abstract class Container
{

    /**
     * Slug name for our entry js script
     */
    const ENTRY_SCRIPT_SLUG = 'wcex-checkout-review';

    /**
     * Array of child components
     *
     * @var VueComponentLoader[]
     */
    public $childComponents;

    /**
     * AmazonPay module instance
     *
     * @var AmazonPay
     */
    protected $module;

    /**
     * Initializes member model var and registers hooks for quickpay page
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param AmazonPay $module
     */
    public function __construct(AmazonPay $module) {
        $this->module = $module;
    }

    /**
     * Instantiates child components
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return void
     */
    public function buildComponents() {
        $opts = $this->module->getActingOpts();
        $mmeta = !empty($_SESSION['usces_member']['ID']) ? new MemberMeta((int)$_SESSION['usces_member']['ID']) : -1;
        $buyerEmail = $_SESSION['amazonCheckoutSession']['buyer']['email'];
        $welcartEmail = !empty($_SESSION['usces_member']['mailaddress1']) ? $_SESSION['usces_member']['mailaddress1'] : '';
        $loadCouponForm = false;
        if (defined('WCEX_COUPON')) {
            $wccp = get_option('wccp');
            if ($wccp['front_display'] === '0' || ($wccp['front_display'] === '1' && usces_is_login())) {
                $loadCouponForm = true;
            }
        }
        $loadPointsForm = usces_is_member_system() && usces_is_member_system_point() && usces_is_login() && usces_is_available_point();
        $loadGiftForm = !usces_is_login();

        $amazonCheckoutDetailsComponent = $this->getAmazonCheckoutDetailsComponent();
        $purchaseButtonComponent = $this->getPurchaseButtonComponent();

        $this->childComponents = [
            'orderSummary' => new VueComponentLoader(
                new Components\OrderSummary\OrderSummary(),
                $this->filterLoadOrderSummary(true)
            ),
            'pointsForm' => new VueComponentLoader(
                new Components\PointsForm\PointsForm(),
                $this->filterLoadPointsForm($loadPointsForm)
            ),
            'couponForm' => new VueComponentLoader(
                new Components\CouponForm\CouponForm(),
                $this->filterLoadCouponForm($loadCouponForm)
            ),
            'deliveryForm' => new VueComponentLoader(
                new Components\DeliveryForm\DeliveryForm(),
                $this->filterLoadDeliveryForm(true)
            ),
            'notesForm' => new VueComponentLoader(
                new Components\Notes\Notes(),
                $this->filterLoadNotesForm($opts['quickpay_notes_field'] === 'on')
            ),
            'giftForm' => new VueComponentLoader(
                new Components\GiftForm\GiftForm(),
                $this->filterLoadGiftForm($loadGiftForm)
            ),
            'customCustomerFields' => new VueComponentLoader(
                new Components\CustomFields\CustomFields([
                    'ident' => 'customer',
                    'template' => 'welcart',
                    /**
                     * Filters whether or not error messages show directly above each カスタム・フィールド on
                     * the Quickpay checkout review page
                     *
                     * Used for all 4 custom field types:
                     * - カスタム・カスタマーフィールド
                     * - カスタム・デリバリーフィールド
                     * - カスタム・オーダーフィールド
                     * - カスタム・メンバーフィールド
                     *
                     * @param bool $flag Default: `false`
                     */
                    'display_errors' => apply_filters('wcexaap_checkout_review_filter_display_custom_fields_errors', false),
                ]),
                $this->filterLoadCustomCustomerFields(!usces_is_login())
            ),
            'customOrderFields' => new VueComponentLoader(
                new Components\CustomFields\CustomFields([
                    'ident' => 'order',
                    'template' => 'welcart',
                    /**
                     * Filters whether or not error messages show directly above each カスタム・フィールド on
                     * the Quickpay checkout review page
                     *
                     * Used for all 4 custom field types:
                     * - カスタム・カスタマーフィールド
                     * - カスタム・デリバリーフィールド
                     * - カスタム・オーダーフィールド
                     * - カスタム・メンバーフィールド
                     *
                     * @param bool $flag Default: `false`
                     */
                    'display_errors' => apply_filters('wcexaap_checkout_review_filter_display_custom_fields_errors', false),
                ]),
                $this->filterLoadCustomOrderFields($opts['quickpay_custom_order_fields'] === 'on')
            ),
            'customDeliveryFields' => new VueComponentLoader(
                new Components\CustomFields\CustomFields([
                    'ident' => 'delivery',
                    'template' => 'welcart',
                    /**
                     * Filters whether or not error messages show directly above each カスタム・フィールド on
                     * the Quickpay checkout review page
                     *
                     * Used for all 4 custom field types:
                     * - カスタム・カスタマーフィールド
                     * - カスタム・デリバリーフィールド
                     * - カスタム・オーダーフィールド
                     * - カスタム・メンバーフィールド
                     *
                     * @param bool $flag Default: `false`
                     */
                    'display_errors' => apply_filters('wcexaap_checkout_review_filter_display_custom_fields_errors', false),
                ]),
                $this->filterLoadCustomDeliveryFields($opts['quickpay_custom_delivery_fields'] === 'on')
            ),
            'amazonCheckoutDetails' => new VueComponentLoader($amazonCheckoutDetailsComponent, true),
            'purchaseButton' => new VueComponentLoader($purchaseButtonComponent, true),
            'registerWithAmazonForm' => new VueComponentLoader(
                new Components\RegisterWithAmazon\RegisterWithAmazon(),
                !usces_is_login()
            ),
            'linkMembersToAmazonForm' => new VueComponentLoader(
                new Components\LinkMembersToAmazon\LinkMembersToAmazon(),
                // Amazonアカウントと連携していない場合、チェックボックスを表示する。
                usces_is_login() && $mmeta->getAllowAmazonToWelcartLogin() === false && ($buyerEmail === $welcartEmail)
            ),
        ];
    }

    /**
     * Load page and assets then exit
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return void
     */
    public function loadPage() {
        $this->buildComponents();
        add_action('wcexaap_checkout_review_template', [$this, 'containerTemplate']);
        add_action('wp_enqueue_scripts', [$this, 'enqueueAssets']);

        usces_get_entries();
        usces_get_carts();
        usces_get_members();

        $this->beforeTemplateInclude();

        $parent_path = get_template_directory() . '/wc_templates';
        $child_path = get_stylesheet_directory() . '/wc_templates';
        $plugins_url_path = WP_PLUGIN_DIR . '/wcex-amazonpay/templates';
        $theme_template = wp_get_theme()->template;
        // TCD Welcartの場合、プラグイン内のファイルを取り込む
        if (file_exists($child_path . '/cart/wc_amazon_quickpay_page.php')) {
            include($child_path . '/cart/wc_amazon_quickpay_page.php');
        } elseif (file_exists($parent_path . '/cart/wc_amazon_quickpay_page.php') && !defined('USCES_PARENT_LOAD')) {
            include($parent_path . '/cart/wc_amazon_quickpay_page.php');
        } elseif ($theme_template === 'glamour_tcd073') {
            include($plugins_url_path . '/glamour_tcd073/cart/wc_amazon_quickpay_page.php');
        } elseif ($theme_template === 'ego_welcart_tcd079') {
            include($plugins_url_path . '/ego_welcart_tcd079/cart/wc_amazon_quickpay_page.php');
        } elseif ($theme_template === 'iconic_tcd062') {
            include($plugins_url_path . '/iconic_tcd062/cart/wc_amazon_quickpay_page.php');
        } else {
            echo $this->getPageTemplate();
        }

        $this->afterTemplateInclude();
        exit;
    }

    /**
     * Enqueues necessary assets
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @global \usc_e_shop $usces
     * @return void
     */
    public function enqueueAssets() {
        Theme::enqueueThemeCss(WCEXAAP_PLUGIN_URL);
        wp_enqueue_style(
            self::ENTRY_SCRIPT_SLUG,
            WCEXAAP_PLUGIN_URL . '/src/Components/CheckoutReview/style.css',
            [],
            WCEXAAP_VERSION
        );

        // scripts
        wp_enqueue_script(
            self::ENTRY_SCRIPT_SLUG,
            WCEXAAP_PLUGIN_URL . '/dist/checkoutReview.js',
            [],
            WCEXAAP_VERSION,
            true
        );
        $this->loadCustomAssets();
        /**
         * Fires after enqueuing CSS and JS for the Quickpay page
         *
         * Use this hook to load custom CSS or JS on the Quickpay page
         *
         * @important
         */
        do_action('wcexaap_quickpay_custom_assets');

        wp_set_script_translations(self::ENTRY_SCRIPT_SLUG, 'wcexaap', WCEXAAP_LANGDIR);
        wp_localize_script(self::ENTRY_SCRIPT_SLUG, AmazonPay::L10N, $this->makeJSvars());
    }

    /**
     * Javascript variables to be sent into script(s)
     *
     * @return array
     */
    public function makeJSvars() {
        $entries = new API\WelcartEntries();
        $jsvars = [];
        $jsvars['order'] = $entries->getOrder();
        $jsvars['childComponents'] = $this->childComponents;
        $jsvars = $this->filterJSVars($jsvars);
        $jsvars = array_merge($jsvars, $this->module->getScriptInjectionVariables());

        return $jsvars;
    }

    /**
     * Loads components inside `#cart` div
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return void
     */
    protected function loadCartComponents() {
        $order = [
            'orderSummary',
            'pointsForm',
            'couponForm',
            'deliveryForm',
            'customDeliveryFields',
            'customCustomerFields',
            'customOrderFields',
            'notesForm',
            'giftForm',
        ];
        $order = $this->filterCartComponentsOrder($order);
        foreach ($order as $compname) {
            $this->childComponents[$compname]->templateIfLoad();
        }
    }

    /**
     * Loads components above `#info-confirm` div
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return void
     */
    protected function loadConfirmComponents() {
        $order = [
            'amazonCheckoutDetails',
            'purchaseButton',
            'registerWithAmazonForm',
            'linkMembersToAmazonForm',
        ];
        $order = $this->filterConfirmComponentsOrder($order);
        foreach ($order as $compname) {
            $this->childComponents[$compname]->templateIfLoad();
        }
    }

    /**
     * Template HTML
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return string
     */
    public function getPageTemplate() {
        /**
         * Filters whether or not to call `get_header()` and `get_footer()` on the Quickpay page
         *
         * *This filter will not run for themes using their own `wc_amazon_quickpay_page.php`
         * template file*
         *
         * @param bool $flag Default: `true`
         */
        $withHeaderFooter = apply_filters('wcexaap_filter_checkout_review_template_header_footer_flag', true);
        ob_start();
        if ($withHeaderFooter === true) {
            get_header();
        }
        ?>
        <div id="primary" class="site-content">
            <div id="content" class="cart-page" role="main">
                <?php if (have_posts()) :
                    usces_remove_filter(); ?>

                    <article class="post" id="wc_confirm">
                        
                        <?php
                        /**
                         * Used to load all Vue components on the Quickpay page
                         */
                        do_action('wcexaap_checkout_review_template');
                        ?>

                    </article>

                <?php else : ?>
                    <p><?php _e('Sorry, no posts matched your criteria.'); ?></p>
                <?php endif; ?>
            </div>
        </div>
        <?php
        if ($withHeaderFooter === true) {
            get_footer();
        }
        $template = ob_get_clean();

        /**
         * Filters all Quickpay page HTML
         *
         * *This filter will not run for themes using their own `wc_amazon_quickpay_page.php`
         * template file*
         *
         * @param string                                                                         $template
         * @param \Aivec\Welcart\SettlementModules\AmazonPay\Components\CheckoutReview\Container $instance
         */
        return apply_filters('wcexaap_filter_checkout_review_template', $template, $this);
    }

    /**
     * Prints container wrapper with components for checkout review page
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return void
     */
    public function containerTemplate() {
        /**
         * Filters the HTML id name for the div that wraps the `checkout_review` Vue app
         *
         * @param string $wrapperid Default: `quickpay_wrapper`
         */
        $wrapperid = apply_filters('wcexaap_filter_quickpay_wrapper_div_id', 'quickpay_wrapper');
        ?>
        <div id="<?php echo esc_attr($wrapperid); ?>">
            <div id="checkout_review" class="wcexaap">
                <div id="info-confirm">
                    <h1 class="cart_page_title"><?php _e('Confirmation', 'usces'); ?></h1>

                    <div class="confiem_notice">
                        <?php _e('Please do not change product addition and amount of it with the other window with displaying this page.', 'usces'); ?>
                    </div>

                    <div class="header_explanation">
                        <?php
                        /**
                         * Mirrored Welcart action hook
                         *
                         * @ignore
                         */
                        do_action('usces_action_confirm_page_header');
                        ?>
                        <?php echo $this->filterTemplateTopErrorMessage(''); ?>
                    </div>

                    <?php
                    /**
                     * Mirrored Welcart action hook
                     *
                     * @ignore
                     */
                    do_action('usces_action_delivery_page_inform');
                    ?>
                    <div id="cart">
                        <?php $this->loadCartComponents(); ?>
                    </div>
                    <?php $this->loadConfirmComponents(); ?>
                    <div class="footer_explanation">
                        <?php echo $this->filterTemplateBottomErrorMessage(''); ?>
                        <?php
                        /**
                         * Mirrored Welcart action hook
                         *
                         * @ignore
                         */
                        do_action('usces_action_confirm_page_footer');
                        ?>
                    </div>
                </div>
            </div>
        </div>
        <?php
    }

    /**
     * Should return an instance of `AmazonCheckoutDetails`
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return Components\AmazonCheckoutDetails\AmazonCheckoutDetails
     */
    abstract protected function getAmazonCheckoutDetailsComponent();

    /**
     * Should return an instance of `VueComponent`
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return VueComponent
     */
    abstract protected function getPurchaseButtonComponent();

    /**
     * Executes before template file has been included
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return void
     */
    protected function beforeTemplateInclude() {
    }

    /**
     * Executes after template file has been included
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return void
     */
    protected function afterTemplateInclude() {
    }

    /**
     * Filters whether to load `deliveryForm` component or not
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param bool $load
     * @return bool
     */
    protected function filterLoadDeliveryForm($load) {
        return $load;
    }

    /**
     * Filters whether to load `notesForm` component or not
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param bool $load
     * @return bool
     */
    protected function filterLoadNotesForm($load) {
        return $load;
    }

    /**
     * Filters whether to load `giftForm` component or not
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param bool $load
     * @return bool
     */
    protected function filterLoadGiftForm($load) {
        return $load;
    }

    /**
     * Filters whether to load `pointsForm` component or not
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param bool $load
     * @return bool
     */
    protected function filterLoadPointsForm($load) {
        return $load;
    }

    /**
     * Filters whether to load `couponForm` component or not
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param bool $load
     * @return bool
     */
    protected function filterLoadCouponForm($load) {
        return $load;
    }

    /**
     * Filters whether to load `orderSummary` component or not
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param bool $load
     * @return bool
     */
    protected function filterLoadOrderSummary($load) {
        return $load;
    }

    /**
     * Filters whether to load `customCustomerFields` component or not
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param bool $load
     * @return bool
     */
    protected function filterLoadCustomCustomerFields($load) {
        return $load;
    }

    /**
     * Filters whether to load `customOrderFields` component or not
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param bool $load
     * @return bool
     */
    protected function filterLoadCustomOrderFields($load) {
        return $load;
    }

    /**
     * Filters whether to load `customDeliveryFields` component or not
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param bool $load
     * @return bool
     */
    protected function filterLoadCustomDeliveryFields($load) {
        return $load;
    }

    /**
     * Filters script injection variables
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param array $jsvars
     * @return array
     */
    protected function filterJSVars(array $jsvars) {
        return $jsvars;
    }

    /**
     * Filters order of top components
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param array $order
     * @return array
     */
    protected function filterConfirmComponentsOrder(array $order) {
        return $order;
    }

    /**
     * Filters order of cart components
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param array $order
     * @return array
     */
    protected function filterCartComponentsOrder(array $order) {
        return $order;
    }

    /**
     * Filters error message displayed at the top of the page
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param string $emessage
     * @return string
     */
    public function filterTemplateTopErrorMessage($emessage) {
        return $emessage;
    }

    /**
     * Filters error message displayed at the bottom of the page
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param string $emessage
     * @return string
     */
    public function filterTemplateBottomErrorMessage($emessage) {
        return $emessage;
    }

    /**
     * Invoked after scripts and styles are enqueued
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return void
     */
    protected function loadCustomAssets() {
    }
}