如何在codeigniter中为具有类别树名的产品制作url结构

Question

I would like to make url structure for products with their categories tree structure like below.

www.site.com/main-category/sub-category/sub-category/.../product-name

Already I have defined in route.php for pages like

$route['(:any)'] = function ($slug) {
        return 'Page/show/'.$slug; };

Now what i should do for products ?