/**
 * This file is part of aion-emu <aion-emu.com>.
 *
 *  aion-emu is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  aion-emu 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with aion-emu.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.aionemu.gameserver.network.loginserver;

import java.nio.ByteBuffer;
import java.util.HashMap;
import java.util.Map;

import org.apache.log4j.Logger;

import com.aionemu.gameserver.network.loginserver.LoginServerConnection.State;

/**
 * @author -Nemesiss-
 * @author Luno
 */
public class LsPacketHandler
{
	/**
	 * logger for this class
	 */
	private static final Logger							log					= Logger.getLogger(LsPacketHandler.class);

	private Map<State, Map<Integer, LsClientPacket>>	packetPrototypes	= new HashMap<State, Map<Integer, LsClientPacket>>();

	/**
	 * Reads one packet from given ByteBuffer
	 * 
	 * @param data
	 * @param client
	 * @return GsClientPacket object from binary data
	 */
	public LsClientPacket handle(ByteBuffer data, LoginServerConnection client)
	{
		State state = client.getState();
		int id = data.get() & 0xff;

		return getPacket(state, id, data, client);
	}

	public void addPacketPrototype(LsClientPacket packetPrototype, State... states)
	{
		for(State state : states)
		{
			Map<Integer, LsClientPacket> pm = packetPrototypes.get(state);
			if(pm == null)
			{
				pm = new HashMap<Integer, LsClientPacket>();
				packetPrototypes.put(state, pm);
			}
			pm.put(packetPrototype.getOpcode(), packetPrototype);
		}
	}

	private LsClientPacket getPacket(State state, int id, ByteBuffer buf, LoginServerConnection con)
	{
		LsClientPacket prototype = null;

		Map<Integer, LsClientPacket> pm = packetPrototypes.get(state);
		if(pm != null)
		{
			prototype = pm.get(id);
		}

		if(prototype == null)
		{
			unknownPacket(state, id);
			return null;
		}

		LsClientPacket res = prototype.clonePacket();
		res.setBuffer(buf);
		res.setConnection(con);

		return res;
	}

	/**
	 * Logs unknown packet.
	 * 
	 * @param state
	 * @param id
	 */
	private void unknownPacket(State state, int id)
	{
		log.warn(String.format("Unknown packet recived from Login Server: 0x%02X state=%s", id, state.toString()));
	}
}