import java.io.*;
import java.net.*;

public class SmtpClient
{
	
	private BufferedReader from_server;
	private BufferedReader from_user;
	private PrintWriter to_server;
	private PrintWriter to_user;
	
	public SmtpClient(int p, String h)
	{
			try
			{
			
				String host = h;
				int port = p;
			
				Socket s = new Socket(host,port);
				from_server = new BufferedReader(new InputStreamReader(s.getInputStream()));
				to_server = new PrintWriter (new OutputStreamWriter(s.getOutputStream()));
				from_user = new BufferedReader(new InputStreamReader(System.in));
				to_user = new PrintWriter(new OutputStreamWriter(System.out));
			 }
			 catch (Exception e)
			 {
			 	System.err.println("Error occurred creating socket.");
			 	System.exit(1);
			 }
	}
	
	public void from(String f)
	{
		try
		{
			
			String from = f;
			String response = from_server.readLine();
			to_server.println("MAIL From:"+from);
			to_server.flush();
			response = from_server.readLine();
						
		}
		catch (Exception e)
		{
			System.err.println("Error occurred connecting to server.");
			System.exit(2);
		}
	}
	public void rcpt(String r)
	{
		
		try
		{
		
			String recipient = r;
			to_server.println("RCPT To:"+recipient);
			to_server.flush();
			String response = from_server.readLine();
				
		}
		catch (Exception e)
		{
			System.err.println("Error occurred negotiating connection.");
			System.exit(2);
		}
			
	}

  	public void message(String m)
	{
		
		try
		{
			String message = m;
			to_server.println("DATA");
			to_server.flush();
			String response = from_server.readLine();
			to_server.println(message);
			to_server.flush();
			to_server.println(".");
			to_server.flush();
			response = from_server.readLine();
		}
		catch (Exception e)
		{
			System.err.println("Error occurred sending message");
			System.exit(7);
		}
	}
  	
	public void quit()
	{

		try
		{
			to_server.println("QUIT");
			to_server.flush();
			String response = from_server.readLine();
		}
		catch (Exception e)
		{
			System.err.println("Error occurred quitting service");
			System.exit(5);
		}
	}
}