class CartPages
{
    /**
     * Registers hooks
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return void
     */
    public static function init() {
        $loader = function () {
            $loadcore = apply_filters('wcexics_filter_load_cart_table_default_css', true);
            if ($loadcore === true) {
                Cart::loadCss();
            }
            do_action('wcexics_load_cart_table_assets');
        };
        (new ConditionalAssetsLoader())->loadCartPageAssets($loader);
        (new ConditionalAssetsLoader())->loadConfirmPageAssets($loader);
        (new ConditionalAssetsLoader())->loadMemberPageAssets($loader);
        (new ConditionalAssetsLoader())->loadOrderCompletionPageAssets(function () use ($loader) {
            $loader();
            Loader::loadCoreCss();
        });

        add_filter('usces_filter_cart_item_name_nl', [get_class(), 'displayGroupItemsInCartItemNameEmail'], 10, 2);
        add_filter('usces_filter_cart_item_name', [get_class(), 'displayGroupItemsInCartItemName'], 10, 2);
        add_filter('usces_filter_cart_row', [get_class(), 'addComboSetItemsInput'], 20, 3);
    }

    /**
     * Adds group items underneath the cart item name in emails and PDF files
     *
     * Unfortunately, this same filter is used when displaying the cart item name in PDF files so
     * we need to make sure to not use HTML in that case. The only way to do that is by checking
     * whether an `index` key exists in the `$args` parameter. It's an ugly solution but it's the
     * only one available.
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param string $cartItemName
     * @param array  $args
     * @return string
     */
    public static function displayGroupItemsInCartItemNameEmail($cartItemName, $args) {
        if (usces_is_html_mail() && !isset($args['index'])) {
            return self::displayGroupItemsInCartItemName($cartItemName, $args);
        }

        $data = self::getComboSetCart($args['cart_row']);
        if (empty($data)) {
            return $cartItemName;
        }

        return $cartItemName . Cart::getComboSetCartDetailsNoHtml($data['cartRows'], !isset($args['index']));
    }

    /**
     * Adds group items HTML underneath the cart item name
     *
     * Applies to the member page, cart page, confirm page, and order completion page
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param string $cartItemName
     * @param array  $args
     * @return string
     */
    public static function displayGroupItemsInCartItemName($cartItemName, $args) {
        if (empty($args['cart_row'])) {
            return $cartItemName;
        }

        $data = self::getComboSetCart($args['cart_row']);
        if (empty($data)) {
            return $cartItemName;
        }

        return $cartItemName . Cart::getComboSetCartDetailsHtml($data['cartRows']);
    }

    /**
     * Returns cart data for a combo-set cart row
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @global \usc_e_shop $usces
     * @global \wpdb $wpdb
     * @param array $cart_row
     * @return null|array
     */
    public static function getComboSetCart($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,
        ];
    }

    /**
     * Adds combo-set ID and group items inputs for use in `up_serialize`
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param string $row
     * @param array  $cart
     * @param array  $materials
     * @return string
     */
    public static function addComboSetItemsInput($row, $cart, $materials) {
        $sels = unserialize($materials['cart_row']['serial']);
        if (empty($sels['comboSetId']) || empty($sels['comboSetItems'])) {
            return $row;
        }

        $i = $materials['i'];
        $comboSetId = $sels['comboSetId'];
        $comboSetItems = serialize($sels['comboSetItems']);
        $row .= "<input type='hidden' name='comboSetId[{$i}]' value='{$comboSetId}' />";
        $row .= "<input type='hidden' name='comboSetItems[{$i}]' value='{$comboSetItems}' />";
        return $row;
    }
}