class CartPage
{
    const SCRIPT_HANDLE = 'wcexwl-cart';

    /**
     * Master object
     *
     * @var Master
     */
    protected $master;

    /**
     * Injects `Master` object
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param Master $master
     * @return void
     */
    public function __construct(Master $master) {
        $this->master = $master;
    }

    /**
     * Registers hooks
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return void
     */
    public function init() {
        add_filter('usces_filter_cart_upbutton', [$this, 'cartBatchDropdown'], 10, 1);
        add_filter('usces_theme_filter_upbutton', [$this, 'cartBatchDropdown'], 10, 1);
        add_filter('usces_filter_cart_row', [$this, 'filterCartRow'], 11, 3);
        add_action('usces_action_cart_page_header', [$this, 'startMobileBuffer'], 1);
        add_action('usces_action_cart_page_inform', [$this, 'endMobileBuffer'], 1);

        // for deprecated direct edit of theme file wc_cart_page.php
        add_filter('asumil_filter_cart_batch_dropdown', [$this, 'cartBatchDropdown'], 10, 1);
    }

    /**
     * Dropdown list of batch actions. Displayed on the cart page
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param string $html
     * @return string
     */
    public function cartBatchDropdown($html) {
        /**
         * Return `false` with this hook to prevent cart page CSS from being loaded
         *
         * @important
         * @param bool $flag Default: `true`
         */
        if (apply_filters('wcexwl_filter_cart_page_load_css', true)) {
            // load semantic-ui and common css
            Utils::loadCommonCss();
            Semantic::loadLoaderCss();

            // load css for page
            wp_enqueue_style(
                'wcexwl-cart-page',
                WCEXWL_PLUGIN_URL . '/src/Styles/cart.css',
                [],
                WCEXWL_VERSION
            );
        }

        // load JS client SDK
        $this->master->loadClientSdk();

        /**
         * Fires after all cart page common/default JS/CSS has been enqueued
         *
         * Use this hook to enqueue your own JS/CSS on the cart page if necessary.
         *
         * @important
         */
        do_action('wcexwl_cart_page_on_load_assets');

        return $this->loadImplementation($html);
    }

    /**
     * Dropdown list of batch actions. Displayed on the cart page
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param string $html
     * @return string
     */
    protected function loadImplementation($html) {
        wp_enqueue_script(
            self::SCRIPT_HANDLE,
            WCEXWL_PLUGIN_URL . '/src/Views/CartPage/cart.js',
            [],
            WCEXWL_VERSION,
            true
        );
        wp_localize_script(self::SCRIPT_HANDLE, 'wcexwl', $this->master->getScriptInjectionVariables());
        Snackbar::load([self::SCRIPT_HANDLE]);

        $html = self::getBatchActionsHtml();
        return $html;
    }

    /**
     * Returns batch actions section HTML
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return string
     */
    public static function getBatchActionsHtml() {
        $display = Master::getFilterableValues();
        ob_start();
        ?>
        <div class="wcexwl flex column-nowrap mb-1rem cart-page-batch-actions">
            <div class="upquant-inform"><?php _e('Press the `update` button when you change the amount of items.', 'usces'); ?></div>
            <div class="batch-select-container wcexwl flex row-nowrap">
                <div class="wcexwl flex row-nowrap">
                    <select id="wcexwl_batch_dropdown" class="wcexwl batch-select" value="none">
                        <option value="none"><?php echo $display['selectText']; ?></option>
                        <option value="addToWishlist"><?php echo $display['toWishlistSelectText']; ?></option>
                        <option value="batchDelete"><?php echo $display['deleteSelectText']; ?></option>
                    </select>
                    <input
                        id="wcexwl_batch_button"
                        class="wcexwl <?php echo $display['btnprimary']; ?> batch-button"
                        type="submit"
                        value="<?php echo $display['cartBatchButtonText']; ?>"
                        onclick="return wcexwl.cart.handleBatchAction(event);"
                    />
                </div>
                <div class="wcexwl flex p-0 m-0 ml-auto upbutton cart-quant-update-btn">
                    <input
                        type="submit"
                        name="upButton"
                        class="wcexwl m-0"
                        value="<?php _e('Quantity renewal', 'usces'); ?>"
                        onclick="return uscesCart.upCart();"
                    />
                </div>
            </div>
        </div>
        <?php
        $html = (string)ob_get_clean();
        /**
         * Filters cart page batch dropdown HTML section
         *
         * @important
         * @param string $html
         */
        $html = apply_filters('wcexwl_filter_cart_batch_dropdown_html', $html);

        return $html;
    }

    /**
     * `preg_replace`s cart number td in cart table with a checkbox for batch operations
     *
     * Since WCEX Mobile does not specify `class="num"` on the number td, we just assume
     * that the first td in the row is the one we want to replace.
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param string $row
     * @param array  $cart
     * @param array  $args
     * @return string
     */
    public function filterCartRow($row, $cart, $args) {
        $pattern = '/(<td\s+class="num">).*(<\/td>)/';
        if (self::isMobileTheme()) {
            $pattern = '/(<td.*>).*(<\/td>)/';
        }
        $replacement = preg_replace(
            $pattern,
            '${1}' . self::getCartRowCheckbox($args['cart_row']['serial']) . '${2}',
            $row,
            1
        );
        return $replacement === null ? $row : $replacement;
    }

    /**
     * Returns checkox HTML for cart row td
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param string $serial
     * @return string
     */
    public static function getCartRowCheckbox($serial) {
        ob_start();
        ?>
        <div class="wcexwl flex ai-center jc-center">
            <input class="wcexwl-batch-action-checkbox" value="<?php echo urlencode($serial); ?>" type="checkbox" />
        </div>
        <?php
        $checboxtd = (string)ob_get_clean();

        return $checboxtd;
    }

    /**
     * There is no filter for modifying the quantity update button for WCEX Mobile themes
     * so we are forced to `preg_replace` buffered output of the cart page
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return void
     */
    public function startMobileBuffer() {
        if (!self::isMobileTheme()) {
            return;
        }
        ob_start();
    }

    /**
     * `preg_replace` quantity update button with our batch action HTML
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return void
     */
    public function endMobileBuffer() {
        if (!self::isMobileTheme()) {
            return;
        }
        $html = (string)ob_get_clean();
        $dropdown = $this->cartBatchDropdown('');
        $replacement = preg_replace('/<div\s+class="upbutton">.*<\/div>/', $dropdown, $html, 1);
        echo $replacement === null ? $html : $replacement;
    }

    /**
     * Returns `true` if WCEX Mobile is enabled and a mobile theme is being used, `false` otherwise
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return bool
     */
    public static function isMobileTheme() {
        if (!defined('WCEX_MOBILE')) {
            return false;
        }

        global $wcmb;
        $d = $wcmb['device_div'];
        if (SMARTPHONE === $d || DOCOMO === $d || SOFTBANK === $d || KDDI === $d) {
            return true;
        }

        return false;
    }
}