public CalculateTransactionResult Calculate(TransactionCalculatorArgs args)
{
try
{
ValidateArguments(args);
CommonTaxHelper helper = new CommonTaxHelper(args.Lines, args.GlobalDiscountAmount, args.GlobalDiscountPct, m_calculationStratagy.TaxMethod);
CalculateTransactionResult res = processDocument(helper);
res.Success = true;
return(res);
}
catch (Exception ex)
{
return(new CalculateTransactionResult {
Success = false, Exception = ex
});
}
}
private void ValidateArguments(TransactionCalculatorArgs args)
{
if (m_calculationStratagy.TaxMethod == TaxMethods.NotSet)
{
throw new Exception("Tax Method not set properly");
}
if (args.GlobalDiscountPct != 0 && args.GlobalDiscountAmount != 0)
{
throw new Exception("Set eather Global discount percent or Global discount amount, Not both");
}
var invalidGroup = args.Lines.GroupBy(line => line.TaxCode).Select(group => new
{
Code = group.Key,
Count = group.Select(line => line.TaxRate).Distinct().Count()
}).FirstOrDefault(tc => tc.Count > 1);
if (invalidGroup != null)
{
throw new Exception(string.Format("Group '{0}' has multiple tax rates", invalidGroup.Code));
}
}