Refactoring Services (#61)

* Refactoring ViewModels into Razor Pages models

* Cleaning up Basket viewcomponent

* Refactoring services.
Fixed bug in basket item counter.

src/WebRazorPages/Services/BasketViewModelService.cs

@@ -0,0 +1,76 @@
+using ApplicationCore.Interfaces;
+using System.Threading.Tasks;
+using Microsoft.eShopWeb.ApplicationCore.Entities;
+using System.Linq;
+using System.Collections.Generic;
+using ApplicationCore.Specifications;
+using Microsoft.eShopWeb.RazorPages.Interfaces;
+using Microsoft.eShopWeb.RazorPages.ViewModels;
+
+namespace Microsoft.eShopWeb.RazorPages.Services
+{
+    public class BasketViewModelService : IBasketViewModelService
+    {
+        private readonly IAsyncRepository<Basket> _basketRepository;
+        private readonly IUriComposer _uriComposer;
+        private readonly IRepository<CatalogItem> _itemRepository;
+
+        public BasketViewModelService(IAsyncRepository<Basket> basketRepository,
+            IRepository<CatalogItem> itemRepository,
+            IUriComposer uriComposer)
+        {
+            _basketRepository = basketRepository;
+            _uriComposer = uriComposer;
+            _itemRepository = itemRepository;
+        }
+
+        public async Task<BasketViewModel> GetOrCreateBasketForUser(string userName)
+        {
+            var basketSpec = new BasketWithItemsSpecification(userName);
+            var basket = (await _basketRepository.ListAsync(basketSpec)).FirstOrDefault();
+
+            if (basket == null)
+            {
+                return await CreateBasketForUser(userName);
+            }
+            return CreateViewModelFromBasket(basket);
+        }
+
+        private BasketViewModel CreateViewModelFromBasket(Basket basket)
+        {
+            var viewModel = new BasketViewModel();
+            viewModel.Id = basket.Id;
+            viewModel.BuyerId = basket.BuyerId;
+            viewModel.Items = basket.Items.Select(i =>
+            {
+                var itemModel = new BasketItemViewModel()
+                {
+                    Id = i.Id,
+                    UnitPrice = i.UnitPrice,
+                    Quantity = i.Quantity,
+                    CatalogItemId = i.CatalogItemId
+
+                };
+                var item = _itemRepository.GetById(i.CatalogItemId);
+                itemModel.PictureUrl = _uriComposer.ComposePicUri(item.PictureUri);
+                itemModel.ProductName = item.Name;
+                return itemModel;
+            })
+                            .ToList();
+            return viewModel;
+        }
+
+        private async Task<BasketViewModel> CreateBasketForUser(string userId)
+        {
+            var basket = new Basket() { BuyerId = userId };
+            await _basketRepository.AddAsync(basket);
+
+            return new BasketViewModel()
+            {
+                BuyerId = basket.BuyerId,
+                Id = basket.Id,
+                Items = new List<BasketItemViewModel>()
+            };
+        }
+    }
+}