public bool Applies(ShoppingCartQuantityProduct quantityProduct, IEnumerable<ShoppingCartQuantityProduct> cartProducts) {
if (DiscountPart == null) return false;
var now = _clock.UtcNow;
if (DiscountPart.StartDate != null && DiscountPart.StartDate > now) return false;
if (DiscountPart.EndDate != null && DiscountPart.EndDate < now) return false;
if (DiscountPart.StartQuantity != null &&
DiscountPart.StartQuantity > quantityProduct.Quantity)
return false;
if (DiscountPart.EndQuantity != null &&
DiscountPart.EndQuantity < quantityProduct.Quantity)
return false;
if (!string.IsNullOrWhiteSpace(DiscountPart.Pattern)) {
string path;
if (DiscountPart.DisplayUrlResolver != null) {
path = DiscountPart.DisplayUrlResolver(quantityProduct.Product);
}
else {
var urlHelper = new UrlHelper(_wca.GetContext().HttpContext.Request.RequestContext);
path = urlHelper.ItemDisplayUrl(quantityProduct.Product);
}
if (!path.StartsWith(DiscountPart.Pattern, StringComparison.OrdinalIgnoreCase))
return false;
}
if (DiscountPart.Roles.Any()) {
var user = _wca.GetContext().CurrentUser;
if (user.Has<UserRolesPart>()) {
var roles = user.As<UserRolesPart>().Roles;
if (!roles.Any(r => DiscountPart.Roles.Contains(r))) return false;
}
}
return true;
}
public IEnumerable<ShoppingCartQuantityProduct> GetModifiedPrices(
ShoppingCartQuantityProduct quantityProduct,
IEnumerable<ShoppingCartQuantityProduct> cartProducts) {
var discounts = GetPromotions().Cast<Discount>();
var cartProductList = cartProducts == null ? null : cartProducts.ToList();
foreach (var discount in discounts) {
discount.DiscountPart.DisplayUrlResolver = DisplayUrlResolver;
// Does the discount apply?
if (!discount.Applies(quantityProduct, cartProductList)) continue;
// Discount applies
yield return discount.Apply(quantityProduct, cartProductList);
}
}
public ShoppingCartQuantityProduct GetDiscountedPrice(
ShoppingCartQuantityProduct productQuantity,
IEnumerable<ShoppingCartQuantityProduct> shoppingCartQuantities = null) {
var modifiedPrices = _priceProviders
.SelectMany(pp => pp.GetModifiedPrices(productQuantity, shoppingCartQuantities))
.ToList();
if (!modifiedPrices.Any()) return productQuantity;
var result = new ShoppingCartQuantityProduct(productQuantity.Quantity, productQuantity.Product);
var minPrice = modifiedPrices.Min(mp => mp.Price);
result.Price = minPrice;
var lowestPrice = modifiedPrices.FirstOrDefault(mp => Math.Abs(mp.Price - minPrice) < Epsilon);
if (lowestPrice != null) {
result.Comment = lowestPrice.Comment;
}
return result;
}
public ShoppingCartQuantityProduct Apply(ShoppingCartQuantityProduct quantityProduct, IEnumerable<ShoppingCartQuantityProduct> cartProducts) {
if (DiscountPart == null) return quantityProduct;
var comment = DiscountPart.Comment; // TODO: tokenize this
var percent = DiscountPart.DiscountPercent;
if (percent != null) {
return new ShoppingCartQuantityProduct(quantityProduct.Quantity, quantityProduct.Product) {
Comment = comment,
Price = Math.Round(quantityProduct.Price * (1 - ((double)percent / 100)), 2)
};
}
var discount = DiscountPart.Discount;
if (discount != null) {
return new ShoppingCartQuantityProduct(quantityProduct.Quantity, quantityProduct.Product) {
Comment = comment,
Price = Math.Round(Math.Max(0, quantityProduct.Price - (double)discount), 2)
};
}
return quantityProduct;
}