<?php
/**
 * send_mail_notifications.php - Sends daily email notifications.
 *
 * @author  André Noack <noack@data-quest.de>, Suchi & Berg GmbH <info@data-quest.de>
 * @author  Jan-Hendrik Willms <tleilax+studip@gmail.com>
 * @access  public
 */

// +---------------------------------------------------------------------------+
// This file is part of Stud.IP
// send_mail_notifications.php
//
// Copyright (C) 2013 Jan-Hendrik Willms <tleilax+studip@gmail.com>
// +---------------------------------------------------------------------------+
// This program 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 2
// of the License, or any later version.
// +---------------------------------------------------------------------------+
// This program 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 this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
// +---------------------------------------------------------------------------+


// TODO: notifications for plugins not implemented

class SendMailNotificationsJob extends CronJob
{
    /**
     * Returns the name of the cronjob.
     */
    public static function getName()
    {
        return _('Versendet tägliche E-Mailbenachrichtigungen');
    }

    /**
     * Returns the description of the cronjob.
     */
    public static function getDescription()
    {
        return _('Versendet die täglichen E-Mailbenachrichtigungen an alle Nutzer, die diese aktiviert haben');
    }

    /**
     * Setup method. Loads neccessary classes and checks environment. Will
     * bail out with an exception if environment does not match requirements.
     */
    public function setUp()
    {
        require_once 'lib/dates.inc.php';

        if (!Config::get()->MAIL_NOTIFICATION_ENABLE) {
            throw new Exception('Mail notifications are disabled in this Stud.IP installation.');
        }
        if (empty($GLOBALS['ABSOLUTE_URI_STUDIP'])) {
            throw new Exception('To use mail notifications you MUST set correct values for $ABSOLUTE_URI_STUDIP in config_local.inc.php!');
        }
    }

    /**
     * Return the paremeters for this cronjob.
     *
     * @return Array Parameters.
     */
    public static function getParameters()
    {
        return [
            'verbose' => [
                'type'        => 'boolean',
                'default'     => false,
                'status'      => 'optional',
                'description' => _('Sollen Ausgaben erzeugt werden (sind später im Log des Cronjobs sichtbar)'),
            ],
        ];
    }

    /**
     * Executes the cronjob.
     *
     * @param mixed $last_result What the last execution of this cronjob
     *                           returned.
     * @param Array $parameters Parameters for this cronjob instance which
     *                          were defined during scheduling.
     *                          Only valid parameter at the moment is
     *                          "verbose" which toggles verbose output while
     *                          purging the cache.
     */
    public function execute($last_result, $parameters = [])
    {
        $cli_user = $GLOBALS['user'];

        $notification = new ModulesNotification();

        $query = "SELECT DISTINCT user_id
                  FROM seminar_user_notifications
                  JOIN seminar_user USING (user_id, seminar_id)";
        DBManager::get()->fetchFirst(
            $query,
            [],
            function ($user_id) use ($parameters, $notification) {
                $user = User::find($user_id);
                if (!$user || $user->isBlocked()) {
                    return;
                }

                $GLOBALS['user'] = new Seminar_User($user);

                $ok = false;
                $mailmessage = $notification->getAllNotifications($user->id);

                if ($mailmessage) {
                    setTempLanguage('', $user->preferred_language);

                    $ok = StudipMail::sendMessage(
                        $user->email,
                        "[" . Config::get()->UNI_NAME_CLEAN . "] " . _('Tägliche Benachrichtigung'),
                        $mailmessage['text'],
                        $user->config->MAIL_AS_HTML ? $mailmessage['html'] : null
                    );
                }

                // Unset user configuration cache to preserve memory
                UserConfig::set($user->id, null);

                // Log results
                if ($ok !== false && $parameters['verbose']) {
                    echo $user->username . ':' . $ok . "\n";
                }
            }
        );

        $GLOBALS['user'] = $cli_user;
    }
}