public void WelcomeTextIsDisplayed()
{
AppResult[] results = app.WaitForElement (c => c.Marked ("Welcome to Xamarin Forms!"));
app.Screenshot ("Welcome screen.");
Assert.IsTrue (results.Any ());
DebtManager debtManager = new DebtManager();
PaymentManager paymentManager = new PaymentManager();
debtManager.UpdateDebt(new DebtEntry("Debt 1", 25000, 5000, 2.99, 60));
debtManager.UpdateDebt(new DebtEntry("Debt 2", 190000, 180000, 3.25, 360));
debtManager.UpdateDebt(new DebtEntry("Debt 3", 190000, 180000, 3.25, 360));
debtManager.UpdateDebt(new DebtEntry("Debt 4", 190000, 180000, 3.25, 360));
debtManager.UpdateDebt(new DebtEntry("Debt 5", 190000, 180000, 3.25, 360));
debtManager.UpdateDebt(new DebtEntry("Debt 6", 190000, 180000, 3.25, 360));
debtManager.UpdateDebt(new DebtEntry("Debt 7", 190000, 180000, 3.25, 360));
debtManager.UpdateDebt(new DebtEntry("Debt 8", 190000, 180000, 3.25, 360));
debtManager.UpdateDebt(new DebtEntry("Debt 9", 190000, 180000, 3.25, 360));
debtManager.UpdateDebt(new DebtEntry("Debt 10", 190000, 180000, 3.25, 360));
paymentManager.AddSalaryEntry(70000, 0.01, new DateTime(2016, 9, 1));
paymentManager.AddSalaryEntry(40000, 0.01, new DateTime(2016, 9, 1));
paymentManager.SnowballAmount = 860;
paymentManager.AddWindfallEntry(500, new DateTime(2016, 1, 1), true, 6);
paymentManager.AddWindfallEntry(500, new DateTime(2016, 1, 1), true, 6);
new DebtSnowballCalculator().CalculateDebtSnowball(debtManager, paymentManager, true);
}
public ObservableCollection<AmortizationEntry> CalculateDebtSnowball(DebtManager debtManagerXX, PaymentManager paymentManagerXX, bool applySnowballs)
{
CreateLocalCopies(debtManagerXX, paymentManagerXX, applySnowballs);
DateTime simulatedDate = DateTime.Now;
var watch = Stopwatch.StartNew();
ObservableCollection<AmortizationEntry> col = new ObservableCollection<AmortizationEntry>();
bool allFinished = false;
simulatedDate = DateTime.Now;
// Simulate the months and apply the snowball to debts each month
while (!allFinished)
{
double salarySnowball = _localPaymentManager.GetTotalMonthlySnowball(simulatedDate);
allFinished = true;
foreach (DebtEntry debt in _localDebtManager.Debts)
{
if (debt.CurrentBalance > 0)
{
col.Add(ApplyMonthlyPayment(simulatedDate, debt, _localPaymentManager, ref salarySnowball, applySnowballs));
allFinished = false;
}
}
try {
simulatedDate = simulatedDate.AddMonths (1);
} catch (Exception ex)
{
bool dance = true;
}
}
watch.Stop();
var elapsedMs = watch.ElapsedMilliseconds;
System.Diagnostics.Debug.WriteLine("Milliseconds " + elapsedMs);
return col;
}
private DebtApp()
{
_debtManager = new DebtManager();
_paymentManager = new PaymentManager();
_debtSnowballCalculator = new DebtSnowballCalculator();
}
private AmortizationEntry ApplyMonthlyPayment(DateTime currentDate, DebtEntry debtEntry,
PaymentManager paymentManager, ref double additionalPrincipal, bool applySnowball)
{
double startingBalance = debtEntry.CurrentBalance;
double interestPortion = debtEntry.MonthlyInterest * debtEntry.CurrentBalance;
double minimumMonthlyPayment = debtEntry.MinimumMonthlyPayment;
if (debtEntry.DebtType == DebtType.CreditCard &&
minimumMonthlyPayment < debtEntry.MinimumMonthlyPaymentLimit)
{
minimumMonthlyPayment = debtEntry.MinimumMonthlyPaymentLimit;
}
double minimumPrincipal = debtEntry.MinimumMonthlyPayment - interestPortion;
double principalPortion = minimumPrincipal + additionalPrincipal;
double possibleBalance = debtEntry.CurrentBalance - principalPortion;
if (possibleBalance < 0)
{
if (minimumPrincipal >= debtEntry.CurrentBalance)
{
minimumPrincipal = debtEntry.CurrentBalance - interestPortion;
additionalPrincipal = 0;
}
else
{
additionalPrincipal = debtEntry.CurrentBalance - minimumPrincipal - interestPortion;
}
debtEntry.CurrentBalance = 0;
if (applySnowball)
{
paymentManager.WindfallEntries.Add(new WindfallEntry(string.Empty, Math.Abs(possibleBalance), currentDate.AddMonths(1)));
if (paymentManager.SnowballEntries.Count > 0)
{
paymentManager.SnowballEntries [0].Amount += debtEntry.MinimumMonthlyPayment;
}
else
{
paymentManager.SnowballEntries.Add (new SnowballEntry ("Temp", debtEntry.MinimumMonthlyPayment));
}
}
}
else if (possibleBalance > debtEntry.CurrentBalance)
{
debtEntry.Name += " INVALID!";
debtEntry.CurrentBalance = -9999;
}
else
{
debtEntry.CurrentBalance = possibleBalance;
}
AmortizationEntry output = new AmortizationEntry(
debtEntry.Name, debtEntry.DebtType, currentDate, startingBalance, interestPortion,
minimumPrincipal, additionalPrincipal, debtEntry.CurrentBalance);
// We always use up all of the additional principle, otherwise it gets added as a windfall the
// following month
additionalPrincipal = 0;
return output;
}
private void CreateLocalCopies(DebtManager debtManager, PaymentManager paymentManager, bool applySnowballs)
{
_localDebtManager = new DebtManager();
_localDebtManager.Debts = debtManager.CloneDebts();
_localPaymentManager = new PaymentManager();
if (applySnowballs)
{
_localPaymentManager.WindfallEntries = paymentManager.CloneWindfalls();
_localPaymentManager.SalaryEntries = paymentManager.CloneSalaries();
_localPaymentManager.SnowballEntries = paymentManager.CloneSnowballs ();
}
}
