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/**************************************************************************
 * Copyright 2011 Jules White
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ***************************************************************************/
package org.vt.ece4564.latmb;

import java.util.logging.Level;
import java.util.logging.Logger;

import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelEvent;
import org.jboss.netty.channel.ChannelFuture;
import org.jboss.netty.channel.ChannelFutureListener;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.ChannelStateEvent;
import org.jboss.netty.channel.ExceptionEvent;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.channel.SimpleChannelUpstreamHandler;

import android.util.Log;

/**
 * Handles a client-side channel.
 * 
 * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
 * @author <a href="http://gleamynode.net/">Trustin Lee</a>
 * 
 * @version $Rev: 2121 $, $Date: 2010-02-02 09:38:07 +0900 (Tue, 02 Feb 2010) $
 */
public class ClientHandler<T> extends SimpleChannelUpstreamHandler {

        private static final String TAG = ClientHandler.class.getName();
        
        private NetworkMessageHandler<T> listener_;

        private Channel channel_;

        private static final Logger logger = Logger
                        .getLogger(ClientHandler.class.getName());

        public void disconnect(){
                channel_.disconnect();
        }
        
        @Override
        public void handleUpstream(ChannelHandlerContext ctx, ChannelEvent e)
                        throws Exception {
                if (e instanceof ChannelStateEvent) {
                        logger.info(e.toString());
                }
                super.handleUpstream(ctx, e);
        }

        // @Override
        public void channelConnected(ChannelHandlerContext ctx, ChannelStateEvent e)
                        throws Exception {

                channel_ = e.getChannel();

                channel_.getCloseFuture().addListener(new ChannelFutureListener() {

                        @Override
                        public void operationComplete(ChannelFuture future)
                                        throws Exception {
                                listener_.channelClosed(channel_);
                        }
                });
        }

        @Override
        public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) {
                if (listener_ != null) {
                        T msg = (T) e.getMessage();
                        listener_.received(msg);
                } else {
                        System.err.println(e.getMessage());
                }
        }

        public void send(LATMBProtocol.TrackingMessage msg) {
                channel_.write(msg);
        }

        @Override
        public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) {
                logger.log(Level.WARNING, "Unexpected exception from downstream.",
                                e.getCause());
                e.getChannel().close();

                if(listener_ != null)
                        listener_.channelException(e.getCause());
                else
                        Log.e(TAG, "Error communicating with server",e.getCause());
        }

        public NetworkMessageHandler<T> getListener() {
                return listener_;
        }

        public void setListener(NetworkMessageHandler<T> listener) {
                listener_ = listener;
        }

}