PaymentSystem

PaymentSystem

namespace IMJunior
{
    class Program
    {
        static void Main(string[] args)
        {
            OrderForm orderForm = new OrderForm();
            PaymentSystemFactory factory = new PaymentSystemFactory();
            PaymentHandler paymentHandler = new PaymentHandler(factory);

            string systemId = orderForm.ShowForm();

            if (systemId == "QIWI")
                Console.WriteLine("Перевод на страницу QIWI...");
            else if (systemId == "WebMoney")
                Console.WriteLine("Вызов API WebMoney...");
            else if (systemId == "Card")
                Console.WriteLine("Вызов API банка эмитера карты Card...");

            paymentHandler.ShowPaymentResult(systemId);
        }
    }

    public class OrderForm
    {
        public string ShowForm()
        {
            Console.WriteLine("Мы принимаем: QIWI, WebMoney, Card");

            //симуляция веб интерфейса
            Console.WriteLine("Какое системой вы хотите совершить оплату?");
            return Console.ReadLine();
        }
    }

    public class PaymentHandler
    {
        private readonly PaymentSystemFactory _paymentFactory;

        public PaymentHandler(PaymentSystemFactory paymentfactory)
        {
            _paymentFactory = paymentfactory ?? throw new ArgumentNullException(nameof(paymentfactory));
        }

        public void ShowPaymentResult(string systemId)
        {
            Console.WriteLine($"Вы оплатили с помощью {systemId}");

            IPaymentSystem paymentSystem = _paymentFactory.GetPaymentSystem(systemId);
            paymentSystem.ProcessRequest();

            Console.WriteLine("Оплата прошла успешно!");
        }
    }

    public interface IPaymentSystem
    {
        public void ProcessRequest();
    }

    public class Qiwi : IPaymentSystem
    {
        public void ProcessRequest()
        {
            Console.WriteLine("Проверка платежа через QIWI...");
        }
    }

    public class WebMoney : IPaymentSystem
    {
        public void ProcessRequest()
        {
            Console.WriteLine("Проверка платежа через WebMoney...");
        }
    }

    public class Card : IPaymentSystem
    {
        public void ProcessRequest()
        {
            Console.WriteLine("Проверка платежа через Card...");
        }
    }

    public enum PaymentType
    {
        QIWI,
        WebMoney,
        Card
    }

    public class PaymentSystemFactory
    {
        private readonly Dictionary<PaymentType, IPaymentSystem> _paymentMap;

        public PaymentSystemFactory()
        {
            _paymentMap = new Dictionary<PaymentType, IPaymentSystem>();
            _paymentMap.Add(PaymentType.QIWI, new Qiwi());
            _paymentMap.Add(PaymentType.WebMoney, new WebMoney());
            _paymentMap.Add(PaymentType.Card, new Card());
        }

        public IPaymentSystem GetPaymentSystem(string typeName)
        {
            if (Enum.TryParse(typeName, out PaymentType paymentType))
                if (Enum.IsDefined(typeof(PaymentType), paymentType))
                    if (_paymentMap.ContainsKey(paymentType))
                        return _paymentMap[paymentType];

            throw new ArgumentOutOfRangeException(typeName);
        }
    }
}