public static void PrintPayments(IEnumerable <MonthPayment> monthPayments, bool withPaymentsDetails = false)
{
MonthPayment prev = null;
bool todayPrined = false;
decimal totalInterest = 0;
decimal totalPaid = 0;
decimal totalInvest = 0;
decimal totalInvestGrn = 0;
int mI = 1;
int pI = 1;
foreach (var m in monthPayments)
{
decimal body = prev != null ? m.Paid - prev.Interest : 0;
decimal interest = prev != null ? prev.Interest : 0;
decimal debt = m.Debt - body;
if (m.Date > DateTime.Today && todayPrined == false)
{
Trace.WriteLine("");
Trace.WriteLine("For today:");
Trace.WriteLine("----------");
Trace.WriteLine(string.Format(
"Total paid:\t\t{0,12:0.00}\nTotal body:\t\t{1,12:0.00}\nTotal interest:\t{2,12:0.00}\nTotal invest:\t{3,12:0.00} usd = {4:0.00} uah",
totalPaid, totalPaid - totalInterest, totalInterest, totalInvest, totalInvestGrn));
Trace.WriteLine("");
todayPrined = true;
}
totalInterest += interest;
totalPaid += m.Paid;
totalInvest += m.Invest;
totalInvestGrn += m.InvestGrn;
string investStr = m.Invest != 0 ? string.Format("invest: {0:0.00} usd, {1:0.00} uah", m.Invest, m.InvestGrn) : "";
Trace.WriteLine(
string.Format(
"{0,2} {1,15:MMMM yyyy} {2,12:0.00} {3,9:0.00} {4,9:0.00} {5,9:0.00} {6} {7}",
mI++, m.Date, debt, interest, body, m.Paid, m.InvalidCalculation ? "+" : "", investStr));
if (withPaymentsDetails && m.Payments != null)
{
foreach (var p in m.Payments)
{
Trace.WriteLine(string.Format("\t\t\t\t\t\t\t{0} {1,15:dd/MM/yyyy} {2,12:0.00} {3}", pI++, p.PaymentDate, p.PayAmount, PrintInvest(p)));
}
}
prev = m;
}
Trace.WriteLine("");
Trace.WriteLine(string.Format(
"Total paid:\t\t{0,12:0.00}\nTotal body:\t\t{1,12:0.00}\nTotal interest:\t{2,12:0.00}\nTotal invest:\t{3,12:0.00} usd = {4:0.00} uah",
totalPaid, totalPaid - totalInterest, totalInterest, totalInvest, totalInvestGrn));
}
/// <summary>
/// Calculate mothly payments
/// </summary>
/// <param name="payments">payments array</param>
/// <param name="startDate">first payment date</param>
/// <param name="debtAmount">debt amount</param>
/// <param name="withInvest">true - use ivestments during calculation, false - calculate without investments</param>
/// <returns></returns>
public MonthPayment[] Calculate(Payment[] payments, DateTime startDate, decimal debtAmount, bool withInvest = true)
{
var firstDay = startDate;
const decimal interestPerHour = 12.7m / (24 * 360 * 100);
decimal debt = debtAmount;
var list = new List <MonthPayment>();
int i = 0;
MonthPayment prevM = null;
while (debt > 0 && i < payments.Length)
{
var m = new MonthPayment();
list.Add(m);
m.Debt = debt;
m.Date = firstDay;
DateTime nextMonth = new DateTime(firstDay.Year, firstDay.Month, 1).AddMonths(1);
if (payments[i].PaymentDate > nextMonth)
{
m.Interest = debt * interestPerHour * (decimal)(nextMonth - firstDay).TotalHours;
firstDay = nextMonth;
prevM = m;
continue;
}
int j = 0;
var paymentsList = new List <Payment>();
decimal prevInterest = prevM != null ? prevM.Interest : 0;
decimal invetstMultyplier = withInvest ? 1 : 0;
while (i < payments.Length && payments[i].PaymentDate < nextMonth)
{
if (payments[i].Interest != null && prevM != null &&
Math.Abs(prevM.Difference = (payments[i].Interest.Value - prevM.Interest)) > 0.006m &&
prevM.InvalidCalculation == false)
{
prevM.InvalidCalculation = true;
}
paymentsList.Add(payments[i].Clone());
DateTime beginDate = j == 0 ? firstDay : payments[i - 1].PaymentDateWithShift;
m.Interest += debt * interestPerHour * (decimal)(payments[i].PaymentDateWithShift - beginDate).TotalHours;
m.Invest += payments[i].Invest * invetstMultyplier;
m.InvestGrn += payments[i].InvestGrn * invetstMultyplier;
decimal invest = payments[i].Invest * (invetstMultyplier);
decimal payAmount = payments[i].PayAmount + (invest > 0 ? invest : 0);
if (payAmount >= prevInterest)
{
debt -= (payAmount - prevInterest);
prevInterest = 0;
}
else
{
prevInterest -= payAmount;
}
m.Paid += payAmount;
i++;
j++;
}
m.Payments = paymentsList.ToArray();
m.Interest += debt * interestPerHour * (decimal)(nextMonth - payments[i - 1].PaymentDateWithShift).TotalHours;
firstDay = nextMonth;
prevM = m;
}
return(list.ToArray());
}