/**
 * =============================================
 * TAB 1: MISMA MARCA
 * =============================================
 */
add_filter( 'woocommerce_product_tabs', 'woo_same_brand_products_tab' );
function woo_same_brand_products_tab( $tabs ) {
    global $product;
    $brands = wp_get_post_terms( $product->get_id(), 'pwb-brand' );
    
    if ( ! empty( $brands ) && ! is_wp_error( $brands ) ) {
        $brand = $brands[0];
        $same_brand_products = get_posts(array(
            'post_type'      => 'product',
            'posts_per_page' => -1,
            'post__not_in'   => array( $product->get_id() ),
            'tax_query'      => array(array(
                'taxonomy' => 'pwb-brand',
                'field'    => 'term_id',
                'terms'    => $brand->term_id,
            )),
        ));
        
        if ( count( $same_brand_products ) > 0 ) {
            $tabs['same_brand_tab'] = array(
                'title'     => __( 'Más de ' . $brand->name, 'woocommerce' ),
                'priority'  => 50,
                'callback'  => 'woo_same_brand_products_content'
            );
        }
    }
    return $tabs;
}

function woo_same_brand_products_content() {
    global $product;
    $brands = wp_get_post_terms( $product->get_id(), 'pwb-brand' );
    
    if ( ! empty( $brands ) && ! is_wp_error( $brands ) ) {
        $brand = $brands[0];
        $brand_link = get_term_link( $brand );
        
        $same_brand_products = new WP_Query(array(
            'post_type'      => 'product',
            'posts_per_page' => 10,
            'post__not_in'   => array( $product->get_id() ),
            'tax_query'      => array(array(
                'taxonomy' => 'pwb-brand',
                'field'    => 'term_id',
                'terms'    => $brand->term_id,
            )),
            'meta_key'       => '_stock_status',
            'meta_value'     => 'instock',
        ));
        
        if ( $same_brand_products->have_posts() ) {
            echo '<h2>Más productos de la marca ' . esc_html( $brand->name ) . '</h2>';
            woocommerce_product_loop_start();
            while ( $same_brand_products->have_posts() ) {
                $same_brand_products->the_post();
                wc_get_template_part( 'content', 'product' );
            }
            woocommerce_product_loop_end();
            echo '<div class="view-all-brand-products"><a href="' . esc_url( $brand_link ) . '" class="button">Ver todos los productos de ' . esc_html( $brand->name ) . '</a></div>';
        }
        wp_reset_postdata();
    }
}

/**
 * =============================================
 * TAB 2: PRODUCTOS SIMILARES (VERSIÓN MEJORADA - MISMA CATEGORÍA ESPECÍFICA)
 * =============================================
 */
add_filter( 'woocommerce_product_tabs', 'woo_similar_products_tab', 20 );
function woo_similar_products_tab( $tabs ) {
    global $product;
    
    // Obtener la categoría más específica del producto
    $target_category = woo_get_most_specific_category( $product->get_id() );
    
    if ( $target_category ) {
        // Verificar si hay otros productos en esa misma categoría
        $similar_products = get_posts(array(
            'post_type'      => 'product',
            'posts_per_page' => -1,
            'post__not_in'   => array( $product->get_id() ),
            'tax_query'      => array(array(
                'taxonomy' => 'product_cat',
                'field'    => 'term_id',
                'terms'    => $target_category->term_id,
                'include_children' => true,
            )),
        ));
        
        if ( count( $similar_products ) > 0 ) {
            $tabs['similar_products_tab'] = array(
                'title'     => __( 'Productos Similares', 'woocommerce' ),
                'priority'  => 51,
                'callback'  => 'woo_similar_products_tab_content'
            );
        }
    }
    return $tabs;
}

function woo_similar_products_tab_content() {
    global $product;
    
    // Obtener la categoría más específica del producto
    $target_category = woo_get_most_specific_category( $product->get_id() );
    
    if ( $target_category ) {
        $similar_products = new WP_Query(array(
            'post_type'      => 'product',
            'posts_per_page' => 10,
            'post__not_in'   => array( $product->get_id() ),
            'tax_query'      => array(array(
                'taxonomy' => 'product_cat',
                'field'    => 'term_id',
                'terms'    => $target_category->term_id,
                'include_children' => true,
            )),
            'meta_key'       => '_stock_status',
            'meta_value'     => 'instock',
            'orderby'        => 'rand',
        ));
        
        if ( $similar_products->have_posts() ) {
            echo '<h2>Productos Similares</h2>';
            echo '<p>Descubre otros productos de la misma categoría que podrían interesarte:</p>';
            
            woocommerce_product_loop_start();
            while ( $similar_products->have_posts() ) {
                $similar_products->the_post();
                wc_get_template_part( 'content', 'product' );
            }
            woocommerce_product_loop_end();
            
            // Botón para ver todos los productos de esa categoría (opcional)
            echo '<div class="view-all-category-products" style="text-align:center; margin-top:20px;">';
            echo '<a href="' . esc_url( get_term_link( $target_category ) ) . '" class="button">Ver todos los productos de ' . esc_html( $target_category->name ) . '</a>';
            echo '</div>';
        } else {
            echo '<p>No se encontraron productos similares en esta categoría.</p>';
        }
        wp_reset_postdata();
    } else {
        echo '<p>Este producto no tiene categorías asignadas.</p>';
    }
}

/**
 * Función auxiliar: Obtiene la categoría más específica del producto
 * Ej: Si el producto está en "KSA > Ordenadores > Portátiles", devuelve "Portátiles"
 */
function woo_get_most_specific_category( $product_id ) {
    $categories = wp_get_post_terms( $product_id, 'product_cat' );
    
    if ( empty( $categories ) || is_wp_error( $categories ) ) {
        return null;
    }
    
    // Buscar la categoría que NO es padre de ninguna otra
    foreach ( $categories as $possible_category ) {
        $is_parent = false;
        foreach ( $categories as $compare_category ) {
            if ( $compare_category->term_id !== $possible_category->term_id && 
                 term_is_ancestor_of( $possible_category->term_id, $compare_category->term_id, 'product_cat' ) ) {
                $is_parent = true;
                break;
            }
        }
        if ( ! $is_parent ) {
            return $possible_category;
        }
    }
    
    // Si no encuentra, devuelve la primera categoría como respaldo
    return $categories[0];
}

/**
 * TAB: NUEVOS PRODUCTOS (Novedad)
 */
add_filter( 'woocommerce_product_tabs', 'woo_new_arrivals_tab', 43 );
function woo_new_arrivals_tab( $tabs ) {
    $tabs['new_arrivals_tab'] = array(
        'title'     => __( 'Recién Llegados', 'woocommerce' ),
        'priority'  => 63,
        'callback'  => 'woo_new_arrivals_tab_content'
    );
    return $tabs;
}

function woo_new_arrivals_tab_content() {
    $new_arrivals = new WP_Query(array(
        'post_type'      => 'product',
        'posts_per_page' => 10,
        'orderby'        => 'date',
        'order'          => 'DESC',
        'meta_key'       => '_stock_status',
        'meta_value'     => 'instock',
    ));
    
    if ( $new_arrivals->have_posts() ) {
        echo '<h2>🆕 Lo último en nuestra tienda</h2>';
        echo '<p>Descubre las novedades antes que nadie:</p>';
        woocommerce_product_loop_start();
        while ( $new_arrivals->have_posts() ) {
            $new_arrivals->the_post();
            wc_get_template_part( 'content', 'product' );
        }
        woocommerce_product_loop_end();
        wp_reset_postdata();
    }
}


/**
 * TAB: PRODUCTOS EN OFERTA (Urgencia)
 */
add_filter( 'woocommerce_product_tabs', 'woo_sale_products_tab', 41 );
function woo_sale_products_tab( $tabs ) {
    $tabs['sale_products_tab'] = array(
        'title'     => __( 'Ofertas Especiales', 'woocommerce' ),
        'priority'  => 61,
        'callback'  => 'woo_sale_products_tab_content'
    );
    return $tabs;
}

function woo_sale_products_tab_content() {
    $sale_products = new WP_Query(array(
        'post_type'      => 'product',
        'posts_per_page' => 10,
        'post__in'       => wc_get_product_ids_on_sale(),
        'meta_key'       => '_stock_status',
        'meta_value'     => 'instock',
        'orderby'        => 'rand',
    ));
    
    if ( $sale_products->have_posts() ) {
        echo '<h2>Ahorra con nuestras ofertas</h2>';
        echo '<p>Precios especiales por tiempo limitado:</p>';
        woocommerce_product_loop_start();
        while ( $sale_products->have_posts() ) {
            $sale_products->the_post();
            wc_get_template_part( 'content', 'product' );
        }
        woocommerce_product_loop_end();
        wp_reset_postdata();
    } else {
        echo '<p>No hay ofertas activas en este momento. ¡Vuelve pronto!</p>';
    }
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