public async Task Calculate(ICreditRepository repository)
{
var credit = await repository.GetCreditAsync();
bool isFirst = true;
decimal priorInterestToRepay = 0;
var debt = credit.AmountOfCredit;
var k = credit.AnnualLendingRate / 1200;
var q = 1 + k;
var qPowLol = q.Pow(credit.LifeOfLoan);
int month = 1;
var installment = debt * qPowLol * (q - 1) / (qPowLol - 1); // rata
var results = new List <FinancialResult>();
while (debt > 1)
{
var result = new FinancialResult();
result.MonthNumber = month.ToString();
result.InterestPartOfInstallment = (debt * k).Stringify(); // odsetki będące częścią raty
result.CapitalPartOfInstallment = (installment - debt * k).Stringify(); // kapitał do spłacenia będący częścią raty
result.CapitalToRepay = (debt - installment + debt * k).Stringify();
priorInterestToRepay = isFirst
? installment * credit.LifeOfLoan - debt - debt * k
: priorInterestToRepay - debt * k;
result.InterestToRepay = priorInterestToRepay.Stringify();
// result.Installment = (debt*k).RoundTo2() + (installment - debt*k).RoundTo2() > installment.RoundTo2()
// ? (installment.RoundTo2() + 0.01m).Stringify()
// : installment.RoundTo2().Stringify();
debt = debt - installment + debt * k;
isFirst = false;
month++;
await repository.AddFinancialResultAsync(result);
}
}
