private decimal CalculateForBorderMonth(TaxCalculationContext context, IncomeTaxThreshold currentValueIncomeTaxThreshold, IncomeTaxThreshold nextThreshold)
{
decimal taxValue = (currentValueIncomeTaxThreshold.ToAmount - context.TotalIncomes) * currentValueIncomeTaxThreshold.Percentage;
var remainingValueForNextThreshold = ((context.TotalIncomes + context.CurrentIncome) - nextThreshold.FromAmount) * nextThreshold.Percentage;
return(taxValue + remainingValueForNextThreshold);
}
private IncomeTaxThreshold GetCurrentValueIncomeTaxThreshold(TaxCalculationContext context, List <IncomeTaxThreshold> incomeTaxThresholds)
{
var value = (context.TotalIncomes + context.CurrentIncome);
var retval = incomeTaxThresholds.FirstOrDefault(x => x.FromAmount <= context.TotalIncomes && x.ToAmount >= value || x.ToAmount >= context.TotalIncomes);
return(retval);
}
public decimal Calculate(TaxCalculationContext context)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
var percentage = GetTaxPercentage();
return(context.CurrentIncome * percentage);
}
decimal ITaxCalculator.Calculate(TaxCalculationContext context)
{
ITaxCalculatorStrategy calculator = null;
calculator = _componentContext.ResolveKeyed <ITaxCalculatorStrategy>(context.TaxationForm);
if (calculator == null)
{
throw new DomainException($"Tax calculator for {context.TaxationForm} not found");
}
return(calculator.Calculate(context));
}
/// <summary>
/// This driver called that module which followed Builder Design Pattern
/// </summary>
/// <param name="selectedMealItems"></param>
/// <returns></returns>
public double BuildMealForUser(List <FoodMenuModel> selectedMealItems)
{
Console.WriteLine();
Console.WriteLine("You Selected Below Meal Items");
Console.WriteLine("_______________________________");
MealBuilder mealBuilder = new MealBuilder();
mealBuilder.PrepareMeal(selectedMealItems);
mealBuilder.meal.ShowItems();
var foodCost = mealBuilder.meal.GetCost();
//Calculation of Tax
var taxCalculationContext = new TaxCalculationContext(new OneStarTaxCalculator());
var taxAmount = taxCalculationContext.GetCalculatedTax(foodCost, 0.05, false);
var totalCostofFood = foodCost + taxAmount;
Console.WriteLine("Total Cost(Rs.): {0}", totalCostofFood);
Console.WriteLine("Total Tax(Rs.): {0}", taxAmount);
return(totalCostofFood);
}
public decimal Calculate(TaxCalculationContext context)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
decimal taxValue = 0;
List <IncomeTaxThreshold> incomeTaxThresholds = GetIncomeTaxThreshold();
var currentValueIncomeTaxThreshold =
GetCurrentValueIncomeTaxThreshold(context, incomeTaxThresholds);
if (IsLimitValueMonth(currentValueIncomeTaxThreshold, context))
{
IncomeTaxThreshold nextThreshold = GetNextIncomeTaxThreshold(incomeTaxThresholds, currentValueIncomeTaxThreshold);
taxValue = CalculateForBorderMonth(context, currentValueIncomeTaxThreshold, nextThreshold);
}
else
{
taxValue = CalculateForFullMonth(currentValueIncomeTaxThreshold, context);
}
return(Decimal.Round(taxValue, 2));
}
private bool IsLimitValueMonth(IncomeTaxThreshold currentValueIncomeTaxThreshold, TaxCalculationContext context)
{
var currentIncomesSum = context.TotalIncomes + context.CurrentIncome;
return(currentIncomesSum > currentValueIncomeTaxThreshold.ToAmount &&
context.TotalIncomes > currentValueIncomeTaxThreshold.FromAmount);
}
private decimal CalculateForFullMonth(IncomeTaxThreshold currentValueIncomeTaxThreshold, TaxCalculationContext context)
{
return(context.CurrentIncome * currentValueIncomeTaxThreshold.Percentage);
}
public decimal Calculate_ShouldCalculate_Success(TaxCalculationContext context)
{
_taxPercentagesService.Setup(x => x.GetGeneralIncomeTaxThresholds()).Returns(CreateThreshlds());
return(_calculatorStrategy.Calculate(context));
}
