namespace IMJunior
{
    class Program
    {
        static void Main(string[] args)
        {
            var orderForm = new OrderForm();

            var paymentHandler = orderForm.ShowForm();

            paymentHandler.MakeCallback();
        }
    }
    public class OrderForm
    {
        private const string _qiwi = "QIWI";
        private const string _webMoney = "WebMoney";
        private const string _card = "Card";

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

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

            string systemId = Console.ReadLine();

            ISystemCallback result = systemId switch
            {
                "QIWI" => new QiwiSystemCallback(new QiwiPaymentHandler(_qiwi)),
                "WebMoney" => new WebMoneySystemCallback(new WebMoneyPaymentHandler(_webMoney)),
                "Card" => new CardSystemCallback(new CardPaymentHandler(_card)),
                _ => default
            };

            return result;
        }
    }

    public abstract class SystemCallback : ISystemCallback
    {
        protected IPaymentHandler PaymentHandler;

        protected SystemCallback(IPaymentHandler paymentHandler)
        {
            PaymentHandler = paymentHandler;
        }

        public abstract void MakeCallback();
    }

    public class QiwiSystemCallback : SystemCallback
    {
        public QiwiSystemCallback(IPaymentHandler paymentHandler) : base(paymentHandler)
        {
        }

        public override void MakeCallback()
        {
            Console.WriteLine("Перевод на страницу QIWI...");
            PaymentHandler.ShowPaymentResult();
        }
    }

    public class WebMoneySystemCallback : SystemCallback
    {
        public WebMoneySystemCallback(IPaymentHandler paymentHandler) : base(paymentHandler)
        {
        }

        public override void MakeCallback()
        {
            Console.WriteLine("Вызов API WebMoney...");
            PaymentHandler.ShowPaymentResult();
        }
    }

    public class CardSystemCallback : SystemCallback
    {
        public CardSystemCallback(IPaymentHandler paymentHandler) : base(paymentHandler)
        {
        }

        public override void MakeCallback()
        {
            Console.WriteLine("Вызов API банка эмитера карты Card...");
            PaymentHandler.ShowPaymentResult();
        }
    }

    public abstract class PaymentHandler : IPaymentHandler
    {
        protected readonly string SystemId;

        protected PaymentHandler(string systemId)
        {
            SystemId = systemId;
        }

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

    public class QiwiPaymentHandler : PaymentHandler
    {
        public QiwiPaymentHandler(string systemId) : base(systemId)
        {
        }

        public override void ShowPaymentResult()
        {
            base.ShowPaymentResult();
            Console.WriteLine("Проверка платежа через QIWI...");
            Console.WriteLine("Оплата прошла успешно!");
        }
    }

    public class WebMoneyPaymentHandler : PaymentHandler
    {
        public WebMoneyPaymentHandler(string systemId) : base(systemId)
        {
        }

        public override void ShowPaymentResult()
        {
            base.ShowPaymentResult();
            Console.WriteLine("Проверка платежа через WebMoney...");
            Console.WriteLine("Оплата прошла успешно!");
        }
    }

    public class CardPaymentHandler : PaymentHandler
    {
        public CardPaymentHandler(string systemId) : base(systemId)
        {
        }

        public override void ShowPaymentResult()
        {
            base.ShowPaymentResult();
            Console.WriteLine("Проверка платежа через Card...");
            Console.WriteLine("Оплата прошла успешно!");
        }
    }

    public interface ISystemCallback
    {
        public abstract void MakeCallback();

    }

    public interface IPaymentHandler
    {
        public void ShowPaymentResult();
    }
}