<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle 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 3 of the License, or
// (at your option) any later version.
//
// Moodle 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 Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * This page shows the answers of the current game
 *
 * @package    mod_game
 * @copyright  2007 Vasilis Daloukas
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
require_once("../../config.php");

require_login();

require_once( "headergame.php");

if (!has_capability('mod/game:viewreports', $context)) {
    throw new moodle_exception( 'only_teachers', 'game');
}

$PAGE->navbar->add(get_string('showattempts', 'game'));

$action = optional_param('action', "", PARAM_ALPHANUM);  // Action.
if ($action == 'delete') {
    game_ondeleteattempt( $game);
}

echo get_string( 'group').': ';
game_showgroups( $game);
echo ' &nbsp; '.get_string('user').': ';
game_showusers( $game);echo '<br><br>';

game_showattempts( $game);

echo $OUTPUT->footer();

/**
 * Show users
 *
 * @param stdClass $game
 */
function game_showusers($game) {
    global $CFG, $USER, $DB;

    $users = [];

    $context = game_get_context_course_instance( $game->course);

    $groupid = optional_param('groupid', 0, PARAM_INT);
    $sql = "SELECT DISTINCT ra.userid,u.lastname,u.firstname FROM {role_assignments} ra, {user} u ".
        " WHERE ra.contextid={$context->id} AND ra.userid=u.id";
    if ($groupid != 0) {
        $sql .= " AND ra.userid IN (SELECT gm.userid FROM {groups_members} gm WHERE gm.groupid=$groupid)";
    }
    if (($recs = $DB->get_records_sql( $sql))) {
        foreach ($recs as $rec) {
            $users[$rec->userid] = $rec->lastname.' '.$rec->firstname;
        }
    }

    if ($guest = guest_user()) {
        $users[$guest->id] = fullname($guest);
    }
    $href = $CFG->wwwroot.'/mod/game/showattempts.php?q='.$game->id.'&userid=';
?>
            <script type="text/javascript">
                function onselectuser()
                {
                    var groupid = document.getElementById('menugroup').value;
                    window.location.href = "<?php echo $href;?>" + document.getElementById('menuuser').value + '&groupid='+groupid;
                }
            </script>
    <?php

    $attributes = 'onchange="javascript:onselectuser();"';
    $name = 'user';
    $id = 'menu'.$name;
    $class = 'menu'.$name;
    $class = 'select ' . $class; // Add 'select' selector always.
    $nothing = get_string("allparticipants");
    $nothingvalue = '0';
    $options = $users;
    $selected = optional_param('userid', 0, PARAM_INT);

    $output = '<select id="'. $id .'" class="'. $class .'" name="'. $name .'" '. $attributes .'>' . "\n";
    $output .= '   <option value="'. s($nothingvalue) .'"'. "\n";
    if ($nothingvalue === $selected) {
        $output .= ' selected="selected"';
    }
    $output .= '>'. $nothing .'</option>' . "\n";

    if (!empty($options)) {
        foreach ($options as $value => $label) {
            $output .= '   <option value="'. s($value) .'"';
            if ((string)$value == (string)$selected ||
                (is_array($selected) && in_array($value, $selected))) {
                $output .= ' selected="selected"';
            }
            if ($label === '') {
                $output .= '>'. $value .'</option>' . "\n";
            } else {
                $output .= '>'. $label .'</option>' . "\n";
            }
        }
    }
    echo $output . '</select>' . "\n";
}

/**
 * Show groups
 *
 * @param stdClass $game
 */
function game_showgroups($game) {
    global $CFG, $USER, $DB;

    $groups = [];
    if (($recs = $DB->get_records_sql( "SELECT id,name FROM {groups} WHERE courseid=$game->course ORDER BY name"))) {
        foreach ($recs as $rec) {
            $groups[$rec->id] = $rec->name;
        }
    }
    $href = $CFG->wwwroot.'/mod/game/showattempts.php?q='.$game->id.'&groupid=';
?>
            <script type="text/javascript">
                function onselectgroup()
                {
                    window.location.href = "<?php echo $href;?>" + document.getElementById('menugroup').value;
                }
            </script>
    <?php

    $attributes = 'onchange="javascript:onselectgroup();"';
    $name = 'group';
    $id = 'menu'.$name;
    $class = 'menu'.$name;
    $class = 'select ' . $class; // Add 'select' selector always.
    $nothing = get_string("allgroups");
    $nothingvalue = '0';
    $options = $groups;
    $selected = optional_param('groupid', 0, PARAM_INT);

    $output = '<select id="'. $id .'" class="'. $class .'" name="'. $name .'" '. $attributes .'>' . "\n";
    $output .= '   <option value="'. $nothingvalue .'"'. "\n";
    if ($nothingvalue === $selected) {
        $output .= ' selected="selected"';
    }
    $output .= '>'. $nothing .'</option>' . "\n";

    if (!empty($options)) {
        foreach ($options as $value => $label) {
            $output .= '   <option value="'. s($value) .'"';
            if ((string)$value == (string)$selected ||
                (is_array($selected) && in_array($value, $selected))) {
                $output .= ' selected="selected"';
            }
            if ($label === '') {
                $output .= '>'. $value .'</option>' . "\n";
            } else {
                $output .= '>'. $label .'</option>' . "\n";
            }
        }
    }
    echo $output . '</select>' . "\n";
}

/**
 * Show attempts
 *
 * @param stdClass $game
 */
function game_showattempts($game) {
    global $CFG, $DB, $OUTPUT, $context;

    $allowdelete = has_capability('mod/game:manage', $context);

    $userid = optional_param('userid', 0, PARAM_INT);
    $limitfrom = optional_param('limitfrom',  0, PARAM_INT);
    $gamekind = $game->gamekind;
    $update = get_coursemodule_from_instance( 'game', $game->id, $game->course)->id;

    // Here are user attempts.
    $table = "{game_attempts} as ga, {user} u, {game} as g";
    $select = "ga.userid=u.id AND ga.gameid={$game->id} AND g.id={$game->id}";
    $fields = "ga.id, u.lastname, u.firstname, ga.attempts,".
        "timestart, timefinish, timelastattempt, ga.score";
    if ($userid != 0) {
        $select .= ' AND u.id='.$userid;
    }
    $sql = "SELECT COUNT(*) AS c FROM $table WHERE $select";
    $count = $DB->count_records_sql( $sql);
    $maxlines = 20;
    $recslimitfrom = $recslimitnum = '';
    if ($count > $maxlines) {
        $recslimitfrom = ( $limitfrom ? $limitfrom * $maxlines : '');
        $recslimitnum = $maxlines;

        for ($i = 0; $i * $maxlines < $count; $i++) {
            if ($i == $limitfrom) {
                echo ($i + 1).' ';
            } else {
                echo "<a href=\"{$CFG->wwwroot}/mod/game/showattempts.php?q={$game->id}&amp;limitfrom=$i&\">".($i + 1)."</a>";
                echo ' &nbsp;';
            }
        }
        echo "<br>";
    }

    $sql = "SELECT $fields FROM $table WHERE $select ORDER BY timelastattempt DESC,timestart DESC";
    if (($recs = $DB->get_records_sql( $sql, null, $recslimitfrom, $recslimitnum)) != false) {
        echo '<table border="1">';
        echo '<tr><td><b>'.get_string( 'delete').'</td><td><b>'.get_string('user').'</td>';
        echo '<td><b>'.get_string('timestart', 'game').'</b></td>';
        echo '<td><b>'.get_string('timelastattempt', 'game').'</b></td>';
        echo '<td><b>'.get_string('timefinish', 'game').'</b></td>';
        echo '<td><b>'.get_string('score', 'game').'</b></td>';
        echo '<td><b>'.get_string('attempts', 'game').'</b></td>';
        echo '<td><b>'.get_string('preview', 'game').'</b></td>';
        echo '<td><b>'.get_string('showsolution', 'game').'</b></td>';
        echo "</tr>\r\n";

        foreach ($recs as $rec) {
            echo '<tr>';
            echo '<td><center>';
            if (($rec->timefinish == 0) || $allowdelete) {
                echo "\r\n<a href=\"{$CFG->wwwroot}/mod/game/showattempts.php?attemptid={$rec->id}";
                echo "&amp;q={$game->id}&amp;action=delete";
                if ($allowdelete) {
                    echo '&allowdelete=1';
                }
                echo '">';
                echo '<img src="'.game_pix_url('t/delete').'" alt="'.get_string( 'delete').'" /></a>';
            }
            echo '</center></td>';
            echo '<td><center>'.$rec->firstname. ' '.$rec->lastname.'</center></td>';
            echo '<td><center>'.( $rec->timestart != 0 ? userdate($rec->timestart) : '')."</center></td>\r\n";
            echo '<td><center>'.( $rec->timelastattempt != 0 ? userdate($rec->timelastattempt) : '').'</center></td>';
            echo '<td><center>'.( $rec->timefinish != 0 ? userdate($rec->timefinish) : '').'</center></td>';
            echo '<td><center>'.round($rec->score * 100).'</center></td>';
            echo '<td><center>'.$rec->attempts.'</center></td>';
            echo '<td><center>';

            // Preview.
            if (($gamekind == 'cross') || ($gamekind == 'sudoku') || ($gamekind == 'hangman') || ($gamekind == 'cryptex')) {
                echo "\r\n<a href=\"{$CFG->wwwroot}/mod/game/preview.php?action=preview&amp;";
                echo "attemptid={$rec->id}&amp;gamekind=$gamekind";
                echo '&amp;update='.$update."&amp;q={$game->id}\">";
                echo '<img src="'.game_pix_url('t/preview').'" alt="'.get_string( 'preview', 'game').'" /></a>';
            }
            echo '</center></td>';

            // Show the solution.
            echo '<td><center>';
            if (($gamekind == 'cross') || ($gamekind == 'sudoku') || ($gamekind == 'hangman') || ($gamekind == 'cryptex') ) {
                echo "\r\n<a href=\"{$CFG->wwwroot}/mod/game/preview.php?action=solution&amp;".
                    "attemptid={$rec->id}&amp;gamekind={$gamekind}&amp;update=$update&amp;&amp;".
                    "q={$game->id}\">";
                echo '<img src="'.game_pix_url('t/preview').'" alt="'.get_string( 'showsolution', 'game').'" /></a>';
            }
            echo '</center></td>';
            echo "</tr>\r\n";
        }
        echo "</table>\r\n";
    }
}

/**
 * One delete attempt
 *
 * @param stdClass $game
 */
function game_ondeleteattempt( $game) {
    global $CFG, $DB;

    $attemptid = required_param('attemptid', PARAM_INT);

    $attempt = $DB->get_record( 'game_attempts', [ 'id' => $attemptid]);

    switch( $game->gamekind) {
        case 'bookquiz':
            $DB->delete_records( 'game_bookquiz_chapters', [ 'attemptid' => $attemptid]);
            break;
    }
    $DB->delete_records( 'game_queries', [ 'attemptid' => $attemptid]);
    $DB->delete_records( 'game_attempts', [ 'id' => $attemptid]);
}
