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<?php
class ModelTotalCategoryDiscount extends Model {
	public function getTotal(&$total_data, &$total, &$taxes) {
		$discount = 0;
AB = 0;  //tems from cat. A + cat. B = no discount
AC = 0;  //items from cat. A + cat. C= no discount
AD = NNN;//Items from cat. A + cat. D= discount
BD = MMM;//Items from cat. B + cat. D= discount
		$this->load->model('catalog/product');
		$cat = array();
		foreach ($this->cart->getProducts() as $product) {
			$categories = $this->model_catalog_product->getCategories($product['product_id']);
			foreach ($categories as $category) {
				$cat[$category] = $category;
			}
		}
		$discount = 0;
		if (isset($cat[A]) && isset($cat[B])) {
			$discount = AB;
		} elseif  (isset($cat[A]) && isset($cat[C])){
			$discount = AC;
		} elseif  (isset($cat[A]) && isset($cat[D])){
			$discount = AD;
		} elseif  (isset($cat[B]) && isset($cat[D])){
			$discount = BD;
		}
		
		if ($discount) {
			$total_data[] = array(
					'code'       => 'categorydiscount',
					'title'      => 'categorydiscount',
					'value'      => -$discount,
					'sort_order' => 0
				);

			$total -= $discount;
		}
	}
}