public AmortizationReport GenerateReport(LoanEntity loan,
Dictionary <DateTime, double> paymentChangesByDate)
{
int loanLength = LoanTermCalculator.GetMonthsUntilPaid(loan).getMonthsUntilPaidOff();
ArrayList paymentDates = DateUtil.GetListOfDatesMonthApart(DateUtil.GetNow(), loanLength);
AmortizationReport report = new AmortizationReport(loan);
double balance = loan.GetCurrentBalance();
foreach (DateTime date in paymentDates)
{
DateTime balanceEffectiveDate = DateUtil.FindDateBeforeFromList(date, new List <DateTime>(paymentChangesByDate.Keys));
double paymentForDate = date == balanceEffectiveDate?loan.GetMinimumMonthlyPayment() : paymentChangesByDate[balanceEffectiveDate];
AmortizationRow row = new AmortizationRowGenerator()
.GenerateRow(report.GetReportRows().Count + 1,
balance,
loan.GetMonthlyInterestRate(),
paymentForDate,
date);
report.AddRow(row);
balance = row.GetBalance();
if (balance < 0)
{
break;
}
}
return(report);
}
public LoanTerm GetMonthsUntilPaid(LoanEntity loan)
{
return(new LoanTerm(-Math.Log(1 - (loan.GetCurrentBalance() * loan.GetMonthlyInterestRate() / loan.GetMinimumMonthlyPayment()))
/ Math.Log(1 + loan.GetMonthlyInterestRate())));
}