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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/>.

/**
 * A scheduled task.
 *
 * @package    core
 * @copyright  2013 onwards Martin Dougiamas  http://dougiamas.com
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
namespace core\task;

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

require_once($CFG->dirroot . '/calendar/lib.php');

/**
 * Simple task to run the calendar cron.
 */
class calendar_cron_task extends scheduled_task {

/**
     * Get a descriptive name for this task (shown to admins).
     *
     * @return string
     */
    public function get_name() {
        return get_string('taskcalendarcron', 'admin');
    }

/**
     * Do the job.
     * Throw exceptions on errors (the job will be retried).
     */
    public function execute() {
        global $CFG, $DB;

require_once($CFG->libdir . '/bennu/bennu.inc.php');

$time = time();
        $sql = "SELECT *
                  FROM {event_subscriptions}
                 WHERE pollinterval > 0
                   AND lastupdated + pollinterval < :time";
        $subscriptions = $DB->get_records_sql($sql, array('time' => $time));
        foreach ($subscriptions as $sub) {
            mtrace("Updating calendar subscription {$sub->name} in course {$sub->courseid}");
            try {
                $log = calendar_update_subscription_events($sub->id);
                mtrace(trim(strip_tags($log)));
            } catch (\moodle_exception $ex) {
                mtrace('Error updating calendar subscription: ' . $ex->getMessage());
            }
        }

return true;
    }

}