private double CalculatePotentialReturnOnInvestment(Loan loan, LoanPlanViewModel viewModel)
{
var dailyProfit = viewModel.InvestmentSum * 12 * (1 + viewModel.InvestmentInterest / 100) / 365;
var remainingDays = (loan.Term.Date - DateTime.Now).TotalDays;
return((double)(dailyProfit * remainingDays));
}
private double CalculateLoanWithSurplus(Loan loan, LoanPlanViewModel viewModel)
{
var remainingSum = loan.Sum - loan.ReturnedSum;
var remainingDays = (loan.Term.Date - DateTime.Now).TotalDays;
var dailyCharge = remainingSum / remainingDays;
var dailySurplus = viewModel.InvestmentSum / 31;
return((double)(remainingSum / (dailyCharge + dailySurplus)));
}
private string Validate(LoanPlanViewModel viewModel)
{
if (!viewModel.InvestmentSum.HasValue || viewModel.InvestmentSum <= 0)
{
return("Būtina įvesti investicijos sumą");
}
if (!viewModel.InvestmentInterest.HasValue || viewModel.InvestmentInterest <= 0)
{
return("Būtina įvesti investicijos palūkanas");
}
return(string.Empty);
}
public IActionResult SubmitPlanData(LoanPlanViewModel viewModel)
{
var validation = Validate(viewModel);
if (!string.IsNullOrEmpty(validation))
{
TempData["Error"] = validation;
ViewBag.Loans = GenerateLoanSelectList();
return(View("~/Views/LoanPlanner/LoanPlanPage.cshtml", viewModel));
}
var loan = Find(viewModel.SelectedLoanId);
var daysRemainingWithSurplus = CalculateLoanWithSurplus(loan, viewModel);
var potentialReturnOnInvestment = CalculatePotentialReturnOnInvestment(loan, viewModel);
var daysRemainingWithoutSurplus = CalculateLoanWithoutSurplus(loan);
ViewBag.FinalAnswer = CompareStrategies(daysRemainingWithSurplus, potentialReturnOnInvestment,
daysRemainingWithoutSurplus, loan);
ViewBag.Loans = GenerateLoanSelectList();
return(View("~/Views/LoanPlanner/LoanPlanPage.cshtml", viewModel));
}