Add image to product

    private function aggiungiImmagine($id_product = 0, $url = "", $isCover = false){

        // check the extension of image
        $currentExtension = end(explode('.', $url));
        $urlTemp = $url;
        echo $currentExtension ."; ";
        if ($currentExtension == "png"){
            $this->png2jpg($urlTemp, _PS_MODULE_DIR_.'cmtCatalogImporter/tempDir/img/'.nomeImgTemp, qualitaImg);
            $urlTemp = tempDirImgUrl .nomeImgTemp;
        }

        $shops = Shop::getShops(true, null, true);
        $image = new Image();
        $image->id_product = $id_product;
        $image->position = Image::getHighestPosition($id_product) + 1;
        $image->cover = $isCover; // true or false;
        if (($image->validateFields(false, true)) === true &&
            ($image->validateFieldsLang(false, true)) === true && $image->add())
        {
            $image->associateTo($shops);
            if (!AdminImportControllerCustom::caricaImmagine($id_product, $image->id, $urlTemp))
            {
                //echo $url;
                //$image->delete();
            }
        }
    }