class FileDownloads
{
    /**
     * Registers hooks
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return void
     */
    public static function init() {
        add_filter('usces_filter_is_purchased_item', [get_class(), 'filterIsPurchasedForGroupItems'], 10, 5);
        add_filter('usces_filter_cart_item_name', [get_class(), 'makeGroupDataItemsDownloadable'], 10, 2);
    }

    /**
     * Sets extra combo-set specific parameters to dlseller download link
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param string $empty
     * @param int    $post_id
     * @return string
     */
    public function filterGroupItemDownloadUrlParams($empty, $post_id) {
        return "&pid={$post_id}";
    }

    /**
     * Makes DLSeller use the combo-set order ID when checking if a group item is purchased
     *
     * This is required to make group 'data' items downloadable from the checkout completion page
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param bool   $res
     * @param int    $mid
     * @param int    $post_id
     * @param string $sku
     * @param int    $order_id
     * @return bool
     */
    public static function filterIsPurchasedForGroupItems($res, $mid, $post_id, $sku, $order_id) {
        global $wpdb;

        if (isset($_SESSION['comboSetIsPurchased'])) {
            return $_SESSION['comboSetIsPurchased'];
        }

        if (empty($order_id)) {
            return $res;
        }

        $order_table_name = usces_get_tablename('usces_order');
        $query = $wpdb->prepare("SELECT order_status FROM $order_table_name WHERE ID = %d", $order_id);
        $status = $wpdb->get_var($query);
        $cart = usces_get_ordercartdata($order_id);
        $post_id = (int)$post_id;
        $founditem = false;
        foreach ($cart as $cart_row) {
            $sels = unserialize($cart_row['cart_serial']);
            if (!empty($sels['comboSetId']) && isset($sels['comboSetItems'])) {
                $cscart = wcexics_api_get_combo_set_ordercartdata($order_id);
                foreach ($cscart as $cscart_row) {
                    $sku_code = urldecode($cscart_row['sku']);
                    if (!empty($sku)) {
                        if ((int)$cscart_row['post_id'] === $post_id && $sku_code === $sku) {
                            $founditem = true;
                            break 2;
                        }
                    } else {
                        if ((int)$cscart_row['post_id'] === $post_id) {
                            $founditem = true;
                            break 2;
                        }
                    }
                }
            }
        }

        if ($founditem) {
            if (false === strpos($status, 'noreceipt') && false === strpos($status, 'pending')) {
                $res = true;
            } elseif (false !== strpos($status, 'noreceipt') || false !== strpos($status, 'pending')) {
                $res = 'noreceipt';
            }
        }

        return $res;
    }

    /**
     * Adds download button for 'data' group items on checkout completion page
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param string $html
     * @param array  $args
     * @return string
     */
    public static function makeGroupDataItemsDownloadable($html, $args) {
        global $usces;

        if (!WelcartUtils::isOrderCompletionPage()) {
            return $html;
        }

        $sels = unserialize($args['cart_row']['serial']);
        // combo-set ID not set, continue
        if (empty($sels['comboSetId'])) {
            return $html;
        }
        // combo-set group items not set, continue
        if (!isset($sels['comboSetItems'])) {
            return $html;
        }

        $realcart = $_SESSION['usces_cart'];
        $_SESSION['usces_cart'] = $sels['comboSetItems'];
        $gitemscart = $usces->cart->get_cart();
        $_SESSION['usces_cart'] = $realcart;

        $datacart = [];
        foreach ($gitemscart as $i => $data) {
            $usces_item = $usces->get_item($data['post_id']);
            if ($usces_item['item_division'] === 'data') {
                $datacart[] = $data;
            }
        }

        if (!empty($datacart)) {
            $member = $usces->get_member();
            $_SESSION['comboSetIsPurchased'] = $usces->is_purchased_item($member['ID'], $args['cart_row']['post_id']);
            $fd = new FileDownloads();
            add_filter('dlseller_filter_download_para', [$fd, 'filterGroupItemDownloadUrlParams'], 10, 2);
            $html .= '<div class="avc-v3 flex column-nowrap mt-1rem">';
            $html .= dlseller_completion_info($datacart, 'return');
            $html .= '</div>';
            remove_filter('dlseller_filter_download_para', [$fd, 'filterGroupItemDownloadUrlParams'], 10);
            unset($_SESSION['comboSetIsPurchased']);
        }

        return $html;
    }
}