private static void ProcessCommandLinePurchase(string[] args, CanRack vendingMachine, PurchasePrice priceOfOneSoda, CoinBox coinBox) {
if (args.Length < 2 ) {
WriteLine("Invalid Command line parameters: must be in the form 'flavor coin1 [coin2]...");
return;
}
Flavor flavor = Flavor.LEMON;
bool isValidFlavor = vendingMachine.StocksThisFlavor(args[0], ref flavor);
if (!isValidFlavor) {
WriteLine($"{args[0]} is not a valid flavor name.");
return;
}
coinBox = AddCoinsToCoinBoxFromListOfCoins(string.Join(" ", args, 1, args.Length - 1), coinBox);
decimal valueOfCoins = 0;
for (int i=1; i<args.Length; i++) {
valueOfCoins += new Coin(args[i]).ValueOf;
}
decimal amountOfChange = valueOfCoins - priceOfOneSoda.PriceInDollars;
if (amountOfChange < 0) {
WriteLine($"You are short {-amountOfChange:C}.");
} else {
vendingMachine.RemoveACanOf(flavor);
WriteLine($"Thanks. Here is your {flavor} soda.\n");
WriteLine($"\nThe coin box contains \n{coinBox.ToString()}");
if (amountOfChange > 0) {
WriteLine($"and here is your change of {amountOfChange:C}.");
}
}
}
public bool Withdraw(Coin.Denomination coinType) {
if (CoinCount(coinType) > 0) {
box[coinType]--;
NotifyPropertyChanged();
return true;
} else {
return false;
}
}
private int CoinCount(Coin.Denomination kindOfCoin) {
var result = from coinType in box
where coinType.Key == kindOfCoin
select coinType.Value;
return result.Sum();
}
public void Deposit(Coin.Denomination coinType) {
box[coinType]++;
NotifyPropertyChanged();
}