private decimal CalculateGrossAmount(InvestmentParameter parameter)
{
var dailyInterestRate = CalculateDailyRate(parameter);
var periodInterestRate = Math.Pow(1 + dailyInterestRate, parameter.MaturityBusinessDays);
return(parameter.InvestedAmount * (decimal)periodInterestRate);
}
public InvestmentResult Simulate(InvestmentParameter parameter)
{
var taxRate = GetTaxRate(parameter);
var grossAmount = CalculateGrossAmount(parameter);
var investmentResult = new InvestmentResult(parameter, grossAmount, taxRate)
{
DailyGrossRateProfit = (decimal)CalculateDailyRate(parameter)
};
return(investmentResult);
}
private decimal GetTaxRate(InvestmentParameter parameter)
{
const decimal AMOUNT_TAX_FREE = 0;
if (parameter.IsTaxFree)
{
return(AMOUNT_TAX_FREE);
}
return(new IncomeTaxRules().GetIncomeTaxRate(parameter.MaturityTotalDays));
}
public InvestmentResult(InvestmentParameter investmentParameter, decimal grossAmount, decimal taxesRate)
{
InvestmentParameter = investmentParameter;
GrossAmount = Math.Round(grossAmount, DomainConstants.DEFAULT_ROUND);
TaxesRate = taxesRate;
}
private double CalculatePeriod(InvestmentParameter parameter, double period)
{
var rate = Math.Pow(1 + parameter.YearlyInterestRate / 100, 1.0f / period) - 1;
return(rate * parameter.Rate / 100);
}
private double CalculateAnnualyRate(InvestmentParameter parameter)
{
return(CalculatePeriod(parameter, 1));
}
private double CalculateMonthlyRate(InvestmentParameter parameter)
{
const int MONTHS_IN_YEAR = 12;
return(CalculatePeriod(parameter, MONTHS_IN_YEAR));
}
private double CalculateDailyRate(InvestmentParameter parameter)
{
return(CalculatePeriod(parameter, DomainConstants.BUSINESS_DAYS_PER_YEAR));
}
