/// <summary>
/// Gets tax total
/// </summary>
/// <param name="taxTotalRequest">Tax total request</param>
/// <returns>Tax total</returns>
public async Task <TaxTotalResult> GetTaxTotalAsync(TaxTotalRequest taxTotalRequest)
{
if (!(_httpContextAccessor.HttpContext.Items.TryGetValue("nop.TaxTotal", out var result) && result is TaxTotalResult taxTotalResult))
{
var taxRates = new SortedDictionary <decimal, decimal>();
//order sub total (items + checkout attributes)
var(_, _, _, _, orderSubTotalTaxRates) = await _orderTotalCalculationService
.GetShoppingCartSubTotalAsync(taxTotalRequest.ShoppingCart, false);
var subTotalTaxTotal = decimal.Zero;
foreach (var kvp in orderSubTotalTaxRates)
{
var taxRate = kvp.Key;
var taxValue = kvp.Value;
subTotalTaxTotal += taxValue;
if (taxRate > decimal.Zero && taxValue > decimal.Zero)
{
if (!taxRates.ContainsKey(taxRate))
{
taxRates.Add(taxRate, taxValue);
}
else
{
taxRates[taxRate] = taxRates[taxRate] + taxValue;
}
}
}
//shipping
var shippingTax = decimal.Zero;
if (_taxSettings.ShippingIsTaxable)
{
var(shippingExclTax, _, _) = await _orderTotalCalculationService
.GetShoppingCartShippingTotalAsync(taxTotalRequest.ShoppingCart, false);
var(shippingInclTax, taxRate, _) = await _orderTotalCalculationService
.GetShoppingCartShippingTotalAsync(taxTotalRequest.ShoppingCart, true);
if (shippingExclTax.HasValue && shippingInclTax.HasValue)
{
shippingTax = shippingInclTax.Value - shippingExclTax.Value;
if (shippingTax < decimal.Zero)
{
shippingTax = decimal.Zero;
}
if (taxRate > decimal.Zero && shippingTax > decimal.Zero)
{
if (!taxRates.ContainsKey(taxRate))
{
taxRates.Add(taxRate, shippingTax);
}
else
{
taxRates[taxRate] = taxRates[taxRate] + shippingTax;
}
}
}
}
//add at least one tax rate (0%)
if (!taxRates.Any())
{
taxRates.Add(decimal.Zero, decimal.Zero);
}
var taxTotal = subTotalTaxTotal + shippingTax;
if (taxTotal < decimal.Zero)
{
taxTotal = decimal.Zero;
}
taxTotalResult = new TaxTotalResult {
TaxTotal = taxTotal, TaxRates = taxRates
};
_httpContextAccessor.HttpContext.Items.TryAdd("nop.TaxTotal", taxTotalResult);
}
//payment method additional fee
if (taxTotalRequest.UsePaymentMethodAdditionalFee && _taxSettings.PaymentMethodAdditionalFeeIsTaxable)
{
var paymentMethodSystemName = taxTotalRequest.Customer != null
? await _genericAttributeService.GetAttributeAsync <string>(taxTotalRequest.Customer,
NopCustomerDefaults.SelectedPaymentMethodAttribute, taxTotalRequest.StoreId)
: string.Empty;
var paymentMethodAdditionalFee = await _paymentService.GetAdditionalHandlingFeeAsync(taxTotalRequest.ShoppingCart, paymentMethodSystemName);
var(paymentMethodAdditionalFeeExclTax, _) = await _taxService
.GetPaymentMethodAdditionalFeeAsync(paymentMethodAdditionalFee, false, taxTotalRequest.Customer);
var(paymentMethodAdditionalFeeInclTax, taxRate) = await _taxService
.GetPaymentMethodAdditionalFeeAsync(paymentMethodAdditionalFee, true, taxTotalRequest.Customer);
var paymentMethodAdditionalFeeTax = paymentMethodAdditionalFeeInclTax - paymentMethodAdditionalFeeExclTax;
if (paymentMethodAdditionalFeeTax < decimal.Zero)
{
paymentMethodAdditionalFeeTax = decimal.Zero;
}
taxTotalResult.TaxTotal += paymentMethodAdditionalFeeTax;
if (taxRate > decimal.Zero && paymentMethodAdditionalFeeTax > decimal.Zero)
{
if (!taxTotalResult.TaxRates.ContainsKey(taxRate))
{
taxTotalResult.TaxRates.Add(taxRate, paymentMethodAdditionalFeeTax);
}
else
{
taxTotalResult.TaxRates[taxRate] = taxTotalResult.TaxRates[taxRate] + paymentMethodAdditionalFeeTax;
}
}
}
return(taxTotalResult);
}
