private void distributeRemainders(short sign, CommonTaxHelper helper, RemainderHelper remainderHelper, IEnumerable <TaxGroupForCalculations> taxGroupsForCalculations)
{
var vatGroups = taxGroupsForCalculations.Where(x => x.PositiveOrNegative == sign);
var sortedList = vatGroups.OrderByDescending(o => o.Remainder).ThenByDescending(o => o.TotalForGroupBeforeDiscount);
int groupCounter = 0;
decimal howManyDistributions = Math.Abs(sign == POSITIVE_SIGN
? remainderHelper.RemainderSumPositive
: remainderHelper.RemainderSumNegative) / 0.01m;
foreach (TaxGroupForCalculations group in sortedList)
{
groupCounter++;
group.TotalForGroupBeforeDiscount = Math.Abs(group.TotalForGroupBeforeDiscount);
group.TruncatedDiscountAmountForGroup = Math.Abs(group.TruncatedDiscountAmountForGroup);
if (groupCounter <= howManyDistributions)
{
group.DistributedRemainder = 0.01m;
}
group.DiscountAmountForGroupWithRemainder = group.TruncatedDiscountAmountForGroup + group.DistributedRemainder;
group.TotalForGroupAfterDiscountAndRemainder = group.TotalForGroupBeforeDiscount - group.DiscountAmountForGroupWithRemainder;
group.TotalVATAfterDiscount = Utils.GetSaleTaxDue(group.TotalForGroupAfterDiscountAndRemainder, group.TaxRate, TaxMethod);
group.TotalVATBeforeDiscount = Utils.GetSaleTaxDue(group.TotalForGroupBeforeDiscount, group.TaxRate, TaxMethod);
}
}
public CalculationStratagyResult Calculate(CommonTaxHelper commonTaxHelper)
{
RemainderHelper remainderHelper = new RemainderHelper();
Dictionary <string, TaxGroupForCalculations> taxGroupsForCalculations = createTaxGroupTable(commonTaxHelper.TransLines);
calcTaxForEachGroup(commonTaxHelper, remainderHelper, taxGroupsForCalculations);
distributeRemainders(POSITIVE_SIGN, commonTaxHelper, remainderHelper, taxGroupsForCalculations.Values);
distributeRemainders(NEGATIVE_SIGN, commonTaxHelper, remainderHelper, taxGroupsForCalculations.Values);
IEnumerable <TaxRateGroup> positiveTaxGroupedByTaxRate = getGroupedByTaxRate(taxGroupsForCalculations.Values.Where(x => x.PositiveOrNegative == POSITIVE_SIGN));
IEnumerable <TaxRateGroup> negativeTaxGroupedByTaxRate = getGroupedByTaxRate(taxGroupsForCalculations.Values.Where(x => x.PositiveOrNegative == NEGATIVE_SIGN));
IEnumerable <TaxCodeGroup> positiveTaxGroupedByTaxCode = getGroupedByTaxCode(taxGroupsForCalculations.Values.Where(x => x.PositiveOrNegative == POSITIVE_SIGN));
IEnumerable <TaxCodeGroup> negativeTaxGroupedByTaxCode = getGroupedByTaxCode(taxGroupsForCalculations.Values.Where(x => x.PositiveOrNegative == NEGATIVE_SIGN));
return(new CalculationStratagyResult(positiveTaxGroupedByTaxRate, negativeTaxGroupedByTaxRate, positiveTaxGroupedByTaxCode, negativeTaxGroupedByTaxCode));
}
private void calcTaxForEachGroup(CommonTaxHelper helper, RemainderHelper remainderHelper,
Dictionary <string, TaxGroupForCalculations> taxGroupsForCalculations)
{
foreach (var group in taxGroupsForCalculations.Values)
{
group.DiscountAmountForGroup = getDiscountAmount(helper, group.TotalForGroupBeforeDiscount);
group.TruncatedDiscountAmountForGroup = truncate(group.DiscountAmountForGroup);
group.TotalForGroupAfterDiscount = group.TotalForGroupBeforeDiscount - group.DiscountAmountForGroup;
group.TotalForGroupAfterDiscountRounded = Math.Round(group.TotalForGroupAfterDiscount, 2);
group.Remainder = group.DiscountAmountForGroup - group.TruncatedDiscountAmountForGroup;
if (group.TotalForGroupBeforeDiscount >= 0)
{
remainderHelper.RemainderSumPositive += group.Remainder;
}
else
{
remainderHelper.RemainderSumNegative += group.Remainder;
}
}
}