CPT Custom permalinks

add_filter('post_type_link', 'products_type_link', 1, 3);

function products_type_link($url, $post = null, $leavename = false)
{
    // products only
        if ($post->post_type != self::CUSTOM_TYPE_NAME) {
            return $url;
        }

        $post_id = $post->ID;

        $taxonomy = 'product_type';
        $taxonomy_tag = '%' . $taxonomy . '%';

        // Check if exists the product type tag
        if (strpos($taxonomy_tag, $url) < 0) {
            // replace taxonomy tag with the term slug: /products/%product_type%/samsumng/productname
            $url = str_replace($taxonomy_tag, '', $url);
        } else {
            // Get the terms
            $terms = wp_get_post_terms($post_id, $taxonomy);

            if (is_array($terms) && sizeof($terms) > 0) {
                $category = $terms[0];
                // replace taxonomy tag with the term slug: /products/%product_type%/samsumng/productname
                $url = str_replace($taxonomy_tag, $category->slug, $url);
            }
        }

        /*
         * Brand tags
         */
        $brand = 'product_brand';
        $brand_tag = '%' . $brand . '%';

        // Check if exists the brand tag
        if (strpos($brand_tag, $url) < 0) {
            return str_replace($brand_tag, '', $url);
        }

        $brand_terms = wp_get_post_terms($post_id, $brand);

        if (is_array($brand_terms) && sizeof($brand_terms) > 0) {
            $brand_category = $brand_terms[0];
        }

        // replace brand tag with the term slug: /products/cell-phone/%product_brand%/productname
        return str_replace($brand_tag, $brand_category->slug, $url);
}

function products_add_rewrite_rules()
{
    global $wp_rewrite;
    global $wp_query;

    register_post_type('products', array(
        'label' => 'Products',
        'description' => 'GVS products and services.',
        'public' => true,
        'show_ui' => true,
        'show_in_menu' => true,
        'capability_type' => 'post',
        'hierarchical' => true,
        'rewrite' => array('slug' => 'products'),
        'query_var' => true,
        'has_archive' => true,
        'menu_position' => 6,
        'supports' => array(
            'title',
            'editor',
            'excerpt',
            'trackbacks',
            'revisions',
            'thumbnail',
            'author'),
        'labels' => array (
            'name' => 'Products',
            'singular_name' => 'product',
            'menu_name' => 'Products',
            'add_new' => 'Add product',
            'add_new_item' => 'Add New product',
            'edit' => 'Edit',
            'edit_item' => 'Edit product',
            'new_item' => 'New product',
            'view' => 'View product',
            'view_item' => 'View product',
            'search_items' => 'Search Products',
            'not_found' => 'No Products Found',
            'not_found_in_trash' => 'No Products Found in Trash',
            'parent' => 'Parent product'),
        )
    );

    register_taxonomy('product-categories', 'products', array(
        'hierarchical' => true,
        'label' => 'Product Categories',
        'show_ui' => true,
        'query_var' => true,
        'rewrite' => array('slug' => 'products'),
        'singular_label' => 'Product Category')
    );

    $wp_rewrite->extra_permastructs['products'][0] = "/products/%product_type%/%product_brand%/%products%";

        // product archive
        add_rewrite_rule("products/?$", 'index.php?post_type=products', 'top');

        /*
         * Product brands
         */
        add_rewrite_rule("products/([^/]+)/([^/]+)/?$", 'index.php?post_type=products&product_brand=$matches[2]', 'top');
        add_rewrite_rule("products/([^/]+)/([^/]+)/page/([0-9]{1,})/?$", 'index.php?post_type=products&product_brand=$matches[2]&paged=$matches[3]', 'top');

        /*
         * Product type archive
         */
        add_rewrite_rule("products/([^/]+)/?$", 'index.php?post_type=products&product_type=$matches[1]', 'top');
        add_rewrite_rule("products/([^/]+)/page/([0-9]{1,})/?$", 'index.php?post_type=products&product_type=$matches[1]&paged=$matches[1]', 'bottom'); // product type pagination

        // single product
        add_rewrite_rule("products/([^/]+)/([^/]+)/([^/]+)/?$", 'index.php?post_type=products&product_type=$matches[1]&product_brand=$matches[2]&products=$matches[3]', 'top');



    flush_rewrite_rules();
}

add_action('init', 'products_add_rewrite_rules');