/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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 com.rndchina.aisin.chat.client;

import org.apache.mina.core.service.IoHandler;
import org.apache.mina.core.service.IoHandlerAdapter;
import org.apache.mina.core.session.IoSession;

import com.rndchina.aisin.chat.model.ChatCommand;

/**
 * {@link IoHandler} implementation of the client side of the simple chat
 * protocol.
 * 
 * @author <a href="http://mina.apache.org">Apache MINA Project</a>
 */
public class ChatClientHandler extends IoHandlerAdapter {

	public interface Callback {
		void connected();

		void loggedIn();

		void loggedOut();

		void disconnected();

		void messageReceived(String message);

		void error(String message);
	}

	private final Callback callback;

	public ChatClientHandler(Callback callback) {
		this.callback = callback;
	}

	@Override
	public void sessionOpened(IoSession session) throws Exception {
		callback.connected();
	}

	@Override
	public void messageReceived(IoSession session, Object message)
			throws Exception {
		String theMessage = (String) message;
		String[] result = theMessage.split(" ", 3);
		String status = result[1];
		String theCommand = result[0];
		ChatCommand command = ChatCommand.valueOf(theCommand);

		if ("OK".equals(status)) {

			switch (command.toInt()) {

			case ChatCommand.BROADCAST:
				if (result.length == 3) {
					callback.messageReceived(result[2]);
				}
				break;
			case ChatCommand.LOGIN:
				callback.loggedIn();
				break;

			case ChatCommand.QUIT:
				callback.loggedOut();
				break;
			}

		} else {
			if (result.length == 3) {
				callback.error(result[2]);
			}
		}
	}

	@Override
	public void sessionClosed(IoSession session) throws Exception {
		callback.disconnected();
	}

}
