public async Task <OperationResult <TaxCalculationResponse> > CalculateTax(TaxCalculationRequest request)
{
OperationResult <TaxCalculationResponse> validatorResult = _validationRuleEngine.Validate(request);
if (validatorResult.HasErrors)
{
return(validatorResult);
}
var calculationTypeMapping = await _calculationMappingRepository.GetByPostalCodeAsync(request.PostalCode).ConfigureAwait(false);
var taxCalculator = _taxCalculatorFactory.GetCalculator(calculationTypeMapping.CalculationType);
var taxYear = await _taxYearRepository.GetTaxYearAsync(_clock.GetCurrentDateTime()).ConfigureAwait(false);
var taxAmountResult = await taxCalculator.CalculateTaxAsync(taxYear, request.AnnualIncome).ConfigureAwait(false);
if (taxAmountResult.HasErrors)
{
return(taxAmountResult.MapErrors <TaxCalculationResponse>());
}
var response = new TaxCalculationResponse
{
TaxYear = taxYear.ToString(),
CalculationType = calculationTypeMapping.CalculationType,
TaxAmount = taxAmountResult.Response
};
await SaveCalculation(request, response, taxYear);
return(new OperationResult <TaxCalculationResponse>(response));
}
public double CalculateTotal(Order o)
{
//use a factory or ServiceLocator...
var taxCalc = _taxCalculatorFactory.GetCalculator(o);
var taxAmount = taxCalc.Calculate(o);
// other logic here as needed...
return(o.Items.Sum(i => i.Price) + taxAmount);
}