/**
* Buy some buyable products
*
* @param Vendable $product
* @param int $qte
* @param int $discount
* @return Cart
*/
public function buy(Sellable $product, $qte, $discount = 0)
{
$discount = abs((int) $discount);
if ($discount > 100) {
$discount = 100;
}
$this->getStorage()->set($product->getName(), $qte * ($product->getPrice() - $product->getPrice() * $discount / 100));
return $this;
}
