woothemes / sensei

includes/class-sensei.php

<?php

For compatibility and reusability of your code, PSR1 recommends that a file should introduce either new symbols (like classes, functions, etc.) or have side-effects (like outputting something, or including other files), but not both at the same time. The first symbol is defined on line 11 and the first side effect is on line 2.

if ( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly

/**
 * Responsible for loading Sensei and setting up the Main WordPress hooks.
 *
 * @package Core
 * @author Automattic
 * @since 1.0.0
 */
class Sensei_Main {

    /**
     * @var string
     * Reference to the main plugin file
     */
    private $file;

    /**
     * @var Sensei_Main $_instance to the the main and only instance of the Sensei class.
     * @since 1.8.0
     */
    protected static $_instance = null;

    /**
     * Main reference to the plugins current version
     */
    public $version;

    /**
     * Public token, referencing for the text domain.
     */
    public $token = 'woothemes-sensei';

    /**
     * Plugin url and path for use when access resources.
     */
    public $plugin_url;
    public $plugin_path;
    public $template_url;

    /**
     * @var Sensei_PostTypes
     * All Sensei sub classes. Currently used to access functionality contained within
     * within Sensei sub classes e.g. Sensei()->course->all_courses()
     */
    public $post_types;

    /**
     * @var WooThemes_Sensei_Settings
     */
    public $settings;

    /**
     * @var WooThemes_Sensei_Course_Results
     */
    public $course_results;

    /**
     * @var Sensei_Updates
     */
    public $updates;
    /**
     * @var WooThemes_Sensei_Course
     */
    public $course;

    /**
     * @var WooThemes_Sensei_Lesson
     */
    public $lesson;

    /**
     * @var WooThemes_Sensei_Quiz
     */
    public $quiz;

    /**
     * @var WooThemes_Sensei_Question
     */
    public $question;

    /**
     * @var WooThemes_Sensei_Admin
     */
    public $admin;

    /**
     * @var WooThemes_Sensei_Frontend
     */
    public $frontend;

    /**
     * @var Sensei_Notices
     */
    public $notices;

    /**
     * @var WooThemes_Sensei_Grading
     */
    public $grading;

    /**
     * @var WooThemes_Sensei_Emails
     */
    public $emails;

    /**
     * @var WooThemes_Sensei_Learner_Profiles
     */
    public $learner_profiles;

    /**
     * @var Sensei_Teacher
     */
    public $teacher;

    /**
     * @var WooThemes_Sensei_Learners
     */
    public $learners;

    /**
     * @var array
     * Global instance for access to the permissions message shown
     * when users do not have the right privileges to access resources.
     */
    public $permissions_message;

    /**
     * @var Sensei_Core_Modules Sensei Modules functionality
     */
    public $modules;

    /**
     * @var Sensei_Analysis
     */
    public $analysis;

    /**
     * Constructor method.
     * @param  string $file The base file of the plugin.
     * @since  1.0.0
     */
    public function __construct ( $file ) {

        // Setup object data
        $this->file = $file;
        $this->plugin_url = trailingslashit( plugins_url( '', $plugin = $file ) );
        $this->plugin_path = trailingslashit( dirname( $file ) );
        $this->template_url	= apply_filters( 'sensei_template_url', 'sensei/' );

        // Initialize the core Sensei functionality
        $this->init();

        // Installation
        if ( is_admin() && ! defined( 'DOING_AJAX' ) ) $this->install();

        // Run this on activation.
        register_activation_hook( $this->file, array( $this, 'activation' ) );

        // Image Sizes
        $this->init_image_sizes();

        // load all hooks
        $this->load_hooks();

    } // End __construct()

    /**
     * Load the foundations of Sensei.
     * @since 1.9.0
     */
    protected function init(){

        // Localisation
        $this->load_plugin_textdomain();
        add_action( 'init', array( $this, 'load_localisation' ), 0 );

        // Setup settings
        $this->settings = new Sensei_Settings();

        // load the shortcode loader into memory, so as to listen to all for
        // all shortcodes on the front end
        new Sensei_Shortcode_Loader();

    }

    /**
     * Global Sensei Instance
     *
     * Ensure that only one instance of the main Sensei class can be loaded.
     *
     * @since 1.8.0
     * @static
     * @see WC()
     * @return WooThemes_Sensei Instance.
     */
    public static function instance() {

        if ( is_null( self::$_instance ) ) {

            //Sensei requires a reference to the main Sensei plugin file
            $sensei_main_plugin_file = dirname ( dirname( __FILE__ ) ) . '/woothemes-sensei.php';

            self::$_instance = new self( $sensei_main_plugin_file  );

            // load the global class objects needed throughout Sensei
            self::$_instance->initialize_global_objects();

        }

        return self::$_instance;

    } // end instance()

    /**
     * This function is linked into the activation
     * hook to reset flush the urls to ensure Sensei post types show up.
     *
     * @since 1.9.0
     *
     * @param $plugin
     */
    public static function activation_flush_rules( $plugin ){

        if( strpos( $plugin, '/woothemes-sensei.php' ) > 0  ){

            flush_rewrite_rules(true);

        }

    }

    /**
     * Cloning is forbidden.
     * @since 1.8.0
     */
    public function __clone() {
        _doing_it_wrong( __FUNCTION__, __( 'Cheatin’ huh?', 'woothemes-sensei' ), '1.8' );
    }

    /**
     * Unserializing instances of this class is forbidden.
     * @since 1.8.0
     */
    public function __wakeup() {
        _doing_it_wrong( __FUNCTION__, __( 'Cheatin’ huh?', 'woothemes-sensei' ), '1.8' );
    }

    /**
     * Load the properties for the main Sensei object
     *
     * @since 1.9.0
     */
    public function initialize_global_objects(){

        // Setup post types.
        $this->post_types = new Sensei_PostTypes();

        // Lad the updates class
        $this->updates = new Sensei_Updates( $this );

        // Load Course Results Class
        $this->course_results = new Sensei_Course_Results();

        // Load the teacher role
        $this->teacher = new Sensei_Teacher();

        // Add the Course class
        $this->course = $this->post_types->course;

        // Add the lesson class
        $this->lesson = $this->post_types->lesson;

        // Add the question class
        $this->question = $this->post_types->question;

        //Add the quiz class
        $this->quiz = $this->post_types->quiz;

        // load the modules class after all plugsin are loaded
	    $this->load_modules_class();

        // Load Learner Management Functionality
        $this->learners = new Sensei_Learner_Management( $this->file );

        // Differentiate between administration and frontend logic.
        if ( is_admin() ) {

            // Load Admin Welcome class
            new Sensei_Welcome();

            // Load Admin Class
            $this->admin = new Sensei_Admin( $this->file );

            // Load Analysis Reports
            $this->analysis = new Sensei_Analysis( $this->file );

        } else {

            // Load Frontend Class
            $this->frontend = new Sensei_Frontend();

            // Load notice Class
            $this->notices = new Sensei_Notices();

            // Load built in themes support integration
            new Sensei_Theme_Integration_Loader();


        }

        // Load Grading Functionality
        $this->grading = new Sensei_Grading( $this->file );

        // Load Email Class
        $this->emails = new Sensei_Emails( $this->file );

        // Load Learner Profiles Class
        $this->learner_profiles = new Sensei_Learner_Profiles();

    }

    /**
     * Initialize all Sensei hooks
     *
     * @since 1.9.0
     */
    public function load_hooks(){

        add_action( 'widgets_init', array( $this, 'register_widgets' ) );
        add_action( 'after_setup_theme', array( $this, 'ensure_post_thumbnails_support' ) );

        // Filter comment counts
        add_filter( 'wp_count_comments', array( $this, 'sensei_count_comments' ), 10, 2 );

        add_action( 'body_class', array( $this, 'body_class' ) );

        // Check for and activate JetPack LaTeX support
        add_action( 'plugins_loaded', array( $this, 'jetpack_latex_support'), 200 ); // Runs after Jetpack has loaded it's modules

        // check flush the rewrite rules if the option sensei_flush_rewrite_rules option is 1
        add_action( 'init', array( $this, 'flush_rewrite_rules'), 101 );

    }

    /**
     * Run Sensei updates.
     * @access  public
     * @since   1.1.0
     * @return  void
     */
    public function run_updates() {
        // Run updates if administrator
        if ( current_user_can( 'manage_options' ) || current_user_can( 'manage_sensei' ) ) {

            $this->updates->update();

        } // End If Statement
    } // End run_updates()

    /**
     * Register the widgets.
     * @access public
     * @since  1.0.0
     * @return void
     */
    public function register_widgets () {
        // Widget List (key => value is filename => widget class).
        $widget_list = apply_filters( 'sensei_registered_widgets_list', array( 	'course-component' 	=> 'Course_Component',
                'lesson-component' 	=> 'Lesson_Component',
                'course-categories' => 'Course_Categories',
                'category-courses' 	=> 'Category_Courses' )
        );
        foreach ( $widget_list as $key => $value ) {
            if ( file_exists( $this->plugin_path . 'widgets/widget-woothemes-sensei-' . $key  . '.php' ) ) {
                require_once( $this->plugin_path . 'widgets/widget-woothemes-sensei-' . $key  . '.php' );
                register_widget( 'WooThemes_Sensei_' . $value . '_Widget' );
            }
        } // End For Loop

        do_action( 'sensei_register_widgets' );

    } // End register_widgets()

    /**
     * Load the plugin's localisation file.
     * @access public
     * @since  1.0.0
     * @return void
     */
    public function load_localisation () {

        load_plugin_textdomain( 'woothemes-sensei', false, dirname( plugin_basename( $this->file ) ) . '/lang/' );

    } // End load_localisation()

    /**
     * Load the plugin textdomain from the main WordPress "languages" folder.
     * @access  public
     * @since   1.0.0
     * @return  void
     */
    public function load_plugin_textdomain () {

        $domain = 'woothemes-sensei';
        // The "plugin_locale" filter is also used in load_plugin_textdomain()
        $locale = apply_filters( 'plugin_locale', get_locale(), $domain );
        load_textdomain( $domain, WP_LANG_DIR . '/' . $domain . '/' . $domain . '-' . $locale . '.mo' );
        load_plugin_textdomain( $domain, FALSE, dirname( plugin_basename( $this->file ) ) . '/lang/' );

    } // End load_plugin_textdomain()

    /**
     * Run on activation.
     * @access public
     * @since  1.0.0
     * @return void
     */
    public function activation () {

        $this->register_plugin_version();

    } // End activation()


    /**
     * Register activation hooks.
     * @access public
     * @since  1.0.0
     * @return void
     */
    public function install () {

        register_activation_hook( $this->file, array( $this, 'activate_sensei' ) );
        register_activation_hook( $this->file, 'flush_rewrite_rules' );

    } // End install()


    /**
     * Run on activation of the plugin.
     * @access public
     * @since  1.0.0
     * @return void
     */
    public function activate_sensei () {

        update_option( 'skip_install_sensei_pages', 0 );
        update_option( 'sensei_installed', 1 );

    } // End activate_sensei()

    /**
     * Register the plugin's version.
     * @access public
     * @since  1.0.0
     * @return void
     */
    private function register_plugin_version () {
        if ( $this->version != '' ) {

            update_option( 'woothemes-sensei-version', $this->version );

        }
    } // End register_plugin_version()

    /**
     * Ensure that "post-thumbnails" support is available for those themes that don't register it.
     * @access  public
     * @since   1.0.1
     * @return  void
     */
    public function ensure_post_thumbnails_support () {

        if ( ! current_theme_supports( 'post-thumbnails' ) ) { add_theme_support( 'post-thumbnails' ); }

    } // End ensure_post_thumbnails_support()

    /**
     * template_loader function.
     *
     * @access public
     * @param mixed $template
     * @return void
     * @deprecated
     */
    public function template_loader ( $template = '' ) {

        _deprecated_function( 'Sensei()->template_loader', '1.9.0', 'Use Sensei_Templates::template_loader( $template ) instead' );
        Sensei_Templates::template_loader( $template );

    } // End template_loader()

    /**
     * Determine the relative path to the plugin's directory.
     * @access public
     * @since  1.0.0
     * @return string $sensei_plugin_path
     */
    public function plugin_path () {

        if ( $this->plugin_path ) {

            $sensei_plugin_path =  $this->plugin_path;

        }else{

            $sensei_plugin_path = plugin_dir_path( __FILE__ );

        }

        return $sensei_plugin_path;

    } // End plugin_path()

    /**
     * Retrieve the ID of a specified page setting.
     * @access public
     * @since  1.0.0
     * @param  string $page
     * @return int
     */
    public function get_page_id ( $page ) {
        $page = apply_filters( 'sensei_get_' . esc_attr( $page ) . '_page_id', get_option( 'sensei_' . esc_attr( $page ) . '_page_id' ) );
        return ( $page ) ? $page : -1;
    } // End get_page_id()

    /**
     * check_user_permissions function.
     *
     * @access public
     * @param string $page (default: '')
     *
     * @return bool
     */
    public function check_user_permissions ( $page = '' ) {

        global $current_user, $post;

        $user_allowed = false;

        switch ( $page ) {
	        case 'course-single':
		        // check for prerequisite course or lesson,
		        $course_prerequisite_id = (int) get_post_meta( $post->ID, '_course_prerequisite', true );
		        $update_course          = Sensei_WC::course_update( $post->ID );

		        // Count completed lessons
		        if ( 0 < absint( $course_prerequisite_id ) ) {

			        $prerequisite_complete = Sensei_Utils::user_completed_course( $course_prerequisite_id, $current_user->ID );

		        } else {
			        $prerequisite_complete = true;
		        } // End If Statement

		        // Handles restrictions on the course
		        if ( ( ! $prerequisite_complete && 0 < absint( $course_prerequisite_id ) ) ) {

			        $user_allowed = false;
			        $course_link  = '<a href="' . esc_url( get_permalink( $course_prerequisite_id ) ) . '">' . __( 'course', 'woothemes-sensei' ) . '</a>';
			        $this->notices->add_notice( sprintf( __( 'Please complete the previous %1$s before taking this course.', 'woothemes-sensei' ), $course_link ), 'info' );

		        } elseif( Sensei_WC::is_woocommerce_active() && Sensei_WC::is_course_purchasable( $post->ID ) && ! Sensei_Utils::user_started_course( $post->ID, $current_user->ID )  ) {

			        $message = sprintf( __( 'Or %1$s login %2$s to access your purchased courses', 'woothemes-sensei' ), '<a href="'.sensei_user_login_url().'">', '</a>' );
			        $this->notices->add_notice( $message, 'info' );


		        } elseif ( ! Sensei_Utils::user_started_course( $post->ID, $current_user->ID )  ) {

					// users who haven't started the course are allowed to view it
			        $user_allowed                         = true;



		        } else  {

                    $user_allowed = true;

                } // End If Statement
                break;
            case 'lesson-single':
                // Check for WC purchase
                $lesson_course_id = get_post_meta( $post->ID, '_lesson_course',true );

                $update_course = Sensei_WC::course_update( $lesson_course_id );
                $is_preview = Sensei_Utils::is_preview_lesson( $post->ID );

                if ( $this->access_settings() && Sensei_Utils::user_started_course( $lesson_course_id, $current_user->ID ) ) {
                    $user_allowed = true;
                } elseif( $this->access_settings() && false == $is_preview ) {

                    $user_allowed = true;

                } else {
                    $this->permissions_message['title'] = get_the_title( $post->ID ) . ': ' . __('Restricted Access', 'woothemes-sensei' );
                    $course_link = '<a href="' . esc_url( get_permalink( $lesson_course_id ) ) . '">' . __( 'course', 'woothemes-sensei' ) . '</a>';
                    $wc_post_id = get_post_meta( $lesson_course_id, '_course_woocommerce_product',true );
                    if ( Sensei_WC::is_woocommerce_active() && ( 0 < $wc_post_id ) ) {
                        if ( $is_preview ) {
                            $this->permissions_message['message'] = sprintf( __('This is a preview lesson. Please purchase the %1$s to access all lessons.', 'woothemes-sensei' ), $course_link );
                        } else {
                            $this->permissions_message['message'] =  sprintf( __('Please purchase the %1$s before starting this Lesson.', 'woothemes-sensei' ), $course_link );
                        }
                    } else {
                        if ( $is_preview ) {
                            $this->permissions_message['message'] = sprintf( __('This is a preview lesson. Please sign up for the %1$s to access all lessons.', 'woothemes-sensei' ), $course_link );
                        } else {
                            /** This filter is documented in class-woothemes-sensei-frontend.php */
                            $this->permissions_message['message'] =  sprintf( __( 'Please sign up for the %1$s before starting the lesson.', 'woothemes-sensei' ), $course_link );
                        }
                    } // End If Statement
                } // End If Statement
                break;
            case 'quiz-single':
                $lesson_id = get_post_meta( $post->ID, '_quiz_lesson',true );
                $lesson_course_id = get_post_meta( $lesson_id, '_lesson_course',true );

                $update_course = Sensei_WC::course_update( $lesson_course_id );
                if ( ( $this->access_settings() && Sensei_Utils::user_started_course( $lesson_course_id, $current_user->ID ) ) || sensei_all_access() ) {

                    // Check for prerequisite lesson for this quiz
                    $lesson_prerequisite_id = (int) get_post_meta( $lesson_id, '_lesson_prerequisite', true);
                    $user_lesson_prerequisite_complete = Sensei_Utils::user_completed_lesson( $lesson_prerequisite_id, $current_user->ID);

                    // Handle restrictions
                    if( sensei_all_access() ) {

                        $user_allowed = true;

                    } else {

                        if ( 0 < absint( $lesson_prerequisite_id ) && ( !$user_lesson_prerequisite_complete ) ) {

                            $this->permissions_message['title'] = get_the_title( $post->ID ) . ': ' . __('Restricted Access', 'woothemes-sensei' );
                            $lesson_link = '<a href="' . esc_url( get_permalink( $lesson_prerequisite_id ) ) . '">' . __( 'lesson', 'woothemes-sensei' ) . '</a>';
                            $this->permissions_message['message'] = sprintf( __('Please complete the previous %1$s before taking this Quiz.', 'woothemes-sensei' ), $lesson_link );

                        } else {

                            $user_allowed = true;

                        } // End If Statement
                    } // End If Statement
                } elseif( $this->access_settings() ) {
                    // Check if the user has started the course

                    if ( is_user_logged_in() && ! Sensei_Utils::user_started_course( $lesson_course_id, $current_user->ID ) && ( isset( $this->settings->settings['access_permission'] ) && ( true == $this->settings->settings['access_permission'] ) ) ) {

                        $user_allowed = false;
                        $this->permissions_message['title'] = get_the_title( $post->ID ) . ': ' . __('Restricted Access', 'woothemes-sensei' );
                        $course_link = '<a href="' . esc_url( get_permalink( $lesson_course_id ) ) . '">' . __( 'course', 'woothemes-sensei' ) . '</a>';
                        $wc_post_id = get_post_meta( $lesson_course_id, '_course_woocommerce_product',true );
                        if ( Sensei_WC::is_woocommerce_active() && ( 0 < $wc_post_id ) ) {
                            $this->permissions_message['message'] = sprintf( __('Please purchase the %1$s before starting this Quiz.', 'woothemes-sensei' ), $course_link );
                        } else {
                            $this->permissions_message['message'] = sprintf( __('Please sign up for the %1$s before starting this Quiz.', 'woothemes-sensei' ), $course_link );
                        } // End If Statement
                    } else {
                        $user_allowed = true;
                    } // End If Statement
                } else {
                    $this->permissions_message['title'] = get_the_title( $post->ID ) . ': ' . __('Restricted Access', 'woothemes-sensei' );
                    $course_link = '<a href="' . esc_url( get_permalink( get_post_meta( get_post_meta( $post->ID, '_quiz_lesson', true ), '_lesson_course', true ) ) ) . '">' . __( 'course', 'woothemes-sensei' ) . '</a>';
                    $this->permissions_message['message'] = sprintf( __('Please sign up for the %1$s before taking this Quiz.', 'woothemes-sensei' ), $course_link );
                } // End If Statement
                break;
            default:
                $user_allowed = true;
                break;

        } // End Switch Statement

        /**
         * filter the permissions message shown on sensei post types.
         *
         * @since 1.8.7
         *
         * @param array $permissions_message{
         *
         *   @type string $title
         *   @type string $message
         *
         * }
         * @param string $post_id
         */
        $this->permissions_message = apply_filters( 'sensei_permissions_message', $this->permissions_message, $post->ID );

		// add the permissions message to the stack

        if( sensei_all_access() || Sensei_Utils::is_preview_lesson( $post->ID ) ) {
            $user_allowed = true;
        }

        /**
         * Filter the permissions check final result. Which determines if the user has
         * access to the given page.
         *
         * @since 1.0
         *
         * @param boolean $user_allowed
         * @param integer $user_id
         *
         */
        return apply_filters( 'sensei_access_permissions', $user_allowed, $current_user->ID );

    } // End get_placeholder_image()


    /**
     * Check if visitors have access permission. If the "access_permission" setting is active, do a log in check.
     * @since  1.0.0
     * @access public
     * @return bool
     */
    public function access_settings () {

        if( sensei_all_access() ) return true;

        if ( isset( $this->settings->settings['access_permission'] ) && ( true == $this->settings->settings['access_permission'] ) ) {
            if ( is_user_logged_in() ) {
                return true;
            } else {
                return false;
            } // End If Statement
        } else {
            return true;
        } // End If Statement
    } // End access_settings()

    /**
     * load_class loads in class files
     * @since   1.2.0
     * @access  public
     * @return  void
     */
    public function load_class ( $class_name = '' ) {
        if ( '' != $class_name && '' != $this->token ) {
            require_once( 'class-' . esc_attr( $this->token ) . '-' . esc_attr( $class_name ) . '.php' );
        } // End If Statement
    } // End load_class()

    /**
     * Filtering wp_count_comments to ensure that Sensei comments are ignored
     * @since   1.4.0
     * @access  public
     * @param  array   $comments
     * @param  integer $post_id
     * @return array
     */
    public function sensei_count_comments( $comments, $post_id ) {
        global $wpdb;

        $post_id = (int) $post_id;

        $count = wp_cache_get("comments-{$post_id}", 'counts');

        if ( false !== $count ) {
            return $count;
        }

        $statuses = array( '' ); // Default to the WP normal comments
        $stati = $wpdb->get_results( "SELECT comment_type FROM {$wpdb->comments} GROUP BY comment_type", ARRAY_A );
        foreach ( (array) $stati AS $status ) {
            if ( 'sensei_' != substr($status['comment_type'], 0, 7 ) ) {
                $statuses[] = $status['comment_type'];
            }
        }
        $where = "WHERE comment_type IN ('" . join("', '", array_unique( $statuses ) ) . "')";

        if ( $post_id > 0 )
            $where .= $wpdb->prepare( " AND comment_post_ID = %d", $post_id );

        $count = $wpdb->get_results( "SELECT comment_approved, COUNT( * ) AS num_comments FROM {$wpdb->comments} {$where} GROUP BY comment_approved", ARRAY_A );

        $total = 0;
        $approved = array('0' => 'moderated', '1' => 'approved', 'spam' => 'spam', 'trash' => 'trash', 'post-trashed' => 'post-trashed');
        foreach ( (array) $count as $row ) {
            // Don't count post-trashed toward totals
            if ( 'post-trashed' != $row['comment_approved'] && 'trash' != $row['comment_approved'] )
                $total += $row['num_comments'];
            if ( isset( $approved[$row['comment_approved']] ) )
                $stats[$approved[$row['comment_approved']]] = $row['num_comments'];
        }

        $stats['total_comments'] = $total;
        foreach ( $approved as $key ) {
            if ( empty($stats[$key]) )
                $stats[$key] = 0;
        }

        $stats = (object) $stats;
        wp_cache_set("comments-{$post_id}", $stats, 'counts');

        return $stats;
    }

    /**
     * Init images.
     *
     * @since 1.4.5
     * @access public
     * @return void
     */
    public function init_image_sizes() {
        $course_archive_thumbnail 	= $this->get_image_size( 'course_archive_image' );
        $course_single_thumbnail	= $this->get_image_size( 'course_single_image' );
        $lesson_archive_thumbnail 	= $this->get_image_size( 'lesson_archive_image' );
        $lesson_single_thumbnail	= $this->get_image_size( 'lesson_single_image' );

        add_image_size( 'course_archive_thumbnail', $course_archive_thumbnail['width'], $course_archive_thumbnail['height'], $course_archive_thumbnail['crop'] );
        add_image_size( 'course_single_thumbnail', $course_single_thumbnail['width'], $course_single_thumbnail['height'], $course_single_thumbnail['crop'] );
        add_image_size( 'lesson_archive_thumbnail', $lesson_archive_thumbnail['width'], $lesson_archive_thumbnail['height'], $lesson_archive_thumbnail['crop'] );
        add_image_size( 'lesson_single_thumbnail', $lesson_single_thumbnail['width'], $lesson_single_thumbnail['height'], $lesson_single_thumbnail['crop'] );
    }

    /**
     * Get an image size.
     *
     * Variable is filtered by sensei_get_image_size_{image_size}
     *
     * @since 1.4.5
     * @access public
     * @param mixed $image_size
     * @return string
     */
    public function get_image_size( $image_size ) {

        // Only return sizes we define in settings
        if ( ! in_array( $image_size, array( 'course_archive_image', 'course_single_image', 'lesson_archive_image', 'lesson_single_image' ) ) )
            return apply_filters( 'sensei_get_image_size_' . $image_size, '' );

        if( ! isset( $this->settings->settings[ $image_size . '_width' ] ) ) {
            $this->settings->settings[ $image_size . '_width' ] = false;
        }
        if( ! isset( $this->settings->settings[ $image_size . '_height' ] ) ) {
            $this->settings->settings[ $image_size . '_height' ] = false;
        }
        if( ! isset( $this->settings->settings[ $image_size . '_hard_crop' ] ) ) {
            $this->settings->settings[ $image_size . '_hard_crop' ] = false;
        }

        $size = array_filter( array(
            'width' => $this->settings->settings[ $image_size . '_width' ],
            'height' => $this->settings->settings[ $image_size . '_height' ],
            'crop' => $this->settings->settings[ $image_size . '_hard_crop' ]
        ) );

        $size['width'] 	= isset( $size['width'] ) ? $size['width'] : '100';
        $size['height'] = isset( $size['height'] ) ? $size['height'] : '100';
        $size['crop'] 	= isset( $size['crop'] ) ? $size['crop'] : 0;

        return apply_filters( 'sensei_get_image_size_' . $image_size, $size );
    }

    public function body_class( $classes ) {
        if( is_sensei() ) {
            $classes[] = 'sensei';
        }
        return $classes;
    }

    /**
     * Checks that the Jetpack Beautiful Maths module has been activated to support LaTeX within question titles and answers
     *
     * @return null
     * @since 1.7.0
     */
    public function jetpack_latex_support() {
        if ( function_exists( 'latex_markup') ) {
            add_filter( 'sensei_question_title', 'latex_markup' );
            add_filter( 'sensei_answer_text', 'latex_markup' );
        }
    }

    /**
     * Load the module functionality.
     *
     * This function is hooked into plugins_loaded to avoid conflicts with
     * the retired modules extension.
     *
     * @since 1.8.0
     */
    public function load_modules_class(){
        global $sensei_modules;

        if( !class_exists( 'Sensei_Modules' )
            &&  'Sensei_Modules' != get_class( $sensei_modules ) ) {

            //Load the modules class
            require_once( 'class-sensei-modules.php');
            Sensei()->modules = new Sensei_Core_Modules( $this->file );

        }else{
            // fallback for people still using the modules extension.
            global $sensei_modules;
            Sensei()->modules = $sensei_modules;
            add_action( 'admin_notices', array( $this, 'disable_sensei_modules_extension'), 30 );
        }
    }

    /**
     * Tell the user to that the modules extension is no longer needed.
     *
     * @since 1.8.0
     */
    public function disable_sensei_modules_extension(){ ?>
        <div class="notice updated fade">
            <p>
                <?php
                $plugin_manage_url = admin_url().'plugins.php#sensei-modules';
                $plugin_link_element = '<a href="' . $plugin_manage_url . '" >plugins page</a> ';
                ?>
                <strong> Modules are now included in Sensei,</strong> so you no longer need the Sensei Modules extension.
                Please deactivate and delete it from your <?php echo $plugin_link_element; ?>. (This will not affect your existing modules).
            </p>
        </div>

    <?php }// end function

    /**
     * Sensei wide rewrite flush call.
     *
     * To use this simply update the option 'sensei_flush_rewrite_rules' to 1
     *
     * After the option is one the Rules will be flushed.
     *
     * @since 1.9.0
     */
    public function flush_rewrite_rules(){

        // ensures that the rewrite rules are flushed on the second
        // attempt. This ensure that the settings for any other process
        // have been completed and saved to the database before we refresh the
        // rewrite rules.
        $option =  get_option('sensei_flush_rewrite_rules');
        if( '1' == $option ) {

            update_option('sensei_flush_rewrite_rules', '2');

        }elseif( '2' == $option ) {

            flush_rewrite_rules();
            update_option('sensei_flush_rewrite_rules', '0');

        }

    } // end flush_rewrite_rules

    /**
     * Calling this function will tell Sensei to flush rewrite
     * rules on the next load.
     *
     * @since 1.9.0
     */
    public function initiate_rewrite_rules_flush(){

        update_option('sensei_flush_rewrite_rules', '1');

    }

    /**
     * sensei_woocommerce_email_course_details adds detail to email
     *
     * @deprecated since 1.9.0 use Sensei_WC::email_course_details
     *
     * @since   1.4.5
     * @access  public
     * @param   WC_Order $order
     *
     * @return  void
     */
    public function sensei_woocommerce_email_course_details( $order ) {

        Sensei_WC::email_course_details( $order );

    } // end func email course details

    /**
     * @deprecated since 1.9.0, movde to the Sensei_WC class
     * @param $user_id
     * @param $subscription_key
     */
    public function sensei_woocommerce_reactivate_subscription( $user_id, $subscription_key ){

        Sensei_WC::reactivate_subscription( $user_id, $subscription_key );
    }

    /**
     * @deprecated since 1.9.0, movde to the Sensei_WC class
     * @param $user_id
     * @param $subscription_key
     */
    public function sensei_woocommerce_subscription_ended( $user_id, $subscription_key ){

        Sensei_WC::end_subscription( $user_id, $subscription_key );
    }

    /**
     * sensei_woocommerce_complete_order description
     *
     * @deprecated since 1.9.0 use Sensei_WC::complete_order( $order_id );
     * @since   1.0.3
     * @access  public
     * @param   int $order_id WC order ID
     *
     * @return  void
     */
    public function sensei_woocommerce_complete_order ( $order_id = 0 ) {

        Sensei_WC::complete_order( $order_id );

    } // End sensei_woocommerce_complete_order()

    /**
     * Runs when an order is cancelled.
     *
     * @deprecated since 1.9.0
     *
     * @since   1.2.0
     * @param   integer $order_id order ID
     * @return  void
     */
    public function sensei_woocommerce_cancel_order ( $order_id ) {

        Sensei_WC::cancel_order( $order_id );

    } // End sensei_woocommerce_cancel_order()

    /**
     * sensei_activate_subscription runs when a subscription product is purchased
     * @deprecated since 1.9.0
     * @since   1.2.0
     * @access  public
     * @param   integer $order_id order ID
     * @return  void
     */
    public function sensei_activate_subscription(  $order_id = 0 ) {

        Sensei_WC::activate_subscription( $order_id );

    } // End sensei_activate_subscription()

    /**
     * If WooCommerce is activated and the customer has purchased the course, update Sensei to indicate that they are taking the course.
     * @deprecated since 1.9.0
     * @since  1.0.0
     * @param  int 			$course_id  (default: 0)
     * @param  array/Object $order_user (default: array()) Specific user's data.
     * @return bool|int
     */
    public function woocommerce_course_update ( $course_id = 0, $order_user = array()  ) {

        return Sensei_WC::course_update( $course_id, $order_user );

    } // End woocommerce_course_update()

    /**
     * Returns the WooCommerce Product Object
     *
     * The code caters for pre and post WooCommerce 2.2 installations.
     *
     * @deprecated since 1.9.0
     * @since   1.1.1
     *
     * @param   integer $wc_product_id Product ID or Variation ID
     * @param   string  $product_type  '' or 'variation'
     *
     * @return   WC_Product $wc_product_object
     */
    public function sensei_get_woocommerce_product_object ( $wc_product_id = 0, $product_type = '' ) {

        return Sensei_WC::get_product_object( $wc_product_id, $product_type );

    } // End sensei_get_woocommerce_product_object()

    /**
     * Setup required WooCommerce settings.
     * @access  public
     * @since   1.1.0
     * @return  void
     */
    public function set_woocommerce_functionality() {

        _deprecated_function('Sensei()->set_woocommerce_functionality', 'Sensei 1.9.0');

    } // End set_woocommerce_functionality()

    /**
     * Disable guest checkout if a course product is in the cart
     * @deprecated since 1.9.0
     * @param  boolean $guest_checkout Current guest checkout setting
     * @return boolean                 Modified guest checkout setting
     */
    public function disable_guest_checkout( $guest_checkout ) {

        return Sensei_WC::disable_guest_checkout( $guest_checkout );

    }// end disable_guest_checkout

    /**
     * Change order status with virtual products to completed
     *
     * @deprecated since 1.9.0 use Sensei_WC::virtual_order_payment_complete( $order_status, $order_id )
     *
     * @since  1.1.0
     * @param string $order_status
     * @param int $order_id
     * @return string
     **/
    public function virtual_order_payment_complete( $order_status, $order_id ) {

        return  Sensei_WC::virtual_order_payment_complete( $order_status, $order_id );
    }

} // End Class

/**
 * Class Woothemes_Sensei
 * @ignore only for backward compatibility
 * @since 1.9.0
 */
class Woothemes_Sensei extends Sensei_Main{ }