public static function getComboSetCart($cart_row) {
        global $usces, $wpdb;

        $cserial = null;
        $isordercart = false;
        $grouplabelmap = [];
        $itemlabelmap = [];
        $ordercart = [];
        if (!empty($cart_row['serial'])) {
            $cserial = $cart_row['serial'];
        } elseif (!empty($cart_row['cart_serial'])) {
            $cserial = $cart_row['cart_serial'];
            $isordercart = true;
        }

        if ($cserial === null) {
            return null;
        }

        $sels = unserialize($cserial);
        if (empty($sels['comboSetId']) || !isset($sels['comboSetItems'])) {
            return null;
        }

        if ($isordercart === true) {
            $csgioct = Schema::getComboSetGroupItemsOrderCartTable();
            $results = $wpdb->get_results(
                $wpdb->prepare(
                    "SELECT * FROM {$csgioct} WHERE combo_set_cart_id = %d ORDER BY cart_id ASC",
                    $cart_row['cart_id']
                ),
                ARRAY_A
            );
            if ($results !== null) {
                $index = 0;
                foreach ($sels['comboSetItems'] as $gitem) {
                    if (empty($results[$index]['cart_serial'])) {
                        continue;
                    }
                    $gocserial = $results[$index]['cart_serial'];
                    $gisels = unserialize($gocserial);
                    $grouplabelmap[$gisels['groupId']] = !empty($gisels['groupLabel']) ? $gisels['groupLabel'] : '';
                    $itemlabelmap[$gisels['itemId']] = !empty($gisels['itemLabel']) ? $gisels['itemLabel'] : '';
                    $ordercart[$gisels['itemId']] = $results[$index];
                    $index++;
                }
            }
        } else {
            $cscart = !empty($_SESSION['usces_cart'][$cserial]) ? $_SESSION['usces_cart'][$cserial] : [];
            $grouplabelmap = !empty($cscart['grouplabelmap']) ? $cscart['grouplabelmap'] : [];
            $itemlabelmap = !empty($cscart['itemlabelmap']) ? $cscart['itemlabelmap'] : [];
            $ordercart = [];
        }

        $rows = [];
        foreach ($sels['comboSetItems'] as $serial => $gitem) {
            $gisels = unserialize($serial);
            $gicsels = (new \usces_cart())->key_unserialize($serial);
            $rows[$gisels['groupId']]['groupLabel'] = '';
            $glabel = '';
            if (!empty($grouplabelmap[$gisels['groupId']])) {
                $glabel = $grouplabelmap[$gisels['groupId']];
            }
            $itemLabel = '';
            if (!empty($itemlabelmap[$gisels['itemId']])) {
                $itemLabel = $itemlabelmap[$gisels['itemId']];
            } else {
                $itemLabel = wcexics_get_group_item_default_label(
                    $usces->getItemName($gicsels['post_id']),
                    $usces->getItemSkuDisp($gicsels['post_id'], urldecode($gicsels['sku'])),
                    $gitem['quant'],
                    $gitem['price']
                );
            }

            $opts = !empty($gicsels['options']) ? $gicsels['options'] : [];

            $giordercart = isset($ordercart[$gisels['itemId']]) ? $ordercart[$gisels['itemId']] : null;
            if (is_array($giordercart) && isset($giordercart['cart_id'])) {
                $options = wcexics_api_get_group_item_ordercart_meta('option', $giordercart['cart_id']);
                $options = is_array($options) ? $options : [];
                foreach ($options as $opt) {
                    $optv = maybe_unserialize($opt['meta_value']);
                    if (is_array($optv)) {
                        $optva = [];
                        foreach ($optv as $optvav) {
                            $optva[urlencode((string)$optvav)] = urlencode((string)$optvav);
                        }
                        $optv = $optva;
                    } else {
                        $optv = urlencode((string)$optv);
                    }
                    $opts[urlencode($opt['meta_key'])] = $optv;
                }
            }
            $rows[$gisels['groupId']]['groupLabel'] = $glabel;
            $rows[$gisels['groupId']]['groupItems'][] = [
                'name' => $itemLabel,
                'itemId' => $gisels['itemId'],
                'ordercart' => $giordercart,
                'options' => $opts,
            ];
        }

        return [
            'cserial' => $cserial,
            'grouplabelmap' => $grouplabelmap,
            'groupItems' => $sels['comboSetItems'],
            'cartRows' => $rows,
        ];
    }