<?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/>.

/**
 * Event observers supported by this format.
 * @package    format_tiles
 * @copyright  2018 David Watson {@link http://evolutioncode.uk}
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

defined('MOODLE_INTERNAL') || die();

/**
 * Event observers supported by this format.
 * @package    format_tiles
 * @copyright  2018 David Watson {@link http://evolutioncode.uk}
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class format_tiles_observer {
    /**
     * Observer for the event course_content_deleted.
     * Deletes the user preference entries for the given course upon course deletion.
     * @param \core\event\course_deleted $event
     * @throws dml_exception
     */
    public static function course_deleted(\core\event\course_deleted $event) {
        global $DB;
        $courseid = $event->objectid;
        $DB->delete_records("user_preferences", array("name" => 'format_tiles_stopjsnav_' . $courseid));
    }

    /**
     * When a section is deleted, delete its tile photo if it has one.
     * @param \core\event\course_section_deleted $event
     */
    public static function course_section_deleted(\core\event\course_section_deleted $event) {
        \format_tiles\tile_photo::delete_file_from_ids($event->courseid, $event->objectid);
    }
}