/// <summary>
/// Calculate the tax due
/// </summary>
/// <param name="calculatorSetting"></param>
/// <param name="merchandise"></param>
/// <param name="shipping"></param>
/// <param name="insurance"></param>
/// <param name="duty"></param>
/// <param name="fees"></param>
/// <returns></returns>
public decimal CalculateTax(CalculatorSetting calculatorSetting, decimal merchandise, decimal shipping,
decimal insurance, decimal duty, decimal fees)
{
decimal tax = 0m;
decimal total = merchandise;
if (calculatorSetting.TaxCalculationMethod == Enumerations.CalculationMethodEnum.Cif)
{
total = merchandise + shipping + insurance;
}
if (calculatorSetting.TaxIncludesDuty)
{
total += duty;
}
if (calculatorSetting.TaxIncludesFees)
{
total += fees;
}
tax = total * calculatorSetting.TaxRate;
if (tax < calculatorSetting.MinimumTaxPayable)
{
tax = calculatorSetting.MinimumTaxPayable;
}
if (calculatorSetting.MaximumTaxPayable > 0 && tax > calculatorSetting.MaximumTaxPayable)
{
tax = calculatorSetting.MaximumTaxPayable;
}
return(tax);
}
/// <summary>
/// Calculate the duty
/// </summary>
/// <param name="calculatorSetting"></param>
/// <param name="merchandise"></param>
/// <param name="shipping"></param>
/// <param name="insurance"></param>
/// <returns></returns>
public decimal CalculateDuty(CalculatorSetting calculatorSetting, decimal merchandise, decimal shipping,
decimal insurance)
{
decimal duty = 0;
decimal total = merchandise;
if (calculatorSetting.DutyCalculationMethod == Enumerations.CalculationMethodEnum.Cif)
{
// includes shipping and insurance
total = merchandise + shipping + insurance;
}
if (total > calculatorSetting.DutyThreshold)
{
duty = total * calculatorSetting.DutyRate;
}
if (duty < calculatorSetting.MinimumDutyPayable)
{
duty = calculatorSetting.MinimumDutyPayable;
}
if (calculatorSetting.MaximumDutyPayable > 0 && duty > calculatorSetting.MaximumDutyPayable)
{
duty = calculatorSetting.MaximumDutyPayable;
}
return(duty);
}
/// <summary>
/// Calculate the fees
/// </summary>
/// <param name="calculatorSetting"></param>
/// <param name="merchandise"></param>
/// <returns></returns>
public decimal CalculateFees(CalculatorSetting calculatorSetting, decimal merchandise)
{
if (calculatorSetting.Fee > 0)
{
return(calculatorSetting.Fee);
}
if (calculatorSetting.FeeRate > 0)
{
// TODO: Possible fee CIF or other combination
return(merchandise * calculatorSetting.FeeRate);
}
return(0M);
}
/// <summary>
/// Calculate
/// </summary>
/// <param name="requestDto"></param>
/// <returns></returns>
public CalculateResponseDto Calculate(CalculateRequestDto requestDto)
{
CalculateResponseDto response;
_calculator = GetCalculator(requestDto.ShippingToCountryIso);
_calculatorSetting = _calculator.CalculatorSetting;
// DutyRate override
if (requestDto.DutyRate != null && requestDto.DutyRate > 0)
{
_calculatorSetting.DutyRate = requestDto.DutyRate.GetValueOrDefault();
}
// TaxRate override
if (requestDto.TaxRate != null && requestDto.TaxRate > 0)
{
_calculatorSetting.TaxRate = requestDto.TaxRate.GetValueOrDefault();
}
// intra region? Don't charge duty
if (_dbContext.Countries.FirstOrDefault(x => x.Iso == requestDto.ShippingFromCountryIso)?.RegionId ==
_dbContext.Countries.FirstOrDefault(x => x.Iso == requestDto.ShippingToCountryIso)?.RegionId)
{
_calculatorSetting.DutyApplicable = false;
}
if (_calculator.CalculatorSetting.DutyApplicable)
{
_duty = CalculateDuty(_calculatorSetting, requestDto.MerchandiseTotal, requestDto.ShippingTotal,
requestDto.InsuranceTotal.GetValueOrDefault());
}
if (_calculatorSetting.FeesApplicable)
{
_fees = CalculateFees(_calculatorSetting, requestDto.MerchandiseTotal);
}
if (_calculatorSetting.TaxApplicable)
{
_tax = CalculateTax(_calculatorSetting, requestDto.MerchandiseTotal, requestDto.ShippingTotal,
requestDto.InsuranceTotal.GetValueOrDefault(), _duty, _fees);
}
// For Canada
if (requestDto.ShippingToCountryIso.ToUpper() == Enumerations.CountryEnum.CA.ToString())
{
return(_mapper.Map(_calculatorSetting, new CanadaCalculateResponseDto()
{
Duty = _duty,
Tax = CalculateCanadianTax(requestDto.CanadianProvinceCode, requestDto.MerchandiseTotal, _duty,
Enumerations.CanadianTaxTypeEnum.Gst),
Pst = CalculateCanadianTax(requestDto.CanadianProvinceCode, requestDto.MerchandiseTotal, _duty,
Enumerations.CanadianTaxTypeEnum.Pst),
PstRate = GetCanadianPstRate(requestDto.CanadianProvinceCode)
}));
}
// Standard response
return(_mapper.Map(_calculatorSetting, new CalculateResponseDto()
{
Duty = _duty,
Tax = _tax,
Fees = _fees
}));
}
