/**
 * Helper: get all producers / subsites that are currently in the cart.
 * Returns:
 * [ blog_id => [ 'term_name' => string ] ]
 */
function ms_get_cart_producers_for_notice() {

    if ( ! WC()->cart ) {
        return array();
    }

    $producers       = array();
    $current_blog_id = get_current_blog_id();
    $has_producers   = false;

    foreach ( WC()->cart->get_cart() as $cart_item ) {

        $product_id = ! empty( $cart_item['variation_id'] )
            ? $cart_item['variation_id']
            : $cart_item['product_id'];

        // Get producer term
        $terms = wp_get_post_terms( $product_id, 'producer' );

        if ( is_wp_error( $terms ) || empty( $terms ) ) {
            continue;
        }

        $term = $terms[0];

        // Blog ID is stored as term meta, same as in your shipping function
        $producer_blog_id = (int) get_term_meta( $term->term_id, 'blog_id', true );
        if ( ! $producer_blog_id ) {
            continue;
        }

        $has_producers = true;

        if ( ! isset( $producers[ $producer_blog_id ] ) ) {
            $producers[ $producer_blog_id ] = array(
                'term_name' => $term->name,
            );
        }
    }

    // Fallback if we are on a subsite and no "producer" taxonomy was used
    if ( ! $has_producers && (int) $current_blog_id !== 1 ) {
        $producers[ $current_blog_id ] = array(
            'term_name' => get_option( 'blogname' ),
        );
    }

    return $producers;
}

/**
 * 3) Show per-producer shipping countries ("_shopinfo_versandlaender")
 *    as a WooCommerce info box on cart & checkout.
 *
 *    Example:
 *    Producer 1 versendet nach Österreich
 *    Producer 2 versendet nach Österreich und Deutschland
 */
add_action( 'woocommerce_before_cart', 'ms_cart_producer_shipping_countries_notice', 5 );
add_action( 'woocommerce_before_checkout_form', 'ms_cart_producer_shipping_countries_notice', 5 );

function ms_cart_producer_shipping_countries_notice() {

    // Frontend only
    if ( is_admin() && ! defined( 'DOING_AJAX' ) ) {
        return;
    }

    if ( ! WC()->cart || WC()->cart->is_empty() ) {
        return;
    }

    $producers = ms_get_cart_producers_for_notice();

    if ( empty( $producers ) ) {
        return;
    }

    // All WooCommerce countries (code => label)
    $countries_obj = WC()->countries;
    $all_countries = $countries_obj->get_countries();

    $lines = array();

    foreach ( $producers as $blog_id => $data ) {

        $label = ! empty( $data['term_name'] ) ? $data['term_name'] : get_blog_option( $blog_id, 'blogname' );

        // Read "_shopinfo_versandlaender" from the producer's subsite
        switch_to_blog( $blog_id );
        $shipping_countries = get_option( 'options_shopinfo_versandlaender', array() );
        restore_current_blog();

        if ( empty( $shipping_countries ) ) {
            continue;
        }

        // Normalize: can be array or comma-separated string
        if ( ! is_array( $shipping_countries ) ) {
            $shipping_countries = array_filter(
                array_map( 'trim', explode( ',', (string) $shipping_countries ) )
            );
        }

        if ( empty( $shipping_countries ) ) {
            continue;
        }

        $country_names = array();

        foreach ( $shipping_countries as $entry ) {

            $code = '';
            $label_from_acf = '';

            // ACF return format could be "value", "label" or "array"
            if ( is_array( $entry ) ) {
                if ( ! empty( $entry['value'] ) ) {
                    $code = $entry['value'];
                }
                if ( ! empty( $entry['label'] ) ) {
                    $label_from_acf = $entry['label'];
                }
            } else {
                $code = (string) $entry;
            }

            if ( $code && isset( $all_countries[ $code ] ) ) {
                $country_names[] = $all_countries[ $code ];
            } elseif ( $label_from_acf ) {
                $country_names[] = $label_from_acf;
            } elseif ( $code ) {
                // Fallback: use raw value if it's not a known code
                $country_names[] = $code;
            }
        }

        if ( empty( $country_names ) ) {
            continue;
        }

        // Turn array into "Österreich", or "Österreich und Deutschland", or
        // "Österreich, Deutschland und Italien"
        $countries_string = '';
        $count            = count( $country_names );

        if ( 1 === $count ) {
            $countries_string = $country_names[0];
        } else {
            $last             = array_pop( $country_names );
            $countries_string = implode( ', ', $country_names ) . ' und ' . $last;
        }

        $label_safe          = esc_html( $label );
        $countries_string_safe = esc_html( $countries_string );

        $lines[] = $label_safe . ' versendet nach ' . $countries_string_safe;
    }

    if ( empty( $lines ) ) {
        return;
    }

    // Build WooCommerce info box content
    $message  = '<strong>' . esc_html__( 'Versandländer der Produzenten in deinem Warenkorb', 'your-textdomain' ) . ':</strong><br>';
    $message .= implode( '<br>', $lines );

    // Show as WooCommerce "info" box (notice)
    wc_print_notice( $message, 'notice' );
}