<?
class Cart {
	public $inventory = array();
	
	public function __construct() {
		if (isset($_COOKIE['CART'])) {
			$this->inventory = unserialize($_COOKIE['CART']);
		}
	}
	
	public function save() {
		$cart = serialize($this->inventory);
		setcookie('CART', $cart, time() + 60 * 60 * 24 * 10);
	}
	
	public function add_new($_inv_id) {
		if (!is_numeric($_inv_id) || $_inv_id <= 0)
			return;
		if (!array_search($_inv_id, $this->inventory))
			$this->inventory[] = $_inv_id;
	}
	
	public function add($_inv_id, $_qty = 1) {
		if (!is_numeric($_inv_id) || $_inv_id <= 0)
			return;
		
		$quantity = (isset($this->inventory[$_inv_id])) ? $this->inventory[$_inv_id] : 0;
		$quantity += $_qty;
		
		$this->inventory[$_inv_id] = $quantity;
	}
	
	public function delete($_inv_id) {
		if (isset($this->inventory[$_inv_id])) {
			unset($this->inventory[$_inv_id]);
		}
	}
	
	public function clear() {
		$this->inventory = array();
		$this->save();
	}
	
	public function change($_id, $_value) {
		$_value = intval($_value);
		
		if (!$_value) {
			$this->delete($_id);
			return false;
		}
		
		if (isset($this->inventory[$_id])) {
			$test = true;
			$this->inventory[$_id] = $_value;
		}
	}
}
?>