/// <summary>
        /// Check discount requirement
        /// </summary>
        /// <param name="request">Object that contains all information required to check the requirement (Current customer, discount, etc)</param>
        /// <returns>true - requirement is met; otherwise, false</returns>
        public bool CheckRequirement(CheckDiscountRequirementRequest request)
        {
            if (request == null)
                throw new ArgumentNullException("request");

            if (request.DiscountRequirement == null)
                throw new NopException("Discount requirement is not set");

            var spentAmountRequirement = _settingService.GetSettingByKey<decimal>(string.Format("DiscountRequirement.HadSpentAmount-{0}", request.DiscountRequirement.Id));

            if (spentAmountRequirement == decimal.Zero)
                return true;

            if (request.Customer == null || request.Customer.IsGuest())
                return false;
            //var orders = _orderService.SearchOrders(storeId: request.Store.Id,
            //    customerId: request.Customer.Id,
            //    os: OrderStatus.Complete);
            //decimal spentAmount = orders.Sum(o => o.OrderTotal);
            decimal spentAmount = 0;
            foreach (ShoppingCartItem item in request.Customer.ShoppingCartItems)
            {
                spentAmount = spentAmount + (item.Quantity * item.Product.Price);
            }
            return spentAmount > spentAmountRequirement;
            // return true;
        }
        /// <summary>
        /// Check discount requirement
        /// </summary>
        /// <param name="request">Object that contains all information required to check the requirement (Current customer, discount, etc)</param>
        /// <returns>true - requirement is met; otherwise, false</returns>
        public bool CheckRequirement(CheckDiscountRequirementRequest request)
        {
            if (request == null)
                throw new ArgumentNullException("request");

            if (request.DiscountRequirement == null)
                throw new NopException("Discount requirement is not set");

            if (String.IsNullOrWhiteSpace(request.DiscountRequirement.RestrictedProductVariantIds))
                return true;

            if (request.Customer == null)
                return false;

            var restrictedProductVariantIds = new List<int>();
            try
            {
                restrictedProductVariantIds = request.DiscountRequirement.RestrictedProductVariantIds
                    .Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries)
                    .Select(x => Convert.ToInt32(x))
                    .ToList();
            }
            catch
            {
                //error parsing
                return false;
            }
            if (restrictedProductVariantIds.Count == 0)
                return false;

            //purchased products
            var purchasedProductVariants = _orderService.GetAllOrderProductVariants(0,
                request.Customer.Id, null, null, OrderStatus.Complete, null, null);

            bool allFound = true;
            foreach (var restrictedPvId in restrictedProductVariantIds)
            {
                bool found1 = false;
                foreach (var purchasedPv in purchasedProductVariants)
                {
                    if (restrictedPvId == purchasedPv.ProductVariantId)
                    {
                        found1 = true;
                        break;
                    }
                }

                if (!found1)
                {
                    allFound = false;
                    break;
                }
            }

            if (allFound)
                return true;

            return false;
        }
        /// <summary>
        /// Check discount requirement
        /// </summary>
        /// <param name="request">Object that contains all information required to check the requirement (Current customer, discount, etc)</param>
        /// <returns>true - requirement is met; otherwise, false</returns>
        public bool CheckRequirement(CheckDiscountRequirementRequest request)
        {
            if (request == null)
                throw new ArgumentNullException("request");

            if (request.DiscountRequirement == null)
                throw new NopException("Discount requirement is not set");

            if (String.IsNullOrWhiteSpace(request.DiscountRequirement.RestrictedProductVariantIds))
                return true;

            if (request.Customer == null)
                return false;

            var restrictedProductVariantIds = new List<int>();
            try
            {
                restrictedProductVariantIds = request.DiscountRequirement.RestrictedProductVariantIds
                    .Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries)
                    .Select(x => Convert.ToInt32(x))
                    .ToList();
            }
            catch
            {
                //error parsing
                return false;
            }
            if (restrictedProductVariantIds.Count == 0)
                return false;

            //cart
            var cart = request.Customer.ShoppingCartItems.Where(x => x.ShoppingCartType == ShoppingCartType.ShoppingCart);

            bool allFound = true;
            foreach (var restrictedPvId in restrictedProductVariantIds)
            {
                bool found1 = false;
                foreach (var sci in cart)
                {
                    if (restrictedPvId == sci.ProductVariantId)
                    {
                        found1 = true;
                        break;
                    }
                }

                if (!found1)
                {
                    allFound = false;
                    break;
                }
            }

            if (allFound)
                return true;

            return false;
        }
        /// <summary>
        /// Check discount requirement
        /// </summary>
        /// <param name="request">Object that contains all information required to check the requirement (Current customer, discount, etc)</param>
        /// <returns>true - requirement is met; otherwise, false</returns>
        public bool CheckRequirement(CheckDiscountRequirementRequest request)
        {
            if (request == null)
                throw new ArgumentNullException("request");

            if (request.DiscountRequirement == null)
                throw new NopException("Discount requirement is not set");
            
            if (request.DiscountRequirement.SpentAmount == decimal.Zero)
                return true;

            if (request.Customer == null || request.Customer.IsGuest())
                return false;

            var orders = request.Customer.Orders.Where(o => !o.Deleted && o.OrderStatus == OrderStatus.Complete);
            decimal spentAmount = orders.Sum(o => o.OrderTotal);
            return spentAmount > request.DiscountRequirement.SpentAmount;
        }
        /// <summary>
        /// Check discount requirement
        /// </summary>
        /// <param name="request">Object that contains all information required to check the requirement (Current customer, discount, etc)</param>
        /// <returns>true - requirement is met; otherwise, false</returns>
        public bool CheckRequirement(CheckDiscountRequirementRequest request)
        {
            if (request == null)
                throw new ArgumentNullException("request");

            if (request.DiscountRequirement == null)
                throw new NopException("Discount requirement is not set");

            if (request.Customer == null)
                return false;

            var storeId = _settingService.GetSettingByKey<int>(string.Format("DiscountRequirement.Store-{0}", request.DiscountRequirement.Id));

            if (storeId == 0)
                return false;

            bool result = request.Store.Id == storeId;
            return result;
        }
        /// <summary>
        /// Check discount requirement
        /// </summary>
        /// <param name="request">Object that contains all information required to check the requirement (Current customer, discount, etc)</param>
        /// <returns>true - requirement is met; otherwise, false</returns>
        public bool CheckRequirement(CheckDiscountRequirementRequest request)
        {
            if (request == null)
                throw new ArgumentNullException("request");

            if (request.DiscountRequirement == null)
                throw new NopException("Discount requirement is not set");

            if (request.Customer == null)
                return false;

            if (!request.DiscountRequirement.RestrictedToCustomerRoleId.HasValue)
                return false;

            foreach (var customerRole in request.Customer.CustomerRoles.Where(cr => cr.Active).ToList())
                if (request.DiscountRequirement.RestrictedToCustomerRoleId == customerRole.Id)
                    return true;

            return false;
        }
        /// <summary>
        /// Check discount requirement
        /// </summary>
        /// <param name="request">Object that contains all information required to check the requirement (Current customer, discount, etc)</param>
        /// <returns>true - requirement is met; otherwise, false</returns>
        public bool CheckRequirement(CheckDiscountRequirementRequest request)
        {
            if (request == null)
                throw new ArgumentNullException("request");

            if (request.DiscountRequirement == null)
                throw new NopException("Discount requirement is not set");

            if (request.Customer == null)
                return false;

            if (request.Customer.ShippingAddress == null)
                return false;

            if (request.DiscountRequirement.ShippingCountryId == 0)
                return false;

            bool result = request.Customer.ShippingAddress.CountryId == request.DiscountRequirement.ShippingCountryId;
            return result;
        }
        /// <summary>
        /// Check discount requirement
        /// </summary>
        /// <param name="request">Object that contains all information required to check the requirement (Current customer, discount, etc)</param>
        /// <returns>true - requirement is met; otherwise, false</returns>
        public bool CheckRequirement(CheckDiscountRequirementRequest request)
        {
            if (request == null)
                throw new ArgumentNullException("request");

            if (request.DiscountRequirement == null)
                throw new NopException("Discount requirement is not set");

            var spentAmountRequirement = _settingService.GetSettingByKey<decimal>(string.Format("DiscountRequirement.HadSpentAmount-{0}", request.DiscountRequirement.Id));

            if (spentAmountRequirement == decimal.Zero)
                return true;

            if (request.Customer == null || request.Customer.IsGuest())
                return false;
            var orders = _orderService.SearchOrders(request.Store.Id, 0, request.Customer.Id,
                null, null, OrderStatus.Complete, null, null, null, null, 0, int.MaxValue);
            decimal spentAmount = orders.Sum(o => o.OrderTotal);
            return spentAmount > spentAmountRequirement;
        }
        /// <summary>
        /// Check discount requirement
        /// </summary>
        /// <param name="request">Object that contains all information required to check the requirement (Current customer, discount, etc)</param>
        /// <returns>true - requirement is met; otherwise, false</returns>
        public bool CheckRequirement(CheckDiscountRequirementRequest request)
        {
            if (request == null)
                throw new ArgumentNullException("request");

            if (request.DiscountRequirement == null)
                throw new NopException("Discount requirement is not set");

            if (request.Customer == null)
                return false;


            var restrictedToCustomerRoleId = _settingService.GetSettingByKey<int>(string.Format("DiscountRequirement.MustBeAssignedToCustomerRole-{0}", request.DiscountRequirement.Id));

            if (restrictedToCustomerRoleId == 0)
                return false;

            foreach (var customerRole in request.Customer.CustomerRoles.Where(cr => cr.Active).ToList())
                if (restrictedToCustomerRoleId == customerRole.Id)
                    return true;

            return false;
        }
        /// <summary>
        /// Check discount requirement
        /// </summary>
        /// <param name="request">Object that contains all information required to check the requirement (Current customer, discount, etc)</param>
        /// <returns>true - requirement is met; otherwise, false</returns>
        public bool CheckRequirement(CheckDiscountRequirementRequest request)
        {
            if (request == null)
                throw new ArgumentNullException("request");

            if (request.DiscountRequirement == null)
                throw new NopException("Discount requirement is not set");

           // var spentAmountRequirement = _settingService.GetSettingByKey<decimal>(string.Format("DiscountRequirement.FirstTimeUser-{0}", request.DiscountRequirement.Id));

            //if (spentAmountRequirement == decimal.Zero)
            //    return true;
            bool returnValue = true;
            if (request.Customer == null || request.Customer.IsGuest())
                return false;
            var orders = _orderService.SearchOrders(storeId:0, 
                customerId: request.Customer.Id, 
                os: null);
            foreach (Order orderItem in orders)
            {
                var address = _workContext.CurrentCustomer.Addresses.ToList().FindAddress(
                             orderItem.ShippingAddress.FirstName, orderItem.ShippingAddress.LastName, orderItem.ShippingAddress.PhoneNumber,
                    orderItem.ShippingAddress.Email, orderItem.ShippingAddress.FaxNumber, orderItem.ShippingAddress.Company,
                   orderItem.ShippingAddress.Address1, orderItem.ShippingAddress.Address2, orderItem.ShippingAddress.City,
                   orderItem.ShippingAddress.StateProvinceId, orderItem.ShippingAddress.ZipPostalCode,
                   orderItem.ShippingAddress.CountryId, null
                    );
                if (address != null)
                {
                    returnValue = false;
                    break;
                }
            }
            return returnValue;
            //decimal spentAmount = orders.Sum(o => o.OrderTotal);
            //return spentAmount > spentAmountRequirement;
        }
        /// <summary>
        /// Check discount requirements
        /// </summary>
        /// <param name="discount">Discount</param>
        /// <param name="customer">Customer</param>
        /// <param name="couponCodeToValidate">Coupon code to validate</param>
        /// <returns>true - requirement is met; otherwise, false</returns>
        public virtual bool IsDiscountValid(Discount discount, Customer customer, string couponCodeToValidate)
        {
            if (discount == null)
            {
                throw new ArgumentNullException("discount");
            }

            //check coupon code
            if (discount.RequiresCouponCode)
            {
                if (String.IsNullOrEmpty(discount.CouponCode))
                {
                    return(false);
                }
                if (!discount.CouponCode.Equals(couponCodeToValidate, StringComparison.InvariantCultureIgnoreCase))
                {
                    return(false);
                }
            }

            //check date range
            DateTime now = DateTime.UtcNow;

            if (discount.StartDateUtc.HasValue)
            {
                DateTime startDate = DateTime.SpecifyKind(discount.StartDateUtc.Value, DateTimeKind.Utc);
                if (startDate.CompareTo(now) > 0)
                {
                    return(false);
                }
            }
            if (discount.EndDateUtc.HasValue)
            {
                DateTime endDate = DateTime.SpecifyKind(discount.EndDateUtc.Value, DateTimeKind.Utc);
                if (endDate.CompareTo(now) < 0)
                {
                    return(false);
                }
            }

            if (!CheckDiscountLimitations(discount, customer))
            {
                return(false);
            }

            //discount requirements
            var requirements = discount.DiscountRequirements;

            foreach (var req in requirements)
            {
                var requirementRule = LoadDiscountRequirementRuleBySystemName(req.DiscountRequirementRuleSystemName);
                if (requirementRule == null)
                {
                    continue;
                }
                var request = new CheckDiscountRequirementRequest()
                {
                    DiscountRequirement = req,
                    Customer            = customer
                };
                if (!requirementRule.CheckRequirement(request))
                {
                    return(false);
                }
            }
            return(true);
        }
        /// <summary>
        /// Check discount requirement
        /// </summary>
        /// <param name="request">Object that contains all information required to check the requirement (Current customer, discount, etc)</param>
        /// <returns>true - requirement is met; otherwise, false</returns>
        public bool CheckRequirement(CheckDiscountRequirementRequest request)
        {
            if (request == null)
                throw new ArgumentNullException("request");

            if (request.DiscountRequirement == null)
                throw new NopException("Discount requirement is not set");

            var restrictedProductIds = _settingService.GetSettingByKey<string>(string.Format("DiscountRequirement.RestrictedProductIds-{0}", request.DiscountRequirement.Id));

            if (String.IsNullOrWhiteSpace(restrictedProductIds))
                return true;

            if (request.Customer == null)
                return false;

            //we support three ways of specifying products:
            //1. The comma-separated list of product identifiers (e.g. 77, 123, 156).
            //2. The comma-separated list of product identifiers with quantities.
            //      {Product ID}:{Quantity}. For example, 77:1, 123:2, 156:3
            //3. The comma-separated list of product identifiers with quantity range.
            //      {Product ID}:{Min quantity}-{Max quantity}. For example, 77:1-3, 123:2-5, 156:3-8
            var restrictedProducts = restrictedProductIds
                .Split(new[] {','}, StringSplitOptions.RemoveEmptyEntries)
                .Select(x => x.Trim())
                .ToList();
            if (restrictedProducts.Count == 0)
                return false;

            //group products in the cart by product ID
            //it could be the same product with distinct product attributes
            //that's why we get the total quantity of this product
            var cartQuery = from sci in request.Customer.ShoppingCartItems
                            where sci.ShoppingCartType == ShoppingCartType.ShoppingCart &&
                            sci.StoreId == request.Store.Id
                            group sci by sci.ProductId into g
                            select new { ProductId = g.Key, TotalQuantity = g.Sum(x => x.Quantity) };
            var cart = cartQuery.ToList();

            bool allFound = true;
            foreach (var restrictedProduct in restrictedProducts)
            {
                if (String.IsNullOrWhiteSpace(restrictedProduct))
                    continue;

                bool found1 = false;
                foreach (var sci in cart)
                {
                    if (restrictedProduct.Contains(":"))
                    {
                        if (restrictedProduct.Contains("-"))
                         {
                             //the third way (the quantity rage specified)
                             //{Product ID}:{Min quantity}-{Max quantity}. For example, 77:1-3, 123:2-5, 156:3-8
                             int restrictedProductId = 0;
                             if (!int.TryParse(restrictedProduct.Split(new[] { ':' })[0], out restrictedProductId))
                                 //parsing error; exit;
                                 return false;
                             int quantityMin = 0;
                             if (!int.TryParse(restrictedProduct.Split(new[] { ':' })[1].Split(new[] { '-' })[0], out quantityMin))
                                 //parsing error; exit;
                                 return false;
                             int quantityMax = 0;
                             if (!int.TryParse(restrictedProduct.Split(new[] { ':' })[1].Split(new[] { '-' })[1], out quantityMax))
                                 //parsing error; exit;
                                 return false;

                             if (sci.ProductId == restrictedProductId && quantityMin <= sci.TotalQuantity && sci.TotalQuantity <= quantityMax)
                             {
                                 found1 = true;
                                 break;
                             }
                         }
                         else
                         {
                             //the second way (the quantity specified)
                             //{Product ID}:{Quantity}. For example, 77:1, 123:2, 156:3
                             int restrictedProductId = 0;
                             if (!int.TryParse(restrictedProduct.Split(new[] { ':' })[0], out restrictedProductId))
                                 //parsing error; exit;
                                 return false;
                             int quantity = 0;
                             if (!int.TryParse(restrictedProduct.Split(new[] { ':' })[1], out quantity))
                                 //parsing error; exit;
                                 return false;

                             if (sci.ProductId == restrictedProductId && sci.TotalQuantity == quantity)
                             {
                                 found1 = true;
                                 break;
                             }
                         }
                    }
                    else
                    {
                        //the first way (the quantity is not specified)
                        int restrictedProductId = 0;
                        if (int.TryParse(restrictedProduct, out restrictedProductId))
                        {
                            if (sci.ProductId == restrictedProductId)
                            {
                                found1 = true;
                                break;
                            }
                        }
                    }
                }

                if (!found1)
                {
                    allFound = false;
                    break;
                }
            }

            if (allFound)
                return true;

            return false;
        }
        /// <summary>
        /// Check discount requirements
        /// </summary>
        /// <param name="discount">Discount</param>
        /// <param name="customer">Customer</param>
        /// <param name="couponCodeToValidate">Coupon code to validate</param>
        /// <returns>true - requirement is met; otherwise, false</returns>
        public virtual bool IsDiscountValid(Discount discount, Customer customer, string couponCodeToValidate)
        {
            if (discount == null)
                throw new ArgumentNullException("discount");

            //check coupon code
            if (discount.RequiresCouponCode)
            {
                if (String.IsNullOrEmpty(discount.CouponCode))
                    return false;
                if (!discount.CouponCode.Equals(couponCodeToValidate, StringComparison.InvariantCultureIgnoreCase))
                    return false;
            }

            //check date range
            DateTime now = DateTime.UtcNow;
            if (discount.StartDateUtc.HasValue)
            {
                DateTime startDate = DateTime.SpecifyKind(discount.StartDateUtc.Value, DateTimeKind.Utc);
                if (startDate.CompareTo(now) > 0)
                    return false;
            }
            if (discount.EndDateUtc.HasValue)
            {
                DateTime endDate = DateTime.SpecifyKind(discount.EndDateUtc.Value, DateTimeKind.Utc);
                if (endDate.CompareTo(now) < 0)
                    return false;
            }

            if (!CheckDiscountLimitations(discount, customer))
                return false;

            //discount requirements
            var requirements = discount.DiscountRequirements;
            foreach (var req in requirements)
            {
                var requirementRule = LoadDiscountRequirementRuleBySystemName(req.DiscountRequirementRuleSystemName);
                if (requirementRule == null)
                    continue;
                if (!_pluginFinder.AuthenticateStore(requirementRule.PluginDescriptor, _storeContext.CurrentStore.Id))
                    continue;

                var request = new CheckDiscountRequirementRequest()
                {
                    DiscountRequirement = req,
                    Customer = customer,
                    Store = _storeContext.CurrentStore
                };
                if (!requirementRule.CheckRequirement(request))
                    return false;
            }
            return true;
        }
 /// <summary>
 /// Check discount requirement
 /// </summary>
 /// <param name="request">Object that contains all information required to check the requirement (Current customer, discount, etc)</param>
 /// <returns>true - requirement is met; otherwise, false</returns>
 public bool CheckRequirement(CheckDiscountRequirementRequest request)
 {
     return true;
 }
        /// <summary>
        /// Check discount requirements
        /// </summary>
        /// <param name="discount">Discount</param>
        /// <param name="customer">Customer</param>
        /// <param name="couponCodeToValidate">Coupon code to validate</param>
        /// <returns>true - requirement is met; otherwise, false</returns>
        public virtual bool IsDiscountValid(Discount discount, Customer customer, string couponCodeToValidate)
        {
            if (discount == null)
            {
                throw new ArgumentNullException("discount");
            }

            //check coupon code
            if (discount.RequiresCouponCode)
            {
                if (String.IsNullOrEmpty(discount.CouponCode))
                {
                    return(false);
                }
                if (!discount.CouponCode.Equals(couponCodeToValidate, StringComparison.InvariantCultureIgnoreCase))
                {
                    return(false);
                }
            }

            //check date range
            DateTime now = DateTime.UtcNow;

            if (discount.StartDateUtc.HasValue)
            {
                DateTime startDate = DateTime.SpecifyKind(discount.StartDateUtc.Value, DateTimeKind.Utc);
                if (startDate.CompareTo(now) > 0)
                {
                    return(false);
                }
            }
            if (discount.EndDateUtc.HasValue)
            {
                DateTime endDate = DateTime.SpecifyKind(discount.EndDateUtc.Value, DateTimeKind.Utc);
                if (endDate.CompareTo(now) < 0)
                {
                    return(false);
                }
            }

            if (!CheckDiscountLimitations(discount, customer))
            {
                return(false);
            }

            //discount requirements
            var requirements = discount.DiscountRequirements;

            foreach (var req in requirements)
            {
                var requirementRule = LoadDiscountRequirementRuleBySystemName(req.DiscountRequirementRuleSystemName);
                if (requirementRule == null)
                {
                    continue;
                }
                if (!_pluginFinder.AuthenticateStore(requirementRule.PluginDescriptor, _storeContext.CurrentStore.Id))
                {
                    continue;
                }

                var request = new CheckDiscountRequirementRequest
                {
                    DiscountRequirement = req,
                    Customer            = customer,
                    Store = _storeContext.CurrentStore
                };
                if (!requirementRule.CheckRequirement(request))
                {
                    return(false);
                }
            }

            //Do not allow discounts applied to order subtotal or total when a customer has gift cards in the cart.
            //Otherwise, this customer can purchase gift cards with discount and get more than paid ("free money").
            if (discount.DiscountType == DiscountType.AssignedToOrderSubTotal ||
                discount.DiscountType == DiscountType.AssignedToOrderTotal)
            {
                var cart = customer.ShoppingCartItems
                           .Where(sci => sci.ShoppingCartType == ShoppingCartType.ShoppingCart)
                           .LimitPerStore(_storeContext.CurrentStore.Id)
                           .ToList();

                var hasGiftCards = cart.Any(x => x.Product.IsGiftCard);
                if (hasGiftCards)
                {
                    return(false);
                }
            }

            return(true);
        }
        /// <summary>
        /// Check discount requirement
        /// </summary>
        /// <param name="request">Object that contains all information required to check the requirement (Current customer, discount, etc)</param>
        /// <returns>true - requirement is met; otherwise, false</returns>
        public bool CheckRequirement(CheckDiscountRequirementRequest request)
        {
            if (request == null)
                throw new ArgumentNullException("request");

            if (request.DiscountRequirement == null)
                throw new NopException("Discount requirement is not set");

            if (String.IsNullOrWhiteSpace(request.DiscountRequirement.RestrictedProductVariantIds))
                return true;

            if (request.Customer == null)
                return false;

            //we support three ways of specifying product variants:
            //1. The comma-separated list of product variant identifiers (e.g. 77, 123, 156).
            //2. The comma-separated list of product variant identifiers with quantities.
            //      {Product variant ID}:{Quantity}. For example, 77:1, 123:2, 156:3
            //3. The comma-separated list of product variant identifiers with quantity range.
            //      {Product variant ID}:{Min quantity}-{Max quantity}. For example, 77:1-3, 123:2-5, 156:3-8
            var restrictedProductVariants = request.DiscountRequirement.RestrictedProductVariantIds
                .Split(new[] {','}, StringSplitOptions.RemoveEmptyEntries)
                .Select(x => x.Trim())
                .ToList();
            if (restrictedProductVariants.Count == 0)
                return false;

            //cart
            var cart = request.Customer.ShoppingCartItems.Where(x => x.ShoppingCartType == ShoppingCartType.ShoppingCart);
            
            bool allFound = true;
            foreach (var restrictedPv in restrictedProductVariants)
            {
                if (String.IsNullOrWhiteSpace(restrictedPv))
                    continue;

                bool found1 = false;
                foreach (var sci in cart)
                {
                    if (restrictedPv.Contains(":"))
                    {
                         if (restrictedPv.Contains("-"))
                         {
                             //the third way (the quantity rage specified)
                             //{Product variant ID}:{Min quantity}-{Max quantity}. For example, 77:1-3, 123:2-5, 156:3-8
                             int restrictedPvId = 0;
                             if (!int.TryParse(restrictedPv.Split(new[] { ':' })[0], out restrictedPvId))
                                 //parsing error; exit;
                                 return false;
                             int quantityMin = 0;
                             if (!int.TryParse(restrictedPv.Split(new[] { ':' })[1].Split(new[] { '-' })[0], out quantityMin))
                                 //parsing error; exit;
                                 return false;
                             int quantityMax = 0;
                             if (!int.TryParse(restrictedPv.Split(new[] { ':' })[1].Split(new[] { '-' })[1], out quantityMax))
                                 //parsing error; exit;
                                 return false;

                             if (sci.ProductVariantId == restrictedPvId && quantityMin <= sci.Quantity && sci.Quantity <=quantityMax)
                             {
                                 found1 = true;
                                 break;
                             }
                         }
                         else
                         {
                             //the second way (the quantity specified)
                             //{Product variant ID}:{Quantity}. For example, 77:1, 123:2, 156:3
                             int restrictedPvId = 0;
                             if (!int.TryParse(restrictedPv.Split(new[] { ':' })[0], out restrictedPvId))
                                 //parsing error; exit;
                                 return false;
                             int quantity = 0;
                             if (!int.TryParse(restrictedPv.Split(new[] { ':' })[1], out quantity))
                                 //parsing error; exit;
                                 return false;

                             if (sci.ProductVariantId == restrictedPvId && sci.Quantity == quantity)
                             {
                                 found1 = true;
                                 break;
                             }
                         }
                    }
                    else
                    {
                        //the first way (the quantity is not specified)
                        int restrictedPvId = int.Parse(restrictedPv);
                        if (sci.ProductVariantId == restrictedPvId)
                        {
                            found1 = true;
                            break;
                        }
                    }
                }

                if (!found1)
                {
                    allFound = false;
                    break;
                }
            }

            if (allFound)
                return true;

            return false;
        }
        /// <summary>
        /// Check discount requirements
        /// </summary>
        /// <param name="discount">Discount</param>
        /// <param name="customer">Customer</param>
        /// <param name="couponCodeToValidate">Coupon code to validate</param>
        /// <returns>true - requirement is met; otherwise, false</returns>
        public virtual bool IsDiscountValid(Discount discount, Customer customer, string couponCodeToValidate)
        {
            if (discount == null)
                throw new ArgumentNullException("discount");

            //check coupon code
            if (discount.RequiresCouponCode)
            {
                if (String.IsNullOrEmpty(discount.CouponCode))
                    return false;
                if (!discount.CouponCode.Equals(couponCodeToValidate, StringComparison.InvariantCultureIgnoreCase))
                    return false;
            }

            //check date range
            DateTime now = DateTime.UtcNow;
            if (discount.StartDateUtc.HasValue)
            {
                DateTime startDate = DateTime.SpecifyKind(discount.StartDateUtc.Value, DateTimeKind.Utc);
                if (startDate.CompareTo(now) > 0)
                    return false;
            }
            if (discount.EndDateUtc.HasValue)
            {
                DateTime endDate = DateTime.SpecifyKind(discount.EndDateUtc.Value, DateTimeKind.Utc);
                if (endDate.CompareTo(now) < 0)
                    return false;
            }

            if (!CheckDiscountLimitations(discount, customer))
                return false;

            //discount requirements
            var requirements = discount.DiscountRequirements;
            foreach (var req in requirements)
            {
                var requirementRule = LoadDiscountRequirementRuleBySystemName(req.DiscountRequirementRuleSystemName);
                if (requirementRule == null)
                    continue;
                if (!_pluginFinder.AuthenticateStore(requirementRule.PluginDescriptor, _storeContext.CurrentStore.Id))
                    continue;

                var request = new CheckDiscountRequirementRequest
                {
                    DiscountRequirement = req,
                    Customer = customer,
                    Store = _storeContext.CurrentStore
                };
                if (!requirementRule.CheckRequirement(request))
                    return false;
            }

            //Do not allow discounts applied to order subtotal or total when a customer has gift cards in the cart.
            //Otherwise, this customer can purchase gift cards with discount and get more than paid ("free money").
            if (discount.DiscountType == DiscountType.AssignedToOrderSubTotal ||
                discount.DiscountType == DiscountType.AssignedToOrderTotal)
            {
                var cart = customer.ShoppingCartItems
                    .Where(sci => sci.ShoppingCartType == ShoppingCartType.ShoppingCart)
                    .LimitPerStore(_storeContext.CurrentStore.Id)
                    .ToList();

                var hasGiftCards = cart.Any(x => x.Product.IsGiftCard);
                if (hasGiftCards)
                    return false;
            }

            return true;
        }