public void AddCouponUsage(long customerId, long orderId, CouponValidationResult couponValidationResult)
{
if (!couponValidationResult.Succeeded || couponValidationResult.CartRule == null)
{
return;
}
CartRuleUsage couponUsage;
switch (couponValidationResult.CartRule.RuleToApply)
{
case "cart_fixed":
couponUsage = new CartRuleUsage
{
UserId = customerId,
OrderId = orderId,
CouponId = couponValidationResult.CouponId,
CartRuleId = couponValidationResult.CartRule.Id
};
_cartRuleUsageRepository.Add(couponUsage);
break;
case "by_percent":
foreach (var item in couponValidationResult.DiscountedProducts)
{
for (var i = 0; i < item.Quantity; i++)
{
couponUsage = new CartRuleUsage
{
UserId = customerId,
OrderId = orderId,
CouponId = couponValidationResult.CouponId,
CartRuleId = couponValidationResult.CartRule.Id
};
_cartRuleUsageRepository.Add(couponUsage);
}
}
break;
default:
throw new InvalidOperationException($"{couponValidationResult.CartRule.RuleToApply} is not supported");
}
}
public async Task <CouponValidationResult> Validate(long customerId, string couponCode, CartInfoForCoupon cart)
{
var coupon = await _couponRepository.Query()
.Include(x => x.CartRule).ThenInclude(c => c.Products)
.Include(x => x.CartRule).ThenInclude(c => c.Categories)
.FirstOrDefaultAsync(x => x.Code == couponCode);
var validationResult = new CouponValidationResult {
Succeeded = false
};
if (coupon == null || !coupon.CartRule.IsActive)
{
validationResult.ErrorMessage = $"The coupon {couponCode} is not exist.";
return(validationResult);
}
if (coupon.CartRule.StartOn.HasValue && coupon.CartRule.StartOn > DateTimeOffset.Now)
{
validationResult.ErrorMessage = $"The coupon {couponCode} should be used after {coupon.CartRule.StartOn}.";
return(validationResult);
}
if (coupon.CartRule.EndOn.HasValue && coupon.CartRule.EndOn <= DateTimeOffset.Now)
{
validationResult.ErrorMessage = $"The coupon {couponCode} is expired.";
return(validationResult);
}
var couponUsageCount = _cartRuleUsageRepository.Query().Count(x => x.CouponId == coupon.Id);
if (coupon.CartRule.UsageLimitPerCoupon.HasValue && couponUsageCount >= coupon.CartRule.UsageLimitPerCoupon)
{
validationResult.ErrorMessage = $"The coupon {couponCode} is all used.";
return(validationResult);
}
var couponUsageByCustomerCount = _cartRuleUsageRepository.Query().Count(x => x.CouponId == coupon.Id && x.UserId == customerId);
if (coupon.CartRule.UsageLimitPerCustomer.HasValue && couponUsageByCustomerCount >= coupon.CartRule.UsageLimitPerCustomer)
{
validationResult.ErrorMessage = $"You can use the coupon {couponCode} only {coupon.CartRule.UsageLimitPerCustomer} times";
return(validationResult);
}
IList <DiscountableProduct> discountableProducts = new List <DiscountableProduct>();
if (!coupon.CartRule.Products.Any() && !coupon.CartRule.Categories.Any())
{
var productIds = cart.Items.Select(x => x.ProductId);
discountableProducts = _productRepository.Query()
.Where(x => productIds.Contains(x.Id))
.Select(x => new DiscountableProduct {
Id = x.Id, Name = x.Name, Price = x.Price
}).ToList();
}
else
{
discountableProducts = GetDiscountableProduct(coupon.CartRule.Products, coupon.CartRule.Categories);
}
foreach (var item in cart.Items)
{
if ((coupon.CartRule.UsageLimitPerCoupon.HasValue && couponUsageCount >= coupon.CartRule.UsageLimitPerCoupon) ||
(coupon.CartRule.UsageLimitPerCustomer.HasValue && couponUsageByCustomerCount >= coupon.CartRule.UsageLimitPerCustomer))
{
break;
}
var discountableProduct = discountableProducts.FirstOrDefault(x => x.Id == item.ProductId);
if (discountableProduct != null)
{
var discountedProduct = new DiscountedProduct {
Id = discountableProduct.Id, Name = discountableProduct.Name, Price = discountableProduct.Price, Quantity = 1
};
couponUsageCount = couponUsageCount + 1;
couponUsageByCustomerCount = couponUsageByCustomerCount + 1;
for (var i = 1; i < item.Quantity; i++)
{
if ((coupon.CartRule.UsageLimitPerCoupon.HasValue && couponUsageCount >= coupon.CartRule.UsageLimitPerCoupon) ||
(coupon.CartRule.UsageLimitPerCustomer.HasValue && couponUsageByCustomerCount >= coupon.CartRule.UsageLimitPerCustomer))
{
break;
}
discountedProduct.Quantity = discountedProduct.Quantity + 1;
couponUsageCount = couponUsageCount + 1;
couponUsageByCustomerCount = couponUsageByCustomerCount + 1;
}
validationResult.DiscountedProducts.Add(discountedProduct);
}
}
if (!validationResult.DiscountedProducts.Any())
{
validationResult.ErrorMessage = $"The coupon {couponCode} doesn't apply to any products in your cart";
return(validationResult);
}
validationResult.Succeeded = true;
validationResult.CouponId = coupon.Id;
validationResult.CouponCode = coupon.Code;
validationResult.CouponRuleName = coupon.CartRule.Name;
validationResult.CartRule = coupon.CartRule;
switch (coupon.CartRule.RuleToApply)
{
case "cart_fixed":
validationResult.DiscountAmount = coupon.CartRule.DiscountAmount;
return(validationResult);
case "by_percent":
foreach (var item in validationResult.DiscountedProducts)
{
item.DiscountAmount = (item.Price * coupon.CartRule.DiscountAmount / 100) * item.Quantity;
}
validationResult.DiscountAmount = validationResult.DiscountedProducts.Sum(x => x.DiscountAmount);
return(validationResult);
default:
throw new InvalidOperationException($"{coupon.CartRule.RuleToApply} is not supported");
}
}