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/Infrastructure/Services/BasketService.cs

@@ -1,63 +0,0 @@
-using ApplicationCore.Interfaces;
-using System.Threading.Tasks;
-using Microsoft.eShopWeb.ApplicationCore.Entities;
-using Microsoft.EntityFrameworkCore;
-using System;
-using Infrastructure.Data;
-
-namespace Web.Services
-{
-    public class BasketService : IBasketService
-    {
-        private readonly CatalogContext _context;
-
-        public BasketService(CatalogContext context)
-        {
-            _context = context;
-        }
-        public async Task<Basket> GetBasket(string basketId)
-        {
-            var basket = await _context.Baskets
-                .Include(b => b.Items)
-                .ThenInclude(i => i.Item)
-                .FirstOrDefaultAsync(b => b.Id == basketId);
-            if (basket == null)
-            {
-                basket = new Basket();
-                _context.Baskets.Add(basket);
-                await _context.SaveChangesAsync();
-            }
-            return basket;
-        }
-
-        public Task<Basket> CreateBasket()
-        {
-            return CreateBasketForUser(null);
-        }
-
-        public async Task<Basket> CreateBasketForUser(string userId)
-        {
-            var basket = new Basket();
-            _context.Baskets.Add(basket);
-            await _context.SaveChangesAsync();
-
-            return basket;
-        }
-
-
-        //public async Task UpdateBasket(Basket basket)
-        //{
-        //    // only need to save changes here
-        //    await _context.SaveChangesAsync();
-        //}
-
-        public async Task AddItemToBasket(Basket basket, int productId, int quantity)
-        {
-            var item = await _context.CatalogItems.FirstOrDefaultAsync(i => i.Id == productId);
-
-            basket.AddItem(item, item.Price, quantity);
-
-            await _context.SaveChangesAsync();
-        }
-    }
-}