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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/>.

/**
 * The mod_assign extension granted event.
 *
 * @package    mod_assign
 * @copyright  2013 Frédéric Massart
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

namespace mod_assign\event;

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

/**
 * The mod_assign extension granted event class.
 *
 * @package    mod_assign
 * @since      Moodle 2.6
 * @copyright  2013 Frédéric Massart
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class extension_granted extends base {
    /**
     * Flag for prevention of direct create() call.
     * @var bool
     */
    protected static $preventcreatecall = true;

/**
     * Create instance of event.
     *
     * @since Moodle 2.7
     *
     * @param \assign $assign
     * @param int $userid
     * @return extension_granted
     */
    public static function create_from_assign(\assign $assign, $userid) {
        $data = array(
            'context' => $assign->get_context(),
            'objectid' => $assign->get_instance()->id,
            'relateduserid' => $userid,
        );
        self::$preventcreatecall = false;
        /** @var extension_granted $event */
        $event = self::create($data);
        self::$preventcreatecall = true;
        $event->set_assign($assign);
        return $event;
    }

/**
     * Returns description of what happened.
     *
     * @return string
     */
    public function get_description() {
        return "The user with id '$this->userid' has granted an extension for the user with id '$this->relateduserid' " .
            "for the assignment with course module id '$this->contextinstanceid'.";
    }

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

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

/**
     * Return legacy data for add_to_log().
     *
     * @return array
     */
    protected function get_legacy_logdata() {
        $this->set_legacy_logdata('grant extension', $this->relateduserid);
        return parent::get_legacy_logdata();
    }

/**
     * Custom validation.
     *
     * @throws \coding_exception
     * @return void
     */
    protected function validate_data() {
        if (self::$preventcreatecall) {
            throw new \coding_exception('cannot call extension_granted::create() directly, use extension_granted::create_from_assign() instead.');
        }

parent::validate_data();

if (!isset($this->relateduserid)) {
            throw new \coding_exception('The \'relateduserid\' must be set.');
        }
    }

public static function get_objectid_mapping() {
        return array('db' => 'assign', 'restore' => 'assign');
    }
}