public Product(IProductVariant variantTemplate, OptionCollection optionCollection)
        {
            Mandate.ParameterNotNull(variantTemplate, "groupTemplate");
            Mandate.ParameterNotNull(optionCollection, "optionCollection");

            _variantTemplate = variantTemplate;
            _optionCollection = optionCollection;
        }

        public Product(IProductVariant variant, ProductOptionCollection productOptions, ProductVariantCollection productVariants)
        {
            Mandate.ParameterNotNull(variant, "variantMaster");
            Mandate.ParameterNotNull(productOptions, "optionCollection");
            Mandate.ParameterNotNull(productVariants, "productVariants");

            _variant = variant;
            _productOptions = productOptions;
            _productVariants = productVariants;
        }

        /// <summary>
        /// Adds the variants to the catalog.
        /// </summary>
        /// <param name="variant">
        /// The variant.
        /// </param>
        private void AddToCatalog(IProductVariant variant)
        {
            var matching = this.GetOrignalMatchingVariant(variant);
            var catalogKeys = matching.CatalogInventories.Select(x => x.CatalogKey).ToArray();

            foreach (var key in catalogKeys)
            {
                if (variant.CatalogInventories.All(x => x.CatalogKey != key))
                {
                    var catalog = _warehouseCatalogs.Value.FirstOrDefault(x => x.Key == key);
                    if (catalog != null) variant.AddToCatalogInventory(catalog);   
                }
            }
        }

 private static void IndexProductVariant(IProductVariant productVariant)
 {
     IndexProductVariant(productVariant, null);
 }

        /// <summary>
        /// Saves a single instance of a <see cref="IProductVariant"/>
        /// </summary>
        /// <param name="productVariant"></param>
        /// <param name="raiseEvents">Optional boolean indicating whether or not to raise events</param>
        public void Save(IProductVariant productVariant, bool raiseEvents = true)
        {
            if(raiseEvents)
            if (Saving.IsRaisedEventCancelled(new SaveEventArgs<IProductVariant>(productVariant), this))
            {
                ((ProductVariant)productVariant).WasCancelled = true;
                return;
            }

            using (new WriteLock(Locker))
            {
                var uow = _uowProvider.GetUnitOfWork();
                using (var repository = _repositoryFactory.CreateProductVariantRepository(uow))
                {
                    repository.AddOrUpdate(productVariant);
                    uow.Commit();
                }
            }

            if (raiseEvents)
            Saved.RaiseEvent(new SaveEventArgs<IProductVariant>(productVariant), this);
        }

 /// <summary>
 /// Updates a wish list item's quantity
 /// </summary>
 /// <param name="productVariant">
 /// The product Variant.
 /// </param>
 /// <param name="quantity">
 /// The quantity.
 /// </param>
 public void UpdateQuantity(IProductVariant productVariant, int quantity)
 {
     UpdateQuantity(productVariant.Sku, quantity);
 }

        /// <summary>
        /// Adds a line item to the wish list
        /// </summary>
        /// <param name="productVariant">
        /// The product Variant.
        /// </param>
        /// <param name="name">
        /// The name.
        /// </param>
        /// <param name="quantity">
        /// The quantity.
        /// </param>
        /// <param name="extendedData">
        /// The extended Data.
        /// </param>
        public void AddItem(IProductVariant productVariant, string name, int quantity, ExtendedDataCollection extendedData)
        {
            if (!extendedData.DefinesProductVariant()) extendedData.AddProductVariantValues(productVariant);

            var onSale = productVariant.OnSale ? extendedData.GetSalePriceValue() : extendedData.GetPriceValue();

            AddItem(string.IsNullOrEmpty(name) ? productVariant.Name : name, productVariant.Sku, quantity, onSale, extendedData);
        }

 /// <summary>
 /// Adds a line item to the customer item cache
 /// </summary>
 /// <param name="productVariant">
 /// The product Variant.
 /// </param>
 /// <param name="name">
 /// The name.
 /// </param>
 /// <param name="quantity">
 /// The quantity.
 /// </param>
 /// <param name="extendedData">
 /// The extended Data.
 /// </param>
 public void AddItem(IProductVariant productVariant, string name, int quantity, ExtendedDataCollection extendedData)
 {
     AddItem(productVariant.ToProductVariantDisplay(), name, quantity, extendedData);
 }

        /// <summary>
        /// Adds a line item to the basket
        /// </summary>
        public void AddItem(IProductVariant productVariant, string name, int quantity, ExtendedDataCollection extendedData)
        {
            if(!extendedData.DefinesProductVariant()) extendedData.AddProductVariantValues(productVariant);

            AddItem(
                string.IsNullOrEmpty(name) ? productVariant.Name : name,
                productVariant.Sku,
                quantity,
                productVariant.OnSale ?
                extendedData.GetSalePriceValue()
                : extendedData.GetPriceValue(), extendedData); // get the price information from extended data in case it has been overriden

            //productVariant.SalePrice.Value : productVariant.Price
        }

        private static string GetCatalogInventoriesJson(IProductVariant productVariant)
        {
            var json = "[{0}]";
            var catalogInventories = "";

            foreach (var ch in productVariant.CatalogInventories)
            {
                if (catalogInventories.Length > 0) catalogInventories += ",";
                catalogInventories += JsonConvert.SerializeObject(
                new
                {   catalogKey = ch.CatalogKey,
                    productVariantKey = ch.ProductVariantKey,
                    location = ch.Location,
                    count = ch.Count,
                    lowCount = ch.LowCount
                },
                Formatting.None);
            }
            json = string.Format(json, catalogInventories);
            return json;
        }

        private static string GetAttributesJson(IProductVariant productVariant)
        {
            var json = "[{0}]";
            var atts = "";

            foreach (var attribute in productVariant.Attributes)
            {
                if (atts.Length > 0) atts += ",";
                atts += JsonConvert.SerializeObject(
                new
                {
                    key = attribute.Key,
                    optionKey = attribute.OptionKey,
                    name = attribute.Name,
                    sku = attribute.Sku,
                    sortOrder = attribute.SortOrder
                },
                Formatting.None);
            }
            json = string.Format(json, atts);
            return json;
        }

        /// <summary>
        /// Deletes a single <see cref="IProductVariant"/>
        /// </summary>
        /// <param name="productVariant">The <see cref="IProductVariant"/> to be deleted</param>
        /// <param name="raiseEvents">Optional boolean indicating whether or not to raise events</param>
        public void Delete(IProductVariant productVariant, bool raiseEvents = true)
        {
            if (raiseEvents)
            {
                if (Deleting.IsRaisedEventCancelled(new DeleteEventArgs<IProductVariant>(productVariant), this))
                {
                    ((ProductVariant)productVariant).WasCancelled = true;
                    return;
                }
            }

            using (new WriteLock(Locker))
            {
                var uow = UowProvider.GetUnitOfWork();
                using (var repository = RepositoryFactory.CreateProductVariantRepository(uow))
                {
                    repository.Delete(productVariant);
                    uow.Commit();
                }
            }
            if (raiseEvents) Deleted.RaiseEvent(new DeleteEventArgs<IProductVariant>(productVariant), this);
        }

		/// <summary>
		/// Gets the product variant.
		/// </summary>
		/// <param name="variant">The variant.</param>
		/// <param name="storeAlias">The store alias.</param>
		/// <param name="currencyCode">The currency code.</param>
		/// <returns></returns>
		/// <exception cref="System.ArgumentNullException">variant</exception>
		public static IProductVariant GetProductVariant(IProductVariant variant, string storeAlias = null, string currencyCode = null)
		{
			if (variant == null) throw new ArgumentNullException("variant");
			return GetProductVariant(variant.Id, storeAlias, currencyCode);
		}

        internal static IProductVariant ToProductVariant(this ProductVariantDisplay productVariantDisplay, IProductVariant destination)
        {
            if (productVariantDisplay.Key != Guid.Empty)
            {
                destination.Key = productVariantDisplay.Key;
            }
            if( !String.IsNullOrEmpty(productVariantDisplay.Name) )
            {
                destination.Name = productVariantDisplay.Name;
            }
            if( !String.IsNullOrEmpty(productVariantDisplay.Sku) )
            {
                destination.Sku = productVariantDisplay.Sku;
            }
            destination.Price = productVariantDisplay.Price;
            destination.CostOfGoods = productVariantDisplay.CostOfGoods;
            destination.SalePrice = productVariantDisplay.SalePrice;
            destination.OnSale = productVariantDisplay.OnSale;
            destination.Manufacturer = productVariantDisplay.Manufacturer;
            destination.ManufacturerModelNumber = productVariantDisplay.ManufacturerModelNumber;
            destination.Weight = productVariantDisplay.Weight;
            destination.Length = productVariantDisplay.Length;
            destination.Width = productVariantDisplay.Width;
            destination.Height = productVariantDisplay.Height;
            destination.Barcode = productVariantDisplay.Barcode;
            destination.Available = productVariantDisplay.Available;
            destination.TrackInventory = productVariantDisplay.TrackInventory;
            destination.OutOfStockPurchase = productVariantDisplay.OutOfStockPurchase;
            destination.Taxable = productVariantDisplay.Taxable;
            destination.Shippable = productVariantDisplay.Shippable;
            destination.Download = productVariantDisplay.Download;
            destination.DownloadMediaId = productVariantDisplay.DownloadMediaId;

            destination.ProductKey = productVariantDisplay.ProductKey;

            // We need to refactor the CatalogInventories to not be immutable if we are
            // going to need to do operations like this.  In the UI, the user "unchecks" a catalog that was
            // previously checked - so we need to remove it.
            var deletedCatalogKeys =
                destination.CatalogInventories.Where(
                    x => !productVariantDisplay.CatalogInventories.Select(ci => ci.CatalogKey).Contains(x.CatalogKey)).Select(x => x.CatalogKey).ToArray();
            foreach (var deletedCatalogKey in deletedCatalogKeys)
            {
                destination.RemoveFromCatalogInventory(deletedCatalogKey);
            }

            foreach (var catalogInventory in productVariantDisplay.CatalogInventories)
            {
                var catInv = destination.CatalogInventories.FirstOrDefault(x => x.CatalogKey == catalogInventory.CatalogKey);

                if (catInv != null)
                {
                    var destinationCatalogInventory = catInv;

                    destinationCatalogInventory = catalogInventory.ToCatalogInventory(destinationCatalogInventory);
                }
                else if (!Guid.Empty.Equals(catalogInventory.CatalogKey) && destination.HasIdentity)
                {
                    //// Add to a new catalog
                    destination.AddToCatalogInventory(catalogInventory.CatalogKey);
                }
            }

            foreach (var attribute in productVariantDisplay.Attributes)
            {
                IProductAttribute destinationProductAttribute;

                var attr = destination.Attributes.FirstOrDefault(x => x.Key == attribute.Key);
                if (attr != null)
                {
                    destinationProductAttribute = attr;

                    destinationProductAttribute = attribute.ToProductAttribute(destinationProductAttribute);
                }
                else
                {
                    destinationProductAttribute = new ProductAttribute(attribute.Name, attribute.Sku);

                    destinationProductAttribute = attribute.ToProductAttribute(destinationProductAttribute);

                    ProductAttributeCollection variantAttributes = destination.Attributes as ProductAttributeCollection;
                    variantAttributes.Add(destinationProductAttribute);
                }
            }

            destination.AddOrUpdateDetachedContent(productVariantDisplay);

            return destination;
        }

 private static void IndexProductVariant(IProductVariant productVariant)
 {
     ProductIndexer.ReIndexNode(productVariant.SerializeToXml().Root, IndexTypes.ProductVariant);
 }

 private static void DeleteProductVariantFromIndex(IProductVariant productVariant)
 {
     ProductIndexer.DeleteFromIndex(((ProductVariant)productVariant).ExamineId.ToString(CultureInfo.InvariantCulture));
 }

        internal static IProductVariant ToProductVariant(this ProductVariantDisplay productVariantDisplay, IProductVariant destination)
        {
            if (productVariantDisplay.Key != Guid.Empty)
            {
                destination.Key = productVariantDisplay.Key;
            }
            if( !String.IsNullOrEmpty(productVariantDisplay.Name) )
            {
                destination.Name = productVariantDisplay.Name;
            }
            if( !String.IsNullOrEmpty(productVariantDisplay.Sku) )
            {
                destination.Sku = productVariantDisplay.Sku;
            }
            destination.Price = productVariantDisplay.Price;
            destination.CostOfGoods = productVariantDisplay.CostOfGoods;
            destination.SalePrice = productVariantDisplay.SalePrice;
            destination.OnSale = productVariantDisplay.OnSale;
            destination.Manufacturer = productVariantDisplay.Manufacturer;
            destination.ManufacturerModelNumber = productVariantDisplay.ManufacturerModelNumber;
            destination.Weight = productVariantDisplay.Weight;
            destination.Length = productVariantDisplay.Length;
            destination.Width = productVariantDisplay.Width;
            destination.Height = productVariantDisplay.Height;
            destination.Barcode = productVariantDisplay.Barcode;
            destination.Available = productVariantDisplay.Available;
            destination.TrackInventory = productVariantDisplay.TrackInventory;
            destination.OutOfStockPurchase = productVariantDisplay.OutOfStockPurchase;
            destination.Taxable = productVariantDisplay.Taxable;
            destination.Shippable = productVariantDisplay.Shippable;
            destination.Download = productVariantDisplay.Download;
            destination.DownloadMediaId = productVariantDisplay.DownloadMediaId;

            destination.ProductKey = productVariantDisplay.ProductKey;

            foreach (var catalogInventory in productVariantDisplay.CatalogInventories)
            {
				var catInv = destination.CatalogInventories.FirstOrDefault(x => x.CatalogKey == catalogInventory.CatalogKey);
				
				if (catInv != null)
				{
					var destinationCatalogInventory = catInv;
				
					destinationCatalogInventory = catalogInventory.ToCatalogInventory(destinationCatalogInventory);
				}
				else if (!Guid.Empty.Equals(catalogInventory.CatalogKey) && destination.HasIdentity)
				{
					//// Add to a new catalog
					destination.AddToCatalogInventory(catalogInventory.CatalogKey);
				}
            }

            foreach (var attribute in productVariantDisplay.Attributes)
            {
                IProductAttribute destinationProductAttribute;

                var attr = destination.Attributes.First(x => x.Key == attribute.Key);
                if (attr != null)
                {
                    destinationProductAttribute = attr;

                    destinationProductAttribute = attribute.ToProductAttribute(destinationProductAttribute);
                }
                else
                {
                    destinationProductAttribute = new ProductAttribute(attribute.Name, attribute.Sku);

                    destinationProductAttribute = attribute.ToProductAttribute(destinationProductAttribute);

                    ProductAttributeCollection variantAttributes = destination.Attributes as ProductAttributeCollection;
                    variantAttributes.Add(destinationProductAttribute);
                }
            }

            return destination;
        }

 /// <summary>
 /// Removes a wish list line item
 /// </summary>
 /// <param name="productVariant">
 /// The product Variant.
 /// </param>
 public void RemoveItem(IProductVariant productVariant)
 {
     RemoveItem(productVariant.Sku);
 }

		/// <summary>
		/// Gets the discount for product variant.
		/// </summary>
		/// <param name="variant">The variant.</param>
		/// <param name="storeAlias">The store alias.</param>
		/// <param name="currencyCode">The currency code.</param>
		/// <returns></returns>
		/// <exception cref="System.ArgumentNullException">variant</exception>
		public static IEnumerable<IProductDiscount> GetDiscountForProductVariant(IProductVariant variant, string storeAlias = null, string currencyCode = null)
		{
			if (variant == null) throw new ArgumentNullException("variant");
			return GetDiscountForProduct(variant.Id, storeAlias, currencyCode);
		}

        private IProductVariant GetOrignalMatchingVariant(IProductVariant cloneVariant)
        {
            var skus = cloneVariant.Attributes.Select(x => x.Sku).ToArray();

            return _original.ProductVariants.FirstOrDefault(x => x.Attributes.All(y => skus.Contains(y.Sku)));
        }