/**
 * Simple Add YouTube Video to WooCommerce Product
 * https://wpgenie.org
 * this code snippet goes to themes\child-theme\functions.php
*/

/**
 * 1. BACKEND: Add a Custom Meta Box for YouTube Video ID
 * 
 */
add_action( 'add_meta_boxes', 'add_wc_youtube_video_meta_box' );
function add_wc_youtube_video_meta_box() {
    add_meta_box(
        'wc_youtube_product_video',
        __( 'Product YouTube Video', 'woocommerce' ),
        'render_wc_youtube_video_meta_box',
        'product',
        'side', // Places it in the sidebar near the Product Gallery
        'low'
    );
}


function render_wc_youtube_video_meta_box( $post ) {

    $video_id = get_post_meta( $post->ID, '_product_youtube_id', true );
    wp_nonce_field( 'save_wc_youtube_video_meta', 'wc_youtube_video_nonce' );
    
    echo '
' . __( 'YouTube Video ID:', 'woocommerce' ) . '
';
    echo '';
    echo '
' . __( 'Paste only the 11-character video ID (the part after "v=" in the URL).', 'woocommerce' ) . '
';
}

/**
 * 2. BACKEND: Save the YouTube Video ID when the product is saved
 */
add_action( 'woocommerce_process_product_meta', 'save_wc_youtube_video_meta' );
function save_wc_youtube_video_meta( $post_id ) {

    if ( ! isset( $_POST['wc_youtube_video_nonce'] ) || ! wp_verify_nonce( $_POST['wc_youtube_video_nonce'], 'save_wc_youtube_video_meta' ) ) {
        return;
    }

    if ( isset( $_POST['product_youtube_id'] ) ) {
        $video_id = sanitize_text_field( $_POST['product_youtube_id'] );
        update_post_meta( $post_id, '_product_youtube_id', $video_id );
    }
}

/**
 * 3. FRONTEND: Hook the YouTube Video above the Product Gallery
 * WooCommerce outputs the gallery at priority 20. Setting this to 15 pushes it directly above it.
 */

/**
 * Hook: woocommerce_single_product_summary.
 *
 * @hooked woocommerce_template_single_title - 5
 * @hooked woocommerce_template_single_rating - 10
 * @hooked woocommerce_template_single_price - 10
 * @hooked woocommerce_template_single_excerpt - 20
 * @hooked woocommerce_template_single_add_to_cart - 30
 * @hooked woocommerce_template_single_meta - 40
 * @hooked woocommerce_template_single_sharing - 50
 * @hooked WC_Structured_Data::generate_product_data() - 60
 */

add_action( 'woocommerce_single_product_summary', 'display_youtube_video_above_gallery', 15 );
function display_youtube_video_above_gallery() {

    global $product;
    
	if ( ! $product ) {
        return;
    }

    // Fetch the Video ID
    $video_id = get_post_meta( $product->get_id(), '_product_youtube_id', true );

    // If an ID exists, output the responsive player
    if ( ! empty( $video_id ) ) {
        ?>