public ProductCustomViewModel(Product product)
        {
            ProductID       = product.ProductID;
            ProductName     = product.ProductName;
            SupplierID      = product.SupplierID;
            CategoryID      = product.CategoryID;
            QuantityPerUnit = product.QuantityPerUnit;
            UnitPrice       = product.UnitPrice;
            UnitsInStock    = product.UnitsInStock;
            UnitsOnOrder    = product.UnitsOnOrder;
            ReorderLevel    = product.ReorderLevel;
            Discontinued    = product.Discontinued;
            ProductType     = product.ProductType;
            if (ProductType != null)
            {
                switch (ProductType)
                {
                case "FoodAndBeverageItems":
                    FoodBevItemViewModel food = new FoodBevItemViewModel(product);
                    ProductDetail = food.fromItemToDict();
                    break;

                case "GarmentItems":
                    GarmentViewModel garment = new GarmentViewModel(product);
                    ProductDetail = garment.fromItemToDict();
                    break;

                case "MaterialItems":
                    MaterialViewModel materi = new MaterialViewModel(product);
                    ProductDetail = materi.fromItemToDict();
                    break;

                case "TransportationServices":
                    TransportationServicesViewModel trans = new TransportationServicesViewModel(product);
                    ProductDetail = trans.fromServToDict();
                    break;

                case "TelecommunicationServices":
                    TelecomunicationServiceViewModel telecomunication = new TelecomunicationServiceViewModel(product);
                    ProductDetail = telecomunication.fromServToDict();
                    break;

                default:
                    ProductDetail = null;
                    break;
                }
            }
            else
            {
                ProductDetail = null;
            }
        }
        public Product ConvertToProduct(string condition = null, int?userDemand = null, decimal?Duration = null)
        {
            decimal?         price     = null;
            var              prodDet   = "";
            ProductValidator validator = new ProductValidator();
            var              config    = new MapperConfiguration(cfg => { });
            var              mapper    = new Mapper(config);

            if (this.ProductType.Equals("FoodAndBeverageItems"))
            {
                FoodBevItemViewModel food = mapper.Map <FoodBevItemViewModel>(this.ProductDetail);
                prodDet = food.ConvertToItem();
                price   = food.unitPriceItemCalculation();
                validator.isValidProductDetail(prodDet, ProductType);
            }
            else if (this.ProductType.Equals("MaterialItems"))
            {
                MaterialViewModel materi = mapper.Map <MaterialViewModel>(this.ProductDetail);
                prodDet = materi.ConvertToItem();
                price   = materi.unitPriceItemCalculation();
                validator.isValidProductDetail(prodDet, ProductType);
            }
            else if (this.ProductType.Equals("GarmentItems"))
            {
                GarmentViewModel garment = mapper.Map <GarmentViewModel>(this.ProductDetail);
                prodDet = garment.ConvertToItem();
                price   = garment.unitPriceItemCalculation();
                validator.isValidProductDetail(prodDet, ProductType);
            }
            else if (this.ProductType.Equals("TransportationServices"))
            {
                TransportationServicesViewModel trans = mapper.Map <TransportationServicesViewModel>(this.ProductDetail);
                prodDet = trans.ConvertToServ();
                price   = trans.RateCostCalculation(condition, userDemand, Duration);
                validator.isValidProductDetail(prodDet, ProductType);
            }
            else if (this.ProductType.Equals("TelecommunicationServices"))
            {
                TelecomunicationServiceViewModel tele = mapper.Map <TelecomunicationServiceViewModel>(this.ProductDetail);
                prodDet = tele.ConvertToServ();
                price   = tele.RateCostCalculation(condition, userDemand, Duration);
                validator.isValidProductDetail(prodDet, ProductType);
            }
            else
            {
                price         = 0;
                ProductDetail = null;
            }

            if (validator.isValidProductDetail(prodDet, ProductType))
            {
                return(new Product()
                {
                    ProductID = this.ProductID,
                    ProductName = this.ProductName,
                    SupplierID = this.SupplierID,
                    CategoryID = this.CategoryID,
                    QuantityPerUnit = this.QuantityPerUnit,
                    UnitPrice = price,
                    UnitsInStock = this.UnitsInStock,
                    UnitsOnOrder = this.UnitsOnOrder,
                    ReorderLevel = this.ReorderLevel,
                    Discontinued = this.Discontinued,
                    ProductType = this.ProductType,
                    ProductDetail = prodDet
                });
            }
            else
            {
                return(null);
            }
        }