<?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/>.

/**
 * The script supports book
 *
 * @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_once( "../headergame.php");
require_once("../locallib.php");

require_login($course->id, false, $cm);

$attempt = game_getattempt( $game, $detail);
if ($game->bookid == 0) {
    throw new moodle_exception( 'bookquiz_not_select_book', 'game');
}

if ($form = data_submitted()) {   // Filename.
    $ids = explode( ',', $form->ids);
    game_bookquiz_save( $game->id, $game->bookid, $ids, $form);
}

// Print upload form.
$OUTPUT->heading( $course->fullname);

$select = "gameid={$game->id}";
$categories = [];
if (($recs = $DB->get_records_select( 'game_bookquiz_questions', $select, null, '', 'chapterid,questioncategoryid')) != false) {
    foreach ($recs as $rec) {
        $categories[$rec->chapterid] = $rec->questioncategoryid;
    }
}

$context = game_get_context_course_instance( $COURSE->id);
$select = " contextid in ($context->id)";

$a = [];
if ($recs = $DB->get_records_select( 'question_categories', $select, null, 'id,name')) {
    foreach ($recs as $rec) {
        $s = $rec->name;
        if (($count = $DB->count_records( 'question', [ 'category' => $rec->id])) != 0) {
            $s .= " ($count)";
        }
        $a[$rec->id] = $s;
    }
}

$sql = "SELECT chapterid, COUNT(*) as c ".
    "FROM {game_bookquiz_questions} gbq,{question} q ".
    "WHERE gbq.questioncategoryid=q.category ".
    "AND gameid=$game->id ".
    "GROUP BY chapterid";
$numbers = [];
if (($recs = $DB->get_records_sql( $sql)) != false) {
    foreach ($recs as $rec) {
        $numbers[$rec->chapterid] = $rec->c;
    }
}

echo '<form name="form" method="post" action="questions.php">';
echo '<table border=1>';
echo '<tr>';
echo '<td><center>'.get_string( 'bookquiz_chapters', 'game').'</td>';
echo '<td><center>'.get_string( 'bookquiz_categories', 'game').'</td>';
echo '<td><center>'.get_string( 'bookquiz_numquestions', 'game').'</td>';
echo "</tr>\r\n";
$ids = '';
if (($recs = $DB->get_records( 'book_chapters', [ 'bookid' => $game->bookid], 'pagenum', 'id,title')) != false) {
    foreach ($recs as $rec) {
        echo '<tr>';
        echo '<td>'.$rec->title.'</td>';
        echo '<td>';
        if (array_key_exists( $rec->id, $categories)) {
            $categoryid = $categories[$rec->id];
        } else {
            $categoryid = 0;
        }
        echo game_showselectcontrol( 'categoryid_'.$rec->id, $a, $categoryid, '');
        echo '</td>';

        echo '<td>';
        if (array_key_exists( $rec->id, $numbers)) {
            echo '<center>'.$numbers[$rec->id].'</center>';
        } else {
            echo '&nbsp;';
        }
        echo '</td>';

        echo "</tr>\r\n";

        $ids .= ','.$rec->id;
    }
}
?>
</table>
<br>
<!-- These hidden variables are always the same -->
<input type="hidden" name=id       value="<?php  p($id) ?>" />
<input type="hidden" name=q       value="<?php  p($q) ?>" />
<input type="hidden" name=ids       value="<?php  p( substr( $ids, 1)) ?>" />
<center>
<input type="submit" value="<?php  print_string("savechanges") ?>" />
</center>

</form>
<?php

echo $OUTPUT->footer($course);

/**
 * Save infos to database.
 *
 * @param int $gameid
 * @param int $bookid
 * @param array $ids
 * @param stdClass $form
 */
function game_bookquiz_save( $gameid, $bookid, $ids, $form) {
    global $DB;

    $questions = $recids = [];
    if (($recs = $DB->get_records( 'game_bookquiz_questions',
        [ 'gameid' => $gameid], '', 'id,chapterid,questioncategoryid')) != false) {
        foreach ($recs as $rec) {
            $questions[$rec->chapterid] = $rec->questioncategoryid;
            $recids[$rec->chapterid] = $rec->id;
        }
    }

    foreach ($ids as $chapterid) {
        $name = 'categoryid_'.$chapterid;
        $categoryid = $form->$name;

        if (!array_key_exists( $chapterid, $questions)) {
            if ($categoryid == 0) {
                continue;
            }

            $rec = new stdClass();
            $rec->gameid = $gameid;
            $rec->chapterid = $chapterid;
            $rec->questioncategoryid = $categoryid;

            if (($newid = $DB->insert_record('game_bookquiz_questions', $rec)) == false) {
                throw new moodle_exception( 'bookquiz_error', 'game', 'Can\'t insert to game_bookquiz_questions');
            }
            continue;
        }

        $cat = $questions[$chapterid];
        if ($cat == $categoryid) {
            $recids[$chapterid] = 0;
            continue;
        }

        if ($categoryid == 0) {
            if (!delete_records( 'game_bookquiz_questions', 'id', $recids[$chapterid])) {
                throw new moodle_exception( 'bookquiz_error', 'game', 'Can\'t delete game_bookquiz_questions');
            }
        } else {
            $updrec = new StdClass;
            $updrec->id = $recids[$chapterid];
            $updrec->questioncategoryid = $categoryid;
            if (($DB->update_record( 'game_bookquiz_questions', $updrec)) == false) {
                throw new moodle_exception( 'bookquiz_error', 'game', 'Can\'t update game_bookquiz_questions');
            }
        }

        $recids[$chapterid] = 0;
    }

    foreach ($recids as $chapterid => $id) {
        if ($id == 0) {
            continue;
        }
    }
}
