Cleaning things up and getting add item to cart working for anonymous or authenticated users.

src/Web/Services/BasketService.cs

@@ -0,0 +1,53 @@
+using ApplicationCore.Interfaces;
+using System.Threading.Tasks;
+using Microsoft.eShopWeb.ApplicationCore.Entities;
+using Microsoft.eShopWeb.Infrastructure;
+using Microsoft.EntityFrameworkCore;
+
+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)
+                .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();
+        }
+
+    }
+}