public static NetIncome Generate(IGrossIncome grossIncome, IncomeTax incomeTax)
{
return(new NetIncome()
{
Amount = grossIncome.Amount - incomeTax.Amount
});
}
public static IncomeTax Generate(ITaxTable taxTable, IGrossIncome grossIncome, IPayPeriod payPeriod)
{
return(new IncomeTax()
{
Amount = TaxTableCalculator.GetTaxForPeriod(payPeriod, grossIncome, taxTable)
});
}
public static int GetTaxForPeriod(IPayPeriod payPeriod, IGrossIncome grossIncome, ITaxTable taxTable)
{
var taxBracket = GetTaxBracket(grossIncome, taxTable);
var accumulatedTax = taxBracket.AccumulatedTaxFromPreviousBracket;
var marginalTax = (grossIncome.AnnualAmount - taxBracket.LowerLimit) * taxBracket.MarginalTaxRate;
var totalTax = (accumulatedTax + marginalTax) * DateCalculator.GetPayPeriodAsAFractionOfAYear(payPeriod);
return(totalTax.Rounding());
}
public static Super Generate(string superRate, IGrossIncome grossIncome)
{
if (string.IsNullOrWhiteSpace(superRate))
{
throw new Exception("Super must be greater than 0");
}
if (superRate.Contains('%'))
{
var indexOfPercentageSign = superRate.IndexOf('%');
superRate = superRate.Substring(0, indexOfPercentageSign);
}
var superRateAsANumber = ConvertSuperStringToNumber(superRate);
var superOverPeriod = SuperCalculator.GetSuper(superRateAsANumber, grossIncome);
return(new Super {
Amount = superOverPeriod
});
}
public static PaySlip Create(IEmployeeDetails employeeDetails, IPayPeriod payPeriod, IGrossIncome grossIncome,
IIncomeTax incomeTax, INetIncome netIncome, ISuper super)
{
return(new PaySlip()
{
FullName = FullNameBuilder.Combine(employeeDetails),
PayPeriod = DateCalculator.GetDateString(payPeriod),
GrossIncome = grossIncome.Amount,
IncomeTax = incomeTax.Amount,
NetIncome = netIncome.Amount,
Super = super.Amount
});
}
private static ITaxBracket GetTaxBracket(IGrossIncome grossIncome, ITaxTable taxTable)
{
return(taxTable.TaxBrackets.Single(t =>
grossIncome.AnnualAmount > t.LowerLimit && grossIncome.AnnualAmount <= t.UpperLimit));
}
public static int GetSuper(decimal superRate, IGrossIncome grossIncome)
{
var superAmount = grossIncome.Amount * (superRate / 100M);
return(superAmount.Rounding());
}
