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| /// all required usings | |
| public sealed class OrderManager: IOrderManager | |
| { | |
| private IOrderValidator _validator; | |
| private IDeliveryManager _deliveryManager; | |
| private IRateExchange _rateExchange; | |
| private IAccountManager _accountManager; | |
| private IProductManager _productManager; | |
| private IEmailService _emailService; | |
| public OrderManager( | |
| IOrderValidator validator, | |
| IDeliveryManager deliveryManager, | |
| IRateExchange rateExchange, | |
| IAccountManager accountManager, | |
| IProductManager productManager, | |
| IEmailService emailService) | |
| { | |
| _validator = validator; | |
| _deliveryManager = deliveryManager; | |
| _rateExchange = rateExchange; | |
| _accountManager = accountManager; | |
| _productManager = productManager; | |
| _emailService = emailService; | |
| } | |
| public void ProcessOrder(Order order) | |
| { | |
| if (!validator.Validate(order)) | |
| { | |
| throw new Exception("Order is invalid"); | |
| } | |
| var user = _accountManager.GetUserById(order.UserId); | |
| var mailToUser = GenerateMailMessage(order, user); | |
| _emailService.Send(mailToUser); | |
| if (order.IsDeliverable) | |
| { | |
| _deliveryManager.Deliver(order, user); | |
| } | |
| } | |
| private MailMessage GenerateMailMessage(Order order, User user) | |
| { | |
| var mailBodyBuilder = new StringBuilder(); | |
| mailBodyBuilder.AppendLine($"Hello, {user.Name}!"); | |
| var rate = _rateExchange.GetRate(user.Currency); | |
| var dbProducts = order.Products.Select(orderProduct => _productManager.GetProduct(orderProduct.Id)); | |
| mailBodyBuilder.AppendLine(GetProductsText(dbProducts, rate)); | |
| return new MailMessage( | |
| _emailService.ShopEmail, | |
| user.Email, | |
| "Thank you for your order!", | |
| mailBodyBuilder.ToString()); | |
| } | |
| private string GetProductsText(IEnumerable<Product> products, double rate) | |
| { | |
| // Something processing | |
| } | |
| } |
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