wc-bootstrap/functions.php

<?php
/**
 * WooCommerce Bootstrap functions and definitions.
 *
 * Child theme of WP Bootstrap that overrides WooCommerce plugin templates
 * with Bootstrap 5 structures and styling.
 *
 * @package WcBootstrap
 * @since 0.1.0
 */

// Prevent direct access.
if ( ! defined( 'ABSPATH' ) ) {
    exit;
}


/**
 * Define theme constants.
 *
 * CRITICAL: WordPress reads the version from TWO places:
 * 1. style.css header "Version:" — WordPress uses THIS for admin display
 * 2. This PHP constant — used internally by the theme
 * Both MUST be updated on every release.
 */
define( 'WC_BOOTSTRAP_VERSION', '0.1.0' );
define( 'WC_BOOTSTRAP_PATH', get_stylesheet_directory() . '/' );
define( 'WC_BOOTSTRAP_URL', get_stylesheet_directory_uri() . '/' );

/**
 * Load Composer autoloader if present.
 */
if ( file_exists( WC_BOOTSTRAP_PATH . 'vendor/autoload.php' ) ) {
    require_once WC_BOOTSTRAP_PATH . 'vendor/autoload.php';
}

/**
 * Sets up theme defaults and registers support for various WordPress features.
 */
function wc_bootstrap_setup(): void {
    // Make theme available for translation.
    load_child_theme_textdomain( 'wc-bootstrap', WC_BOOTSTRAP_PATH . 'languages' );
}
add_action( 'after_setup_theme', 'wc_bootstrap_setup' );

/**
 * Initialize the WooCommerce-to-Twig template bridge.
 *
 * Registers the WooCommerce Twig extension with the parent theme's TwigService
 * and sets up template interception hooks so the child theme's Twig templates
 * are rendered instead of WooCommerce's PHP templates.
 *
 * Runs at 'init' priority 20 to ensure WooCommerce is fully loaded (it
 * initializes at 'init' priority 0).
 */
function wc_bootstrap_init_twig_bridge(): void {
    // Guard: require parent TwigService and WooCommerce.
    if ( ! class_exists( '\WPBootstrap\Twig\TwigService' ) || ! function_exists( 'WC' ) ) {
        return;
    }

    $twig = \WPBootstrap\Twig\TwigService::getInstance();
    $env  = $twig->getEnvironment();

    // Add child theme templates directory to the Twig loader so {% include %}
    // directives in Twig templates can find other child theme templates.
    $loader = $env->getLoader();
    if ( $loader instanceof \Twig\Loader\FilesystemLoader ) {
        $template_dir = WC_BOOTSTRAP_PATH . 'templates';
        if ( is_dir( $template_dir ) ) {
            $loader->prependPath( $template_dir );
        }
    }

    // Register WooCommerce functions and filters as Twig extensions.
    $env->addExtension( new \WcBootstrap\Twig\WooCommerceExtension() );

    // Register template interception hooks.
    $override = new \WcBootstrap\TemplateOverride();
    $override->register();
}
add_action( 'init', 'wc_bootstrap_init_twig_bridge', 20 );

/**
 * Enqueue child theme styles.
 *
 * Loads parent theme stylesheet first, then child theme overrides.
 * CSS cascade order:
 *   1. wp-bootstrap (parent)
 *   2. woocommerce (plugin styles)
 *   3. wc-bootstrap-style (child theme style.css)
 *   4. wc-bootstrap-overrides (plugin CSS overrides)
 */
function wc_bootstrap_enqueue_styles(): void {
    $theme_version = wp_get_theme()->get( 'Version' );

    // Enqueue parent theme stylesheet.
    wp_enqueue_style(
        'wp-bootstrap-style',
        get_template_directory_uri() . '/assets/css/style.min.css',
        array(),
        wp_get_theme( 'wp-bootstrap' )->get( 'Version' )
    );

    // Enqueue child theme stylesheet.
    wp_enqueue_style(
        'wc-bootstrap-style',
        get_stylesheet_directory_uri() . '/style.css',
        array( 'wp-bootstrap-style' ),
        $theme_version
    );

    // Enqueue plugin Bootstrap override styles.
    // Depend on plugin stylesheets so overrides always load after plugin CSS.
    wp_enqueue_style(
        'wc-bootstrap-overrides',
        get_stylesheet_directory_uri() . '/assets/css/wc-bootstrap.css',
        array( 'wc-bootstrap-style', 'woocommerce-general' ),
        $theme_version
    );
}
add_action( 'wp_enqueue_scripts', 'wc_bootstrap_enqueue_styles' );

/**
 * Enqueue child theme scripts.
 *
 * @since 0.1.0
 */
function wc_bootstrap_enqueue_scripts(): void {
    $theme_version = wp_get_theme()->get( 'Version' );

    // Quantity +/- button handler for Bootstrap input-group widget.
    wp_enqueue_script(
        'wc-bootstrap-quantity',
        get_stylesheet_directory_uri() . '/assets/js/quantity.js',
        array(),
        $theme_version,
        true
    );
}
add_action( 'wp_enqueue_scripts', 'wc_bootstrap_enqueue_scripts' );

/**
 * Handle plugin page rendering via plugin render filter.
 *
 * Delegates page rendering to the parent theme's TwigService so that plugin pages
 * share the same page shell (header, footer, layout) as native WordPress pages.
 * Falls back to letting the plugin handle rendering if the parent theme is not available.
 *
 * @param bool   $rendered Whether the page has been rendered.
 * @param string $content  Pre-rendered plugin HTML content.
 * @param array  $context  Plugin template context.
 * @return bool True if rendering was handled, false to let plugin use fallback.
 *
 * @since 0.1.0
 */
function wc_bootstrap_render_page( bool $rendered, string $content, array $context ): bool {
    if ( ! class_exists( '\WPBootstrap\Twig\TwigService' )
        || ! class_exists( '\WPBootstrap\Template\ContextBuilder' ) ) {
        return false; // Can't render, let plugin use its own fallback
    }

    $context_builder = new \WPBootstrap\Template\ContextBuilder();
    $theme_context   = $context_builder->build();
    $twig            = \WPBootstrap\Twig\TwigService::getInstance();

    // Inject plugin content as the page post content so page.html.twig renders it
    // inside the standard content block. Title is empty so the parent theme does not
    // render its own <h1> — plugin templates handle their own headings.
    $theme_context['post'] = array_merge(
        $theme_context['post'] ?? [],
        [
            'content'   => $content,
            'title'     => '',
            'thumbnail' => '',
        ]
    );

    echo $twig->render( 'pages/page.html.twig', $theme_context );
    return true;
}
add_filter( 'woocommerce_render_page', 'wc_bootstrap_render_page', 10, 3 );

/**
 * Signal to the plugin that its content will be wrapped by the parent theme.
 *
 * When the parent theme's TwigService is available, the plugin templates should skip
 * their outer wrapper elements (breadcrumbs, sidebar, page shell) to avoid double-wrapping.
 *
 * @param bool $wrapped Whether content is theme-wrapped.
 * @return bool
 *
 * @since 0.1.0
 */
function wc_bootstrap_is_wrapped( bool $wrapped ): bool {
    if ( class_exists( '\WPBootstrap\Twig\TwigService' ) ) {
        return true;
    }
    return $wrapped;
}
add_filter( 'woocommerce_is_theme_wrapped', 'wc_bootstrap_is_wrapped' );

/**
 * Add sticky header scroll shadow behavior.
 *
 * Toggles an 'is-stuck' class on the navbar when the page is scrolled,
 * adding a subtle box-shadow to visually separate the header from content.
 *
 * @since 0.1.0
 */
function wc_bootstrap_sticky_header_script(): void {
    ?>
    <script>
    (function() {
        var header = document.querySelector('header.sticky-top');
        if (!header) return;
        var onScroll = function() {
            header.classList.toggle('is-stuck', window.scrollY > 0);
        };
        window.addEventListener('scroll', onScroll, { passive: true });
        onScroll();
    })();
    </script>
    <?php
}
add_action( 'wp_footer', 'wc_bootstrap_sticky_header_script' );

/**
 * Register the shop sidebar widget area.
 *
 * Provides a widget area for product filters and shop-specific widgets.
 * Uses Bootstrap-styled markup matching the parent theme's sidebar pattern.
 *
 * @since 0.1.0
 */
function wc_bootstrap_register_sidebars(): void {
    register_sidebar( array(
        'name'          => __( 'Shop Sidebar', 'wc-bootstrap' ),
        'id'            => 'shop-sidebar',
        'description'   => __( 'Add widgets here to appear in the shop sidebar.', 'wc-bootstrap' ),
        'before_widget' => '<div id="%1$s" class="widget mb-4 %2$s">',
        'after_widget'  => '</div>',
        'before_title'  => '<h3 class="sidebar-heading h6 text-uppercase fw-semibold">',
        'after_title'   => '</h3>',
    ) );
}
add_action( 'widgets_init', 'wc_bootstrap_register_sidebars' );

/**
 * Set the number of product columns in the shop loop.
 *
 * @return int Number of columns.
 * @since 0.1.0
 */
function wc_bootstrap_loop_columns(): int {
    return 4;
}
add_filter( 'loop_shop_columns', 'wc_bootstrap_loop_columns' );

/**
 * Remove WooCommerce's default sidebar hook.
 *
 * The child theme's archive-product.php renders the sidebar inline within the
 * Bootstrap grid layout, so the default woocommerce_sidebar hook must not render
 * a second sidebar outside the layout.
 *
 * @since 0.1.0
 */
function wc_bootstrap_remove_default_sidebar(): void {
    remove_action( 'woocommerce_sidebar', 'woocommerce_get_sidebar', 10 );
}
add_action( 'init', 'wc_bootstrap_remove_default_sidebar' );

/**
 * Replace WooCommerce's content wrapper with a no-op.
 *
 * The parent theme's page shell already wraps content in a .container,
 * so WooCommerce's default wrapper (another .container + #primary + <main>)
 * creates a double-nested container that constrains width. Remove it and
 * let the parent theme handle the outer layout.
 *
 * @since 0.1.0
 */
function wc_bootstrap_remove_content_wrappers(): void {
    remove_action( 'woocommerce_before_main_content', 'woocommerce_output_content_wrapper', 10 );
    remove_action( 'woocommerce_after_main_content', 'woocommerce_output_content_wrapper_end', 10 );
}
add_action( 'init', 'wc_bootstrap_remove_content_wrappers' );

/**
 * Prevent the parent theme from rendering WooCommerce pages.
 *
 * The parent theme's TemplateController hooks template_redirect at priority 10
 * and renders its own templates for all requests (then exits). For WooCommerce
 * pages we need to render our own Bootstrap layouts instead.
 * Returning false tells the parent theme to skip rendering for this request.
 *
 * @param bool $should_render Whether the parent theme should render.
 * @return bool
 *
 * @since 0.1.0
 */
function wc_bootstrap_skip_parent_template( bool $should_render ): bool {
    if ( is_post_type_archive( 'product' ) || is_page( wc_get_page_id( 'shop' ) ) ) {
        return false;
    }
    if ( function_exists( 'is_product_taxonomy' ) && is_product_taxonomy() ) {
        return false;
    }
    if ( function_exists( 'is_product' ) && is_product() ) {
        return false;
    }
    return $should_render;
}
add_filter( 'wp_bootstrap_should_render_template', 'wc_bootstrap_skip_parent_template' );

/**
 * Disable WooCommerce's block template compatibility layer.
 *
 * The parent theme has theme.json which makes wp_is_block_theme() return true.
 * WooCommerce detects this and removes classic template hooks (title, price,
 * add-to-cart, etc.) from single product and archive pages, expecting blocks
 * to handle rendering instead. Since we render via classic hooks + Twig, we
 * need the hooks to stay registered.
 *
 * @param bool $disabled Whether the compatibility layer is disabled.
 * @return bool
 *
 * @since 0.1.0
 */
function wc_bootstrap_disable_block_compatibility( bool $disabled ): bool {
    return true;
}
add_filter( 'woocommerce_disable_compatibility_layer', 'wc_bootstrap_disable_block_compatibility' );

/**
 * Render product archive pages with Bootstrap 5 layout.
 *
 * Since the parent theme's TemplateController is blocked for product archives
 * (via wp_bootstrap_should_render_template filter), we render the page ourselves
 * at priority 11 using the parent theme's TwigService and page shell.
 *
 * The archive-product.php file provides the Bootstrap layout (sidebar + product
 * grid) and is captured via output buffering, then injected into the parent
 * theme's page template — the same pattern as wc_bootstrap_render_page().
 *
 * @since 0.1.0
 */
function wc_bootstrap_render_product_archive(): void {
    $is_shop = is_post_type_archive( 'product' ) || is_page( wc_get_page_id( 'shop' ) );
    $is_tax  = function_exists( 'is_product_taxonomy' ) && is_product_taxonomy();

    if ( ! $is_shop && ! $is_tax ) {
        return;
    }

    if ( ! class_exists( '\WPBootstrap\Twig\TwigService' )
        || ! class_exists( '\WPBootstrap\Template\ContextBuilder' ) ) {
        return;
    }

    // Capture WooCommerce archive content via output buffering.
    ob_start();
    include get_stylesheet_directory() . '/woocommerce/archive-product.php';
    $content = ob_get_clean();

    // Build parent theme context and inject archive content into page shell.
    $context_builder = new \WPBootstrap\Template\ContextBuilder();
    $theme_context   = $context_builder->build();
    $twig            = \WPBootstrap\Twig\TwigService::getInstance();

    $theme_context['post'] = array_merge(
        $theme_context['post'] ?? [],
        [
            'content'   => $content,
            'title'     => '',
            'thumbnail' => '',
        ]
    );

    echo $twig->render( 'pages/page.html.twig', $theme_context );
    exit;
}
add_action( 'template_redirect', 'wc_bootstrap_render_product_archive', 11 );

/**
 * Render single product pages with Bootstrap 5 layout.
 *
 * Since the parent theme's TemplateController is blocked for single products
 * (via wp_bootstrap_should_render_template filter), we render the page ourselves
 * at priority 11 using the parent theme's TwigService and page shell.
 *
 * The single-product.php file fires WooCommerce hooks and is captured via output
 * buffering, then injected into the parent theme's page template — the same
 * pattern as wc_bootstrap_render_product_archive().
 *
 * @since 0.1.0
 */
function wc_bootstrap_render_single_product(): void {
    if ( ! function_exists( 'is_product' ) || ! is_product() ) {
        return;
    }

    if ( ! class_exists( '\WPBootstrap\Twig\TwigService' )
        || ! class_exists( '\WPBootstrap\Template\ContextBuilder' ) ) {
        return;
    }

    // Capture WooCommerce single product content via output buffering.
    ob_start();
    include get_stylesheet_directory() . '/woocommerce/single-product.php';
    $content = ob_get_clean();

    // Build parent theme context and inject product content into page shell.
    $context_builder = new \WPBootstrap\Template\ContextBuilder();
    $theme_context   = $context_builder->build();
    $twig            = \WPBootstrap\Twig\TwigService::getInstance();

    $theme_context['post'] = array_merge(
        $theme_context['post'] ?? [],
        [
            'content'   => $content,
            'title'     => '',
            'thumbnail' => '',
        ]
    );

    echo $twig->render( 'pages/page.html.twig', $theme_context );
    exit;
}
add_action( 'template_redirect', 'wc_bootstrap_render_single_product', 11 );