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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 bulk operation for the manual enrolment plugin to edit selected users.
 *
 * @package enrol_self
 * @copyright 2018 Farhan Karmali
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

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

/**
     * Returns the title to display for this bulk operation.
     *
     * @return string
     */
    public function get_title() {
        return get_string('editselectedusers', 'enrol_self');
    }

/**
     * Returns the identifier for this bulk operation. This is the key used when the plugin
     * returns an array containing all of the bulk operations it supports.
     */
    public function get_identifier() {
        return 'editselectedusers';
    }

/**
     * Processes the bulk operation request for the given userids with the provided properties.
     *
     * @param course_enrolment_manager $manager
     * @param array $users
     * @param stdClass $properties The data returned by the form.
     */
    public function process(course_enrolment_manager $manager, array $users, stdClass $properties) {
        global $DB, $USER;

if (!has_capability("enrol/self:manage", $manager->get_context())) {
            return false;
        }

// Get all of the user enrolment id's.
        $ueids = array();
        $instances = array();
        foreach ($users as $user) {
            foreach ($user->enrolments as $enrolment) {
                $ueids[] = $enrolment->id;
                if (!array_key_exists($enrolment->id, $instances)) {
                    $instances[$enrolment->id] = $enrolment;
                }
            }
        }

// Check that each instance is manageable by the current user.
        foreach ($instances as $instance) {
            if (!$this->plugin->allow_manage($instance)) {
                return false;
            }
        }

// Collect the known properties.
        $status = $properties->status;
        $timestart = $properties->timestart;
        $timeend = $properties->timeend;

list($ueidsql, $params) = $DB->get_in_or_equal($ueids, SQL_PARAMS_NAMED);

$updatesql = array();
        if ($status == ENROL_USER_ACTIVE || $status == ENROL_USER_SUSPENDED) {
            $updatesql[] = 'status = :status';
            $params['status'] = (int)$status;
        }
        if (!empty($timestart)) {
            $updatesql[] = 'timestart = :timestart';
            $params['timestart'] = (int)$timestart;
        }
        if (!empty($timeend)) {
            $updatesql[] = 'timeend = :timeend';
            $params['timeend'] = (int)$timeend;
        }
        if (empty($updatesql)) {
            return true;
        }

// Update the modifierid.
        $updatesql[] = 'modifierid = :modifierid';
        $params['modifierid'] = (int)$USER->id;

// Update the time modified.
        $updatesql[] = 'timemodified = :timemodified';
        $params['timemodified'] = time();

// Build the SQL statement.
        $updatesql = join(', ', $updatesql);
        $sql = "UPDATE {user_enrolments}
                   SET $updatesql
                 WHERE id $ueidsql";

if ($DB->execute($sql, $params)) {
            foreach ($users as $user) {
                foreach ($user->enrolments as $enrolment) {
                    $enrolment->courseid  = $enrolment->enrolmentinstance->courseid;
                    $enrolment->enrol     = 'self';
                    // Trigger event.
                    $event = \core\event\user_enrolment_updated::create(
                        array(
                            'objectid' => $enrolment->id,
                            'courseid' => $enrolment->courseid,
                            'context' => context_course::instance($enrolment->courseid),
                            'relateduserid' => $user->id,
                            'other' => array('enrol' => 'self')
                        )
                    );
                    $event->trigger();
                }
            }
            // Delete cached course contacts for this course because they may be affected.
            cache::make('core', 'coursecontacts')->delete($manager->get_context()->instanceid);
            return true;
        }

return false;
    }

/**
     * Returns a enrol_bulk_enrolment_operation extension form to be used
     * in collecting required information for this operation to be processed.
     *
     * @param string|moodle_url|null $defaultaction
     * @param mixed $defaultcustomdata
     * @return enrol_self_editselectedusers_form
     */
    public function get_form($defaultaction = null, $defaultcustomdata = null) {
        return new enrol_self_editselectedusers_form($defaultaction, $defaultcustomdata);
    }
}