/// <summary>
/// User presses "buy now"
/// </summary>
public void ConfirmSell()
{
Error = null;
if (_state != ControlUnitState.Transaction) // if not in payment mode - do nothing
{
if (_state == ControlUnitState.Ready)
{
Error = "CHOOSE DRINK FIRST!";
RaiseDisplayChanged();
}
return;
}
if (TransactionAmount100 < ChosenProduct.Price100) // if there's not enough money - do nothing
{
Error = "NOT ENOUGH MONEY!";
RaiseDisplayChanged();
return;
}
var change = _cashBox.GiveChange(TransactionAmount - ChosenProduct.Price); // get change
if (change == null) //there no change
{
change = _cashBox.GiveChange(TransactionAmount); // return transaction amount back
if (change == null)
{
Error = "NO CASH FOR CHANGE";
RaiseDisplayChanged();
}
else
{
foreach (var coin in change)
{
RaiseCashReturn(coin);
}
}
_state = ControlUnitState.Ready;
}
else
{
foreach (var coin in change) // return change
{
RaiseCashReturn(coin);
}
ChosenProduct.TotalSold++; // update product statistics
ChosenProduct.Count--;
if (ChosenProduct.Count == 0)
{
ChosenProduct.OutOfStock = true;
RaiseOutOfStock(ProductSlot);
}
StartProductRelease(); // start releasing product
_state = ControlUnitState.Release;
}
RaiseDisplayChanged();
}
private ControlUnit()
{
_cashBox = new CashBox();
_vendingProcessor = new VendingProcessor();
_state = ControlUnitState.Ready;
}
/// <summary>
/// Moves machine to operational mode
/// </summary>
public void ToOperational()
{
Error = null;
_state = ControlUnitState.Ready;
RaiseOnRestart();
RaiseDisplayChanged();
}
/// <summary>
/// Moves machine to maintenance mode
/// </summary>
public void ToMaintenance()
{
Refund();
_state = ControlUnitState.Maintenance;
RaiseDisplayChanged();
}
/// <summary>
/// User chooses drink
/// </summary>
/// <param name="slot"></param>
public void ChooseDrink(int slot)
{
Error = null;
if (_state == ControlUnitState.Ready || (_state == ControlUnitState.Transaction && TransactionAmount100 == 0)) // User can choose drink in appropriate mode or if he didn't start paying
{
if (slot >= _vendingProcessor.ProductSlots.Length)
{
return;
}
var p = _vendingProcessor.ProductSlots[slot];
if (p.OutOfStock || p.Count == 0)
{
Error = "OUT OF STOCK";
RaiseDisplayChanged();
return;
}
ProductSlot = slot;
_state = ControlUnitState.Transaction; // Move to payment mode
TransactionAmount100 = 0;
NoChange = false;
RaiseDisplayChanged();
}
else if (_state == ControlUnitState.Transaction && TransactionAmount100 > 0)
{
Error = "PRESS REFUND \n FOR ANOTHER DRINK";
RaiseDisplayChanged();
}
}
/// <summary>
/// Starts product release procedure to feel realistic process (takes 3 seconds)
/// </summary>
private void StartProductRelease()
{
_state = ControlUnitState.Release;
var timer = new Timer(3000);
timer.Elapsed += new ElapsedEventHandler(timer_Elapsed);
timer.Start();
}
private void timer_Elapsed(object sender, ElapsedEventArgs e)
{
((Timer)sender).Enabled = false;
_state = ControlUnitState.Finalize;
Dispatcher.Invoke(new Action(delegate() {
RaiseProductRelease(ChosenProduct);
RaiseDisplayChanged();
}));
}
/// <summary>
/// User presses refund button
/// </summary>
public void Refund()
{
Error = null;
if (_state == ControlUnitState.Transaction) // if was in payment mode
{
var coins = _cashBox.GiveChange(TransactionAmount); // calculate minimum number of coins to return as if it was a change for full transaction amount
if (coins != null)
{
foreach (var coin in coins)
{
RaiseCashReturn(coin); // return each coin
}
}
else
{
//error!
}
_state = ControlUnitState.Ready;
RaiseDisplayChanged();
}
}
/// <summary>
/// User took the product
/// </summary>
public void SellFinished()
{
Error = null;
_state = ControlUnitState.Ready;
RaiseDisplayChanged();
}