mambax7 / chess

create.php

<?php

// $Id$
//  ------------------------------------------------------------------------ //
//                XOOPS - PHP Content Management System                      //
//                    Copyright (c) 2000 XOOPS.org                           //
//                       <https://xoops.org>                             //
// ------------------------------------------------------------------------- //
//  This program is free software; you can redistribute it and/or modify     //
//  it under the terms of the GNU General Public License as published by     //
//  the Free Software Foundation; either version 2 of the License, or        //
//  (at your option) any later version.                                      //
//                                                                           //
//  You may not change or alter any portion of this comment or credits       //
//  of supporting developers from this source code or any supporting         //
//  source code which is considered copyrighted (c) material of the          //
//  original comment or credit authors.                                      //
//                                                                           //
//  This program is distributed in the hope that it will be useful,          //
//  but WITHOUT ANY WARRANTY; without even the implied warranty of           //
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the            //
//  GNU General Public License for more details.                             //
//                                                                           //
//  You should have received a copy of the GNU General Public License        //
//  along with this program; if not, write to the Free Software              //
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA //
//  ------------------------------------------------------------------------ //

/**
 * This module handles chess game creation.
 *
 * The following forms are generated and processed:
 *
 *  - Create-form 1 - Specify game type (open challenge, individual challenge or self-play).
 *  - Create-form 2 - Specify opponent (for individual challenge), and color and rating options (for open challenge and individual challenge).
 *  - Create-form 3 - Confirm entries from forms 1 and 2.
 *  - Accept-form   - Accept challenge.
 *  - Delete-form   - Delete challenge.
 *
 * @package    chess
 * @subpackage challenge
 */

use XoopsModules\Chess;
use \Xmf\Request;

/**#@+
 */

require __DIR__ . '/header.php';
$xoopsConfig['module_cache'][$xoopsModule->getVar('mid')] = 0; // disable caching

require_once XOOPS_ROOT_PATH . '/class/xoopsformloader.php';
require_once XOOPS_ROOT_PATH . '/modules/chess/include/constants.inc.php';
require_once XOOPS_ROOT_PATH . '/modules/chess/include/functions.php';

#var_dump($_REQUEST);#*#DEBUG#

if (!chess_can_play()) {
    redirect_header(XOOPS_URL . '/index.php', _CHESS_REDIRECT_DELAY_FAILURE, _NOPERM);
}

// user input
//$gametype          = chess_sanitize(@$_POST['gametype']);
//$opponent          = chess_sanitize(trim(@$_POST['opponent']), _CHESS_USERNAME_ALLOWED_CHARACTERS);
$gametype     = Request::getCmd('gametype', '', 'POST');
$opponent     = preg_replace('/[^' . _CHESS_USERNAME_ALLOWED_CHARACTERS . ']/i', '', Request::getString('opponent', '', 'POST'));
$opponent     = trim($opponent);
$opponent_uid      = !empty($opponent) ? chess_opponent_uid($opponent) : 0;
//$fen               = chess_moduleConfig('allow_setup') ? chess_sanitize(trim(@$_POST['fen']), 'A-Za-z0-9 /-') : '';
$fen               = chess_moduleConfig('allow_setup') ? preg_replace('/[^a-z0-9 \/\-]/i', '', Request::getString('fen', '', 'POST')) : '';
$coloroption       = chess_sanitize(@$_POST['coloroption']);
$rated             = Request::getInt('rated', 0);
$notify_accept     = Request::hasVar('notify_accept', 'POST');
$notify_move       = Request::hasVar('notify_move', 'POST');
$challenge_id      = Request::getInt('challenge_id', 0);
$show_arbiter_ctrl = Request::hasVar('show_arbiter_ctrl', 'POST');
$submit_challenge1 = Request::hasVar('submit_challenge1', 'POST');
$submit_challenge2 = Request::hasVar('submit_challenge2', 'POST');
$submit_challenge3 = Request::hasVar('submit_challenge3', 'POST');
$cancel_challenge1 = Request::hasVar('cancel_challenge1', 'POST');
$cancel_challenge2 = Request::hasVar('cancel_challenge2', 'POST');
$cancel_challenge3 = Request::hasVar('cancel_challenge3', 'POST');
$submit_accept     = Request::hasVar('submit_accept', 'POST');
$cancel_accept     = Request::hasVar('cancel_accept', 'POST');
$submit_delete     = Request::hasVar('submit_delete', 'POST');
$confirm_delete    = Request::getInt('confirm_delete', 0, 'POST');

// If form-submit, check security token.
if (($submit_challenge1 || $submit_challenge2 || $submit_challenge3 || $submit_accept || $submit_delete || $show_arbiter_ctrl) && is_object($GLOBALS['xoopsSecurity']) && !$GLOBALS['xoopsSecurity']->check()) {
    redirect_header(
        XOOPS_URL . '/modules/chess/',
        _CHESS_REDIRECT_DELAY_FAILURE,
        _MD_CHESS_TOKEN_ERROR . '<br>' . implode('<br>', $GLOBALS['xoopsSecurity']->getErrors())
    );
}

// If rating feature disabled, force ratings to off.
if ('none' == chess_moduleConfig('rating_system')) {
    $rated = 0;
}

$uid = is_object($xoopsUser) ? $xoopsUser->getVar('uid') : 0;

// Determine if user is a valid arbiter.
$is_arbiter = is_object($xoopsUser) && $xoopsUser->isAdmin($xoopsModule->getVar('mid'));

if ($cancel_challenge1) {
    redirect_header(XOOPS_URL . '/modules/chess/', _CHESS_REDIRECT_DELAY_SUCCESS, _TAKINGBACK);
} elseif ($cancel_challenge2) {
    chess_show_create_form1($gametype);
} elseif ($cancel_challenge3) {
    if (_CHESS_GAMETYPE_OPEN == $gametype || _CHESS_GAMETYPE_USER == $gametype) {
        chess_show_create_form2($gametype, $fen);
    } else {
        chess_show_create_form1($gametype, $fen);
    }
} elseif ($cancel_accept) {
    redirect_header(XOOPS_URL . '/modules/chess/', _CHESS_REDIRECT_DELAY_SUCCESS, _TAKINGBACK);
} elseif ($submit_challenge1) {
    $fen_error = chess_fen_error($fen);

    if (!empty($fen_error)) {
        chess_show_create_form1($gametype, $fen, _MD_CHESS_FEN_INVALID . ': ' . $fen_error);
    } elseif (_CHESS_GAMETYPE_OPEN == $gametype || _CHESS_GAMETYPE_USER == $gametype) {
        chess_show_create_form2($gametype, $fen);
    } else {
        chess_show_create_form3($gametype, $fen, $coloroption, $opponent_uid, $rated);
    }
} elseif ($submit_challenge2) {
    if (_CHESS_GAMETYPE_USER == $gametype) {
        if (empty($opponent)) {
            chess_show_create_form2($gametype, $fen, $coloroption, $opponent_uid, $rated, _MD_CHESS_OPPONENT_MISSING);
        } elseif (!$opponent_uid) {
            chess_show_create_form2($gametype, $fen, $coloroption, $opponent_uid, $rated, _MD_CHESS_OPPONENT_INVALID);
        } elseif ($opponent_uid == $uid) {
            chess_show_create_form2($gametype, $fen, $coloroption, $opponent_uid, $rated, _MD_CHESS_OPPONENT_SELF);
        } else {
            chess_show_create_form3($gametype, $fen, $coloroption, $opponent_uid, $rated);
        }
    } else {
        chess_show_create_form3($gametype, $fen, $coloroption, $opponent_uid, $rated);
    }
} elseif ($submit_challenge3) {
    if (_CHESS_GAMETYPE_OPEN == $gametype) {
        chess_create_challenge($gametype, $fen, $coloroption, $rated, $notify_accept, $notify_move);

        redirect_header(XOOPS_URL . '/modules/chess/', _CHESS_REDIRECT_DELAY_SUCCESS, _MD_CHESS_GAME_CREATED);
    } elseif (_CHESS_GAMETYPE_USER == $gametype) {
        if (empty($opponent)) {
            chess_show_create_form2($gametype, $fen, $coloroption, $opponent_uid, $rated, _MD_CHESS_OPPONENT_MISSING);
        } elseif (!$opponent_uid) {
            chess_show_create_form2($gametype, $fen, $coloroption, $opponent_uid, $rated, _MD_CHESS_OPPONENT_INVALID);
        } elseif ($opponent_uid == $uid) {
            chess_show_create_form2($gametype, $fen, $coloroption, $opponent_uid, $rated, _MD_CHESS_OPPONENT_SELF);
        } else {
            chess_create_challenge($gametype, $fen, $coloroption, $rated, $notify_accept, $notify_move, $opponent_uid);

            redirect_header(XOOPS_URL . '/modules/chess/', _CHESS_REDIRECT_DELAY_SUCCESS, _MD_CHESS_GAME_CREATED);
        }
    } elseif (_CHESS_GAMETYPE_SELF == $gametype) {
        $game_id = chess_create_game($uid, $uid, $fen, $rated);

        redirect_header(XOOPS_URL . "/modules/chess/game.php?game_id=$game_id", _CHESS_REDIRECT_DELAY_SUCCESS, _MD_CHESS_GAME_CREATED);
    } else {
        chess_show_create_form1($gametype, $fen, _MD_CHESS_GAMETYPE_INVALID);
    }
} elseif ($submit_accept) {
    chess_accept_challenge($challenge_id, $coloroption, $notify_move);
} elseif ($submit_delete) {
    if ($confirm_delete) {
        if ($is_arbiter || chess_is_challenger($challenge_id)) {
            chess_delete_challenge($challenge_id);

            redirect_header(XOOPS_URL . '/modules/chess/', _CHESS_REDIRECT_DELAY_SUCCESS, _MD_CHESS_GAME_DELETED);
        } else {
            redirect_header(XOOPS_URL . '/modules/chess/', _CHESS_REDIRECT_DELAY_FAILURE, _NOPERM);
        }
    } else {
        chess_show_delete_form($challenge_id, $show_arbiter_ctrl && $is_arbiter, _MD_CHESS_NO_CONFIRM_DELETE);
    }
} elseif ($challenge_id) {
    if (($show_arbiter_ctrl && $is_arbiter) || chess_is_challenger($challenge_id)) {
        chess_show_delete_form($challenge_id, $show_arbiter_ctrl && $is_arbiter);
    } else {
        chess_show_accept_form($challenge_id);
    }
} else {
    chess_show_create_form1($gametype);
}

require_once XOOPS_ROOT_PATH . '/footer.php';
/**#@-*/

/**
 * Generate form to get game type and optional FEN setup.
 *
 * @param string $gametype  _CHESS_GAMETYPE_OPEN, _CHESS_GAMETYPE_USER or _CHESS_GAMETYPE_SELF
 * @param string $fen       FEN setup
 * @param string $error_msg Error message to display
 */
function chess_show_create_form1($gametype = _CHESS_GAMETYPE_OPEN, $fen = '', $error_msg = '')
{
    $form = new XoopsThemeForm(_MD_CHESS_CREATE_FORM, 'create_form1', 'create.php', 'post', true);

    if ($error_msg) {
        $form->addElement(new XoopsFormLabel(_MD_CHESS_ERROR . ': ', '<div class="errorMsg">' . $error_msg . '</div>'));
    }

    $menu_gametype = new XoopsFormSelect(_MD_CHESS_LABEL_GAMETYPE . ':', 'gametype', $gametype, 1, false);

    $menu_gametype->addOption(_CHESS_GAMETYPE_OPEN, _MD_CHESS_MENU_GAMETYPE_OPEN);

    $menu_gametype->addOption(_CHESS_GAMETYPE_USER, _MD_CHESS_MENU_GAMETYPE_USER);

    $menu_gametype->addOption(_CHESS_GAMETYPE_SELF, _MD_CHESS_MENU_GAMETYPE_SELF);

    $form->addElement($menu_gametype);

    if (chess_moduleConfig('allow_setup')) {
        $form->addElement(new XoopsFormLabel('', '&nbsp;'));

        $form->addElement(new XoopsFormLabel('', _MD_CHESS_LABEL_FEN_EXPLAIN));

        $form->addElement(new XoopsFormText(_MD_CHESS_LABEL_FEN_SETUP . ':', 'fen', 80, _CHESS_TEXTBOX_FEN_MAXLEN, $fen));
    }

    $form->addElement(new XoopsFormLabel('&nbsp;', '&nbsp;'));

    $buttons = new XoopsFormElementTray('');

    $buttons->addElement(new XoopsFormButton('', 'submit_challenge1', _MD_CHESS_CREATE_SUBMIT, 'submit'));

    $buttons->addElement(new XoopsFormButton('', 'cancel_challenge1', _MD_CHESS_CREATE_CANCEL, 'submit'));

    $form->addElement($buttons);

    $form->display();
}

/**
 * Generate form to get color and rating options and, if game type is _CHESS_GAMETYPE_USER (Individual challenge), get opponent.
 *
 * @param string $gametype     _CHESS_GAMETYPE_OPEN, _CHESS_GAMETYPE_USER or _CHESS_GAMETYPE_SELF
 * @param string $fen          FEN setup
 * @param string $coloroption  _CHESS_COLOROPTION_OPPONENT, _CHESS_COLOROPTION_RANDOM, _CHESS_COLOROPTION_WHITE or _CHESS_COLOROPTION_BLACK
 * @param int    $opponent_uid Opponent's user ID ('0' for open challenge)
 * @param int    $rated        '1' if rated, '0' if not rated
 * @param string $error_msg    Error message to display
 */
function chess_show_create_form2($gametype, $fen, $coloroption = _CHESS_COLOROPTION_OPPONENT, $opponent_uid = 0, $rated = 1, $error_msg = '')
{
    $form = new XoopsThemeForm(_MD_CHESS_CREATE_FORM, 'create_form2', 'create.php', 'post', true);

    $form->addElement(new XoopsFormHidden('gametype', $gametype));

    $form->addElement(new XoopsFormHidden('fen', $fen));

    if ($error_msg) {
        $form->addElement(new XoopsFormLabel(_MD_CHESS_ERROR . ':', '<div class="errorMsg">' . $error_msg . '</div>'));
    }

    $memberHandler = xoops_getHandler('member');

    $opponent_user = $memberHandler->getUser($opponent_uid);

The method getUser() does not exist on XoopsObjectHandler. It seems like you code against a sub-type of XoopsObjectHandler such as XoopsAvatarHandler or XoopsPersistableObjectHandler.

    $opponent_username = is_object($opponent_user) ? $opponent_user->getVar('uname') : '';

    if (_CHESS_GAMETYPE_USER == $gametype) {
        $form->addElement(
            new XoopsFormText(
                _MD_CHESS_LABEL_OPPONENT . ':', 'opponent', _CHESS_TEXTBOX_OPPONENT_SIZE, _CHESS_TEXTBOX_OPPONENT_MAXLEN, $opponent_username
            )
        );
    }

    $radio_color = new XoopsFormRadio(_MD_CHESS_LABEL_COLOR . ':', 'coloroption', $coloroption);

    $radio_color->addOption(_CHESS_COLOROPTION_OPPONENT, _MD_CHESS_RADIO_COLOR_OPPONENT);

    $radio_color->addOption(_CHESS_COLOROPTION_RANDOM, _MD_CHESS_RADIO_COLOR_RANDOM);

    $radio_color->addOption(_CHESS_COLOROPTION_WHITE, _MD_CHESS_RADIO_COLOR_WHITE);

    $radio_color->addOption(_CHESS_COLOROPTION_BLACK, _MD_CHESS_RADIO_COLOR_BLACK);

    $form->addElement($radio_color);

    if ('none' !== chess_moduleConfig('rating_system')) {
        if (_CHESS_GAMETYPE_OPEN == $gametype || _CHESS_GAMETYPE_USER == $gametype) {
            if (chess_moduleConfig('allow_unrated_games')) {
                $radio_rated = new XoopsFormRadio(_MD_CHESS_RATED_GAME . ':', 'rated', $rated);

                $radio_rated->addOption(1, _YES);

                $radio_rated->addOption(0, _NO);

                $form->addElement($radio_rated);
            } else {
                $form->addElement(new XoopsFormHidden('rated', $rated));
            }
        }
    } else {
        $form->addElement(new XoopsFormHidden('rated', 0));
    }

    $buttons = new XoopsFormElementTray('');

    $buttons->addElement(new XoopsFormButton('', 'submit_challenge2', _MD_CHESS_CREATE_SUBMIT, 'submit'));

    $buttons->addElement(new XoopsFormButton('', 'cancel_challenge2', _MD_CHESS_CREATE_CANCEL, 'submit'));

    $form->addElement($buttons);

    $form->display();
}

/**
 * Generate form to get confirmation of a new challenge.
 *
 * @param string $gametype     _CHESS_GAMETYPE_OPEN, _CHESS_GAMETYPE_USER or _CHESS_GAMETYPE_SELF
 * @param string $fen          FEN setup
 * @param string $coloroption  _CHESS_COLOROPTION_OPPONENT, _CHESS_COLOROPTION_RANDOM, _CHESS_COLOROPTION_WHITE or _CHESS_COLOROPTION_BLACK
 * @param int    $opponent_uid Opponent's user ID ('0' for open challenge)
 * @param int    $rated        '1' if rated, '0' if not rated
 */
function chess_show_create_form3($gametype, $fen, $coloroption, $opponent_uid, $rated)
{
    $memberHandler = xoops_getHandler('member');

    $opponent_user = $memberHandler->getUser($opponent_uid);

    $opponent_username = is_object($opponent_user) ? $opponent_user->getVar('uname') : '';

    $form = new XoopsThemeForm(_MD_CHESS_CREATE_FORM, 'create_form3', 'create.php', 'post', true);

    $form->addElement(new XoopsFormHidden('gametype', $gametype));

    $form->addElement(new XoopsFormHidden('fen', $fen));

    $form->addElement(new XoopsFormHidden('opponent', $opponent_username));

    $form->addElement(new XoopsFormHidden('coloroption', $coloroption));

    $form->addElement(new XoopsFormHidden('rated', $rated));

    $form->addElement(new XoopsFormLabel('', '<div class="confirmMsg">' . _MD_CHESS_GAME_CONFIRM . '</div>'));

    switch ($gametype) {
        case _CHESS_GAMETYPE_OPEN:
            $label_gametype = _MD_CHESS_LABEL_GAMETYPE_OPEN;
            break;
        case _CHESS_GAMETYPE_USER:
            $label_gametype = _MD_CHESS_LABEL_GAMETYPE_USER;
            break;
        case _CHESS_GAMETYPE_SELF:
            $label_gametype = _MD_CHESS_LABEL_GAMETYPE_SELF;
            break;
        default:
            $label_gametype = _MD_CHESS_LABEL_ERROR;
            break;
    }

    $form->addElement(new XoopsFormLabel(_MD_CHESS_LABEL_GAMETYPE . ':', $label_gametype));

    if (!empty($fen)) {
        $form->addElement(new XoopsFormLabel(_MD_CHESS_LABEL_FEN_SETUP . ':', $fen));
    }

    if (_CHESS_GAMETYPE_USER == $gametype) {
        $memberHandler = xoops_getHandler('member');

        $opponent_user = $memberHandler->getUser($opponent_uid);

        $opponent_username = is_object($opponent_user) ? $opponent_user->getVar('uname') : '';

        $form->addElement(new XoopsFormLabel(_MD_CHESS_LABEL_OPPONENT . ':', $opponent_username));
    }

    if (_CHESS_GAMETYPE_OPEN == $gametype || _CHESS_GAMETYPE_USER == $gametype) {
        switch ($coloroption) {
            case _CHESS_COLOROPTION_OPPONENT:
                $label_coloroption = _MD_CHESS_RADIO_COLOR_OPPONENT;
                break;
            case _CHESS_COLOROPTION_RANDOM:
                $label_coloroption = _MD_CHESS_RADIO_COLOR_RANDOM;
                break;
            case _CHESS_COLOROPTION_WHITE:
                $label_coloroption = _MD_CHESS_RADIO_COLOR_WHITE;
                break;
            case _CHESS_COLOROPTION_BLACK:
                $label_coloroption = _MD_CHESS_RADIO_COLOR_BLACK;
                break;
            default:
                $label_coloroption = _MD_CHESS_LABEL_ERROR;
                break;
        }

        $form->addElement(new XoopsFormLabel(_MD_CHESS_LABEL_COLOR . ':', $label_coloroption));

        if ('none' != chess_moduleConfig('rating_system')) {
            $form->addElement(new XoopsFormLabel(_MD_CHESS_RATED_GAME . ':', $rated ? _YES : _NO));
        }

        // Determine whether current user is subscribed to receive a notification when his challenge is accepted.

        global $xoopsModule, $xoopsUser;

        $uid = $xoopsUser->getVar('uid');

        $mid = $xoopsModule->getVar('mid');

        $notificationHandler = xoops_getHandler('notification');

        $is_subscribed = 0 != $notificationHandler->isSubscribed('global', 0, 'notify_accept_challenge', $mid, $uid);

The method isSubscribed() does not exist on XoopsObjectHandler. It seems like you code against a sub-type of XoopsObjectHandler such as XoopsNotificationHandler or XoopsPersistableObjectHandler.

        // Display checkbox with checked-state reflecting subscription status.

        $checked_value = 1;

        $checkbox_notify_acpt_chal = new XoopsFormCheckBox('', 'notify_accept', $is_subscribed ? $checked_value : null);

        $checkbox_notify_acpt_chal->addOption($checked_value, _MD_CHESS_NEVT_ACPT_CHAL_CAP);

        $form->addElement($checkbox_notify_acpt_chal);

        // Display checkbox, initially checked.

        $checked_value = 1;

        $checkbox_notify_move = new XoopsFormCheckBox('', 'notify_move', $checked_value);

        $checkbox_notify_move->addOption($checked_value, _MD_CHESS_NEVT_MOVE_CAP);

        $form->addElement($checkbox_notify_move);
    }

    $buttons = new XoopsFormElementTray('');

    $buttons->addElement(new XoopsFormButton('', 'submit_challenge3', _MD_CHESS_CREATE_SUBMIT, 'submit'));

    $buttons->addElement(new XoopsFormButton('', 'cancel_challenge3', _MD_CHESS_CREATE_CANCEL, 'submit'));

    $form->addElement($buttons);

    $form->display();
}

/**
 * Generate form to get acceptance of a challenge.
 *
 * @param int $challenge_id Challenge ID
 */
function chess_show_accept_form($challenge_id)
{
    global $xoopsDB, $xoopsUser;

    $challenges_table = $xoopsDB->prefix('chess_challenges');

    $result = $xoopsDB->query(
        trim(
            "
        SELECT game_type, fen, color_option, player1_uid, player2_uid, UNIX_TIMESTAMP(create_date) as create_date, is_rated
        FROM   $challenges_table
        WHERE  challenge_id = '$challenge_id'
    "
        )
    );

    if ($xoopsDB->getRowsNum($result) < 1) {
        redirect_header(XOOPS_URL . '/modules/chess/', _CHESS_REDIRECT_DELAY_FAILURE, _MD_CHESS_GAME_NOT_FOUND);
    }

    $row = $xoopsDB->fetchArray($result);

    $xoopsDB->freeRecordSet($result);

    $form = new XoopsThemeForm(_MD_CHESS_ACCEPT_FORM, 'accept_form', 'create.php', 'post', true);

    $form->addElement(new XoopsFormHidden('challenge_id', $challenge_id));

    $form->addElement(new XoopsFormLabel(_MD_CHESS_LABEL_DATE_CREATED . ':', formatTimestamp($row['create_date'], 'm')));

    $memberHandler = xoops_getHandler('member');

    switch ($row['game_type']) {
        case _CHESS_GAMETYPE_OPEN:
            $label_gametype = _MD_CHESS_LABEL_GAMETYPE_OPEN;
            break;
        case _CHESS_GAMETYPE_USER:
            $player2_user     = $memberHandler->getUser($row['player2_uid']);
            $player2_username = is_object($player2_user) ? $player2_user->getVar('uname') : '?';
            $label_gametype   = _MD_CHESS_LABEL_GAMETYPE_USER . ': ' . $player2_username;
            break;
        case _CHESS_GAMETYPE_SELF:
            $label_gametype = _MD_CHESS_LABEL_GAMETYPE_SELF;
            break;
        default:
            $label_gametype = _MD_CHESS_LABEL_ERROR;
            break;
    }

    $form->addElement(new XoopsFormLabel(_MD_CHESS_LABEL_GAMETYPE . ':', $label_gametype));

    $player1_user = $memberHandler->getUser($row['player1_uid']);

    $player1_username = is_object($player1_user) ? $player1_user->getVar('uname') : '?';

    $form->addElement(
        new XoopsFormLabel(
            _MD_CHESS_LABEL_CHALLENGER . ':', "<a href='" . XOOPS_URL . "/modules/chess/player_stats.php?player_uid={$row['player1_uid']}'>$player1_username</a>"
        )
    );

    $player2_username = $xoopsUser ? $xoopsUser->getVar('uname') : '?';

    $form->addElement(new XoopsFormLabel(_MD_CHESS_LABEL_OPPONENT . ':', $player2_username));

    if (!empty($row['fen'])) {
        $form->addElement(new XoopsFormLabel(_MD_CHESS_LABEL_FEN_SETUP . ':', $row['fen']));
    }

    if (_CHESS_COLOROPTION_OPPONENT == $row['color_option']) {
        $radio_color = new XoopsFormRadio(_MD_CHESS_LABEL_COLOR . ':', 'coloroption', _CHESS_COLOROPTION_RANDOM);

        $radio_color->addOption(_CHESS_COLOROPTION_RANDOM, _MD_CHESS_RADIO_COLOR_RANDOM);

        $radio_color->addOption(_CHESS_COLOROPTION_WHITE, _MD_CHESS_RADIO_COLOR_WHITE);

        $radio_color->addOption(_CHESS_COLOROPTION_BLACK, _MD_CHESS_RADIO_COLOR_BLACK);

        $form->addElement($radio_color);
    } else {
        switch ($row['color_option']) {
            case _CHESS_COLOROPTION_RANDOM:
                $label_coloroption = _MD_CHESS_RADIO_COLOR_RANDOM;
                break;
            case _CHESS_COLOROPTION_WHITE:
                $label_coloroption = _MD_CHESS_RADIO_COLOR_BLACK; // player1 white, player2 black
                break;
            case _CHESS_COLOROPTION_BLACK:
                $label_coloroption = _MD_CHESS_RADIO_COLOR_WHITE; // player1 black, player2 white
                break;
            default:
                $label_coloroption = _MD_CHESS_LABEL_ERROR;
                break;
        }

        $form->addElement(new XoopsFormLabel(_MD_CHESS_LABEL_COLOR . ':', $label_coloroption));
    }

    if ('none' != chess_moduleConfig('rating_system')) {
        $form->addElement(new XoopsFormLabel(_MD_CHESS_RATED_GAME . ':', $row['is_rated'] ? _YES : _NO));
    }

    // Display notification-subscribe checkbox, initially checked.

    $checked_value = 1;

    $checkbox_notify_move = new XoopsFormCheckBox('', 'notify_move', $checked_value);

    $checkbox_notify_move->addOption($checked_value, _MD_CHESS_NEVT_MOVE_CAP);

    $form->addElement($checkbox_notify_move);

    $tray = new XoopsFormElementTray('');

    $tray->addElement(new XoopsFormButton('', 'submit_accept', _MD_CHESS_CREATE_ACCEPT, 'submit'));

    $tray->addElement(new XoopsFormButton('', 'cancel_accept', _MD_CHESS_CREATE_CANCEL, 'submit'));

    $form->addElement($tray);

    $form->display();
}

/**
 * Generate form to delete challenge.
 *
 * @param int    $challenge_id      Challenge ID
 * @param bool   $show_arbiter_ctrl True if form generated from admin page
 * @param string $error_msg         Error message to display
 */
function chess_show_delete_form($challenge_id, $show_arbiter_ctrl, $error_msg = '')
{
    global $xoopsDB;

    $challenges_table = $xoopsDB->prefix('chess_challenges');

    $result = $xoopsDB->query(
        trim(
            "
        SELECT game_type, fen, color_option, player1_uid, player2_uid, UNIX_TIMESTAMP(create_date) as create_date, is_rated
        FROM   $challenges_table
        WHERE  challenge_id = '$challenge_id'
    "
        )
    );

    if ($xoopsDB->getRowsNum($result) < 1) {
        redirect_header(XOOPS_URL . '/modules/chess/', _CHESS_REDIRECT_DELAY_FAILURE, _MD_CHESS_GAME_NOT_FOUND);
    }

    $row = $xoopsDB->fetchArray($result);

    $xoopsDB->freeRecordSet($result);

    $form = new XoopsThemeForm(_MD_CHESS_DELETE_FORM, 'delete_form', 'create.php', 'post', true);

    $form->addElement(new XoopsFormHidden('challenge_id', $challenge_id));

    if ($show_arbiter_ctrl) {
        $form->addElement(new XoopsFormHidden('show_arbiter_ctrl', $show_arbiter_ctrl));

$show_arbiter_ctrl of type true is incompatible with the type string expected by parameter $value of XoopsFormHidden::__construct().

    }

    if ($error_msg) {
        $form->addElement(new XoopsFormLabel(_MD_CHESS_ERROR . ': ', '<div class="errorMsg">' . $error_msg . '</div>'));
    }

    $form->addElement(new XoopsFormLabel(_MD_CHESS_LABEL_DATE_CREATED . ':', formatTimestamp($row['create_date'], 'm')));

    $memberHandler = xoops_getHandler('member');

    switch ($row['game_type']) {
        case _CHESS_GAMETYPE_OPEN:
            $label_gametype = _MD_CHESS_LABEL_GAMETYPE_OPEN;
            break;
        case _CHESS_GAMETYPE_USER:
            $player2_user     = $memberHandler->getUser($row['player2_uid']);
            $player2_username = is_object($player2_user) ? $player2_user->getVar('uname') : '?';
            $label_gametype   = _MD_CHESS_LABEL_GAMETYPE_USER . ': ' . $player2_username;
            break;
        case _CHESS_GAMETYPE_SELF:
            $label_gametype = _MD_CHESS_LABEL_GAMETYPE_SELF;
            break;
        default:
            $label_gametype = _MD_CHESS_LABEL_ERROR;
            break;
    }

    $form->addElement(new XoopsFormLabel(_MD_CHESS_LABEL_GAMETYPE . ':', $label_gametype));

    $player1_user = $memberHandler->getUser($row['player1_uid']);

    $player1_username = is_object($player1_user) ? $player1_user->getVar('uname') : '?';

    $form->addElement(new XoopsFormLabel(_MD_CHESS_LABEL_CHALLENGER . ':', $player1_username));

    if (!empty($row['fen'])) {
        $form->addElement(new XoopsFormLabel(_MD_CHESS_LABEL_FEN_SETUP . ':', $row['fen']));
    }

    switch ($row['color_option']) {
        case _CHESS_COLOROPTION_OPPONENT:
            $label_coloroption = _MD_CHESS_RADIO_COLOR_OPPONENT;
            break;
        case _CHESS_COLOROPTION_RANDOM:
            $label_coloroption = _MD_CHESS_RADIO_COLOR_RANDOM;
            break;
        case _CHESS_COLOROPTION_WHITE:
            $label_coloroption = _MD_CHESS_RADIO_COLOR_WHITE;
            break;
        case _CHESS_COLOROPTION_BLACK:
            $label_coloroption = _MD_CHESS_RADIO_COLOR_BLACK;
            break;
        default:
            $label_coloroption = _MD_CHESS_LABEL_ERROR;
            break;
    }

    $form->addElement(new XoopsFormLabel(_MD_CHESS_LABEL_COLOR . ':', $label_coloroption));

    if ('none' != chess_moduleConfig('rating_system')) {
        $form->addElement(new XoopsFormLabel(_MD_CHESS_RATED_GAME . ':', $row['is_rated'] ? _YES : _NO));
    }

    // Display confirm-delete checkbox, initially unchecked.

    $checked_value = 1;

    $checkbox_confirm_delete = new XoopsFormCheckBox('', 'confirm_delete', !$checked_value);

    $checkbox_confirm_delete->addOption($checked_value, _MD_CHESS_CONFIRM_DELETE);

    $tray = new XoopsFormElementTray('');

    $tray->addElement(new XoopsFormButton('', 'submit_delete', _MD_CHESS_CREATE_DELETE, 'submit'));

    $tray->addElement($checkbox_confirm_delete);

    $form->addElement($tray);

    $form->display();
}

/**
 * Accept a challenge.
 *
 * @param int    $challenge_id        Challenge ID
 * @param string $coloroption         _CHESS_COLOROPTION_OPPONENT, _CHESS_COLOROPTION_RANDOM, _CHESS_COLOROPTION_WHITE or _CHESS_COLOROPTION_BLACK
 * @param bool   $notify_move_player2 If true, subscribe the accepter to receive a notification when a new move is made.
 * @throws \Exception
 */
function chess_accept_challenge($challenge_id, $coloroption, $notify_move_player2 = false)
{
    global $xoopsDB, $xoopsUser;

    $challenges_table = $xoopsDB->prefix('chess_challenges');

    $result = $xoopsDB->query(
        trim(
            "
        SELECT game_type, fen, color_option, notify_move_player1, player1_uid, player2_uid, UNIX_TIMESTAMP(create_date) as create_date, is_rated
        FROM   $challenges_table
        WHERE  challenge_id = '$challenge_id'
    "
        )
    );

    if ($xoopsDB->getRowsNum($result) < 1) {
        redirect_header(XOOPS_URL . '/modules/chess/', _CHESS_REDIRECT_DELAY_FAILURE, _MD_CHESS_GAME_NOT_FOUND);
    }

    $row = $xoopsDB->fetchArray($result);

    $xoopsDB->freeRecordSet($result);

    $uid = $xoopsUser ? $xoopsUser->getVar('uid') : 0;

    if (_CHESS_GAMETYPE_USER == $row['game_type'] && $uid != $row['player2_uid']) {
        redirect_header(XOOPS_URL . '/modules/chess/', _CHESS_REDIRECT_DELAY_FAILURE, _MD_CHESS_WRONG_PLAYER2);
    } elseif ($uid == $row['player1_uid']) {
        redirect_header(XOOPS_URL . '/modules/chess/', _CHESS_REDIRECT_DELAY_FAILURE, _MD_CHESS_SAME_PLAYER2);
    }

    switch ($row['color_option']) {
        case _CHESS_COLOROPTION_OPPONENT:
            switch ($coloroption) {
                default:
                case _CHESS_COLOROPTION_RANDOM:
                    if (1 == random_int(1, 2)) {
                        $white_uid = $row['player1_uid'];
                        $black_uid = $uid;
                    } else {
                        $white_uid = $uid;
                        $black_uid = $row['player1_uid'];
                    }
                    break;
                case _CHESS_COLOROPTION_WHITE:
                    $white_uid = $uid;
                    $black_uid = $row['player1_uid'];
                    break;
                case _CHESS_COLOROPTION_BLACK:
                    $white_uid = $row['player1_uid'];
                    $black_uid = $uid;
                    break;
            }
            break;
        default:
        case _CHESS_COLOROPTION_RANDOM:
            if (1 == random_int(1, 2)) {
                $white_uid = $row['player1_uid'];

                $black_uid = $uid;
            } else {
                $white_uid = $uid;

                $black_uid = $row['player1_uid'];
            }
            break;
        case _CHESS_COLOROPTION_WHITE:
            $white_uid = $row['player1_uid'];
            $black_uid = $uid;
            break;
        case _CHESS_COLOROPTION_BLACK:
            $white_uid = $uid;
            $black_uid = $row['player1_uid'];
            break;
    }

    $game_id = chess_create_game($white_uid, $black_uid, $row['fen'], $row['is_rated'], $row['notify_move_player1'] ? $row['player1_uid'] : 0, $notify_move_player2);

    $xoopsDB->query("DELETE FROM $challenges_table WHERE challenge_id = '$challenge_id'");

    if ($xoopsDB->errno()) {
        trigger_error($xoopsDB->errno() . ':' . $xoopsDB->error(), E_USER_ERROR);
    }

    // Notify player 1 that his challenge has been accepted (if he has subscribed to the notification).

    $player2_username = $xoopsUser ? $xoopsUser->getVar('uname') : '*unknown*';

    $notificationHandler = xoops_getHandler('notification');

    $extra_tags = ['CHESS_PLAYER' => $player2_username, 'CHESS_GAME_ID' => $game_id];

    $notificationHandler->triggerEvent('global', 0, 'notify_accept_challenge', $extra_tags, [$row['player1_uid']]);

The method triggerEvent() does not exist on XoopsObjectHandler. It seems like you code against a sub-type of XoopsObjectHandler such as XoopsNotificationHandler or XoopsPersistableObjectHandler.

    redirect_header(XOOPS_URL . "/modules/chess/game.php?game_id=$game_id", _CHESS_REDIRECT_DELAY_SUCCESS, _MD_CHESS_GAME_CREATED);
}

/**
 * Determine whether current user offered the specified challenge.
 *
 * @param int $challenge_id Challenge ID
 * @return bool
 */
function chess_is_challenger($challenge_id)
{
    global $xoopsDB, $xoopsUser;

    $challenges_table = $xoopsDB->prefix('chess_challenges');

    $result = $xoopsDB->query("SELECT player1_uid FROM $challenges_table WHERE challenge_id = '$challenge_id'");

    if ($xoopsDB->getRowsNum($result) < 1) {
        redirect_header(XOOPS_URL . '/modules/chess/', _CHESS_REDIRECT_DELAY_FAILURE, _MD_CHESS_GAME_NOT_FOUND);
    }

    $row = $xoopsDB->fetchArray($result);

    $xoopsDB->freeRecordSet($result);

    $uid = is_object($xoopsUser) ? $xoopsUser->getVar('uid') : 0;

    return $uid == $row['player1_uid'];
}

/**
 * Create a new challenge in the database.
 *
 * @param string $gametype            _CHESS_GAMETYPE_OPEN, _CHESS_GAMETYPE_USER or _CHESS_GAMETYPE_SELF
 * @param string $fen                 FEN setup
 * @param string $coloroption         _CHESS_COLOROPTION_OPPONENT, _CHESS_COLOROPTION_RANDOM, _CHESS_COLOROPTION_WHITE or _CHESS_COLOROPTION_BLACK
 * @param int    $rated               '1' if rated, '0' if not rated
 * @param bool   $notify_accept       Subscribe/unsubscribe the challenger for receiving a notification when the challenge is accepted.
 * @param bool   $notify_move_player1 If true, subscribe the challenger to receive a notification when a new move is made.
 * @param int    $opponent_uid        Opponent's user ID ('0' for open challenge)
 */
function chess_create_challenge($gametype, $fen, $coloroption, $rated, $notify_accept, $notify_move_player1, $opponent_uid = 0)
{
    #$where = __CLASS__ . '::' . __FUNCTION__;#*#DEBUG#

    #echo "In $where\n";#*#DEBUG#

    global $xoopsUser;

    $uid = is_object($xoopsUser) ? $xoopsUser->getVar('uid') : 0;

    $myts = MyTextSanitizer::getInstance();

    $fen_q = $myts->addSlashes($fen);

    #trigger_error("inserting new game'", E_USER_NOTICE);#*#DEBUG#

    global $xoopsDB;

    $table = $xoopsDB->prefix('chess_challenges');

    $xoopsDB->query(
        trim(
            "
        INSERT INTO $table
        SET
            game_type           = '$gametype',
            fen                 = '$fen_q',
            color_option        = '$coloroption',
            notify_move_player1 = '$notify_move_player1',
            player1_uid         = '$uid',
            player2_uid         = '$opponent_uid',
            create_date         = NOW(),
            is_rated            = '$rated'
    "
        )
    );

    if ($xoopsDB->errno()) {
        trigger_error($xoopsDB->errno() . ':' . $xoopsDB->error(), E_USER_ERROR);
    }

    $challenge_id = $xoopsDB->getInsertId();

    $notificationHandler = xoops_getHandler('notification');

    // Update the challenger's subscription for receiving a notification when the challenge is accepted.

    if ($notify_accept) {
        $notificationHandler->subscribe('global', 0, 'notify_accept_challenge');

The method subscribe() does not exist on XoopsObjectHandler. It seems like you code against a sub-type of XoopsObjectHandler such as XoopsNotificationHandler or XoopsPersistableObjectHandler.

    } else {
        $notificationHandler->unsubscribe('global', 0, 'notify_accept_challenge');

The method unsubscribe() does not exist on XoopsObjectHandler. It seems like you code against a sub-type of XoopsObjectHandler such as XoopsNotificationHandler or XoopsPersistableObjectHandler.

    }

    // Notify any subscribers that a challenge has been offered.

    $player1_username = $xoopsUser ? $xoopsUser->getVar('uname') : '*unknown*';

    $extra_tags = ['CHESS_CHALLENGER' => $player1_username, 'CHESS_CHALLENGE_ID' => $challenge_id];

    if (_CHESS_GAMETYPE_OPEN == $gametype) {
        $notificationHandler->triggerEvent('global', 0, 'notify_challenge_open', $extra_tags);
    } elseif (_CHESS_GAMETYPE_USER == $gametype) {
        $notificationHandler->triggerEvent('global', 0, 'notify_challenge_user', $extra_tags, [$opponent_uid]);
    }
}

/**
 * Delete a challenge from the database.
 *
 * @param int $challenge_id Challenge ID
 */
function chess_delete_challenge($challenge_id)
{
    global $xoopsDB;

    $table = $xoopsDB->prefix('chess_challenges');

    $xoopsDB->query("DELETE FROM $table WHERE challenge_id='$challenge_id'");

    if ($xoopsDB->errno()) {
        trigger_error($xoopsDB->errno() . ':' . $xoopsDB->error(), E_USER_ERROR);
    }
}

/**
 * Create a new game in the database.
 *
 * @param int    $white_uid               White's user ID
 * @param int    $black_uid               Black's user ID
 * @param string $fen                     FEN setup
 * @param int    $rated                   '1' if rated, '0' if not rated
 * @param int    $notify_move_player1_uid If nonzero, subscribe the challenger to receive a notification when a new move is made.
 * @param bool   $notify_move_player2     If true, subscribe the accepter to receive a notification when a new move is made.
 * @return int
 */
function chess_create_game($white_uid, $black_uid, $fen, $rated, $notify_move_player1_uid = 0, $notify_move_player2 = false)
{
    #$where = __CLASS__ . '::' . __FUNCTION__;#*#DEBUG#

    #echo "In $where\n";#*#DEBUG#

    #var_dump('white_uid', $white_uid, 'black_uid', $black_uid);#*#DEBUG#

    $chessgame = new Chess\ChessGame($fen);

    empty($chessgame->error) or trigger_error('chessgame invalid', E_USER_ERROR);

    $gamestate = $chessgame->gamestate();

    is_array($gamestate) or trigger_error('gamestate invalid', E_USER_ERROR);

    #trigger_error("inserting new game'", E_USER_NOTICE);#*#DEBUG#

    $myts = MyTextSanitizer::getInstance();

    $fen_q = $myts->addSlashes($fen);

    global $xoopsDB;

    $table = $xoopsDB->prefix('chess_games');

    $xoopsDB->query(
        trim(
            "
        INSERT INTO $table
        SET
            white_uid                    = '$white_uid',
            black_uid                    = '$black_uid',
            create_date                  = NOW(),
            start_date                   = '0000-00-00 00:00:00',
            last_date                    = '0000-00-00 00:00:00',
            fen_piece_placement          = '{$gamestate['fen_piece_placement']}',
            fen_active_color             = '{$gamestate['fen_active_color']}',
            fen_castling_availability    = '{$gamestate['fen_castling_availability']}',
            fen_en_passant_target_square = '{$gamestate['fen_en_passant_target_square']}',
            fen_halfmove_clock           = '{$gamestate['fen_halfmove_clock']}',
            fen_fullmove_number          = '{$gamestate['fen_fullmove_number']}',
            pgn_fen                      = '$fen_q',
            pgn_result                   = '{$gamestate['pgn_result']}',
            pgn_movetext                 = '{$gamestate['pgn_movetext']}',
            is_rated                     = '$rated'
    "
        )
    );

    if ($xoopsDB->errno()) {
        trigger_error($xoopsDB->errno() . ':' . $xoopsDB->error(), E_USER_ERROR);
    }

    $game_id = $xoopsDB->getInsertId();

    $notificationHandler = xoops_getHandler('notification');

    // If requested, subscribe the challenger to receive a notification when a new move is made.

    if ($notify_move_player1_uid) {
        $notificationHandler->subscribe('game', $game_id, 'notify_game_move', null, null, $notify_move_player1_uid);
    }

    // If requested, subscribe the accepter to receive a notification when a new move is made.

    if ($notify_move_player2) {
        $notificationHandler->subscribe('game', $game_id, 'notify_game_move');
    }

    return $game_id;
}

/**
 * Check whether a FEN setup is valid.
 *
 * @param string $fen FEN setup
 * @return string  Empty string if FEN setup is valid, otherwise contains error message.
 */
function chess_fen_error($fen)
{
    if (!empty($fen)) {
        $chessgame = new Chess\ChessGame($fen);

        $fen_error = $chessgame->error;
    } else {
        $fen_error = '';
    }

    return $fen_error;
}

/**
 * Get user ID of specified chess opponent.
 *
 * This function is used to check whether the specified opponent is available, when offering an individual challenge.
 *
 * @param string $username Opponent's username
 * @return int Opponent's user ID if opponent is registered and allowed to play chess, otherwise zero.
 */
function chess_opponent_uid($username)
{
    $uid = chess_uname_to_uid($username);

    $can_play = $uid > 0 ? chess_can_play($uid) : false;

    return $can_play ? $uid : 0;
}