import java.security.*;
import java.io.*;
import java.net.*;
import java.util.*;

public class ATM {
    private static int atmPort;
    private static String prompt = "ATM: ";
    private static Socket s = null;

    private static void authenticateUser(String user) {

    }

    private static boolean interpretCommand(String command) {
	Scanner sc = new Scanner(command);
	String c = sc.next();
	if (c.equals("bye")) {
	    return true;
	}
	else if (c.equals("begin-session")) {
	    authenticateUser(sc.next());
	}
	// Handle other commands ...

	return false;
    }

    public static void main(String[] args) {
	if (args.length != 1) {
	    System.out.println("Usage: java ATM <ATM-port>");
	    System.exit(0);
	} 
	atmPort = Integer.parseInt(args[0]);
	try {
	    s = new Socket("localhost", atmPort);
	} catch (Exception e) {
	    e.printStackTrace();
	    System.exit(1);
	}

	System.out.print(prompt);
	BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));
	String userInput;
	try{
	    while( (userInput = stdIn.readLine()) != null ) {
		boolean stop = interpretCommand(userInput);
		if (stop) {
		    break;
		}
		System.out.print(prompt);
	    }
	} catch (IOException e) {
	    e.printStackTrace();
	}

	try {
	    stdIn.close();
	    s.close();
	} catch (IOException e) {
	    e.printStackTrace();
	}
    }

}