package jrummikub.control.network;

import java.util.UUID;

import javax.swing.SwingUtilities;

import jrummikub.model.GameSettings;
import jrummikub.util.Event;
import jrummikub.util.Event1;
import jrummikub.util.IEvent;
import jrummikub.util.IEvent1;
import jrummikub.util.LoginData;
import jrummikub.view.IGameListPanel.GameData;

import org.jivesoftware.smack.Connection;
import org.jivesoftware.smack.PacketListener;
import org.jivesoftware.smack.XMPPConnection;
import org.jivesoftware.smack.XMPPException;
import org.jivesoftware.smack.filter.AndFilter;
import org.jivesoftware.smack.filter.PacketExtensionFilter;
import org.jivesoftware.smack.filter.PacketTypeFilter;
import org.jivesoftware.smack.packet.DefaultPacketExtension;
import org.jivesoftware.smack.packet.Message;
import org.jivesoftware.smack.packet.Packet;
import org.jivesoftware.smack.packet.PacketExtension;
import org.jivesoftware.smack.packet.XMPPError;
import org.jivesoftware.smack.packet.XMPPError.Type;
import org.jivesoftware.smack.util.Base64;
import org.jivesoftware.smackx.muc.DiscussionHistory;
import org.jivesoftware.smackx.muc.MultiUserChat;

class ConnectionControl {
	private final static String ELEMENT_NAME = "rummikub";
	private final static String NAMESPACE = "http://home.universe-factory.net/rummikub/";

	private final LoginData loginData;
	private volatile Connection connection;
	private volatile MultiUserChat muc;

	private Event connectedEvent = new Event();
	private Event connectionFailedEvent = new Event();

	private Event1<GameData> gameOfferEvent = new Event1<GameData>();
	private Event1<UUID> gameWithdrawalEvent = new Event1<UUID>();

	private volatile GameData offeredGame;

	ConnectionControl(LoginData loginData) {
		this.loginData = loginData;
	}

	String getNickname() {
		return muc.getNickname();
	}

	void connect() {
		new Thread(new ConnectRunner()).start();
	}

	void disconnect() {
		connectedEvent = new Event();
		connectionFailedEvent = new Event();
		new Thread(new DisconnectRunner()).start();

	}

	IEvent getConnectedEvent() {
		return connectedEvent;
	}

	IEvent getConnectionFailedEvent() {
		return connectionFailedEvent;
	}

	IEvent1<GameData> getGameOfferEvent() {
		return gameOfferEvent;
	}

	IEvent1<UUID> getGameWithdrawalEvent() {
		return gameWithdrawalEvent;
	}

	void offerGame(GameData data) {
		offeredGame = data;

		sendGameOffer();
	}

	void withdrawGame(UUID uuid) {
		offeredGame = null;

		new Thread(new SendGameWithdrawRunner(uuid)).start();
	}

	private void sendGameOffer() {
		new Thread(new SendGameOfferRunner(offeredGame)).start();
	}

	private static void emitLater(final Event event) {
		SwingUtilities.invokeLater(new Runnable() {
			@Override
			public void run() {
				event.emit();
			}
		});
	}

	private Message createMessage(PacketExtension extension) {
		Message message = muc.createMessage();
		message.addExtension(extension);
		return message;
	}

	private static DefaultPacketExtension createJRummikubExtension() {
		return new DefaultPacketExtension(ELEMENT_NAME, NAMESPACE);
	}

	private void processPacket(Packet packet) {
		DefaultPacketExtension extension = (DefaultPacketExtension) packet
				.getExtension(ELEMENT_NAME, NAMESPACE);

		String messageType = extension.getValue("messageType");

		if (messageType.equals("game_offer")) {
			String host = packet.getFrom();
			host = host.substring(host.indexOf('/') + 1);

			UUID uuid = UUID.fromString(extension.getValue("uuid"));
			GameSettings settings = (GameSettings) Base64.decodeToObject(extension
					.getValue("gameSettings"));

			GameData gameData = new GameData(uuid, settings, host);
			gameOfferEvent.emit(gameData);
		} else if (messageType.equals("game_withdrawal")) {
			gameWithdrawalEvent.emit(UUID.fromString(extension.getValue("uuid")));
		} else if (messageType.equals("game_request")) {
			if (offeredGame != null) {
				sendGameOffer();
			}
		}
	}

	private Message createGameOfferMessage(GameData data) {
		DefaultPacketExtension extension = createJRummikubExtension();

		extension.setValue("messageType", "game_offer");
		extension.setValue("uuid", data.getGameID().toString());
		extension.setValue("gameSettings",
				Base64.encodeObject(data.getGameSettings(), Base64.GZIP));

		return createMessage(extension);
	}

	private Message createGameWithdrawMessage(UUID uuid) {
		DefaultPacketExtension extension = createJRummikubExtension();

		extension.setValue("messageType", "game_withdrawal");
		extension.setValue("uuid", uuid.toString());

		return createMessage(extension);
	}

	private Message createGameRequestMessage() {
		DefaultPacketExtension extension = createJRummikubExtension();

		extension.setValue("messageType", "game_request");

		return createMessage(extension);
	}

	private class ConnectRunner implements Runnable {
		@Override
		public void run() {
			synchronized (ConnectionControl.this) {
				connection = new XMPPConnection(loginData.getServerName());

				connection.addPacketListener(new PacketListener() {
					@Override
					public void processPacket(final Packet packet) {
						SwingUtilities.invokeLater(new Runnable() {
							@Override
							public void run() {
								ConnectionControl.this.processPacket(packet);
							}
						});

					}
				}, new AndFilter(new PacketTypeFilter(Message.class),
						new PacketExtensionFilter(ELEMENT_NAME, NAMESPACE)));

				try {
					doConnect();
				} catch (XMPPException e) {
					connection.disconnect();
					connection = null;

					// TODO Auto-generated catch block
					e.printStackTrace();

					emitLater(connectionFailedEvent);
				}
			}
		}

		private void doConnect() throws XMPPException {
			connection.connect();
			connection.login(loginData.getUserName(), loginData.getPassword(),
					"JRummikub");
			muc = new MultiUserChat(connection, loginData.getChannelName());
			DiscussionHistory history = new DiscussionHistory();
			history.setMaxStanzas(0);

			String nickname = loginData.getUserName();
			// Loop until a unused nickname is found
			while (true) {
				try {
					muc.join(nickname, null, history, 10000);
					break; // Join was successful, break the loop
				} catch (XMPPException e) {
					XMPPError error = e.getXMPPError();
					if (error.getType() == Type.CANCEL && error.getCode() == 409) {
						// There was a conflict, try again with another
						// nickname
						nickname += "_";
						continue;
					} else {
						// An unknown error has occurred, cancel connect
						throw e;
					}
				}
			}

			emitLater(connectedEvent);

			new Thread(new SendGameRequestRunner()).start();
		}
	}

	private class SendGameOfferRunner implements Runnable {
		private GameData data;

		public SendGameOfferRunner(GameData data) {
			this.data = data;
		}

		@Override
		public void run() {
			synchronized (ConnectionControl.this) {
				if (connection != null) {
					connection.sendPacket(createGameOfferMessage(data));
				}
			}
		}
	}

	private class SendGameWithdrawRunner implements Runnable {
		private UUID uuid;

		public SendGameWithdrawRunner(UUID uuid) {
			this.uuid = uuid;
		}

		@Override
		public void run() {
			synchronized (ConnectionControl.this) {
				if (connection != null) {
					connection.sendPacket(createGameWithdrawMessage(uuid));
				}
			}
		}
	}

	private class SendGameRequestRunner implements Runnable {
		@Override
		public void run() {
			synchronized (ConnectionControl.this) {
				if (connection != null) {
					connection.sendPacket(createGameRequestMessage());
				}
			}
		}
	}

	private class DisconnectRunner implements Runnable {
		@Override
		public void run() {
			synchronized (ConnectionControl.this) {
				if (connection != null) {
					connection.disconnect();
					connection = null;
				}
			}
		}
	}
}