cart

Webshop.Application/Services/Customers/CartService.cs

@@ -1,7 +1,12 @@
 using Microsoft.EntityFrameworkCore;
+using System;
 using System.Linq;
 using System.Threading.Tasks;
+using Webshop.Application;
+using Webshop.Application.DTOs.Customers;
+using Webshop.Application.DTOs.Shipping;
 using Webshop.Application.Services.Customers.Interfaces;
+using Webshop.Domain.Entities;
 using Webshop.Infrastructure.Data;
 
 namespace Webshop.Application.Services.Customers
@@ -15,24 +20,87 @@ namespace Webshop.Application.Services.Customers
             _context = context;
         }
 
+        public async Task<ServiceResult<CartDto>> GetCartAsync(string userId)
+        {
+            var cart = await GetCartEntity(userId);
+            if (cart == null) return ServiceResult.Ok(new CartDto()); // Leerer Warenkorb
+
+            var dto = new CartDto
+            {
+                Id = cart.Id,
+                UserId = userId,
+                Items = cart.Items.Select(i => new CartItemDto
+                {
+                    ProductId = i.ProductId,
+                    ProductVariantId = i.ProductVariantId,
+                    Quantity = i.Quantity
+                }).ToList()
+            };
+            return ServiceResult.Ok(dto);
+        }
+
+        public async Task<ServiceResult> AddToCartAsync(string userId, CartItemDto itemDto)
+        {
+            var cart = await GetCartEntity(userId);
+            if (cart == null)
+            {
+                cart = new Cart { UserId = userId, Id = Guid.NewGuid() };
+                _context.Carts.Add(cart);
+            }
+
+            var existingItem = cart.Items.FirstOrDefault(i => i.ProductId == itemDto.ProductId && i.ProductVariantId == itemDto.ProductVariantId);
+
+            if (existingItem != null)
+            {
+                existingItem.Quantity += itemDto.Quantity;
+            }
+            else
+            {
+                var newItem = new CartItem
+                {
+                    CartId = cart.Id,
+                    ProductId = itemDto.ProductId,
+                    ProductVariantId = itemDto.ProductVariantId,
+                    Quantity = itemDto.Quantity
+                };
+                cart.Items.Add(newItem); // Wichtig: Muss in CartItems DbSet landen
+                _context.CartItems.Add(newItem);
+            }
+
+            cart.LastModified = DateTime.UtcNow;
+            await _context.SaveChangesAsync();
+            return ServiceResult.Ok();
+        }
+
+        public async Task<ServiceResult> RemoveFromCartAsync(string userId, Guid productId)
+        {
+            var cart = await GetCartEntity(userId);
+            if (cart == null) return ServiceResult.Fail(ServiceResultType.NotFound, "Warenkorb leer.");
+
+            var item = cart.Items.FirstOrDefault(i => i.ProductId == productId);
+            if (item != null)
+            {
+                _context.CartItems.Remove(item);
+                await _context.SaveChangesAsync();
+            }
+            return ServiceResult.Ok();
+        }
+
         public async Task ClearCartAsync(string userId)
         {
-            // Wir suchen den Warenkorb des Users
-            // Annahme: Es gibt eine 'Carts' Tabelle und 'CartItems'
-            var cart = await _context.Carts
-                .Include(c => c.Items)
-                .FirstOrDefaultAsync(c => c.UserId == userId);
-
+            var cart = await GetCartEntity(userId);
             if (cart != null && cart.Items.Any())
             {
-                // Option A: Nur Items löschen, Warenkorb behalten
                 _context.CartItems.RemoveRange(cart.Items);
-
-                // Option B: Ganzen Warenkorb löschen (dann wird er beim nächsten AddToCart neu erstellt)
-                // _context.Carts.Remove(cart);
-
                 await _context.SaveChangesAsync();
             }
         }
+
+        private async Task<Cart?> GetCartEntity(string userId)
+        {
+            return await _context.Carts
+                .Include(c => c.Items)
+                .FirstOrDefaultAsync(c => c.UserId == userId);
+        }
     }
 }

Webshop.Application/Services/Customers/Interfaces/ICartService.cs

@@ -1,9 +1,14 @@
 using System.Threading.Tasks;
+using Webshop.Application.DTOs.Shipping; // Für CartItemDto
+using Webshop.Application; // Für ServiceResult
 
 namespace Webshop.Application.Services.Customers.Interfaces
 {
     public interface ICartService
     {
+        Task<ServiceResult<CartDto>> GetCartAsync(string userId);
+        Task<ServiceResult> AddToCartAsync(string userId, CartItemDto item);
+        Task<ServiceResult> RemoveFromCartAsync(string userId, Guid productId);
         Task ClearCartAsync(string userId);
     }
 }