/*

 * Hedgewars for Android. An Android port of 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.ByteArrayPtr;

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.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, ByteArrayPtr buffer, NativeSizeT size) {

            netplay.sendEngineMessage(buffer.deref(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() {

                    ByteArrayPtr ptr = ByteArrayPtr.createJavaOwned(em);

                    Flib.INSTANCE.flib_gameconn_send_enginemsg(conn, ptr, 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);

                }

            });

        }

    };

}