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package org.stewie.server.net.codec;

import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.handler.codec.frame.FrameDecoder;
import org.stewie.server.model.Player;
import org.stewie.server.model.PlayerInformation;
import org.stewie.server.packet.ISAACCipher;
import org.stewie.server.packet.Packet;
import org.stewie.server.model.World;
import org.stewie.server.net.Session;

/**
 *
 * @author Stewart Eunice
 */
public class LoginProtocolDecoder extends FrameDecoder {

    @Override
    protected Object decode(ChannelHandlerContext chc, Channel channel, ChannelBuffer buffer) throws Exception {
        Session session = new Session(chc.getChannel());
        Player player = new Player(session);
        chc.setAttachment(player);
        int loginType = -1, loginPacketSize = -1;
        if (buffer.readableBytes() >= 2) {
            loginType = buffer.readUnsignedByte();
            loginPacketSize = buffer.readUnsignedByte();
        }
        if (buffer.readableBytes() >= loginPacketSize) {
            byte[] payload = new byte[loginPacketSize];
            buffer.readBytes(payload);
            Packet loginPacket = new Packet(-1, payload);
            int expectedClientVersion = 317, expectedMagicNumber = 255;
            int recievedMagicNumber = loginPacket.readByte();
            int recievedClientVersion = loginPacket.readByte();
            if ((recievedClientVersion != expectedClientVersion) || (recievedMagicNumber != expectedMagicNumber)) {
                //Not sure the use of this except to check if client is up to date
            }
            boolean lowMemory = (loginPacket.readByte() != -1);
            for (int index = 0; index < 9; index++) {
                int data = loginPacket.readInt();//read the data indexes
            }
            loginPacket.readByte();//Useless
            int loginSessionMagicNumber = loginPacket.readByte() & 0xff;
            long clientSessionKey = loginPacket.readLong();
            long serverSessionKey = loginPacket.readLong();
            int uid = loginPacket.readInt(); // UID. User Session ID. SHOULD be 10.

            String Username = loginPacket.readRS2String();

            String Password = loginPacket.readRS2String();

            int sessionKey[] = new int[4];
            sessionKey[0] = (int) (clientSessionKey >> 32);
            sessionKey[1] = (int) clientSessionKey;
            sessionKey[2] = (int) (serverSessionKey >> 32);
            sessionKey[3] = (int) serverSessionKey;

            player.getSession().putAttribute("CYPTION_IN", new ISAACCipher(sessionKey));

            for (int index = 0; index < 4; index++) {
                sessionKey[index] += 50;
            }
            player.getSession().putAttribute("CRYPTION_OUT", new ISAACCipher(sessionKey));

            PlayerInformation information = new PlayerInformation(Username, Password);
            player.setPlayerInformation(information);

            World.getWorld().loadPlayer(player);

        }
        return null;
    }
}