/**
 * Helios, OpenSource Monitoring
 * Brought to you by the Helios Development Group
 *
 * Copyright 2007, Helios Development Group and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org. 
 *
 */
package org.helios.apmrouter.wsclient;

import java.net.SocketAddress;
import java.util.concurrent.atomic.AtomicReference;

import org.helios.apmrouter.util.SimpleLogger;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.ExceptionEvent;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.channel.SimpleChannelUpstreamHandler;
import org.jboss.netty.handler.codec.http.HttpResponse;
import org.jboss.netty.handler.codec.http.websocketx.CloseWebSocketFrame;
import org.jboss.netty.handler.codec.http.websocketx.PongWebSocketFrame;
import org.jboss.netty.handler.codec.http.websocketx.TextWebSocketFrame;
import org.jboss.netty.handler.codec.http.websocketx.WebSocketClientHandshaker;
import org.jboss.netty.handler.codec.http.websocketx.WebSocketFrame;
import org.jboss.netty.util.CharsetUtil;

/**
 * <p>Title: WebSocketClientHandler</p>
 * <p>Description: WebSocket client handler</p> 
 * <p>Company: Helios Development Group LLC</p>
 * @author Whitehead (nwhitehead AT heliosdev DOT org)
 * <p><code>org.helios.apmrouter.wsclient.WebSocketClientHandler</code></p>
 */

public class WebSocketClientHandler extends SimpleChannelUpstreamHandler {
	/** The handshaker for this websocket client handler */
	protected final WebSocketClientHandshaker handshaker;
	/** A reference to the remote socket address for this handler */
	protected final AtomicReference<SocketAddress> remoteSocketAddress = new AtomicReference<SocketAddress>(null);
	
	/**
	 * Creates a new WebSocketClientHandler
	 * @param handshaker The handshaker for this websocket client handler
	 */
	public WebSocketClientHandler(WebSocketClientHandshaker handshaker) {
		this.handshaker = handshaker;
	}
	
	/**
	 * Returns the remote socket address for this handler
	 * @return the remote socket address for this handler
	 */
	public SocketAddress getRemoteSocketAddress() {
		return remoteSocketAddress.get();
	}
	
    /**
     * {@inheritDoc}
     * @see org.jboss.netty.channel.SimpleChannelUpstreamHandler#messageReceived(org.jboss.netty.channel.ChannelHandlerContext, org.jboss.netty.channel.MessageEvent)
     */
    @Override
    public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception {
        Channel ch = ctx.getChannel();
        if (!handshaker.isHandshakeComplete()) {
            handshaker.finishHandshake(ch, (HttpResponse) e.getMessage());
            SimpleLogger.debug("WebSocketClient connected [" , e.getRemoteAddress() , "]");
            return;
        }

        if (e.getMessage() instanceof HttpResponse) {
            HttpResponse response = (HttpResponse) e.getMessage();
            throw new Exception("Unexpected HttpResponse (status=" + response.getStatus() + ", content="
                    + response.getContent().toString(CharsetUtil.UTF_8) + ")");
        }

        WebSocketFrame frame = (WebSocketFrame) e.getMessage();
        if (frame instanceof TextWebSocketFrame) {
            TextWebSocketFrame textFrame = (TextWebSocketFrame) frame;
            //SimpleLogger.debug("WebSocket Client received message: [" ,textFrame.getText(), "]");
            ctx.sendUpstream(e);
        } else if (frame instanceof PongWebSocketFrame) {
        	SimpleLogger.debug("WebSocket Client received pong from [", e.getRemoteAddress() , "]");
        } else if (frame instanceof CloseWebSocketFrame) {
        	SimpleLogger.debug("WebSocket Client Closing Connection To [", e.getRemoteAddress() , "]");
            ch.close();
        }
    }	
	
    /**
     * {@inheritDoc}
     * @see org.jboss.netty.channel.SimpleChannelUpstreamHandler#exceptionCaught(org.jboss.netty.channel.ChannelHandlerContext, org.jboss.netty.channel.ExceptionEvent)
     */
    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) throws Exception {
        final Throwable t = e.getCause();
        //t.printStackTrace();
        e.getChannel().close();
    }
	


}