public virtual void ReturnMoney()
{
Money moneyToReturn = MoneyInSide.Allocate(MoneyInTransaction);
MoneyInSide -= moneyToReturn;
MoneyInTransaction = 0;
}
public virtual void BuySnack(int position)
{
if (CanBuySnack(position) != string.Empty)
{
throw new InvalidOperationException();
}
Slot slot = GetSlot(position);
slot.SnackPile = slot.SnackPile.SubtractOne();
Money change = MoneyInSide.Allocate(MoneyInTransaction - slot.SnackPile.Price);
MoneyInSide -= change;
MoneyInTransaction = 0;
}
public virtual string CanBuySnack(int position)
{
SnackPile snackPile = GetSnackPile(position);
if (snackPile.Quantity == 0)
{
return("The snack pile is empty");
}
if (MoneyInTransaction < snackPile.Price)
{
return("Not enough money");
}
if (!MoneyInSide.CanAllocate(MoneyInTransaction - snackPile.Price))
{
return("Not enough change");
}
return(string.Empty);
}
