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

/**
 * 
 * @author David Dao (ddao@arsdigita.com)
 * @author Stefan Deusch (stefan@arsdigita.com)
 * @creation-date December 6, 2000
 * @cvs-id $Id: adChatServer.java,v 1.1 2001/04/20 20:51:08 donb Exp $
 */
public class adChatServer {

    private int port;
    private int backlog = 50;
    private adChatDatasource datasource = new adChatDatasource();
    private boolean running = true;
    private ServerSocket server = null;

    public adChatServer(int port) {
	this.port = port;
    }

    /**
     * Listen for incoming java connection. For each connection
     * spawn a new thread.
     */
    public void start() {
	try {
	    server = new ServerSocket(port);
	    System.out.println("[" + new Date() + "] - Chat server listens on port " + port);
	    while(running) {
		Socket incoming = server.accept();
		if (running) {
		    System.out.println("[" + new Date() + "] - Connection from " + incoming);
		    adClientSession session = new adClientSession(this, incoming);
		    session.start();
		}
	    }
	} catch (IOException io) {
	    // Server shut down normally.
	} catch (Exception e) {
	    System.out.println("Socket server exception: " + e);
	}
	System.out.println("[" + new Date() + "] - Chat server shuts down.");
    }
    
    /**
     * Open tcp socket and send a bye message to the chat server.
     */
    public void stop() {
	try {
	    Socket socket = new Socket(InetAddress.getLocalHost(), port);
	    PrintWriter output = new PrintWriter(socket.getOutputStream(), true);	    
	    output.println("Bye");
	    output.close();
	} catch (Exception e) {
	    System.out.println("Exception in stoping server: " + e);
	}
    }

    /**
     * Shut down the current server.
     */
    public synchronized void shutdown() {
	running = false;
	try {
	    if (server != null)
		server.close();
	} catch(Exception e) {}
    }

    public adChatDatasource getDatasource() {
	return datasource;
    }

    public InetAddress getInetAddress() {
	return server.getInetAddress();
    }

    public static void main(String[] args) {
	if (args.length < 2) {
	    System.out.println("   Usuage: java adChatServer (start | stop) <port>");
	    return;
	}
	int port = Integer.parseInt(args[1]);
	adChatServer server = new adChatServer(port);
	if (args[0].equals("start")) 
	    server.start();
	else if (args[0].equals("stop"))
	    server.stop();
	else 
	    System.out.println("   Usuage: java adChatServer (start | stop) <port>");
	
    }
}