package org.moparscape.msc.gs.connection;

import org.apache.mina.common.IdleStatus;
import org.apache.mina.common.IoHandler;
import org.apache.mina.common.IoSession;
import org.apache.mina.filter.codec.ProtocolCodecFilter;
import org.moparscape.msc.gs.Instance;
import org.moparscape.msc.gs.Server;
import org.moparscape.msc.gs.core.LoginConnector;
import org.moparscape.msc.gs.util.Logger;


/**
 * Handles the protocol events fired from MINA.
 */
public class LSConnectionHandler implements IoHandler {
    /**
     * A reference to the login connector
     */
    private LoginConnector connector;

    /**
     * Creates a new connection handler for the given login connector.
     * 
     * @param connector
     *            The connector in use
     */
    public LSConnectionHandler(LoginConnector connector) {
	this.connector = connector;
    }

    /**
     * Invoked whenever an exception is thrown by MINA or this IoHandler.
     * 
     * @param session
     *            The associated session
     * @param cause
     *            The exception thrown
     */
    public void exceptionCaught(IoSession session, Throwable cause) {
    }

    /**
     * Invoked whenever a packet is ready to be added to the queue.
     * 
     * @param session
     *            The IO session on which the packet was received
     * @param message
     *            The packet
     */
    public void messageReceived(IoSession session, Object message) {
	if (session.isClosing()) {
	    return;
	}
	LSPacket p = (LSPacket) message;
	connector.getPacketQueue().add(p);
    }

    /**
     * Invoked whenever a packet is sent.
     * 
     * @param session
     *            The associated session
     * @param message
     *            The packet sent
     */
    public void messageSent(IoSession session, Object message) {
    }

    /**
     * Invoked whenever an IO session is closed. This must handle unregistering
     * the disconnecting player from the engine.
     * 
     * @param session
     *            The IO session which has been closed
     */
    public void sessionClosed(IoSession session) {
	Server server = Instance.getServer();
	if (server != null && server.running()) {
	    Logger.error(new Exception("Lost connection the login server!"));
	}
    }

    /**
     * Invoked whenever an IO session is created.
     * 
     * @param session
     *            The session opened
     */
    public void sessionCreated(IoSession session) {
	session.getFilterChain().addFirst("protocolFilter", new ProtocolCodecFilter(new LSCodecFactory()));
	// Logger.event("Connection to LOGIN_SERVER created");
    }

    /**
     * Invoked when the idle status of a session changes.
     * 
     * @param session
     *            The session in question
     * @param status
     *            The new idle status
     */
    public void sessionIdle(IoSession session, IdleStatus status) {
    }

    /**
     * Invoked when a new session is opened.
     * 
     * @param session
     *            The session opened
     */
    public void sessionOpened(IoSession session) {
    }
}