<?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/>.

/**
 * Handles our own events to make some reactive changes, for example, update activity completion state (if completion is enabled).
 *
 * @copyright  2022 onwards Vitaly Potenko <potenkov@gmail.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

namespace mod_adaptivequiz;

use completion_info;
use core\event\base;

class attempt_state_change_observers {

    public static function attempt_completed(base $event): void {
        global $DB;

        // Update completion state if enabled.
        if (!$attempt = $event->get_record_snapshot('adaptivequiz_attempt', $event->objectid)) {
            return;
        }
        if (!$adaptivequiz = $DB->get_record('adaptivequiz', ['id' => $attempt->instance])) {
            return;
        }
        if (!$course = $DB->get_record('course', ['id' => $adaptivequiz->course])) {
            return;
        }

        $completion = new completion_info($course);
        if (!$completion->is_enabled()) {
            return;
        }
        if (!$adaptivequiz->completionattemptcompleted) {
            return;
        }
        if (!$cm = get_coursemodule_from_instance('adaptivequiz', $adaptivequiz->id, $adaptivequiz->course)) {
            return;
        }
        $completion->update_state($cm, COMPLETION_COMPLETE, $event->userid);
    }
}