/*
 * Hedgewars, a free turn based strategy game
 * Copyright (C) 2012 Simeon Maxein <smaxein@googlemail.com>
 *
 * This program 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 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

package org.hedgewars.hedgeroid;

import java.net.ConnectException;

import org.hedgewars.hedgeroid.Datastructures.GameConfig;
import org.hedgewars.hedgeroid.frontlib.Flib;
import org.hedgewars.hedgeroid.frontlib.Frontlib;
import org.hedgewars.hedgeroid.frontlib.Frontlib.BytesCallback;
import org.hedgewars.hedgeroid.frontlib.Frontlib.GameSetupPtr;
import org.hedgewars.hedgeroid.frontlib.Frontlib.GameconnPtr;
import org.hedgewars.hedgeroid.frontlib.Frontlib.IntCallback;
import org.hedgewars.hedgeroid.frontlib.Frontlib.StrBoolCallback;
import org.hedgewars.hedgeroid.frontlib.Frontlib.StrCallback;
import org.hedgewars.hedgeroid.frontlib.Frontlib.VoidCallback;
import org.hedgewars.hedgeroid.frontlib.NativeSizeT;
import org.hedgewars.hedgeroid.netplay.GameMessageListener;
import org.hedgewars.hedgeroid.netplay.Netplay;
import org.hedgewars.hedgeroid.util.TickHandler;

import android.os.Handler;
import android.os.HandlerThread;
import android.os.Looper;
import android.util.Log;

import com.sun.jna.Memory;
import com.sun.jna.Pointer;

/**
 * This class handles both talking to the engine (IPC) for running a game, and
 * coordinating with the netconn if it is a netgame, using the frontlib for the
 * actual IPC networking communication.
 * 
 * After creating the GameConnection object, it will communicate with the engine
 * on its own thread. It shuts itself down as soon as the connection to the engine
 * is lost.
 */
public final class GameConnection {
	private static final Handler mainHandler = new Handler(Looper.getMainLooper());
	
	public final int port;
	private final HandlerThread thread;
	private final Handler handler;
	private TickHandler tickHandler;
	private final Netplay netplay; // ==null if not a netgame
	private GameconnPtr conn;
	
	private GameConnection(GameconnPtr conn, Netplay netplay) {
		this.conn = conn;
		this.port = Flib.INSTANCE.flib_gameconn_getport(conn);
		this.netplay = netplay;
		this.thread = new HandlerThread("IPCThread");
		thread.start();
		this.handler = new Handler(thread.getLooper());
	}
	
	private void setupConnection() {
		tickHandler = new TickHandler(thread.getLooper(), 50, tickCb);
		tickHandler.start();
		
		if(netplay != null) {
			mainHandler.post(new Runnable() {
				public void run() { 
					netplay.registerGameMessageListener(gameMessageListener);
				}
			});
			Flib.INSTANCE.flib_gameconn_onChat(conn, chatCb, null);
			Flib.INSTANCE.flib_gameconn_onEngineMessage(conn, engineMessageCb, null);
		}
		Flib.INSTANCE.flib_gameconn_onConnect(conn, connectCb, null);
		Flib.INSTANCE.flib_gameconn_onDisconnect(conn, disconnectCb, null);
		Flib.INSTANCE.flib_gameconn_onErrorMessage(conn, errorMessageCb, null);
	}
	
	/**
	 * Start a new IPC server to communicate with the engine.
	 * Performs networking operations, don't run on the UI thread.
	 * @throws ConnectException if we can't set up the IPC server
	 */
	public static GameConnection forNetgame(final GameConfig config, Netplay netplay) throws ConnectException {
		final String playerName = netplay.getPlayerName();
		GameconnPtr conn = Flib.INSTANCE.flib_gameconn_create(playerName, GameSetupPtr.createJavaOwned(config), true);
		if(conn == null) {
			throw new ConnectException();
		}
		GameConnection result = new GameConnection(conn, netplay);
		result.setupConnection();
		return result;
	}
	
	/**
	 * Start a new IPC server to communicate with the engine.
	 * Performs networking operations, don't run on the UI thread.
	 * @throws ConnectException if we can't set up the IPC server
	 */
	public static GameConnection forLocalGame(final GameConfig config) throws ConnectException {
		GameconnPtr conn = Flib.INSTANCE.flib_gameconn_create("Player", GameSetupPtr.createJavaOwned(config), false);
		if(conn == null) {
			throw new ConnectException();
		}
		GameConnection result = new GameConnection(conn, null);
		result.setupConnection();
		return result;
	}
	
	private final Runnable tickCb = new Runnable() {
		public void run() {
			Flib.INSTANCE.flib_gameconn_tick(conn);
		}
	};
	
	// runs on the IPCThread
	private void shutdown() {
		tickHandler.stop();
		thread.quit();
		Flib.INSTANCE.flib_gameconn_destroy(conn);
		conn = null;
		if(netplay != null) {
			mainHandler.post(new Runnable() {
				public void run() {
					netplay.unregisterGameMessageListener(gameMessageListener);
				}
			});
		}
	}
	
	// runs on the IPCThread
	private final StrBoolCallback chatCb = new StrBoolCallback() {
		public void callback(Pointer context, String message, boolean teamChat) {
			if(teamChat) {
				netplay.sendTeamChat(message);
			} else {
				netplay.sendChat(message);
			}
		}
	};
	
	// runs on the IPCThread
	private final VoidCallback connectCb = new VoidCallback() {
		public void callback(Pointer context) {
			Log.i("GameConnection", "Connected");
		}
	};
	
	// runs on the IPCThread
	private final IntCallback disconnectCb = new IntCallback() {
		public void callback(Pointer context, int reason) {
			if(netplay != null) {
				netplay.sendRoundFinished(reason==Frontlib.GAME_END_FINISHED);
			}
			shutdown();
		}
	};
	
	// runs on the IPCThread
	private final BytesCallback engineMessageCb = new BytesCallback() {
		public void callback(Pointer context, Pointer buffer, NativeSizeT size) {
			netplay.sendEngineMessage(buffer.getByteArray(0, size.intValue()));
		}
	};
	
	// runs on the IPCThread
	private final StrCallback errorMessageCb = new StrCallback() {
		public void callback(Pointer context, String message) {
			Log.e("GameConnection", message);
		}
	};
	
	// runs on any thread
	private final GameMessageListener gameMessageListener = new GameMessageListener() {
		public void onNetDisconnected() {
			handler.post(new Runnable() {
				public void run() {
					Flib.INSTANCE.flib_gameconn_send_quit(conn);
				}
			});
		}
		
		public void onMessage(final int type, final String message) {
			handler.post(new Runnable() {
				public void run() {
					Flib.INSTANCE.flib_gameconn_send_textmsg(conn, type, message);
				}
			});
		}
		
		public void onEngineMessage(final byte[] em) {
			handler.post(new Runnable() {
				public void run() {
					Memory mem = new Memory(em.length);
					mem.write(0, em, 0, em.length);
					Flib.INSTANCE.flib_gameconn_send_enginemsg(conn, mem, NativeSizeT.valueOf(em.length));
				}
			});
		}
		
		public void onChatMessage(final String nick, final String message) {
			handler.post(new Runnable() {
				public void run() {
					Flib.INSTANCE.flib_gameconn_send_chatmsg(conn, nick, message);
				}
			});
		}
	};
}