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<?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/>.

/**
 * Course module viewed event.
 *
 * @package    core
 * @copyright  2013 onwards Ankit Agarwal
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

namespace core\event;
defined('MOODLE_INTERNAL') || die();

/**
 * Abstract Course module viewed event class.
 *
 * Class for event to be triggered when a course module is viewed.
 *
 * @package    core
 * @since      Moodle 2.7
 * @copyright  2013 onwards Ankit Agarwal
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
abstract class course_module_viewed extends base {

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

/**
     * Returns description of what happened.
     *
     * @return string
     */
    public function get_description() {
        return "The user with id '$this->userid' viewed the '{$this->objecttable}' activity with " .
            "course module id '$this->contextinstanceid'.";
    }

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

/**
     * Get URL related to the action.
     *
     * @return \moodle_url
     */
    public function get_url() {
        return new \moodle_url("/mod/$this->objecttable/view.php", array('id' => $this->contextinstanceid));
    }

/**
     * Return the legacy event log data.
     *
     * @return array|null
     */
    protected function get_legacy_logdata() {
        return array($this->courseid, $this->objecttable, 'view', 'view.php?id=' . $this->contextinstanceid, $this->objectid,
                     $this->contextinstanceid);
    }

/**
     * Custom validation.
     *
     * @throws \coding_exception
     * @return void
     */
    protected function validate_data() {
        parent::validate_data();
        // Make sure this class is never used without proper object details.
        if (empty($this->objectid) || empty($this->objecttable)) {
            throw new \coding_exception('The course_module_viewed event must define objectid and object table.');
        }
        // Make sure the context level is set to module.
        if ($this->contextlevel != CONTEXT_MODULE) {
            throw new \coding_exception('Context level must be CONTEXT_MODULE.');
        }
    }
}