class ItemPage
{
    const SCRIPT_HANDLE = 'wcexwl-item';

    /**
     * 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() {
        (new ConditionalAssetsLoader())->loadItemPageAssets([$this, 'loadEssentialAssets']);
        add_action('wcex_sku_select_change_sku_success_js', [$this, 'updateCurrentSku'], 10, 1);
        add_filter('usces_filter_item_sku_button', [$this, 'addWishlistButton'], 10, 3);
    }

    /**
     * Loads CSS/JS for item page
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return void
     */
    public function loadEssentialAssets() {
        /**
         * Return `false` with this hook to prevent item page CSS from being loaded
         *
         * @important
         * @param bool $flag Default: `true`
         */
        if (apply_filters('wcexwl_filter_item_page_load_css', true)) {
            // load semantic-ui and common css
            Utils::loadCommonCss();
            Semantic::loadButtonCss();
            Semantic::loadLoaderCss();

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

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

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

        $this->loadImplementationAssets();
    }

    /**
     * Loads our JS
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return void
     */
    protected function loadImplementationAssets() {
        wp_enqueue_script(
            self::SCRIPT_HANDLE,
            WCEXWL_PLUGIN_URL . '/src/Views/ItemPage/item.js',
            [],
            WCEXWL_VERSION,
            true
        );
        $assetsmap = include(WCEXWL_PLUGIN_DIR . '/dist/js/utils.asset.php');
        wp_enqueue_script(
            'wcexwl-utils',
            WCEXWL_PLUGIN_URL . '/dist/js/utils.js',
            array_merge($assetsmap['dependencies'], [self::SCRIPT_HANDLE]),
            $assetsmap['version'],
            true
        );
        wp_localize_script(self::SCRIPT_HANDLE, 'wcexwl', $this->master->getScriptInjectionVariables());
        Snackbar::load([self::SCRIPT_HANDLE]);
    }

    /**
     * Updates the value of the currently selected SKU when using `wcex_sku_select`
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param int $post_id
     * @return void
     */
    public function updateCurrentSku($post_id) {
        ?>
        $('.wishlist-button').attr('onclick', "return wcexwl.item.addToWishlist(event, this, '<?php echo $post_id; ?>', '" + data['sku_enc'] + "')");
        <?php
    }

    /**
     * Adds wishlist button next to "Add to Cart" button on item pages
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param string $skubutton
     * @return string
     */
    public function addWishlistButton($skubutton) {
        global $usces;

        $display = Master::getFilterableValues();
        $currentsku = urlencode($usces->itemsku['code']);
        $post_id = (int)get_the_ID();
        ob_start();
        ?>
        <div class="wcexwl item-page-buttons flex row-wrap ai-stretch jc-flex-end ml-05rem-children-not-first mt-05rem-children">
            <?php echo $skubutton; ?>
            <div class="wcexwl flex row-wrap ai-stretch">
                <input
                    type="submit"
                    value="<?php echo $display['addToWishlistButtonText'] ?>"
                    class="wishlist-button <?php echo $display['btnsecondary']; ?>"
                    onclick="return wcexwl.item.addToWishlist(event, this, <?php echo $post_id; ?>, '<?php echo $currentsku; ?>')"
                />
            </div>
        </div>
        <?php
        $buttons = (string)ob_get_clean();
        /**
         * Filters item page SKU and wishlist button HTML
         *
         * @important
         * @param string $buttons
         * @param string $skubutton Welcart 'Add to Cart' SKU button
         * @param int    $post_id
         * @param string $currentsku
         */
        $buttons = apply_filters('wcexwl_filter_item_page_buttons_html', $buttons, $skubutton, $post_id, $currentsku);

        return $buttons;
    }
}