protected override Money CalculateSalesTax(IEnumerable <ILineItem> lineItems, IMarket market, IOrderAddress shippingAddress, Currency currency)
{
foreach (ILineItem lineItem in lineItems)
{
lineItem.TaxCategoryId = new int?(GetTaxCategoryId(lineItem));
}
decimal amount = new decimal();
foreach (IGrouping <int?, ILineItem> source in lineItems.GroupBy(x => x.TaxCategoryId, x => x))
{
IEnumerable <ITaxValue> taxValues = GetTaxValues(source.First(), market, shippingAddress);
foreach (ILineItem lineItem in source)
{
ILineItemCalculatedAmount calculatedAmount = lineItem as ILineItemCalculatedAmount;
if (calculatedAmount != null && calculatedAmount.IsSalesTaxUpToDate)
{
amount += calculatedAmount.SalesTax;
}
else
{
Money lineItemSalesTax = CalculateLineItemSalesTax(lineItem, market, GetExtendedPrice(lineItem, currency), taxValues);
ValidateSalesTax(lineItemSalesTax);
if (calculatedAmount != null)
{
calculatedAmount.SalesTax = lineItemSalesTax.Amount;
calculatedAmount.IsSalesTaxUpToDate = true;
}
amount += lineItemSalesTax.Amount;
}
}
}
return(new Money(amount, currency));
}
private Money CalculateLineItemSalesTax(
ILineItem lineItem,
IMarket market,
Money basePrice,
IEnumerable <ITaxValue> taxValues)
{
ILineItemCalculatedAmount calculatedAmount = lineItem as ILineItemCalculatedAmount;
bool flag = calculatedAmount != null ? calculatedAmount.PricesIncludeTax : market.PricesIncludeTax;
decimal num = (decimal)taxValues.Where(x => x.TaxType == TaxType.SalesTax).Sum(x => x.Percentage);
var amount = basePrice.Amount * num / (flag ? num + new decimal(100) : new decimal(100));
return(new Money(Math.Round(amount, 2, MidpointRounding.AwayFromZero), basePrice.Currency));
}
protected override Money CalculateShippingTax(ILineItem lineItem, IMarket market, IOrderAddress shippingAddress, Money basePrice)
{
IEnumerable <ITaxValue> taxValues = GetTaxValues(lineItem, market, shippingAddress);
if (!taxValues.Any())
{
return(new Money(decimal.Zero, basePrice.Currency));
}
ILineItemCalculatedAmount calculatedAmount = lineItem as ILineItemCalculatedAmount;
bool flag = calculatedAmount != null ? calculatedAmount.PricesIncludeTax : market != null && market.PricesIncludeTax;
decimal num = (decimal)taxValues.Where(x => x.TaxType == TaxType.ShippingTax).Sum(x => x.Percentage);
var amount = basePrice.Amount * num / (flag ? num + new decimal(100) : new decimal(100));
return(new Money(Math.Round(amount, 2, MidpointRounding.AwayFromZero), basePrice.Currency));
}
