Custom Cart Message

Hi there I am trying to use the filter :-

add_filter( 'wc_add_to_cart_message', 'my_cart_func', 10, 2 );

I want a pop up displaying the item they have currently added to cart similar to this site :-

http://www.chainreactioncycles.com/fox-racing-title-class-premium-tee/rp-prod118961

I can successfuly post a custom message after the cart add on the single product page no problem :-

function my_cart_func($message) {
$message = 'New Cart Message';
return $message
}

I was hoping to use the global $post to get the current post id to basically show the post contents (product title, price etc) within a lightbox but this doesnt seem to work. I can use the global $woocommerce but this doesnt give me the information I need. Is there a reason why the $post global will not work. I am a newbie to PHP so any information to put me on the right tracks would be great.

Thanks in advance
Jamie

https://ww.wp.xz.cn/plugins/woocommerce/