function filter_attributes_by_category_shortcode($atts) {
    // Shortcode attributes
    $atts = shortcode_atts(array(), $atts, 'filter_attributes_by_category');

    // Get current category
    if (is_product_category()) {
        $category = get_queried_object();
    } else {
        return '<p>This filter only works on product category pages.</p>';
    }

    // Get products in the specified category
    $args = array(
        'post_type' => 'product',
        'posts_per_page' => -1,
        'tax_query' => array(
            array(
                'taxonomy' => 'product_cat',
                'field' => 'slug',
                'terms' => $category->slug,
            ),
        ),
    );

    $products = new WP_Query($args);
    if (!$products->have_posts()) {
        return '<p>No products found in this category.</p>';
    }

    $attributes = array();

    // Loop through the products to get their attributes
    while ($products->have_posts()) : $products->the_post();
        $product = wc_get_product(get_the_ID());
        $product_attributes = $product->get_attributes();

        foreach ($product_attributes as $attribute) {
            if ($attribute->is_taxonomy()) {
                $taxonomy = $attribute->get_taxonomy_object();
                $terms = wp_get_post_terms($product->get_id(), $attribute->get_name(), 'all');

                foreach ($terms as $term) {
                    if (!isset($attributes[$taxonomy->attribute_label])) {
                        $attributes[$taxonomy->attribute_label] = array();
                    }
                    $attributes[$taxonomy->attribute_label][$term->term_id] = $term->name;
                }
            }
        }
    endwhile;
    wp_reset_postdata();

    // Generate the filter form
    $output = '<form method="GET" action="' . esc_url(home_url('/f')) . '">';
    foreach ($attributes as $attribute_label => $terms) {
        if (!empty($terms)) {
            $output .= '<label for="' . esc_attr(sanitize_title($attribute_label)) . '">' . esc_html($attribute_label) . ':</label>';
            $output .= '<select name="' . esc_attr(sanitize_title($attribute_label)) . '" id="' . esc_attr(sanitize_title($attribute_label)) . '">';
            $output .= '<option value="">' . __('Select', 'woocommerce') . '</option>';

            foreach ($terms as $term_id => $term_name) {
                $selected = isset($_GET[sanitize_title($attribute_label)]) && $_GET[sanitize_title($attribute_label)] == $term_name ? ' selected' : '';
                $output .= '<option value="' . esc_attr($term_name) . '"' . $selected . '>' . esc_html($term_name) . '</option>';
            }

            $output .= '</select><br>';
        }
    }

    $output .= '<button type="submit">' . __('Filter', 'woocommerce') . '</button>';
    $output .= '</form>';

    return $output;
}
add_shortcode('filter_attributes_by_category', 'filter_attributes_by_category_shortcode');

function filter_products_by_attributes($query) {
    if (!is_admin() && $query->is_main_query() && is_tax('product_cat')) {
        $tax_query = array();

        foreach (wc_get_attribute_taxonomies() as $tax) {
            $taxonomy = wc_attribute_taxonomy_name($tax->attribute_name);

            if (isset($_GET[sanitize_title($tax->attribute_label)]) && !empty($_GET[sanitize_title($tax->attribute_label)])) {
                $term = get_term_by('name', sanitize_text_field($_GET[sanitize_title($tax->attribute_label)]), $taxonomy);
                if ($term) {
                    $tax_query[] = array(
                        'taxonomy' => $taxonomy,
                        'field'    => 'slug',
                        'terms'    => $term->slug,
                    );
                }
            }
        }

        if (!empty($tax_query)) {
            $query->set('tax_query', $tax_query);
        }
    }
}
add_action('pre_get_posts', 'filter_products_by_attributes');