Hi guys

using uCommerce 3.6.0.13142 and the demo Razor Store 1.0.3.13124

I seem to be having a few issues with balancing order figures on the front end of the cart and preview pages with discounts; essentially I'm having difficulty in recreating the Sub Total and VAT figures pre discounts being applied. They're currently in this format:

Sub Total, Vat, Shipping, Discount, Total

Without discounts applied, I can easily access the above using the current client's basket / PurchaseOrder object, but with discounts applied, I have to start resorting to manually calculating the above because of how discounts affect the properties contained on the PurchaseOrder object. For example:

The SubTotal property is now discounted - there's no property which exposes the SubTotal before discounts are applied, so I have to work this out manually like so:

var subTotal = new Money(basket.OrderLines.Sum(p => p.Price * p.Quantity), currency);

I can't just take away the discounts from the SubTotal property, as this may includes discounts that apply to shipping.

The Vat is now discounted - there's no property which exposes the Vat before discounts are applied, so I have to work this out manually again, both to grab the VAT inclusive and exclusive of discounts.

var taxExDiscount = new Money(subTotal.Value * vatRate, currency);

var taxIncDiscount = new Money(basket.TaxTotal.Value, currency);

and finally to work out discounts (not including shipping discounts) I do the following:

if (basket.DiscountTotal.HasValue)
{
    var shippingDiscount = basket.Shipments.Sum(s => s.ShipmentDiscount ?? 0.00m);

    discountTotal = new Money((basket.DiscountTotal.Value - shippingDiscount) * -1, currency);
}

I'm having issues with this approach as well with the various types of discounts (order line and order).

I hope this makes sense; it just seems to be really workman-like and prone to error (being terrible at maths doesn't help!) - unless I'm completely missing something? Any help would be greatly appreciated!