---

using System;

// 1. Принцип разделения интерфейсов (ISP)
public interface IEmailSender
{
    void SendEmail(string to, string subject, string body);
}

public interface ISmsSender
{
    void SendSms(string phone, string message);
}

// 2. Инверсия зависимостей: вводим абстракцию для логгера
public interface ILogger
{
    void Log(string message);
}

// 3. Выносим логику скидок (SRP и OCP)
public interface IDiscountStrategy
{
    decimal CalculateDiscount(Order order);
}

// Реализация логгера
public class FileLogger : ILogger
{
    public void Log(string message)
    {
        Console.WriteLine($"[LOG] {message}");
    }
}

// Реализации уведомлений
public class EmailSender : IEmailSender
{
    public void SendEmail(string to, string subject, string body)
    {
        Console.WriteLine($"Sending email to {to}: {subject} - {body}");
    }
}

public class SmsSender : ISmsSender
{
    public void SendSms(string phone, string message)
    {
        Console.WriteLine($"Sending SMS to {phone}: {message}");
    }
}

// Реализации стратегий скидок (LSP соблюден, контракт общий)
public class DefaultDiscountStrategy : IDiscountStrategy
{
    public decimal CalculateDiscount(Order order)
    {
        if (order.Total > 100) return order.Total * 0.1m;
        if (order.Total > 50) return order.Total * 0.05m;
        return 0;
    }
}

public class SpecialDiscountStrategy : IDiscountStrategy
{
    public decimal CalculateDiscount(Order order)
    {
        return order.Total >= 100 ? order.Total * 0.2m : 0; // Больше никаких исключений
    }
}

public class Order
{
    public int Id { get; set; }
    public decimal Total { get; set; }
}

public class OrderProcessor
{
    private readonly IEmailSender _emailSender;
    private readonly ISmsSender _smsSender;
    private readonly ILogger _logger;
    private readonly IDiscountStrategy _discountStrategy;

    // 4. Внедрение зависимостей (Dependency Injection)
    public OrderProcessor(
        IEmailSender emailSender, 
        ISmsSender smsSender, 
        ILogger logger, 
        IDiscountStrategy discountStrategy)
    {
        _emailSender = emailSender;
        _smsSender = smsSender;
        _logger = logger;
        _discountStrategy = discountStrategy;
    }

    public void Process(Order order, string customerEmail, string customerPhone)
    {
        _logger.Log($"Processing order {order.Id}");

        // Применяем скидку через абстракцию
        decimal discount = _discountStrategy.CalculateDiscount(order);
        order.Total -= discount;

        // Отправка уведомлений
        _emailSender.SendEmail(customerEmail, "Order processed", $"Total: {order.Total}");
        _smsSender.SendSms(customerPhone, $"Order {order.Id} total: {order.Total}");

        _logger.Log($"Finished processing order {order.Id}");
    }
}