FoxyShop: URL Customization

//FoxyShop URL Customization (FoxyShop 4.2+ required)
//This code will add the product category to the url.
//IMPORTANT: put this in your wp-config.php file:
//define('FOXYSHOP_PRODUCTS_SLUG','products/%foxyshop_categories%');

add_filter( 'post_type_link', 'custom_foxyshop_product_link', 10, 3 );

function custom_foxyshop_product_link( $permalink, $post, $leavename ) {
    global $wp_query;
    $term_url = '';
    $rewritecode = array(
        '%foxyshop_categories%',
        $leavename ? '' : '%postname%',
    );
    $post_id = $post;
    $post = get_post( $post_id );

    // Only applies to Foxyshop products, don't stop on permalinks of other CPTs
    if ($post->post_type != 'foxyshop_product')
        return $permalink;

    $permalink_structure = get_option( 'permalink_structure' );

    $our_permalink_structure = FOXYSHOP_PRODUCTS_SLUG . "/%postname%/";

    if ( '' != $permalink_structure && !in_array( $post->post_status, array( 'draft', 'pending' ) ) ) {

        $post_name = $post->post_name;

        $product_categories = wp_get_post_terms($post->ID, 'foxyshop_categories');
        $category_name = "";
        foreach($product_categories as $term) {
            $category_name = $term->slug;

            if ($term->parent > 0) {
                $parent_cats = get_ancestors($term->term_id, 'foxyshop_categories');
                foreach($parent_cats as $parent_id) {
                    $parent_term = get_term_by('id',$parent_id,'foxyshop_categories');
                    $category_name = $parent_term->slug . "/" . $category_name;
                }
            }
            continue;
        }

        if ($category_name == '') $category_name = "uncategorized";

        $rewritereplace = array(
            $category_name,
            $post_name
        );

        $permalink = str_replace( $rewritecode, $rewritereplace, $our_permalink_structure );
        $permalink = user_trailingslashit( $permalink, 'single' );
        $permalink = home_url( $permalink );

    }
    return apply_filters( 'foxyshop_product_permalink', $permalink, $post->ID );
}


add_filter('foxyshop_product_url_slug', 'my_foxyshop_product_url_slug', 10, 2);
function my_foxyshop_product_url_slug($slug, $id) {
    if (strpos($slug, '%foxyshop_categories%') !== false) {
        $product_categories = wp_get_post_terms($id, 'foxyshop_categories');
        $category_name = "";
        foreach($product_categories as $term) {
            $category_name = $term->slug;
            if ($term->parent > 0) {
                $parent_cats = get_ancestors($term->term_id, 'foxyshop_categories');
                foreach($parent_cats as $parent_id) {
                    $parent_term = get_term_by('id',$parent_id,'foxyshop_categories');
                    $category_name = $parent_term->slug . "/" . $category_name;
                }
            }
            continue;
        }
        if (!$category_name) $category_name = "base";
        $slug = str_replace('%foxyshop_categories%', $category_name, $slug);
    }
    return $slug;
}

add_filter('foxyshop_template_redirect_product_slug', 'my_foxyshop_template_redirect_product_slug');
function my_foxyshop_template_redirect_product_slug($str) {
    return str_replace('/%foxyshop_categories%', '', $str);
}