using System;
using System.Net.Mail;
using System.Net;


public interface ISender
{
    void SendMessage(string topic, string contents);
}
public abstract class Message
{

    public ISender Sender { get; set; }
    public string Topic { get; set; }

    public string Contents { get; set; }

    public string Podpis { get; set; }

    public abstract void Send();

}


public class MessageSystem : Message
{

    public override void Send()
    {
        Sender.SendMessage(Topic, Contents);
    }

}


public class MessageUser : Message
{
    public override void Send()
    {
        if(Podpis != null)
            Contents += "\n"+ Podpis;

        Sender.SendMessage(Topic, Contents);
    }

}



public class Email : ISender
{

    public void SendMessage(string topic, string contents)
    {
        Console.WriteLine("Email: " + topic + "\n" + contents);
      /*  var client = new SmtpClient("smtp.mailtrap.io", 2525)
        {
            //Credentials = new NetworkCredential(#################################),
            EnableSsl = true
        };
        client.Send("admin@wzorce.com", "mgodny@wzorce.com", topic, contents);
        */
    }

}




public class GG : ISender
{
    public void SendMessage(string topic, string contents)
    {
        Console.WriteLine("GG: " + topic + "\n" + contents);
    }
}
public class FB : ISender
{
    public void SendMessage(string topic, string contents)
    {
        Console.WriteLine("FB: " + topic + "\n" + contents);
    }
}

class Program
{

    static void Main(string[] args)
    {

        Console.WriteLine("------------------");

        ISender email = new Email();
        ISender fb = new FB();
        ISender gg = new GG();

        MessageSystem statement = new MessageSystem();
        statement.Topic = "Alert!";
        statement.Contents = "Wykryto wirusa!";

        statement.Sender = email;
        statement.Send();
        Console.WriteLine();

        statement.Sender = fb;
        statement.Send();
        Console.WriteLine();

        statement.Sender = gg;
        statement.Send();
        Console.WriteLine();


        MessageUser message = new MessageUser();
        message.Topic = "Życzenia";
        message.Contents = "Cześć, najlepsze życzenia z okazji dnia bez resetu serwera!";
        message.Podpis = "Twój Administrator";



        message.Sender = email;
        message.Send();


    }

}