//public virtual void LoadSnacks(int position, Snack snack, int quantity, decimal price)
public virtual void LoadSnacks(int position, SnackPile snackPile)
{
Slot slot = GetSlot(position);
//slot.Snack = snack;
//slot.Quantity = quantity;
//slot.Price = price;
slot.SnackPile = snackPile;
slot.Position = position;
}
public Slot(SnackMachine snackMachine, int position)
//public Slot(SnackMachine snackMachine, int position, Snack snack, int quantity, decimal price)
: this()
{
SnackMachine = snackMachine;
Position = position;
//Snack = snack ;
//Quantity = quantity;
//Price = price;
//SnackPile = new SnackPile(Snack.None, 0, 0m);
SnackPile = SnackPile.EmptySnackPile;
}
/***********************************************************************************************
* Command-query separation principle (a part from some cases : e.g. removing a file!)
* - BuySnack (Commands are void) : doesn't return value : just side effects (i.e. mutates objects state)
* - CanBuySnack (Queries are non-void ): return a boolean value with no side effects
************************************************************************************************/
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);
}