package org.hedgewars.hedgeroid.netplay;

import java.io.File;

import java.io.FileNotFoundException;

import org.hedgewars.hedgeroid.R;

import org.hedgewars.hedgeroid.Utils;

import android.content.Context;

import android.content.Intent;

import android.content.res.Resources;

import android.os.Handler;

import android.os.HandlerThread;

import android.os.Looper;

import android.os.Message;

import android.support.v4.content.LocalBroadcastManager;

import android.util.Log;

import android.util.Pair;

import com.sun.jna.Pointer;

/**

 * This class manages the application's networking state.

 */

public class Netplay {

	public static enum State { NOT_CONNECTED, CONNECTING, LOBBY, ROOM, INGAME }

	// Extras in broadcasts

	public static final String EXTRA_PLAYERNAME = "playerName";

	public static final String EXTRA_MESSAGE = "message";

	public static final String EXTRA_HAS_ERROR = "hasError";

	public static final String EXTRA_REASON = "reason";

	private static final String ACTIONPREFIX = "org.hedgewars.hedgeroid.netconn.";

	public static final String ACTION_DISCONNECTED = ACTIONPREFIX+"DISCONNECTED";

	public static final String ACTION_CONNECTED = ACTIONPREFIX+"CONNECTED";

	public static final String ACTION_PASSWORD_REQUESTED = ACTIONPREFIX+"PASSWORD_REQUESTED";

	public static final String ACTION_ENTERED_ROOM_FROM_LOBBY = ACTIONPREFIX+"ENTERED_ROOM";

	public static final String ACTION_LEFT_ROOM = ACTIONPREFIX+"LEFT_ROOM";

	public static final String ACTION_STATE_CHANGED = ACTIONPREFIX+"STATE_CHANGED";

	public static final String DEFAULT_SERVER = "netserver.hedgewars.org";

	public static final int DEFAULT_PORT = 46631;

	private final Context appContext;

	private final LocalBroadcastManager broadcastManager;

	private final FromNetHandler fromNetHandler = new FromNetHandler();

	private int foregroundUsers = 0;	// Reference counter of clients requesting foreground tick speed (fast ticks)

	private boolean chief;				// Do we control the current room?

	// null if there is no running connection (==state is NOT_CONNECTED)

	private ThreadedNetConnection connection;

	public final Roomlist roomList = new Roomlist();

	public final MessageLog lobbyChatlog;

	public final MessageLog roomChatlog;

	public Netplay(Context appContext) {

		this.appContext = appContext;

		broadcastManager = LocalBroadcastManager.getInstance(appContext);

		lobbyChatlog = new MessageLog(appContext);

		roomChatlog = new MessageLog(appContext);

	}

	private void clearState() {

		roomList.clear();

		lobbyChatlog.clear();

	}

	public void connectToDefaultServer(String playerName) {

		connect(playerName, DEFAULT_SERVER, DEFAULT_PORT);

	}

	/**

	 * Establish a new connection. Only call if the current state is NOT_CONNECTED.

	 * 

	 * The state will switch to CONNECTING immediately. After that, it can asynchronously change to any other state.

	 * State changes are indicated by broadcasts. In particular, if an error occurs while trying to connect, the state

	 * will change back to NOT_CONNECTED and an ACTION_DISCONNECTED broadcast is sent.

	 */

	public void connect(String name, String host, int port) {

		if(state != State.NOT_CONNECTED) {

			throw new IllegalStateException("Attempt to start a new connection while the old one was still running.");

		}

		clearState();

		changeState(State.CONNECTING);

		connection = ThreadedNetConnection.startConnection(appContext, fromNetHandler, name, host, port);

		connection.setFastTickRate(foregroundUsers > 0);

	}

	public void sendPassword(String password) { sendToNet(ThreadedNetConnection.ToNetHandler.MSG_SEND_PASSWORD, password); }

	public void sendQuit(String message) { sendToNet(ThreadedNetConnection.ToNetHandler.MSG_SEND_QUIT, message); }

	public void sendRoomlistRequest() { sendToNet(ThreadedNetConnection.ToNetHandler.MSG_SEND_ROOMLIST_REQUEST); }

	public void sendPlayerInfoQuery(String name) { sendToNet(ThreadedNetConnection.ToNetHandler.MSG_SEND_PLAYER_INFO_REQUEST, name); }

	public void sendChat(String s) { sendToNet(ThreadedNetConnection.ToNetHandler.MSG_SEND_CHAT, s); }

	public void sendFollowPlayer(String nick) { sendToNet(ThreadedNetConnection.ToNetHandler.MSG_SEND_FOLLOW_PLAYER, nick); }

	public void sendJoinRoom(String name) { sendToNet(ThreadedNetConnection.ToNetHandler.MSG_SEND_JOIN_ROOM, name); }

	public void sendCreateRoom(String name) { sendToNet(ThreadedNetConnection.ToNetHandler.MSG_SEND_CREATE_ROOM, name); }

	public void sendLeaveRoom(String message) { sendToNet(ThreadedNetConnection.ToNetHandler.MSG_SEND_LEAVE_ROOM, message); }

	public void disconnect() { sendToNet(ThreadedNetConnection.ToNetHandler.MSG_DISCONNECT, "User Quit"); }

	private static Netplay instance;

	/**

	 * Retrieve the single app-wide instance of the netplay interface, creating it if it

	 * does not exist yet.

	 * 

	 * @param applicationContext

	 * @return

	 */

	public static Netplay getAppInstance(Context applicationContext) {

		if(instance == null) {

			// We'll just do it here and never quit it again...

			if(Flib.INSTANCE.flib_init() != 0) {

				throw new RuntimeException("Unable to start frontlib");

			}

			instance = new Netplay(applicationContext);

		}

		return instance;

	}

	public State getState() {

		return state;

	}

	private void changeState(State newState) {

		if(newState != state) {

			state = newState;

			broadcastManager.sendBroadcastSync(new Intent(ACTION_STATE_CHANGED));

		}

	}

	public boolean isChief() {

		return chief;

	}

	/**

	 * Indicate that you want network messages to be checked regularly (several times per second).

	 * As long as nobody requests fast ticks, the network is only checked once every few seconds

	 * to conserve battery power.

	 * Once you no longer need fast updates, call unrequestFastTicks.

	 */

	public void requestFastTicks() {

		if(foregroundUsers == Integer.MAX_VALUE) {

			throw new RuntimeException("Reference counter overflow");

		}

		if(foregroundUsers == 0 && connection != null) {

			connection.setFastTickRate(true);

		}

		foregroundUsers++;

	}

	public void unrequestFastTicks() {

		if(foregroundUsers == 0) {

			throw new RuntimeException("Reference counter underflow");

		}

		foregroundUsers--;

		if(foregroundUsers == 0 && connection != null) {

			connection.setFastTickRate(false);

		}

	}

	private boolean sendToNet(int what) {

		if(connection != null) {

			Handler handler = connection.toNetHandler;

			return handler.sendMessage(handler.obtainMessage(what));

		} else {

			return false;

		}

	}

	private boolean sendToNet(int what, Object obj) {

		if(connection != null) {

			Handler handler = connection.toNetHandler;

			return handler.sendMessage(handler.obtainMessage(what, obj));

		} else {

			return false;

		}

	}

	private MessageLog getCurrentLog() {

		if(state == State.ROOM || state == State.INGAME) {

			return roomChatlog;

		} else {

			return lobbyChatlog;

		}

	}

	/**

	 * Processes messages from the networking system. Always runs on the main thread.

	 */

	final class FromNetHandler extends Handler {

		public static final int MSG_LOBBY_JOIN = 0;

		public static final int MSG_LOBBY_LEAVE = 1;

		public static final int MSG_ROOM_JOIN = 2;

		public static final int MSG_ROOM_LEAVE = 3;

		public static final int MSG_CHAT = 4;

		public static final int MSG_MESSAGE = 5;

		public static final int MSG_ROOM_ADD = 6;

		public static final int MSG_ROOM_UPDATE = 7;

		public static final int MSG_ROOM_DELETE = 8;

		public static final int MSG_ROOMLIST = 9;

		public static final int MSG_CONNECTED = 10;

		public static final int MSG_DISCONNECTED = 11;

		public static final int MSG_PASSWORD_REQUEST = 12;

		public static final int MSG_ENTER_ROOM_FROM_LOBBY = 13;

		public static final int MSG_LEAVE_ROOM = 14;

		public FromNetHandler() {

			super(Looper.getMainLooper());

		}

		@SuppressWarnings("unchecked")

		@Override

		public void handleMessage(Message msg) {

			switch(msg.what) {

			case MSG_LOBBY_JOIN: {

				String name = (String)msg.obj;

				lobbyChatlog.appendPlayerJoin(name);

				break;

			}

			case MSG_LOBBY_LEAVE: {

				Pair<String, String> args = (Pair<String, String>)msg.obj;

				lobbyChatlog.appendPlayerLeave(args.first, args.second);

				break;

			}

			case MSG_ROOM_JOIN: {

				String name = (String)msg.obj;

				roomChatlog.appendPlayerJoin(name);

				break;

			}

			case MSG_ROOM_LEAVE: {

				Pair<String, String> args = (Pair<String, String>)msg.obj;

				roomChatlog.appendPlayerLeave(args.first, args.second);

				break;

			}

			case MSG_CHAT: {

				Pair<String, String> args = (Pair<String, String>)msg.obj;

				getCurrentLog().appendChat(args.first, args.second);

				break;

			}

			case MSG_MESSAGE: {

				getCurrentLog().appendMessage(msg.arg1, (String)msg.obj);

				break;

			}

			case MSG_ROOM_ADD: {

				break;

			}

			case MSG_ROOM_UPDATE: {

				roomList.updateRoom(args.first, args.second);

				break;

			}

			case MSG_ROOM_DELETE: {

				break;

			}

			case MSG_ROOMLIST: {

				break;

			}

			case MSG_CONNECTED: {

				changeState(State.LOBBY);

				broadcastManager.sendBroadcast(new Intent(ACTION_CONNECTED));

				break;

			}

			case MSG_DISCONNECTED: {

				Pair<Boolean, String> args = (Pair<Boolean, String>)msg.obj;

				changeState(State.NOT_CONNECTED);

				connection = null;

				Intent intent = new Intent(ACTION_DISCONNECTED);

				intent.putExtra(EXTRA_HAS_ERROR, args.first);

				intent.putExtra(EXTRA_MESSAGE, args.second);

				broadcastManager.sendBroadcastSync(intent);

				break;

			}

			case MSG_PASSWORD_REQUEST: {

				Intent intent = new Intent(ACTION_PASSWORD_REQUESTED);

				intent.putExtra(EXTRA_PLAYERNAME, (String)msg.obj);

				broadcastManager.sendBroadcast(intent);

				break;

			}

			case MSG_ENTER_ROOM_FROM_LOBBY: {

				roomChatlog.clear();

				changeState(State.ROOM);

				chief = (Boolean)msg.obj;

				Intent intent = new Intent(ACTION_ENTERED_ROOM_FROM_LOBBY);

				broadcastManager.sendBroadcastSync(intent);

				break;

			}

			case MSG_LEAVE_ROOM: {

				changeState(State.LOBBY);

				Intent intent = new Intent(ACTION_LEFT_ROOM);

				intent.putExtra(EXTRA_MESSAGE, (String)msg.obj);

				intent.putExtra(EXTRA_REASON, msg.arg1);

				broadcastManager.sendBroadcastSync(intent);

				break;

			}

			default: {

				Log.e("FromNetHandler", "Unknown message type: "+msg.what);

				break;

			}

			}

		}

	}

	/**

	 * This class handles the actual communication with the networking library, on a separate thread.

	 */

	private static class ThreadedNetConnection {

		private static final long TICK_INTERVAL_FAST = 100;

		private static final long TICK_INTERVAL_SLOW = 5000;

		public final ToNetHandler toNetHandler;

		private final Context appContext;

		private final FromNetHandler fromNetHandler;

		private final TickHandler tickHandler;

		/**

		 * conn can only be null while connecting (the first thing in the thread), and directly after disconnecting,

		 * in the same message (the looper is shut down on disconnect, so there will be no messages after that).

		 */

		private NetconnPtr conn;

		private String playerName;

		private ThreadedNetConnection(Context appContext, FromNetHandler fromNetHandler) {

			this.appContext = appContext;

			this.fromNetHandler = fromNetHandler;

			HandlerThread thread = new HandlerThread("NetThread");

			thread.start();

			toNetHandler = new ToNetHandler(thread.getLooper());

			tickHandler = new TickHandler(thread.getLooper(), TICK_INTERVAL_FAST, tickCb);

		}

		private void connect(final String name, final String host, final int port) {

			toNetHandler.post(new Runnable() {

				public void run() {

					playerName = name == null ? "Player" : name;

					MetaschemePtr meta = null;

					File dataPath;

					try {

						dataPath = Utils.getDataPathFile(appContext);

					} catch (FileNotFoundException e) {

						shutdown(true, appContext.getString(R.string.sdcard_not_mounted));

						return;

					}

					String metaschemePath = new File(dataPath, "metasettings.ini").getAbsolutePath();

					meta = FLIB.flib_metascheme_from_ini(metaschemePath);

					if(meta == null) {

						shutdown(true, appContext.getString(R.string.error_unexpected, "Missing metasettings.ini"));

						return;

					}

					conn = FLIB.flib_netconn_create(playerName, meta, dataPath.getAbsolutePath(), host, port);

					if(conn == null) {

						shutdown(true, appContext.getString(R.string.error_connection_failed));

						return;

					}

					FLIB.flib_netconn_onLobbyJoin(conn, lobbyJoinCb, null);

					FLIB.flib_netconn_onLobbyLeave(conn, lobbyLeaveCb, null);

					FLIB.flib_netconn_onRoomJoin(conn, roomJoinCb, null);

					FLIB.flib_netconn_onRoomLeave(conn, roomLeaveCb, null);

					FLIB.flib_netconn_onChat(conn, chatCb, null);

					FLIB.flib_netconn_onMessage(conn, messageCb, null);

					FLIB.flib_netconn_onRoomAdd(conn, roomAddCb, null);

					FLIB.flib_netconn_onRoomUpdate(conn, roomUpdateCb, null);

					FLIB.flib_netconn_onRoomDelete(conn, roomDeleteCb, null);

					FLIB.flib_netconn_onConnected(conn, connectedCb, null);

					FLIB.flib_netconn_onRoomlist(conn, roomlistCb, null);

					FLIB.flib_netconn_onDisconnected(conn, disconnectCb, null);

					FLIB.flib_netconn_onPasswordRequest(conn, passwordRequestCb, null);

					FLIB.flib_netconn_onEnterRoom(conn, enterRoomCb, null);

					FLIB.flib_netconn_onLeaveRoom(conn, leaveRoomCb, null);

					FLIB.flib_metascheme_release(meta);

					tickHandler.start();

				}

			});

		}

		public static ThreadedNetConnection startConnection(Context appContext, FromNetHandler fromNetHandler, String playerName, String host, int port) {

			ThreadedNetConnection result = new ThreadedNetConnection(appContext, fromNetHandler);

			result.connect(playerName, host, port);

			return result;

		}

		public void setFastTickRate(boolean fastTickRate) {

			tickHandler.setInterval(fastTickRate ? TICK_INTERVAL_FAST : TICK_INTERVAL_SLOW);

		}

		private final Runnable tickCb = new Runnable() {

			public void run() {

				FLIB.flib_netconn_tick(conn);

			}

		};

		private final StrCallback lobbyJoinCb = new StrCallback() {

			public void callback(Pointer context, String name) {

				sendFromNet(FromNetHandler.MSG_LOBBY_JOIN, name);

			}

		};

		private final StrStrCallback lobbyLeaveCb = new StrStrCallback() {

			public void callback(Pointer context, String name, String msg) {

				sendFromNet(FromNetHandler.MSG_LOBBY_LEAVE, Pair.create(name, msg));

			}

		};

		private final StrCallback roomJoinCb = new StrCallback() {