Refactoring and Adding Tests (#28)

* Introducing repository and refactoring services.
Changing entities to use int keys everywhere.

* Refactoring application services to live in web project and only reference repositories, not EF contexts.

* Cleaning up implementations

* Moving logic out of CatalogController
Moving entity knowledge out of viewmodels.

* Implementing specification includes better for catalogservice

* Cleaning up and adding specification unit tests

src/Web/Interfaces/IBasketService.cs

@@ -0,0 +1,14 @@
+using Microsoft.eShopWeb.ViewModels;
+using System.Threading.Tasks;
+
+namespace ApplicationCore.Interfaces
+{
+    public interface IBasketService
+    {
+        Task<BasketViewModel> GetBasket(int basketId);
+        Task<BasketViewModel> CreateBasket();
+        Task<BasketViewModel> CreateBasketForUser(string userId);
+
+        Task AddItemToBasket(int basketId, int catalogItemId, decimal price, int quantity);
+    }
+}

src/Web/Interfaces/ICatalogService.cs

@@ -7,7 +7,7 @@ namespace Microsoft.eShopWeb.Services
 {
     public interface ICatalogService
     {
-        Task<Catalog> GetCatalogItems(int pageIndex, int itemsPage, int? brandID, int? typeId);
+        Task<CatalogIndexViewModel> GetCatalogItems(int pageIndex, int itemsPage, int? brandId, int? typeId);
         Task<IEnumerable<SelectListItem>> GetBrands();
         Task<IEnumerable<SelectListItem>> GetTypes();
     }