/**
  * @param Mage_Catalog_Model_Resource_Product_Collection $productCollection
  * @return mixed
  */
 public function sort(Mage_Catalog_Model_Resource_Product_Collection $productCollection)
 {
     //Pass a small validation
     if (!$this->_getHelper()->isCategorySortingEnable() || $productCollection->getFlag(self::MARKETO_SORTED)) {
         return $productCollection;
     }
     $categoriesList = $this->_getPesonalizeCalculator()->getScoreCategoryParams(HooshMarketing_Marketo_Model_Personalize_Calculator::CATEGORY_ID_AND_SCORE);
     //get List of categories with key -> Category_id and value - Score
     if (!count($categoriesList)) {
         //if we havn`t score categories do nothing
         return $productCollection;
     }
     uasort($categoriesList, function ($f, $s) {
         return $f > $s ? 1 : -1;
         //sort by descending
     });
     //Sort categories in order to show top scored categories first
     $categoriesList = array_keys($categoriesList);
     // get only category ids
     try {
         $productCategoryTable = $this->_getCoreResource()->getTableName("catalog_category_product");
         $productCollection->getSelect()->joinLeft(array("marketo_category_table" => $productCategoryTable), "marketo_category_table.product_id = e.entity_id", array("top_category_id" => "marketo_category_table.category_id"))->group("entity_id")->order("FIELD(top_category_id, " . implode(',', $categoriesList) . ") DESC");
         //order by top
         $productCollection->setFlag(self::MARKETO_SORTED, true);
         //to set order only one time
     } catch (Exception $e) {
         Mage::logException($e);
     }
     return $productCollection;
 }