public void remove_product_with_id_of(ProductSnapshot product, IBasketPricingService basket_pricing_service)
{
if (basket_contains_an_item_for(product))
{
_items.Remove(get_item_for(product));
recalculate_basket_totals(basket_pricing_service);
}
}
public void add(ProductSnapshot product_snapshot, IBasketPricingService basket_pricing_service)
{
// TODO: Check for null values and invalid data
if (basket_contains_an_item_for(product_snapshot))
{
get_item_for(product_snapshot).increase_item_quantity_by(new NonNegativeQuantity(1));
}
else
{
_items.Add(BasketItemFactory.create_item_for(product_snapshot));
}
recalculate_basket_totals(basket_pricing_service);
}
public void change_quantity_of_product(NonNegativeQuantity quantity, ProductSnapshot product_snapshot, IBasketPricingService basket_pricing_service)
{
// TODO: Check for null values and invalid data
if (basket_contains_an_item_for(product_snapshot))
{
if (quantity.is_zero())
{
remove_product_with_id_of(product_snapshot, basket_pricing_service);
}
else
{
get_item_for(product_snapshot).change_item_quantity_to(quantity);
}
recalculate_basket_totals(basket_pricing_service);
}
}
private bool basket_contains_an_item_for(ProductSnapshot product_snapshot)
{
return(_items.Any(i => i.contains(product_snapshot)));
}
private BasketItem get_item_for(ProductSnapshot product_snapshot)
{
return(_items.Where(i => i.contains(product_snapshot)).FirstOrDefault());
}
public static BasketItem create_item_for(ProductSnapshot product_snapshot)
{
return(new BasketItem(product_snapshot, new NonNegativeQuantity(1)));
}
public bool contains(ProductSnapshot product_snapshot)
{
return(_product_snapshot == product_snapshot);
}
public BasketItem(ProductSnapshot product_snapshot, NonNegativeQuantity quantity)
{
_id = Guid.NewGuid();
_product_snapshot = product_snapshot;
_quantity = quantity;
}