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package com.googlecode.mycontainer.util.tunnel;

import java.io.Closeable;
import java.lang.Thread.UncaughtExceptionHandler;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import com.googlecode.mycontainer.util.ReflectionUtil;
import com.googlecode.mycontainer.util.Util;
import com.googlecode.mycontainer.util.log.Log;

public class Tunnels implements Closeable, Runnable, UncaughtExceptionHandler {

	private static Log LOG = Log.get(Util.class);

	private final List tunnels = new ArrayList();

	private TunnelHandler handler = new RedirectTunnelHandler();

	private Thread thread;

	public Tunnels() {
	}

	public Tunnels bind(Tunnel tunnel) {
		this.tunnels.add(tunnel);
		tunnel.bind();
		return this;
	}

	public void close() {
		for (Tunnel tunnel : tunnels) {
			Util.close(tunnel);
		}
	}

	public void run() {
		while (true) {
			Thread.yield();
			step();
		}
	}

	public void join() {
		try {
			getThread().join();
		} catch (InterruptedException e) {
			throw new RuntimeException(e);
		}
	}

	public void start() {
		getThread().start();
	}

	private Thread getThread() {
		if (thread == null) {
			thread = new Thread(this);
			thread.setUncaughtExceptionHandler(this);
		}
		return thread;
	}

	public void bindAll(Iterable list) {
		for (Tunnel tunnel : list) {
			bind(tunnel);
		}
	}

	public void setHandler(TunnelHandler handler) {
		this.handler = handler;
	}

	public void step() {
		Iterator it = tunnels.iterator();
		while (it.hasNext()) {
			Tunnel tunnel = it.next();
			if (tunnel.isClosed()) {
				it.remove();
				continue;
			}
			tunnel.closeFinisheds();
			tunnel.accepts(handler);
			tunnel.read(handler);
		}
	}

	public void uncaughtException(Thread t, Throwable e) {
		LOG.error("error on tunnels thread: " + t, e);
		Util.close(this);
	}

	public static void main(String[] args) {
		// args = new String[] { "Console", "0.0.0.0:5001:google.com:80",
		// "localhost:5002:chat.freenode.net:6667", "5003:localhost:5000" };
		if (args.length == 0 || "-h".equals(args[0]) || "--help".equals(args[0])) {
			System.out.println("Tunnels    ...");
			return;
		}

		String handlerName = args[0];
		TunnelHandler handler = (TunnelHandler) ReflectionUtil.newInstance(Tunnels.class.getPackage().getName() + "." + handlerName + "TunnelHandler");
		List list = new ArrayList();
		for (int i = 1; i < args.length; i++) {
			String str = args[i];
			Tunnel tunnel = Tunnel.parse(str);
			list.add(tunnel);
		}

		Tunnels tunnels = new Tunnels();
		try {
			tunnels.setHandler(handler);
			tunnels.bindAll(list);
			tunnels.run();
		} finally {
			Util.close(tunnels);
		}
	}

}