Opencart - how to automaticlly add product to cart when certain conditions are met -

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is possible add product(s) cart when conditions met?

for expample: condition - if in cart product category c add product x , can`t delete form cart if condition still active.

customer adds product p category c , system automaticlly adds product x in cart 2 product now.

my goal have 2 product in invoice 2 separate items then. manually adding second product not option.

there method named add under cart.php here 

catalog->controller->checkout->cart.php

in product id on user clicked out add product in cart, here can check condition product belongs category. if condition true can add option product cart using method 

$this->cart->add($optional-product_id, $quantity, $option, $recurring_id);  -> default $quantity 1. -> default $recurring_id 0. -> , $option array ($option = array()).

i hope lot.


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