//When a new OrderItem is added, subtotal, tax, and total are
//automatically updated.
public void AddItemToOrder(OrderItem newOrderItem)
{
bool addItemToOrder = true;
if (newOrderItem != null)
{
if (newOrderItem is Drink)
{
Drink drinkToAdd = (Drink)newOrderItem;
if (UpdateDrinkIfAlreadyOnOrder(drinkToAdd))
{
addItemToOrder = false;
}
}
else if (newOrderItem is Dessert)
{
Dessert dessertToAdd = (Dessert)newOrderItem;
if (UpdateDessertIfAlreadyOnOrder(dessertToAdd))
{
addItemToOrder = false;
}
}
else if (newOrderItem is Pizza)
{
Pizza pizzaToAdd = (Pizza)newOrderItem;
if (UpdatePizzaIfAlreadyOnOrder(pizzaToAdd))
{
addItemToOrder = false;
}
}
else if (newOrderItem is Calzone)
{
Calzone calzoneToAdd = (Calzone)newOrderItem;
if (UpdateCalzoneIfAlreadyOnOrder(calzoneToAdd))
{
addItemToOrder = false;
}
}
else if (newOrderItem is Salad)
{
Salad saladToAdd = (Salad)newOrderItem;
if (UpdateSaladIfAlreadyOnOrder(saladToAdd))
{
addItemToOrder = false;
}
}
if (addItemToOrder)
{
newOrderItem.OrderItemNumber = OrderItems.Count + 1;
OrderItems.Add(newOrderItem);
}
UpdateOrderTotals();
MenuHeaderModel.Instance.OrderTotal = Total;
}
}
public bool UpdateDessertIfAlreadyOnOrder(Dessert dessertToAdd)
{
foreach (var orderItem in OrderItems)
{
if (orderItem is Dessert)
{
Dessert dessertAlreadyOnOrder = (Dessert)orderItem;
if (dessertToAdd.DessertType == dessertAlreadyOnOrder.DessertType)
{
if (EditingExistingOrder)
{
orderItem.ItemCount = dessertToAdd.ItemCount;
}
else
{
orderItem.ItemCount++;
}
return(true);
}
}
}
return(false);
}
