/**
 * Render_Product Init
 *
 * @version 1.0.1
 * @package 'datalayer'
 */
if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

if ( ! class_exists( 'Render_Product' ) ) :

class Render_Product {

    /**
     * Product impressions (shop, category, tag, search, etc.)
     */
    public static function mount_measuring_product_impressions_data_layer( array $products ) {
        $data_layer = array();

        /* -----------------------------------------------------------------
         * 1. UA – impressions (legacy)
         * ----------------------------------------------------------------- */
        if ( Controller_Data_Layer::is_data_layer_ua() ) {
            $impressions = array();
            $count       = 1;

            foreach ( $products as $product ) {
                $venarticle = self::get_venarticle( $product );
                $category   = self::get_first_category( $product );
                $list       = self::get_current_list_name();

                $impressions[] = array(
                    'name'     => $product->get_name(),
                    'id'       => $product->get_sku(),          // <-- SKU for UA
                    'venarticle' => $venarticle,               // <-- custom for Emarsys
                    'sku'      => $product->get_sku(),
                    'price'    => $product->get_price(),
                    'category' => $category,
                    'list'     => $list,
                    'position' => $count,
                );
                $count++;
            }

            $data_layer = array(
                'ecommerce' => array(
                    'currencyCode' => get_option( 'woocommerce_currency' ),
                    'impressions'  => $impressions,
                ),
            );
        }

        /* -----------------------------------------------------------------
         * 2. GA4 – view_item_list
         * ----------------------------------------------------------------- */
        if ( Controller_Data_Layer::is_data_layer_ga4() ) {
            $impressions = array();
            $count       = 1;

            foreach ( $products as $product ) {
                $venarticle = self::get_venarticle( $product );
                $category   = self::get_first_category( $product );
                $list       = self::get_current_list_name();

                $impressions[] = array(
                    'item_name'       => $product->get_name(),
                    'item_id'         => $product->get_sku(),          // <-- SKU for GA4
                    'item_venarticle' => $venarticle,                 // <-- Emarsys
                    'price'           => $product->get_price(),
                    'item_category'   => $category,
                    'item_list_name'  => $list,
                    'index'           => $count,
                );
                $count++;
            }

            $currency = get_option( 'woocommerce_currency' );

            $data_layer = array(
                'event'     => 'view_item_list',
                'event_id'  => Controller_Data_Layer::generate_event_id_datalayer(),
                'ecommerce' => array(
                    'currency' => $currency,
                    'items'    => $impressions,
                ),
            );
        }

        Controller_Data_Layer::push_to_data_layer( $data_layer );
    }

    /**
     * Product detail page + related products
     */
    public static function mount_measuring_views_of_product_details_data_layer( $product, $products_related ) {
        $data_layer = array();

        /* -----------------------------------------------------------------
         * 1. UA – detail + related impressions
         * ----------------------------------------------------------------- */
        if ( Controller_Data_Layer::is_data_layer_ua() ) {
            $category = self::get_first_category( $product );

            // ---- Related products (impressions) ----
            $impressions = array();
            $count       = 1;
            foreach ( $products_related as $related ) {
                $venarticle = self::get_venarticle( $related );
                $cat        = self::get_first_category( $related );

                $impressions[] = array(
                    'name'       => $related->get_name(),
                    'id'         => $related->get_sku(),          // SKU
                    'venarticle' => $venarticle,                 // Emarsys
                    'sku'        => $related->get_sku(),
                    'price'      => $related->get_price(),
                    'category'   => $cat,
                    'list'       => 'Related Products',
                    'position'   => $count,
                );
                $count++;
            }

            $data_layer = array(
                'ecommerce' => array(
                    'currencyCode' => get_option( 'woocommerce_currency' ),
                    'impressions'  => $impressions,
                    'detail'       => array(
                        'products' => array(
                            'name'     => $product->get_name(),
                            'id'       => $product->get_id(),          // detail uses internal ID (UA spec)
                            'sku'      => $product->get_sku(),
                            'price'    => $product->get_price(),
                            'category' => $category,
                        ),
                    ),
                ),
            );
        }

        /* -----------------------------------------------------------------
         * 2. GA4 – view_item (detail only)
         * ----------------------------------------------------------------- */
        if ( Controller_Data_Layer::is_data_layer_ga4() ) {
            $category = self::get_first_category( $product );

            $data_layer = array(
                'event'     => 'view_item',
                'event_id'  => Controller_Data_Layer::generate_event_id_datalayer(),
                'ecommerce' => array(
                    'currency' => get_option( 'woocommerce_currency' ),
                    'items'    => array(
                        array(
                            'item_name'     => $product->get_name(),
                            'item_id'       => $product->get_id(),     // GA4 detail uses internal ID
                            'price'         => $product->get_price(),
                            'item_category' => $category,
                        ),
                    ),
                ),
            );
        }

        Controller_Data_Layer::push_to_data_layer( $data_layer );
    }

    /**
     * Add-to-cart (non-AJAX)
     */
    public static function mount_adding_a_product_to_a_shopping_cart_data_layer_without_ajax( $cart_item_data, $product_id, $variation_id, $quantity ) {
        $product   = wc_get_product( $product_id );
        $category  = self::get_first_category( $product );
        $venarticle = self::get_venarticle( $product );

        $data_layer = array();

        /* -----------------------------------------------------------------
         * 1. UA – addToCart
         * ----------------------------------------------------------------- */
        if ( Controller_Data_Layer::is_data_layer_ua() ) {
            $variant = '';
            if ( $product->is_type( 'variable' ) ) {
                $variant_obj = new WC_Product_Variation( $variation_id );
                $attrs       = $variant_obj->get_attributes();
                foreach ( $attrs as $key => $val ) {
                    if ( 'pa_color' === $key ) {
                        $variant = $val;
                        break;
                    }
                }
            }

            $data_layer = array(
                'event'     => 'addToCart',
                'event_id'  => Controller_Data_Layer::generate_event_id_datalayer(),
                'ecommerce' => array(
                    'currencyCode' => get_option( 'woocommerce_currency' ),
                    'add'          => array(
                        'actionField' => array( 'list' => 'Product Detail' ),
                        'products'    => array(
                            'name'       => $product->get_name(),
                            'id'         => $product->get_sku(),          // SKU
                            'venarticle' => $venarticle,                 // Emarsys
                            'sku'        => $product->get_sku(),
                            'price'      => $product->get_price(),
                            'category'   => $category,
                            'variant'    => $variant,
                            'quantity'   => $quantity,
                        ),
                    ),
                ),
            );
        }

        /* -----------------------------------------------------------------
         * 2. GA4 – add_to_cart
         * ----------------------------------------------------------------- */
        if ( Controller_Data_Layer::is_data_layer_ga4() ) {
            $variant = '';
            if ( $product->is_type( 'variable' ) ) {
                $variant_obj = new WC_Product_Variation( $variation_id );
                $attrs       = $variant_obj->get_attributes();
                foreach ( $attrs as $key => $val ) {
                    if ( 'pa_color' === $key ) {
                        $variant = $val;
                        break;
                    }
                }
            }

            $data_layer = array(
                'event'     => 'add_to_cart',
                'event_id'  => Controller_Data_Layer::generate_event_id_datalayer(),
                'ecommerce' => array(
                    'currency' => get_option( 'woocommerce_currency' ),
                    'items'    => array(
                        'item_name'       => $product->get_name(),
                        'item_id'         => $product->get_sku(),          // SKU
                        'item_venarticle' => $venarticle,                 // Emarsys
                        'price'           => $product->get_price(),
                        'item_category'   => $category,
                        'item_variant'    => $variant,
                        'item_list_name'  => 'Product Detail',
                        'index'           => 1,
                        'quantity'        => $quantity,
                    ),
                ),
            );
        }

        Controller_Data_Layer::push_to_data_layer( $data_layer );
    }

    /* -----------------------------------------------------------------
     * Helper methods – keep code DRY
     * ----------------------------------------------------------------- */
    private static function get_venarticle( $product ) {
        $ven = get_post_meta( $product->get_id(), '_venarticle', true );
        return ( $ven === 'Array' || is_array( $ven ) ) ? '' : $ven;
    }

    private static function get_first_category( $product ) {
        $ids = $product->get_category_ids();
        return ! empty( $ids ) ? get_the_category_by_ID( $ids[0] ) : '';
    }

    private static function get_current_list_name() {
        if ( is_shop() )          return 'Main Shop';
        if ( is_search() )        return 'Search';
        if ( is_product_category() ) {
            $term = get_queried_object();
            return $term ? $term->name : 'Category';
        }
        if ( is_product_tag() ) {
            $term = get_queried_object();
            return $term ? $term->name : 'Tag';
        }
        return 'Unknown List';
    }
}
endif;

/* -----------------------------------------------------------------
 * LIST META – merged from your functions.php snippet
 * ----------------------------------------------------------------- */
add_action( 'wp_head', function() {
    if ( ! ( is_shop() || is_product_category() || is_product_tag() || is_front_page() ) ) {
        return;
    }

    $list_id   = 'unknown';
    $list_name = 'Unknown List';

    if ( is_shop() ) {
        $list_id   = 'shop';
        $list_name = 'Main Shop';
    } elseif ( is_product_category() ) {
        $term      = get_queried_object();
        $list_id   = 'category-' . $term->slug;
        $list_name = $term->name;
    } elseif ( is_product_tag() ) {
        $term      = get_queried_object();
        $list_id   = 'tag-' . $term->slug;
        $list_name = $term->name;
    } elseif ( is_front_page() ) {
        global $post;
        if ( $post && has_shortcode( $post->post_content, 'fusion_woo_featured_products_slider' ) ) {
            $list_id   = 'homepage-featured';
            $list_name = 'Featured Products';
        } else {
            $list_id   = 'homepage';
            $list_name = 'Homepage';
        }
    }

    $GLOBALS['tf_item_list_meta'] = [
        'item_list_id'   => $list_id,
        'item_list_name' => $list_name,
    ];
}, 5 );

add_filter( 'wc_datalayer_view_item_list_payload', function( $payload ) {
    if ( empty( $GLOBALS['tf_item_list_meta'] ) ) {
        return $payload;
    }
    $meta = $GLOBALS['tf_item_list_meta'];

    // GA4 – add top-level + per-item fields
    if ( isset( $payload['ecommerce']['items'] ) ) {
        $payload['ecommerce']['item_list_id']   = $meta['item_list_id'];
        $payload['ecommerce']['item_list_name'] = $meta['item_list_name'];

        foreach ( $payload['ecommerce']['items'] as &$item ) {
            $item['item_list_id']   = $meta['item_list_id'];
            $item['item_list_name'] = $meta['item_list_name'];
        }
        unset( $item );
    }

    return $payload;
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