public static function filterAddToCartButton($html) {
        global $usces, $post;

        $comboset = ComboSet::getComboSetFromSkuCode($post->ID, $usces->itemsku['code']);
        if ($comboset instanceof GenericError) {
            return $html;
        }

        if (empty($comboset->getGroups())) {
            return $html;
        }

        $empty = true;
        foreach ($comboset->getGroups() as $group) {
            if (!empty($group->getItems())) {
                $empty = false;
                break;
            }
        }

        if ($empty === true) {
            return $html;
        }

        $id = $comboset->getId();
        $html = preg_replace('/name="inCart/', 'data-combo-set-id="' . $id . '" name="wcexicsAddToCart', $html);
        return $html;
    }