//Emailer
//Demonstrates socket programming
//connects to port 25 of klingon
//communicates through SMTP protocol directly
//Transcript of sample conversation:

//     HELO ds9.cs.iupui.edu
//     250 klingon.cs.iupui.edu Hello ds9 [134.68.140.211], pleased to meet you
//     MAIL from: aharris@cs.iupui.edu
//     250 aharris@cs.iupui.edu... Sender ok
//     RCPT to: aharris@cs.iupui.edu
//     250 aharris@cs.iupui.edu... Recipient ok
//     DATA
//     354 Enter mail, end with "." on a line by itself
//     subject: THis is a bogus piece of mail
//     .
//     250 OAA04502 Message accepted for delivery
//     quit


import java.io.*;
import java.net.*;
import java.awt.*;
import java.awt.event.*;


public class Emailer {
  public static void main(String args[]){
    Emailer em = new Emailer();
  } // end main

  public Emailer(){
    try {
      //generate screen-based IO
      InputStreamReader isr = new InputStreamReader(System.in);
      BufferedReader screenIn = new BufferedReader(isr);
      PrintStream screenOut = new PrintStream(System.out);    
  
      //generate socket IO connections
      Socket sock = new Socket("klingon.cs.iupui.edu", 25);
      PrintWriter sockOut = new PrintWriter(sock.getOutputStream());
      BufferedReader sockIn = new BufferedReader(
        new InputStreamReader(sock.getInputStream()));

      screenOut.println(sockIn.readLine());

      //read the initial input
      screenOut.println("connecting to socket");
       
      //write stuff to the socket
      screenOut.println("Sending HELO message...");
      sockOut.println("HELO ds9.cs.iupui.edu");
      //screenOut.println(sockIn.readLine());

      sockOut.println("MAIL from: aharris@cs.iupui.edu");
      sockOut.println("RCPT to: aharris@cs.iupui.edu");
      sockOut.println("DATA");
      sockOut.println("subject: a stupid email");
      sockOut.println("Really, I have nothing to say...");
      sockOut.println(".");
      //close down the connection
      screenOut.println("quitting");
      sockOut.println("QUIT");
      //screenOut.println(sockIn.readLine());
      
    } catch (Exception e){
      e.printStackTrace();
    } // end try
  } // end constructor
} // end class def