public static bool IsInventoryInputValid(string userInput)
{
var commandKey = "I $";
if (userInput.StartsWith(commandKey, StringComparison.InvariantCulture))
{
var userBills = userInput.Substring((commandKey.Length - 1));
if (userBills.Contains("$$"))
{
return(false);
}
else
{
var billAmounts = userBills.Split(new char[] { ' ', '$' }, StringSplitOptions.RemoveEmptyEntries);
var isValid = true;
foreach (var billAmount in billAmounts)
{
isValid = isValid && UnitedStatesTender.TryParse(billAmount, out UnitedStatesTender tender);
}
return(isValid);
}
}
return(false);
}
public InventoryCommand(string input)
{
_tenders = new List <UnitedStatesTender>();
var commandKey = "I $";
if (input.StartsWith(commandKey, StringComparison.InvariantCulture))
{
var userBills = input.Substring((commandKey.Length - 1));
var billAmounts = userBills.Split(new char[] { ' ', '$' }, StringSplitOptions.RemoveEmptyEntries);
var isValid = true;
foreach (var billAmount in billAmounts)
{
UnitedStatesTender tender = null;
isValid = isValid && UnitedStatesTender.TryParse(billAmount, out tender);
if (tender != null)
{
_tenders.Add(tender);
}
}
if (isValid == false)
{
throw new ApplicationException($"Please call IsInventoryInputValid before using this constructor. {nameof(input)} - {input}");
}
}
else
{
throw new ApplicationException($"Please call IsInventoryInputValid before using this constructor. {nameof(input)} - {input}");
}
}
protected void DisplayBalance(IReadOnlyCashTransaction balance)
{
Console.WriteLine("Machine Balance:");
var ordered = UnitedStatesTender.GetAllDefinedTenders().OrderByDescending(tender => tender.Value);
foreach (var bill in ordered)
{
Console.WriteLine($"${bill.Value} - {balance.BillCount(bill)}");
}
}
public void GivenAnEmptyBillAmountWhenTryParseThenGetExpectedTender()
{
// Arrange
var testAmount = string.Empty;
// Act
var actualResult = UnitedStatesTender.TryParse(testAmount, out UnitedStatesTender actualTender);
// Assert
Assert.False(actualResult, "Expected try parse to not work");
Assert.True(actualTender == null, "Expected null.");
}
public void GivenAValidDollarAmountWithDollarSignWhenTryParseThenGetExpectedTender()
{
// Arrange
var testAmount = "$50";
// Act
var actualResult = UnitedStatesTender.TryParse(testAmount, out UnitedStatesTender actualTender);
// Assert
Assert.True(actualResult, "Expected try parse to work");
Assert.Equal <int>(UnitedStatesTender.FiftyDollar.Value, actualTender.Value);
}
public IWithdrawalResult Withdraw(int amount, IAtmInventory inventory)
{
var withdrawTransaction = CashTransaction.Start();
var descendingUnitedStatesTenders = UnitedStatesTender.GetAllDefinedTenders().OrderByDescending(tender => tender.Value);
var transactionAmount = amount;
foreach (var tender in descendingUnitedStatesTenders)
{
var numberOfBills = transactionAmount / tender.Value;
if (numberOfBills > 0)
{
withdrawTransaction.Add(tender, numberOfBills);
transactionAmount = transactionAmount - tender.GetValue(numberOfBills);
}
if (transactionAmount == 0)
{
break;
}
if (transactionAmount < 0)
{
throw new ApplicationException($"transaction amount has gone below zero!");
}
}
// Does inventory support transaction
var isPossible = inventory.Withdraw(withdrawTransaction);
if (isPossible)
{
return(WithdrawalResult.CreateSuccessResult(withdrawTransaction));
}
else
{
return(WithdrawalResult.CreateFailureResult("insufficient funds", withdrawTransaction));
}
}
