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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/>.

/**
 * Contains class used to return information to display for the message popup.
 *
 * @package    message_popup
 * @copyright  2016 Ryan Wyllie <ryan@moodle.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

namespace message_popup;

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

/**
 * Class used to return information to display for the message popup.
 *
 * @copyright  2016 Ryan Wyllie <ryan@moodle.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class api {
    /**
     * Get popup notifications for the specified users. Nothing is returned if notifications are disabled.
     *
     * @param int $useridto the user id who received the notification
     * @param string $sort the column name to order by including optionally direction
     * @param int $limit limit the number of result returned
     * @param int $offset offset the result set by this amount
     * @return array notification records
     * @throws \moodle_exception
     * @since 3.2
     */
    public static function get_popup_notifications($useridto = 0, $sort = 'DESC', $limit = 0, $offset = 0) {
        global $DB, $USER;

$sort = strtoupper($sort);
        if ($sort != 'DESC' && $sort != 'ASC') {
            throw new \moodle_exception('invalid parameter: sort: must be "DESC" or "ASC"');
        }

if (empty($useridto)) {
            $useridto = $USER->id;
        }

// Is notification enabled ?
        if ($useridto == $USER->id) {
            $disabled = $USER->emailstop;
        } else {
            $user = \core_user::get_user($useridto, "emailstop", MUST_EXIST);
            $disabled = $user->emailstop;
        }
        if ($disabled) {
            // Notifications are disabled.
            return array();
        }

$sql = "SELECT n.id, n.useridfrom, n.useridto,
                       n.subject, n.fullmessage, n.fullmessageformat,
                       n.fullmessagehtml, n.smallmessage, n.contexturl,
                       n.contexturlname, n.timecreated, n.component,
                       n.eventtype, n.timeread, n.customdata
                  FROM {notifications} n
                 WHERE n.id IN (SELECT notificationid FROM {message_popup_notifications})
                   AND n.useridto = ?
              ORDER BY timecreated $sort, timeread $sort, id $sort";

$notifications = [];
        $records = $DB->get_recordset_sql($sql, [$useridto], $offset, $limit);
        foreach ($records as $record) {
            $notifications[] = (object) $record;
        }
        $records->close();

return $notifications;
    }

/**
     * Count the unread notifications for a user.
     *
     * @param int $useridto the user id who received the notification
     * @return int count of the unread notifications
     * @since 3.2
     */
    public static function count_unread_popup_notifications($useridto = 0) {
        global $USER, $DB;

if (empty($useridto)) {
            $useridto = $USER->id;
        }

return $DB->count_records_sql(
            "SELECT count(id)
               FROM {notifications}
              WHERE id IN (SELECT notificationid FROM {message_popup_notifications})
                AND useridto = ?
                AND timeread is NULL",
            [$useridto]
        );
    }
}