<?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/>.

namespace core\event;

/**
 * Section viewed event class.
 *
 * @package    core
 * @copyright  2023 Amaia Anabitarte <amaia@moodle.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class section_viewed extends base {

    /**
     * Init method.
     *
     * @return void
     */
    protected function init() {
        $this->data['objecttable'] = 'course_sections';
        $this->data['crud'] = 'r';
        $this->data['edulevel'] = self::LEVEL_PARTICIPATING;
    }

    /**
     * Returns non-localised description of what happened.
     *
     * @return string
     */
    public function get_description() {
        return "The user with id '$this->userid' viewed the section with id '$this->objectid'.";
    }

    /**
     * Return localised event name.
     *
     * @return string
     */
    public static function get_name() {
        return get_string('eventsectionviewed', 'core');
    }

    /**
     * Get URL related to the action.
     *
     * @return \moodle_url|null
     */
    public function get_url() {
        global $CFG, $DB;
        require_once($CFG->dirroot . '/course/lib.php');
        try {
            $section = $DB->get_record($this->objecttable, ['id' => $this->objectid], '*', MUST_EXIST);
            return course_get_url($this->courseid, $section, ['navigation' => true]);
        } catch (\Exception $e) {
            return null;
        }
    }

    /**
     * Custom validation.
     *
     * @throws \coding_exception
     * @return void
     */
    protected function validate_data() {
        parent::validate_data();

        if ($this->contextlevel != CONTEXT_COURSE) {
            throw new \coding_exception('Context level must be CONTEXT_COURSE.');
        }
    }

    /**
     * Used for mapping events on restore
     *
     * @return bool
     */
    public static function get_other_mapping() {
        // No mapping required.
        return false;
    }
}