Show final price in search results

I have a livesearch which bring me 4 results with : Image + Name + Price. For price i mananged to calculate standard price + taxes but i don't know how opencart display the final price (normal price + taxes + discounts + special offer).

This is my search file from controller. https://gist.github.com/anonymous/a314207e92bd4d705e03

The last line from file is where i get the price + taxes. I want to know how can i calculate the full price if the product has a discount and/or special offer.

This is how my search look : http://prntscr.com/876pex