public static function getViewerType($kshow, $kuserId)
 {
     $viewerType = KshowKuser::KSHOWKUSER_VIEWER_USER;
     // viewer
     if ($kuserId) {
         if ($kshow->getProducerId() == $kuserId) {
             $viewerType = KshowKuser::KSHOWKUSER_VIEWER_PRODUCER;
             // producer
         } else {
             if (myKshowUtils::isSubscribed($kshow->getId(), $kuserId)) {
                 $viewerType = KshowKuser::KSHOWKUSER_VIEWER_SUBSCRIBER;
             }
             // subscriber;
         }
     }
     return $viewerType;
 }