/**
  * 
  * onAjax action handler
  */
 public static function onAjaxAction()
 {
     $actionType = UniteFunctionsUG::getPostGetVariable("action");
     if ($actionType != "unitegallery_ajax_action") {
         return false;
     }
     $gallery = new UniteGalleryGallery();
     $galleries = new UniteGalleryGalleries();
     $categories = new UniteGalleryCategories();
     $items = new UniteGalleryItems();
     $operations = new UGOperations();
     $action = UniteFunctionsUG::getPostGetVariable("client_action");
     $data = UniteFunctionsUG::getPostVariable("data");
     $data = UniteProviderFunctionsUG::normalizeAjaxInputData($data);
     $galleryType = UniteFunctionsUG::getPostVariable("gallery_type");
     $urlGalleriesView = HelperUG::getGalleriesView();
     try {
         switch ($action) {
             case "gallery_actions":
                 $galleryID = UniteFunctionsUG::getVal($data, "galleryID");
                 $galleryAction = UniteFunctionsUG::getVal($data, "gallery_action");
                 $galleryData = UniteFunctionsUG::getVal($data, "gallery_data", array());
                 self::onGalleryAjaxAction($galleryType, $galleryAction, $galleryData, $galleryID);
                 break;
             case "get_thumb_url":
                 $urlImage = UniteFunctionsUG::getVal($data, "urlImage");
                 $imageID = UniteFunctionsUG::getVal($data, "imageID");
                 $urlThumb = $operations->getThumbURLFromImageUrl($urlImage, $imageID);
                 $arrData = array("urlThumb" => $urlThumb);
                 HelperUG::ajaxResponseData($arrData);
                 break;
             case "add_category":
                 $catData = $categories->addFromData();
                 HelperUG::ajaxResponseData($catData);
                 break;
             case "remove_category":
                 $response = $categories->removeFromData($data);
                 HelperUG::ajaxResponseSuccess(__("The category deleted successfully.", UNITEGALLERY_TEXTDOMAIN), $response);
                 break;
             case "update_category":
                 $categories->updateFromData($data);
                 HelperUG::ajaxResponseSuccess(__("Category updated.", UNITEGALLERY_TEXTDOMAIN));
                 break;
             case "update_cat_order":
                 $categories->updateOrderFromData($data);
                 HelperUG::ajaxResponseSuccess(__("Order updated.", UNITEGALLERY_TEXTDOMAIN));
                 break;
             case "add_item":
                 $itemData = $items->addFromData($data);
                 HelperUG::ajaxResponseData($itemData);
                 break;
             case "get_item_data":
                 $response = $items->getItemData($data);
                 HelperUG::ajaxResponseData($response);
                 break;
             case "update_item_data":
                 $response = $items->updateItemData($data);
                 HelperUG::ajaxResponseSuccess(__("Item data updated!", UNITEGALLERY_TEXTDOMAIN), $response);
                 break;
             case "remove_items":
                 $response = $items->removeItemsFromData($data);
                 HelperUG::ajaxResponseSuccess(__("Items Removed", UNITEGALLERY_TEXTDOMAIN), $response);
                 break;
             case "get_cat_items":
                 $responeData = $items->getCatItemsHtmlFromData($data);
                 //update category param if inside gallery
                 $gallery->updateItemsCategoryFromData($data);
                 HelperUG::ajaxResponseData($responeData);
                 break;
             case "update_item_title":
                 $items->updateItemTitleFromData($data);
                 HelperUG::ajaxResponseSuccess(__("Item Title Updated", UNITEGALLERY_TEXTDOMAIN));
                 break;
             case "duplicate_items":
                 $response = $items->duplicateItemsFromData($data);
                 HelperUG::ajaxResponseSuccess(__("Items Duplicated", UNITEGALLERY_TEXTDOMAIN), $response);
                 break;
             case "update_items_order":
                 $items->saveOrderFromData($data);
                 HelperUG::ajaxResponseSuccess(__("Order Saved", UNITEGALLERY_TEXTDOMAIN));
                 break;
             case "copy_move_items":
                 $response = $items->copyMoveItemsFromData($data);
                 HelperUG::ajaxResponseSuccess(__("Done Operation", UNITEGALLERY_TEXTDOMAIN), $response);
                 break;
             case "create_gallery":
                 $galleryID = $galleries->addGaleryFromData($galleryType, $data);
                 $urlView = HelperUG::getGalleryView($galleryID);
                 HelperUG::ajaxResponseSuccessRedirect(__("Gallery Created", UNITEGALLERY_TEXTDOMAIN), $urlView);
                 break;
             case "delete_gallery":
                 $galleries->deleteGalleryFromData($data);
                 HelperUG::ajaxResponseSuccessRedirect(__("Gallery deleted", UNITEGALLERY_TEXTDOMAIN), $urlGalleriesView);
                 break;
             case "update_gallery":
                 $galleries->updateGalleryFromData($data);
                 HelperUG::ajaxResponseSuccess(__("Gallery Updated"));
                 break;
             case "duplicate_gallery":
                 $galleries->duplicateGalleryFromData($data);
                 HelperUG::ajaxResponseSuccessRedirect(__("Gallery duplicated", UNITEGALLERY_TEXTDOMAIN), $urlGalleriesView);
                 break;
             case "update_plugin":
                 if (method_exists("UniteProviderFunctionsUG", "updatePlugin")) {
                     UniteProviderFunctionsUG::updatePlugin();
                 } else {
                     echo "Functionality Don't Exists";
                 }
                 break;
             case "export_gallery_settings":
                 $galleryID = UniteFunctionsUG::getPostGetVariable("galleryid");
                 $galleries->exportGallerySettings($galleryID);
                 break;
             case "import_gallery_settings":
                 $galleryID = UniteFunctionsUG::getPostGetVariable("galleryid");
                 $galleries->importGallerySettingsFromUploadFile($galleryID);
                 break;
             default:
                 HelperUG::ajaxResponseError("wrong ajax action: <b>{$action}</b> ");
                 break;
         }
     } catch (Exception $e) {
         $message = $e->getMessage();
         $errorMessage = $message;
         if (GlobalsUG::SHOW_TRACE == true) {
             $trace = $e->getTraceAsString();
             $errorMessage = $message . "<pre>" . $trace . "</pre>";
         }
         HelperUG::ajaxResponseError($errorMessage);
     }
     //it's an ajax action, so exit
     HelperUG::ajaxResponseError("No response output on <b> {$action} </b> action. please check with the developer.");
     exit;
 }