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checkout

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This commit is contained in:
Tizian.Breuch
2025-09-25 16:15:00 +02:00
parent aaec80d7ad
commit d4dae319f3
3 changed files with 77 additions and 57 deletions
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79
Webshop.Application/Services/Customers/CheckoutService.cs
View File

@@ -4,6 +4,7 @@ using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Webshop.Application;
using Webshop.Application.DTOs.Customers;
using Webshop.Application.DTOs.Orders;
using Webshop.Application.Services.Customers.Interfaces;
@@ -25,12 +26,8 @@ namespace Webshop.Application.Services.Customers
private readonly IDiscountService _discountService;
public CheckoutService(
ApplicationDbContext context,
IOrderRepository orderRepository,
ICustomerRepository customerRepository,
IShippingMethodRepository shippingMethodRepository,
ISettingService settingService,
IDiscountService discountService)
ApplicationDbContext context, IOrderRepository orderRepository, ICustomerRepository customerRepository,
IShippingMethodRepository shippingMethodRepository, ISettingService settingService, IDiscountService discountService)
{
_context = context;
_orderRepository = orderRepository;
@@ -40,41 +37,31 @@ namespace Webshop.Application.Services.Customers
_discountService = discountService;
}
public async Task<(bool Success, OrderDetailDto? CreatedOrder, string? ErrorMessage)> CreateOrderAsync(CreateOrderDto orderDto, string? userId)
public async Task<ServiceResult<OrderDetailDto>> CreateOrderAsync(CreateOrderDto orderDto, string? userId)
{
await using var transaction = await _context.Database.BeginTransactionAsync();
try
{
// --- 1. Validierung von Kunde, Adressen und Methoden ---
Customer? customer = null;
if (!string.IsNullOrEmpty(userId))
{
customer = await _customerRepository.GetByUserIdAsync(userId);
if (customer == null) return (false, null, "Kundenprofil nicht gefunden.");
// 1. Validierung von Kunde, Adressen und Methoden
var customer = await _customerRepository.GetByUserIdAsync(userId!);
if (customer == null)
return ServiceResult.Fail<OrderDetailDto>(ServiceResultType.Unauthorized, "Kundenprofil nicht gefunden.");
// Validiere, dass die Adressen zum eingeloggten Kunden gehören
if (!await _context.Addresses.AnyAsync(a => a.Id == orderDto.ShippingAddressId && a.CustomerId == customer.Id) ||
!await _context.Addresses.AnyAsync(a => a.Id == orderDto.BillingAddressId && a.CustomerId == customer.Id))
{
return (false, null, "Ungültige oder nicht zugehörige Liefer- oder Rechnungsadresse.");
}
}
else
if (!await _context.Addresses.AnyAsync(a => a.Id == orderDto.ShippingAddressId && a.CustomerId == customer.Id) ||
!await _context.Addresses.AnyAsync(a => a.Id == orderDto.BillingAddressId && a.CustomerId == customer.Id))
{
// Gast-Checkout: Validierung der Gast-Daten
if (string.IsNullOrWhiteSpace(orderDto.GuestEmail))
return (false, null, "Für Gastbestellungen ist eine E-Mail-Adresse erforderlich.");
// Hinweis: Bei Gastbestellungen müssten die Adress-DTOs mitgesendet und hier neue Adressen erstellt werden.
// Der Einfachheit halber nehmen wir an, die Adress-IDs sind gültig, aber nicht mit einem Kunden verknüpft.
return ServiceResult.Fail<OrderDetailDto>(ServiceResultType.Forbidden, "Ungültige oder nicht zugehörige Liefer- oder Rechnungsadresse.");
}
var shippingMethod = await _shippingMethodRepository.GetByIdAsync(orderDto.ShippingMethodId);
if (shippingMethod == null || !shippingMethod.IsActive) return (false, null, "Ungültige oder inaktive Versandmethode.");
if (shippingMethod == null || !shippingMethod.IsActive)
return ServiceResult.Fail<OrderDetailDto>(ServiceResultType.InvalidInput, "Ungültige oder inaktive Versandmethode.");
var paymentMethod = await _context.PaymentMethods.FindAsync(orderDto.PaymentMethodId);
if (paymentMethod == null || !paymentMethod.IsActive) return (false, null, "Ungültige oder inaktive Zahlungsmethode.");
if (paymentMethod == null || !paymentMethod.IsActive)
return ServiceResult.Fail<OrderDetailDto>(ServiceResultType.InvalidInput, "Ungültige oder inaktive Zahlungsmethode.");
// --- 2. Artikel verarbeiten und Lagerbestand prüfen ---
// 2. Artikel verarbeiten und Lagerbestand prüfen
var orderItems = new List<OrderItem>();
var productIds = orderDto.Items.Select(i => i.ProductId).ToList();
var products = await _context.Products.Where(p => productIds.Contains(p.Id)).ToListAsync();
@@ -86,15 +73,15 @@ namespace Webshop.Application.Services.Customers
if (product == null || !product.IsActive)
{
await transaction.RollbackAsync();
return (false, null, $"Ein Produkt im Warenkorb ist nicht mehr verfügbar.");
return ServiceResult.Fail<OrderDetailDto>(ServiceResultType.Conflict, "Ein Produkt im Warenkorb ist nicht mehr verfügbar.");
}
if (product.StockQuantity < itemDto.Quantity)
{
await transaction.RollbackAsync();
return (false, null, $"Nicht genügend Lagerbestand für '{product.Name}'. Verfügbar: {product.StockQuantity}, benötigt: {itemDto.Quantity}.");
return ServiceResult.Fail<OrderDetailDto>(ServiceResultType.Conflict, $"Nicht genügend Lagerbestand für '{product.Name}'. Verfügbar: {product.StockQuantity}, benötigt: {itemDto.Quantity}.");
}
product.StockQuantity -= itemDto.Quantity; // Lagerbestand reduzieren
product.StockQuantity -= itemDto.Quantity;
var orderItem = new OrderItem
{
@@ -110,7 +97,7 @@ namespace Webshop.Application.Services.Customers
itemsTotal += orderItem.TotalPrice;
}
// --- 3. Preise, Rabatte, Steuern und Gesamtbetrag berechnen ---
// 3. Preise, Rabatte, Steuern und Gesamtbetrag berechnen
var discountResult = await _discountService.CalculateDiscountAsync(orderItems, orderDto.CouponCode);
decimal discountAmount = discountResult.TotalDiscountAmount;
decimal shippingCost = shippingMethod.BaseCost;
@@ -121,12 +108,10 @@ namespace Webshop.Application.Services.Customers
decimal taxAmount = subTotal * taxRate;
decimal orderTotal = subTotal + taxAmount;
// --- 4. Bestellung erstellen ---
// 4. Bestellung erstellen
var newOrder = new Order
{
CustomerId = customer?.Id,
GuestEmail = customer == null ? orderDto.GuestEmail : null,
GuestPhoneNumber = customer == null ? orderDto.GuestPhoneNumber : null,
CustomerId = customer.Id,
OrderNumber = $"WS-{DateTime.UtcNow:yyyyMMdd}-{new Random().Next(1000, 9999)}",
OrderDate = DateTimeOffset.UtcNow,
OrderStatus = OrderStatus.Pending.ToString(),
@@ -144,30 +129,24 @@ namespace Webshop.Application.Services.Customers
};
await _orderRepository.AddAsync(newOrder);
// --- 5. Rabattnutzung erhöhen ---
// 5. Rabattnutzung erhöhen
if (discountResult.AppliedDiscountIds.Any())
{
var appliedDiscounts = await _context.Discounts
.Where(d => discountResult.AppliedDiscountIds.Contains(d.Id))
.ToListAsync();
foreach (var discount in appliedDiscounts)
{
discount.CurrentUsageCount++;
}
var appliedDiscounts = await _context.Discounts.Where(d => discountResult.AppliedDiscountIds.Contains(d.Id)).ToListAsync();
foreach (var discount in appliedDiscounts) { discount.CurrentUsageCount++; }
}
await _context.SaveChangesAsync(); // Speichert Lagerbestandsänderungen & Rabattnutzung
await _context.SaveChangesAsync();
await transaction.CommitAsync();
// --- 6. Erfolgreiche Antwort erstellen ---
// 6. Erfolgreiche Antwort erstellen
var createdOrder = await _orderRepository.GetByIdAsync(newOrder.Id);
var orderDetailDto = MapToOrderDetailDto(createdOrder!);
return (true, orderDetailDto, null);
return ServiceResult.Ok(MapToOrderDetailDto(createdOrder!));
}
catch (Exception ex)
{
await transaction.RollbackAsync();
return (false, null, $"Ein unerwarteter Fehler ist aufgetreten: {ex.Message}");
return ServiceResult.Fail<OrderDetailDto>(ServiceResultType.Failure, $"Ein unerwarteter Fehler ist aufgetreten: {ex.Message}");
}
}

3
Webshop.Application/Services/Customers/Interfaces/ICheckoutService.cs
View File

@@ -1,12 +1,13 @@
// src/Webshop.Application/Services/Customers/Interfaces/ICheckoutService.cs
using System;
using System.Threading.Tasks;
using Webshop.Application;
using Webshop.Application.DTOs.Orders;
namespace Webshop.Application.Services.Customers.Interfaces
{
public interface ICheckoutService
{
Task<(bool Success, OrderDetailDto? CreatedOrder, string? ErrorMessage)> CreateOrderAsync(CreateOrderDto orderDto, string userId);
Task<ServiceResult<OrderDetailDto>> CreateOrderAsync(CreateOrderDto orderDto, string? userId);
}
}