#Gocha#

<?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 used in this plugin
 *
 * @package    enrol_auto
 * @copyright  Eugene Venter <eugene@catalyst.net.nz>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

namespace enrol_auto;

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

require_once($CFG->dirroot . '/enrol/locallib.php');
require_once($CFG->dirroot . '/enrol/auto/lib.php');

/**
 * Event observer for enrol_auto.
 */
class observer {

/**
     * Triggered via course_module_viewed event of a module.
     *
     * @param stdClass $event
     */
    public static function course_module_viewed($event) {
        global $DB;

$eventdata = $event->get_data();

if (!enrol_is_enabled('auto')) {
            return;
        }

if (is_siteadmin($eventdata['userid'])) {
            // Don't enrol site admins
            return;
        }

$autoplugin = enrol_get_plugin('auto');

if ((!$instance = $autoplugin->get_instance_for_course($eventdata['courseid']))
                || $instance->status == ENROL_INSTANCE_DISABLED) {
            return;
        }

if ($instance->customint3 != ENROL_AUTO_MOD_VIEWED || empty($instance->customtext2)) {
            // nothing to see here :D
            return;
        }

$enabledmods = explode(',', $instance->customtext2);
        $modname = str_replace('mod_', '', $eventdata['component']);
        if (!in_array($modname, $enabledmods)) {
            return;
        }

if (!$DB->record_exists('user_enrolments', array('enrolid' => $instance->id, 'userid' => $eventdata['userid']))) {
            $autoplugin->enrol_user($instance, $eventdata['userid'], $instance->roleid);

if ($instance->customint2) {
                self::schedule_welcome_email($instance, $eventdata['userid']);
            }
        }
    }

/**
     * Triggered via the user_loggedin event, when a user logs in.
     *
     * @param stdClass $event
     */
    public static function user_loggedin($event) {
        global $DB;

$eventdata = $event->get_data();

if (!enrol_is_enabled('auto')) {
            return;
        }

if (is_siteadmin($eventdata['userid'])) {
            // Don't enrol site admins
            return;
        }

// Get all courses that have an auto enrol plugin, set to auto enrol on login, where the user isn't enrolled yet
        $sql = "SELECT e.courseid
            FROM {enrol} e
            LEFT JOIN {user_enrolments} ue ON e.id = ue.enrolid AND ue.userid = ?
            WHERE e.enrol = 'auto'
            AND e.status = ?
            AND e.customint3 = ?
            AND ue.id IS NULL";
        if (!$courses = $DB->get_records_sql($sql, array($eventdata['userid'], ENROL_INSTANCE_ENABLED, ENROL_AUTO_LOGIN))) {
            return;
        }

$autoplugin = enrol_get_plugin('auto');
        foreach ($courses as $course) {
            if (!$instance = $autoplugin->get_instance_for_course($course->courseid)) {
                continue;
            }

$autoplugin->enrol_user($instance, $eventdata['userid'], $instance->roleid);

if ($instance->customint2) {
                self::schedule_welcome_email($instance, $eventdata['userid']);
            }

}
    }

public static function schedule_welcome_email($instance, $userid) {
        global $DB;

$user = $DB->get_record('user', array('id' => $userid));
        if (empty($user)) {
            // wat?
            return false;
        }

// Schedule welcome message task.
        $emailtask = new \enrol_auto\task\course_welcome_email();
        // add custom data
        $emailtask->set_custom_data(array(
            'user' => $user,
            'instance' => $instance
        ));
        // queue it
        \core\task\manager::queue_adhoc_task($emailtask);
    }
}