/**
  * Get the html body for notification
  *
  * @param Tracker_DateReminder $reminder Reminder that will send notifications
  * @param Tracker_Artifact $artifact
  * @param String  $recipient    The recipient who will receive the notification
  * @param BaseLanguage $language The language of the message
  *
  * @return String
  */
 protected function getBodyHtml(Tracker_DateReminder $reminder, Tracker_Artifact $artifact, $recipient, BaseLanguage $language)
 {
     $format = Codendi_Mail_Interface::FORMAT_HTML;
     $hp = Codendi_HTMLPurifier::instance();
     $protocol = $GLOBALS['sys_force_ssl'] ? 'https' : 'http';
     $link = $protocol . '://' . $GLOBALS['sys_default_domain'] . TRACKER_BASE_URL . '/?aid=' . $artifact->getId();
     $output = '<h1>' . $hp->purify($artifact->fetchMailTitle($recipient, $format, false)) . '</h1>' . PHP_EOL;
     $output .= $language->getText('plugin_tracker_date_reminder', 'body_header', array($hp->purify($GLOBALS['sys_name']), $hp->purify($reminder->getField()->getLabel()), $reminder->getFieldValue($artifact)));
     $output .= '<br>';
     $output .= $language->getText('plugin_tracker_date_reminder', 'body_art_html_link', array($link));
     $output .= '<br>';
     return $output;
 }