search_enabled') === 'true' && extension_loaded('xapian')) {
                    $this->search_engine_save();
                }
                Event::addEvent(
                    LOG_EXERCISE_CREATE,
                    LOG_EXERCISE_ID,
                    $this->iid
                );
            }
        }

        $this->save_categories_in_exercise($this->categories);

        return $this->iid;
    }

    /**
     * Updates question position.
     *
     * @return bool
     */
    public function update_question_positions()
    {
        $table = Database::get_course_table(TABLE_QUIZ_TEST_QUESTION);
        // Fixes #3483 when updating order
        $questionList = $this->selectQuestionList(true);

        if (empty($this->iid)) {
            return false;
        }

        if (!empty($questionList)) {
            foreach ($questionList as $position => $questionId) {
                $position = (int) $position;
                $questionId = (int) $questionId;
                $sql = "UPDATE $table SET
                            question_order ='".$position."'
                        WHERE
                            question_id = ".$questionId." AND
                            exercice_id=".$this->iid;
                Database::query($sql);
            }
        }

        return true;
    }

    /**
     * Adds a question into the question list.
     *
     * @author Olivier Brouckaert
     *
     * @param int $questionId - question ID
     *
     * @return bool - true if the question has been added, otherwise false
     */
    public function addToList($questionId)
    {
        // checks if the question ID is not in the list
        if (!$this->isInList($questionId)) {
            // selects the max position
            if (!$this->selectNbrQuestions()) {
                $pos = 1;
            } else {
                if (is_array($this->questionList)) {
                    $pos = max(array_keys($this->questionList)) + 1;
                }
            }
            $this->questionList[$pos] = $questionId;

            return true;
        }

        return false;
    }

    /**
     * removes a question from the question list.
     *
     * @author Olivier Brouckaert
     *
     * @param int $questionId - question ID
     *
     * @return bool - true if the question has been removed, otherwise false
     */
    public function removeFromList($questionId)
    {
        // searches the position of the question ID in the list
        $pos = array_search($questionId, $this->questionList);
        // question not found
        if (false === $pos) {
            return false;
        } else {
            // dont reduce the number of random question if we use random by category option, or if
            // random all questions
            if ($this->isRandom() && 0 == $this->isRandomByCat()) {
                if (count($this->questionList) >= $this->random && $this->random > 0) {
                    $this->random--;
                    $this->save();
                }
            }
            // deletes the position from the array containing the wanted question ID
            unset($this->questionList[$pos]);

            return true;
        }
    }

    /**
     * Marks the exercise as deleted.
     * If $delete argument set, completely deletes it from the database.
     * Note: leaves the questions in the database as "orphan" questions
     * (unless used by other tests).
     *
     * @param bool $delete          Whether to really delete the test (true) or only mark it (false = default)
     * @param bool $deleteQuestions Whether to delete the test questions (true)
     *
     * @return bool Whether the operation was successful or not
     *
     * @author Olivier Brouckaert
     * @author Yannick Warnier
     */
    public function delete(bool $delete = false, bool $deleteQuestions = false): bool
    {
        $limitTeacherAccess = api_get_configuration_value('limit_exercise_teacher_access');

        if ($limitTeacherAccess && !api_is_platform_admin()) {
            return false;
        }

        $locked = api_resource_is_locked_by_gradebook(
            $this->iid,
            LINK_EXERCISE
        );

        if ($locked) {
            return false;
        }

        $table = Database::get_course_table(TABLE_QUIZ_TEST);
        $sql = "UPDATE $table SET active='-1'
                WHERE iid = ".$this->iid;
        Database::query($sql);

        api_item_property_update(
            $this->course,
            TOOL_QUIZ,
            $this->iid,
            'QuizDeleted',
            api_get_user_id()
        );
        api_item_property_update(
            $this->course,
            TOOL_QUIZ,
            $this->iid,
            'delete',
            api_get_user_id()
        );

        Skill::deleteSkillsFromItem($this->iid, ITEM_TYPE_EXERCISE);

        if (api_get_setting('search_enabled') === 'true' &&
            extension_loaded('xapian')
        ) {
            $this->search_engine_delete();
        }

        $linkInfo = GradebookUtils::isResourceInCourseGradebook(
            $this->course['code'],
            LINK_EXERCISE,
            $this->iid,
            $this->sessionId
        );

        if ($linkInfo !== false) {
            GradebookUtils::remove_resource_from_course_gradebook($linkInfo['id']);
        }

        $questions = [];

        if ($delete || $deleteQuestions) {
            $questions = $this->getQuestionOrderedList(true);
        }

        if ($deleteQuestions) {
            // Delete the questions of the test (this could delete questions reused on other tests)
            foreach ($questions as $order => $questionId) {
                $masterExerciseId = Question::getMasterQuizForQuestion($questionId);
                if ($masterExerciseId == $this->iid) {
                    $objQuestionTmp = Question::read($questionId);
                    $objQuestionTmp->delete();
                    $this->removeFromList($questionId);
                }
            }
        }

        if ($delete) {
            // Really delete the test (if questions were not previously deleted these will be orphaned)
            foreach ($questions as $order => $questionId) {
                $question = Question::read($questionId, $this->course);
                $question->delete($this->course_id);
            }
            $sql = "DELETE FROM $table
                WHERE iid = ".$this->iid;
            Database::query($sql);
        }
        Event::addEvent(
            LOG_EXERCISE_DELETE,
            LOG_EXERCISE_ID,
            $this->iid
        );

        return true;
    }

    /**
     * Creates the form to create / edit an exercise.
     *
     * @param FormValidator $form
     * @param string        $type
     */
    public function createForm($form, $type = 'full')
    {
        if (empty($type)) {
            $type = 'full';
        }

        // Form title
        $form_title = get_lang('NewEx');
        if (!empty($_GET['exerciseId'])) {
            $form_title = get_lang('ModifyExercise');
        }

        $form->addHeader($form_title);
        $form->protect();

        // Title.
        if (api_get_configuration_value('save_titles_as_html')) {
            $form->addHtmlEditor(
                'exerciseTitle',
                get_lang('ExerciseName'),
                false,
                false,
                ['ToolbarSet' => 'TitleAsHtml']
            );
        } else {
            $form->addElement(
                'text',
                'exerciseTitle',
                get_lang('ExerciseName'),
                ['id' => 'exercise_title']
            );
        }

        $form->addElement('advanced_settings', 'advanced_params', get_lang('AdvancedParameters'));
        $form->addElement('html', '<div id="advanced_params_options" style="display:none">');

        if (api_get_configuration_value('allow_exercise_categories')) {
            $categoryManager = new ExerciseCategoryManager();
            $categories = $categoryManager->getCategories(api_get_course_int_id());
            $options = [];
            if (!empty($categories)) {
                /** @var CExerciseCategory $category */
                foreach ($categories as $category) {
                    $options[$category->getId()] = $category->getName();
                }
            }

            $form->addSelect(
                'exercise_category_id',
                get_lang('Category'),
                $options,
                ['placeholder' => get_lang('SelectAnOption')]
            );
        }

        $editor_config = [
            'ToolbarSet' => 'TestQuestionDescription',
            'Width' => '100%',
            'Height' => '150',
        ];

        if (is_array($type)) {
            $editor_config = array_merge($editor_config, $type);
        }

        $form->addHtmlEditor(
            'exerciseDescription',
            get_lang('ExerciseDescription'),
            false,
            false,
            $editor_config
        );

        $skillList = [];
        if ('full' === $type) {
            // Can't modify a DirectFeedback question.
            if (!in_array($this->getFeedbackType(), [EXERCISE_FEEDBACK_TYPE_DIRECT, EXERCISE_FEEDBACK_TYPE_POPUP])) {
                $this->setResultFeedbackGroup($form);

                // Type of results display on the final page
                $this->setResultDisabledGroup($form);

                // Type of questions disposition on page
                $radios = [];
                $radios[] = $form->createElement(
                    'radio',
                    'exerciseType',
                    null,
                    get_lang('SimpleExercise'),
                    '1',
                    [
                        'onclick' => 'check_per_page_all()',
                        'id' => 'option_page_all',
                    ]
                );
                $radios[] = $form->createElement(
                    'radio',
                    'exerciseType',
                    null,
                    get_lang('SequentialExercise'),
                    '2',
                    [
                        'onclick' => 'check_per_page_one()',
                        'id' => 'option_page_one',
                    ]
                );

                $form->addGroup($radios, null, get_lang('QuestionsPerPage'));
            } else {
                // if is Direct feedback but has not questions we can allow to modify the question type
                if (empty($this->iid) || 0 === $this->getQuestionCount()) {
                    $this->setResultFeedbackGroup($form);
                    $this->setResultDisabledGroup($form);

                    // Type of questions disposition on page
                    $radios = [];
                    $radios[] = $form->createElement('radio', 'exerciseType', null, get_lang('SimpleExercise'), '1');
                    $radios[] = $form->createElement(
                        'radio',
                        'exerciseType',
                        null,
                        get_lang('SequentialExercise'),
                        '2'
                    );
                    $form->addGroup($radios, null, get_lang('ExerciseType'));
                } else {
                    $this->setResultFeedbackGroup($form, true);
                    $group = $this->setResultDisabledGroup($form);
                    $group->freeze();

                    // we force the options to the DirectFeedback exercisetype
                    //$form->addElement('hidden', 'exerciseFeedbackType', $this->getFeedbackType());
                    //$form->addElement('hidden', 'exerciseType', ONE_PER_PAGE);

                    // Type of questions disposition on page
                    $radios[] = $form->createElement(
                        'radio',
                        'exerciseType',
                        null,
                        get_lang('SimpleExercise'),
                        '1',
                        [
                            'onclick' => 'check_per_page_all()',
                            'id' => 'option_page_all',
                        ]
                    );
                    $radios[] = $form->createElement(
                        'radio',
                        'exerciseType',
                        null,
                        get_lang('SequentialExercise'),
                        '2',
                        [
                            'onclick' => 'check_per_page_one()',
                            'id' => 'option_page_one',
                        ]
                    );

                    $type_group = $form->addGroup($radios, null, get_lang('QuestionsPerPage'));
                    $type_group->freeze();
                }
            }

            $option = [
                EX_Q_SELECTION_ORDERED => get_lang('OrderedByUser'),
                //  Defined by user
                EX_Q_SELECTION_RANDOM => get_lang('Random'),
                // 1-10, All
                'per_categories' => '--------'.get_lang('UsingCategories').'----------',
                // Base (A 123 {3} B 456 {3} C 789{2} D 0{0}) --> Matrix {3, 3, 2, 0}
                EX_Q_SELECTION_CATEGORIES_ORDERED_QUESTIONS_ORDERED => get_lang('OrderedCategoriesAlphabeticallyWithQuestionsOrdered'),
                // A 123 B 456 C 78 (0, 1, all)
                EX_Q_SELECTION_CATEGORIES_RANDOM_QUESTIONS_ORDERED => get_lang('RandomCategoriesWithQuestionsOrdered'),
                // C 78 B 456 A 123
                EX_Q_SELECTION_CATEGORIES_ORDERED_QUESTIONS_RANDOM => get_lang('OrderedCategoriesAlphabeticallyWithRandomQuestions'),
                // A 321 B 654 C 87
                EX_Q_SELECTION_CATEGORIES_RANDOM_QUESTIONS_RANDOM => get_lang('RandomCategoriesWithRandomQuestions'),
                // C 87 B 654 A 321
                //EX_Q_SELECTION_CATEGORIES_RANDOM_QUESTIONS_ORDERED_NO_GROUPED => get_lang('RandomCategoriesWithQuestionsOrderedNoQuestionGrouped'),
                /*    B 456 C 78 A 123
                        456 78 123
                        123 456 78
                */
                //EX_Q_SELECTION_CATEGORIES_RANDOM_QUESTIONS_RANDOM_NO_GROUPED => get_lang('RandomCategoriesWithRandomQuestionsNoQuestionGrouped'),
                /*
                    A 123 B 456 C 78
                    B 456 C 78 A 123
                    B 654 C 87 A 321
                    654 87 321
                    165 842 73
                */
                //EX_Q_SELECTION_CATEGORIES_ORDERED_BY_PARENT_QUESTIONS_ORDERED => get_lang('OrderedCategoriesByParentWithQuestionsOrdered'),
                //EX_Q_SELECTION_CATEGORIES_ORDERED_BY_PARENT_QUESTIONS_RANDOM => get_lang('OrderedCategoriesByParentWithQuestionsRandom'),
            ];

            $form->addElement(
                'select',
                'question_selection_type',
                [get_lang('QuestionSelection')],
                $option,
                [
                    'id' => 'questionSelection',
                    'onchange' => 'checkQuestionSelection()',
                ]
            );

            $pageConfig = api_get_configuration_value('allow_quiz_results_page_config');
            if ($pageConfig) {
                $group = [
                    $form->createElement(
                        'checkbox',
                        'hide_expected_answer',
                        null,
                        get_lang('HideExpectedAnswer')
                    ),
                    $form->createElement(
                        'checkbox',
                        'hide_total_score',
                        null,
                        get_lang('HideTotalScore')
                    ),
                    $form->createElement(
                        'checkbox',
                        'hide_question_score',
                        null,
                        get_lang('HideQuestionScore')
                    ),
                    $form->createElement(
                        'checkbox',
                        'hide_category_table',
                        null,
                        get_lang('HideCategoryTable')
                    ),
                    $form->createElement(
                        'checkbox',
                        'hide_correct_answered_questions',
                        null,
                        get_lang('HideCorrectAnsweredQuestions')
                    ),
                    $form->createElement(
                        'checkbox',
                        'hide_comment',
                        null,
                        get_lang('HideComment')
                    ),
                ];
                $form->addGroup($group, null, get_lang('ResultsConfigurationPage'));
            }
            $showHideConfiguration = api_get_configuration_value('quiz_hide_question_number');
            if ($showHideConfiguration) {
                $group = [
                    $form->createElement('radio', 'hide_question_number', null, get_lang('Yes'), '1'),
                    $form->createElement('radio', 'hide_question_number', null, get_lang('No'), '0'),
                ];
                $form->addGroup($group, null, get_lang('HideQuestionNumber'));
            }

            $displayMatrix = 'none';
            $displayRandom = 'none';
            $selectionType = $this->getQuestionSelectionType();
            switch ($selectionType) {
                case EX_Q_SELECTION_RANDOM:
                    $displayRandom = 'block';
                    break;
                case $selectionType >= EX_Q_SELECTION_CATEGORIES_ORDERED_QUESTIONS_ORDERED:
                    $displayMatrix = 'block';
                    break;
            }

            $form->addHtml('<div id="hidden_random" style="display:'.$displayRandom.'">');
            // Number of random question.
            $max = ($this->iid > 0) ? $this->getQuestionCount() : 10;
            $option = range(0, $max);
            $option[0] = get_lang('No');
            $option[-1] = get_lang('AllQuestionsShort');
            $form->addElement(
                'select',
                'randomQuestions',
                [
                    get_lang('RandomQuestions'),
                    get_lang('RandomQuestionsHelp'),
                ],
                $option,
                ['id' => 'randomQuestions']
            );
            $form->addHtml('</div>');
            $form->addHtml('<div id="hidden_matrix" style="display:'.$displayMatrix.'">');

            // Category selection.
            $cat = new TestCategory();
            $cat_form = $cat->returnCategoryForm($this);
            if (empty($cat_form)) {
                $cat_form = '<span class="label label-warning">'.get_lang('NoCategoriesDefined').'</span>';
            }
            $form->addElement('label', null, $cat_form);
            $form->addHtml('</div>');

            // Random answers.
            $radios_random_answers = [
                $form->createElement('radio', 'randomAnswers', null, get_lang('Yes'), '1'),
                $form->createElement('radio', 'randomAnswers', null, get_lang('No'), '0'),
            ];
            $form->addGroup($radios_random_answers, null, get_lang('RandomAnswers'));

            // Category name.
            $radio_display_cat_name = [
                $form->createElement('radio', 'display_category_name', null, get_lang('Yes'), '1'),
                $form->createElement('radio', 'display_category_name', null, get_lang('No'), '0'),
            ];
            $form->addGroup($radio_display_cat_name, null, get_lang('QuestionDisplayCategoryName'));

            // Hide question title.
            $group = [
                $form->createElement('radio', 'hide_question_title', null, get_lang('Yes'), '1'),
                $form->createElement('radio', 'hide_question_title', null, get_lang('No'), '0'),
            ];
            $form->addGroup($group, null, get_lang('HideQuestionTitle'));

            $allow = api_get_configuration_value('allow_quiz_show_previous_button_setting');
            if (true === $allow) {
                // Hide question title.
                $group = [
                    $form->createElement(
                        'radio',
                        'show_previous_button',
                        null,
                        get_lang('Yes'),
                        '1'
                    ),
                    $form->createElement(
                        'radio',
                        'show_previous_button',
                        null,
                        get_lang('No'),
                        '0'
                    ),
                ];
                $form->addGroup($group, null, get_lang('ShowPreviousButton'));
            }

            $form->addElement(
                'number',
                'exerciseAttempts',
                get_lang('ExerciseAttempts'),
                null,
                ['id' => 'exerciseAttempts']
            );

            // Exercise time limit
            $form->addElement(
                'checkbox',
                'activate_start_date_check',
                null,
                get_lang('EnableStartTime'),
                ['onclick' => 'activate_start_date()']
            );

            if (!empty($this->start_time)) {
                $form->addElement('html', '<div id="start_date_div" style="display:block;">');
            } else {
                $form->addElement('html', '<div id="start_date_div" style="display:none;">');
            }

            $form->addElement('date_time_picker', 'start_time');
            $form->addElement('html', '</div>');
            $form->addElement(
                'checkbox',
                'activate_end_date_check',
                null,
                get_lang('EnableEndTime'),
                ['onclick' => 'activate_end_date()']
            );

            if (!empty($this->end_time)) {
                $form->addHtml('<div id="end_date_div" style="display:block;">');
            } else {
                $form->addHtml('<div id="end_date_div" style="display:none;">');
            }

            $form->addElement('date_time_picker', 'end_time');
            $form->addElement('html', '</div>');

            $display = 'block';
            $form->addElement(
                'checkbox',
                'propagate_neg',
                null,
                get_lang('PropagateNegativeResults')
            );

            if (api_get_configuration_value('allow_quiz_save_correct_options')) {
                $options = [
                    '' => get_lang('SelectAnOption'),
                    1 => get_lang('SaveTheCorrectAnswersForTheNextAttempt'),
                    2 => get_lang('SaveAllAnswers'),
                ];
                $form->addSelect(
                    'save_correct_answers',
                    get_lang('SaveAnswers'),
                    $options
                );
            } else {
                $form->addCheckBox(
                    'save_correct_answers',
                    null,
                    get_lang('SaveTheCorrectAnswersForTheNextAttempt')
                );
            }

            $form->addElement('html', '<div class="clear">&nbsp;</div>');
            $form->addElement('checkbox', 'review_answers', null, get_lang('ReviewAnswers'));
            $form->addElement('html', '<div id="divtimecontrol"  style="display:'.$display.';">');

            // Timer control
            $form->addElement(
                'checkbox',
                'enabletimercontrol',
                null,
                get_lang('EnableTimerControl'),
                [
                    'onclick' => 'option_time_expired()',
                    'id' => 'enabletimercontrol',
                    'onload' => 'check_load_time()',
                ]
            );

            $expired_date = (int) $this->selectExpiredTime();

            if (($expired_date != '0')) {
                $form->addElement('html', '<div id="timercontrol" style="display:block;">');
            } else {
                $form->addElement('html', '<div id="timercontrol" style="display:none;">');
            }
            $form->addText(
                'enabletimercontroltotalminutes',
                get_lang('ExerciseTotalDurationInMinutes'),
                false,
                [
                    'id' => 'enabletimercontroltotalminutes',
                    'cols-size' => [2, 2, 8],
                ]
            );
            $form->addElement('html', '</div>');

            if (api_get_configuration_value('quiz_prevent_backwards_move')) {
                $form->addCheckBox(
                    'prevent_backwards',
                    null,
                    get_lang('QuizPreventBackwards')
                );
            }

            $form->addElement(
                'text',
                'pass_percentage',
                [get_lang('PassPercentage'), null, '%'],
                ['id' => 'pass_percentage']
            );

            $form->addRule('pass_percentage', get_lang('Numeric'), 'numeric');
            $form->addRule('pass_percentage', get_lang('ValueTooSmall'), 'min_numeric_length', 0);
            $form->addRule('pass_percentage', get_lang('ValueTooBig'), 'max_numeric_length', 100);

            // add the text_when_finished textbox
            $form->addHtmlEditor(
                'text_when_finished',
                get_lang('TextWhenFinished'),
                false,
                false,
                $editor_config
            );

            if (true === api_get_configuration_value('exercise_text_when_finished_failure')) {
                $form->addHtmlEditor(
                    'text_when_finished_failure',
                    get_lang('TextAppearingAtTheEndOfTheTestWhenTheUserHasFailed'),
                    false,
                    false,
                    $editor_config
                );
            }

            $allow = api_get_configuration_value('allow_notification_setting_per_exercise');
            if ($allow === true) {
                $settings = ExerciseLib::getNotificationSettings();
                $group = [];
                foreach ($settings as $itemId => $label) {
                    $group[] = $form->createElement(
                        'checkbox',
                        'notifications[]',
                        null,
                        $label,
                        ['value' => $itemId]
                    );
                }
                $form->addGroup($group, '', [get_lang('EmailNotifications')]);
            }

            $form->addCheckBox(
                'update_title_in_lps',
                null,
                get_lang('UpdateTitleInLps')
            );

            $allowHideAttempts = api_get_configuration_value('quiz_hide_attempts_table_on_start_page');
            if ($allowHideAttempts) {
                $group = [
                    $form->createElement('radio', 'hide_attempts_table', null, get_lang('Yes'), '1'),
                    $form->createElement('radio', 'hide_attempts_table', null, get_lang('No'), '0'),
                ];
                $form->addGroup($group, null, get_lang('HideAttemptsTableOnStartPage'));
            }

            $defaults = [];
            if (api_get_setting('search_enabled') === 'true') {
                require_once api_get_path(LIBRARY_PATH).'specific_fields_manager.lib.php';
                $form->addElement('checkbox', 'index_document', '', get_lang('SearchFeatureDoIndexDocument'));
                $form->addSelectLanguage('language', get_lang('SearchFeatureDocumentLanguage'));
                $specific_fields = get_specific_field_list();

                foreach ($specific_fields as $specific_field) {
                    $form->addElement('text', $specific_field['code'], $specific_field['name']);
                    $filter = [
                        'c_id' => api_get_course_int_id(),
                        'field_id' => $specific_field['id'],
                        'ref_id' => $this->iid,
                        'tool_id' => "'".TOOL_QUIZ."'",
                    ];
                    $values = get_specific_field_values_list($filter, ['value']);
                    if (!empty($values)) {
                        $arr_str_values = [];
                        foreach ($values as $value) {
                            $arr_str_values[] = $value['value'];
                        }
                        $defaults[$specific_field['code']] = implode(', ', $arr_str_values);
                    }
                }
            }

            Skill::addSkillsToForm($form, api_get_course_int_id(), api_get_session_id(), ITEM_TYPE_EXERCISE, $this->iid);

            $extraField = new ExtraField('exercise');
            $extraField->addElements(
                $form,
                $this->iid,
                [
                    'notifications',
                    'remedialcourselist',
                    'advancedcourselist',
                    'subscribe_session_when_finished_failure',
                ], //exclude
                false, // filter
                false, // tag as select
                [], //show only fields
                [], // order fields
                [] // extra data
            );

            // See BT#18165
            $remedialList = [
                'remedialcourselist' => 'RemedialCourses',
                'advancedcourselist' => 'AdvancedCourses',
            ];
            $extraFieldExercice = new ExtraField('exercise');
            $extraFieldExerciceValue = new ExtraFieldValue('exercise');
            $pluginRemedial = api_get_plugin_setting('remedial_course', 'enabled') === 'true';
            if ($pluginRemedial) {
                $sessionId = api_get_session_id();
                $userId = api_get_user_id();
                foreach ($remedialList as $item => $label) {
                    $remedialField = $extraFieldExercice->get_handler_field_info_by_field_variable($item);
                    $optionRemedial = [];
                    $defaults[$item] = [];
                    $remedialExtraValue = $extraFieldExerciceValue->get_values_by_handler_and_field_id($this->iid, $remedialField['id']);
                    $defaults[$item] = isset($remedialExtraValue['value']) ? explode(';', $remedialExtraValue['value']) : [];
                    if ($sessionId != 0) {
                        $courseList = SessionManager::getCoursesInSession($sessionId);
                        foreach ($courseList as $course) {
                            $courseSession = api_get_course_info_by_id($course);
                            if (!empty($courseSession) && isset($courseSession['real_id'])) {
                                $courseId = $courseSession['real_id'];
                                if (api_get_course_int_id() != $courseId) {
                                    $optionRemedial[$courseId] = $courseSession['title'];
                                }
                            }
                        }
                    } else {
                        $courseList = CourseManager::get_course_list();
                        foreach ($courseList as $course) {
                            if (!empty($course) && isset($course['real_id'])) {
                                $courseId = $course['real_id'];
                                if (api_get_course_int_id() != $courseId) {
                                    $optionRemedial[$courseId] = $course['title'];
                                }
                            }
                        }
                    }
                    unset($optionRemedial[0]);
                    $form->addSelect(
                        "extra_".$item,
                        get_plugin_lang($label, RemedialCoursePlugin::class),
                        $optionRemedial,
                        [
                            'placeholder' => get_lang('SelectAnOption'),
                            'multiple' => 'multiple',
                        ]
                    );
                }
            }

            if (true === api_get_configuration_value('exercise_subscribe_session_when_finished_failure')) {
                $optionSessionWhenFailure = [];

                if ($failureSession = ExerciseLib::getSessionWhenFinishedFailure($this->iid)) {
                    $defaults['subscribe_session_when_finished_failure'] = $failureSession->getId();
                    $optionSessionWhenFailure[$failureSession->getId()] = $failureSession->getName();
                }

                $form->addSelectAjax(
                    'extra_subscribe_session_when_finished_failure',
                    get_lang('SubscribeSessionWhenFinishedFailure'),
                    $optionSessionWhenFailure,
                    [
                        'url' => api_get_path(WEB_AJAX_PATH).'session.ajax.php?'
                            .http_build_query(['a' => 'search_session']),
                    ]
                );
            }

            $settings = api_get_configuration_value('exercise_finished_notification_settings');
            if (!empty($settings)) {
                $options = [];
                foreach ($settings as $name => $data) {
                    $options[$name] = $name;
                }
                $form->addSelect(
                    'extra_notifications',
                    get_lang('Notifications'),
                    $options,
                    ['placeholder' => get_lang('SelectAnOption')]
                );
            }
            $form->addElement('html', '</div>'); //End advanced setting
            $form->addElement('html', '</div>');
        }

        // submit
        if (isset($_GET['exerciseId'])) {
            $form->addButtonSave(get_lang('ModifyExercise'), 'submitExercise');
        } else {
            $form->addButtonUpdate(get_lang('ProcedToQuestions'), 'submitExercise');
        }

        $form->addRule('exerciseTitle', get_lang('GiveExerciseName'), 'required');

        // defaults
        if ($type == 'full') {
            // rules
            $form->addRule('exerciseAttempts', get_lang('Numeric'), 'numeric');
            $form->addRule('start_time', get_lang('InvalidDate'), 'datetime');
            $form->addRule('end_time', get_lang('InvalidDate'), 'datetime');

            if ($this->iid > 0) {
                $defaults['randomQuestions'] = $this->random;
                $defaults['randomAnswers'] = $this->getRandomAnswers();
                $defaults['exerciseType'] = $this->selectType();
                $defaults['exerciseTitle'] = $this->get_formated_title();
                $defaults['exerciseDescription'] = $this->selectDescription();
                $defaults['exerciseAttempts'] = $this->selectAttempts();
                $defaults['exerciseFeedbackType'] = $this->getFeedbackType();
                $defaults['results_disabled'] = $this->selectResultsDisabled();
                $defaults['propagate_neg'] = $this->selectPropagateNeg();
                $defaults['save_correct_answers'] = $this->getSaveCorrectAnswers();
                $defaults['review_answers'] = $this->review_answers;
                $defaults['randomByCat'] = $this->getRandomByCategory();
                $defaults['text_when_finished'] = $this->getTextWhenFinished();
                $defaults['display_category_name'] = $this->selectDisplayCategoryName();
                $defaults['pass_percentage'] = $this->selectPassPercentage();
                $defaults['question_selection_type'] = $this->getQuestionSelectionType();
                $defaults['hide_question_title'] = $this->getHideQuestionTitle();
                $defaults['show_previous_button'] = $this->showPreviousButton();
                $defaults['exercise_category_id'] = $this->getExerciseCategoryId();
                $defaults['prevent_backwards'] = $this->getPreventBackwards();

                if (true === api_get_configuration_value('exercise_text_when_finished_failure')) {
                    $defaults['text_when_finished_failure'] = $this->getTextWhenFinishedFailure();
                }

                if (!empty($this->start_time)) {
                    $defaults['activate_start_date_check'] = 1;
                }
                if (!empty($this->end_time)) {
                    $defaults['activate_end_date_check'] = 1;
                }

                $defaults['start_time'] = !empty($this->start_time) ? api_get_local_time($this->start_time) : date('Y-m-d 12:00:00');
                $defaults['end_time'] = !empty($this->end_time) ? api_get_local_time($this->end_time) : date('Y-m-d 12:00:00', time() + 84600);

                // Get expired time
                if ($this->expired_time != '0') {
                    $defaults['enabletimercontrol'] = 1;
                    $defaults['enabletimercontroltotalminutes'] = $this->expired_time;
                } else {
                    $defaults['enabletimercontroltotalminutes'] = 0;
                }
                $defaults['notifications'] = $this->getNotifications();
            } else {
                $defaults['exerciseType'] = 2;
                $defaults['exerciseAttempts'] = 0;
                $defaults['randomQuestions'] = 0;
                $defaults['randomAnswers'] = 0;
                $defaults['exerciseDescription'] = '';
                $defaults['exerciseFeedbackType'] = 0;
                $defaults['results_disabled'] = 0;
                $defaults['randomByCat'] = 0;
                $defaults['text_when_finished'] = '';

                if (true === api_get_configuration_value('exercise_text_when_finished_failure')) {
                    $defaults['text_when_finished_failure'] = '';
                }

                $defaults['start_time'] = date('Y-m-d 12:00:00');
                $defaults['display_category_name'] = 1;
                $defaults['end_time'] = date('Y-m-d 12:00:00', time() + 84600);
                $defaults['pass_percentage'] = '';
                $defaults['end_button'] = $this->selectEndButton();
                $defaults['question_selection_type'] = 1;
                $defaults['hide_question_title'] = 0;
                $defaults['show_previous_button'] = 1;
                $defaults['on_success_message'] = null;
                $defaults['on_failed_message'] = null;
            }
        } else {
            $defaults['exerciseTitle'] = $this->selectTitle();
            $defaults['exerciseDescription'] = $this->selectDescription();
        }

        if (api_get_setting('search_enabled') === 'true') {
            $defaults['index_document'] = 'checked="checked"';
        }

        $this->setPageResultConfigurationDefaults($defaults);
        $this->setHideQuestionNumberDefaults($defaults);
        $this->setHideAttemptsTableOnStartPageDefaults($defaults);
        $form->setDefaults($defaults);

        // Freeze some elements.
        if ($this->iid != 0 && $this->edit_exercise_in_lp == false) {
            $elementsToFreeze = [
                'randomQuestions',
                //'randomByCat',
                'exerciseAttempts',
                'propagate_neg',
                'enabletimercontrol',
                'review_answers',
            ];

            foreach ($elementsToFreeze as $elementName) {
                /** @var HTML_QuickForm_element $element */
                $element = $form->getElement($elementName);
                $element->freeze();
            }
        }
    }

    public function setResultFeedbackGroup(FormValidator $form, $checkFreeze = true)
    {
        // Feedback type.
        $feedback = [];
        $warning = sprintf(
            get_lang('TheSettingXWillChangeToX'),
            get_lang('ShowResultsToStudents'),
            get_lang('ShowScoreAndRightAnswer')
        );
        $endTest = $form->createElement(
            'radio',
            'exerciseFeedbackType',
            null,
            get_lang('ExerciseAtTheEndOfTheTest'),
            EXERCISE_FEEDBACK_TYPE_END,
            [
                'id' => 'exerciseType_'.EXERCISE_FEEDBACK_TYPE_END,
                //'onclick' => 'if confirm() check_feedback()',
                'onclick' => 'javascript:if(confirm('."'".addslashes($warning)."'".')) { check_feedback(); } else { return false;} ',
            ]
        );

        $noFeedBack = $form->createElement(
            'radio',
            'exerciseFeedbackType',
            null,
            get_lang('NoFeedback'),
            EXERCISE_FEEDBACK_TYPE_EXAM,
            [
                'id' => 'exerciseType_'.EXERCISE_FEEDBACK_TYPE_EXAM,
            ]
        );

        $feedback[] = $endTest;
        $feedback[] = $noFeedBack;

        $scenarioEnabled = 'true' === api_get_setting('enable_quiz_scenario');
        $freeze = true;
        if ($scenarioEnabled) {
            if ($this->getQuestionCount() > 0) {
                $hasDifferentQuestion = $this->hasQuestionWithTypeNotInList([UNIQUE_ANSWER, HOT_SPOT_DELINEATION]);

                if (false === $hasDifferentQuestion) {
                    $freeze = false;
                }
            } else {
                $freeze = false;
            }

            $direct = $form->createElement(
                'radio',
                'exerciseFeedbackType',
                null,
                get_lang('DirectFeedback'),
                EXERCISE_FEEDBACK_TYPE_DIRECT,
                [
                    'id' => 'exerciseType_'.EXERCISE_FEEDBACK_TYPE_DIRECT,
                    'onclick' => 'check_direct_feedback()',
                ]
            );

            $directPopUp = $form->createElement(
                'radio',
                'exerciseFeedbackType',
                null,
                get_lang('ExerciseDirectPopUp'),
                EXERCISE_FEEDBACK_TYPE_POPUP,
                ['id' => 'exerciseType_'.EXERCISE_FEEDBACK_TYPE_POPUP, 'onclick' => 'check_direct_feedback()']
            );

            if ($freeze) {
                $direct->freeze();
                $directPopUp->freeze();
            }

            // If has delineation freeze all.
            $hasDelineation = $this->hasQuestionWithType(HOT_SPOT_DELINEATION);
            if ($hasDelineation) {
                $endTest->freeze();
                $noFeedBack->freeze();
                $direct->freeze();
                $directPopUp->freeze();
            }

            $feedback[] = $direct;
            $feedback[] = $directPopUp;
        }

        $form->addGroup(
            $feedback,
            null,
            [
                get_lang('FeedbackType'),
                get_lang('FeedbackDisplayOptions'),
            ]
        );
    }

    /**
     * function which process the creation of exercises.
     *
     * @param FormValidator $form
     * @param string
     *
     * @return int c_quiz.iid
     */
    public function processCreation($form, $type = '')
    {
        $this->updateTitle(self::format_title_variable($form->getSubmitValue('exerciseTitle')));
        $this->updateDescription($form->getSubmitValue('exerciseDescription'));
        $this->updateAttempts($form->getSubmitValue('exerciseAttempts'));
        $this->updateFeedbackType($form->getSubmitValue('exerciseFeedbackType'));
        $this->updateType($form->getSubmitValue('exerciseType'));

        // If direct feedback then force to One per page
        if (EXERCISE_FEEDBACK_TYPE_DIRECT == $form->getSubmitValue('exerciseFeedbackType')) {
            $this->updateType(ONE_PER_PAGE);
        }

        $this->setRandom($form->getSubmitValue('randomQuestions'));
        $this->updateRandomAnswers($form->getSubmitValue('randomAnswers'));
        $this->updateResultsDisabled($form->getSubmitValue('results_disabled'));
        $this->updateExpiredTime($form->getSubmitValue('enabletimercontroltotalminutes'));
        $this->updatePropagateNegative($form->getSubmitValue('propagate_neg'));
        $this->updateSaveCorrectAnswers($form->getSubmitValue('save_correct_answers'));
        $this->updateRandomByCat($form->getSubmitValue('randomByCat'));
        $this->updateTextWhenFinished($form->getSubmitValue('text_when_finished'));

        if (true === api_get_configuration_value('exercise_text_when_finished_failure')) {
            $this->setTextWhenFinishedFailure($form->getSubmitValue('text_when_finished_failure'));
        }

        $this->updateDisplayCategoryName($form->getSubmitValue('display_category_name'));
        $this->updateReviewAnswers($form->getSubmitValue('review_answers'));
        $this->updatePassPercentage($form->getSubmitValue('pass_percentage'));
        $this->updateCategories($form->getSubmitValue('category'));
        $this->updateEndButton($form->getSubmitValue('end_button'));
        $this->setOnSuccessMessage($form->getSubmitValue('on_success_message'));
        $this->setOnFailedMessage($form->getSubmitValue('on_failed_message'));
        $this->updateEmailNotificationTemplate($form->getSubmitValue('email_notification_template'));
        $this->setEmailNotificationTemplateToUser($form->getSubmitValue('email_notification_template_to_user'));
        $this->setNotifyUserByEmail($form->getSubmitValue('notify_user_by_email'));
        $this->setModelType($form->getSubmitValue('model_type'));
        $this->setQuestionSelectionType($form->getSubmitValue('question_selection_type'));
        $this->setHideQuestionTitle($form->getSubmitValue('hide_question_title'));
        $this->sessionId = api_get_session_id();
        $this->setQuestionSelectionType($form->getSubmitValue('question_selection_type'));
        $this->setScoreTypeModel($form->getSubmitValue('score_type_model'));
        $this->setGlobalCategoryId($form->getSubmitValue('global_category_id'));
        $this->setShowPreviousButton($form->getSubmitValue('show_previous_button'));
        $this->setNotifications($form->getSubmitValue('notifications'));
        $this->setExerciseCategoryId($form->getSubmitValue('exercise_category_id'));
        $this->setPageResultConfiguration($form->getSubmitValues());
        $showHideConfiguration = api_get_configuration_value('quiz_hide_question_number');
        if ($showHideConfiguration) {
            $this->setHideQuestionNumber($form->getSubmitValue('hide_question_number'));
        }

        $this->setHideAttemptsTableOnStartPage($form->getSubmitValue('hide_attempts_table'));

        $this->preventBackwards = (int) $form->getSubmitValue('prevent_backwards');

        $this->start_time = null;
        if ($form->getSubmitValue('activate_start_date_check') == 1) {
            $start_time = $form->getSubmitValue('start_time');
            $this->start_time = api_get_utc_datetime($start_time);
        }

        $this->end_time = null;
        if ($form->getSubmitValue('activate_end_date_check') == 1) {
            $end_time = $form->getSubmitValue('end_time');
            $this->end_time = api_get_utc_datetime($end_time);
        }

        $this->expired_time = 0;
        if ($form->getSubmitValue('enabletimercontrol') == 1) {
            $expired_total_time = $form->getSubmitValue('enabletimercontroltotalminutes');
            if ($this->expired_time == 0) {
                $this->expired_time = $expired_total_time;
            }
        }

        $this->random_answers = 0;
        if ($form->getSubmitValue('randomAnswers') == 1) {
            $this->random_answers = 1;
        }

        // Update title in all LPs that have this quiz added
        if ($form->getSubmitValue('update_title_in_lps') == 1) {
            $courseId = api_get_course_int_id();
            $table = Database::get_course_table(TABLE_LP_ITEM);
            $sql = "SELECT * FROM $table
                    WHERE
                        c_id = $courseId AND
                        item_type = 'quiz' AND
                        path = '".$this->iid."'
                    ";
            $result = Database::query($sql);
            $items = Database::store_result($result);
            if (!empty($items)) {
                foreach ($items as $item) {
                    $itemId = $item['iid'];
                    $sql = "UPDATE $table SET title = '".$this->title."'
                            WHERE iid = $itemId AND c_id = $courseId ";
                    Database::query($sql);
                }
            }
        }

        $iid = $this->save($type);
        if (!empty($iid)) {
            $values = $form->getSubmitValues();
            $values['item_id'] = $iid;
            $extraFieldValue = new ExtraFieldValue('exercise');
            $extraFieldValue->saveFieldValues($values);

            Skill::saveSkills($form, ITEM_TYPE_EXERCISE, $iid);
        }
    }

    public function search_engine_save()
    {
        if ($_POST['index_document'] != 1) {
            return;
        }
        $course_id = api_get_course_id();

        require_once api_get_path(LIBRARY_PATH).'specific_fields_manager.lib.php';

        $specific_fields = get_specific_field_list();
        $ic_slide = new IndexableChunk();

        $all_specific_terms = '';
        foreach ($specific_fields as $specific_field) {
            if (isset($_REQUEST[$specific_field['code']])) {
                $sterms = trim($_REQUEST[$specific_field['code']]);
                if (!empty($sterms)) {
                    $all_specific_terms .= ' '.$sterms;
                    $sterms = explode(',', $sterms);
                    foreach ($sterms as $sterm) {
                        $ic_slide->addTerm(trim($sterm), $specific_field['code']);
                        add_specific_field_value($specific_field['id'], $course_id, TOOL_QUIZ, $this->iid, $sterm);
                    }
                }
            }
        }

        // build the chunk to index
        $ic_slide->addValue("title", $this->exercise);
        $ic_slide->addCourseId($course_id);
        $ic_slide->addToolId(TOOL_QUIZ);
        $xapian_data = [
            SE_COURSE_ID => $course_id,
            SE_TOOL_ID => TOOL_QUIZ,
            SE_DATA => ['type' => SE_DOCTYPE_EXERCISE_EXERCISE, 'exercise_id' => (int) $this->iid],
            SE_USER => (int) api_get_user_id(),
        ];
        $ic_slide->xapian_data = serialize($xapian_data);
        $exercise_description = $all_specific_terms.' '.$this->description;
        $ic_slide->addValue("content", $exercise_description);

        $di = new ChamiloIndexer();
        isset($_POST['language']) ? $lang = Database::escape_string($_POST['language']) : $lang = 'english';
        $di->connectDb(null, null, $lang);
        $di->addChunk($ic_slide);

        //index and return search engine document id
        $did = $di->index();
        if ($did) {
            // save it to db
            $tbl_se_ref = Database::get_main_table(TABLE_MAIN_SEARCH_ENGINE_REF);
            $sql = 'INSERT INTO %s (id, course_code, tool_id, ref_id_high_level, search_did)
			    VALUES (NULL , \'%s\', \'%s\', %s, %s)';
            $sql = sprintf($sql, $tbl_se_ref, $course_id, TOOL_QUIZ, $this->iid, $did);
            Database::query($sql);
        }
    }

    public function search_engine_edit()
    {
        // update search enchine and its values table if enabled
        if (api_get_setting('search_enabled') == 'true' && extension_loaded('xapian')) {
            $course_id = api_get_course_id();

            // actually, it consists on delete terms from db,
            // insert new ones, create a new search engine document, and remove the old one
            // get search_did
            $tbl_se_ref = Database::get_main_table(TABLE_MAIN_SEARCH_ENGINE_REF);
            $sql = 'SELECT * FROM %s WHERE course_code=\'%s\' AND tool_id=\'%s\' AND ref_id_high_level=%s LIMIT 1';
            $sql = sprintf($sql, $tbl_se_ref, $course_id, TOOL_QUIZ, $this->iid);
            $res = Database::query($sql);

            if (Database::num_rows($res) > 0) {
                require_once api_get_path(LIBRARY_PATH).'specific_fields_manager.lib.php';

                $se_ref = Database::fetch_array($res);
                $specific_fields = get_specific_field_list();
                $ic_slide = new IndexableChunk();

                $all_specific_terms = '';
                foreach ($specific_fields as $specific_field) {
                    delete_all_specific_field_value($course_id, $specific_field['id'], TOOL_QUIZ, $this->iid);
                    if (isset($_REQUEST[$specific_field['code']])) {
                        $sterms = trim($_REQUEST[$specific_field['code']]);
                        $all_specific_terms .= ' '.$sterms;
                        $sterms = explode(',', $sterms);
                        foreach ($sterms as $sterm) {
                            $ic_slide->addTerm(trim($sterm), $specific_field['code']);
                            add_specific_field_value($specific_field['id'], $course_id, TOOL_QUIZ, $this->iid, $sterm);
                        }
                    }
                }

                // build the chunk to index
                $ic_slide->addValue('title', $this->exercise);
                $ic_slide->addCourseId($course_id);
                $ic_slide->addToolId(TOOL_QUIZ);
                $xapian_data = [
                    SE_COURSE_ID => $course_id,
                    SE_TOOL_ID => TOOL_QUIZ,
                    SE_DATA => ['type' => SE_DOCTYPE_EXERCISE_EXERCISE, 'exercise_id' => $this->iid],
                    SE_USER => api_get_user_id(),
                ];
                $ic_slide->xapian_data = serialize($xapian_data);
                $exercise_description = $all_specific_terms.' '.$this->description;
                $ic_slide->addValue('content', $exercise_description);

                $di = new ChamiloIndexer();
                isset($_POST['language']) ? $lang = Database::escape_string($_POST['language']) : $lang = 'english';
                $di->connectDb(null, null, $lang);
                $di->remove_document($se_ref['search_did']);
                $di->addChunk($ic_slide);

                //index and return search engine document id
                $did = $di->index();
                if ($did) {
                    // save it to db
                    $sql = 'DELETE FROM %s WHERE course_code=\'%s\' AND tool_id=\'%s\' AND ref_id_high_level=\'%s\'';
                    $sql = sprintf($sql, $tbl_se_ref, $course_id, TOOL_QUIZ, $this->iid);
                    Database::query($sql);
                    $sql = 'INSERT INTO %s (id, course_code, tool_id, ref_id_high_level, search_did)
                        VALUES (NULL , \'%s\', \'%s\', %s, %s)';
                    $sql = sprintf($sql, $tbl_se_ref, $course_id, TOOL_QUIZ, $this->iid, $did);
                    Database::query($sql);
                }
            } else {
                $this->search_engine_save();
            }
        }
    }

    public function search_engine_delete()
    {
        // remove from search engine if enabled
        if ('true' == api_get_setting('search_enabled') && extension_loaded('xapian')) {
            $course_id = api_get_course_id();
            $tbl_se_ref = Database::get_main_table(TABLE_MAIN_SEARCH_ENGINE_REF);
            $sql = 'SELECT * FROM %s
                    WHERE course_code=\'%s\' AND tool_id=\'%s\' AND ref_id_high_level=%s AND ref_id_second_level IS NULL
                    LIMIT 1';
            $sql = sprintf($sql, $tbl_se_ref, $course_id, TOOL_QUIZ, $this->iid);
            $res = Database::query($sql);
            if (Database::num_rows($res) > 0) {
                $row = Database::fetch_array($res);
                $di = new ChamiloIndexer();
                $di->remove_document($row['search_did']);
                unset($di);
                $tbl_quiz_question = Database::get_course_table(TABLE_QUIZ_QUESTION);
                foreach ($this->questionList as $question_i) {
                    $sql = 'SELECT type FROM %s WHERE iid = %s';
                    $sql = sprintf($sql, $tbl_quiz_question, $question_i);
                    $qres = Database::query($sql);
                    if (Database::num_rows($qres) > 0) {
                        $qrow = Database::fetch_array($qres);
                        $objQuestion = Question::getInstance($qrow['type']);
                        $objQuestion = Question::read((int) $question_i);
                        $objQuestion->search_engine_edit($this->iid, false, true);
                        unset($objQuestion);
                    }
                }
            }
            $sql = 'DELETE FROM %s
                    WHERE course_code=\'%s\' AND tool_id=\'%s\' AND ref_id_high_level=%s AND ref_id_second_level IS NULL
                    LIMIT 1';
            $sql = sprintf($sql, $tbl_se_ref, $course_id, TOOL_QUIZ, $this->iid);
            Database::query($sql);

            // remove terms from db
            require_once api_get_path(LIBRARY_PATH).'specific_fields_manager.lib.php';
            delete_all_values_for_item($course_id, TOOL_QUIZ, $this->iid);
        }
    }

    public function selectExpiredTime()
    {
        return $this->expired_time;
    }

    /**
     * Cleans the student's results only for the Exercise tool (Not from the LP)
     * The LP results are NOT deleted by default, otherwise put $cleanLpTests = true
     * Works with exercises in sessions.
     *
     * @param bool   $cleanLpTests
     * @param string $cleanResultBeforeDate
     *
     * @return int quantity of user's exercises deleted
     */
    public function cleanResults($cleanLpTests = false, $cleanResultBeforeDate = null)
    {
        $sessionId = api_get_session_id();
        $table_track_e_exercises = Database::get_main_table(TABLE_STATISTIC_TRACK_E_EXERCISES);
        $table_track_e_attempt = Database::get_main_table(TABLE_STATISTIC_TRACK_E_ATTEMPT);

        $sql_where = '  AND
                        orig_lp_id = 0 AND
                        orig_lp_item_id = 0';

        // if we want to delete results from LP too
        if ($cleanLpTests) {
            $sql_where = '';
        }

        // if we want to delete attempts before date $cleanResultBeforeDate
        // $cleanResultBeforeDate must be a valid UTC-0 date yyyy-mm-dd

        if (!empty($cleanResultBeforeDate)) {
            $cleanResultBeforeDate = Database::escape_string($cleanResultBeforeDate);
            if (api_is_valid_date($cleanResultBeforeDate)) {
                $sql_where .= "  AND exe_date <= '$cleanResultBeforeDate' ";
            } else {
                return 0;
            }
        }

        $sql = "SELECT exe_id
            FROM $table_track_e_exercises
            WHERE
                c_id = ".api_get_course_int_id()." AND
                exe_exo_id = ".$this->iid." AND
                session_id = ".$sessionId." ".
                $sql_where;

        $result = Database::query($sql);
        $exe_list = Database::store_result($result);

        // deleting TRACK_E_ATTEMPT table
        // check if exe in learning path or not
        $i = 0;
        if (is_array($exe_list) && count($exe_list) > 0) {
            foreach ($exe_list as $item) {
                $sql = "DELETE FROM $table_track_e_attempt
                        WHERE exe_id = '".$item['exe_id']."'";
                Database::query($sql);
                $i++;
            }
        }

        // delete TRACK_E_EXERCISES table
        $sql = "DELETE FROM $table_track_e_exercises
                WHERE
                  c_id = ".api_get_course_int_id()." AND
                  exe_exo_id = ".$this->iid." $sql_where AND
                  session_id = ".$sessionId;
        Database::query($sql);

        $this->generateStats($this->iid, api_get_course_info(), $sessionId);

        Event::addEvent(
            LOG_EXERCISE_RESULT_DELETE,
            LOG_EXERCISE_ID,
            $this->iid,
            null,
            null,
            api_get_course_int_id(),
            $sessionId
        );

        return $i;
    }

    /**
     * Copies an exercise (duplicate all questions and answers).
     */
    public function copyExercise()
    {
        $exerciseObject = $this;
        $categories = $exerciseObject->getCategoriesInExercise(true);
        // Get all questions no matter the order/category settings
        $questionList = $exerciseObject->getQuestionOrderedList();
        $sourceId = $exerciseObject->iid;
        // Force the creation of a new exercise
        $exerciseObject->updateTitle($exerciseObject->selectTitle().' - '.get_lang('Copy'));
        // Hides the new exercise
        $exerciseObject->updateStatus(false);
        $exerciseObject->updateId(0);
        $exerciseObject->sessionId = api_get_session_id();
        $courseId = api_get_course_int_id();
        $exerciseObject->save();
        $newId = $exerciseObject->selectId();
        $exerciseRelQuestionTable = Database::get_course_table(TABLE_QUIZ_TEST_QUESTION);

        $count = 1;
        $batchSize = 20;
        $em = Database::getManager();

        if ($newId && !empty($questionList)) {
            $extraField = new ExtraFieldValue('exercise');
            $extraField->copy($sourceId, $newId);

            // Question creation
            foreach ($questionList as $oldQuestionId) {
                $oldQuestionObj = Question::read($oldQuestionId, null, false);
                $newQuestionId = $oldQuestionObj->duplicate();
                if ($newQuestionId) {
                    $newQuestionObj = Question::read($newQuestionId, null, false);
                    if (isset($newQuestionObj) && $newQuestionObj) {
                        $sql = "INSERT INTO $exerciseRelQuestionTable (c_id, question_id, exercice_id, question_order)
                                VALUES ($courseId, ".$newQuestionId.", ".$newId.", '$count')";
                        Database::query($sql);
                        $count++;

                        if (!empty($oldQuestionObj->category)) {
                            $newQuestionObj->saveCategory($oldQuestionObj->category);
                        }

                        // This should be moved to the duplicate function
                        $newAnswerObj = new Answer($oldQuestionId, $courseId, $exerciseObject);
                        $newAnswerObj->read();
                        $newAnswerObj->duplicate($newQuestionObj);

                        if (($count % $batchSize) === 0) {
                            $em->clear(); // Detaches all objects from Doctrine!
                        }
                    }
                }
            }
            if (!empty($categories)) {
                $newCategoryList = [];
                foreach ($categories as $category) {
                    $newCategoryList[$category['category_id']] = $category['count_questions'];
                }
                $exerciseObject->save_categories_in_exercise($newCategoryList);
            }
        }
    }

    /**
     * Changes the exercise status.
     *
     * @param string $status - exercise status
     */
    public function updateStatus($status)
    {
        $this->active = $status;
    }

    /**
     * Get the contents of the track_e_exercises table for the current
     * exercise object, in the specific context (if defined) of a
     * learning path and optionally a current progress status.
     *
     * @param int    $lp_id
     * @param int    $lp_item_id
     * @param int    $lp_item_view_id
     * @param string $status
     *
     * @return array
     */
    public function get_stat_track_exercise_info(
        $lp_id = 0,
        $lp_item_id = 0,
        $lp_item_view_id = 0,
        $status = 'incomplete'
    ) {
        $track_exercises = Database::get_main_table(TABLE_STATISTIC_TRACK_E_EXERCISES);
        if (empty($lp_id)) {
            $lp_id = 0;
        }
        if (empty($lp_item_id)) {
            $lp_item_id = 0;
        }
        if (empty($lp_item_view_id)) {
            $lp_item_view_id = 0;
        }
        $condition = ' WHERE exe_exo_id 	= '.$this->iid.' AND
					   exe_user_id 			= '.api_get_user_id().' AND
					   c_id                 = '.api_get_course_int_id().' AND
					   status 				= \''.Database::escape_string($status).'\' AND
					   orig_lp_id 			= \''.$lp_id.'\' AND
					   orig_lp_item_id 		= \''.$lp_item_id.'\' AND
                       orig_lp_item_view_id = \''.$lp_item_view_id.'\' AND
					   session_id 			= \''.api_get_session_id().'\' LIMIT 1'; //Adding limit 1 just in case

        $sql_track = 'SELECT * FROM '.$track_exercises.$condition;

        $result = Database::query($sql_track);
        $new_array = [];
        if (Database::num_rows($result) > 0) {
            $new_array = Database::fetch_array($result, 'ASSOC');
            $new_array['num_exe'] = Database::num_rows($result);
        }

        return $new_array;
    }

    /**
     * Saves a test attempt.
     *
     * @param int $clock_expired_time clock_expired_time
     * @param int  int lp id
     * @param int  int lp item id
     * @param int  int lp item_view id
     * @param array $questionList
     * @param float $weight
     *
     * @return int
     */
    public function save_stat_track_exercise_info(
        $clock_expired_time = 0,
        $safe_lp_id = 0,
        $safe_lp_item_id = 0,
        $safe_lp_item_view_id = 0,
        $questionList = [],
        $weight = 0
    ) {
        $track_exercises = Database::get_main_table(TABLE_STATISTIC_TRACK_E_EXERCISES);
        $safe_lp_id = (int) $safe_lp_id;
        $safe_lp_item_id = (int) $safe_lp_item_id;
        $safe_lp_item_view_id = (int) $safe_lp_item_view_id;

        if (empty($clock_expired_time)) {
            $clock_expired_time = null;
        }

        $questionList = array_map('intval', $questionList);

        $params = [
            'exe_exo_id' => $this->iid,
            'exe_user_id' => api_get_user_id(),
            'c_id' => api_get_course_int_id(),
            'status' => 'incomplete',
            'session_id' => api_get_session_id(),
            'data_tracking' => implode(',', $questionList),
            'start_date' => api_get_utc_datetime(),
            'orig_lp_id' => $safe_lp_id,
            'orig_lp_item_id' => $safe_lp_item_id,
            'orig_lp_item_view_id' => $safe_lp_item_view_id,
            'exe_weighting' => $weight,
            'user_ip' => Database::escape_string(api_get_real_ip()),
            'exe_date' => api_get_utc_datetime(),
            'exe_result' => 0,
            'steps_counter' => 0,
            'exe_duration' => 0,
            'expired_time_control' => $clock_expired_time,
            'questions_to_check' => '',
        ];

        return Database::insert($track_exercises, $params);
    }

    /**
     * @param int    $question_id
     * @param int    $questionNum
     * @param array  $questions_in_media
     * @param string $currentAnswer
     * @param array  $myRemindList
     * @param bool   $showPreviousButton
     *
     * @return string
     */
    public function show_button(
        $question_id,
        $questionNum,
        $questions_in_media = [],
        $currentAnswer = '',
        $myRemindList = [],
        $showPreviousButton = true,
        int $lpId = 0,
        int $lpItemId = 0,
        int $lpItemViewId = 0
    ) {
        $nbrQuestions = $this->countQuestionsInExercise();
        $buttonList = [];
        $html = $label = '';
        $hotspotGet = isset($_POST['hotspot']) ? Security::remove_XSS($_POST['hotspot']) : null;

        if (in_array($this->getFeedbackType(), [EXERCISE_FEEDBACK_TYPE_DIRECT, EXERCISE_FEEDBACK_TYPE_POPUP]) &&
            $this->type == ONE_PER_PAGE
        ) {
            $urlTitle = get_lang('ContinueTest');
            if ($questionNum == count($this->questionList)) {
                $urlTitle = get_lang('EndTest');
            }

            $url = api_get_path(WEB_CODE_PATH).'exercise/exercise_submit_modal.php?'.api_get_cidreq();
            $url .= '&'.http_build_query([
                'learnpath_id' => $lpId,
                'learnpath_item_id' => $lpItemId,
                'learnpath_item_view_id' => $lpItemViewId,
                'hotspot' => $hotspotGet,
                'nbrQuestions' => $nbrQuestions,
                'num' => $questionNum,
                'exerciseType' => $this->type,
                'exerciseId' => $this->iid,
                'reminder' => empty($myRemindList) ? null : 2,
                'tryagain' => isset($_REQUEST['tryagain']) && 1 === (int) $_REQUEST['tryagain'] ? 1 : 0,
            ]);

            $params = [
                'class' => 'ajax btn btn-default no-close-button',
                'data-title' => Security::remove_XSS(get_lang('Comment')),
                'data-size' => 'md',
                'id' => "button_$question_id",
            ];

            if ($this->getFeedbackType() === EXERCISE_FEEDBACK_TYPE_POPUP) {
                $params['data-block-closing'] = 'true';
                $params['class'] .= ' no-header ';
            }

            $html .= Display::url($urlTitle, $url, $params);
            $html .= '<br />';

            return $html;
        }

        if (!api_is_allowed_to_session_edit()) {
            return '';
        }

        $isReviewingAnswers = isset($_REQUEST['reminder']) && 2 === (int) $_REQUEST['reminder'];
        $endReminderValue = false;
        if (!empty($myRemindList) && $isReviewingAnswers) {
            $endValue = end($myRemindList);
            if ($endValue == $question_id) {
                $endReminderValue = true;
            }
        }
        $endTest = false;
        if ($this->type == ALL_ON_ONE_PAGE || $nbrQuestions == $questionNum || $endReminderValue) {
            if ($this->review_answers) {
                $label = get_lang('ReviewQuestions');
                $class = 'btn btn-success';
            } else {
                $endTest = true;
                $label = get_lang('EndTest');
                $class = 'btn btn-warning';
            }
        } else {
            $label = get_lang('NextQuestion');
            $class = 'btn btn-primary';
        }
        // used to select it with jquery
        $class .= ' question-validate-btn';
        if ($this->type == ONE_PER_PAGE) {
            if ($questionNum != 1 && $this->showPreviousButton()) {
                $prev_question = $questionNum - 2;
                $showPreview = true;
                if (!empty($myRemindList) && $isReviewingAnswers) {
                    $beforeId = null;
                    for ($i = 0; $i < count($myRemindList); $i++) {

It seems like you are calling the size function count() as part of the test condition. You might want to compute the size beforehand, and not on each iteration.

                        if (isset($myRemindList[$i]) && $myRemindList[$i] == $question_id) {
                            $beforeId = isset($myRemindList[$i - 1]) ? $myRemindList[$i - 1] : null;
                            break;
                        }
                    }

                    if (empty($beforeId)) {
                        $showPreview = false;
                    } else {
                        $num = 0;
                        foreach ($this->questionList as $originalQuestionId) {
                            if ($originalQuestionId == $beforeId) {
                                break;
                            }
                            $num++;
                        }
                        $prev_question = $num;
                    }
                }

                if ($showPreviousButton && $showPreview && 0 === $this->getPreventBackwards()) {
                    $buttonList[] = Display::button(
                        'previous_question_and_save',
                        get_lang('PreviousQuestion'),
                        [
                            'type' => 'button',
                            'class' => 'btn btn-default',
                            'data-prev' => $prev_question,
                            'data-question' => $question_id,
                        ]
                    );
                }
            }

            // Next question
            if (!empty($questions_in_media)) {
                $buttonList[] = Display::button(
                    'save_question_list',
                    $label,
                    [
                        'type' => 'button',
                        'class' => $class,
                        'data-list' => implode(",", $questions_in_media),
                    ]
                );
            } else {
                $attributes = ['type' => 'button', 'class' => $class, 'data-question' => $question_id];
                $name = 'save_now';
                if ($endTest && api_get_configuration_value('quiz_check_all_answers_before_end_test')) {
                    $name = 'check_answers';
                }
                $buttonList[] = Display::button(
                    $name,
                    $label,
                    $attributes
                );
            }
            $buttonList[] = '<span id="save_for_now_'.$question_id.'" class="exercise_save_mini_message"></span>';

            $html .= implode(PHP_EOL, $buttonList).PHP_EOL;

            return $html;
        }

        if ($this->review_answers) {
            $all_label = get_lang('ReviewQuestions');
            $class = 'btn btn-success';
        } else {
            $all_label = get_lang('EndTest');
            $class = 'btn btn-warning';
        }
        // used to select it with jquery
        $class .= ' question-validate-btn';
        $buttonList[] = Display::button(
            'validate_all',
            $all_label,
            ['type' => 'button', 'class' => $class]
        );
        $buttonList[] = Display::span(null, ['id' => 'save_all_response']);
        $html .= implode(PHP_EOL, $buttonList).PHP_EOL;

        return $html;
    }

    /**
     * @param int    $timeLeft in seconds
     * @param string $url
     *
     * @return string
     */
    public function showSimpleTimeControl($timeLeft, $url = '')
    {
        $timeLeft = (int) $timeLeft;

        return "<script>
            function openClockWarning() {
                $('#clock_warning').dialog({
                    modal:true,
                    height:320,
                    width:550,
                    closeOnEscape: false,
                    resizable: false,
                    buttons: {
                        '".addslashes(get_lang('Close'))."': function() {
                            $('#clock_warning').dialog('close');
                        }
                    },
                    close: function() {
                        window.location.href = '$url';
                    }
                });
                $('#clock_warning').dialog('open');
                $('#counter_to_redirect').epiclock({
                    mode: $.epiclock.modes.countdown,
                    offset: {seconds: 5},
                    format: 's'
                }).bind('timer', function () {
                    window.location.href = '$url';
                });
            }

            function onExpiredTimeExercise() {
                $('#wrapper-clock').hide();
                $('#expired-message-id').show();
                // Fixes bug #5263
                $('#num_current_id').attr('value', '".$this->selectNbrQuestions()."');
                openClockWarning();
            }

			$(function() {
				// time in seconds when using minutes there are some seconds lost
                var time_left = parseInt(".$timeLeft.");
                $('#exercise_clock_warning').epiclock({
                    mode: $.epiclock.modes.countdown,
                    offset: {seconds: time_left},
                    format: 'x:i:s',
                    renderer: 'minute'
                }).bind('timer', function () {
                    onExpiredTimeExercise();
                });
	       		$('#submit_save').click(function () {});
	        });
	    </script>";
    }

    /**
     * So the time control will work.
     *
     * @param int    $timeLeft
     * @param string $redirectToUrl
     *
     * @return string
     */
    public function showTimeControlJS($timeLeft, $redirectToUrl = '')
    {
        $timeLeft = (int) $timeLeft;
        $script = 'redirectExerciseToResult();';
        if (ALL_ON_ONE_PAGE == $this->type) {
            $script = "save_now_all('validate');";
        } elseif (ONE_PER_PAGE == $this->type) {
            $script = 'window.quizTimeEnding = true;
                $(\'[name="save_now"]\').trigger(\'click\');';
        }

        $exerciseSubmitRedirect = '';
        if (!empty($redirectToUrl)) {
            $exerciseSubmitRedirect = "window.location = '$redirectToUrl'";
        }

        return "<script>
            function openClockWarning() {
                $('#clock_warning').dialog({
                    modal:true,
                    height:320,
                    width:550,
                    closeOnEscape: false,
                    resizable: false,
                    buttons: {
                        '".addslashes(get_lang('EndTest'))."': function() {
                            $('#clock_warning').dialog('close');
                        }
                    },
                    close: function() {
                        send_form();
                    }
                });

                $('#clock_warning').dialog('open');
                $('#counter_to_redirect').epiclock({
                    mode: $.epiclock.modes.countdown,
                    offset: {seconds: 5},
                    format: 's'
                }).bind('timer', function () {
                    send_form();
                });
            }

            function send_form() {
                if ($('#exercise_form').length) {
                    $script
                } else {
                    $exerciseSubmitRedirect
                    // In exercise_reminder.php
                    final_submit();
                }
            }

            function onExpiredTimeExercise() {
                $('#wrapper-clock').hide();
                $('#expired-message-id').show();
                // Fixes bug #5263
                $('#num_current_id').attr('value', '".$this->selectNbrQuestions()."');
                openClockWarning();
            }

			$(function() {
				// time in seconds when using minutes there are some seconds lost
                var time_left = parseInt(".$timeLeft.");
                $('#exercise_clock_warning').epiclock({
                    mode: $.epiclock.modes.countdown,
                    offset: {seconds: time_left},
                    format: 'x:C:s',
                    renderer: 'minute'
                }).bind('timer', function () {
                    onExpiredTimeExercise();
                });
	       		$('#submit_save').click(function () {});
	        });
	    </script>";
    }

    /**
     * Prepare, calculate result and save answer to the database by calling
     * Event::saveQuestionAttempt() once everything is ready.
     *
     * @param int    $exeId
     * @param int    $questionId
     * @param mixed  $choice                                    the user-selected option
     * @param string $from                                      function is called from 'exercise_show' or 'exercise_result'
     * @param array  $exerciseResultCoordinates                 the hotspot coordinates $hotspot[$question_id] = coordinates
     * @param bool   $save_results                              save results in the DB or just show the response
     * @param bool   $from_database                             gets information from DB or from the current selection
     * @param bool   $show_result                               show results or not
     * @param int    $propagate_neg
     * @param array  $hotspot_delineation_result
     * @param bool   $showTotalScoreAndUserChoicesInLastAttempt
     * @param bool   $updateResults
     * @param bool   $showHotSpotDelineationTable
     * @param int    $questionDuration                          seconds
     *
     * @return array|false
     */
    public function manage_answer(
        $exeId,
        $questionId,
        $choice,
        $from = 'exercise_show',
        $exerciseResultCoordinates = [],
        $save_results = true,
        $from_database = false,
        $show_result = true,
        $propagate_neg = 0,
        $hotspot_delineation_result = [],
        $showTotalScoreAndUserChoicesInLastAttempt = true,
        $updateResults = false,
        $showHotSpotDelineationTable = false,
        $questionDuration = 0
    ) {
        $debug = false;
        //needed in order to use in the exercise_attempt() for the time
        global $learnpath_id, $learnpath_item_id;
        require_once api_get_path(LIBRARY_PATH).'geometry.lib.php';
        $em = Database::getManager();
        $feedback_type = $this->getFeedbackType();
        $results_disabled = $this->selectResultsDisabled();
        $questionDuration = (int) $questionDuration;

        if ($debug) {
            error_log("<------ manage_answer ------> ");
            error_log('exe_id: '.$exeId);
            error_log('$from:  '.$from);
            error_log('$save_results: '.intval($save_results));
            error_log('$from_database: '.intval($from_database));
            error_log('$show_result: '.intval($show_result));
            error_log('$propagate_neg: '.$propagate_neg);
            error_log('$exerciseResultCoordinates: '.print_r($exerciseResultCoordinates, 1));
            error_log('$hotspot_delineation_result: '.print_r($hotspot_delineation_result, 1));
            error_log('$learnpath_id: '.$learnpath_id);
            error_log('$learnpath_item_id: '.$learnpath_item_id);
            error_log('$choice: '.print_r($choice, 1));
            error_log('-----------------------------');
        }

        $final_overlap = 0;
        $final_missing = 0;
        $final_excess = 0;
        $overlap_color = 0;
        $missing_color = 0;
        $excess_color = 0;
        $threadhold1 = 0;
        $threadhold2 = 0;
        $threadhold3 = 0;
        $arrques = null;
        $arrans = null;
        $studentChoice = null;
        $expectedAnswer = '';
        $calculatedChoice = '';
        $calculatedStatus = '';
        $questionId = (int) $questionId;
        $exeId = (int) $exeId;
        $TBL_TRACK_ATTEMPT = Database::get_main_table(TABLE_STATISTIC_TRACK_E_ATTEMPT);
        $table_ans = Database::get_course_table(TABLE_QUIZ_ANSWER);
        $studentChoiceDegree = null;

        // Creates a temporary Question object
        $course_id = $this->course_id;
        $objQuestionTmp = Question::read($questionId, $this->course);

        if (false === $objQuestionTmp) {
            return false;
        }

        $questionName = $objQuestionTmp->selectTitle();
        $questionWeighting = $objQuestionTmp->selectWeighting();
        $answerType = $objQuestionTmp->selectType();
        $quesId = $objQuestionTmp->selectId();
        $extra = $objQuestionTmp->extra;
        $next = 1; //not for now
        $totalWeighting = 0;
        $totalScore = 0;

        // Extra information of the question
        if ((
            $answerType == MULTIPLE_ANSWER_TRUE_FALSE ||
            $answerType == MULTIPLE_ANSWER_TRUE_FALSE_DEGREE_CERTAINTY
            )
            && !empty($extra)
        ) {
            $extra = explode(':', $extra);
            // Fixes problems with negatives values using intval
            $true_score = (float) trim($extra[0]);
            $false_score = (float) trim($extra[1]);
            $doubt_score = (float) trim($extra[2]);
        }

        // Construction of the Answer object
        $objAnswerTmp = new Answer($questionId, $course_id);
        $nbrAnswers = $objAnswerTmp->selectNbrAnswers();

        if ($debug) {
            error_log('Count of possible answers: '.$nbrAnswers);
            error_log('$answerType: '.$answerType);
        }

        if ($answerType == MULTIPLE_ANSWER_TRUE_FALSE_DEGREE_CERTAINTY) {
            $choiceTmp = $choice;
            $choice = $choiceTmp['choice'] ?? '';
            $choiceDegreeCertainty = $choiceTmp['choiceDegreeCertainty'] ?? '';
        }

        if ($answerType == FREE_ANSWER ||
            $answerType == ORAL_EXPRESSION ||
            $answerType == CALCULATED_ANSWER ||
            $answerType == ANNOTATION ||
            $answerType == UPLOAD_ANSWER ||
            $answerType == ANSWER_IN_OFFICE_DOC
        ) {
            $nbrAnswers = 1;
        }

        $generatedFile = '';
        if ($answerType == ORAL_EXPRESSION) {
            $exe_info = Event::get_exercise_results_by_attempt($exeId);
            $exe_info = $exe_info[$exeId] ?? null;
            $objQuestionTmp->initFile(
                api_get_session_id(),
                $exe_info['exe_user_id'] ?? api_get_user_id(),
                $exe_info['exe_exo_id'] ?? $this->iid,
                $exe_info['exe_id'] ?? $exeId
            );

            // Probably this attempt came in an exercise all question by page
            if ($feedback_type == 0) {
                $objQuestionTmp->replaceWithRealExe($exeId);
            }
            $generatedFile = $objQuestionTmp->getFileUrl();
        }

        $user_answer = '';
        // Get answer list for matching.
        $sql = "SELECT iid, answer
                FROM $table_ans
                WHERE question_id = $questionId";
        $res_answer = Database::query($sql);

        $answerMatching = [];
        while ($real_answer = Database::fetch_array($res_answer)) {
            $answerMatching[$real_answer['iid']] = $real_answer['answer'];
        }

        // Get first answer needed for global question, no matter the answer shuffle option;
        $firstAnswer = [];
        if ($answerType == MULTIPLE_ANSWER_COMBINATION ||
            $answerType == MULTIPLE_ANSWER_COMBINATION_TRUE_FALSE
        ) {
            $sql = "SELECT *
                    FROM $table_ans
                    WHERE question_id = $questionId
                    ORDER BY position
                    LIMIT 1";
            $result = Database::query($sql);
            if (Database::num_rows($result)) {
                $firstAnswer = Database::fetch_array($result);
            }
        }

        $real_answers = [];
        $quiz_question_options = Question::readQuestionOption($questionId, $course_id);
        $organs_at_risk_hit = 0;
        $questionScore = 0;
        $orderedHotSpots = [];
        if (in_array($answerType, [HOT_SPOT_COMBINATION, HOT_SPOT, ANNOTATION])) {
            $orderedHotSpots = $em->getRepository('ChamiloCoreBundle:TrackEHotspot')->findBy(
                [
                    'hotspotQuestionId' => $questionId,
                    'cId' => $course_id,
                    'hotspotExeId' => $exeId,
                ],
                ['hotspotAnswerId' => 'ASC']
            );
        }

        if (in_array($answerType, [MULTIPLE_ANSWER_DROPDOWN, MULTIPLE_ANSWER_DROPDOWN_COMBINATION])) {
            if (MULTIPLE_ANSWER_DROPDOWN_COMBINATION == $answerType) {
                $questionScore = $questionWeighting;
            }

            if ($from_database) {
                $studentChoices = Database::store_result(
                    Database::query(
                        "SELECT answer FROM $TBL_TRACK_ATTEMPT WHERE exe_id = $exeId AND question_id = $questionId"
                    ),
                    'ASSOC'
                );
                $studentChoices = array_column($studentChoices, 'answer');
            } else {
                $studentChoices = array_values($choice);
            }

            $correctChoices = array_filter(
                $answerMatching,
                function ($answerId) use ($objAnswerTmp) {
                    $index = array_search($answerId, $objAnswerTmp->iid);

                    return true === (bool) $objAnswerTmp->correct[$index];
                },
                ARRAY_FILTER_USE_KEY
            );

            $correctChoices = array_keys($correctChoices);

            if (MULTIPLE_ANSWER_DROPDOWN_COMBINATION == $answerType
                && (array_diff($studentChoices, $correctChoices) || array_diff($correctChoices, $studentChoices))
            ) {
                $questionScore = 0;
            }

            if ($show_result) {
                echo ExerciseShowFunctions::displayMultipleAnswerDropdown(
                    $this,
                    $objAnswerTmp,
                    $correctChoices,
                    $studentChoices,
                    $showTotalScoreAndUserChoicesInLastAttempt
                );
            }
        }

        if ($debug) {
            error_log('-- Start answer loop --');
        }

        $answerDestination = null;
        $userAnsweredQuestion = false;
        $correctAnswerId = [];
        $matchingCorrectAnswers = [];
        for ($answerId = 1; $answerId <= $nbrAnswers; $answerId++) {
            $answer = $objAnswerTmp->selectAnswer($answerId);
            $hideComment = (int) $this->getPageConfigurationAttribute('hide_comment');
            if (1 === $hideComment) {
                $answerComment = null;
            } else {
                $answerComment = $objAnswerTmp->selectComment($answerId);
            }
            $answerCorrect = $objAnswerTmp->isCorrect($answerId);
            $answerWeighting = (float) $objAnswerTmp->selectWeighting($answerId);
            $answerAutoId = $objAnswerTmp->selectId($answerId);
            $answerIid = isset($objAnswerTmp->iid[$answerId]) ? (int) $objAnswerTmp->iid[$answerId] : 0;

            if ($debug) {
                error_log("c_quiz_answer.iid: $answerAutoId ");
                error_log("Answer marked as correct in db (0/1)?: $answerCorrect ");
                error_log("answerWeighting: $answerWeighting");
            }

            // Delineation.
            $delineation_cord = $objAnswerTmp->selectHotspotCoordinates(1);
            $answer_delineation_destination = $objAnswerTmp->selectDestination(1);

            switch ($answerType) {
                case UNIQUE_ANSWER:
                case UNIQUE_ANSWER_IMAGE:
                case UNIQUE_ANSWER_NO_OPTION:
                case READING_COMPREHENSION:
                    if ($from_database) {
                        $sql = "SELECT answer FROM $TBL_TRACK_ATTEMPT
                                WHERE
                                    exe_id = $exeId AND
                                    question_id = $questionId";
                        $result = Database::query($sql);
                        $choice = Database::result($result, 0, 'answer');

                        if (false === $userAnsweredQuestion) {
                            $userAnsweredQuestion = !empty($choice);
                        }
                        $studentChoice = $choice == $answerAutoId ? 1 : 0;
                        if ($studentChoice) {
                            $questionScore += $answerWeighting;
                            $answerDestination = $objAnswerTmp->selectDestination($answerId);
                            $correctAnswerId[] = $answerId;
                        }
                    } else {
                        $studentChoice = $choice == $answerAutoId ? 1 : 0;
                        if ($studentChoice) {
                            $questionScore += $answerWeighting;
                            $answerDestination = $objAnswerTmp->selectDestination($answerId);
                            $correctAnswerId[] = $answerAutoId;
                        }
                    }
                    break;
                case MULTIPLE_ANSWER_TRUE_FALSE:
                    if ($from_database) {
                        $choice = [];
                        $sql = "SELECT answer FROM $TBL_TRACK_ATTEMPT
                                WHERE
                                    exe_id = $exeId AND
                                    question_id = ".$questionId;

                        $result = Database::query($sql);
                        while ($row = Database::fetch_array($result)) {
                            $values = explode(':', $row['answer']);
                            $my_answer_id = isset($values[0]) ? $values[0] : '';
                            $option = isset($values[1]) ? $values[1] : '';
                            $choice[$my_answer_id] = $option;
                        }
                        $userAnsweredQuestion = !empty($choice);
                    }

                    $studentChoice = $choice[$answerAutoId] ?? null;
                    if (isset($studentChoice)) {
                        $correctAnswerId[] = $answerAutoId;
                        if ($studentChoice == $answerCorrect) {
                            $questionScore += $true_score;
                        } else {
                            if ($quiz_question_options[$studentChoice]['name'] === "Don't know" ||
                                $quiz_question_options[$studentChoice]['name'] === "DoubtScore"
                            ) {
                                $questionScore += $doubt_score;
                            } else {
                                $questionScore += $false_score;
                            }
                        }
                    } else {
                        // If no result then the user just hit don't know
                        $studentChoice = 3;
                        $questionScore += $doubt_score;
                    }
                    $totalScore = $questionScore;
                    break;
                case MULTIPLE_ANSWER_TRUE_FALSE_DEGREE_CERTAINTY:
                    if ($from_database) {
                        $choice = [];
                        $choiceDegreeCertainty = [];
                        $sql = "SELECT answer
                            FROM $TBL_TRACK_ATTEMPT
                            WHERE
                            exe_id = $exeId AND question_id = $questionId";

                        $result = Database::query($sql);
                        while ($row = Database::fetch_array($result)) {
                            $ind = $row['answer'];
                            $values = explode(':', $ind);
                            $myAnswerId = $values[0];
                            $option = $values[1];
                            $percent = $values[2];
                            $choice[$myAnswerId] = $option;
                            $choiceDegreeCertainty[$myAnswerId] = $percent;
                        }
                    }

                    $studentChoice = $choice[$answerAutoId] ?? null;
                    $studentChoiceDegree = $choiceDegreeCertainty[$answerAutoId] ?? null;

                    // student score update
                    if (!empty($studentChoice)) {
                        if ($studentChoice == $answerCorrect) {
                            // correct answer and student is Unsure or PrettySur
                            if (isset($quiz_question_options[$studentChoiceDegree]) &&
                                $quiz_question_options[$studentChoiceDegree]['position'] >= 3 &&
                                $quiz_question_options[$studentChoiceDegree]['position'] < 9
                            ) {
                                $questionScore += $true_score;
                            } else {
                                // student ignore correct answer
                                $questionScore += $doubt_score;
                            }
                        } else {
                            // false answer and student is Unsure or PrettySur
                            if ($quiz_question_options[$studentChoiceDegree]['position'] >= 3
                                && $quiz_question_options[$studentChoiceDegree]['position'] < 9) {
                                $questionScore += $false_score;
                            } else {
                                // student ignore correct answer
                                $questionScore += $doubt_score;
                            }
                        }
                    }
                    $totalScore = $questionScore;
                    break;
                case MULTIPLE_ANSWER:
                case MULTIPLE_ANSWER_DROPDOWN:
                    if ($from_database) {
                        $choice = [];
                        $sql = "SELECT answer FROM $TBL_TRACK_ATTEMPT
                                WHERE exe_id = $exeId AND question_id = $questionId ";
                        $resultans = Database::query($sql);
                        while ($row = Database::fetch_array($resultans)) {
                            $choice[$row['answer']] = 1;
                        }

                        $studentChoice = $choice[$answerAutoId] ?? null;
                        $real_answers[$answerId] = (bool) $studentChoice;

                        if ($studentChoice) {
                            $questionScore += $answerWeighting;
                        }
                    } else {
                        $studentChoice = $choice[$answerAutoId] ?? null;
                        $real_answers[$answerId] = (bool) $studentChoice;

                        if (isset($studentChoice)
                            || (MULTIPLE_ANSWER_DROPDOWN == $answerType && in_array($answerAutoId, $choice))
                        ) {
                            $correctAnswerId[] = $answerAutoId;
                            $questionScore += $answerWeighting;
                        }
                    }
                    $totalScore += $answerWeighting;
                    break;
                case GLOBAL_MULTIPLE_ANSWER:
                    if ($from_database) {
                        $choice = [];
                        $sql = "SELECT answer FROM $TBL_TRACK_ATTEMPT
                                WHERE exe_id = $exeId AND question_id = $questionId ";
                        $resultans = Database::query($sql);
                        while ($row = Database::fetch_array($resultans)) {
                            $choice[$row['answer']] = 1;
                        }
                        $studentChoice = $choice[$answerAutoId] ?? null;
                        $real_answers[$answerId] = (bool) $studentChoice;
                        if ($studentChoice) {
                            $questionScore += $answerWeighting;
                        }
                    } else {
                        $studentChoice = $choice[$answerAutoId] ?? null;
                        if (isset($studentChoice)) {
                            $questionScore += $answerWeighting;
                        }
                        $real_answers[$answerId] = (bool) $studentChoice;
                    }
                    $totalScore += $answerWeighting;
                    if ($debug) {
                        error_log("studentChoice: $studentChoice");
                    }
                    break;
                case MULTIPLE_ANSWER_COMBINATION_TRUE_FALSE:
                    if ($from_database) {
                        $choice = [];
                        $sql = "SELECT answer FROM $TBL_TRACK_ATTEMPT
                                WHERE exe_id = $exeId AND question_id = $questionId";
                        $resultans = Database::query($sql);
                        while ($row = Database::fetch_array($resultans)) {
                            $result = explode(':', $row['answer']);
                            if (isset($result[0])) {
                                $my_answer_id = isset($result[0]) ? $result[0] : '';
                                $option = isset($result[1]) ? $result[1] : '';
                                $choice[$my_answer_id] = $option;
                            }
                        }
                        $studentChoice = $choice[$answerAutoId] ?? '';
                        $real_answers[$answerId] = false;
                        if ($answerCorrect == $studentChoice) {
                            $real_answers[$answerId] = true;
                        }
                    } else {
                        $studentChoice = $choice[$answerAutoId] ?? '';
                        $real_answers[$answerId] = false;
                        if ($answerCorrect == $studentChoice) {
                            $real_answers[$answerId] = true;
                        }
                    }
                    break;
                case MULTIPLE_ANSWER_COMBINATION:
                    if ($from_database) {
                        $choice = [];
                        $sql = "SELECT answer FROM $TBL_TRACK_ATTEMPT
                                WHERE exe_id = $exeId AND question_id = $questionId";
                        $resultans = Database::query($sql);
                        while ($row = Database::fetch_array($resultans)) {
                            $choice[$row['answer']] = 1;
                        }

                        $studentChoice = $choice[$answerAutoId] ?? null;
                        if (1 == $answerCorrect) {
                            $real_answers[$answerId] = false;
                            if ($studentChoice) {
                                $real_answers[$answerId] = true;
                            }
                        } else {
                            $real_answers[$answerId] = true;
                            if ($studentChoice) {
                                $real_answers[$answerId] = false;
                            }
                        }
                    } else {
                        $studentChoice = $choice[$answerAutoId] ?? null;
                        if (1 == $answerCorrect) {
                            $real_answers[$answerId] = false;
                            if ($studentChoice) {
                                $real_answers[$answerId] = true;
                            }
                        } else {
                            $real_answers[$answerId] = true;
                            if ($studentChoice) {
                                $real_answers[$answerId] = false;
                            }
                        }
                    }
                    break;
                case FILL_IN_BLANKS:
                case FILL_IN_BLANKS_COMBINATION:
                    $str = '';
                    $answerFromDatabase = '';
                    if ($from_database) {
                        $sql = "SELECT answer
                                FROM $TBL_TRACK_ATTEMPT
                                WHERE
                                    exe_id = $exeId AND
                                    question_id= $questionId ";
                        $result = Database::query($sql);
                        $str = $answerFromDatabase = Database::result($result, 0, 'answer');
                    }

                    // if ($save_results == false && strpos($answerFromDatabase, 'font color') !== false) {
                    if (false) {
                        // the question is encoded like this
                        // [A] B [C] D [E] F::10,10,10@1
                        // number 1 before the "@" means that is a switchable fill in blank question
                        // [A] B [C] D [E] F::10,10,10@ or  [A] B [C] D [E] F::10,10,10
                        // means that is a normal fill blank question
                        // first we explode the "::"
                        $pre_array = explode('::', $answer);

                        // is switchable fill blank or not
                        $last = count($pre_array) - 1;
                        $is_set_switchable = explode('@', $pre_array[$last]);
                        $switchable_answer_set = false;
                        if (isset($is_set_switchable[1]) && 1 == $is_set_switchable[1]) {
                            $switchable_answer_set = true;
                        }
                        $answer = '';
                        for ($k = 0; $k < $last; $k++) {
                            $answer .= $pre_array[$k];
                        }
                        // splits weightings that are joined with a comma
                        $answerWeighting = explode(',', $is_set_switchable[0]);
                        // we save the answer because it will be modified
                        $temp = $answer;
                        $answer = '';
                        $j = 0;
                        //initialise answer tags
                        $user_tags = $correct_tags = $real_text = [];
                        // the loop will stop at the end of the text
                        while (1) {
                            // quits the loop if there are no more blanks (detect '[')
                            if ($temp == false || ($pos = api_strpos($temp, '[')) === false) {
                                // adds the end of the text
                                $answer = $temp;
                                $real_text[] = $answer;
                                break; //no more "blanks", quit the loop
                            }
                            // adds the piece of text that is before the blank
                            //and ends with '[' into a general storage array
                            $real_text[] = api_substr($temp, 0, $pos + 1);
                            $answer .= api_substr($temp, 0, $pos + 1);
                            //take the string remaining (after the last "[" we found)
                            $temp = api_substr($temp, $pos + 1);
                            // quit the loop if there are no more blanks, and update $pos to the position of next ']'
                            if (($pos = api_strpos($temp, ']')) === false) {
                                // adds the end of the text
                                $answer .= $temp;
                                break;
                            }
                            if ($from_database) {
                                $str = $answerFromDatabase;
                                api_preg_match_all('#\[([^[]*)\]#', $str, $arr);
                                $str = str_replace('\r\n', '', $str);

                                $choice = $arr[1];
                                if (isset($choice[$j])) {
                                    $tmp = api_strrpos($choice[$j], ' / ');
                                    $choice[$j] = api_substr($choice[$j], 0, $tmp);
                                    $choice[$j] = trim($choice[$j]);
                                    // Needed to let characters ' and " to work as part of an answer
                                    $choice[$j] = stripslashes($choice[$j]);
                                } else {
                                    $choice[$j] = null;
                                }
                            } else {
                                // This value is the user input, not escaped while correct answer is escaped by ckeditor
                                $choice[$j] = api_htmlentities(trim($choice[$j]));
                            }

                            $user_tags[] = $choice[$j];
                            // Put the contents of the [] answer tag into correct_tags[]
                            $correct_tags[] = api_substr($temp, 0, $pos);
                            $j++;
                            $temp = api_substr($temp, $pos + 1);
                        }
                        $answer = '';
                        $real_correct_tags = $correct_tags;
                        $chosen_list = [];

                        for ($i = 0; $i < count($real_correct_tags); $i++) {

It seems like you are calling the size function count() as part of the test condition. You might want to compute the size beforehand, and not on each iteration.

                            if (0 == $i) {
                                $answer .= $real_text[0];
                            }
                            if (!$switchable_answer_set) {
                                // Needed to parse ' and " characters
                                $user_tags[$i] = stripslashes($user_tags[$i]);
                                if ($correct_tags[$i] == $user_tags[$i]) {
                                    // gives the related weighting to the student
                                    $questionScore += $answerWeighting[$i];
                                    // increments total score
                                    $totalScore += $answerWeighting[$i];
                                    // adds the word in green at the end of the string
                                    $answer .= $correct_tags[$i];
                                } elseif (!empty($user_tags[$i])) {
                                    // else if the word entered by the student IS NOT the same as
                                    // the one defined by the professor
                                    // adds the word in red at the end of the string, and strikes it
                                    $answer .= '<font color="red"><s>'.$user_tags[$i].'</s></font>';
                                } else {
                                    // adds a tabulation if no word has been typed by the student
                                    $answer .= ''; // remove &nbsp; that causes issue
                                }
                            } else {
                                // switchable fill in the blanks
                                if (in_array($user_tags[$i], $correct_tags)) {
                                    $chosen_list[] = $user_tags[$i];
                                    $correct_tags = array_diff($correct_tags, $chosen_list);
                                    // gives the related weighting to the student
                                    $questionScore += $answerWeighting[$i];
                                    // increments total score
                                    $totalScore += $answerWeighting[$i];
                                    // adds the word in green at the end of the string
                                    $answer .= $user_tags[$i];
                                } elseif (!empty($user_tags[$i])) {
                                    // else if the word entered by the student IS NOT the same
                                    // as the one defined by the professor
                                    // adds the word in red at the end of the string, and strikes it
                                    $answer .= '<font color="red"><s>'.$user_tags[$i].'</s></font>';
                                } else {
                                    // adds a tabulation if no word has been typed by the student
                                    $answer .= ''; // remove &nbsp; that causes issue
                                }
                            }

                            // adds the correct word, followed by ] to close the blank
                            $answer .= ' / <font color="green"><b>'.$real_correct_tags[$i].'</b></font>]';
                            if (isset($real_text[$i + 1])) {
                                $answer .= $real_text[$i + 1];
                            }
                        }
                    } else {
                        // insert the student result in the track_e_attempt table, field answer
                        // $answer is the answer like in the c_quiz_answer table for the question
                        // student data are choice[]
                        $listCorrectAnswers = FillBlanks::getAnswerInfo($answer);
                        $switchableAnswerSet = $listCorrectAnswers['switchable'];
                        $answerWeighting = $listCorrectAnswers['weighting'];
                        // user choices is an array $choice

                        // get existing user data in n the BDD
                        if ($from_database) {
                            $listStudentResults = FillBlanks::getAnswerInfo(
                                $answerFromDatabase,
                                true
                            );
                            $choice = $listStudentResults['student_answer'];
                        }

                        // loop other all blanks words
                        if (!$switchableAnswerSet) {
                            // not switchable answer, must be in the same place than teacher order
                            for ($i = 0; $i < count($listCorrectAnswers['words']); $i++) {

It seems like you are calling the size function count() as part of the test condition. You might want to compute the size beforehand, and not on each iteration.

                                $studentAnswer = $choice[$i] ?? '';
                                $correctAnswer = $listCorrectAnswers['words'][$i];

                                if ($debug) {
                                    error_log("Student answer: $i");
                                    error_log($studentAnswer);
                                }

                                // This value is the user input, not escaped while correct answer is escaped by ckeditor
                                // Works with cyrillic alphabet and when using ">" chars see #7718 #7610 #7618
                                // ENT_QUOTES is used in order to transform ' to '
                                //if (!$from_database) {
                                $studentAnswer = FillBlanks::clearStudentAnswer($studentAnswer);
                                if ($debug) {
                                    error_log('Student answer cleaned:');
                                    error_log($studentAnswer);
                                }
                                //}

                                $isAnswerCorrect = 0;
                                if (FillBlanks::isStudentAnswerGood($studentAnswer, $correctAnswer, $from_database)) {
                                    // gives the related weighting to the student
                                    $questionScore += $answerWeighting[$i];
                                    // increments total score
                                    $totalScore += $answerWeighting[$i];
                                    $isAnswerCorrect = 1;
                                }
                                if ($debug) {
                                    error_log("isAnswerCorrect $i: $isAnswerCorrect");
                                }

                                $studentAnswerToShow = $studentAnswer;
                                $type = FillBlanks::getFillTheBlankAnswerType($correctAnswer);
                                if ($debug) {
                                    error_log("Fill in blank type: $type");
                                }
                                if ($type == FillBlanks::FILL_THE_BLANK_MENU) {
                                    $listMenu = FillBlanks::getFillTheBlankMenuAnswers($correctAnswer, false);
                                    if ($studentAnswer != '') {
                                        foreach ($listMenu as $item) {
                                            if (sha1($item) == $studentAnswer) {
                                                $studentAnswerToShow = $item;
                                            }
                                        }
                                    }
                                }
                                $listCorrectAnswers['student_answer'][$i] = $studentAnswerToShow;
                                $listCorrectAnswers['student_score'][$i] = $isAnswerCorrect;
                            }
                        } else {
                            // switchable answer
                            $listStudentAnswerTemp = $choice;
                            $listTeacherAnswerTemp = $listCorrectAnswers['words'];

                            // for every teacher answer, check if there is a student answer
                            for ($i = 0; $i < count($listStudentAnswerTemp); $i++) {

It seems like you are calling the size function count() as part of the test condition. You might want to compute the size beforehand, and not on each iteration.

                                $studentAnswer = trim($listStudentAnswerTemp[$i]);
                                $studentAnswerToShow = $studentAnswer;

                                if (empty($studentAnswer)) {
                                    break;
                                }

                                if ($debug) {
                                    error_log("Student answer: $i");
                                    error_log($studentAnswer);
                                }

                                if (!$from_database) {
                                    $studentAnswer = FillBlanks::clearStudentAnswer($studentAnswer);
                                    if ($debug) {
                                        error_log("Student answer cleaned:");
                                        error_log($studentAnswer);
                                    }
                                }

                                $found = false;
                                for ($j = 0; $j < count($listTeacherAnswerTemp); $j++) {

It seems like you are calling the size function count() as part of the test condition. You might want to compute the size beforehand, and not on each iteration.

                                    $correctAnswer = $listTeacherAnswerTemp[$j] ?? '';
                                    if (is_array($listTeacherAnswerTemp)) {
                                        $correctAnswer = implode('||', $listTeacherAnswerTemp);
                                    }

                                    if (empty($correctAnswer)) {
                                        break;
                                    }

                                    if (FillBlanks::isStudentAnswerGood(
                                        $studentAnswer,
                                        $correctAnswer,
                                        $from_database,
                                        true
                                    )) {
                                        $questionScore += $answerWeighting[$i];
                                        $totalScore += $answerWeighting[$i];
                                        if (is_array($listTeacherAnswerTemp)) {
                                            $searchAnswer = array_search(api_htmlentities($studentAnswer), $listTeacherAnswerTemp);
                                            if (false !== $searchAnswer) {
                                                // Remove from array
                                                unset($listTeacherAnswerTemp[$searchAnswer]);
                                            }
                                        } else {
                                            $listTeacherAnswerTemp[$j] = null;
                                        }
                                        $found = true;
                                    }

                                    if (FillBlanks::FILL_THE_BLANK_MENU != $listCorrectAnswers['words_types'][$j]) {
                                        break;
                                    }

                                    $listMenu = FillBlanks::getFillTheBlankMenuAnswers($correctAnswer, false);
                                    foreach ($listMenu as $item) {
                                        if (sha1($item) === $studentAnswer) {
                                            $studentAnswerToShow = $item;
                                        }
                                    }
                                }
                                $listCorrectAnswers['student_answer'][$i] = $studentAnswerToShow;
                                $listCorrectAnswers['student_score'][$i] = $found ? 1 : 0;
                            }
                        }
                        $answer = FillBlanks::getAnswerInStudentAttempt($listCorrectAnswers);
                    }
                    break;
                case CALCULATED_ANSWER:
                    $calculatedAnswerList = Session::read('calculatedAnswerId');
                    $calculatedAnswerId = null;
                    if (!empty($calculatedAnswerList) && isset($calculatedAnswerList[$questionId])) {
                        $calculatedAnswerId = $calculatedAnswerList[$questionId];
                        $answer = $objAnswerTmp->selectAnswer($calculatedAnswerId);
                        $preArray = explode('@@', $answer);
                        $last = count($preArray) - 1;
                        $answer = '';
                        for ($k = 0; $k < $last; $k++) {
                            $answer .= $preArray[$k];
                        }
                        $answerWeighting = [$answerWeighting];
                        // we save the answer because it will be modified
                        $temp = $answer;
                        $answer = '';
                        $j = 0;
                        // initialise answer tags
                        $userTags = $correctTags = $realText = [];
                        // the loop will stop at the end of the text
                        while (1) {
                            // quits the loop if there are no more blanks (detect '[')
                            if ($temp == false || ($pos = api_strpos($temp, '[')) === false) {
                                // adds the end of the text
                                $answer = $temp;
                                $realText[] = $answer;
                                break; //no more "blanks", quit the loop
                            }
                            // adds the piece of text that is before the blank
                            // and ends with '[' into a general storage array
                            $realText[] = api_substr($temp, 0, $pos + 1);
                            $answer .= api_substr($temp, 0, $pos + 1);
                            // take the string remaining (after the last "[" we found)
                            $temp = api_substr($temp, $pos + 1);
                            // quit the loop if there are no more blanks, and update $pos to the position of next ']'
                            if (false === ($pos = api_strpos($temp, ']'))) {
                                // adds the end of the text
                                $answer .= $temp;
                                break;
                            }

                            if ($from_database) {
                                $sql = "SELECT answer FROM $TBL_TRACK_ATTEMPT
                                        WHERE
                                            exe_id = $exeId AND
                                            question_id = $questionId ";
                                $result = Database::query($sql);
                                $str = Database::result($result, 0, 'answer');

                                api_preg_match_all('#\[([^[]*)\]#', $str, $arr);
                                $str = str_replace('\r\n', '', $str);
                                $choice = $arr[1];
                                if (isset($choice[$j])) {
                                    $tmp = api_strrpos($choice[$j], ' / ');
                                    if ($tmp) {
                                        $choice[$j] = api_substr($choice[$j], 0, $tmp);
                                    } else {
                                        $tmp = ltrim($tmp, '[');
                                        $tmp = rtrim($tmp, ']');
                                    }
                                    $choice[$j] = trim($choice[$j]);
                                    // Needed to let characters ' and " to work as part of an answer
                                    $choice[$j] = stripslashes($choice[$j]);
                                } else {
                                    $choice[$j] = null;
                                }
                            } else {
                                // This value is the user input not escaped while correct answer is escaped by ckeditor
                                $choice[$j] = api_htmlentities(trim($choice[$j]));
                            }
                            $userTags[] = $choice[$j];
                            // put the contents of the [] answer tag into correct_tags[]
                            $correctTags[] = api_substr($temp, 0, $pos);
                            $j++;
                            $temp = api_substr($temp, $pos + 1);
                        }
                        $answer = '';
                        $realCorrectTags = $correctTags;
                        $calculatedStatus = Display::label(get_lang('Incorrect'), 'danger');
                        $expectedAnswer = '';
                        $calculatedChoice = '';

                        for ($i = 0; $i < count($realCorrectTags); $i++) {

It seems like you are calling the size function count() as part of the test condition. You might want to compute the size beforehand, and not on each iteration.

                            if (0 == $i) {
                                $answer .= $realText[0];
                            }
                            // Needed to parse ' and " characters
                            $userTags[$i] = stripslashes($userTags[$i]);
                            if ($correctTags[$i] == $userTags[$i]) {
                                // gives the related weighting to the student
                                $questionScore += $answerWeighting[$i];
                                // increments total score
                                $totalScore += $answerWeighting[$i];
                                // adds the word in green at the end of the string
                                $answer .= $correctTags[$i];
                                $calculatedChoice = $correctTags[$i];
                            } elseif (!empty($userTags[$i])) {
                                // else if the word entered by the student IS NOT the same as
                                // the one defined by the professor
                                // adds the word in red at the end of the string, and strikes it
                                $answer .= '<font color="red"><s>'.$userTags[$i].'</s></font>';
                                $calculatedChoice = $userTags[$i];
                            } else {
                                // adds a tabulation if no word has been typed by the student
                                $answer .= ''; // remove &nbsp; that causes issue
                            }
                            // adds the correct word, followed by ] to close the blank
                            if (EXERCISE_FEEDBACK_TYPE_EXAM != $this->results_disabled) {
                                $answer .= ' / <font color="green"><b>'.$realCorrectTags[$i].'</b></font>';
                                $calculatedStatus = Display::label(get_lang('Correct'), 'success');
                                $expectedAnswer = $realCorrectTags[$i];
                            }
                            $answer .= ']';
                            if (isset($realText[$i + 1])) {
                                $answer .= $realText[$i + 1];
                            }
                        }
                    } else {
                        if ($from_database) {
                            $sql = "SELECT *
                                    FROM $TBL_TRACK_ATTEMPT
                                    WHERE
                                        exe_id = $exeId AND
                                        question_id = $questionId ";
                            $result = Database::query($sql);
                            $resultData = Database::fetch_array($result, 'ASSOC');
                            $answer = $resultData['answer'];
                            $questionScore = $resultData['marks'];
                        }
                    }
                    break;
                case UPLOAD_ANSWER:
                case FREE_ANSWER:
                case ANSWER_IN_OFFICE_DOC:
                    if ($from_database) {
                        $sql = "SELECT answer, marks FROM $TBL_TRACK_ATTEMPT
                                 WHERE
                                    exe_id = $exeId AND
                                    question_id= ".$questionId;
                        $result = Database::query($sql);
                        $data = Database::fetch_array($result);
                        $choice = '';
                        $questionScore = 0;
                        if ($data) {
                            $choice = $data['answer'];
                            $questionScore = $data['marks'];
                        }
                        $choice = str_replace('\r\n', '', $choice);
                        $choice = stripslashes($choice);
                        if (-1 == $questionScore) {
                            $totalScore += 0;
                        } else {
                            $totalScore += $questionScore;
                        }
                        if ('' == $questionScore) {
                            $questionScore = 0;
                        }
                        $arrques = $questionName;
                        $arrans = $choice;
                    } else {
                        $studentChoice = $choice;
                        if ($studentChoice) {
                            //Fixing negative puntation see #2193
                            $questionScore = 0;
                            $totalScore += 0;
                        }
                    }
                    break;
                case ORAL_EXPRESSION:
                    if ($from_database) {
                        $query = "SELECT answer, marks
                                  FROM $TBL_TRACK_ATTEMPT
                                  WHERE
                                        exe_id = $exeId AND
                                        question_id = $questionId
                                 ";
                        $resq = Database::query($query);
                        $row = Database::fetch_assoc($resq);

                        $choice = [
                            'answer' => '',
                            'marks' => 0,
                        ];
                        $questionScore = 0;

                        if (is_array($row)) {
                            $choice = $row['answer'];
                            $choice = str_replace('\r\n', '', $choice);
                            $choice = stripslashes($choice);
                            $questionScore = $row['marks'];
                        }

                        if ($questionScore == -1) {
                            $totalScore += 0;
                        } else {
                            $totalScore += $questionScore;
                        }
                        $arrques = $questionName;
                        $arrans = $choice;
                    } else {
                        $studentChoice = $choice;
                        if ($studentChoice) {
                            //Fixing negative puntation see #2193
                            $questionScore = 0;
                            $totalScore += 0;
                        }
                    }
                    break;
                case DRAGGABLE:
                case MATCHING_DRAGGABLE:
                case MATCHING_DRAGGABLE_COMBINATION:
                case MATCHING_COMBINATION:
                case MATCHING:
                    if ($from_database) {
                        $sql = "SELECT iid, answer, id_auto
                                FROM $table_ans
                                WHERE
                                    question_id = $questionId AND
                                    correct = 0
                                ";
                        $result = Database::query($sql);
                        // Getting the real answer
                        $real_list = [];
                        while ($realAnswer = Database::fetch_array($result)) {
                            $real_list[$realAnswer['iid']] = $realAnswer['answer'];
                        }

                        $orderBy = ' ORDER BY iid ';
                        if (DRAGGABLE == $answerType) {
                            $orderBy = ' ORDER BY correct ';
                        }

                        $sql = "SELECT iid, answer, correct, id_auto, ponderation
                                FROM $table_ans
                                WHERE
                                    question_id = $questionId AND
                                    correct <> 0
                                $orderBy";
                        $result = Database::query($sql);
                        $options = [];
                        $correctAnswers = [];
                        while ($row = Database::fetch_array($result, 'ASSOC')) {
                            $options[] = $row;
                            $correctAnswers[$row['correct']] = $row['answer'];
                        }

                        $questionScore = 0;
                        $counterAnswer = 1;
                        foreach ($options as $a_answers) {
                            $i_answer_id = $a_answers['iid']; //3
                            $s_answer_label = $a_answers['answer']; // your daddy - your mother
                            $i_answer_correct_answer = $a_answers['correct']; //1 - 2

                            $sql = "SELECT answer FROM $TBL_TRACK_ATTEMPT
                                    WHERE
                                        exe_id = '$exeId' AND
                                        question_id = '$questionId' AND
                                        position = '$i_answer_id'";
                            $result = Database::query($sql);
                            $s_user_answer = 0;
                            if (Database::num_rows($result) > 0) {
                                //  rich - good looking
                                $s_user_answer = Database::result($result, 0, 0);
                            }
                            $i_answerWeighting = $a_answers['ponderation'];
                            $user_answer = '';
                            $status = Display::label(get_lang('Incorrect'), 'danger');

                            if (!empty($s_user_answer)) {
                                if (DRAGGABLE == $answerType) {
                                    $sql = "SELECT answer FROM $table_ans WHERE iid = $s_user_answer";
                                    $rsDragAnswer = Database::query($sql);
                                    $dragAns = Database::result($rsDragAnswer, 0, 0);
                                    if ($s_user_answer == $i_answer_correct_answer) {
                                        $questionScore += $i_answerWeighting;
                                        $totalScore += $i_answerWeighting;
                                        $user_answer = Display::label(get_lang('Correct'), 'success');
                                        if ($this->showExpectedChoice() && !empty($i_answer_id)) {
                                            $user_answer = $answerMatching[$i_answer_id];
                                        } else {
                                            $user_answer = $dragAns;
                                        }
                                        $status = Display::label(get_lang('Correct'), 'success');
                                    } else {
                                        $user_answer = Display::label(get_lang('Incorrect'), 'danger');
                                        if ($this->showExpectedChoice() && !empty($s_user_answer)) {
                                            /*$data = $options[$real_list[$s_user_answer] - 1];
                                            $user_answer = $data['answer'];*/
                                            $user_answer = $correctAnswers[$s_user_answer] ?? '';
                                        } else {
                                            $user_answer = $dragAns;
                                        }
                                    }
                                } else {
                                    if ($s_user_answer == $i_answer_correct_answer) {
                                        $questionScore += $i_answerWeighting;
                                        $totalScore += $i_answerWeighting;
                                        $status = Display::label(get_lang('Correct'), 'success');
                                        // Try with id
                                        if (isset($real_list[$i_answer_id])) {
                                            $user_answer = Display::span(
                                                $real_list[$i_answer_id],
                                                ['style' => 'color: #008000; font-weight: bold;']
                                            );
                                        }

                                        // Try with $i_answer_id_auto
                                        if (empty($user_answer)) {
                                            if (isset($real_list[$i_answer_id])) {
                                                $user_answer = Display::span(
                                                    $real_list[$i_answer_id],
                                                    ['style' => 'color: #008000; font-weight: bold;']
                                                );
                                            }
                                        }

                                        if (isset($real_list[$i_answer_correct_answer])) {
                                            $matchingCorrectAnswers[$questionId]['from_database']['correct'][$i_answer_correct_answer] = $real_list[$i_answer_correct_answer];
                                            $user_answer = Display::span(
                                                $real_list[$i_answer_correct_answer],
                                                ['style' => 'color: #008000; font-weight: bold;']
                                            );
                                        }
                                    } else {
                                        $user_answer = Display::span(
                                            $real_list[$s_user_answer],
                                            ['style' => 'color: #FF0000; text-decoration: line-through;']
                                        );
                                        if ($this->showExpectedChoice()) {
                                            if (isset($real_list[$s_user_answer])) {
                                                $user_answer = Display::span($real_list[$s_user_answer]);
                                            }
                                        }
                                    }
                                }
                            } elseif (DRAGGABLE == $answerType) {
                                $user_answer = Display::label(get_lang('Incorrect'), 'danger');
                                if ($this->showExpectedChoice()) {
                                    $user_answer = '';
                                }
                            } else {
                                $user_answer = Display::span(
                                    get_lang('Incorrect').' &nbsp;',
                                    ['style' => 'color: #FF0000; text-decoration: line-through;']
                                );
                                if ($this->showExpectedChoice()) {
                                    $user_answer = '';
                                }
                            }

                            if ($show_result) {
                                if (false === $this->showExpectedChoice() &&
                                    false === $showTotalScoreAndUserChoicesInLastAttempt
                                ) {
                                    $this->hideExpectedAnswer = true;
                                }
                                switch ($answerType) {
                                    case MATCHING:
                                    case MATCHING_COMBINATION:
                                    case MATCHING_DRAGGABLE_COMBINATION:
                                    case MATCHING_DRAGGABLE:
                                        if (RESULT_DISABLE_SHOW_SCORE_ATTEMPT_SHOW_ANSWERS_LAST_ATTEMPT_NO_FEEDBACK == $this->results_disabled) {
                                            if (false === $showTotalScoreAndUserChoicesInLastAttempt && empty($s_user_answer)) {
                                                break;
                                            }
                                        }

                                        echo '<tr>';
                                        if (!in_array(
                                            $this->results_disabled,
                                            [
                                                RESULT_DISABLE_SHOW_ONLY_IN_CORRECT_ANSWER,
                                            ]
                                        )
                                        ) {
                                            echo '<td>'.$s_answer_label.'</td>';
                                            echo '<td>'.$user_answer.'</td>';
                                        } else {
                                            echo '<td>'.$s_answer_label.'</td>';
                                            $status = Display::label(get_lang('Correct'), 'success');
                                        }

                                        if ($this->showExpectedChoice()) {
                                            if ($this->showExpectedChoiceColumn()) {
                                                echo '<td>';
                                                if (in_array($answerType, [MATCHING, MATCHING_COMBINATION, MATCHING_DRAGGABLE, MATCHING_DRAGGABLE_COMBINATION])) {
                                                    if (isset($real_list[$i_answer_correct_answer]) &&
                                                        $showTotalScoreAndUserChoicesInLastAttempt == true
                                                    ) {
                                                        echo Display::span(
                                                            $real_list[$i_answer_correct_answer]
                                                        );
                                                    }
                                                }
                                                echo '</td>';
                                            }
                                            echo '<td>'.$status.'</td>';
                                        } else {
                                            if (in_array($answerType, [MATCHING, MATCHING_COMBINATION, MATCHING_DRAGGABLE, MATCHING_DRAGGABLE_COMBINATION])) {
                                                if (isset($real_list[$i_answer_correct_answer]) &&
                                                    $showTotalScoreAndUserChoicesInLastAttempt === true
                                                ) {
                                                    if ($this->showExpectedChoiceColumn()) {
                                                        echo '<td>';
                                                        echo Display::span(
                                                            $real_list[$i_answer_correct_answer],
                                                            ['style' => 'color: #008000; font-weight: bold;']
                                                        );
                                                        echo '</td>';
                                                    }
                                                }
                                            }
                                        }
                                        echo '</tr>';
                                        break;
                                    case DRAGGABLE:
                                        if (RESULT_DISABLE_SHOW_SCORE_ATTEMPT_SHOW_ANSWERS_LAST_ATTEMPT_NO_FEEDBACK == $this->results_disabled) {
                                            if (false === $showTotalScoreAndUserChoicesInLastAttempt && empty($s_user_answer)) {
                                                break;
                                            }
                                        }

                                        echo '<tr>';
                                        if ($this->showExpectedChoice() || $this->showExpectedChoiceColumn()) {
                                            echo '<td>'.$s_answer_label.'</td>';
                                            echo '<td>'.$user_answer.'</td>';
                                            echo '<td>'.$real_list[$i_answer_correct_answer].'</td>';
                                            echo '<td>'.$status.'</td>';
                                        } else {
                                            echo '<td>'.$s_answer_label.'</td>';
                                            echo '<td>'.$user_answer.'</td>';
                                            echo '<td>'.$status.'</td>';
                                        }
                                        echo '</tr>';
                                        break;
                                }
                            }
                            $counterAnswer++;
                        }
                        $matchingCorrectAnswers[$questionId]['from_database']['count_options'] = count($options);
                        break 2; // break the switch and the "for" condition
                    } else {
                        if ($answerCorrect) {
                            if (isset($choice[$answerAutoId]) &&
                                $answerCorrect == $choice[$answerAutoId]
                            ) {
                                $matchingCorrectAnswers[$questionId]['form_values']['correct'][$answerAutoId] = $choice[$answerAutoId];
                                $correctAnswerId[] = $answerAutoId;
                                $questionScore += $answerWeighting;
                                $totalScore += $answerWeighting;
                                $user_answer = Display::span($answerMatching[$choice[$answerAutoId]]);
                            } else {
                                if (isset($answerMatching[$choice[$answerAutoId]])) {
                                    $user_answer = Display::span(
                                        $answerMatching[$choice[$answerAutoId]],
                                        ['style' => 'color: #FF0000; text-decoration: line-through;']
                                    );
                                }
                            }
                            $matching[$answerAutoId] = $choice[$answerAutoId];
                        }
                        $matchingCorrectAnswers[$questionId]['form_values']['count_options'] = count($choice);
                    }
                    break;
                case HOT_SPOT:
                case HOT_SPOT_COMBINATION:
                    if ($from_database) {
                        $TBL_TRACK_HOTSPOT = Database::get_main_table(TABLE_STATISTIC_TRACK_E_HOTSPOT);
                        // Check auto id
                        $foundAnswerId = $answerAutoId;
                        $sql = "SELECT hotspot_correct
                                FROM $TBL_TRACK_HOTSPOT
                                WHERE
                                    hotspot_exe_id = $exeId AND
                                    hotspot_question_id= $questionId AND
                                    hotspot_answer_id = $answerAutoId
                                ORDER BY hotspot_id ASC";
                        $result = Database::query($sql);
                        if (Database::num_rows($result)) {
                            $studentChoice = Database::result(
                                $result,
                                0,
                                'hotspot_correct'
                            );

                            if ($studentChoice) {
                                $questionScore += $answerWeighting;
                                $totalScore += $answerWeighting;
                            }
                        } else {
                            // If answer.id is different:
                            $sql = "SELECT hotspot_correct
                                FROM $TBL_TRACK_HOTSPOT
                                WHERE
                                    hotspot_exe_id = $exeId AND
                                    hotspot_question_id= $questionId AND
                                    hotspot_answer_id = ".intval($answerId)."
                                ORDER BY hotspot_id ASC";
                            $result = Database::query($sql);
                            $foundAnswerId = $answerId;
                            if (Database::num_rows($result)) {
                                $studentChoice = Database::result(
                                    $result,
                                    0,
                                    'hotspot_correct'
                                );

                                if ($studentChoice) {
                                    $questionScore += $answerWeighting;
                                    $totalScore += $answerWeighting;
                                }
                            } else {
                                // check answer.iid
                                if (!empty($answerIid)) {
                                    $sql = "SELECT hotspot_correct
                                            FROM $TBL_TRACK_HOTSPOT
                                            WHERE
                                                hotspot_exe_id = $exeId AND
                                                hotspot_question_id= $questionId AND
                                                hotspot_answer_id = $answerIid
                                            ORDER BY hotspot_id ASC";
                                    $result = Database::query($sql);
                                    $foundAnswerId = $answerIid;
                                    $studentChoice = Database::result(
                                        $result,
                                        0,
                                        'hotspot_correct'
                                    );

                                    if ($studentChoice) {
                                        $questionScore += $answerWeighting;
                                        $totalScore += $answerWeighting;
                                    }
                                }
                            }
                        }
                    } else {
                        if (!isset($choice[$answerAutoId]) && !isset($choice[$answerIid])) {
                            $choice[$answerAutoId] = 0;
                            $choice[$answerIid] = 0;
                        } else {
                            $studentChoice = $choice[$answerAutoId];
                            if (empty($studentChoice)) {
                                $studentChoice = $choice[$answerIid];
                            }
                            $choiceIsValid = false;
                            if (!empty($studentChoice)) {
                                $hotspotType = $objAnswerTmp->selectHotspotType($answerId);
                                $hotspotCoordinates = $objAnswerTmp->selectHotspotCoordinates($answerId);
                                $choicePoint = Geometry::decodePoint($studentChoice);

                                switch ($hotspotType) {
                                    case 'square':
                                        $hotspotProperties = Geometry::decodeSquare($hotspotCoordinates);
                                        $choiceIsValid = Geometry::pointIsInSquare($hotspotProperties, $choicePoint);
                                        break;
                                    case 'circle':
                                        $hotspotProperties = Geometry::decodeEllipse($hotspotCoordinates);
                                        $choiceIsValid = Geometry::pointIsInEllipse($hotspotProperties, $choicePoint);
                                        break;
                                    case 'poly':
                                        $hotspotProperties = Geometry::decodePolygon($hotspotCoordinates);
                                        $choiceIsValid = Geometry::pointIsInPolygon($hotspotProperties, $choicePoint);
                                        break;
                                }
                            }

                            $choice[$answerAutoId] = 0;
                            if ($choiceIsValid) {
                                $questionScore += $answerWeighting;
                                $totalScore += $answerWeighting;
                                $choice[$answerAutoId] = 1;
                                $choice[$answerIid] = 1;
                            }
                        }
                    }
                    break;
                case HOT_SPOT_ORDER:
                    // @todo never added to chamilo
                    // for hotspot with fixed order
                    $studentChoice = $choice['order'][$answerId];
                    if ($studentChoice == $answerId) {
                        $questionScore += $answerWeighting;
                        $totalScore += $answerWeighting;
                        $studentChoice = true;
                    } else {
                        $studentChoice = false;
                    }
                    break;
                case HOT_SPOT_DELINEATION:
                    // for hotspot with delineation
                    if ($from_database) {
                        // getting the user answer
                        $TBL_TRACK_HOTSPOT = Database::get_main_table(TABLE_STATISTIC_TRACK_E_HOTSPOT);
                        $query = "SELECT hotspot_correct, hotspot_coordinate
                                    FROM $TBL_TRACK_HOTSPOT
                                    WHERE
                                        hotspot_exe_id = $exeId AND
                                        hotspot_question_id= $questionId AND
                                        hotspot_answer_id = '1'";
                        // By default we take 1 because it's a delineation
                        $resq = Database::query($query);
                        $row = Database::fetch_array($resq, 'ASSOC');

                        $choice = $row['hotspot_correct'];
                        $user_answer = $row['hotspot_coordinate'];

                        // THIS is very important otherwise the poly_compile will throw an error!!
                        // round-up the coordinates
                        $coords = explode('/', $user_answer);
                        $coords = array_filter($coords);
                        $user_array = '';
                        foreach ($coords as $coord) {
                            [$x, $y] = explode(';', $coord);
                            $user_array .= round($x).';'.round($y).'/';
                        }
                        $user_array = substr($user_array, 0, -1) ?: '';
                    } else {
                        if (!empty($studentChoice)) {
                            $correctAnswerId[] = $answerAutoId;
                            $newquestionList[] = $questionId;
                        }

                        if (1 === $answerId) {
                            $studentChoice = $choice[$answerId];
                            $questionScore += $answerWeighting;
                        }
                        if (isset($_SESSION['exerciseResultCoordinates'][$questionId])) {
                            $user_array = $_SESSION['exerciseResultCoordinates'][$questionId];
                        }
                    }
                    $_SESSION['hotspot_coord'][$questionId][1] = $delineation_cord;
                    $_SESSION['hotspot_dest'][$questionId][1] = $answer_delineation_destination;
                    break;
                case ANNOTATION:
                    if ($from_database) {
                        $sql = "SELECT answer, marks
                                FROM $TBL_TRACK_ATTEMPT
                                WHERE
                                  exe_id = $exeId AND
                                  question_id = $questionId ";
                        $resq = Database::query($sql);
                        $data = Database::fetch_array($resq);

                        $questionScore = empty($data['marks']) ? 0 : $data['marks'];
                        $arrques = $questionName;
                        break;
                    }
                    $studentChoice = $choice;
                    if ($studentChoice) {
                        $questionScore = 0;
                    }
                    break;
            }

            if ($show_result) {
                if ('exercise_result' === $from) {
                    // Display answers (if not matching type, or if the answer is correct)
                    if (!in_array($answerType, [MATCHING, MATCHING_COMBINATION, DRAGGABLE, MATCHING_DRAGGABLE, MATCHING_DRAGGABLE_COMBINATION]) ||
                        $answerCorrect
                    ) {
                        if (in_array(
                            $answerType,
                            [
                                UNIQUE_ANSWER,
                                UNIQUE_ANSWER_IMAGE,
                                UNIQUE_ANSWER_NO_OPTION,
                                MULTIPLE_ANSWER,
                                MULTIPLE_ANSWER_COMBINATION,
                                GLOBAL_MULTIPLE_ANSWER,
                                READING_COMPREHENSION,
                            ]
                        )) {
                            ExerciseShowFunctions::display_unique_or_multiple_answer(
                                $this,
                                $feedback_type,
                                $answerType,
                                $studentChoice,
                                $answer,
                                $answerComment,
                                $answerCorrect,
                                0,
                                0,
                                0,
                                $results_disabled,
                                $showTotalScoreAndUserChoicesInLastAttempt,
                                $this->export
                            );
                        } elseif ($answerType == MULTIPLE_ANSWER_TRUE_FALSE) {
                            ExerciseShowFunctions::display_multiple_answer_true_false(
                                $this,
                                $feedback_type,
                                $answerType,
                                $studentChoice,
                                $answer,
                                $answerComment,
                                $answerCorrect,
                                0,
                                $questionId,
                                0,
                                $results_disabled,
                                $showTotalScoreAndUserChoicesInLastAttempt
                            );
                        } elseif ($answerType == MULTIPLE_ANSWER_TRUE_FALSE_DEGREE_CERTAINTY) {
                            ExerciseShowFunctions::displayMultipleAnswerTrueFalseDegreeCertainty(
                                $this,
                                $feedback_type,
                                $studentChoice,
                                $studentChoiceDegree,
                                $answer,
                                $answerComment,
                                $answerCorrect,
                                $questionId,
                                $results_disabled
                            );
                        } elseif ($answerType == MULTIPLE_ANSWER_COMBINATION_TRUE_FALSE) {
                            ExerciseShowFunctions::display_multiple_answer_combination_true_false(
                                $this,
                                $feedback_type,
                                $answerType,
                                $studentChoice,
                                $answer,
                                $answerComment,
                                $answerCorrect,
                                0,
                                0,
                                0,
                                $results_disabled,
                                $showTotalScoreAndUserChoicesInLastAttempt
                            );
                        } elseif (in_array($answerType, [FILL_IN_BLANKS, FILL_IN_BLANKS_COMBINATION])) {
                            ExerciseShowFunctions::display_fill_in_blanks_answer(
                                $this,
                                $feedback_type,
                                $answer,
                                0,
                                0,
                                $results_disabled,
                                '',
                                $showTotalScoreAndUserChoicesInLastAttempt
                            );
                        } elseif ($answerType == CALCULATED_ANSWER) {
                            ExerciseShowFunctions::display_calculated_answer(
                                $this,
                                $feedback_type,
                                $answer,
                                0,
                                0,
                                $results_disabled,
                                $showTotalScoreAndUserChoicesInLastAttempt,
                                $expectedAnswer,
                                $calculatedChoice,
                                $calculatedStatus
                            );
                        } elseif ($answerType == FREE_ANSWER) {
                            ExerciseShowFunctions::display_free_answer(
                                $feedback_type,
                                $choice,
                                $exeId,
                                $questionId,
                                $questionScore,
                                $results_disabled
                            );
                        } elseif ($answerType == UPLOAD_ANSWER) {
                            ExerciseShowFunctions::displayUploadAnswer(
                                $feedback_type,
                                $choice,
                                $exeId,
                                $questionId,
                                $questionScore,
                                $results_disabled
                            );
                        } elseif ($answerType == ANSWER_IN_OFFICE_DOC) {
                            $exe_info = Event::get_exercise_results_by_attempt($exeId);
                            $exe_info = $exe_info[$exeId] ?? null;
                            ExerciseShowFunctions::displayOnlyOfficeAnswer(
                                $feedback_type,
                                $exeId,
                                $exe_info['exe_user_id'] ?? api_get_user_id(),
                                $this->iid,
                                $questionId,
                                $questionScore,
                                true
                            );
                        } elseif ($answerType == ORAL_EXPRESSION) {
                            // to store the details of open questions in an array to be used in mail
                            /** @var OralExpression $objQuestionTmp */
                            ExerciseShowFunctions::display_oral_expression_answer(
                                $feedback_type,
                                $choice,
                                0,
                                0,
                                $objQuestionTmp->getFileUrl(true),
                                $results_disabled,
                                $questionScore
                            );
                        } elseif (in_array($answerType, [HOT_SPOT, HOT_SPOT_COMBINATION])) {
                            $correctAnswerId = 0;
                            /** @var TrackEHotspot $hotspot */
                            foreach ($orderedHotSpots as $correctAnswerId => $hotspot) {
                                if ($hotspot->getHotspotAnswerId() == $answerIid) {
                                    break;
                                }
                            }

                            // force to show whether the choice is correct or not
                            $showTotalScoreAndUserChoicesInLastAttempt = true;
                            ExerciseShowFunctions::display_hotspot_answer(
                                $this,
                                $feedback_type,
                                $answerId,
                                $answer,
                                $studentChoice,
                                $answerComment,
                                $results_disabled,
                                $answerId,
                                $showTotalScoreAndUserChoicesInLastAttempt
                            );
                        } elseif ($answerType == HOT_SPOT_ORDER) {
                            ExerciseShowFunctions::display_hotspot_order_answer(
                                $feedback_type,
                                $answerId,
                                $answer,
                                $studentChoice,
                                $answerComment
                            );
                        } elseif ($answerType == HOT_SPOT_DELINEATION) {
                            $user_answer = $_SESSION['exerciseResultCoordinates'][$questionId];

                            // Round-up the coordinates
                            $coords = explode('/', $user_answer);
                            $coords = array_filter($coords);
                            $user_array = '';
                            foreach ($coords as $coord) {
                                if (!empty($coord)) {
                                    $parts = explode(';', $coord);
                                    if (!empty($parts)) {
                                        $user_array .= round($parts[0]).';'.round($parts[1]).'/';
                                    }
                                }
                            }
                            $user_array = substr($user_array, 0, -1) ?: '';
                            if ($next) {
                                $user_answer = $user_array;
                                // We compare only the delineation not the other points
                                $answer_question = $_SESSION['hotspot_coord'][$questionId][1];
                                $answerDestination = $_SESSION['hotspot_dest'][$questionId][1];

                                // Calculating the area
                                $poly_user = convert_coordinates($user_answer, '/');
                                $poly_answer = convert_coordinates($answer_question, '|');
                                $max_coord = poly_get_max($poly_user, $poly_answer);
                                $poly_user_compiled = poly_compile($poly_user, $max_coord);
                                $poly_answer_compiled = poly_compile($poly_answer, $max_coord);
                                $poly_results = poly_result($poly_answer_compiled, $poly_user_compiled, $max_coord);

                                $overlap = $poly_results['both'];
                                $poly_answer_area = $poly_results['s1'];
                                $poly_user_area = $poly_results['s2'];
                                $missing = $poly_results['s1Only'];
                                $excess = $poly_results['s2Only'];

                                // //this is an area in pixels
                                if ($debug > 0) {
                                    error_log(__LINE__.' - Polygons results are '.print_r($poly_results, 1), 0);
                                }

                                if ($overlap < 1) {
                                    // Shortcut to avoid complicated calculations
                                    $final_overlap = 0;
                                    $final_missing = 100;
                                    $final_excess = 100;
                                } else {
                                    // the final overlap is the percentage of the initial polygon
                                    // that is overlapped by the user's polygon
                                    $final_overlap = round(((float) $overlap / (float) $poly_answer_area) * 100);
                                    if ($debug > 1) {
                                        error_log(__LINE__.' - Final overlap is '.$final_overlap, 0);
                                    }
                                    // the final missing area is the percentage of the initial polygon
                                    // that is not overlapped by the user's polygon
                                    $final_missing = 100 - $final_overlap;
                                    if ($debug > 1) {
                                        error_log(__LINE__.' - Final missing is '.$final_missing, 0);
                                    }
                                    // the final excess area is the percentage of the initial polygon's size
                                    // that is covered by the user's polygon outside of the initial polygon
                                    $final_excess = round((((float) $poly_user_area - (float) $overlap) / (float) $poly_answer_area) * 100);
                                    if ($debug > 1) {
                                        error_log(__LINE__.' - Final excess is '.$final_excess, 0);
                                    }
                                }

                                // Checking the destination parameters parsing the "@@"
                                $destination_items = explode('@@', $answerDestination);
                                $threadhold_total = $destination_items[0];
                                $threadhold_items = explode(';', $threadhold_total);
                                $threadhold1 = $threadhold_items[0]; // overlap
                                $threadhold2 = $threadhold_items[1]; // excess
                                $threadhold3 = $threadhold_items[2]; // missing

                                // if is delineation
                                if ($answerId === 1) {
                                    //setting colors
                                    if ($final_overlap >= $threadhold1) {
                                        $overlap_color = true;
                                    }
                                    if ($final_excess <= $threadhold2) {
                                        $excess_color = true;
                                    }
                                    if ($final_missing <= $threadhold3) {
                                        $missing_color = true;
                                    }

                                    // if pass
                                    if ($final_overlap >= $threadhold1 &&
                                        $final_missing <= $threadhold3 &&
                                        $final_excess <= $threadhold2
                                    ) {
                                        $next = 1; //go to the oars
                                        $result_comment = get_lang('Acceptable');
                                        $final_answer = 1; // do not update with  update_exercise_attempt
                                    } else {
                                        $next = 0;
                                        $result_comment = get_lang('Unacceptable');
                                        $comment = $answerDestination = $objAnswerTmp->selectComment(1);
                                        $answerDestination = $objAnswerTmp->selectDestination(1);
                                        // checking the destination parameters parsing the "@@"
                                        $destination_items = explode('@@', $answerDestination);
                                    }
                                } elseif ($answerId > 1) {
                                    if ($objAnswerTmp->selectHotspotType($answerId) == 'noerror') {
                                        if ($debug > 0) {
                                            error_log(__LINE__.' - answerId is of type noerror', 0);
                                        }
                                        //type no error shouldn't be treated
                                        $next = 1;
                                        continue;
                                    }
                                    if ($debug > 0) {
                                        error_log(__LINE__.' - answerId is >1 so we\'re probably in OAR', 0);
                                    }
                                    $delineation_cord = $objAnswerTmp->selectHotspotCoordinates($answerId);
                                    $poly_answer = convert_coordinates($delineation_cord, '|');
                                    $max_coord = poly_get_max($poly_user, $poly_answer);
                                    $poly_answer_compiled = poly_compile($poly_answer, $max_coord);
                                    $overlap = poly_touch($poly_user_compiled, $poly_answer_compiled, $max_coord);

                                    if ($overlap == false) {
                                        //all good, no overlap
                                        $next = 1;
                                        continue;
                                    } else {
                                        if ($debug > 0) {
                                            error_log(__LINE__.' - Overlap is '.$overlap.': OAR hit', 0);
                                        }
                                        $organs_at_risk_hit++;
                                        //show the feedback
                                        $next = 0;
                                        $comment = $answerDestination = $objAnswerTmp->selectComment($answerId);
                                        $answerDestination = $objAnswerTmp->selectDestination($answerId);

                                        $destination_items = explode('@@', $answerDestination);
                                        $try_hotspot = $destination_items[1];
                                        $lp_hotspot = $destination_items[2];
                                        $select_question_hotspot = $destination_items[3];
                                        $url_hotspot = $destination_items[4];
                                    }
                                }
                            } else {
                                // the first delineation feedback
                                if ($debug > 0) {
                                    error_log(__LINE__.' first', 0);
                                }
                            }
                        } elseif (in_array($answerType, [MATCHING, MATCHING_COMBINATION, MATCHING_DRAGGABLE, MATCHING_DRAGGABLE_COMBINATION])) {
                            echo '<tr>';
                            echo Display::tag('td', $answerMatching[$answerId]);
                            echo Display::tag(
                                'td',
                                "$user_answer / ".Display::tag(
                                    'strong',
                                    $answerMatching[$answerCorrect],
                                    ['style' => 'color: #008000; font-weight: bold;']
                                )
                            );
                            echo '</tr>';
                        } elseif ($answerType == ANNOTATION) {
                            ExerciseShowFunctions::displayAnnotationAnswer(
                                $feedback_type,
                                $exeId,
                                $questionId,
                                $questionScore,
                                $results_disabled
                            );
                        }
                    }
                } else {
                    if ($debug) {
                        error_log('Showing questions $from '.$from);
                    }

                    switch ($answerType) {
                        case UNIQUE_ANSWER:
                        case UNIQUE_ANSWER_IMAGE:
                        case UNIQUE_ANSWER_NO_OPTION:
                        case MULTIPLE_ANSWER:
                        case GLOBAL_MULTIPLE_ANSWER:
                        case MULTIPLE_ANSWER_COMBINATION:
                        case READING_COMPREHENSION:
                            if ($answerId == 1) {
                                ExerciseShowFunctions::display_unique_or_multiple_answer(
                                    $this,
                                    $feedback_type,
                                    $answerType,
                                    $studentChoice,
                                    $answer,
                                    $answerComment,
                                    $answerCorrect,
                                    $exeId,
                                    $questionId,
                                    $answerId,
                                    $results_disabled,
                                    $showTotalScoreAndUserChoicesInLastAttempt,
                                    $this->export
                                );
                            } else {
                                ExerciseShowFunctions::display_unique_or_multiple_answer(
                                    $this,
                                    $feedback_type,
                                    $answerType,
                                    $studentChoice,
                                    $answer,
                                    $answerComment,
                                    $answerCorrect,
                                    $exeId,
                                    $questionId,
                                    '',
                                    $results_disabled,
                                    $showTotalScoreAndUserChoicesInLastAttempt,
                                    $this->export
                                );
                            }
                            break;
                        case MULTIPLE_ANSWER_COMBINATION_TRUE_FALSE:
                            if ($answerId == 1) {
                                ExerciseShowFunctions::display_multiple_answer_combination_true_false(
                                    $this,
                                    $feedback_type,
                                    $answerType,
                                    $studentChoice,
                                    $answer,
                                    $answerComment,
                                    $answerCorrect,
                                    $exeId,
                                    $questionId,
                                    $answerId,
                                    $results_disabled,
                                    $showTotalScoreAndUserChoicesInLastAttempt
                                );
                            } else {
                                ExerciseShowFunctions::display_multiple_answer_combination_true_false(
                                    $this,
                                    $feedback_type,
                                    $answerType,
                                    $studentChoice,
                                    $answer,
                                    $answerComment,
                                    $answerCorrect,
                                    $exeId,
                                    $questionId,
                                    '',
                                    $results_disabled,
                                    $showTotalScoreAndUserChoicesInLastAttempt
                                );
                            }
                            break;
                        case MULTIPLE_ANSWER_TRUE_FALSE:
                            if ($answerId == 1) {
                                ExerciseShowFunctions::display_multiple_answer_true_false(
                                    $this,
                                    $feedback_type,
                                    $answerType,
                                    $studentChoice,
                                    $answer,
                                    $answerComment,
                                    $answerCorrect,
                                    $exeId,
                                    $questionId,
                                    $answerId,
                                    $results_disabled,
                                    $showTotalScoreAndUserChoicesInLastAttempt
                                );
                            } else {
                                ExerciseShowFunctions::display_multiple_answer_true_false(
                                    $this,
                                    $feedback_type,
                                    $answerType,
                                    $studentChoice,
                                    $answer,
                                    $answerComment,
                                    $answerCorrect,
                                    $exeId,
                                    $questionId,
                                    '',
                                    $results_disabled,
                                    $showTotalScoreAndUserChoicesInLastAttempt
                                );
                            }
                            break;
                        case MULTIPLE_ANSWER_TRUE_FALSE_DEGREE_CERTAINTY:
                            if ($answerId == 1) {
                                ExerciseShowFunctions::displayMultipleAnswerTrueFalseDegreeCertainty(
                                    $this,
                                    $feedback_type,
                                    $studentChoice,
                                    $studentChoiceDegree,
                                    $answer,
                                    $answerComment,
                                    $answerCorrect,
                                    $questionId,
                                    $results_disabled
                                );
                            } else {
                                ExerciseShowFunctions::displayMultipleAnswerTrueFalseDegreeCertainty(
                                    $this,
                                    $feedback_type,
                                    $studentChoice,
                                    $studentChoiceDegree,
                                    $answer,
                                    $answerComment,
                                    $answerCorrect,
                                    $questionId,
                                    $results_disabled
                                );
                            }
                            break;
                        case FILL_IN_BLANKS:
                        case FILL_IN_BLANKS_COMBINATION:
                            ExerciseShowFunctions::display_fill_in_blanks_answer(
                                $this,
                                $feedback_type,
                                $answer,
                                $exeId,
                                $questionId,
                                $results_disabled,
                                $str,
                                $showTotalScoreAndUserChoicesInLastAttempt
                            );
                            break;
                        case CALCULATED_ANSWER:
                            ExerciseShowFunctions::display_calculated_answer(
                                $this,
                                $feedback_type,
                                $answer,
                                $exeId,
                                $questionId,
                                $results_disabled,
                                '',
                                $showTotalScoreAndUserChoicesInLastAttempt
                            );
                            break;
                        case FREE_ANSWER:
                            echo ExerciseShowFunctions::display_free_answer(
                                $feedback_type,
                                $choice,
                                $exeId,
                                $questionId,
                                $questionScore,
                                $results_disabled
                            );
                            break;
                        case UPLOAD_ANSWER:
                            echo ExerciseShowFunctions::displayUploadAnswer(
                                $feedback_type,
                                $choice,
                                $exeId,
                                $questionId,
                                $questionScore,
                                $results_disabled
                            );
                            break;
                        case ANSWER_IN_OFFICE_DOC:
                            $exe_info = Event::get_exercise_results_by_attempt($exeId);
                            $exe_info = $exe_info[$exeId] ?? null;
                            ExerciseShowFunctions::displayOnlyOfficeAnswer(
                                $feedback_type,
                                $exeId,
                                $exe_info['exe_user_id'] ?? api_get_user_id(),
                                $this->iid,
                                $questionId,
                                $questionScore
                            );
                            break;
                        case ORAL_EXPRESSION:
                            echo '<tr>
                                <td>'.
                                ExerciseShowFunctions::display_oral_expression_answer(
                                    $feedback_type,
                                    $choice,
                                    $exeId,
                                    $questionId,
                                    $objQuestionTmp->getFileUrl(),
                                    $results_disabled,
                                    $questionScore
                                ).'</td>
                                </tr>
                                </table>';
                            break;
                        case HOT_SPOT:
                        case HOT_SPOT_COMBINATION:
                            $correctAnswerId = 0;
                            /** @var TrackEHotspot $hotspot */
                            foreach ($orderedHotSpots as $correctAnswerId => $hotspot) {
                                if ($hotspot->getHotspotAnswerId() == $foundAnswerId) {
                                    break;
                                }
                            }

                            ExerciseShowFunctions::display_hotspot_answer(
                                $this,
                                $feedback_type,
                                $answerId,
                                $answer,
                                $studentChoice,
                                $answerComment,
                                $results_disabled,
                                $answerId,
                                $showTotalScoreAndUserChoicesInLastAttempt
                            );
                            break;
                        case HOT_SPOT_DELINEATION:
                            $user_answer = $user_array;
                            if ($next) {
                                $user_answer = $user_array;
                                // we compare only the delineation not the other points
                                $answer_question = $_SESSION['hotspot_coord'][$questionId][1];
                                $answerDestination = $_SESSION['hotspot_dest'][$questionId][1];

                                // calculating the area
                                $poly_user = convert_coordinates($user_answer, '/');
                                $poly_answer = convert_coordinates($answer_question, '|');
                                $max_coord = poly_get_max($poly_user, $poly_answer);
                                $poly_user_compiled = poly_compile($poly_user, $max_coord);
                                $poly_answer_compiled = poly_compile($poly_answer, $max_coord);
                                $poly_results = poly_result($poly_answer_compiled, $poly_user_compiled, $max_coord);

                                $overlap = $poly_results['both'];
                                $poly_answer_area = $poly_results['s1'];
                                $poly_user_area = $poly_results['s2'];
                                $missing = $poly_results['s1Only'];
                                $excess = $poly_results['s2Only'];
                                if ($debug > 0) {
                                    error_log(__LINE__.' - Polygons results are '.print_r($poly_results, 1), 0);
                                }
                                if ($overlap < 1) {
                                    //shortcut to avoid complicated calculations
                                    $final_overlap = 0;
                                    $final_missing = 100;
                                    $final_excess = 100;
                                } else {
                                    // the final overlap is the percentage of the initial polygon
                                    // that is overlapped by the user's polygon
                                    $final_overlap = round(((float) $overlap / (float) $poly_answer_area) * 100);

                                    // the final missing area is the percentage of the initial polygon that
                                    // is not overlapped by the user's polygon
                                    $final_missing = 100 - $final_overlap;
                                    // the final excess area is the percentage of the initial polygon's size that is
                                    // covered by the user's polygon outside of the initial polygon
                                    $final_excess = round((((float) $poly_user_area - (float) $overlap) / (float) $poly_answer_area) * 100);

                                    if ($debug > 1) {
                                        error_log(__LINE__.' - Final overlap is '.$final_overlap);
                                        error_log(__LINE__.' - Final excess is '.$final_excess);
                                        error_log(__LINE__.' - Final missing is '.$final_missing);
                                    }
                                }

                                // Checking the destination parameters parsing the "@@"
                                $destination_items = explode('@@', $answerDestination);
                                $threadhold_total = $destination_items[0];
                                $threadhold_items = explode(';', $threadhold_total);
                                $threadhold1 = $threadhold_items[0]; // overlap
                                $threadhold2 = $threadhold_items[1]; // excess
                                $threadhold3 = $threadhold_items[2]; //missing
                                // if is delineation
                                if ($answerId === 1) {
                                    //setting colors
                                    if ($final_overlap >= $threadhold1) {
                                        $overlap_color = true;
                                    }
                                    if ($final_excess <= $threadhold2) {
                                        $excess_color = true;
                                    }
                                    if ($final_missing <= $threadhold3) {
                                        $missing_color = true;
                                    }

                                    // if pass
                                    if ($final_overlap >= $threadhold1 &&
                                        $final_missing <= $threadhold3 &&
                                        $final_excess <= $threadhold2
                                    ) {
                                        $next = 1; //go to the oars
                                        $result_comment = get_lang('Acceptable');
                                        $final_answer = 1; // do not update with  update_exercise_attempt
                                    } else {
                                        $next = 0;
                                        $result_comment = get_lang('Unacceptable');
                                        $comment = $answerDestination = $objAnswerTmp->selectComment(1);
                                        $answerDestination = $objAnswerTmp->selectDestination(1);
                                        //checking the destination parameters parsing the "@@"
                                        $destination_items = explode('@@', $answerDestination);
                                    }
                                } elseif ($answerId > 1) {
                                    if ($objAnswerTmp->selectHotspotType($answerId) === 'noerror') {
                                        if ($debug > 0) {
                                            error_log(__LINE__.' - answerId is of type noerror', 0);
                                        }
                                        //type no error shouldn't be treated
                                        $next = 1;
                                        break;
                                    }
                                    if ($debug > 0) {
                                        error_log(__LINE__.' - answerId is >1 so we\'re probably in OAR', 0);
                                    }
                                    $delineation_cord = $objAnswerTmp->selectHotspotCoordinates($answerId);
                                    $poly_answer = convert_coordinates($delineation_cord, '|');
                                    $max_coord = poly_get_max($poly_user, $poly_answer);
                                    $poly_answer_compiled = poly_compile($poly_answer, $max_coord);
                                    $overlap = poly_touch($poly_user_compiled, $poly_answer_compiled, $max_coord);

                                    if ($overlap == false) {
                                        //all good, no overlap
                                        $next = 1;
                                        break;
                                    } else {
                                        if ($debug > 0) {
                                            error_log(__LINE__.' - Overlap is '.$overlap.': OAR hit', 0);
                                        }
                                        $organs_at_risk_hit++;
                                        //show the feedback
                                        $next = 0;
                                        $comment = $answerDestination = $objAnswerTmp->selectComment($answerId);
                                        $answerDestination = $objAnswerTmp->selectDestination($answerId);

                                        $destination_items = explode('@@', $answerDestination);
                                        $try_hotspot = $destination_items[1];
                                        $lp_hotspot = $destination_items[2];
                                        $select_question_hotspot = $destination_items[3];
                                        $url_hotspot = $destination_items[4];
                                    }
                                }
                            }
                            break;
                        case HOT_SPOT_ORDER:
                            ExerciseShowFunctions::display_hotspot_order_answer(
                                $feedback_type,
                                $answerId,
                                $answer,
                                $studentChoice,
                                $answerComment
                            );
                            break;
                        case DRAGGABLE:
                        case MATCHING_DRAGGABLE:
                        case MATCHING_DRAGGABLE_COMBINATION:
                        case MATCHING_COMBINATION:
                        case MATCHING:
                            echo '<tr>';
                            echo Display::tag('td', $answerMatching[$answerId]);
                            echo Display::tag(
                                'td',
                                "$user_answer / ".Display::tag(
                                    'strong',
                                    $answerMatching[$answerCorrect],
                                    ['style' => 'color: #008000; font-weight: bold;']
                                )
                            );
                            echo '</tr>';
                            break;
                        case ANNOTATION:
                            ExerciseShowFunctions::displayAnnotationAnswer(
                                $feedback_type,
                                $exeId,
                                $questionId,
                                $questionScore,
                                $results_disabled
                            );
                            break;
                    }
                }
            }
        } // end for that loops over all answers of the current question

        // It validates unique score when all answers are correct for global questions
        if (FILL_IN_BLANKS_COMBINATION === $answerType) {
            $questionScore = ExerciseLib::getUserQuestionScoreGlobal(
                $answerType,
                $listCorrectAnswers,
                $exeId,
                $questionId,
                $questionWeighting
            );
        }
        if (HOT_SPOT_COMBINATION === $answerType) {
            $listCorrectAnswers = isset($exerciseResultCoordinates[$questionId]) ? $exerciseResultCoordinates[$questionId] : [];
            $questionScore = ExerciseLib::getUserQuestionScoreGlobal(
                $answerType,
                $listCorrectAnswers,
                $exeId,
                $questionId,
                $questionWeighting,
                $choice,
                $nbrAnswers
            );
        }
        if (in_array($answerType, [MATCHING_COMBINATION, MATCHING_DRAGGABLE_COMBINATION])) {
            $questionScore = ExerciseLib::getUserQuestionScoreGlobal(
                $answerType,
                $matchingCorrectAnswers[$questionId],
                $exeId,
                $questionId,
                $questionWeighting
            );
        }

        if ($debug) {
            error_log('-- End answer loop --');
        }

        $final_answer = true;

        foreach ($real_answers as $my_answer) {
            if (!$my_answer) {
                $final_answer = false;
            }
        }

        // We add the total score after dealing with the answers.
        if ($answerType == MULTIPLE_ANSWER_COMBINATION ||
            $answerType == MULTIPLE_ANSWER_COMBINATION_TRUE_FALSE
        ) {
            if ($final_answer) {
                //getting only the first score where we save the weight of all the question
                $answerWeighting = $objAnswerTmp->selectWeighting(1);
                if (empty($answerWeighting) && !empty($firstAnswer) && isset($firstAnswer['ponderation'])) {
                    $answerWeighting = $firstAnswer['ponderation'];
                }
                $questionScore += $answerWeighting;
            }
        }

        $extra_data = [
            'final_overlap' => $final_overlap,
            'final_missing' => $final_missing,
            'final_excess' => $final_excess,
            'overlap_color' => $overlap_color,
            'missing_color' => $missing_color,
            'excess_color' => $excess_color,
            'threadhold1' => $threadhold1,
            'threadhold2' => $threadhold2,
            'threadhold3' => $threadhold3,
        ];

        if ($from === 'exercise_result') {
            // if answer is hotspot. To the difference of exercise_show.php,
            //  we use the results from the session (from_db=0)
            // TODO Change this, because it is wrong to show the user
            //  some results that haven't been stored in the database yet
            if (in_array($answerType, [HOT_SPOT, HOT_SPOT_ORDER, HOT_SPOT_DELINEATION, HOT_SPOT_COMBINATION])) {
                if ($debug) {
                    error_log('$from AND this is a hotspot kind of question ');
                }
                if ($answerType === HOT_SPOT_DELINEATION) {
                    if ($showHotSpotDelineationTable) {
                        if (!is_numeric($final_overlap)) {
                            $final_overlap = 0;
                        }
                        if (!is_numeric($final_missing)) {
                            $final_missing = 0;
                        }
                        if (!is_numeric($final_excess)) {
                            $final_excess = 0;
                        }

                        if ($final_overlap > 100) {
                            $final_overlap = 100;
                        }

                        $table_resume = '<table class="table table-hover table-striped data_table">
                                <tr class="row_odd" >
                                    <td></td>
                                    <td ><b>'.get_lang('Requirements').'</b></td>
                                    <td><b>'.get_lang('YourAnswer').'</b></td>
                                </tr>
                                <tr class="row_even">
                                    <td><b>'.get_lang('Overlap').'</b></td>
                                    <td>'.get_lang('Min').' '.$threadhold1.'</td>
                                    <td class="text-right '.($overlap_color ? 'text-success' : 'text-danger').'">'
                            .(($final_overlap < 0) ? 0 : intval($final_overlap)).'</td>
                                </tr>
                                <tr>
                                    <td><b>'.get_lang('Excess').'</b></td>
                                    <td>'.get_lang('Max').' '.$threadhold2.'</td>
                                    <td class="text-right '.($excess_color ? 'text-success' : 'text-danger').'">'
                            .(($final_excess < 0) ? 0 : intval($final_excess)).'</td>
                                </tr>
                                <tr class="row_even">
                                    <td><b>'.get_lang('Missing').'</b></td>
                                    <td>'.get_lang('Max').' '.$threadhold3.'</td>
                                    <td class="text-right '.($missing_color ? 'text-success' : 'text-danger').'">'
                            .(($final_missing < 0) ? 0 : intval($final_missing)).'</td>
                                </tr>
                            </table>';
                        if ($next == 0) {
                        } else {
                            $comment = $answerComment = $objAnswerTmp->selectComment($nbrAnswers);
                            $answerDestination = $objAnswerTmp->selectDestination($nbrAnswers);
                        }

                        $message = '<h1><div style="color:#333;">'.get_lang('Feedback').'</div></h1>
                                    <p style="text-align:center">';
                        $message .= '<p>'.get_lang('YourDelineation').'</p>';
                        $message .= $table_resume;
                        $message .= '<br />'.get_lang('ResultIs').' '.$result_comment.'<br />';
                        if ($organs_at_risk_hit > 0) {
                            $message .= '<p><b>'.get_lang('OARHit').'</b></p>';
                        }
                        $message .= '<p>'.$comment.'</p>';
                        echo $message;

                        $_SESSION['hotspot_delineation_result'][$this->selectId()][$questionId][0] = $message;
                        $_SESSION['hotspot_delineation_result'][$this->selectId()][$questionId][1] = $_SESSION['exerciseResultCoordinates'][$questionId];
                    } else {
                        echo $hotspot_delineation_result[0];
                    }

                    // Save the score attempts
                    if (1) {
                        //getting the answer 1 or 0 comes from exercise_submit_modal.php
                        $final_answer = isset($hotspot_delineation_result[1]) ? $hotspot_delineation_result[1] : '';
                        if ($final_answer == 0) {
                            $questionScore = 0;
                        }
                        // we always insert the answer_id 1 = delineation
                        Event::saveQuestionAttempt($questionScore, 1, $quesId, $exeId, 0);
                        //in delineation mode, get the answer from $hotspot_delineation_result[1]
                        $hotspotValue = isset($hotspot_delineation_result[1]) ? (int) $hotspot_delineation_result[1] === 1 ? 1 : 0 : 0;
                        Event::saveExerciseAttemptHotspot(
                            $exeId,
                            $quesId,
                            1,
                            $hotspotValue,
                            $exerciseResultCoordinates[$quesId],
                            false,
                            0,
                            $learnpath_id,
                            $learnpath_item_id
                        );
                    } else {
                        if ($final_answer == 0) {
                            $questionScore = 0;
                            $answer = 0;
                            Event::saveQuestionAttempt($questionScore, $answer, $quesId, $exeId, 0);
                            if (is_array($exerciseResultCoordinates[$quesId])) {
                                foreach ($exerciseResultCoordinates[$quesId] as $idx => $val) {
                                    Event::saveExerciseAttemptHotspot(
                                        $exeId,
                                        $quesId,
                                        $idx,
                                        0,
                                        $val,
                                        false,
                                        0,
                                        $learnpath_id,
                                        $learnpath_item_id
                                    );
                                }
                            }
                        } else {
                            Event::saveQuestionAttempt($questionScore, $answer, $quesId, $exeId, 0);
                            if (is_array($exerciseResultCoordinates[$quesId])) {
                                foreach ($exerciseResultCoordinates[$quesId] as $idx => $val) {
                                    $hotspotValue = (int) $choice[$idx] === 1 ? 1 : 0;
                                    Event::saveExerciseAttemptHotspot(
                                        $exeId,
                                        $quesId,
                                        $idx,
                                        $hotspotValue,
                                        $val,
                                        false,
                                        0,
                                        $learnpath_id,
                                        $learnpath_item_id
                                    );
                                }
                            }
                        }
                    }
                }
            }

            $relPath = api_get_path(WEB_CODE_PATH);

            if (in_array($answerType, [HOT_SPOT, HOT_SPOT_COMBINATION, HOT_SPOT_ORDER])) {
                // We made an extra table for the answers
                if ($show_result) {
                    echo '</table></td></tr>';
                    echo "
                        <tr>
                            <td>
                                <p><em>".get_lang('HotSpot')."</em></p>
                                <div id=\"hotspot-solution-$questionId\"></div>
                                <script>
                                    $(function() {
                                        new HotspotQuestion({
                                            questionId: $questionId,
                                            exerciseId: {$this->iid},
                                            exeId: $exeId,
                                            selector: '#hotspot-solution-$questionId',
                                            for: 'solution',
                                            relPath: '$relPath'
                                        });
                                    });
                                </script>
                            </td>
                        </tr>
                    ";
                }
            } elseif ($answerType == ANNOTATION) {
                if ($show_result) {
                    echo '
                        <p><em>'.get_lang('Annotation').'</em></p>
                        <div id="annotation-canvas-'.$questionId.'"></div>
                        <script>
                            AnnotationQuestion({
                                questionId: parseInt('.$questionId.'),
                                exerciseId: parseInt('.$exeId.'),
                                relPath: \''.$relPath.'\',
                                courseId: parseInt('.$course_id.')
                            });
                        </script>
                    ';
                }
            }

            if ($show_result && $answerType != ANNOTATION) {
                echo '</table>';
            }
        }
        unset($objAnswerTmp);

        $totalWeighting += $questionWeighting;
        // Store results directly in the database
        // For all in one page exercises, the results will be
        // stored by exercise_results.php (using the session)
        if ($save_results) {
            if ($debug) {
                error_log("Save question results $save_results");
                error_log("Question score: $questionScore");
                error_log('choice: ');
                error_log(print_r($choice, 1));
            }

            if (empty($choice)) {
                $choice = 0;
            }
            // with certainty degree
            if (empty($choiceDegreeCertainty)) {
                $choiceDegreeCertainty = 0;
            }
            if ($answerType == MULTIPLE_ANSWER_TRUE_FALSE ||
                $answerType == MULTIPLE_ANSWER_COMBINATION_TRUE_FALSE ||
                $answerType == MULTIPLE_ANSWER_TRUE_FALSE_DEGREE_CERTAINTY
            ) {
                if ($choice != 0) {
                    $reply = array_keys($choice);
                    $countReply = count($reply);
                    for ($i = 0; $i < $countReply; $i++) {
                        $chosenAnswer = $reply[$i];
                        if ($answerType == MULTIPLE_ANSWER_TRUE_FALSE_DEGREE_CERTAINTY) {
                            if ($choiceDegreeCertainty != 0) {
                                $replyDegreeCertainty = array_keys($choiceDegreeCertainty);
                                $answerDegreeCertainty = isset($replyDegreeCertainty[$i]) ? $replyDegreeCertainty[$i] : '';
                                $answerValue = isset($choiceDegreeCertainty[$answerDegreeCertainty]) ? $choiceDegreeCertainty[$answerDegreeCertainty] : '';
                                Event::saveQuestionAttempt(
                                    $questionScore,
                                    $chosenAnswer.':'.$choice[$chosenAnswer].':'.$answerValue,
                                    $quesId,
                                    $exeId,
                                    $i,
                                    $this->iid,
                                    $updateResults,
                                    $questionDuration
                                );
                            }
                        } else {
                            Event::saveQuestionAttempt(
                                $questionScore,
                                $chosenAnswer.':'.$choice[$chosenAnswer],
                                $quesId,
                                $exeId,
                                $i,
                                $this->iid,
                                $updateResults,
                                $questionDuration
                            );
                        }
                        if ($debug) {
                            error_log('result =>'.$questionScore.' '.$chosenAnswer.':'.$choice[$chosenAnswer]);
                        }
                    }
                } else {
                    Event::saveQuestionAttempt(
                        $questionScore,
                        0,
                        $quesId,
                        $exeId,
                        0,
                        $this->iid,
                        false,
                        $questionDuration
                    );
                }
            } elseif (
                in_array(
                    $answerType,
                    [
                        MULTIPLE_ANSWER,
                        GLOBAL_MULTIPLE_ANSWER,
                        MULTIPLE_ANSWER_DROPDOWN,
                        MULTIPLE_ANSWER_DROPDOWN_COMBINATION,
                    ]
                )
            ) {
                if ($choice != 0) {
                    if (in_array($answerType, [MULTIPLE_ANSWER_DROPDOWN, MULTIPLE_ANSWER_DROPDOWN_COMBINATION])) {
                        $reply = array_values($choice);
                    } else {
                        $reply = array_keys($choice);
                    }

                    for ($i = 0; $i < count($reply); $i++) {

It seems like you are calling the size function count() as part of the test condition. You might want to compute the size beforehand, and not on each iteration.

                        $ans = $reply[$i];
                        Event::saveQuestionAttempt(
                            $questionScore,
                            $ans,
                            $quesId,
                            $exeId,
                            $i,
                            $this->iid,
                            false,
                            $questionDuration
                        );
                    }
                } else {
                    Event::saveQuestionAttempt(
                        $questionScore,
                        0,
                        $quesId,
                        $exeId,
                        0,
                        $this->iid,
                        false,
                        $questionDuration
                    );
                }
            } elseif ($answerType == MULTIPLE_ANSWER_COMBINATION) {
                if ($choice != 0) {
                    $reply = array_keys($choice);
                    for ($i = 0; $i < count($reply); $i++) {

It seems like you are calling the size function count() as part of the test condition. You might want to compute the size beforehand, and not on each iteration.

                        $ans = $reply[$i];
                        Event::saveQuestionAttempt(
                            $questionScore,
                            $ans,
                            $quesId,
                            $exeId,
                            $i,
                            $this->iid,
                            false,
                            $questionDuration
                        );
                    }
                } else {
                    Event::saveQuestionAttempt(
                        $questionScore,
                        0,
                        $quesId,
                        $exeId,
                        0,
                        $this->iid,
                        false,
                        $questionDuration
                    );
                }
            } elseif (in_array($answerType, [MATCHING, MATCHING_COMBINATION, DRAGGABLE, MATCHING_DRAGGABLE, MATCHING_DRAGGABLE_COMBINATION])) {
                if (isset($matching)) {
                    foreach ($matching as $j => $val) {
                        Event::saveQuestionAttempt(
                            $questionScore,
                            $val,
                            $quesId,
                            $exeId,
                            $j,
                            $this->iid,
                            false,
                            $questionDuration
                        );
                    }
                }
            } elseif ($answerType == FREE_ANSWER) {
                $answer = $choice;
                Event::saveQuestionAttempt(
                    $questionScore,
                    $answer,
                    $quesId,
                    $exeId,
                    0,
                    $this->iid,
                    false,
                    $questionDuration
                );
            } elseif ($answerType == UPLOAD_ANSWER) {
                $answer = $choice;
                Event::saveQuestionAttempt(
                    $questionScore,
                    $answer,
                    $quesId,
                    $exeId,
                    0,
                    $this->iid,
                    false,
                    $questionDuration
                );
            } elseif ($answerType == ANSWER_IN_OFFICE_DOC) {
                $answer = $choice;
                $exerciseId = $this->iid;
                $questionId = $quesId;
                $originalFilePath = $objQuestionTmp->getFileUrl();
                $originalExtension = !empty($originalFilePath) ? pathinfo($originalFilePath, PATHINFO_EXTENSION) : 'docx';
                $fileName = "response_{$exeId}.{$originalExtension}";
                Event::saveQuestionAttempt(
                    $questionScore,
                    $answer,
                    $questionId,
                    $exeId,
                    0,
                    $exerciseId,
                    false,
                    $questionDuration,
                    $fileName
                );
            } elseif ($answerType == ORAL_EXPRESSION) {
                $answer = $choice;
                $absFilePath = $objQuestionTmp->getAbsoluteFilePath();
                if (empty($answer) && !empty($absFilePath)) {
                    // it takes the filename as answer to recognise has been saved
                    $answer = basename($absFilePath);
                }
                Event::saveQuestionAttempt(
                    $questionScore,
                    $answer,
                    $quesId,
                    $exeId,
                    0,
                    $this->iid,
                    false,
                    $questionDuration,
                    $absFilePath
                );
            } elseif (
                in_array(
                    $answerType,
                    [UNIQUE_ANSWER, UNIQUE_ANSWER_IMAGE, UNIQUE_ANSWER_NO_OPTION, READING_COMPREHENSION]
                )
            ) {
                $answer = $choice;
                Event::saveQuestionAttempt($questionScore, $answer, $quesId, $exeId, 0, $this->iid, false, $questionDuration);
            } elseif (in_array($answerType, [HOT_SPOT, HOT_SPOT_COMBINATION, ANNOTATION])) {
                $answer = [];
                if (isset($exerciseResultCoordinates[$questionId]) && !empty($exerciseResultCoordinates[$questionId])) {
                    if ($debug) {
                        error_log('Checking result coordinates');
                    }
                    Database::delete(
                        Database::get_main_table(TABLE_STATISTIC_TRACK_E_HOTSPOT),
                        [
                            'hotspot_exe_id = ? AND hotspot_question_id = ? AND c_id = ?' => [
                                $exeId,
                                $questionId,
                                api_get_course_int_id(),
                            ],
                        ]
                    );

                    foreach ($exerciseResultCoordinates[$questionId] as $idx => $val) {
                        $answer[] = $val;
                        $hotspotValue = (int) $choice[$idx] === 1 ? 1 : 0;
                        if ($debug) {
                            error_log('Hotspot value: '.$hotspotValue);
                        }
                        Event::saveExerciseAttemptHotspot(
                            $exeId,
                            $quesId,
                            $idx,
                            $hotspotValue,
                            $val,
                            false,
                            $this->iid,
                            $learnpath_id,
                            $learnpath_item_id
                        );
                    }
                } else {
                    if ($debug) {
                        error_log('Empty: exerciseResultCoordinates');
                    }
                }
                Event::saveQuestionAttempt(
                    $questionScore,
                    implode('|', $answer),
                    $quesId,
                    $exeId,
                    0,
                    $this->iid,
                    false,
                    $questionDuration
                );
            } else {
                if ($answerType === CALCULATED_ANSWER && !empty($calculatedAnswerId)) {
                    $answer .= ':::'.$calculatedAnswerId;
                }

                Event::saveQuestionAttempt(
                    $questionScore,
                    $answer,
                    $quesId,
                    $exeId,
                    0,
                    $this->iid,
                    false,
                    $questionDuration
                );
            }
        }

        if ($propagate_neg == 0 && $questionScore < 0) {
            $questionScore = 0;
        }

        if ($save_results) {
            $statsTable = Database::get_main_table(TABLE_STATISTIC_TRACK_E_EXERCISES);
            $sql = "UPDATE $statsTable SET
                        exe_result = exe_result + ".floatval($questionScore)."
                    WHERE exe_id = $exeId";
            Database::query($sql);
        }

        return [
            'score' => $questionScore,
            'weight' => $questionWeighting,
            'extra' => $extra_data,
            'open_question' => $arrques,
            'open_answer' => $arrans,
            'answer_type' => $answerType,
            'generated_oral_file' => $generatedFile,
            'user_answered' => $userAnsweredQuestion,
            'correct_answer_id' => $correctAnswerId,
            'answer_destination' => $answerDestination,
        ];
    }

    /**
     * Sends a notification when a user ends an examn.
     *
     * @param string $type                  'start' or 'end' of an exercise
     * @param array  $question_list_answers
     * @param string $origin
     * @param int    $exe_id
     * @param float  $score
     * @param float  $weight
     *
     * @return bool
     */
    public function send_mail_notification_for_exam(
        $type,
        $question_list_answers,
        $origin,
        $exe_id,
        $score = null,
        $weight = null
    ) {
        $setting = api_get_course_setting('email_alert_manager_on_new_quiz');

        if (empty($setting) && empty($this->getNotifications())) {
            return false;
        }

        $settingFromExercise = $this->getNotifications();
        if (!empty($settingFromExercise)) {
            $setting = $settingFromExercise;
        }

        // Email configuration settings
        $courseCode = api_get_course_id();
        $courseInfo = api_get_course_info($courseCode);

        if (empty($courseInfo)) {
            return false;
        }

        $sessionId = api_get_session_id();

        $sessionData = '';
        if (!empty($sessionId)) {
            $sessionInfo = api_get_session_info($sessionId);
            if (!empty($sessionInfo)) {
                $sessionData = '<tr>'
                    .'<td>'.get_lang('SessionName').'</td>'
                    .'<td>'.$sessionInfo['name'].'</td>'
                    .'</tr>';
            }
        }

        $sendStart = false;
        $sendEnd = false;
        $sendEndOpenQuestion = false;
        $sendEndOralQuestion = false;

        foreach ($setting as $option) {
            switch ($option) {
                case 0:
                    return false;
                    break;

break is not strictly necessary here and could be removed.

                case 1: // End
                    if ($type === 'end') {
                        $sendEnd = true;
                    }
                    break;
                case 2: // start
                    if ($type === 'start') {
                        $sendStart = true;
                    }
                    break;
                case 3: // end + open
                    if ($type === 'end') {
                        $sendEndOpenQuestion = true;
                    }
                    break;
                case 4: // end + oral
                    if ($type === 'end') {
                        $sendEndOralQuestion = true;
                    }
                    break;
            }
        }

        $user_info = api_get_user_info(api_get_user_id());
        $url = api_get_path(WEB_CODE_PATH).'exercise/exercise_show.php?'.
            api_get_cidreq(true, true, 'qualify').'&id='.$exe_id.'&action=qualify';

        if (!empty($sessionId)) {
            $addGeneralCoach = true;
            $setting = api_get_configuration_value('block_quiz_mail_notification_general_coach');
            if ($setting === true) {
                $addGeneralCoach = false;
            }
            $teachers = CourseManager::get_coach_list_from_course_code(
                $courseCode,
                $sessionId,
                $addGeneralCoach
            );
        } else {
            $teachers = CourseManager::get_teacher_list_from_course_code($courseCode);
        }

        if ($sendEndOpenQuestion) {
            $this->sendNotificationForOpenQuestions(
                $question_list_answers,
                $origin,
                $user_info,
                $url,
                $teachers
            );
        }

        if ($sendEndOralQuestion) {
            $this->sendNotificationForOralQuestions(
                $question_list_answers,
                $origin,
                $exe_id,
                $user_info,
                $url,
                $teachers
            );
        }

        if (!$sendEnd && !$sendStart) {
            return false;
        }

        $scoreLabel = '';
        if ($sendEnd &&
            api_get_configuration_value('send_score_in_exam_notification_mail_to_manager') == true
        ) {
            $notificationPercentage = api_get_configuration_value('send_notification_score_in_percentage');
            $scoreLabel = ExerciseLib::show_score($score, $weight, $notificationPercentage, true);
            $scoreLabel = "<tr>
                            <td>".get_lang('Score')."</td>
                            <td>&nbsp;$scoreLabel</td>
                        </tr>";
        }

        if ($sendEnd) {
            $msg = get_lang('ExerciseAttempted').'<br /><br />';
        } else {
            $msg = get_lang('StudentStartExercise').'<br /><br />';
        }

        $msg .= get_lang('AttemptDetails').' : <br /><br />
                    <table>
                        <tr>
                            <td>'.get_lang('CourseName').'</td>
                            <td>#course#</td>
                        </tr>
                        '.$sessionData.'
                        <tr>
                            <td>'.get_lang('Exercise').'</td>
                            <td>&nbsp;#exercise#</td>
                        </tr>
                        <tr>
                            <td>'.get_lang('StudentName').'</td>
                            <td>&nbsp;#student_complete_name#</td>
                        </tr>
                        <tr>
                            <td>'.get_lang('StudentEmail').'</td>
                            <td>&nbsp;#email#</td>
                        </tr>
                        '.$scoreLabel.'
                    </table>';

        $variables = [
            '#email#' => $user_info['email'],
            '#exercise#' => $this->exercise,
            '#student_complete_name#' => $user_info['complete_name'],
            '#course#' => Display::url(
                $courseInfo['title'],
                $courseInfo['course_public_url'].'?id_session='.$sessionId
            ),
        ];

        if ($sendEnd) {
            $msg .= '<br /><a href="#url#">'.get_lang('ClickToCommentAndGiveFeedback').'</a>';
            $variables['#url#'] = $url;
        }

        $content = str_replace(array_keys($variables), array_values($variables), $msg);

        if ($sendEnd) {
            $subject = get_lang('ExerciseAttempted');
        } else {
            $subject = get_lang('StudentStartExercise');
        }

        if (!empty($teachers)) {
            foreach ($teachers as $user_id => $teacher_data) {
                MessageManager::send_message_simple(
                    $user_id,
                    $subject,
                    $content
                );
            }
        }
    }

    /**
     * @param array $user_data         result of api_get_user_info()
     * @param array $trackExerciseInfo result of get_stat_track_exercise_info
     * @param bool  $saveUserResult
     * @param bool  $allowSignature
     * @param bool  $allowExportPdf
     *
     * @return string
     */
    public function showExerciseResultHeader(
        $user_data,
        $trackExerciseInfo,
        $saveUserResult,
        $allowSignature = false,
        $allowExportPdf = false
    ) {
        if (api_get_configuration_value('hide_user_info_in_quiz_result')) {
            return '';
        }

        $start_date = null;
        if (isset($trackExerciseInfo['start_date'])) {
            $start_date = api_convert_and_format_date($trackExerciseInfo['start_date']);
        }
        $duration = isset($trackExerciseInfo['duration_formatted']) ? $trackExerciseInfo['duration_formatted'] : null;
        $ip = isset($trackExerciseInfo['user_ip']) ? $trackExerciseInfo['user_ip'] : null;

        if (!empty($user_data)) {
            $userFullName = $user_data['complete_name'];
            if (api_is_teacher() || api_is_platform_admin(true, true)) {
                $userFullName = '<a href="'.$user_data['profile_url'].'" title="'.get_lang('GoToStudentDetails').'">'.
                    $user_data['complete_name'].'</a>';
            }

            $data = [
                'name_url' => $userFullName,
                'complete_name' => $user_data['complete_name'],
                'username' => $user_data['username'],
                'avatar' => $user_data['avatar_medium'],
                'url' => $user_data['profile_url'],
            ];

            if (!empty($user_data['official_code'])) {
                $data['code'] = $user_data['official_code'];
            }
        }
        // Description can be very long and is generally meant to explain
        //   rules *before* the exam. Leaving here to make display easier if
        //   necessary
        /*
        if (!empty($this->description)) {
            $array[] = array('title' => get_lang("Description"), 'content' => $this->description);
        }
        */
        if (!empty($start_date)) {
            $data['start_date'] = $start_date;
        }

        if (!empty($duration)) {
            $data['duration'] = $duration;
        }

        if (!empty($ip)) {
            $data['ip'] = $ip;
        }

        if (true === api_get_configuration_value('exercise_hide_ip')) {
            unset($data['ip']);
        }

        if (api_get_configuration_value('save_titles_as_html')) {
            $data['title'] = Security::remove_XSS($this->get_formated_title()).get_lang('Result');
        } else {
            $data['title'] = PHP_EOL.Security::remove_XSS($this->exercise).' : '.get_lang('Result');
        }

        $questionsCount = count(explode(',', $trackExerciseInfo['data_tracking']));
        $savedAnswersCount = $this->countUserAnswersSavedInExercise($trackExerciseInfo['exe_id']);

        $data['number_of_answers'] = $questionsCount;
        $data['number_of_answers_saved'] = $savedAnswersCount;
        $exeId = $trackExerciseInfo['exe_id'];

        if (false !== api_get_configuration_value('quiz_confirm_saved_answers')) {
            $em = Database::getManager();

            if ($saveUserResult) {
                $trackConfirmation = new TrackEExerciseConfirmation();
                $trackConfirmation
                    ->setUserId($trackExerciseInfo['exe_user_id'])
                    ->setQuizId($trackExerciseInfo['exe_exo_id'])
                    ->setAttemptId($trackExerciseInfo['exe_id'])
                    ->setQuestionsCount($questionsCount)
                    ->setSavedAnswersCount($savedAnswersCount)
                    ->setCourseId($trackExerciseInfo['c_id'])
                    ->setSessionId($trackExerciseInfo['session_id'])
                    ->setCreatedAt(api_get_utc_datetime(null, false, true));

                $em->persist($trackConfirmation);
                $em->flush();
            } else {
                $trackConfirmation = $em
                    ->getRepository('ChamiloCoreBundle:TrackEExerciseConfirmation')
                    ->findOneBy(
                        [
                            'attemptId' => $trackExerciseInfo['exe_id'],
                            'quizId' => $trackExerciseInfo['exe_exo_id'],
                            'courseId' => $trackExerciseInfo['c_id'],
                            'sessionId' => $trackExerciseInfo['session_id'],
                        ]
                    );
            }

            $data['track_confirmation'] = $trackConfirmation;
        }

        $signature = '';
        if (ExerciseSignaturePlugin::exerciseHasSignatureActivated($this)) {
            $signature = ExerciseSignaturePlugin::getSignature($trackExerciseInfo['exe_user_id'], $trackExerciseInfo);
        }

        $tpl = new Template(null, false, false, false, false, false, false);
        $tpl->assign('data', $data);
        $tpl->assign('allow_signature', $allowSignature);
        $tpl->assign('signature', $signature);
        $tpl->assign('allow_export_pdf', $allowExportPdf);
        $tpl->assign('export_url', api_get_path(WEB_CODE_PATH).'exercise/result.php?action=export&id='.$exeId.'&'.api_get_cidreq());

        $layoutTemplate = $tpl->get_template('exercise/partials/result_exercise.tpl');

        return $tpl->fetch($layoutTemplate);
    }

    /**
     * Returns the exercise result.
     *
     * @param 	int		attempt id
     *
     * @return array
     */
    public function get_exercise_result($exe_id)
    {
        $result = [];
        $track_exercise_info = ExerciseLib::get_exercise_track_exercise_info($exe_id);

        if (!empty($track_exercise_info)) {
            $totalScore = 0;
            $objExercise = new self();
            $objExercise->read($track_exercise_info['exe_exo_id']);
            if (!empty($track_exercise_info['data_tracking'])) {
                $question_list = explode(',', $track_exercise_info['data_tracking']);
            }
            foreach ($question_list as $questionId) {
                $question_result = $objExercise->manage_answer(
                    $exe_id,
                    $questionId,
                    '',
                    'exercise_show',
                    [],
                    false,
                    true,
                    false,
                    $objExercise->selectPropagateNeg()
                );
                $totalScore += $question_result['score'];
            }

            if ($objExercise->selectPropagateNeg() == 0 && $totalScore < 0) {
                $totalScore = 0;
            }
            $result = [
                'score' => $totalScore,
                'weight' => $track_exercise_info['exe_weighting'],
            ];
        }

        return $result;
    }

    /**
     * Checks if the exercise is visible due a lot of conditions
     * visibility, time limits, student attempts
     * Return associative array
     * value : true if exercise visible
     * message : HTML formatted message
     * rawMessage : text message.
     *
     * @param int  $lpId
     * @param int  $lpItemId
     * @param int  $lpItemViewId
     * @param bool $filterByAdmin
     *
     * @return array
     */
    public function is_visible(
        $lpId = 0,
        $lpItemId = 0,
        $lpItemViewId = 0,
        $filterByAdmin = true,
        $sessionId = 0
    ) {
        $sessionId = (int) $sessionId;
        if ($sessionId == 0) {
            $sessionId = $this->sessionId;
        }
        // 1. By default the exercise is visible
        $isVisible = true;
        $message = null;

        // 1.1 Admins, teachers and tutors can access to the exercise
        if ($filterByAdmin) {
            if (api_is_platform_admin() || api_is_course_admin() || api_is_course_tutor() || api_is_session_general_coach()) {
                return ['value' => true, 'message' => ''];
            }
        }

        // Deleted exercise.
        if ($this->active == -1) {
            return [
                'value' => false,
                'message' => Display::return_message(
                    get_lang('ExerciseNotFound'),
                    'warning',
                    false
                ),
                'rawMessage' => get_lang('ExerciseNotFound'),
            ];
        }

        // Checking visibility in the item_property table.
        $visibility = api_get_item_visibility(
            api_get_course_info(),
            TOOL_QUIZ,
            $this->iid,
            api_get_session_id()
        );

        if ($visibility == 0 || $visibility == 2) {
            $this->active = 0;
        }

        // 2. If the exercise is not active.
        if (empty($lpId)) {
            // 2.1 LP is OFF
            if ($this->active == 0) {
                return [
                    'value' => false,
                    'message' => Display::return_message(
                        get_lang('ExerciseNotFound'),
                        'warning',
                        false
                    ),
                    'rawMessage' => get_lang('ExerciseNotFound'),
                ];
            }
        } else {
            // 2.1 LP is loaded
            if ($this->active == 0 &&
                !learnpath::is_lp_visible_for_student($lpId, api_get_user_id())
            ) {
                return [
                    'value' => false,
                    'message' => Display::return_message(
                        get_lang('ExerciseNotFound'),
                        'warning',
                        false
                    ),
                    'rawMessage' => get_lang('ExerciseNotFound'),
                ];
            }
        }

        // 3. We check if the time limits are on
        $limitTimeExists = false;
        if (!empty($this->start_time) || !empty($this->end_time)) {
            $limitTimeExists = true;
        }

        if ($limitTimeExists) {
            $timeNow = time();
            $existsStartDate = false;
            $nowIsAfterStartDate = true;
            $existsEndDate = false;
            $nowIsBeforeEndDate = true;

            if (!empty($this->start_time)) {
                $existsStartDate = true;
            }

            if (!empty($this->end_time)) {
                $existsEndDate = true;
            }

            // check if we are before-or-after end-or-start date
            if ($existsStartDate && $timeNow < api_strtotime($this->start_time, 'UTC')) {
                $nowIsAfterStartDate = false;
            }

            if ($existsEndDate & $timeNow >= api_strtotime($this->end_time, 'UTC')) {
                $nowIsBeforeEndDate = false;
            }

            // lets check all cases
            if ($existsStartDate && !$existsEndDate) {
                // exists start date and dont exists end date
                if ($nowIsAfterStartDate) {
                    // after start date, no end date
                    $isVisible = true;
                    $message = sprintf(
                        get_lang('ExerciseAvailableSinceX'),
                        api_convert_and_format_date($this->start_time)
                    );
                } else {
                    // before start date, no end date
                    $isVisible = false;
                    $message = sprintf(
                        get_lang('ExerciseAvailableFromX'),
                        api_convert_and_format_date($this->start_time)
                    );
                }
            } elseif (!$existsStartDate && $existsEndDate) {
                // doesnt exist start date, exists end date
                if ($nowIsBeforeEndDate) {
                    // before end date, no start date
                    $isVisible = true;
                    $message = sprintf(
                        get_lang('ExerciseAvailableUntilX'),
                        api_convert_and_format_date($this->end_time)
                    );
                } else {
                    // after end date, no start date
                    $isVisible = false;
                    $message = sprintf(
                        get_lang('ExerciseAvailableUntilX'),
                        api_convert_and_format_date($this->end_time)
                    );
                }
            } elseif ($existsStartDate && $existsEndDate) {
                // exists start date and end date
                if ($nowIsAfterStartDate) {
                    if ($nowIsBeforeEndDate) {
                        // after start date and before end date
                        $isVisible = true;
                        $message = sprintf(
                            get_lang('ExerciseIsActivatedFromXToY'),
                            api_convert_and_format_date($this->start_time),
                            api_convert_and_format_date($this->end_time)
                        );
                    } else {
                        // after start date and after end date
                        $isVisible = false;
                        $message = sprintf(
                            get_lang('ExerciseWasActivatedFromXToY'),
                            api_convert_and_format_date($this->start_time),
                            api_convert_and_format_date($this->end_time)
                        );
                    }
                } else {
                    if ($nowIsBeforeEndDate) {
                        // before start date and before end date
                        $isVisible = false;
                        $message = sprintf(
                            get_lang('ExerciseWillBeActivatedFromXToY'),
                            api_convert_and_format_date($this->start_time),
                            api_convert_and_format_date($this->end_time)
                        );
                    }
                    // case before start date and after end date is impossible
                }
            } elseif (!$existsStartDate && !$existsEndDate) {
                // doesnt exist start date nor end date
                $isVisible = true;
                $message = '';
            }
        }

        $remedialCoursePlugin = RemedialCoursePlugin::create();

        // BT#18165
        $exerciseAttempts = $this->selectAttempts();
        if ($exerciseAttempts > 0) {
            $userId = api_get_user_id();
            $attemptCount = Event::get_attempt_count_not_finished(
                $userId,
                $this->iid,
                $lpId,
                $lpItemId,
                $lpItemViewId
            );
            $message .= $remedialCoursePlugin->getAdvancedCourseList(
                $this,
                $userId,
                api_get_session_id(),
                $lpId ?: 0,
                $lpItemId ?: 0
            );
            if ($attemptCount >= $exerciseAttempts) {
                $message .= $remedialCoursePlugin->getRemedialCourseList(
                    $this,
                    $userId,
                    api_get_session_id(),
                    false,
                    $lpId ?: 0,
                    $lpItemId ?: 0
                );
            }
        }
        // 4. We check if the student have attempts
        if ($isVisible) {
            $exerciseAttempts = $this->selectAttempts();

            if ($exerciseAttempts > 0) {
                $attemptCount = Event::get_attempt_count_not_finished(
                    api_get_user_id(),
                    $this->iid,
                    $lpId,
                    $lpItemId,
                    $lpItemViewId
                );

                if ($attemptCount >= $exerciseAttempts) {
                    $message = sprintf(
                        get_lang('ReachedMaxAttempts'),
                        $this->name,
                        $exerciseAttempts
                    );
                    $isVisible = false;
                } else {
                    // Check blocking exercise.
                    $extraFieldValue = new ExtraFieldValue('exercise');
                    $blockExercise = $extraFieldValue->get_values_by_handler_and_field_variable(
                        $this->iid,
                        'blocking_percentage'
                    );
                    if ($blockExercise && isset($blockExercise['value']) && !empty($blockExercise['value'])) {
                        $blockPercentage = (int) $blockExercise['value'];
                        $userAttempts = Event::getExerciseResultsByUser(
                            api_get_user_id(),
                            $this->iid,
                            $this->course_id,
                            $sessionId,
                            $lpId,
                            $lpItemId
                        );

                        if (!empty($userAttempts)) {
                            $currentAttempt = current($userAttempts);
                            if ($currentAttempt['total_percentage'] <= $blockPercentage) {
                                $message = sprintf(
                                    get_lang('ExerciseBlockBecausePercentageX'),
                                    $blockPercentage
                                );
                                $isVisible = false; // See BT#18165
                                $message .= $remedialCoursePlugin->getRemedialCourseList(
                                    $this,
                                    api_get_user_id(),
                                    api_get_session_id(),
                                    false,
                                    $lpId,
                                    $lpItemId
                                );
                            }
                        }
                    }
                }
            }
        }

        $rawMessage = '';
        if (!empty($message)) {
            $rawMessage = $message;
            $message = Display::return_message($message, 'warning', false);
        }

        return [
            'value' => $isVisible,
            'message' => $message,
            'rawMessage' => $rawMessage,
        ];
    }

    /**
     * @return bool
     */
    public function added_in_lp()
    {
        $TBL_LP_ITEM = Database::get_course_table(TABLE_LP_ITEM);
        $sql = "SELECT max_score FROM $TBL_LP_ITEM
                WHERE
                    c_id = {$this->course_id} AND
                    item_type = '".TOOL_QUIZ."' AND
                    path = '{$this->iid}'";
        $result = Database::query($sql);
        if (Database::num_rows($result) > 0) {
            return true;
        }

        return false;
    }

    /**
     * Returns an array with this form.
     *
     * @example
     * <code>
     * array (size=3)
     * 999 =>
     * array (size=3)
     * 0 => int 3422
     * 1 => int 3423
     * 2 => int 3424
     * 100 =>
     * array (size=2)
     * 0 => int 3469
     * 1 => int 3470
     * 101 =>
     * array (size=1)
     * 0 => int 3482
     * </code>
     * The array inside the key 999 means the question list that belongs to the media id = 999,
     * this case is special because 999 means "no media".
     *
     * @return array
     */
    public function getMediaList()
    {
        return $this->mediaList;
    }

    /**
     * Is media question activated?
     *
     * @return bool
     */
    public function mediaIsActivated()
    {
        $mediaQuestions = $this->getMediaList();
        $active = false;
        if (isset($mediaQuestions) && !empty($mediaQuestions)) {
            $media_count = count($mediaQuestions);
            if ($media_count > 1) {
                return true;
            } elseif ($media_count == 1) {
                if (isset($mediaQuestions[999])) {
                    return false;
                } else {
                    return true;
                }
            }
        }

        return $active;
    }

    /**
     * Gets question list from the exercise.
     *
     * @return array
     */
    public function getQuestionList()
    {
        return $this->questionList;
    }

    /**
     * Question list with medias compressed like this.
     *
     * @example
     * <code>
     * array(
     *      question_id_1,
     *      question_id_2,
     *      media_id, <- this media id contains question ids
     *      question_id_3,
     * )
     * </code>
     *
     * @return array
     */
    public function getQuestionListWithMediasCompressed()
    {
        return $this->questionList;
    }

    /**
     * Question list with medias uncompressed like this.
     *
     * @example
     * <code>
     * array(
     *      question_id,
     *      question_id,
     *      question_id, <- belongs to a media id
     *      question_id, <- belongs to a media id
     *      question_id,
     * )
     * </code>
     *
     * @return array
     */
    public function getQuestionListWithMediasUncompressed()
    {
        return $this->questionListUncompressed;
    }

    /**
     * Sets the question list when the exercise->read() is executed.
     *
     * @param bool $adminView Whether to view the set the list of *all* questions or just the normal student view
     */
    public function setQuestionList($adminView = false)
    {
        // Getting question list.
        $questionList = $this->selectQuestionList(true, $adminView);
        $this->setMediaList($questionList);
        $this->questionList = $this->transformQuestionListWithMedias($questionList, false);
        $this->questionListUncompressed = $this->transformQuestionListWithMedias(
            $questionList,
            true
        );
    }

    /**
     * @params array question list
     * @params bool expand or not question list (true show all questions,
     * false show media question id instead of the question ids)
     */
    public function transformQuestionListWithMedias(
        $question_list,
        $expand_media_questions = false
    ) {
        $new_question_list = [];
        if (!empty($question_list)) {
            $media_questions = $this->getMediaList();
            $media_active = $this->mediaIsActivated($media_questions);

            if ($media_active) {
                $counter = 1;
                foreach ($question_list as $question_id) {
                    $add_question = true;
                    foreach ($media_questions as $media_id => $question_list_in_media) {
                        if ($media_id != 999 && in_array($question_id, $question_list_in_media)) {
                            $add_question = false;
                            if (!in_array($media_id, $new_question_list)) {
                                $new_question_list[$counter] = $media_id;
                                $counter++;
                            }
                            break;
                        }
                    }
                    if ($add_question) {
                        $new_question_list[$counter] = $question_id;
                        $counter++;
                    }
                }
                if ($expand_media_questions) {
                    $media_key_list = array_keys($media_questions);
                    foreach ($new_question_list as &$question_id) {
                        if (in_array($question_id, $media_key_list)) {
                            $question_id = $media_questions[$question_id];
                        }
                    }
                    $new_question_list = array_flatten($new_question_list);
                }
            } else {
                $new_question_list = $question_list;
            }
        }

        return $new_question_list;
    }

    /**
     * Get sorted question list based on the random order settings.
     *
     * @return array
     */
    public function get_validated_question_list()
    {
        $isRandomByCategory = $this->isRandomByCat();
        if ($isRandomByCategory == 0) {
            if ($this->isRandom()) {
                return $this->getRandomList();
            }

            return $this->selectQuestionList();
        }

        if ($this->isRandom()) {
            // USE question categories
            // get questions by category for this exercise
            // we have to choice $objExercise->random question in each array values of $categoryQuestions
            // key of $categoryQuestions are the categopy id (0 for not in a category)
            // value is the array of question id of this category
            $questionList = [];
            $categoryQuestions = TestCategory::getQuestionsByCat($this->iid);
            $isRandomByCategory = $this->getRandomByCategory();
            // We sort categories based on the term between [] in the head
            // of the category's description
            /* examples of categories :
             * [biologie] Maitriser les mecanismes de base de la genetique
             * [biologie] Relier les moyens de depenses et les agents infectieux
             * [biologie] Savoir ou est produite l'enrgie dans les cellules et sous quelle forme
             * [chimie] Classer les molles suivant leur pouvoir oxydant ou reacteur
             * [chimie] Connaître la denition de la theoie acide/base selon Brönsted
             * [chimie] Connaître les charges des particules
             * We want that in the order of the groups defined by the term
             * between brackets at the beginning of the category title
            */
            // If test option is Grouped By Categories
            if ($isRandomByCategory == 2) {
                $categoryQuestions = TestCategory::sortTabByBracketLabel($categoryQuestions);
            }
            foreach ($categoryQuestions as $question) {
                $number_of_random_question = $this->random;
                if ($this->random == -1) {
                    $number_of_random_question = count($this->questionList);
                }
                $questionList = array_merge(
                    $questionList,
                    TestCategory::getNElementsFromArray(
                        $question,
                        $number_of_random_question
                    )
                );
            }
            // shuffle the question list if test is not grouped by categories
            if ($isRandomByCategory == 1) {
                shuffle($questionList); // or not
            }

            return $questionList;
        }

        // Problem, random by category has been selected and
        // we have no $this->isRandom number of question selected
        // Should not happened

        return [];
    }

    public function get_question_list($expand_media_questions = false)
    {
        $question_list = $this->get_validated_question_list();
        $question_list = $this->transform_question_list_with_medias($question_list, $expand_media_questions);

        return $question_list;
    }

    public function transform_question_list_with_medias($question_list, $expand_media_questions = false)
    {
        $new_question_list = [];
        if (!empty($question_list)) {
            $media_questions = $this->getMediaList();
            $media_active = $this->mediaIsActivated($media_questions);

            if ($media_active) {
                $counter = 1;
                foreach ($question_list as $question_id) {
                    $add_question = true;
                    foreach ($media_questions as $media_id => $question_list_in_media) {
                        if ($media_id != 999 && in_array($question_id, $question_list_in_media)) {
                            $add_question = false;
                            if (!in_array($media_id, $new_question_list)) {
                                $new_question_list[$counter] = $media_id;
                                $counter++;
                            }
                            break;
                        }
                    }
                    if ($add_question) {
                        $new_question_list[$counter] = $question_id;
                        $counter++;
                    }
                }
                if ($expand_media_questions) {
                    $media_key_list = array_keys($media_questions);
                    foreach ($new_question_list as &$question_id) {
                        if (in_array($question_id, $media_key_list)) {
                            $question_id = $media_questions[$question_id];
                        }
                    }
                    $new_question_list = array_flatten($new_question_list);
                }
            } else {
                $new_question_list = $question_list;
            }
        }

        return $new_question_list;
    }

    /**
     * @param int $exe_id
     *
     * @return array
     */
    public function get_stat_track_exercise_info_by_exe_id($exe_id)
    {
        $table = Database::get_main_table(TABLE_STATISTIC_TRACK_E_EXERCISES);
        $exe_id = (int) $exe_id;
        $sql_track = "SELECT * FROM $table WHERE exe_id = $exe_id ";
        $result = Database::query($sql_track);
        $new_array = [];
        if (Database::num_rows($result) > 0) {
            $new_array = Database::fetch_array($result, 'ASSOC');
            $start_date = api_get_utc_datetime($new_array['start_date'], true);
            $end_date = api_get_utc_datetime($new_array['exe_date'], true);
            $new_array['duration_formatted'] = '';
            if (!empty($new_array['exe_duration']) && !empty($start_date) && !empty($end_date)) {
                $time = api_format_time($new_array['exe_duration'], 'js');
                $new_array['duration_formatted'] = $time;
            }
        }

        return $new_array;
    }

    /**
     * @param int $exeId
     *
     * @return bool
     */
    public function removeAllQuestionToRemind($exeId)
    {
        $table = Database::get_main_table(TABLE_STATISTIC_TRACK_E_EXERCISES);
        $exeId = (int) $exeId;
        if (empty($exeId)) {
            return false;
        }
        $sql = "UPDATE $table
                SET questions_to_check = ''
                WHERE exe_id = $exeId ";
        Database::query($sql);

        return true;
    }

    /**
     * @param int   $exeId
     * @param array $questionList
     *
     * @return bool
     */
    public function addAllQuestionToRemind($exeId, $questionList = [])
    {
        $exeId = (int) $exeId;
        if (empty($questionList)) {
            return false;
        }

        $questionListToString = implode(',', $questionList);
        $questionListToString = Database::escape_string($questionListToString);

        $table = Database::get_main_table(TABLE_STATISTIC_TRACK_E_EXERCISES);
        $sql = "UPDATE $table
                SET questions_to_check = '$questionListToString'
                WHERE exe_id = $exeId";
        Database::query($sql);

        return true;
    }

    /**
     * @param int    $exeId
     * @param int    $questionId
     * @param string $action
     */
    public function editQuestionToRemind($exeId, $questionId, $action = 'add')
    {
        $exercise_info = self::get_stat_track_exercise_info_by_exe_id($exeId);
        $questionId = (int) $questionId;
        $exeId = (int) $exeId;

        if ($exercise_info) {
            $track_exercises = Database::get_main_table(TABLE_STATISTIC_TRACK_E_EXERCISES);
            if (empty($exercise_info['questions_to_check'])) {
                if ($action === 'add') {
                    $sql = "UPDATE $track_exercises
                            SET questions_to_check = '$questionId'
                            WHERE exe_id = $exeId ";
                    Database::query($sql);
                }
            } else {
                $remind_list = explode(',', $exercise_info['questions_to_check']);
                $remind_list_string = '';
                if ($action === 'add') {
                    if (!in_array($questionId, $remind_list)) {
                        $newRemindList = [];
                        $remind_list[] = $questionId;
                        $questionListInSession = Session::read('questionList');
                        if (!empty($questionListInSession)) {
                            foreach ($questionListInSession as $originalQuestionId) {
                                if (in_array($originalQuestionId, $remind_list)) {
                                    $newRemindList[] = $originalQuestionId;
                                }
                            }
                        }
                        $remind_list_string = implode(',', $newRemindList);
                    }
                } elseif ($action === 'delete') {
                    if (!empty($remind_list)) {
                        if (in_array($questionId, $remind_list)) {
                            $remind_list = array_flip($remind_list);
                            unset($remind_list[$questionId]);
                            $remind_list = array_flip($remind_list);

                            if (!empty($remind_list)) {
                                sort($remind_list);
                                array_filter($remind_list);
                                $remind_list_string = implode(',', $remind_list);
                            }
                        }
                    }
                }
                $value = Database::escape_string($remind_list_string);
                $sql = "UPDATE $track_exercises
                        SET questions_to_check = '$value'
                        WHERE exe_id = $exeId ";
                Database::query($sql);
            }
        }
    }

    /**
     * @param string $answer
     *
     * @return mixed
     */
    public function fill_in_blank_answer_to_array($answer)
    {
        $listStudentResults = FillBlanks::getAnswerInfo(
            $answer,
            true
        );
        $teacherAnswerList = $listStudentResults['student_answer'];

        return $teacherAnswerList;
    }

    /**
     * @param string $answer
     *
     * @return string
     */
    public function fill_in_blank_answer_to_string($answer)
    {
        $teacher_answer_list = $this->fill_in_blank_answer_to_array($answer);
        $result = '';
        if (!empty($teacher_answer_list)) {
            foreach ($teacher_answer_list as $teacher_item) {
                // Cleaning student answer list
                $value = strip_tags($teacher_item);
                if (strlen($value) > 2 && false !== strpos($value, '/')) {
                    $value = api_substr($value, 1, api_strlen($value) - 2);
                    $value = explode('/', $value);
                    if (!empty($value[0])) {
                        $value = trim($value[0]);
                        $value = str_replace('&nbsp;', '', $value);
                        $result .= $value;
                    }
                } else {
                    $result .= $value;
                }
            }
        }

        return $result;
    }

    /**
     * @return string
     */
    public function returnTimeLeftDiv()
    {
        $html = '<div id="clock_warning" style="display:none">';
        $html .= Display::return_message(
            get_lang('ReachedTimeLimit'),
            'warning'
        );
        $html .= ' ';
        $html .= sprintf(
            get_lang('YouWillBeRedirectedInXSeconds'),
            '<span id="counter_to_redirect" class="red_alert"></span>'
        );
        $html .= '</div>';

        $icon = Display::returnFontAwesomeIcon('clock-o');
        $html .= '<div class="count_down">
                    '.get_lang('RemainingTimeToFinishExercise').'
                    '.$icon.'<span id="exercise_clock_warning"></span>
                </div>';

        return $html;
    }

    /**
     * Get categories added in the exercise--category matrix.
     *
     * @return array
     */
    public function getCategoriesInExercise()
    {
        $table = Database::get_course_table(TABLE_QUIZ_REL_CATEGORY);
        if (!empty($this->iid)) {
            $sql = "SELECT * FROM $table
                    WHERE exercise_id = {$this->iid} AND c_id = {$this->course_id} ";
            $result = Database::query($sql);
            $list = [];
            if (Database::num_rows($result)) {
                while ($row = Database::fetch_array($result, 'ASSOC')) {
                    $list[$row['category_id']] = $row;
                }

                return $list;
            }
        }

        return [];
    }

    /**
     * Get total number of question that will be parsed when using the category/exercise.
     *
     * @return int
     */
    public function getNumberQuestionExerciseCategory()
    {
        $table = Database::get_course_table(TABLE_QUIZ_REL_CATEGORY);
        if (!empty($this->iid)) {
            $sql = "SELECT SUM(count_questions) count_questions
                    FROM $table
                    WHERE exercise_id = {$this->iid} AND c_id = {$this->course_id}";
            $result = Database::query($sql);
            if (Database::num_rows($result)) {
                $row = Database::fetch_array($result);

                return (int) $row['count_questions'];
            }
        }

        return 0;
    }

    /**
     * Save categories in the TABLE_QUIZ_REL_CATEGORY table.
     *
     * @param array $categories
     */
    public function save_categories_in_exercise($categories)
    {
        if (!empty($categories) && !empty($this->iid)) {
            $table = Database::get_course_table(TABLE_QUIZ_REL_CATEGORY);
            $sql = "DELETE FROM $table
                    WHERE exercise_id = {$this->iid} AND c_id = {$this->course_id}";
            Database::query($sql);
            if (!empty($categories)) {
                foreach ($categories as $categoryId => $countQuestions) {
                    $params = [
                        'c_id' => $this->course_id,
                        'exercise_id' => $this->iid,
                        'category_id' => $categoryId,
                        'count_questions' => $countQuestions,
                    ];
                    Database::insert($table, $params);
                }
            }
        }
    }

    /**
     * @param array  $questionList
     * @param int    $currentQuestion
     * @param array  $conditions
     * @param string $link
     *
     * @return string
     */
    public function progressExercisePaginationBar(
        $questionList,
        $currentQuestion,
        $conditions,
        $link
    ) {
        $mediaQuestions = $this->getMediaList();

        $html = '<div class="exercise_pagination pagination pagination-mini"><ul>';
        $counter = 0;
        $nextValue = 0;
        $wasMedia = false;
        $before = 0;
        $counterNoMedias = 0;
        foreach ($questionList as $questionId) {
            $isCurrent = $currentQuestion == ($counterNoMedias + 1) ? true : false;

            if (!empty($nextValue)) {
                if ($wasMedia) {
                    $nextValue = $nextValue - $before + 1;
                }
            }

            if (isset($mediaQuestions) && isset($mediaQuestions[$questionId])) {
                $fixedValue = $counterNoMedias;

                $html .= Display::progressPaginationBar(
                    $nextValue,
                    $mediaQuestions[$questionId],
                    $currentQuestion,
                    $fixedValue,
                    $conditions,
                    $link,
                    true,
                    true
                );

                $counter += count($mediaQuestions[$questionId]) - 1;
                $before = count($questionList);
                $wasMedia = true;
                $nextValue += count($questionList);
            } else {
                $html .= Display::parsePaginationItem(
                    $questionId,
                    $isCurrent,
                    $conditions,
                    $link,
                    $counter
                );
                $counter++;
                $nextValue++;
                $wasMedia = false;
            }
            $counterNoMedias++;
        }
        $html .= '</ul></div>';

        return $html;
    }

    /**
     *  Shows a list of numbers that represents the question to answer in a exercise.
     *
     * @param array  $categories
     * @param int    $current
     * @param array  $conditions
     * @param string $link
     *
     * @return string
     */
    public function progressExercisePaginationBarWithCategories(
        $categories,
        $current,
        $conditions = [],
        $link = null
    ) {
        $html = null;
        $counterNoMedias = 0;
        $nextValue = 0;
        $wasMedia = false;
        $before = 0;

        if (!empty($categories)) {
            $selectionType = $this->getQuestionSelectionType();
            $useRootAsCategoryTitle = false;

            // Grouping questions per parent category see BT#6540
            if (in_array(
                $selectionType,
                [
                    EX_Q_SELECTION_CATEGORIES_ORDERED_BY_PARENT_QUESTIONS_ORDERED,
                    EX_Q_SELECTION_CATEGORIES_ORDERED_BY_PARENT_QUESTIONS_RANDOM,
                ]
            )) {
                $useRootAsCategoryTitle = true;
            }

            // If the exercise is set to only show the titles of the categories
            // at the root of the tree, then pre-order the categories tree by
            // removing children and summing their questions into the parent
            // categories
            if ($useRootAsCategoryTitle) {
                // The new categories list starts empty
                $newCategoryList = [];
                foreach ($categories as $category) {
                    $rootElement = $category['root'];

                    if (isset($category['parent_info'])) {
                        $rootElement = $category['parent_info']['iid'];
                    }

                    //$rootElement = $category['iid'];
                    // If the current category's ancestor was never seen
                    // before, then declare it and assign the current
                    // category to it.
                    if (!isset($newCategoryList[$rootElement])) {
                        $newCategoryList[$rootElement] = $category;
                    } else {
                        // If it was already seen, then merge the previous with
                        // the current category
                        $oldQuestionList = $newCategoryList[$rootElement]['question_list'];
                        $category['question_list'] = array_merge($oldQuestionList, $category['question_list']);
                        $newCategoryList[$rootElement] = $category;
                    }
                }
                // Now use the newly built categories list, with only parents
                $categories = $newCategoryList;
            }

            foreach ($categories as $category) {
                $questionList = $category['question_list'];
                // Check if in this category there questions added in a media
                $mediaQuestionId = $category['media_question'];
                $isMedia = false;
                $fixedValue = null;

                // Media exists!
                if ($mediaQuestionId != 999) {
                    $isMedia = true;
                    $fixedValue = $counterNoMedias;
                }

                //$categoryName = $category['path']; << show the path
                $categoryName = $category['name'];

                if ($useRootAsCategoryTitle) {
                    if (isset($category['parent_info'])) {
                        $categoryName = $category['parent_info']['title'];
                    }
                }
                $html .= '<div class="row">';
                $html .= '<div class="span2">'.$categoryName.'</div>';
                $html .= '<div class="span8">';

                if (!empty($nextValue)) {
                    if ($wasMedia) {
                        $nextValue = $nextValue - $before + 1;
                    }
                }
                $html .= Display::progressPaginationBar(
                    $nextValue,
                    $questionList,
                    $current,
                    $fixedValue,
                    $conditions,
                    $link,
                    $isMedia,
                    true
                );
                $html .= '</div>';
                $html .= '</div>';

                if ($mediaQuestionId == 999) {
                    $counterNoMedias += count($questionList);
                } else {
                    $counterNoMedias++;
                }

                $nextValue += count($questionList);
                $before = count($questionList);

                if ($mediaQuestionId != 999) {
                    $wasMedia = true;
                } else {
                    $wasMedia = false;
                }
            }
        }

        return $html;
    }

    /**
     * Renders a question list.
     *
     * @param array $questionList    (with media questions compressed)
     * @param int   $currentQuestion
     * @param array $exerciseResult
     * @param array $attemptList
     * @param array $remindList
     */
    public function renderQuestionList(
        $questionList,
        $currentQuestion,
        $exerciseResult,
        $attemptList,
        $remindList
    ) {
        $mediaQuestions = $this->getMediaList();
        $i = 0;

        // Normal question list render (medias compressed)
        foreach ($questionList as $questionId) {
            $i++;
            // For sequential exercises

            if ($this->type == ONE_PER_PAGE) {
                // If it is not the right question, goes to the next loop iteration
                if ($currentQuestion != $i) {
                    continue;
                } else {
                    if (!in_array(
                        $this->getFeedbackType(),
                        [EXERCISE_FEEDBACK_TYPE_DIRECT, EXERCISE_FEEDBACK_TYPE_POPUP]
                    )) {
                        // if the user has already answered this question
                        if (isset($exerciseResult[$questionId])) {
                            echo Display::return_message(
                                get_lang('AlreadyAnswered'),
                                'normal'
                            );
                            break;
                        }
                    }
                }
            }

            // The $questionList contains the media id we check
            // if this questionId is a media question type
            if (isset($mediaQuestions[$questionId]) &&
                $mediaQuestions[$questionId] != 999
            ) {
                // The question belongs to a media
                $mediaQuestionList = $mediaQuestions[$questionId];
                $objQuestionTmp = Question::read($questionId);

                $counter = 1;
                if ($objQuestionTmp->type == MEDIA_QUESTION) {
                    echo $objQuestionTmp->show_media_content();

                    $countQuestionsInsideMedia = count($mediaQuestionList);

                    // Show questions that belongs to a media
                    if (!empty($mediaQuestionList)) {
                        // In order to parse media questions we use letters a, b, c, etc.
                        $letterCounter = 97;
                        foreach ($mediaQuestionList as $questionIdInsideMedia) {
                            $isLastQuestionInMedia = false;
                            if ($counter == $countQuestionsInsideMedia) {
                                $isLastQuestionInMedia = true;
                            }
                            $this->renderQuestion(
                                $questionIdInsideMedia,
                                $attemptList,
                                $remindList,
                                chr($letterCounter),
                                $currentQuestion,
                                $mediaQuestionList,
                                $isLastQuestionInMedia,
                                $questionList
                            );
                            $letterCounter++;
                            $counter++;
                        }
                    }
                } else {
                    $this->renderQuestion(
                        $questionId,
                        $attemptList,
                        $remindList,
                        $i,
                        $currentQuestion,
                        null,
                        null,
                        $questionList
                    );
                    $i++;
                }
            } else {
                // Normal question render.
                $this->renderQuestion(
                    $questionId,
                    $attemptList,
                    $remindList,
                    $i,
                    $currentQuestion,
                    null,
                    null,
                    $questionList
                );
            }

            // For sequential exercises.
            if ($this->type == ONE_PER_PAGE) {
                // quits the loop
                break;
            }
        }
        // end foreach()

        if ($this->type == ALL_ON_ONE_PAGE) {
            $exercise_actions = $this->show_button($questionId, $currentQuestion);
            echo Display::div($exercise_actions, ['class' => 'exercise_actions']);
        }
    }

    /**
     * @param int   $questionId
     * @param array $attemptList
     * @param array $remindList
     * @param int   $i
     * @param int   $current_question
     * @param array $questions_in_media
     * @param bool  $last_question_in_media
     * @param array $realQuestionList
     * @param bool  $generateJS
     */
    public function renderQuestion(
        $questionId,
        $attemptList,
        $remindList,
        $i,
        $current_question,
        $questions_in_media = [],
        $last_question_in_media = false,
        $realQuestionList = [],
        $generateJS = true
    ) {
        // With this option on the question is loaded via AJAX
        //$generateJS = true;
        //$this->loadQuestionAJAX = true;

        if ($generateJS && $this->loadQuestionAJAX) {
            $url = api_get_path(WEB_AJAX_PATH).'exercise.ajax.php?a=get_question&id='.$questionId.'&'.api_get_cidreq();
            $params = [
                'questionId' => $questionId,
                'attemptList' => $attemptList,
                'remindList' => $remindList,
                'i' => $i,
                'current_question' => $current_question,
                'questions_in_media' => $questions_in_media,
                'last_question_in_media' => $last_question_in_media,
            ];
            $params = json_encode($params);

            $script = '<script>
            $(function(){
                var params = '.$params.';
                $.ajax({
                    type: "GET",
                    data: params,
                    url: "'.$url.'",
                    success: function(return_value) {
                        $("#ajaxquestiondiv'.$questionId.'").html(return_value);
                    }
                });
            });
            </script>
            <div id="ajaxquestiondiv'.$questionId.'"></div>';
            echo $script;
        } else {
            global $origin;
            $question_obj = Question::read($questionId);
            $user_choice = isset($attemptList[$questionId]) ? $attemptList[$questionId] : null;
            $remind_highlight = null;

            // Hides questions when reviewing a ALL_ON_ONE_PAGE exercise
            // see #4542 no_remind_highlight class hide with jquery
            if ($this->type == ALL_ON_ONE_PAGE && isset($_GET['reminder']) && $_GET['reminder'] == 2) {
                $remind_highlight = 'no_remind_highlight';
                if (in_array($question_obj->type, Question::question_type_no_review())) {
                    return null;
                }
            }

            $attributes = ['id' => 'remind_list['.$questionId.']', 'data-question-id' => $questionId];

            // Showing the question
            $exercise_actions = null;
            echo '<a id="questionanchor'.$questionId.'"></a><br />';
            echo '<div id="question_div_'.$questionId.'" class="main_question '.$remind_highlight.'" >';

            // Shows the question + possible answers
            $showTitle = $this->getHideQuestionTitle() == 1 ? false : true;
            echo ExerciseLib::showQuestion(
                $this,
                $question_obj,
                false,
                $origin,
                $i,
                $showTitle,
                false,
                $user_choice
            );

            // Button save and continue
            switch ($this->type) {
                case ONE_PER_PAGE:
                    $exercise_actions .= $this->show_button(
                        $questionId,
                        $current_question,
                        null,
                        $remindList
                    );
                    break;
                case ALL_ON_ONE_PAGE:
                    if (api_is_allowed_to_session_edit()) {
                        $button = [
                            Display::button(
                                'save_now',
                                get_lang('SaveForNow'),
                                ['type' => 'button', 'class' => 'btn btn-primary', 'data-question' => $questionId]
                            ),
                            '<span id="save_for_now_'.$questionId.'" class="exercise_save_mini_message"></span>',
                        ];
                        $exercise_actions .= Display::div(
                            implode(PHP_EOL, $button),
                            ['class' => 'exercise_save_now_button']
                        );
                    }
                    break;
            }

            if (!empty($questions_in_media)) {
                $count_of_questions_inside_media = count($questions_in_media);
                if ($count_of_questions_inside_media > 1 && api_is_allowed_to_session_edit()) {
                    $button = [
                        Display::button(
                            'save_now',
                            get_lang('SaveForNow'),
                            ['type' => 'button', 'class' => 'btn btn-primary', 'data-question' => $questionId]
                        ),
                        '<span id="save_for_now_'.$questionId.'" class="exercise_save_mini_message"></span>&nbsp;',
                    ];
                    $exercise_actions = Display::div(
                        implode(PHP_EOL, $button),
                        ['class' => 'exercise_save_now_button']
                    );
                }

                if ($last_question_in_media && $this->type == ONE_PER_PAGE) {
                    $exercise_actions = $this->show_button($questionId, $current_question, $questions_in_media);
                }
            }

            // Checkbox review answers
            if ($this->review_answers &&
                !in_array($question_obj->type, Question::question_type_no_review())
            ) {
                $remind_question_div = Display::tag(
                    'label',
                    Display::input(
                        'checkbox',
                        'remind_list['.$questionId.']',
                        '',
                        $attributes
                    ).get_lang('ReviewQuestionLater'),
                    [
                        'class' => 'checkbox',
                        'for' => 'remind_list['.$questionId.']',
                    ]
                );
                $exercise_actions .= Display::div(
                    $remind_question_div,
                    ['class' => 'exercise_save_now_button']
                );
            }

            echo Display::div(' ', ['class' => 'clear']);

            $paginationCounter = null;
            if ($this->type == ONE_PER_PAGE) {
                if (empty($questions_in_media)) {
                    $paginationCounter = Display::paginationIndicator(
                        $current_question,
                        count($realQuestionList)
                    );
                } else {
                    if ($last_question_in_media) {
                        $paginationCounter = Display::paginationIndicator(
                            $current_question,
                            count($realQuestionList)
                        );
                    }
                }
            }

            echo '<div class="row"><div class="pull-right">'.$paginationCounter.'</div></div>';
            echo Display::div($exercise_actions, ['class' => 'form-actions']);
            echo '</div>';
        }
    }

    /**
     * Returns an array of categories details for the questions of the current
     * exercise.
     *
     * @return array
     */
    public function getQuestionWithCategories()
    {
        $categoryTable = Database::get_course_table(TABLE_QUIZ_QUESTION_CATEGORY);
        $categoryRelTable = Database::get_course_table(TABLE_QUIZ_QUESTION_REL_CATEGORY);
        $TBL_EXERCICE_QUESTION = Database::get_course_table(TABLE_QUIZ_TEST_QUESTION);
        $TBL_QUESTIONS = Database::get_course_table(TABLE_QUIZ_QUESTION);
        $sql = "SELECT DISTINCT cat.*
                FROM $TBL_EXERCICE_QUESTION e
                INNER JOIN $TBL_QUESTIONS q
                ON e.question_id = q.iid
                INNER JOIN $categoryRelTable catRel
                ON (catRel.question_id = e.question_id AND catRel.c_id = e.c_id)
                INNER JOIN $categoryTable cat
                ON (cat.iid = catRel.category_id)
                WHERE
                  e.c_id = {$this->course_id} AND
                  e.exercice_id	= ".intval($this->iid);

        $result = Database::query($sql);
        $categoriesInExercise = [];
        if (Database::num_rows($result)) {
            $categoriesInExercise = Database::store_result($result, 'ASSOC');
        }

        return $categoriesInExercise;
    }

    /**
     * Calculate the max_score of the quiz, depending of question inside, and quiz advanced option.
     */
    public function get_max_score()
    {
        $outMaxScore = 0;
        // list of question's id !!! the array key start at 1 !!!
        $questionList = $this->selectQuestionList(true);

        if ($this->random > 0 && $this->randomByCat > 0) {
            // test is random by category
            // get the $numberRandomQuestions best score question of each category
            $numberRandomQuestions = $this->random;
            $tab_categories_scores = [];
            foreach ($questionList as $questionId) {
                $question_category_id = TestCategory::getCategoryForQuestion($questionId);
                if (!is_array($tab_categories_scores[$question_category_id])) {
                    $tab_categories_scores[$question_category_id] = [];
                }
                $tmpobj_question = Question::read($questionId);
                if (is_object($tmpobj_question)) {
                    $tab_categories_scores[$question_category_id][] = $tmpobj_question->weighting;
                }
            }

            // here we've got an array with first key, the category_id, second key, score of question for this cat
            foreach ($tab_categories_scores as $tab_scores) {
                rsort($tab_scores);
                for ($i = 0; $i < min($numberRandomQuestions, count($tab_scores)); $i++) {
                    $outMaxScore += $tab_scores[$i];
                }
            }
        } else {
            // standard test, just add each question score
            foreach ($questionList as $questionId) {
                $question = Question::read($questionId, $this->course);
                $outMaxScore += $question->weighting;
            }
        }

        return $outMaxScore;
    }

    /**
     * @return string
     */
    public function get_formated_title()
    {
        if (api_get_configuration_value('save_titles_as_html')) {
        }

        return api_html_entity_decode($this->selectTitle());
    }

    /**
     * @param string $title
     *
     * @return string
     */
    public static function get_formated_title_variable($title)
    {
        return api_html_entity_decode($title);
    }

    /**
     * @return string
     */
    public function format_title()
    {
        return api_htmlentities($this->title);
    }

    /**
     * @param string $title
     *
     * @return string
     */
    public static function format_title_variable($title)
    {
        return api_htmlentities($title);
    }

    /**
     * @param int $courseId
     * @param int $sessionId
     *
     * @return array exercises
     */
    public function getExercisesByCourseSession($courseId, $sessionId)
    {
        $courseId = (int) $courseId;
        $sessionId = (int) $sessionId;

        $tbl_quiz = Database::get_course_table(TABLE_QUIZ_TEST);
        $sql = "SELECT * FROM $tbl_quiz cq
                WHERE
                    cq.c_id = %s AND
                    (cq.session_id = %s OR cq.session_id = 0) AND
                    cq.active = 0
                ORDER BY cq.iid";
        $sql = sprintf($sql, $courseId, $sessionId);

        $result = Database::query($sql);

        $rows = [];
        while ($row = Database::fetch_array($result, 'ASSOC')) {
            $rows[] = $row;
        }

        return $rows;
    }

    /**
     * Get array of exercise details and user results.
     *
     * @param int   $courseId
     * @param int   $sessionId
     * @param array $quizId
     * @param bool  $checkOnlyActiveUsers
     * @param array $filterDates          Limit the results exported to those within this range ('start_date' to 'end_date')
     *
     * @return array exercises
     */
    public function getExerciseAndResult($courseId, $sessionId, $quizId = [], $checkOnlyActiveUsers = false, $filterDates = [])
    {
        if (empty($quizId)) {
            return [];
        }

        $sessionId = (int) $sessionId;
        $courseId = (int) $courseId;

        $ids = is_array($quizId) ? $quizId : [$quizId];
        $ids = array_map('intval', $ids);
        $ids = implode(',', $ids);
        $trackExcercises = Database::get_main_table(TABLE_STATISTIC_TRACK_E_EXERCISES);
        $tblQuiz = Database::get_course_table(TABLE_QUIZ_TEST);
        $tblUser = Database::get_main_table(TABLE_MAIN_USER);

        $condition = '';
        $innerJoinUser = '';
        if ($checkOnlyActiveUsers) {
            $condition .= " AND te.status = '' ";
            $innerJoinUser .= " INNER JOIN $tblUser u ON u.user_id = te. exe_user_id";
        }

        if (!empty($filterDates)) {
            if (!empty($filterDates['start_date'])) {
                $condition .= " AND te.exe_date >= '".Database::escape_string($filterDates['start_date'])."' ";
            }
            if (!empty($filterDates['end_date'])) {
                $condition .= " AND te.exe_date <= '".Database::escape_string($filterDates['end_date'])."' ";
            }
        }

        if (0 != $sessionId) {
            $sql = "SELECT * FROM $trackExcercises te
                    INNER JOIN $tblQuiz cq ON cq.iid = te.exe_exo_id
                    $innerJoinUser
                    WHERE
                    te.c_id = %s AND
                    te.session_id = %s AND
                    cq.iid IN (%s)
                    $condition
              ORDER BY cq.iid";

            $sql = sprintf($sql, $courseId, $sessionId, $ids);
        } else {
            $sql = "SELECT * FROM $trackExcercises te
                INNER JOIN $tblQuiz cq ON cq.iid = te.exe_exo_id
                $innerJoinUser
                WHERE
                te.c_id = %s AND
                cq.iid IN (%s)
                $condition
              ORDER BY cq.iid";
            $sql = sprintf($sql, $courseId, $ids);
        }
        $result = Database::query($sql);
        $rows = [];
        while ($row = Database::fetch_array($result, 'ASSOC')) {
            $rows[] = $row;
        }

        return $rows;
    }

    /**
     * @param $exeId
     * @param $exercise_stat_info
     * @param $remindList
     * @param $currentQuestion
     *
     * @return int|null
     */
    public static function getNextQuestionId(
        $exeId,
        $exercise_stat_info,
        $remindList,
        $currentQuestion
    ) {
        $result = Event::get_exercise_results_by_attempt($exeId, 'incomplete');

        if (isset($result[$exeId])) {
            $result = $result[$exeId];
        } else {
            return null;
        }

        $data_tracking = $exercise_stat_info['data_tracking'];
        $data_tracking = explode(',', $data_tracking);

        // if this is the final question do nothing.
        if ($currentQuestion == count($data_tracking)) {
            return null;
        }

        $currentQuestion--;

        if (!empty($result['question_list'])) {
            $answeredQuestions = [];
            foreach ($result['question_list'] as $question) {
                if (!empty($question['answer'])) {
                    $answeredQuestions[] = $question['question_id'];
                }
            }

            // Checking answered questions
            $counterAnsweredQuestions = 0;
            foreach ($data_tracking as $questionId) {
                if (!in_array($questionId, $answeredQuestions)) {
                    if ($currentQuestion != $counterAnsweredQuestions) {
                        break;
                    }
                }
                $counterAnsweredQuestions++;
            }

            $counterRemindListQuestions = 0;
            // Checking questions saved in the reminder list
            if (!empty($remindList)) {
                foreach ($data_tracking as $questionId) {
                    if (in_array($questionId, $remindList)) {
                        // Skip the current question
                        if ($currentQuestion != $counterRemindListQuestions) {
                            break;
                        }
                    }
                    $counterRemindListQuestions++;
                }

                if ($counterRemindListQuestions < $currentQuestion) {
                    return null;
                }

                if (!empty($counterRemindListQuestions)) {
                    if ($counterRemindListQuestions > $counterAnsweredQuestions) {
                        return $counterAnsweredQuestions;
                    } else {
                        return $counterRemindListQuestions;
                    }
                }
            }

            return $counterAnsweredQuestions;
        }
    }

    /**
     * Gets the position of a questionId in the question list.
     *
     * @param $questionId
     *
     * @return int
     */
    public function getPositionInCompressedQuestionList($questionId)
    {
        $questionList = $this->getQuestionListWithMediasCompressed();
        $mediaQuestions = $this->getMediaList();
        $position = 1;
        foreach ($questionList as $id) {
            if (isset($mediaQuestions[$id]) && in_array($questionId, $mediaQuestions[$id])) {
                $mediaQuestionList = $mediaQuestions[$id];
                if (in_array($questionId, $mediaQuestionList)) {
                    return $position;
                } else {
                    $position++;
                }
            } else {
                if ($id == $questionId) {
                    return $position;
                } else {
                    $position++;
                }
            }
        }

        return 1;
    }

    /**
     * Get the correct answers in all attempts.
     *
     * @param int  $learnPathId
     * @param int  $learnPathItemId
     * @param bool $onlyCorrect
     *
     * @return array
     */
    public function getAnswersInAllAttempts($learnPathId = 0, $learnPathItemId = 0, $onlyCorrect = true)
    {
        $attempts = Event::getExerciseResultsByUser(
            api_get_user_id(),
            $this->iid,
            api_get_course_int_id(),
            api_get_session_id(),
            $learnPathId,
            $learnPathItemId,
            'DESC'
        );

        $list = [];
        foreach ($attempts as $attempt) {
            foreach ($attempt['question_list'] as $answers) {
                foreach ($answers as $answer) {
                    $objAnswer = new Answer($answer['question_id']);
                    if ($onlyCorrect) {
                        switch ($objAnswer->getQuestionType()) {
                            case FILL_IN_BLANKS:
                            case FILL_IN_BLANKS_COMBINATION:
                                $isCorrect = FillBlanks::isCorrect($answer['answer']);
                                break;
                            case MATCHING:
                            case MATCHING_COMBINATION:
                            case DRAGGABLE:
                            case MATCHING_DRAGGABLE_COMBINATION:
                            case MATCHING_DRAGGABLE:
                                $isCorrect = Matching::isCorrect(
                                    $answer['position'],
                                    $answer['answer'],
                                    $answer['question_id']
                                );
                                break;
                            case ORAL_EXPRESSION:
                                $isCorrect = false;
                                break;
                            default:
                                $isCorrect = $objAnswer->isCorrectByAutoId($answer['answer']);
                        }
                        if ($isCorrect) {
                            $list[$answer['question_id']][] = $answer;
                        }
                    } else {
                        $list[$answer['question_id']][] = $answer;
                    }
                }
            }

            if (false === $onlyCorrect) {
                // Only take latest attempt
                break;
            }
        }

        return $list;
    }

    /**
     * Get the correct answers in all attempts.
     *
     * @param int $learnPathId
     * @param int $learnPathItemId
     *
     * @return array
     */
    public function getCorrectAnswersInAllAttempts($learnPathId = 0, $learnPathItemId = 0)
    {
        return $this->getAnswersInAllAttempts($learnPathId, $learnPathItemId);
    }

    /**
     * @return bool
     */
    public function showPreviousButton()
    {
        $allow = api_get_configuration_value('allow_quiz_show_previous_button_setting');
        if (false === $allow) {
            return true;
        }

        return $this->showPreviousButton;
    }

    public function getPreventBackwards()
    {
        $allow = api_get_configuration_value('quiz_prevent_backwards_move');
        if (false === $allow) {
            return 0;
        }

        return (int) $this->preventBackwards;
    }

    /**
     * @return int
     */
    public function getExerciseCategoryId()
    {
        if (empty($this->exerciseCategoryId)) {
            return null;
        }

        return (int) $this->exerciseCategoryId;
    }

    /**
     * @param int $value
     */
    public function setExerciseCategoryId($value)
    {
        if (!empty($value)) {
            $this->exerciseCategoryId = (int) $value;
        }
    }

    /**
     * Set the value to 1 to hide the question number.
     *
     * @param int $value
     */
    public function setHideQuestionNumber($value = 0)
    {
        $showHideConfiguration = api_get_configuration_value('quiz_hide_question_number');
        if ($showHideConfiguration) {
            $this->hideQuestionNumber = (int) $value;
        }
    }

    /**
     * Gets the value to hide or show the question number. If it does not exist, it is set to 0.
     *
     * @return int 1 if the question number must be hidden
     */
    public function getHideQuestionNumber()
    {
        $showHideConfiguration = api_get_configuration_value('quiz_hide_question_number');
        if ($showHideConfiguration) {
            return (int) $this->hideQuestionNumber;
        }

        return 0;
    }

    /**
     * Set the value to 1 to hide the attempts table on start page.
     *
     * @param int $value
     */
    public function setHideAttemptsTableOnStartPage($value = 0)
    {
        $showHideAttemptsTableOnStartPage = api_get_configuration_value('quiz_hide_attempts_table_on_start_page');
        if ($showHideAttemptsTableOnStartPage) {
            $this->hideAttemptsTableOnStartPage = (int) $value;
        }
    }

    /**
     * Gets the value to hide or show the attempts table on start page. If it does not exist, it is set to 0.
     *
     * @return int 1 if the attempts table must be hidden
     */
    public function getHideAttemptsTableOnStartPage()
    {
        $showHideAttemptsTableOnStartPage = api_get_configuration_value('quiz_hide_attempts_table_on_start_page');
        if ($showHideAttemptsTableOnStartPage) {
            return (int) $this->hideAttemptsTableOnStartPage;
        }

        return 0;
    }

    /**
     * @param array $values
     */
    public function setPageResultConfiguration($values)
    {
        $pageConfig = api_get_configuration_value('allow_quiz_results_page_config');
        if ($pageConfig) {
            $params = [
                'hide_expected_answer' => $values['hide_expected_answer'] ?? '',
                'hide_question_score' => $values['hide_question_score'] ?? '',
                'hide_total_score' => $values['hide_total_score'] ?? '',
                'hide_category_table' => $values['hide_category_table'] ?? '',
                'hide_correct_answered_questions' => $values['hide_correct_answered_questions'] ?? '',
                'hide_comment' => $values['hide_comment'] ?? '',
            ];
            $type = Type::getType('array');
            $platform = Database::getManager()->getConnection()->getDatabasePlatform();
            $this->pageResultConfiguration = $type->convertToDatabaseValue($params, $platform);
        }
    }

    /**
     * @param array $defaults
     */
    public function setPageResultConfigurationDefaults(&$defaults)
    {
        $configuration = $this->getPageResultConfiguration();
        if (!empty($configuration) && !empty($defaults)) {
            $defaults = array_merge($defaults, $configuration);
        }
    }

    /**
     * Sets the value to show or hide the question number in the default settings of the forms.
     *
     * @param array $defaults
     */
    public function setHideQuestionNumberDefaults(&$defaults)
    {
        $configuration = $this->getHideQuestionNumberConfiguration();
        if (!empty($configuration) && !empty($defaults)) {
            $defaults = array_merge($defaults, $configuration);
        }
    }

    /**
     * Sets the value to show or hide the attempts table on start page in the default settings of the forms.
     *
     * @param array $defaults
     */
    public function setHideAttemptsTableOnStartPageDefaults(&$defaults)
    {
        $configuration = $this->getHideAttemptsTableOnStartPageConfiguration();
        if (!empty($configuration) && !empty($defaults)) {
            $defaults = array_merge($defaults, $configuration);
        }
    }

    /**
     * @return array
     */
    public function getPageResultConfiguration()
    {
        $pageConfig = api_get_configuration_value('allow_quiz_results_page_config');
        if ($pageConfig) {
            $type = Type::getType('array');
            $platform = Database::getManager()->getConnection()->getDatabasePlatform();

            return $type->convertToPHPValue($this->pageResultConfiguration, $platform);
        }

        return [];
    }

    /**
     * Get the value to show or hide the question number in the default settings of the forms.
     *
     * @return array
     */
    public function getHideQuestionNumberConfiguration()
    {
        $pageConfig = api_get_configuration_value('quiz_hide_question_number');
        if ($pageConfig) {
            return ['hide_question_number' => $this->hideQuestionNumber];
        }

        return [];
    }

    /**
     * Get the value to show or hide the attempts table on start page in the default settings of the forms.
     *
     * @return array
     */
    public function getHideAttemptsTableOnStartPageConfiguration()
    {
        $pageConfig = api_get_configuration_value('quiz_hide_attempts_table_on_start_page');
        if ($pageConfig) {
            return ['hide_attempts_table' => $this->hideAttemptsTableOnStartPage];
        }

        return [];
    }

    /**
     * @param string $attribute
     *
     * @return mixed|null
     */
    public function getPageConfigurationAttribute($attribute)
    {
        $result = $this->getPageResultConfiguration();

        if (!empty($result)) {
            return isset($result[$attribute]) ? $result[$attribute] : null;
        }

        return null;
    }

    /**
     * @param bool $showPreviousButton
     *
     * @return Exercise
     */
    public function setShowPreviousButton($showPreviousButton)
    {
        $this->showPreviousButton = $showPreviousButton;

        return $this;
    }

    /**
     * @param array $notifications
     */
    public function setNotifications($notifications)
    {
        $this->notifications = $notifications;
    }

    /**
     * @return array
     */
    public function getNotifications()
    {
        return $this->notifications;
    }

    /**
     * @return bool
     */
    public function showExpectedChoice()
    {
        return api_get_configuration_value('show_exercise_expected_choice');
    }

    /**
     * @return bool
     */
    public function showExpectedChoiceColumn()
    {
        if (true === $this->forceShowExpectedChoiceColumn) {
            return true;
        }

        if ($this->hideExpectedAnswer) {
            return false;
        }

        if (!in_array($this->results_disabled, [
            RESULT_DISABLE_SHOW_ONLY_IN_CORRECT_ANSWER,
        ])
        ) {
            $hide = (int) $this->getPageConfigurationAttribute('hide_expected_answer');
            if (1 === $hide) {
                return false;
            }

            return true;
        }

        return false;
    }

    /**
     * @param string $class
     * @param string $scoreLabel
     * @param string $result
     * @param array
     *
     * @return string
     */
    public function getQuestionRibbon($class, $scoreLabel, $result, $array)
    {
        $hide = (int) $this->getPageConfigurationAttribute('hide_question_score');
        if (1 === $hide) {
            return '';
        }

        if ($this->showExpectedChoice()) {
            $html = null;
            $hideLabel = api_get_configuration_value('exercise_hide_label');
            $label = '<div class="rib rib-'.$class.'">
                        <h3>'.$scoreLabel.'</h3>
                      </div>';
            if (!empty($result)) {
                $label .= '<h4>'.get_lang('Score').': '.$result.'</h4>';
            }
            if (true === $hideLabel) {
                $answerUsed = (int) $array['used'];
                $answerMissing = (int) $array['missing'] - $answerUsed;
                for ($i = 1; $i <= $answerUsed; $i++) {
                    $html .= '<span class="score-img">'.
                        Display::return_icon('attempt-check.png', null, null, ICON_SIZE_SMALL).
                        '</span>';
                }
                for ($i = 1; $i <= $answerMissing; $i++) {
                    $html .= '<span class="score-img">'.
                        Display::return_icon('attempt-nocheck.png', null, null, ICON_SIZE_SMALL).
                        '</span>';
                }
                $label = '<div class="score-title">'.get_lang('CorrectAnswers').': '.$result.'</div>';
                $label .= '<div class="score-limits">';
                $label .= $html;
                $label .= '</div>';
            }

            return '<div class="ribbon">
                '.$label.'
                </div>'
                ;
        } else {
            $html = '<div class="ribbon">
                        <div class="rib rib-'.$class.'">
                            <h3>'.$scoreLabel.'</h3>
                        </div>';
            if (!empty($result)) {
                $html .= '<h4>'.get_lang('Score').': '.$result.'</h4>';
            }
            $html .= '</div>';

            return $html;
        }
    }

    /**
     * @return int
     */
    public function getAutoLaunch()
    {
        return $this->autolaunch;
    }

    /**
     * Clean auto launch settings for all exercise in course/course-session.
     */
    public function enableAutoLaunch()
    {
        $table = Database::get_course_table(TABLE_QUIZ_TEST);
        $sql = "UPDATE $table SET autolaunch = 1
                WHERE iid = ".$this->iid;
        Database::query($sql);
    }

    /**
     * Clean auto launch settings for all exercise in course/course-session.
     */
    public function cleanCourseLaunchSettings()
    {
        $table = Database::get_course_table(TABLE_QUIZ_TEST);
        $sql = "UPDATE $table SET autolaunch = 0
                WHERE c_id = ".$this->course_id." AND session_id = ".$this->sessionId;
        Database::query($sql);
    }

    /**
     * Get the title without HTML tags.
     *
     * @return string
     */
    public function getUnformattedTitle()
    {
        return strip_tags(api_html_entity_decode($this->title));
    }

    /**
     * Get the question IDs from quiz_rel_question for the current quiz,
     * using the parameters as the arguments to the SQL's LIMIT clause.
     * Because the exercise_id is known, it also comes with a filter on
     * the session, so sessions are not specified here.
     *
     * @param int $start  At which question do we want to start the list
     * @param int $length Up to how many results we want
     *
     * @return array A list of question IDs
     */
    public function getQuestionForTeacher($start = 0, $length = 10)
    {
        $start = (int) $start;
        if ($start < 0) {
            $start = 0;
        }

        $length = (int) $length;

        $quizRelQuestion = Database::get_course_table(TABLE_QUIZ_TEST_QUESTION);
        $question = Database::get_course_table(TABLE_QUIZ_QUESTION);
        $sql = "SELECT DISTINCT e.question_id
                FROM $quizRelQuestion e
                INNER JOIN $question q
                ON e.question_id = q.iid
                WHERE
                    e.c_id = {$this->course_id} AND
                    e.exercice_id = {$this->iid}
                ORDER BY question_order
                LIMIT $start, $length
            ";
        $result = Database::query($sql);
        $questionList = [];
        while ($object = Database::fetch_object($result)) {
            $questionList[] = $object->question_id;
        }

        return $questionList;
    }

    /**
     * @param int   $exerciseId
     * @param array $courseInfo
     * @param int   $sessionId
     *
     * @return bool
     */
    public function generateStats($exerciseId, $courseInfo, $sessionId)
    {
        $allowStats = api_get_configuration_value('allow_gradebook_stats');
        if (!$allowStats) {
            return false;
        }

        if (empty($courseInfo)) {
            return false;
        }

        $courseId = $courseInfo['real_id'];

        $sessionId = (int) $sessionId;
        $exerciseId = (int) $exerciseId;

        $result = $this->read($exerciseId);

        if (empty($result)) {
            api_not_allowed(true);
        }

        $statusToFilter = empty($sessionId) ? STUDENT : 0;

        $studentList = CourseManager::get_user_list_from_course_code(
            $courseInfo['code'],
            $sessionId,
            null,
            null,
            $statusToFilter
        );

        if (empty($studentList)) {
            Display::addFlash(Display::return_message(get_lang('NoUsersInCourse')));
            header('Location: '.api_get_path(WEB_CODE_PATH).'exercise/exercise.php?'.api_get_cidreq());
            exit;
        }

        $tblStats = Database::get_main_table(TABLE_STATISTIC_TRACK_E_EXERCISES);

        $studentIdList = [];
        if (!empty($studentList)) {
            $studentIdList = array_column($studentList, 'user_id');
        }

        if (false == $this->exercise_was_added_in_lp) {
            $sql = "SELECT * FROM $tblStats
                        WHERE
                            exe_exo_id = $exerciseId AND
                            orig_lp_id = 0 AND
                            orig_lp_item_id = 0 AND
                            status <> 'incomplete' AND
                            session_id = $sessionId AND
                            c_id = $courseId
                        ";
        } else {
            $lpId = null;
            if (!empty($this->lpList)) {
                // Taking only the first LP
                $lpId = $this->getLpBySession($sessionId);
                $lpId = $lpId['lp_id'];
            }

            $sql = "SELECT *
                        FROM $tblStats
                        WHERE
                            exe_exo_id = $exerciseId AND
                            orig_lp_id = $lpId AND
                            status <> 'incomplete' AND
                            session_id = $sessionId AND
                            c_id = $courseId ";
        }

        $sql .= ' ORDER BY exe_id DESC';

        $studentCount = 0;
        $sum = 0;
        $bestResult = 0;
        $sumResult = 0;
        $result = Database::query($sql);
        $students = [];
        while ($data = Database::fetch_array($result, 'ASSOC')) {
            // Only take into account users in the current student list.
            if (!empty($studentIdList)) {
                if (!in_array($data['exe_user_id'], $studentIdList)) {
                    continue;
                }
            }

            if (!isset($students[$data['exe_user_id']])) {
                if ($data['exe_weighting'] != 0) {
                    $students[$data['exe_user_id']] = $data['exe_result'];
                    if ($data['exe_result'] > $bestResult) {
                        $bestResult = $data['exe_result'];
                    }
                    $sumResult += $data['exe_result'];
                }
            }
        }

        $count = count($studentList);
        $average = $sumResult / $count;
        $em = Database::getManager();

        $links = AbstractLink::getGradebookLinksFromItem(
            $this->iid,
            LINK_EXERCISE,
            $courseInfo['code'],
            $sessionId
        );

        if (empty($links)) {
            $links = AbstractLink::getGradebookLinksFromItem(
                $this->iid,
                LINK_EXERCISE,
                $courseInfo['code'],
                $sessionId
            );
        }

        if (!empty($links)) {
            $repo = $em->getRepository('ChamiloCoreBundle:GradebookLink');

            foreach ($links as $link) {
                $linkId = $link['id'];
                /** @var GradebookLink $exerciseLink */
                $exerciseLink = $repo->find($linkId);
                if ($exerciseLink) {
                    $exerciseLink
                        ->setUserScoreList($students)
                        ->setBestScore($bestResult)
                        ->setAverageScore($average)
                        ->setScoreWeight($this->get_max_score());
                    $em->persist($exerciseLink);
                    $em->flush();
                }
            }
        }
    }

    /**
     * Return an HTML table of exercises for on-screen printing, including
     * action icons. If no exercise is present and the user can edit the
     * course, show a "create test" button.
     *
     * @param int    $categoryId
     * @param string $keyword
     * @param int    $userId
     * @param int    $courseId
     * @param int    $sessionId
     * @param bool   $returnData
     * @param int    $minCategoriesInExercise
     * @param int    $filterByResultDisabled
     * @param int    $filterByAttempt
     *
     * @return string|SortableTableFromArrayConfig
     */
    public static function exerciseGrid(
        $categoryId,
        $keyword = '',
        $userId = 0,
        $courseId = 0,
        $sessionId = 0,
        $returnData = false,
        $minCategoriesInExercise = 0,
        $filterByResultDisabled = 0,
        $filterByAttempt = 0,
        $myActions = null,
        $returnTable = false,
        $isAllowedToEdit = null
    ) {
        //$allowDelete = Exercise::allowAction('delete');
        $allowClean = self::allowAction('clean_results');

        $TBL_DOCUMENT = Database::get_course_table(TABLE_DOCUMENT);
        $TBL_ITEM_PROPERTY = Database::get_course_table(TABLE_ITEM_PROPERTY);
        $TBL_EXERCISE_QUESTION = Database::get_course_table(TABLE_QUIZ_TEST_QUESTION);
        $TBL_EXERCISES = Database::get_course_table(TABLE_QUIZ_TEST);
        $TBL_TRACK_EXERCISES = Database::get_main_table(TABLE_STATISTIC_TRACK_E_EXERCISES);

        $categoryId = (int) $categoryId;
        $keyword = Database::escape_string($keyword);
        $learnpath_id = isset($_REQUEST['learnpath_id']) ? (int) $_REQUEST['learnpath_id'] : null;
        $learnpath_item_id = isset($_REQUEST['learnpath_item_id']) ? (int) $_REQUEST['learnpath_item_id'] : null;

        $autoLaunchAvailable = false;
        if (api_get_course_setting('enable_exercise_auto_launch') == 1 &&
            api_get_configuration_value('allow_exercise_auto_launch')
        ) {
            $autoLaunchAvailable = true;
        }

        if (!isset($isAllowedToEdit)) {
            $isAllowedToEdit = api_is_allowed_to_edit(null, true);
        }
        $courseInfo = $courseId ? api_get_course_info_by_id($courseId) : api_get_course_info();
        $sessionId = $sessionId ? (int) $sessionId : api_get_session_id();
        $courseId = $courseInfo['real_id'];
        $tableRows = [];
        $uploadPath = DIR_HOTPOTATOES; //defined in main_api
        $exercisePath = api_get_self();
        $origin = api_get_origin();
        $userInfo = $userId ? api_get_user_info($userId) : api_get_user_info();
        $charset = 'utf-8';
        $token = Security::get_token();
        $userId = $userId ? (int) $userId : api_get_user_id();
        $isDrhOfCourse = CourseManager::isUserSubscribedInCourseAsDrh($userId, $courseInfo);
        $documentPath = api_get_path(SYS_COURSE_PATH).$courseInfo['path'].'/document';
        $limitTeacherAccess = api_get_configuration_value('limit_exercise_teacher_access');

        // Condition for the session
        $condition_session = api_get_session_condition($sessionId, true, true, 'e.session_id');
        $content = '';
        $column = 0;
        if ($isAllowedToEdit) {
            $column = 1;
        }

        $table = new SortableTableFromArrayConfig(
            [],
            $column,
            self::PAGINATION_ITEMS_PER_PAGE,
            'exercises_cat_'.$categoryId
        );

        $limit = $table->per_page;
        $page = $table->page_nr;
        $from = $limit * ($page - 1);

        $categoryCondition = '';
        if (api_get_configuration_value('allow_exercise_categories')) {
            if (!empty($categoryId)) {
                $categoryCondition = " AND exercise_category_id = $categoryId ";
            } else {
                $categoryCondition = ' AND exercise_category_id IS NULL ';
            }
        }

        $keywordCondition = '';
        if (!empty($keyword)) {
            $keywordCondition = " AND title LIKE '%$keyword%' ";
        }

        $filterByResultDisabledCondition = '';
        $filterByResultDisabled = (int) $filterByResultDisabled;
        if (!empty($filterByResultDisabled)) {
            $filterByResultDisabledCondition = ' AND e.results_disabled = '.$filterByResultDisabled;
        }
        $filterByAttemptCondition = '';
        $filterByAttempt = (int) $filterByAttempt;
        if (!empty($filterByAttempt)) {
            $filterByAttemptCondition = ' AND e.max_attempt = '.$filterByAttempt;
        }

        // Only for administrators
        if ($isAllowedToEdit) {
            $total_sql = "SELECT count(iid) as count
                          FROM $TBL_EXERCISES e
                          WHERE
                                c_id = $courseId AND
                                active <> -1
                                $condition_session
                                $categoryCondition
                                $keywordCondition
                                $filterByResultDisabledCondition
                                $filterByAttemptCondition
                                ";
            $sql = "SELECT * FROM $TBL_EXERCISES e
                    WHERE
                        c_id = $courseId AND
                        active <> -1
                        $condition_session
                        $categoryCondition
                        $keywordCondition
                        $filterByResultDisabledCondition
                        $filterByAttemptCondition
                    ORDER BY title
                    LIMIT $from , $limit";
        } else {
            // Only for students
            if (empty($sessionId)) {
                $condition_session = ' AND ( session_id = 0 OR session_id IS NULL) ';
                $total_sql = "SELECT count(DISTINCT(e.iid)) as count
                              FROM $TBL_EXERCISES e
                              WHERE
                                    e.c_id = $courseId AND
                                    e.active = 1
                                    $condition_session
                                    $categoryCondition
                                    $keywordCondition
                              ";

                $sql = "SELECT DISTINCT e.* FROM $TBL_EXERCISES e
                        WHERE
                             e.c_id = $courseId AND
                             e.active = 1
                             $condition_session
                             $categoryCondition
                             $keywordCondition
                        ORDER BY title
                        LIMIT $from , $limit";
            } else {
                $invisibleSql = "SELECT e.iid
                                  FROM $TBL_EXERCISES e
                                  INNER JOIN $TBL_ITEM_PROPERTY ip
                                  ON (e.iid = ip.ref AND e.c_id = ip.c_id)
                                  WHERE
                                        ip.tool = '".TOOL_QUIZ."' AND
                                        e.c_id = $courseId AND
                                        e.active = 1 AND
                                        ip.visibility = 0 AND
                                        ip.session_id = $sessionId
                                        $categoryCondition
                                        $keywordCondition
                                  ";

                $result = Database::query($invisibleSql);
                $result = Database::store_result($result);
                $hiddenFromSessionCondition = ' 1=1 ';
                if (!empty($result)) {
                    $hiddenFromSession = implode("','", array_column($result, 'iid'));
                    $hiddenFromSessionCondition = " e.iid not in ('$hiddenFromSession')";
                }

                $condition_session = " AND (
                        (e.session_id = $sessionId OR e.session_id = 0 OR e.session_id IS NULL) AND
                        $hiddenFromSessionCondition
                )
                ";

                // Only for students
                $total_sql = "SELECT count(DISTINCT(e.iid)) as count
                              FROM $TBL_EXERCISES e
                              WHERE
                                    e.c_id = $courseId AND
                                    e.active = 1
                                    $condition_session
                                    $categoryCondition
                                    $keywordCondition
                              ";
                $sql = "SELECT DISTINCT e.* FROM $TBL_EXERCISES e
                        WHERE
                             e.c_id = $courseId AND
                             e.active = 1
                             $condition_session
                             $categoryCondition
                             $keywordCondition
                        ORDER BY title
                        LIMIT $from , $limit";
            }
        }

        $result = Database::query($sql);
        $result_total = Database::query($total_sql);

        $total_exercises = 0;
        if (Database::num_rows($result_total)) {
            $result_total = Database::fetch_array($result_total);
            $total_exercises = $result_total['count'];
        }

        //get HotPotatoes files (active and inactive)
        if ($isAllowedToEdit) {
            $sql = "SELECT * FROM $TBL_DOCUMENT
                    WHERE
                        c_id = $courseId AND
                        path LIKE '".Database::escape_string($uploadPath.'/%/%')."'";
            $res = Database::query($sql);
            $hp_count = Database::num_rows($res);
        } else {
            $sql = "SELECT * FROM $TBL_DOCUMENT d
                    INNER JOIN $TBL_ITEM_PROPERTY ip
                    ON (d.iid = ip.ref)
                    WHERE
                        ip.tool = '".TOOL_DOCUMENT."' AND
                        d.path LIKE '".Database::escape_string($uploadPath.'/%/%')."' AND
                        ip.visibility = 1 AND
                        d.c_id = $courseId AND
                        ip.c_id  = $courseId";
            $res = Database::query($sql);
            $hp_count = Database::num_rows($res);
        }

        $total = $total_exercises + $hp_count;
        $exerciseList = [];
        while ($row = Database::fetch_array($result, 'ASSOC')) {
            $exerciseList[] = $row;
        }

        if (!empty($exerciseList) &&
            api_get_setting('exercise_invisible_in_session') === 'true'
        ) {
            if (!empty($sessionId)) {
                $changeDefaultVisibility = true;
                if (api_get_setting('configure_exercise_visibility_in_course') === 'true') {
                    $changeDefaultVisibility = false;
                    if (api_get_course_setting('exercise_invisible_in_session') == 1) {
                        $changeDefaultVisibility = true;
                    }
                }

                if ($changeDefaultVisibility) {
                    // Check exercise
                    foreach ($exerciseList as $exercise) {
                        if ($exercise['session_id'] == 0) {
                            $visibilityInfo = api_get_item_property_info(
                                $courseId,
                                TOOL_QUIZ,
                                $exercise['iid'],
                                $sessionId
                            );

                            if (empty($visibilityInfo)) {
                                // Create a record for this
                                api_item_property_update(
                                    $courseInfo,
                                    TOOL_QUIZ,
                                    $exercise['iid'],
                                    'invisible',
                                    api_get_user_id(),
                                    0,
                                    null,
                                    '',
                                    '',
                                    $sessionId
                                );
                            }
                        }
                    }
                }
            }
        }

        $webPath = api_get_path(WEB_CODE_PATH);
        if (!empty($exerciseList)) {
            if ($origin !== 'learnpath') {
                $visibilitySetting = api_get_configuration_value('show_hidden_exercise_added_to_lp');
                //avoid sending empty parameters
                $mylpid = empty($learnpath_id) ? '' : '&learnpath_id='.$learnpath_id;
                $mylpitemid = empty($learnpath_item_id) ? '' : '&learnpath_item_id='.$learnpath_item_id;
                foreach ($exerciseList as $row) {
                    $currentRow = [];
                    $my_exercise_id = $row['iid'];
                    $attempt_text = '';
                    $actions = '';
                    $exercise = new Exercise($returnData ? $courseId : 0);
                    $exercise->read($my_exercise_id, false);

                    if (empty($exercise->iid)) {
                        continue;
                    }

                    $locked = $exercise->is_gradebook_locked;
                    // Validation when belongs to a session
                    $session_img = api_get_session_image($row['session_id'], $userInfo['status']);

                    $time_limits = false;
                    if (!empty($row['start_time']) || !empty($row['end_time'])) {
                        $time_limits = true;
                    }

                    $is_actived_time = false;
                    if ($time_limits) {
                        // check if start time
                        $start_time = false;
                        if (!empty($row['start_time'])) {
                            $start_time = api_strtotime($row['start_time'], 'UTC');
                        }
                        $end_time = false;
                        if (!empty($row['end_time'])) {
                            $end_time = api_strtotime($row['end_time'], 'UTC');
                        }
                        $now = time();

                        //If both "clocks" are enable
                        if ($start_time && $end_time) {
                            if ($now > $start_time && $end_time > $now) {
                                $is_actived_time = true;
                            }
                        } else {
                            //we check the start and end
                            if ($start_time) {
                                if ($now > $start_time) {
                                    $is_actived_time = true;
                                }
                            }
                            if ($end_time) {
                                if ($end_time > $now) {
                                    $is_actived_time = true;
                                }
                            }
                        }
                    }

                    // Blocking empty start times see BT#2800
                    global $_custom;
                    if (isset($_custom['exercises_hidden_when_no_start_date']) &&
                        $_custom['exercises_hidden_when_no_start_date']
                    ) {
                        if (empty($row['start_time'])) {
                            $time_limits = true;
                            $is_actived_time = false;
                        }
                    }

                    $cut_title = $exercise->getCutTitle();
                    $alt_title = '';
                    if ($cut_title != $row['title']) {
                        $alt_title = ' title = "'.$exercise->getUnformattedTitle().'" ';
                    }

                    // Teacher only
                    if ($isAllowedToEdit) {
                        $lp_blocked = null;
                        if ($exercise->exercise_was_added_in_lp == true) {
                            $lp_blocked = Display::div(
                                get_lang('AddedToLPCannotBeAccessed'),
                                ['class' => 'lp_content_type_label']
                            );
                        }

                        // Get visibility in base course
                        $visibility = api_get_item_visibility(
                            $courseInfo,
                            TOOL_QUIZ,
                            $my_exercise_id,
                            0
                        );

                        if (!empty($sessionId)) {
                            // If we are in a session, the test is invisible
                            // in the base course, it is included in a LP
                            // *and* the setting to show it is *not*
                            // specifically set to true, then hide it.
                            if ($visibility == 0) {
                                if (!$visibilitySetting) {
                                    if ($exercise->exercise_was_added_in_lp == true) {
                                        continue;
                                    }
                                }
                            }

                            $visibility = api_get_item_visibility(
                                $courseInfo,
                                TOOL_QUIZ,
                                $my_exercise_id,
                                $sessionId
                            );
                        }

                        if ($row['active'] == 0 || $visibility == 0) {
                            $title = Display::tag('font', $cut_title, ['style' => 'color:grey']);
                        } else {
                            $title = $cut_title;
                        }

                        $overviewUrl = api_get_path(WEB_CODE_PATH).'exercise/overview.php';
                        $url = Security::remove_XSS(
                            '<a
                                '.$alt_title.'
                                id="tooltip_'.$row['iid'].'"
                                href="'.$overviewUrl.'?'.api_get_cidreq().$mylpid.$mylpitemid.'&exerciseId='.$row['iid'].'"
                            >
                             '.Display::return_icon('quiz.png', $row['title']).'
                             '.$title.'
                             </a>');

                        if (ExerciseLib::isQuizEmbeddable($row)) {
                            $embeddableIcon = Display::return_icon('om_integration.png', get_lang('ThisQuizCanBeEmbeddable'));
                            $url .= Display::div($embeddableIcon, ['class' => 'pull-right']);
                        }

                        $currentRow['title'] = $url.' '.$session_img.$lp_blocked;

                        if ($returnData) {
                            $currentRow['title'] = $exercise->getUnformattedTitle();
                        }

                        // Count number exercise - teacher
                        $sql = "SELECT count(*) count FROM $TBL_EXERCISE_QUESTION
                                WHERE c_id = $courseId AND exercice_id = $my_exercise_id";
                        $sqlresult = Database::query($sql);
                        $rowi = (int) Database::result($sqlresult, 0, 0);

                        if ($sessionId == $row['session_id']) {
                            // Questions list
                            $actions = Display::url(
                                Display::return_icon('edit.png', get_lang('Edit'), '', ICON_SIZE_SMALL),
                                'admin.php?'.api_get_cidreq().'&exerciseId='.$row['iid']
                            );

                            // Test settings
                            $settings = Display::url(
                                Display::return_icon('settings.png', get_lang('Configure'), '', ICON_SIZE_SMALL),
                                'exercise_admin.php?'.api_get_cidreq().'&exerciseId='.$row['iid']
                            );

                            if ($limitTeacherAccess && !api_is_platform_admin()) {
                                $settings = '';
                            }
                            $actions .= $settings;

                            // Exercise results
                            $resultsLink = '<a href="exercise_report.php?'.api_get_cidreq().'&exerciseId='.$row['iid'].'">'.
                                Display::return_icon('test_results.png', get_lang('Results'), '', ICON_SIZE_SMALL).'</a>';

                            if ($limitTeacherAccess) {
                                if (api_is_platform_admin()) {
                                    $actions .= $resultsLink;
                                }
                            } else {
                                // Exercise results
                                $actions .= $resultsLink;
                            }

                            // Auto launch
                            if ($autoLaunchAvailable) {
                                $autoLaunch = $exercise->getAutoLaunch();
                                if (empty($autoLaunch)) {
                                    $actions .= Display::url(
                                        Display::return_icon(
                                            'launch_na.png',
                                            get_lang('Enable'),
                                            '',
                                            ICON_SIZE_SMALL
                                        ),
                                        'exercise.php?'.api_get_cidreq().'&choice=enable_launch&sec_token='.$token.'&exerciseId='.$row['iid']
                                    );
                                } else {
                                    $actions .= Display::url(
                                        Display::return_icon(
                                            'launch.png',
                                            get_lang('Disable'),
                                            '',
                                            ICON_SIZE_SMALL
                                        ),
                                        'exercise.php?'.api_get_cidreq().'&choice=disable_launch&sec_token='.$token.'&exerciseId='.$row['iid']
                                    );
                                }
                            }

                            // Export
                            $actions .= Display::url(
                                Display::return_icon('cd.png', get_lang('CopyExercise')),
                                '',
                                [
                                    'onclick' => "javascript:if(!confirm('".addslashes(api_htmlentities(get_lang('AreYouSureToCopy'), ENT_QUOTES, $charset))." ".addslashes($row['title'])."?"."')) return false;",
                                    'href' => 'exercise.php?'.api_get_cidreq().'&choice=copy_exercise&sec_token='.$token.'&exerciseId='.$row['iid'],
                                ]
                            );

                            // Link to embed the quiz
                            $urlEmbed = api_get_path(WEB_CODE_PATH).'exercise/overview.php?'.api_get_cidreq().'&origin=iframe&exerciseId='.$row['iid'];
                            $actions .= Display::url(
                                Display::return_icon('new_link.png', get_lang('Embed')),
                                '',
                                [
                                    'class' => 'ajax',
                                    'data-title' => get_lang('EmbedExerciseLink'),
                                    'title' => get_lang('EmbedExerciseLink'),
                                    'data-content' => get_lang('CopyUrlToIncludeInIframe').'<br>'.$urlEmbed.'<br><br>'.get_lang('CopyIframeCodeToIncludeExercise').'<br><textarea rows=&quot;5&quot; cols=&quot;70&quot;>&lt;iframe width=&quot;840&quot; height=&quot;472&quot; src=&quot;'.$urlEmbed.'&quot; title=&quot;Chamilo exercise&quot;&gt;&lt;/iframe&gt;</textarea>',
                                    'href' => 'javascript:void(0);',
                                ]
                            );

                            // Clean exercise
                            $clean = '';
                            if (true === $allowClean) {
                                if (false == $locked) {
                                    $clean = Display::url(
                                        Display::return_icon(
                                            'clean.png',
                                            get_lang('CleanStudentResults'),
                                            '',
                                            ICON_SIZE_SMALL
                                        ),
                                        '',
                                        [
                                            'onclick' => "javascript:if(!confirm('".addslashes(
                                                    api_htmlentities(
                                                        get_lang('AreYouSureToDeleteResults'),
                                                        ENT_QUOTES,
                                                        $charset
                                                    )
                                                )." ".addslashes($row['title'])."?"."')) return false;",
                                            'href' => 'exercise.php?'.api_get_cidreq(
                                                ).'&choice=clean_results&sec_token='.$token.'&exerciseId='.$row['iid'],
                                        ]
                                    );
                                } else {
                                    $clean = Display::return_icon(
                                        'clean_na.png',
                                        get_lang('ResourceLockedByGradebook'),
                                        '',
                                        ICON_SIZE_SMALL
                                    );
                                }
                            }

                            $actions .= $clean;

                            // Visible / invisible
                            // Check if this exercise was added in a LP
                            if ($exercise->exercise_was_added_in_lp == true) {
                                $visibility = Display::return_icon(
                                    'invisible.png',
                                    get_lang('AddedToLPCannotBeAccessed'),
                                    '',
                                    ICON_SIZE_SMALL
                                );
                            } else {
                                if ($row['active'] == 0 || $visibility == 0) {
                                    $visibility = Display::url(
                                        Display::return_icon(
                                            'invisible.png',
                                            get_lang('Activate'),
                                            '',
                                            ICON_SIZE_SMALL
                                        ),
                                        'exercise.php?'.api_get_cidreq().'&choice=enable&sec_token='.$token.'&exerciseId='.$row['iid']
                                    );
                                } else {
                                    // else if not active
                                    $visibility = Display::url(
                                        Display::return_icon(
                                            'visible.png',
                                            get_lang('Deactivate'),
                                            '',
                                            ICON_SIZE_SMALL
                                        ),
                                        'exercise.php?'.api_get_cidreq().'&choice=disable&sec_token='.$token.'&exerciseId='.$row['iid']
                                    );
                                }
                            }

                            if ($limitTeacherAccess && !api_is_platform_admin()) {
                                $visibility = '';
                            }

                            $actions .= $visibility;

                            // Export qti ...
                            $export = Display::url(
                                Display::return_icon(
                                    'export_qti2.png',
                                    'IMS/QTI',
                                    '',
                                    ICON_SIZE_SMALL
                                ),
                                'exercise.php?action=exportqti2&exerciseId='.$row['iid'].'&'.api_get_cidreq()
                            );

                            if ($limitTeacherAccess && !api_is_platform_admin()) {
                                $export = '';
                            }

                            $actions .= $export;
                        } else {
                            // not session
                            $actions = Display::return_icon(
                                'edit_na.png',
                                get_lang('ExerciseEditionNotAvailableInSession')
                            );

                            // Check if this exercise was added in a LP
                            if ($exercise->exercise_was_added_in_lp == true) {
                                $visibility = Display::return_icon(
                                    'invisible.png',
                                    get_lang('AddedToLPCannotBeAccessed'),
                                    '',
                                    ICON_SIZE_SMALL
                                );
                            } else {
                                if ($row['active'] == 0 || $visibility == 0) {
                                    $visibility = Display::url(
                                        Display::return_icon(
                                            'invisible.png',
                                            get_lang('Activate'),
                                            '',
                                            ICON_SIZE_SMALL
                                        ),
                                        'exercise.php?'.api_get_cidreq().'&choice=enable&sec_token='.$token.'&exerciseId='.$row['iid']
                                    );
                                } else {
                                    // else if not active
                                    $visibility = Display::url(
                                        Display::return_icon(
                                            'visible.png',
                                            get_lang('Deactivate'),
                                            '',
                                            ICON_SIZE_SMALL
                                        ),
                                        'exercise.php?'.api_get_cidreq().'&choice=disable&sec_token='.$token.'&exerciseId='.$row['iid']
                                    );
                                }
                            }

                            if ($limitTeacherAccess && !api_is_platform_admin()) {
                                $visibility = '';
                            }

                            $actions .= $visibility;
                            $actions .= '<a href="exercise_report.php?'.api_get_cidreq().'&exerciseId='.$row['iid'].'">'.
                                Display::return_icon('test_results.png', get_lang('Results'), '', ICON_SIZE_SMALL).'</a>';
                            $actions .= Display::url(
                                Display::return_icon('cd.gif', get_lang('CopyExercise')),
                                '',
                                [
                                    'onclick' => "javascript:if(!confirm('".addslashes(api_htmlentities(get_lang('AreYouSureToCopy'), ENT_QUOTES, $charset))." ".addslashes($row['title'])."?"."')) return false;",
                                    'href' => 'exercise.php?'.api_get_cidreq().'&choice=copy_exercise&sec_token='.$token.'&exerciseId='.$row['iid'],
                                ]
                            );
                        }

                        // Delete
                        $delete = '';
                        if ($sessionId == $row['session_id']) {
                            if ($locked == false) {
                                $delete = Display::url(
                                    Display::return_icon(
                                        'delete.png',
                                        get_lang('Delete'),
                                        '',
                                        ICON_SIZE_SMALL
                                    ),
                                    '',
                                    [
                                        'onclick' => "javascript:if(!confirm('".addslashes(api_htmlentities(get_lang('AreYouSureToDeleteJS'), ENT_QUOTES, $charset))." ".addslashes($exercise->getUnformattedTitle())."?"."')) return false;",
                                        'href' => 'exercise.php?'.api_get_cidreq().'&choice=delete&sec_token='.$token.'&exerciseId='.$row['iid'],
                                    ]
                                );
                            } else {
                                $delete = Display::return_icon(
                                    'delete_na.png',
                                    get_lang('ResourceLockedByGradebook'),
                                    '',
                                    ICON_SIZE_SMALL
                                );
                            }
                        }

                        if ($limitTeacherAccess && !api_is_platform_admin()) {
                            $delete = '';
                        }

                        if (!empty($minCategoriesInExercise)) {
                            $cats = TestCategory::getListOfCategoriesForTest($exercise);
                            if (!(count($cats) >= $minCategoriesInExercise)) {
                                continue;
                            }
                        }

                        $actions .= $delete;
                        $usersToRemind = self::getUsersInExercise(
                            $row['iid'],
                            $row['c_id'],
                            $row['session_id'],
                            true
                        );
                        if ($usersToRemind > 0) {
                            $actions .= Display::url(
                                Display::return_icon('announce.png', get_lang('EmailNotifySubscription')),
                                '',
                                [
                                    'href' => '#!',
                                    'onclick' => 'showUserToSendNotificacion(this)',
                                    'data-link' => 'exercise.php?'.api_get_cidreq()
                                        .'&choice=send_reminder&sec_token='.$token.'&exerciseId='.$row['iid'],
                                ]
                            );
                        }

                        // Number of questions
                        $random_label = null;
                        if ($row['random'] > 0 || $row['random'] == -1) {
                            // if random == -1 means use random questions with all questions
                            $random_number_of_question = $row['random'];
                            if ($random_number_of_question == -1) {
                                $random_number_of_question = $rowi;
                            }
                            if ($row['random_by_category'] > 0) {
                                $nbQuestionsTotal = TestCategory::getNumberOfQuestionRandomByCategory(
                                    $my_exercise_id,
                                    $random_number_of_question
                                );
                                $number_of_questions = $nbQuestionsTotal.' ';
                                $number_of_questions .= ($nbQuestionsTotal > 1) ? get_lang('QuestionsLowerCase') : get_lang('QuestionLowerCase');
                                $number_of_questions .= ' - ';
                                $number_of_questions .= min(
                                        TestCategory::getNumberMaxQuestionByCat($my_exercise_id), $random_number_of_question
                                    ).' '.get_lang('QuestionByCategory');
                            } else {
                                $random_label = ' ('.get_lang('Random').') ';
                                $number_of_questions = $random_number_of_question.' '.$random_label.' / '.$rowi;
                                // Bug if we set a random value bigger than the real number of questions
                                if ($random_number_of_question > $rowi) {
                                    $number_of_questions = $rowi.' '.$random_label;
                                }
                            }
                        } else {
                            $number_of_questions = $rowi;
                        }

                        $currentRow['count_questions'] = $number_of_questions;
                    } else {
                        // Student only.
                        $visibility = api_get_item_visibility(
                            $courseInfo,
                            TOOL_QUIZ,
                            $my_exercise_id,
                            $sessionId
                        );

                        if ($visibility == 0) {
                            continue;
                        }

                        $url = '<a '.$alt_title.'  href="overview.php?'.api_get_cidreq().$mylpid.$mylpitemid.'&exerciseId='.$row['iid'].'">'.
                            $cut_title.'</a>';

                        // Link of the exercise.
                        $currentRow['title'] = $url.' '.$session_img;

                        if ($returnData) {
                            $currentRow['title'] = $exercise->getUnformattedTitle();
                        }

                        // This query might be improved later on by ordering by the new "tms" field rather than by exe_id
                        // Don't remove this marker: note-query-exe-results
                        $sql = "SELECT * FROM $TBL_TRACK_EXERCISES
                                WHERE
                                    exe_exo_id = ".$row['iid']." AND
                                    exe_user_id = $userId AND
                                    c_id = ".api_get_course_int_id()." AND
                                    status <> 'incomplete' AND
                                    orig_lp_id = 0 AND
                                    orig_lp_item_id = 0 AND
                                    session_id =  '".api_get_session_id()."'
                                ORDER BY exe_id DESC";

                        $qryres = Database::query($sql);
                        $num = Database::num_rows($qryres);

                        // Hide the results.
                        $my_result_disabled = $row['results_disabled'];

                        $attempt_text = '-';
                        // Time limits are on
                        if ($time_limits) {
                            // Exam is ready to be taken
                            if ($is_actived_time) {
                                // Show results
                                if (
                                in_array(
                                    $my_result_disabled,
                                    [
                                        RESULT_DISABLE_SHOW_SCORE_AND_EXPECTED_ANSWERS,
                                        RESULT_DISABLE_SHOW_SCORE_AND_EXPECTED_ANSWERS_AND_RANKING,
                                        RESULT_DISABLE_SHOW_SCORE_ONLY,
                                        RESULT_DISABLE_RANKING,
                                    ]
                                )
                                ) {
                                    // More than one attempt
                                    if ($num > 0) {
                                        $row_track = Database::fetch_array($qryres);
                                        $attempt_text = get_lang('LatestAttempt').' : ';
                                        $attempt_text .= ExerciseLib::show_score(
                                            $row_track['exe_result'],
                                            $row_track['exe_weighting']
                                        );
                                    } else {
                                        //No attempts
                                        $attempt_text = get_lang('NotAttempted');
                                    }
                                } else {
                                    $attempt_text = '-';
                                }
                            } else {
                                // Quiz not ready due to time limits
                                //@todo use the is_visible function
                                if (!empty($row['start_time']) && !empty($row['end_time'])) {
                                    $today = time();
                                    $start_time = api_strtotime($row['start_time'], 'UTC');
                                    $end_time = api_strtotime($row['end_time'], 'UTC');
                                    if ($today < $start_time) {
                                        $attempt_text = sprintf(
                                            get_lang('ExerciseWillBeActivatedFromXToY'),
                                            api_convert_and_format_date($row['start_time']),
                                            api_convert_and_format_date($row['end_time'])
                                        );
                                    } else {
                                        if ($today > $end_time) {
                                            $attempt_text = sprintf(
                                                get_lang('ExerciseWasActivatedFromXToY'),
                                                api_convert_and_format_date($row['start_time']),
                                                api_convert_and_format_date($row['end_time'])
                                            );
                                        }
                                    }
                                } else {
                                    //$attempt_text = get_lang('ExamNotAvailableAtThisTime');
                                    if (!empty($row['start_time'])) {
                                        $attempt_text = sprintf(
                                            get_lang('ExerciseAvailableFromX'),
                                            api_convert_and_format_date($row['start_time'])
                                        );
                                    }
                                    if (!empty($row['end_time'])) {
                                        $attempt_text = sprintf(
                                            get_lang('ExerciseAvailableUntilX'),
                                            api_convert_and_format_date($row['end_time'])
                                        );
                                    }
                                }
                            }
                        } else {
                            // Normal behaviour.
                            // Show results.
                            if (
                            in_array(
                                $my_result_disabled,
                                [
                                    RESULT_DISABLE_SHOW_SCORE_AND_EXPECTED_ANSWERS,
                                    RESULT_DISABLE_SHOW_SCORE_AND_EXPECTED_ANSWERS_AND_RANKING,
                                    RESULT_DISABLE_SHOW_SCORE_ONLY,
                                    RESULT_DISABLE_RANKING,
                                    RESULT_DISABLE_SHOW_SCORE_ATTEMPT_SHOW_ANSWERS_LAST_ATTEMPT_NO_FEEDBACK,
                                ]
                            )
                            ) {
                                if ($num > 0) {
                                    $row_track = Database::fetch_array($qryres);
                                    $attempt_text = get_lang('LatestAttempt').' : ';
                                    $attempt_text .= ExerciseLib::show_score(
                                        $row_track['exe_result'],
                                        $row_track['exe_weighting']
                                    );
                                } else {
                                    $attempt_text = get_lang('NotAttempted');
                                }
                            }
                        }

                        if ($returnData) {
                            $attempt_text = $num;
                        }
                    }

                    $currentRow['attempt'] = $attempt_text;

                    if ($isAllowedToEdit) {
                        $additionalActions = ExerciseLib::getAdditionalTeacherActions($row['iid']);

                        if (!empty($additionalActions)) {
                            $actions .= $additionalActions.PHP_EOL;
                        }

                        // Replace with custom actions.
                        if (!empty($myActions) && is_callable($myActions)) {
                            $actions = $myActions($row);
                        }

                        $rowTitle = $currentRow['title'];
                        $currentRow = [
                            $row['iid'],
                            $rowTitle,
                            $currentRow['count_questions'],
                            $actions,
                        ];

                        if ($returnData) {
                            $currentRow['id'] = $exercise->iid;
                            $currentRow['url'] = $webPath.'exercise/overview.php?'
                                .api_get_cidreq_params($courseInfo['code'], $sessionId).'&'
                                ."$mylpid$mylpitemid&exerciseId={$row['iid']}";
                            $currentRow['name'] = $rowTitle;
                        }
                    } else {
                        $rowTitle = $currentRow['title'];
                        $currentRow = [
                            $rowTitle,
                            $currentRow['attempt'],
                        ];

                        if ($isDrhOfCourse) {
                            $currentRow[] = '<a href="exercise_report.php?'.api_get_cidreq().'&exerciseId='.$row['iid'].'">'.
                                Display::return_icon('test_results.png', get_lang('Results'), '', ICON_SIZE_SMALL).'</a>';
                        }

                        if ($returnData) {
                            $currentRow['id'] = $exercise->iid;
                            $currentRow['url'] = $webPath.'exercise/overview.php?'
                                .api_get_cidreq_params($courseInfo['code'], $sessionId).'&'
                                ."$mylpid$mylpitemid&exerciseId={$row['iid']}";
                            $currentRow['name'] = $rowTitle;
                        }
                    }

                    $tableRows[] = $currentRow;
                }
            }
        }

        // end exercise list
        // Hotpotatoes results
        if ($isAllowedToEdit) {
            $sql = "SELECT d.iid, d.path as path, d.comment as comment
                    FROM $TBL_DOCUMENT d
                    WHERE
                        d.c_id = $courseId AND
                        (d.path LIKE '%htm%') AND
                        d.path  LIKE '".Database::escape_string($uploadPath.'/%/%')."'
                    LIMIT $from , $limit"; // only .htm or .html files listed
        } else {
            $sql = "SELECT d.iid, d.path as path, d.comment as comment
                    FROM $TBL_DOCUMENT d
                    WHERE
                        d.c_id = $courseId AND
                        (d.path LIKE '%htm%') AND
                        d.path  LIKE '".Database::escape_string($uploadPath.'/%/%')."'
                    LIMIT $from , $limit";
        }

        $result = Database::query($sql);
        $attributes = [];
        while ($row = Database::fetch_array($result, 'ASSOC')) {
            $attributes[$row['iid']] = $row;
        }

        $nbrActiveTests = 0;
        if (!empty($attributes)) {
            foreach ($attributes as $item) {
                $id = $item['iid'];
                $path = $item['path'];

                $title = GetQuizName($path, $documentPath);
                if ($title == '') {
                    $title = basename($path);
                }

                // prof only
                if ($isAllowedToEdit) {
                    $visibility = api_get_item_visibility(
                        ['real_id' => $courseId],
                        TOOL_DOCUMENT,
                        $id,
                        0
                    );

                    if (!empty($sessionId)) {
                        if (0 == $visibility) {
                            continue;
                        }

                        $visibility = api_get_item_visibility(
                            ['real_id' => $courseId],
                            TOOL_DOCUMENT,
                            $id,
                            $sessionId
                        );
                    }

                    $title =
                        implode(PHP_EOL, [
                            Display::return_icon('hotpotatoes_s.png', 'HotPotatoes'),
                            Display::url(
                                $title,
                                'showinframes.php?'.api_get_cidreq().'&'.http_build_query([
                                    'file' => $path,
                                    'uid' => $userId,
                                ]),
                                ['class' => $visibility == 0 ? 'text-muted' : null]
                            ),
                        ]);

                    $actions = Display::url(
                        Display::return_icon(
                            'edit.png',
                            get_lang('Edit'),
                            '',
                            ICON_SIZE_SMALL
                        ),
                        'adminhp.php?'.api_get_cidreq().'&hotpotatoesName='.$path
                    );

                    $actions .= '<a href="hotpotatoes_exercise_report.php?'.api_get_cidreq().'&path='.$path.'">'.
                        Display::return_icon('test_results.png', get_lang('Results'), '', ICON_SIZE_SMALL).
                        '</a>';

                    // if active
                    if ($visibility != 0) {
                        $nbrActiveTests = $nbrActiveTests + 1;
                        $actions .= '      <a href="'.$exercisePath.'?'.api_get_cidreq().'&hpchoice=disable&file='.$path.'">'.
                            Display::return_icon('visible.png', get_lang('Deactivate'), '', ICON_SIZE_SMALL).'</a>';
                    } else { // else if not active
                        $actions .= '    <a href="'.$exercisePath.'?'.api_get_cidreq().'&hpchoice=enable&file='.$path.'">'.
                            Display::return_icon('invisible.png', get_lang('Activate'), '', ICON_SIZE_SMALL).'</a>';
                    }
                    $actions .= '<a href="'.$exercisePath.'?'.api_get_cidreq().'&hpchoice=delete&file='.$path.'" onclick="javascript:if(!confirm(\''.addslashes(api_htmlentities(get_lang('AreYouSureToDeleteJS'), ENT_QUOTES, $charset)).'\')) return false;">'.
                        Display::return_icon('delete.png', get_lang('Delete'), '', ICON_SIZE_SMALL).'</a>';

                    $currentRow = [
                        '',
                        $title,
                        '',
                        $actions,
                    ];
                } else {
                    $visibility = api_get_item_visibility(
                        ['real_id' => $courseId],
                        TOOL_DOCUMENT,
                        $id,
                        $sessionId
                    );

                    if (0 == $visibility) {
                        continue;
                    }

                    // Student only
                    $attempt = ExerciseLib::getLatestHotPotatoResult(
                        $path,
                        $userId,
                        api_get_course_int_id(),
                        api_get_session_id()
                    );

                    $nbrActiveTests = $nbrActiveTests + 1;
                    $title = Display::url(
                        $title,
                        'showinframes.php?'.api_get_cidreq().'&'.http_build_query(
                            [
                                'file' => $path,
                                'cid' => api_get_course_id(),
                                'uid' => $userId,
                            ]
                        )
                    );

                    if (!empty($attempt)) {
                        $actions = '<a href="hotpotatoes_exercise_report.php?'.api_get_cidreq().'&path='.$path.'&filter_by_user='.$userId.'">'.Display::return_icon('test_results.png', get_lang('Results'), '', ICON_SIZE_SMALL).'</a>';
                        $attemptText = get_lang('LatestAttempt').' : ';
                        $attemptText .= ExerciseLib::show_score(
                                $attempt['exe_result'],
                                $attempt['exe_weighting']
                            ).' ';
                        $attemptText .= $actions;
                    } else {
                        // No attempts.
                        $attemptText = get_lang('NotAttempted').' ';
                    }

                    $currentRow = [
                        $title,
                        $attemptText,
                    ];

                    if ($isDrhOfCourse) {
                        $currentRow[] = '<a href="hotpotatoes_exercise_report.php?'.api_get_cidreq().'&path='.$path.'">'.
                            Display::return_icon('test_results.png', get_lang('Results'), '', ICON_SIZE_SMALL).'</a>';
                    }
                }

                $tableRows[] = $currentRow;
            }
        }

        if ($returnData) {
            return $tableRows;
        }

        if (empty($tableRows) && empty($categoryId)) {
            if ($isAllowedToEdit && $origin !== 'learnpath') {
                $content .= '<div id="no-data-view">';
                $content .= '<h3>'.get_lang('Quiz').'</h3>';
                $content .= Display::return_icon('quiz.png', '', [], 64);
                $content .= '<div class="controls">';
                $content .= Display::url(
                    '<em class="fa fa-plus"></em> '.get_lang('NewEx'),
                    'exercise_admin.php?'.api_get_cidreq(),
                    ['class' => 'btn btn-primary']
                );
                $content .= '</div>';
                $content .= '</div>';
            }
        } else {
            if (empty($tableRows)) {
                return '';
            }

            if (true === api_get_configuration_value('allow_exercise_categories') && empty($categoryId)) {
                echo Display::page_subheader(get_lang('NoCategory'));
            }

            $table->setTableData($tableRows);
            $table->setTotalNumberOfItems($total);
            $table->set_additional_parameters([
                'cidReq' => api_get_course_id(),
                'id_session' => api_get_session_id(),
                'category_id' => $categoryId,
            ]);

            if ($isAllowedToEdit) {
                $formActions = [];
                $formActions['visible'] = get_lang('Activate');
                $formActions['invisible'] = get_lang('Deactivate');
                $formActions['delete'] = get_lang('Delete');
                $table->set_form_actions($formActions);
            }

            $i = 0;
            if ($isAllowedToEdit) {
                $table->set_header($i++, '', false, 'width="18px"');
            }
            $table->set_header($i++, get_lang('ExerciseName'), false);

            if ($isAllowedToEdit) {
                $table->set_header($i++, get_lang('QuantityQuestions'), false);
                $table->set_header($i++, get_lang('Actions'), false);
            } else {
                $table->set_header($i++, get_lang('Status'), false);
                if ($isDrhOfCourse) {
                    $table->set_header($i++, get_lang('Actions'), false);
                }
            }

            if ($returnTable) {
                return $table;
            }

            $content .= $table->return_table();
        }

        return $content;
    }

    /**
     * @return int value in minutes
     */
    public function getResultAccess()
    {
        $extraFieldValue = new ExtraFieldValue('exercise');
        $value = $extraFieldValue->get_values_by_handler_and_field_variable(
            $this->iid,
            'results_available_for_x_minutes'
        );

        if (!empty($value) && isset($value['value'])) {
            return (int) $value['value'];
        }

        return 0;
    }

    /**
     * @param array $exerciseResultInfo
     *
     * @return bool
     */
    public function getResultAccessTimeDiff($exerciseResultInfo)
    {
        $value = $this->getResultAccess();
        if (!empty($value)) {
            $endDate = new DateTime($exerciseResultInfo['exe_date'], new DateTimeZone('UTC'));
            $endDate->add(new DateInterval('PT'.$value.'M'));
            $now = time();
            if ($endDate->getTimestamp() > $now) {
                return (int) $endDate->getTimestamp() - $now;
            }
        }

        return 0;
    }

    /**
     * @param array $exerciseResultInfo
     *
     * @return bool
     */
    public function hasResultsAccess($exerciseResultInfo)
    {
        $diff = $this->getResultAccessTimeDiff($exerciseResultInfo);
        if (0 === $diff) {
            return false;
        }

        return true;
    }

    /**
     * @return int
     */
    public function getResultsAccess()
    {
        $extraFieldValue = new ExtraFieldValue('exercise');
        $value = $extraFieldValue->get_values_by_handler_and_field_variable(
            $this->iid,
            'results_available_for_x_minutes'
        );
        if (!empty($value)) {
            return (int) $value;
        }

        return 0;
    }

    /**
     * Get results of a delineation type question.
     * Params described here are only non-typed params.
     *
     * @param int   $questionId
     * @param bool  $show_results
     * @param array $question_result
     */
    public function getDelineationResult(Question $objQuestionTmp, $questionId, $show_results, $question_result)
    {
        $id = $objQuestionTmp->iid;
        $questionId = (int) $questionId;

        $final_overlap = $question_result['extra']['final_overlap'];
        $final_missing = $question_result['extra']['final_missing'];
        $final_excess = $question_result['extra']['final_excess'];

        $overlap_color = $question_result['extra']['overlap_color'];
        $missing_color = $question_result['extra']['missing_color'];
        $excess_color = $question_result['extra']['excess_color'];

        $threadhold1 = $question_result['extra']['threadhold1'];
        $threadhold2 = $question_result['extra']['threadhold2'];
        $threadhold3 = $question_result['extra']['threadhold3'];

        if ($show_results) {
            if ($overlap_color) {
                $overlap_color = 'green';
            } else {
                $overlap_color = 'red';
            }

            if ($missing_color) {
                $missing_color = 'green';
            } else {
                $missing_color = 'red';
            }
            if ($excess_color) {
                $excess_color = 'green';
            } else {
                $excess_color = 'red';
            }

            if (!is_numeric($final_overlap)) {
                $final_overlap = 0;
            }

            if (!is_numeric($final_missing)) {
                $final_missing = 0;
            }
            if (!is_numeric($final_excess)) {
                $final_excess = 0;
            }

            if ($final_excess > 100) {
                $final_excess = 100;
            }

            $table_resume = '
                    <table class="table table-hover table-striped data_table">
                        <tr class="row_odd" >
                            <td>&nbsp;</td>
                            <td><b>'.get_lang('Requirements').'</b></td>
                            <td><b>'.get_lang('YourAnswer').'</b></td>
                        </tr>
                        <tr class="row_even">
                            <td><b>'.get_lang('Overlap').'</b></td>
                            <td>'.get_lang('Min').' '.$threadhold1.'</td>
                            <td>
                                <div style="color:'.$overlap_color.'">
                                    '.(($final_overlap < 0) ? 0 : intval($final_overlap)).'
                                </div>
                            </td>
                        </tr>
                        <tr>
                            <td><b>'.get_lang('Excess').'</b></td>
                            <td>'.get_lang('Max').' '.$threadhold2.'</td>
                            <td>
                                <div style="color:'.$excess_color.'">
                                    '.(($final_excess < 0) ? 0 : intval($final_excess)).'
                                </div>
                            </td>
                        </tr>
                        <tr class="row_even">
                            <td><b>'.get_lang('Missing').'</b></td>
                            <td>'.get_lang('Max').' '.$threadhold3.'</td>
                            <td>
                                <div style="color:'.$missing_color.'">
                                    '.(($final_missing < 0) ? 0 : intval($final_missing)).'
                                </div>
                            </td>
                        </tr>
                    </table>
                ';

            $answerType = $objQuestionTmp->selectType();
            if ($answerType != HOT_SPOT_DELINEATION) {
                $item_list = explode('@@', $destination);
                $try = $item_list[0];
                $lp = $item_list[1];
                $destinationid = $item_list[2];
                $url = $item_list[3];
                $table_resume = '';
            } else {
                if ($next == 0) {
                    $try = $try_hotspot;
                    $lp = $lp_hotspot;
                    $destinationid = $select_question_hotspot;
                    $url = $url_hotspot;
                } else {
                    //show if no error
                    $comment = $answerComment = $objAnswerTmp->selectComment($nbrAnswers);
                    $answerDestination = $objAnswerTmp->selectDestination($nbrAnswers);
                }
            }

            echo '<h1><div style="color:#333;">'.get_lang('Feedback').'</div></h1>';
            if ($answerType == HOT_SPOT_DELINEATION) {
                if ($organs_at_risk_hit > 0) {
                    $message = '<br />'.get_lang('ResultIs').' <b>'.$result_comment.'</b><br />';
                    $message .= '<p style="color:#DC0A0A;"><b>'.get_lang('OARHit').'</b></p>';
                } else {
                    $message = '<p>'.get_lang('YourDelineation').'</p>';
                    $message .= $table_resume;
                    $message .= '<br />'.get_lang('ResultIs').' <b>'.$result_comment.'</b><br />';
                }
                $message .= '<p>'.$comment.'</p>';
                echo $message;
            } else {
                echo '<p>'.$comment.'</p>';
            }

            // Showing the score
            /*$queryfree = "SELECT marks FROM $TBL_TRACK_ATTEMPT
                          WHERE exe_id = $id AND question_id =  $questionId";
            $resfree = Database::query($queryfree);
            $questionScore = Database::result($resfree, 0, 'marks');
            $totalScore += $questionScore;*/
            $relPath = api_get_path(REL_CODE_PATH);
            echo '</table></td></tr>';
            echo "
                        <tr>
                            <td colspan=\"2\">
                                <div id=\"hotspot-solution\"></div>
                                <script>
                                    $(function() {
                                        new HotspotQuestion({
                                            questionId: $questionId,
                                            exerciseId: {$this->iid},
                                            exeId: $id,
                                            selector: '#hotspot-solution',
                                            for: 'solution',
                                            relPath: '$relPath'
                                        });
                                    });
                                </script>
                            </td>
                        </tr>
                    </table>
                ";
        }
    }

    /**
     * Clean exercise session variables.
     */
    public static function cleanSessionVariables()
    {
        Session::erase('objExercise');
        Session::erase('exe_id');
        Session::erase('calculatedAnswerId');
        Session::erase('duration_time_previous');
        Session::erase('duration_time');
        Session::erase('objQuestion');
        Session::erase('objAnswer');
        Session::erase('questionList');
        Session::erase('categoryList');
        Session::erase('exerciseResult');
        Session::erase('firstTime');
        Session::erase('time_per_question');
        Session::erase('question_start');
        Session::erase('exerciseResultCoordinates');
        Session::erase('hotspot_coord');
        Session::erase('hotspot_dest');
        Session::erase('hotspot_delineation_result');
    }

    /**
     * Get the first LP found matching the session ID.
     *
     * @param int $sessionId
     *
     * @return array
     */
    public function getLpBySession($sessionId)
    {
        if (!empty($this->lpList)) {
            $sessionId = (int) $sessionId;

            foreach ($this->lpList as $lp) {
                if ((int) $lp['session_id'] == $sessionId) {
                    return $lp;
                }
            }

            return current($this->lpList);
        }

        return [
            'lp_id' => 0,
            'max_score' => 0,
            'session_id' => 0,
        ];
    }

    public static function saveExerciseInLp($safe_item_id, $safe_exe_id)
    {
        $lp = Session::read('oLP');

        $safe_exe_id = (int) $safe_exe_id;
        $safe_item_id = (int) $safe_item_id;

        if (empty($lp) || empty($safe_exe_id) || empty($safe_item_id)) {
            return false;
        }

        $viewId = $lp->get_view_id();
        $course_id = api_get_course_int_id();
        $userId = (int) api_get_user_id();
        $viewId = (int) $viewId;

        $TBL_TRACK_EXERCICES = Database::get_main_table(TABLE_STATISTIC_TRACK_E_EXERCISES);
        $TBL_LP_ITEM_VIEW = Database::get_course_table(TABLE_LP_ITEM_VIEW);
        $TBL_LP_ITEM = Database::get_course_table(TABLE_LP_ITEM);

        $sql = "SELECT start_date, exe_date, exe_result, exe_weighting, exe_exo_id, exe_duration
                FROM $TBL_TRACK_EXERCICES
                WHERE exe_id = $safe_exe_id AND exe_user_id = $userId";
        $res = Database::query($sql);
        $row_dates = Database::fetch_array($res);

        if (empty($row_dates)) {
            return false;
        }

        $duration = (int) $row_dates['exe_duration'];
        $score = (float) $row_dates['exe_result'];
        $max_score = (float) $row_dates['exe_weighting'];

        $sql = "UPDATE $TBL_LP_ITEM SET
                    max_score = '$max_score'
                WHERE iid = $safe_item_id";
        Database::query($sql);

        $sql = "SELECT iid FROM $TBL_LP_ITEM_VIEW
                WHERE
                    c_id = $course_id AND
                    lp_item_id = $safe_item_id AND
                    lp_view_id = $viewId
                ORDER BY id DESC
                LIMIT 1";
        $res_last_attempt = Database::query($sql);

        if (Database::num_rows($res_last_attempt) && !api_is_invitee()) {
            $row_last_attempt = Database::fetch_row($res_last_attempt);
            $lp_item_view_id = $row_last_attempt[0];

            $exercise = new Exercise($course_id);
            $exercise->read($row_dates['exe_exo_id']);
            $status = 'completed';

            if (!empty($exercise->pass_percentage)) {
                $status = 'failed';
                $success = ExerciseLib::isSuccessExerciseResult(
                    $score,
                    $max_score,
                    $exercise->pass_percentage
                );
                if ($success) {
                    $status = 'passed';
                }
            }

            $sql = "UPDATE $TBL_LP_ITEM_VIEW SET
                        status = '$status',
                        score = $score,
                        total_time = $duration
                    WHERE iid = $lp_item_view_id";
            Database::query($sql);

            $sql = "UPDATE $TBL_TRACK_EXERCICES SET
                        orig_lp_item_view_id = $lp_item_view_id
                    WHERE exe_id = ".$safe_exe_id;
            Database::query($sql);
        }
    }

    /**
     * Get the user answers saved in exercise.
     *
     * @param int $attemptId
     *
     * @return array
     */
    public function getUserAnswersSavedInExercise($attemptId)
    {
        $exerciseResult = [];
        $attemptList = Event::getAllExerciseEventByExeId($attemptId);

        foreach ($attemptList as $questionId => $options) {
            foreach ($options as $option) {
                $question = Question::read($option['question_id']);
                if ($question) {
                    switch ($question->type) {
                        case FILL_IN_BLANKS:
                        case FILL_IN_BLANKS_COMBINATION:
                            $option['answer'] = $this->fill_in_blank_answer_to_string($option['answer']);
                            if ($option['answer'] === "0") {
                                $option['answer'] = "there is 0 as answer so we do not want to consider it empty";
                            }
                            break;
                    }
                }

                if (!empty($option['answer'])) {
                    $exerciseResult[] = $questionId;

                    break;
                }
            }
        }

        return $exerciseResult;
    }

    /**
     * Get the number of user answers saved in exercise.
     *
     * @param int $attemptId
     *
     * @return int
     */
    public function countUserAnswersSavedInExercise($attemptId)
    {
        $answers = $this->getUserAnswersSavedInExercise($attemptId);

        return count($answers);
    }

    public static function allowAction($action)
    {
        if (api_is_platform_admin()) {
            return true;
        }

        $limitTeacherAccess = api_get_configuration_value('limit_exercise_teacher_access');
        $disableClean = api_get_configuration_value('disable_clean_exercise_results_for_teachers');

        switch ($action) {
            case 'delete':
                if (api_is_allowed_to_edit(null, true)) {
                    if ($limitTeacherAccess) {
                        return false;
                    }

                    return true;
                }
                break;
            case 'clean_results':
                if (api_is_allowed_to_edit(null, true)) {
                    if ($limitTeacherAccess) {
                        return false;
                    }

                    if ($disableClean) {
                        return false;
                    }

                    return true;
                }

                break;
        }

        return false;
    }

    public static function getLpListFromExercise($exerciseId, $courseId)
    {
        $tableLpItem = Database::get_course_table(TABLE_LP_ITEM);
        $tblLp = Database::get_course_table(TABLE_LP_MAIN);

        $exerciseId = (int) $exerciseId;
        $courseId = (int) $courseId;

        $sql = "SELECT
                    lp.name,
                    lpi.lp_id,
                    lpi.max_score,
                    lp.session_id
                FROM $tableLpItem lpi
                INNER JOIN $tblLp lp
                ON (lpi.lp_id = lp.iid AND lpi.c_id = lp.c_id)
                WHERE
                    lpi.c_id = $courseId AND
                    lpi.item_type = '".TOOL_QUIZ."' AND
                    lpi.path = '$exerciseId'";
        $result = Database::query($sql);
        $lpList = [];
        if (Database::num_rows($result) > 0) {
            $lpList = Database::store_result($result, 'ASSOC');
        }

        return $lpList;
    }

    public function getReminderTable($questionList, $exercise_stat_info, $disableCheckBoxes = false)
    {
        $learnpath_id = isset($_REQUEST['learnpath_id']) ? (int) $_REQUEST['learnpath_id'] : 0;
        $learnpath_item_id = isset($_REQUEST['learnpath_item_id']) ? (int) $_REQUEST['learnpath_item_id'] : 0;
        $learnpath_item_view_id = isset($_REQUEST['learnpath_item_view_id']) ? (int) $_REQUEST['learnpath_item_view_id'] : 0;
        $categoryId = isset($_REQUEST['category_id']) ? (int) $_REQUEST['category_id'] : 0;

        if (empty($exercise_stat_info)) {
            return '';
        }

        $remindList = $exercise_stat_info['questions_to_check'];
        $remindList = explode(',', $remindList);
        $exeId = $exercise_stat_info['exe_id'];
        $exerciseId = $exercise_stat_info['exe_exo_id'];
        $exercise_result = $this->getUserAnswersSavedInExercise($exeId);

        $content = Display::label(get_lang('QuestionWithNoAnswer'), 'danger');
        $content .= '<div class="clear"></div><br />';
        $table = '';
        $counter = 0;
        // Loop over all question to show results for each of them, one by one
        foreach ($questionList as $questionId) {
            $objQuestionTmp = Question::read($questionId);
            $check_id = 'remind_list['.$questionId.']';
            $attributes = [
                'id' => $check_id,
                'onclick' => "save_remind_item(this, '$questionId');",
                'data-question-id' => $questionId,
            ];
            if (in_array($questionId, $remindList)) {
                $attributes['checked'] = 1;
            }

            $checkbox = Display::input('checkbox', 'remind_list['.$questionId.']', '', $attributes);
            $checkbox = '<div class="pretty p-svg p-curve">
                        '.$checkbox.'
                        <div class="state p-primary ">
                         <svg class="svg svg-icon" viewBox="0 0 20 20">
                            <path d="M7.629,14.566c0.125,0.125,0.291,0.188,0.456,0.188c0.164,0,0.329-0.062,0.456-0.188l8.219-8.221c0.252-0.252,0.252-0.659,0-0.911c-0.252-0.252-0.659-0.252-0.911,0l-7.764,7.763L4.152,9.267c-0.252-0.251-0.66-0.251-0.911,0c-0.252,0.252-0.252,0.66,0,0.911L7.629,14.566z" style="stroke: white;fill:white;"></path>
                         </svg>
                         <label>&nbsp;</label>
                        </div>
                    </div>';
            $counter++;
            $questionTitle = $counter.'. '.strip_tags($objQuestionTmp->selectTitle());
            // Check if the question doesn't have an answer.
            if (!in_array($questionId, $exercise_result)) {
                $questionTitle = Display::label($questionTitle, 'danger');
            }
            $label_attributes = [];
            $label_attributes['for'] = $check_id;
            if (false === $disableCheckBoxes) {
                $questionTitle = Display::tag('label', $checkbox.$questionTitle, $label_attributes);
            }
            $table .= Display::div($questionTitle, ['class' => 'exercise_reminder_item ']);
        }

        $content .= Display::div('', ['id' => 'message']).
                    Display::div($table, ['class' => 'question-check-test']);

        $content .= '<script>
        var lp_data = $.param({
            "learnpath_id": '.$learnpath_id.',
            "learnpath_item_id" : '.$learnpath_item_id.',
            "learnpath_item_view_id": '.$learnpath_item_view_id.'
        });

        function final_submit() {
            // Normal inputs.
            window.location = "'.api_get_path(WEB_CODE_PATH).'exercise/exercise_result.php?'.api_get_cidreq().'&exe_id='.$exeId.'&" + lp_data;
        }

        function selectAll() {
            $("input[type=checkbox]").each(function () {
                $(this).prop("checked", 1);
                var question_id = $(this).data("question-id");
                var action = "add";
                $.ajax({
                    url: "'.api_get_path(WEB_AJAX_PATH).'exercise.ajax.php?'.api_get_cidreq().'&a=add_question_to_reminder",
                    data: "question_id="+question_id+"&exe_id='.$exeId.'&action="+action,
                    success: function(returnValue) {
                    }
                });
            });
        }

        function changeOptionStatus(status)
        {
            $("input[type=checkbox]").each(function () {
                $(this).prop("checked", status);
            });
            var action = "";
            var option = "remove_all";
            if (status == 1) {
                option = "add_all";
            }
            $.ajax({
                url: "'.api_get_path(WEB_AJAX_PATH).'exercise.ajax.php?'.api_get_cidreq().'&a=add_question_to_reminder",
                data: "option="+option+"&exe_id='.$exeId.'&action="+action,
                success: function(returnValue) {
                }
            });
        }

        function reviewQuestions() {
            var isChecked = 1;
            $("input[type=checkbox]").each(function () {
                if ($(this).prop("checked")) {
                    isChecked = 2;
                    return false;
                }
            });

            if (isChecked == 1) {
                $("#message").addClass("warning-message");
                $("#message").html("'.addslashes(get_lang('SelectAQuestionToReview')).'");
            } else {
                window.location = "exercise_submit.php?'.api_get_cidreq().'&category_id='.$categoryId.'&exerciseId='.$exerciseId.'&reminder=2&" + lp_data;
            }
        }

        function save_remind_item(obj, question_id) {
            var action = "";
            if ($(obj).prop("checked")) {
                action = "add";
            } else {
                action = "delete";
            }
            $.ajax({
                url: "'.api_get_path(WEB_AJAX_PATH).'exercise.ajax.php?'.api_get_cidreq().'&a=add_question_to_reminder",
                data: "question_id="+question_id+"&exe_id='.$exeId.'&action="+action,
                success: function(returnValue) {
                }
            });
        }
        </script>';

        return $content;
    }

    public function getRadarsFromUsers($userList, $exercises, $dataSetLabels, $courseId, $sessionId)
    {
        $dataSet = [];
        $labels = [];
        $labelsWithId = [];
        $cutLabelAtChar = 30;
        /** @var Exercise $exercise */
        foreach ($exercises as $exercise) {
            if (empty($labels)) {
                $categoryNameList = TestCategory::getListOfCategoriesNameForTest($exercise->iid);
                if (!empty($categoryNameList)) {
                    $labelsWithId = array_column($categoryNameList, 'title', 'iid');
                    asort($labelsWithId);
                    $labels = array_values($labelsWithId);
                    foreach ($labels as $labelId => $label) {
                        // Cut if label is too long to maintain chart visibility
                        $labels[$labelId] = cut($label, $cutLabelAtChar);
                    }
                }
            }

            foreach ($userList as $userId) {
                $results = Event::getExerciseResultsByUser(
                    $userId,
                    $exercise->iid,
                    $courseId,
                    $sessionId
                );

                if ($results) {
                    $firstAttempt = end($results);
                    $exeId = $firstAttempt['exe_id'];

                    ob_start();
                    $stats = ExerciseLib::displayQuestionListByAttempt(
                        $exercise,
                        $exeId,
                        false
                    );
                    ob_end_clean();

                    $categoryList = $stats['category_list'];
                    $tempResult = [];
                    foreach ($labelsWithId as $category_id => $title) {
                        if (isset($categoryList[$category_id])) {
                            $categoryItem = $categoryList[$category_id];
                            if ($categoryItem['total'] > 0) {
                                $tempResult[] = round($categoryItem['score'] / $categoryItem['total'] * 10);
                            } else {
                                $tempResult[] = 0;
                            }
                        } else {
                            $tempResult[] = 0;
                        }
                    }
                    $dataSet[] = $tempResult;
                }
            }
        }

        return $this->getRadar($labels, $dataSet, $dataSetLabels);
    }

    public function getAverageRadarsFromUsers($userList, $exercises, $dataSetLabels, $courseId, $sessionId)
    {
        $dataSet = [];
        $labels = [];
        $labelsWithId = [];
        $cutLabelAtChar = 30;
        $tempResult = [];
        /** @var Exercise $exercise */
        foreach ($exercises as $exercise) {
            $exerciseId = $exercise->iid;
            if (empty($labels)) {
                $categoryNameList = TestCategory::getListOfCategoriesNameForTest($exercise->iid);
                if (!empty($categoryNameList)) {
                    $labelsWithId = array_column($categoryNameList, 'title', 'iid');
                    asort($labelsWithId);
                    $labels = array_values($labelsWithId);
                    foreach ($labels as $labelId => $label) {
                        // Cut if label is too long to maintain chart visibility
                        $labels[$labelId] = cut($label, $cutLabelAtChar);
                    }
                }
            }

            foreach ($userList as $userId) {
                $results = Event::getExerciseResultsByUser(
                    $userId,
                    $exerciseId,
                    $courseId,
                    $sessionId
                );

                if ($results) {
                    $firstAttempt = end($results);
                    $exeId = $firstAttempt['exe_id'];

                    ob_start();
                    $stats = ExerciseLib::displayQuestionListByAttempt(
                        $exercise,
                        $exeId,
                        false
                    );
                    ob_end_clean();

                    $categoryList = $stats['category_list'];
                    foreach ($labelsWithId as $category_id => $title) {
                        if (isset($categoryList[$category_id])) {
                            $categoryItem = $categoryList[$category_id];
                            if (!isset($tempResult[$exerciseId][$category_id])) {
                                $tempResult[$exerciseId][$category_id] = 0;
                            }
                            $tempResult[$exerciseId][$category_id] +=
                                $categoryItem['score'] / $categoryItem['total'] * 10;
                        }
                    }
                }
            }
        }

        foreach ($exercises as $exercise) {
            $exerciseId = $exercise->iid;
            $totalResults = ExerciseLib::getNumberStudentsFinishExercise($exerciseId, $courseId, $sessionId);
            $data = [];
            foreach ($labelsWithId as $category_id => $title) {
                if (isset($tempResult[$exerciseId]) && isset($tempResult[$exerciseId][$category_id])) {
                    $data[] = round($tempResult[$exerciseId][$category_id] / $totalResults);
                } else {
                    $data[] = 0;
                }
            }
            $dataSet[] = $data;
        }

        return $this->getRadar($labels, $dataSet, $dataSetLabels);
    }

    public function getRadar($labels, $dataSet, $dataSetLabels = [])
    {
        if (empty($labels) || empty($dataSet)) {
            return '';
        }

        $displayLegend = 0;
        if (!empty($dataSetLabels)) {
            $displayLegend = 1;
        }

        $labels = json_encode($labels);

        $colorList = ChamiloApi::getColorPalette(true, true);

        $dataSetToJson = [];
        $counter = 0;
        foreach ($dataSet as $index => $resultsArray) {
            $color = isset($colorList[$counter]) ? $colorList[$counter] : 'rgb('.rand(0, 255).', '.rand(0, 255).', '.rand(0, 255).', 1.0)';

            $label = isset($dataSetLabels[$index]) ? $dataSetLabels[$index] : '';
            $background = str_replace('1.0', '0.2', $color);
            $dataSetToJson[] = [
                'fill' => false,
                'label' => $label,
                'backgroundColor' => $background,
                'borderColor' => $color,
                'pointBackgroundColor' => $color,
                'pointBorderColor' => '#fff',
                'pointHoverBackgroundColor' => '#fff',
                'pointHoverBorderColor' => $color,
                'pointRadius' => 6,
                'pointBorderWidth' => 3,
                'pointHoverRadius' => 10,
                'data' => $resultsArray,
            ];
            $counter++;
        }
        $resultsToJson = json_encode($dataSetToJson);

        return "
                <canvas id='categoryRadar' height='200'></canvas>
                <script>
                    var data = {
                        labels: $labels,
                        datasets: $resultsToJson
                    }
                    var options = {
                        responsive: true,
                        scale: {
                            angleLines: {
                                display: false
                            },
                            ticks: {
                                beginAtZero: true,
                                min: 0,
                                max: 10,
                                stepSize: 1,
                            },
                            pointLabels: {
                              fontSize: 14,
                              //fontStyle: 'bold'
                            },
                        },
                        elements: {
                            line: {
                                tension: 0,
                                borderWidth: 3
                            }
                        },
                        legend: {
                            //position: 'bottom'
                            display: $displayLegend
                        },
                        animation: {
                            animateScale: true,
                            animateRotate: true
                        },
                    };
                    var ctx = document.getElementById('categoryRadar').getContext('2d');
                    var myRadarChart = new Chart(ctx, {
                        type: 'radar',
                        data: data,
                        options: options
                    });
                </script>
                ";
    }

    /**
     * Returns a list of users based on the id of an exercise, the course and the session.
     * If the count is true, it returns only the number of users.
     *
     * @param int   $exerciseId
     * @param int   $courseId
     * @param int   $sessionId
     * @param false $count
     */
    public static function getUsersInExercise(
        $exerciseId = 0,
        $courseId = 0,
        $sessionId = 0,
        $count = false,
        $toUsers = [],
        $withSelectAll = true
    ) {
        $sessionId = empty($sessionId) ? api_get_session_id() : (int) $sessionId;
        $courseId = empty($courseId) ? api_get_course_id() : (int) $courseId;
        $exerciseId = (int) $exerciseId;
        if ((0 == $sessionId && 0 == $courseId) || 0 == $exerciseId) {
            return [];
        }
        $tblCourse = Database::get_main_table(TABLE_MAIN_COURSE);
        $tblCourseRelUser = Database::get_main_table(TABLE_MAIN_COURSE_USER);
        $tblSessionRelUser = Database::get_main_table(TABLE_MAIN_SESSION_COURSE_USER);

        $data = [];

        $tblQuiz = Database::get_course_table(TABLE_QUIZ_TEST);
        $countSelect = " COUNT(*) AS total ";
        $sqlToUsers = '';
        if (0 == $sessionId) {
            // Courses
            if (false === $count) {
                $countSelect = " cq.title AS quiz_title,
                    cq.iid AS quiz_id,
                    cru.c_id AS course_id,
                    cru.user_id AS user_id,
                    c.title AS title,
                    c.code AS 'code',
                    cq.active AS active,
                    cq.session_id AS session_id ";
            }

            $sql = "SELECT $countSelect
                FROM $tblCourseRelUser AS cru
                INNER JOIN $tblCourse AS c ON ( cru.c_id = c.id )
                INNER JOIN $tblQuiz AS cq ON ( cq.c_id = c.id )
                WHERE cru.is_tutor IS NULL
                    AND ( cq.session_id = 0 OR cq.session_id IS NULL)
                    AND cq.active != -1
                    AND cq.c_id = $courseId
                    AND cq.iid = $exerciseId ";
            if (!empty($toUsers)) {
                $sqlToUsers = ' AND cru.user_id IN ('.implode(',', $toUsers).') ';
            }
        } else {
            //Sessions
            if (false === $count) {
                $countSelect = " cq.title AS quiz_title,
                    cq.iid AS quiz_id,
                    sru.user_id AS user_id,
                    cq.c_id AS course_id,
                    sru.session_id AS session_id,
                    c.title AS title,
                    c.code AS 'code',
                    cq.active AS active ";
            }
            if (!empty($toUsers)) {
                $sqlToUsers = ' AND sru.user_id IN ('.implode(',', $toUsers).') ';
            }
            $sql = " SELECT $countSelect
                FROM $tblSessionRelUser AS sru
                    INNER JOIN $tblQuiz AS cq ON ( sru.session_id = sru.session_id )
                    INNER JOIN $tblCourse AS c ON ( c.id = cq.c_id )
                WHERE cq.active != 1
                  AND cq.c_id = $courseId
                  AND sru.session_id = $sessionId
                  AND cq.iid = $exerciseId ";
        }
        $sql .= " $sqlToUsers ORDER BY cq.c_id ";

        $result = Database::query($sql);
        $data = Database::store_result($result);
        Database::free_result($result);
        if (true === $count) {
            return (isset($data[0]) && isset($data[0]['total'])) ? $data[0]['total'] : 0;
        }
        $usersArray = [];

        $return = [];
        if ($withSelectAll) {
            $return[] = [
                'user_id' => 'X',
                'value' => 'X',
                'user_name' => get_lang('AllStudents'),
            ];
        }

        foreach ($data as $index => $item) {
            if (isset($item['user_id'])) {
                $userId = (int) $item['user_id'];
                if (!isset($usersArray[$userId])) {
                    $usersArray[$userId] = api_get_user_info($userId);
                }
                $usersArray[$userId]['user_id'] = $userId;
                $userData = $usersArray[$userId];
                $data[$index]['user_name'] = $userData['complete_name'];
                $return[] = $data[$index];
            }
        }

        return $return;
    }

    /**
     * Search the users who are in an exercise to send them an exercise reminder email and to the human resources
     * managers, it is necessary the exercise id, the course and the session if it exists.
     *
     * @param int $exerciseId
     * @param int $courseId
     * @param int $sessionId
     */
    public static function notifyUsersOfTheExercise(
        $exerciseId = 0,
        $courseId = 0,
        $sessionId = 0,
        $toUsers = []
    ) {
        $users = self::getUsersInExercise(
            $exerciseId,
            $courseId,
            $sessionId,
            false,
            $toUsers
        );
        $totalUsers = count($users);
        $usersArray = [];
        $courseTitle = '';
        $quizTitle = '';

        for ($i = 0; $i < $totalUsers; $i++) {
            $user = $users[$i];
            $userId = (int) $user['user_id'];
            if (0 != $userId) {
                $quizTitle = $user['quiz_title'];
                $courseTitle = $user['title'];
                if (!isset($usersArray[$userId])) {
                    $usersArray[$userId] = api_get_user_info($userId);
                }
            }
        }

        $objExerciseTmp = new Exercise();
        $objExerciseTmp->read($exerciseId);
        $isAddedInLp = !empty($objExerciseTmp->lpList);
        $end = $objExerciseTmp->end_time;
        $start = $objExerciseTmp->start_time;
        $minutes = $objExerciseTmp->expired_time;
        $formatDate = DATE_TIME_FORMAT_LONG;
        $tblCourseUser = Database::get_main_table(TABLE_MAIN_COURSE_USER);
        $tblSession = Database::get_main_table(TABLE_MAIN_SESSION);
        $tblSessionUser = Database::get_main_table(TABLE_MAIN_SESSION_USER);
        $tblSessionUserRelCourse = Database::get_main_table(TABLE_MAIN_SESSION_COURSE_USER);
        $teachersName = [];
        $teachersPrint = [];
        if (0 == $sessionId) {
            $sql = "SELECT course_user.user_id AS user_id
                FROM $tblCourseUser AS course_user
                WHERE course_user.status = 1 AND course_user.c_id ='".$courseId."'";
            $result = Database::query($sql);
            $data = Database::store_result($result);
            Database::free_result($result);
            foreach ($data as $teacher) {
                $teacherId = (int) $teacher['user_id'];
                if (!isset($teachersName[$teacherId])) {
                    $teachersName[$teacherId] = api_get_user_info($teacherId);
                }
                $teacherData = $teachersName[$teacherId];
                $teachersPrint[] = $teacherData['complete_name'];
            }
        } else {
            // general tutor
            $sql = "SELECT sesion.id_coach AS user_id
                FROM $tblSession AS sesion
                WHERE sesion.id = $sessionId";
            $result = Database::query($sql);
            $data = Database::store_result($result);
            Database::free_result($result);
            foreach ($data as $teacher) {
                $teacherId = (int) $teacher['user_id'];
                if (!isset($teachersName[$teacherId])) {
                    $teachersName[$teacherId] = api_get_user_info($teacherId);
                }
                $teacherData = $teachersName[$teacherId];
                $teachersPrint[] = $teacherData['complete_name'];
            }
            // Teacher into sessions course
            $sql = "SELECT session_rel_course_rel_user.user_id
                FROM $tblSessionUserRelCourse AS session_rel_course_rel_user
                WHERE session_rel_course_rel_user.session_id = $sessionId AND
                      session_rel_course_rel_user.c_id = $courseId AND
                      session_rel_course_rel_user.status = 2";
            $result = Database::query($sql);
            $data = Database::store_result($result);
            Database::free_result($result);
            foreach ($data as $teacher) {
                $teacherId = (int) $teacher['user_id'];
                if (!isset($teachersName[$teacherId])) {
                    $teachersName[$teacherId] = api_get_user_info($teacherId);
                }
                $teacherData = $teachersName[$teacherId];
                $teachersPrint[] = $teacherData['complete_name'];
            }
        }

        $teacherName = implode('<br>', $teachersPrint);

        if ($isAddedInLp) {
            $lpInfo = current($objExerciseTmp->lpList);
            $url = api_get_path(WEB_CODE_PATH)."lp/lp_controller.php?".api_get_cidreq().'&'
                .http_build_query(['action' => 'view', 'lp_id' => $lpInfo['lp_id']]);
        } else {
            $url = api_get_path(WEB_CODE_PATH)."exercise/overview.php?".api_get_cidreq()."&exerciseId=$exerciseId";
        }

        foreach ($usersArray as $userId => $userData) {
            $studentName = $userData['complete_name'];
            $title = sprintf(get_lang('QuizRemindSubject'), $teacherName);
            $content = sprintf(
                get_lang('QuizFirstRemindBody'),
                $studentName,
                $quizTitle,
                $courseTitle,
                $courseTitle,
                $quizTitle
            );
            if (!empty($minutes)) {
                $content .= sprintf(get_lang('QuizRemindDuration'), $minutes);
            }
            if (!empty($start)) {
                // api_get_utc_datetime
                $start = api_format_date(($start), $formatDate);

                $content .= sprintf(get_lang('QuizRemindStartDate'), $start);
            }
            if (!empty($end)) {
                $end = api_format_date(($end), $formatDate);
                $content .= sprintf(get_lang('QuizRemindEndDate'), $end);
            }
            $content .= sprintf(
                get_lang('QuizLastRemindBody'),
                $url,
                $url,
                $teacherName
            );
            $drhList = UserManager::getDrhListFromUser($userId);
            if (!empty($drhList)) {
                foreach ($drhList as $drhUser) {
                    $drhUserData = api_get_user_info($drhUser['id']);
                    $drhName = $drhUserData['complete_name'];
                    $contentDHR = sprintf(
                        get_lang('QuizDhrRemindBody'),
                        $drhName,
                        $studentName,
                        $quizTitle,
                        $courseTitle,
                        $studentName,
                        $courseTitle,
                        $quizTitle
                    );
                    if (!empty($minutes)) {
                        $contentDHR .= sprintf(get_lang('QuizRemindDuration'), $minutes);
                    }
                    if (!empty($start)) {
                        // api_get_utc_datetime
                        $start = api_format_date(($start), $formatDate);

                        $contentDHR .= sprintf(get_lang('QuizRemindStartDate'), $start);
                    }
                    if (!empty($end)) {
                        $end = api_format_date(($end), $formatDate);
                        $contentDHR .= sprintf(get_lang('QuizRemindEndDate'), $end);
                    }
                    MessageManager::send_message(
                        $drhUser['id'],
                        $title,
                        $contentDHR
                    );
                }
            }
            MessageManager::send_message(
                $userData['id'],
                $title,
                $content
            );
        }

        return $usersArray;
    }

    /**
     * Returns true if the exercise is locked by percentage. an exercise attempt must be passed.
     */
    public function isBlockedByPercentage(array $attempt = []): bool
    {
        if (empty($attempt)) {
            return false;
        }
        $extraFieldValue = new ExtraFieldValue('exercise');
        $blockExercise = $extraFieldValue->get_values_by_handler_and_field_variable(
            $this->iid,
            'blocking_percentage'
        );

        if (empty($blockExercise['value'])) {
            return false;
        }

        $blockPercentage = (int) $blockExercise['value'];

        if (0 === $blockPercentage) {
            return false;
        }

        $resultPercentage = 0;

        if (isset($attempt['exe_result']) && isset($attempt['exe_weighting'])) {
            $weight = (int) $attempt['exe_weighting'];
            $weight = (0 == $weight) ? 1 : $weight;
            $resultPercentage = float_format(
                ($attempt['exe_result'] / $weight) * 100,
                1
            );
        }
        if ($resultPercentage <= $blockPercentage) {
            return true;
        }

        return false;
    }

    /**
     * Gets the question list ordered by the question_order setting (drag and drop).
     *
     * @param bool $adminView Optional.
     *
     * @return array
     */
    public function getQuestionOrderedList($adminView = false)
    {
        $TBL_QUIZ_QUESTION = Database::get_course_table(TABLE_QUIZ_TEST_QUESTION);
        $TBL_QUESTIONS = Database::get_course_table(TABLE_QUIZ_QUESTION);

        // Getting question_order to verify that the question
        // list is correct and all question_order's were set
        $sql = "SELECT DISTINCT count(e.question_order) as count
                FROM $TBL_QUIZ_QUESTION e
                INNER JOIN $TBL_QUESTIONS q
                ON e.question_id = q.iid
                WHERE
                  e.c_id = {$this->course_id} AND
                  e.exercice_id	= ".$this->iid;

        $result = Database::query($sql);
        $row = Database::fetch_array($result);
        $count_question_orders = $row['count'];

        // Getting question list from the order (question list drag n drop interface).
        $sql = "SELECT DISTINCT e.question_id, e.question_order
                FROM $TBL_QUIZ_QUESTION e
                INNER JOIN $TBL_QUESTIONS q
                ON e.question_id = q.iid
                WHERE
                    e.c_id = {$this->course_id} AND
                    e.exercice_id = '".$this->iid."'
                ORDER BY question_order";
        $result = Database::query($sql);

        // Fills the array with the question ID for this exercise
        // the key of the array is the question position
        $temp_question_list = [];
        $counter = 1;
        $questionList = [];
        while ($new_object = Database::fetch_object($result)) {
            if (!$adminView) {
                // Correct order.
                $questionList[$new_object->question_order] = $new_object->question_id;
            } else {
                $questionList[$counter] = $new_object->question_id;
            }

            // Just in case we save the order in other array
            $temp_question_list[$counter] = $new_object->question_id;
            $counter++;
        }

        if (!empty($temp_question_list)) {
            /* If both array don't match it means that question_order was not correctly set
               for all questions using the default mysql order */
            if (count($temp_question_list) != $count_question_orders || count($temp_question_list) !== count($questionList)) {
                $questionList = $temp_question_list;
            }
        }

        return $questionList;
    }

    /**
     * Returns a literal for the given numerical feedback type (usually
     * coming from the DB or a constant). The literal is also the string
     * used to get the translation, not the translation itself as it is
     * more vulnerable to changes.
     */
    public static function getFeedbackTypeLiteral(int $feedbackType): string
    {
        $feedbackType = (int) $feedbackType;
        $result = '';
        static $arrayFeedbackTypes = [
            EXERCISE_FEEDBACK_TYPE_END => 'ExerciseAtTheEndOfTheTest',
            EXERCISE_FEEDBACK_TYPE_DIRECT => 'DirectFeedback',
            EXERCISE_FEEDBACK_TYPE_EXAM => 'NoFeedback',
            EXERCISE_FEEDBACK_TYPE_POPUP => 'ExerciseDirectPopUp',
        ];

        if (array_key_exists($feedbackType, $arrayFeedbackTypes)) {
            $result = $arrayFeedbackTypes[$feedbackType];
        }

        return $result;
    }

    /**
     * Return the text to display, based on the score and the max score.
     *
     * @param int|float $score
     * @param int|float $maxScore
     */
    public function getFinishText($score, $maxScore): string
    {
        if (true !== api_get_configuration_value('exercise_text_when_finished_failure')) {
            return $this->getTextWhenFinished();
        }

        $passPercentage = $this->selectPassPercentage();

        if (!empty($passPercentage)) {
            $percentage = float_format(
                ($score / (0 != $maxScore ? $maxScore : 1)) * 100,
                1
            );

            if ($percentage < $passPercentage) {
                return $this->getTextWhenFinishedFailure();
            }
        }

        return $this->getTextWhenFinished();
    }

    /**
     * Get number of questions in exercise by user attempt.
     *
     * @return int
     */
    private function countQuestionsInExercise()
    {
        $lpId = isset($_REQUEST['learnpath_id']) ? (int) $_REQUEST['learnpath_id'] : 0;
        $lpItemId = isset($_REQUEST['learnpath_item_id']) ? (int) $_REQUEST['learnpath_item_id'] : 0;
        $lpItemViewId = isset($_REQUEST['learnpath_item_view_id']) ? (int) $_REQUEST['learnpath_item_view_id'] : 0;

        $trackInfo = $this->get_stat_track_exercise_info($lpId, $lpItemId, $lpItemViewId);

        if (!empty($trackInfo)) {
            $questionIds = explode(',', $trackInfo['data_tracking']);

            return count($questionIds);
        }

        return $this->getQuestionCount();
    }

    /**
     * Select N values from the questions per category array.
     *
     * @param array $categoriesAddedInExercise
     * @param array $question_list
     * @param array $questions_by_category
     * @param bool  $flatResult
     * @param bool  $randomizeQuestions
     * @param array $questionsByCategoryMandatory
     *
     * @return array
     */
    private function pickQuestionsPerCategory(
        $categoriesAddedInExercise,
        $question_list,
        &$questions_by_category,
        $flatResult = true,
        $randomizeQuestions = false,
        $questionsByCategoryMandatory = []
    ) {
        $addAll = true;
        $categoryCountArray = [];

        // Getting how many questions will be selected per category.
        if (!empty($categoriesAddedInExercise)) {
            $addAll = false;
            // Parsing question according the category rel exercise settings
            foreach ($categoriesAddedInExercise as $category_info) {
                $category_id = $category_info['category_id'];
                if (isset($questions_by_category[$category_id])) {
                    // How many question will be picked from this category.
                    $count = $category_info['count_questions'];
                    // -1 means all questions
                    $categoryCountArray[$category_id] = $count;
                    if (-1 == $count) {
                        $categoryCountArray[$category_id] = 999;
                    }
                }
            }
        }

        if (!empty($questions_by_category)) {
            $temp_question_list = [];
            foreach ($questions_by_category as $category_id => &$categoryQuestionList) {
                if (isset($categoryCountArray) && !empty($categoryCountArray)) {
                    $numberOfQuestions = 0;
                    if (isset($categoryCountArray[$category_id])) {
                        $numberOfQuestions = $categoryCountArray[$category_id];
                    }
                }

                if ($addAll) {
                    $numberOfQuestions = 999;
                }
                if (!empty($numberOfQuestions)) {
                    $mandatoryQuestions = [];
                    if (isset($questionsByCategoryMandatory[$category_id])) {
                        $mandatoryQuestions = $questionsByCategoryMandatory[$category_id];
                    }

                    $elements = TestCategory::getNElementsFromArray(
                        $categoryQuestionList,
                        $numberOfQuestions,
                        $randomizeQuestions,
                        $mandatoryQuestions
                    );
                    if (!empty($elements)) {
                        $temp_question_list[$category_id] = $elements;
                        $categoryQuestionList = $elements;
                    }
                }
            }

            if (!empty($temp_question_list)) {
                if ($flatResult) {
                    $temp_question_list = array_flatten($temp_question_list);
                }
                $question_list = $temp_question_list;
            }
        }

        return $question_list;
    }

    /**
     * Changes the exercise id.
     *
     * @param int $id - exercise id
     */
    private function updateId($id)
    {
        $this->iid = $id;
    }

    /**
     * Sends a notification when a user ends an examn.
     *
     * @param array  $question_list_answers
     * @param string $origin
     * @param array  $user_info
     * @param string $url_email
     * @param array  $teachers
     */
    private function sendNotificationForOpenQuestions(
        $question_list_answers,
        $origin,
        $user_info,
        $url_email,
        $teachers
    ) {
        // Email configuration settings
        $courseCode = api_get_course_id();
        $courseInfo = api_get_course_info($courseCode);
        $sessionId = api_get_session_id();
        $sessionData = '';
        if (!empty($sessionId)) {
            $sessionInfo = api_get_session_info($sessionId);
            if (!empty($sessionInfo)) {
                $sessionData = '<tr>'
                    .'<td><em>'.get_lang('SessionName').'</em></td>'
                    .'<td>&nbsp;<b>'.$sessionInfo['name'].'</b></td>'
                    .'</tr>';
            }
        }

        $msg = get_lang('OpenQuestionsAttempted').'<br /><br />'
            .get_lang('AttemptDetails').' : <br /><br />'
            .'<table>'
            .'<tr>'
            .'<td><em>'.get_lang('CourseName').'</em></td>'
            .'<td>&nbsp;<b>#course#</b></td>'
            .'</tr>'
            .$sessionData
            .'<tr>'
            .'<td>'.get_lang('TestAttempted').'</td>'
            .'<td>&nbsp;#exercise#</td>'
            .'</tr>'
            .'<tr>'
            .'<td>'.get_lang('StudentName').'</td>'
            .'<td>&nbsp;#firstName# #lastName#</td>'
            .'</tr>'
            .'<tr>'
            .'<td>'.get_lang('StudentEmail').'</td>'
            .'<td>&nbsp;#mail#</td>'
            .'</tr>'
            .'</table>';

        $open_question_list = null;
        foreach ($question_list_answers as $item) {
            $question = $item['question'];
            $answer = $item['answer'];
            $answer_type = $item['answer_type'];
            if (!empty($question) && !empty($answer) && $answer_type == FREE_ANSWER) {
                $open_question_list .=
                    '<tr>'
                    .'<td width="220" valign="top" bgcolor="#E5EDF8">&nbsp;&nbsp;'.get_lang('Question').'</td>'
                    .'<td width="473" valign="top" bgcolor="#F3F3F3">'.$question.'</td>'
                    .'</tr>'
                    .'<tr>'
                    .'<td width="220" valign="top" bgcolor="#E5EDF8">&nbsp;&nbsp;'.get_lang('Answer').'</td>'
                    .'<td valign="top" bgcolor="#F3F3F3">'.$answer.'</td>'
                    .'</tr>';
            }
        }

        if (!empty($open_question_list)) {
            $msg .= '<p><br />'.get_lang('OpenQuestionsAttemptedAre').' :</p>'.
                '<table width="730" height="136" border="0" cellpadding="3" cellspacing="3">';
            $msg .= $open_question_list;
            $msg .= '</table><br />';

            $msg = str_replace('#exercise#', $this->exercise, $msg);
            $msg = str_replace('#firstName#', $user_info['firstname'], $msg);
            $msg = str_replace('#lastName#', $user_info['lastname'], $msg);
            $msg = str_replace('#mail#', $user_info['email'], $msg);
            $msg = str_replace(
                '#course#',
                Display::url($courseInfo['title'], $courseInfo['course_public_url'].'?id_session='.$sessionId),
                $msg
            );

            if ($origin != 'learnpath') {
                $msg .= '<br /><a href="#url#">'.get_lang('ClickToCommentAndGiveFeedback').'</a>';
            }
            $msg = str_replace('#url#', $url_email, $msg);
            $subject = get_lang('OpenQuestionsAttempted');

            if (!empty($teachers)) {
                foreach ($teachers as $user_id => $teacher_data) {
                    MessageManager::send_message_simple(
                        $user_id,
                        $subject,
                        $msg
                    );
                }
            }
        }
    }

    /**
     * Send notification for oral questions.
     *
     * @param array  $question_list_answers
     * @param string $origin
     * @param int    $exe_id
     * @param array  $user_info
     * @param string $url_email
     * @param array  $teachers
     */
    private function sendNotificationForOralQuestions(
        $question_list_answers,
        $origin,
        $exe_id,
        $user_info,
        $url_email,
        $teachers
    ) {
        // Email configuration settings
        $courseCode = api_get_course_id();
        $courseInfo = api_get_course_info($courseCode);
        $oral_question_list = null;
        foreach ($question_list_answers as $item) {
            $question = $item['question'];
            $file = $item['generated_oral_file'];
            $answer = $item['answer'];
            if (0 == $answer) {
                $answer = '';
            }
            $answer_type = $item['answer_type'];
            if (!empty($question) && (!empty($answer) || !empty($file)) && $answer_type == ORAL_EXPRESSION) {
                if (!empty($file)) {
                    $file = Display::url($file, $file);
                }
                $oral_question_list .= '<br />
                    <table width="730" height="136" border="0" cellpadding="3" cellspacing="3">
                    <tr>
                        <td width="220" valign="top" bgcolor="#E5EDF8">&nbsp;&nbsp;'.get_lang('Question').'</td>
                        <td width="473" valign="top" bgcolor="#F3F3F3">'.$question.'</td>
                    </tr>
                    <tr>
                        <td width="220" valign="top" bgcolor="#E5EDF8">&nbsp;&nbsp;'.get_lang('Answer').'</td>
                        <td valign="top" bgcolor="#F3F3F3">'.$answer.$file.'</td>
                    </tr></table>';
            }
        }

        if (!empty($oral_question_list)) {
            $msg = get_lang('OralQuestionsAttempted').'<br /><br />
                    '.get_lang('AttemptDetails').' : <br /><br />
                    <table>
                        <tr>
                            <td><em>'.get_lang('CourseName').'</em></td>
                            <td>&nbsp;<b>#course#</b></td>
                        </tr>
                        <tr>
                            <td>'.get_lang('TestAttempted').'</td>
                            <td>&nbsp;#exercise#</td>
                        </tr>
                        <tr>
                            <td>'.get_lang('StudentName').'</td>
                            <td>&nbsp;#firstName# #lastName#</td>
                        </tr>
                        <tr>
                            <td>'.get_lang('StudentEmail').'</td>
                            <td>&nbsp;#mail#</td>
                        </tr>
                    </table>';
            $msg .= '<br />'.sprintf(get_lang('OralQuestionsAttemptedAreX'), $oral_question_list).'<br />';
            $msg1 = str_replace("#exercise#", $this->exercise, $msg);
            $msg = str_replace("#firstName#", $user_info['firstname'], $msg1);
            $msg1 = str_replace("#lastName#", $user_info['lastname'], $msg);
            $msg = str_replace("#mail#", $user_info['email'], $msg1);
            $msg = str_replace("#course#", $courseInfo['name'], $msg1);

            if (!in_array($origin, ['learnpath', 'embeddable', 'iframe'])) {
                $msg .= '<br /><a href="#url#">'.get_lang('ClickToCommentAndGiveFeedback').'</a>';
            }
            $msg1 = str_replace("#url#", $url_email, $msg);
            $mail_content = $msg1;
            $subject = get_lang('OralQuestionsAttempted');

            if (!empty($teachers)) {
                foreach ($teachers as $user_id => $teacher_data) {
                    MessageManager::send_message_simple(
                        $user_id,
                        $subject,
                        $mail_content
                    );
                }
            }
        }
    }

    /**
     * Returns an array with the media list.
     *
     * @param array question list
     *
     * @example there's 1 question with iid 5 that belongs to the media question with iid = 100
     * <code>
     * array (size=2)
     *  999 =>
     *    array (size=3)
     *      0 => int 7
     *      1 => int 6
     *      2 => int 3254
     *  100 =>
     *   array (size=1)
     *      0 => int 5
     *  </code>
     */
    private function setMediaList($questionList)
    {
        $mediaList = [];
        /*
         * Media feature is not activated in 1.11.x
        if (!empty($questionList)) {
            foreach ($questionList as $questionId) {
                $objQuestionTmp = Question::read($questionId, $this->course_id);
                // If a media question exists
                if (isset($objQuestionTmp->parent_id) && $objQuestionTmp->parent_id != 0) {
                    $mediaList[$objQuestionTmp->parent_id][] = $objQuestionTmp->iid;
                } else {
                    // Always the last item
                    $mediaList[999][] = $objQuestionTmp->iid;
                }
            }
        }*/

        $this->mediaList = $mediaList;
    }

    /**
     * Returns the part of the form for the disabled results option.
     *
     * @return HTML_QuickForm_group
     */
    private function setResultDisabledGroup(FormValidator $form)
    {
        $resultDisabledGroup = [];

        $resultDisabledGroup[] = $form->createElement(
            'radio',
            'results_disabled',
            null,
            get_lang('ShowScoreAndRightAnswer'),
            RESULT_DISABLE_SHOW_SCORE_AND_EXPECTED_ANSWERS,
            ['id' => 'result_disabled_0']
        );

        $warning = sprintf(
            get_lang('TheSettingXWillChangeToX'),
            get_lang('FeedbackType'),
            get_lang('NoFeedback')
        );

        $resultDisabledGroup[] = $form->createElement(
            'radio',
            'results_disabled',
            null,
            get_lang('DoNotShowScoreNorRightAnswer'),
            RESULT_DISABLE_NO_SCORE_AND_EXPECTED_ANSWERS,
            [
                'id' => 'result_disabled_1',
                //'onclick' => 'check_results_disabled()'
                'onclick' => 'javascript:if(confirm('."'".addslashes($warning)."'".')) { check_results_disabled(); } else { return false;} ',
            ]
        );

        $resultDisabledGroup[] = $form->createElement(
            'radio',
            'results_disabled',
            null,
            get_lang('OnlyShowScore'),
            RESULT_DISABLE_SHOW_SCORE_ONLY,
            [
                'id' => 'result_disabled_2',
                //'onclick' => 'check_results_disabled()'
                'onclick' => 'javascript:if(confirm('."'".addslashes($warning)."'".')) { check_results_disabled(); } else { return false;} ',
            ]
        );

        if (in_array($this->getFeedbackType(), [EXERCISE_FEEDBACK_TYPE_DIRECT, EXERCISE_FEEDBACK_TYPE_POPUP])) {
            return $form->addGroup(
                $resultDisabledGroup,
                null,
                get_lang('ShowResultsToStudents')
            );
        }

        $resultDisabledGroup[] = $form->createElement(
            'radio',
            'results_disabled',
            null,
            get_lang('ShowScoreEveryAttemptShowAnswersLastAttempt'),
            RESULT_DISABLE_SHOW_SCORE_ATTEMPT_SHOW_ANSWERS_LAST_ATTEMPT,
            ['id' => 'result_disabled_4']
        );

        $resultDisabledGroup[] = $form->createElement(
            'radio',
            'results_disabled',
            null,
            get_lang('DontShowScoreOnlyWhenUserFinishesAllAttemptsButShowFeedbackEachAttempt'),
            RESULT_DISABLE_DONT_SHOW_SCORE_ONLY_IF_USER_FINISHES_ATTEMPTS_SHOW_ALWAYS_FEEDBACK,
            [
                'id' => 'result_disabled_5',
                //'onclick' => 'check_results_disabled()'
                'onclick' => 'javascript:if(confirm('."'".addslashes($warning)."'".')) { check_results_disabled(); } else { return false;} ',
            ]
        );

        $resultDisabledGroup[] = $form->createElement(
            'radio',
            'results_disabled',
            null,
            get_lang('ExerciseRankingMode'),
            RESULT_DISABLE_RANKING,
            ['id' => 'result_disabled_6']
        );

        $resultDisabledGroup[] = $form->createElement(
            'radio',
            'results_disabled',
            null,
            get_lang('ExerciseShowOnlyGlobalScoreAndCorrectAnswers'),
            RESULT_DISABLE_SHOW_ONLY_IN_CORRECT_ANSWER,
            ['id' => 'result_disabled_7']
        );

        $resultDisabledGroup[] = $form->createElement(
            'radio',
            'results_disabled',
            null,
            get_lang('ExerciseAutoEvaluationAndRankingMode'),
            RESULT_DISABLE_SHOW_SCORE_AND_EXPECTED_ANSWERS_AND_RANKING,
            ['id' => 'result_disabled_8']
        );

        $resultDisabledGroup[] = $form->createElement(
            'radio',
            'results_disabled',
            null,
            get_lang('ExerciseCategoriesRadarMode'),
            RESULT_DISABLE_RADAR,
            ['id' => 'result_disabled_9']
        );

        $resultDisabledGroup[] = $form->createElement(
            'radio',
            'results_disabled',
            null,
            get_lang('ShowScoreEveryAttemptShowAnswersLastAttemptNoFeedback'),
            RESULT_DISABLE_SHOW_SCORE_ATTEMPT_SHOW_ANSWERS_LAST_ATTEMPT_NO_FEEDBACK,
            ['id' => 'result_disabled_10']
        );

        return $form->addGroup(
            $resultDisabledGroup,
            null,
            get_lang('ShowResultsToStudents')
        );
    }
}