/*

 * Hedgewars for Android. An Android port of Hedgewars, a free turn based strategy game

 * Copyright (c) 2011-2012 Richard Deurwaarder <xeli@xelification.com>

 * 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.io.IOException;

import java.io.UnsupportedEncodingException;

import java.net.ConnectException;

import javax.microedition.khronos.egl.EGL10;

import javax.microedition.khronos.egl.EGLConfig;

import javax.microedition.khronos.egl.EGLContext;

import javax.microedition.khronos.egl.EGLDisplay;

import javax.microedition.khronos.egl.EGLSurface;

import org.hedgewars.hedgeroid.Datastructures.GameConfig;

import org.hedgewars.hedgeroid.EngineProtocol.PascalExports;

import org.hedgewars.hedgeroid.netplay.Netplay;

import org.hedgewars.hedgeroid.util.FileUtils;

import android.app.Activity;

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.PixelFormat;

import android.hardware.Sensor;

import android.hardware.SensorEvent;

import android.hardware.SensorEventListener;

import android.hardware.SensorManager;

import android.media.AudioFormat;

import android.media.AudioManager;

import android.media.AudioTrack;

import android.os.Bundle;

import android.util.Base64;

import android.util.DisplayMetrics;

import android.util.Log;

import android.view.KeyEvent;

import android.view.MotionEvent;

import android.view.SurfaceHolder;

import android.view.SurfaceView;

import android.view.View;

/**

    SDL Activity

 */

public class SDLActivity extends Activity {

    /**

     * Set startConfig to the desired config when starting this activity. This avoids having to parcel all

     * the config objects into the Intent. Not particularly elegant, but it's actually a recommended

     * way to do this (http://developer.android.com/guide/faq/framework.html#3)

     */

    public static volatile GameConfig startConfig;

    public static volatile boolean startNetgame;

    // Main components

    public static SDLActivity mSingleton;

    private static SDLSurface mSurface;

    private static Thread mSDLThread;

    // Audio

    private static Thread mAudioThread;

    private static AudioTrack mAudioTrack;

    // EGL private objects

    private static EGLContext  mEGLContext;

    private static EGLSurface  mEGLSurface;

    private static EGLDisplay  mEGLDisplay;

    private static EGLConfig   mEGLConfig;

    private static int mGLMajor, mGLMinor;

    // Load the .so

    static {

        System.loadLibrary("SDL");

        System.loadLibrary("main");

    }

    // Setup

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        // So we can call stuff from static callbacks

        mSingleton = this;

        // Set up the surface

        mSurface = new SDLSurface(getApplication(), startConfig, startNetgame);

        startConfig = null;

        setContentView(mSurface);

    }

    // Events

    protected void onPause() {

        Log.v("SDL", "onPause()");

        super.onPause();

        if(mEGLDisplay != null && mEGLContext != null){

            EGL10 egl = (EGL10)EGLContext.getEGL();

            egl.eglDestroyContext(mEGLDisplay, mEGLContext);

            mEGLDisplay = null;

            mEGLContext = null;

        }

        SDLActivity.nativePause();

    }

    protected void onResume() {

        Log.v("SDL", "onResume()");

        super.onResume();

    }

    protected void onDestroy() {

        super.onDestroy();

        Log.v("SDL", "onDestroy()");

        // Send a quit message to the application

        SDLActivity.nativeQuit();

        // Now wait for the SDL thread to quit

        if (mSDLThread != null) {

            try {

                mSDLThread.join();

            } catch(Exception e) {

                Log.w("SDL", "Problem stopping thread: " + e);

            }

            mSDLThread = null;

        }

        mSingleton = null;

    }

    public static void synchronizedNativeInit(String...args) {

        synchronized(PascalExports.engineMutex) {

            nativeInit(args);

        }

    }

    // C functions we call

    private static native void nativeInit(String...args);

    public static native void nativeQuit();

    public static native void nativePause();

    public static native void nativeResume();

    public static native void onNativeResize(int x, int y, int format);

    public static native void onNativeKeyDown(int keycode);

    public static native void onNativeKeyUp(int keycode);

    public static native void onNativeTouch(int touchDevId, int pointerFingerId,

            int action, float x,

            float y, float p);

    public static native void onNativeAccel(float x, float y, float z);

    public static native void nativeRunAudioThread();

    // Java functions called from C

    public static boolean createGLContext(int majorVersion, int minorVersion) {

        return initEGL(majorVersion, minorVersion);

    }

    public static void flipBuffers() {

        flipEGL();

    }

    public static void setActivityTitle(final String title) {

        // Called from SDLMain() thread and can't directly affect the view

        mSingleton.runOnUiThread(new Runnable() {

            public void run() {

                mSingleton.setTitle(title);

            }

        });

    }

    public static Context getContext() {

        return mSingleton;

    }

    public static void startApp(final int width, final int height, GameConfig config, boolean netgame) {

        // Start up the C app thread

        if (mSDLThread == null) {

            mSDLThread = new Thread(new SDLMain(width, height, config, netgame));

            mSDLThread.start();

        } else {

            SDLActivity.nativeResume();

        }

    }

    // EGL functions

    public static boolean initEGL(int majorVersion, int minorVersion) {

        if (SDLActivity.mEGLDisplay == null) {

            try {

                EGL10 egl = (EGL10)EGLContext.getEGL();

                EGLDisplay dpy = egl.eglGetDisplay(EGL10.EGL_DEFAULT_DISPLAY);

                int[] version = new int[2];

                egl.eglInitialize(dpy, version);

                int EGL_OPENGL_ES_BIT = 1;

                int EGL_OPENGL_ES2_BIT = 4;

                int renderableType = 0;

                if (majorVersion == 2) {

                    renderableType = EGL_OPENGL_ES2_BIT;

                } else if (majorVersion == 1) {

                    renderableType = EGL_OPENGL_ES_BIT;

                }

                int[] configSpec = {

                        EGL10.EGL_RENDERABLE_TYPE, renderableType,

                        EGL10.EGL_NONE

                };

                EGLConfig[] configs = new EGLConfig[1];

                int[] num_config = new int[1];

                if (!egl.eglChooseConfig(dpy, configSpec, configs, 1, num_config) || num_config[0] == 0) {

                    Log.e("SDL", "No EGL config available");

                    return false;

                }

                EGLConfig config = configs[0];

                SDLActivity.mEGLDisplay = dpy;

                SDLActivity.mEGLConfig = config;

                SDLActivity.mGLMajor = majorVersion;

                SDLActivity.mGLMinor = minorVersion;

                SDLActivity.createEGLSurface();

            } catch(Exception e) {

                Log.v("SDL", e + "");

                for (StackTraceElement s : e.getStackTrace()) {

                    Log.v("SDL", s.toString());

                }

            }

        }

        else SDLActivity.createEGLSurface();

        return true;

    }

    public static boolean createEGLContext() {

        EGL10 egl = (EGL10)EGLContext.getEGL();

        int EGL_CONTEXT_CLIENT_VERSION=0x3098;

        int contextAttrs[] = new int[] { EGL_CONTEXT_CLIENT_VERSION, SDLActivity.mGLMajor, EGL10.EGL_NONE };

        SDLActivity.mEGLContext = egl.eglCreateContext(SDLActivity.mEGLDisplay, SDLActivity.mEGLConfig, EGL10.EGL_NO_CONTEXT, contextAttrs);

        if (SDLActivity.mEGLContext == EGL10.EGL_NO_CONTEXT) {

            Log.e("SDL", "Couldn't create context");

            return false;

        }

        return true;

    }

    public static boolean createEGLSurface() {

        if (SDLActivity.mEGLDisplay != null && SDLActivity.mEGLConfig != null) {

            EGL10 egl = (EGL10)EGLContext.getEGL();

            if (SDLActivity.mEGLContext == null) createEGLContext();

            Log.v("SDL", "Creating new EGL Surface");

            EGLSurface surface = egl.eglCreateWindowSurface(SDLActivity.mEGLDisplay, SDLActivity.mEGLConfig, SDLActivity.mSurface, null);

            if (surface == EGL10.EGL_NO_SURFACE) {

                Log.e("SDL", "Couldn't create surface");

                return false;

            }

            if (!egl.eglMakeCurrent(SDLActivity.mEGLDisplay, surface, surface, SDLActivity.mEGLContext)) {

                Log.e("SDL", "Old EGL Context doesnt work, trying with a new one");

                createEGLContext();

                if (!egl.eglMakeCurrent(SDLActivity.mEGLDisplay, surface, surface, SDLActivity.mEGLContext)) {

                    Log.e("SDL", "Failed making EGL Context current");

                    return false;

                }

            }

            SDLActivity.mEGLSurface = surface;

            return true;

        }

        return false;

    }

    // EGL buffer flip

    public static void flipEGL() {

        try {

            EGL10 egl = (EGL10)EGLContext.getEGL();

            egl.eglWaitNative(EGL10.EGL_CORE_NATIVE_ENGINE, null);

            // drawing here

            egl.eglWaitGL();

            egl.eglSwapBuffers(SDLActivity.mEGLDisplay, SDLActivity.mEGLSurface);

        } catch(Exception e) {

            Log.v("SDL", "flipEGL(): " + e);

            for (StackTraceElement s : e.getStackTrace()) {

                Log.v("SDL", s.toString());

            }

        }

    }

    // Audio

    private static Object buf;

    public static Object audioInit(int sampleRate, boolean is16Bit, boolean isStereo, int desiredFrames) {

        int channelConfig = isStereo ? AudioFormat.CHANNEL_CONFIGURATION_STEREO : AudioFormat.CHANNEL_CONFIGURATION_MONO;

        int audioFormat = is16Bit ? AudioFormat.ENCODING_PCM_16BIT : AudioFormat.ENCODING_PCM_8BIT;

        int frameSize = (isStereo ? 2 : 1) * (is16Bit ? 2 : 1);

        Log.v("SDL", "SDL audio: wanted " + (isStereo ? "stereo" : "mono") + " " + (is16Bit ? "16-bit" : "8-bit") + " " + ((float)sampleRate / 1000f) + "kHz, " + desiredFrames + " frames buffer");

        // Let the user pick a larger buffer if they really want -- but ye

        // gods they probably shouldn't, the minimums are horrifyingly high

        // latency already

        desiredFrames = Math.max(desiredFrames, (AudioTrack.getMinBufferSize(sampleRate, channelConfig, audioFormat) + frameSize - 1) / frameSize);

        mAudioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, sampleRate,

                channelConfig, audioFormat, desiredFrames * frameSize, AudioTrack.MODE_STREAM);

        audioStartThread();

        Log.v("SDL", "SDL audio: got " + ((mAudioTrack.getChannelCount() >= 2) ? "stereo" : "mono") + " " + ((mAudioTrack.getAudioFormat() == AudioFormat.ENCODING_PCM_16BIT) ? "16-bit" : "8-bit") + " " + ((float)mAudioTrack.getSampleRate() / 1000f) + "kHz, " + desiredFrames + " frames buffer");

        if (is16Bit) {

            buf = new short[desiredFrames * (isStereo ? 2 : 1)];

        } else {

            buf = new byte[desiredFrames * (isStereo ? 2 : 1)];

        }

        return buf;

    }

    public static void audioStartThread() {

        mAudioThread = new Thread(new Runnable() {

            public void run() {

                mAudioTrack.play();

                nativeRunAudioThread();

            }

        });

        // I'd take REALTIME if I could get it!

        mAudioThread.setPriority(Thread.MAX_PRIORITY);

        mAudioThread.start();

    }

    public static void audioWriteShortBuffer(short[] buffer) {

        for (int i = 0; i < buffer.length; ) {

            int result = mAudioTrack.write(buffer, i, buffer.length - i);

            if (result > 0) {

                i += result;

            } else if (result == 0) {

                try {

                    Thread.sleep(1);

                } catch(InterruptedException e) {

                    // Nom nom

                }

            } else {

                Log.w("SDL", "SDL audio: error return from write(short)");

                return;

            }

        }

    }

    public static void audioWriteByteBuffer(byte[] buffer) {

        for (int i = 0; i < buffer.length; ) {

            int result = mAudioTrack.write(buffer, i, buffer.length - i);

            if (result > 0) {

                i += result;

            } else if (result == 0) {

                try {

                    Thread.sleep(1);

                } catch(InterruptedException e) {

                    // Nom nom

                }

            } else {

                Log.w("SDL", "SDL audio: error return from write(short)");

                return;

            }

        }

    }

    public static void audioQuit() {

        if (mAudioThread != null) {

            try {

                mAudioThread.join();

            } catch(Exception e) {

                Log.v("SDL", "Problem stopping audio thread: " + e);

            }

            mAudioThread = null;

            //Log.v("SDL", "Finished waiting for audio thread");

        }

        if (mAudioTrack != null) {

            mAudioTrack.stop();

            mAudioTrack = null;

        }

    }

    public static int getDensity(){

        DisplayMetrics dm = SDLActivity.getContext().getResources().getDisplayMetrics();

        return dm.densityDpi;

    }

}

/**

    Simple nativeInit() runnable

 */

class SDLMain implements Runnable {

    public static final String TAG = "SDLMain";

    public static final int RQ_LOWRES            = 0x00000001; // use half land array

    public static final int RQ_BLURRY_LAND       = 0x00000002; // downscaled terrain

    public static final int RQ_NO_BACKGROUND     = 0x00000004; // don't draw background

    public static final int RQ_SIMPLE_ROPE       = 0x00000008; // avoid drawing rope

    public static final int RQ_2D_WATER          = 0x00000010; // disabe 3D water effect

    public static final int RQ_SIMPLE_EXPLOSIONS = 0x00000020; // no fancy explosion effects

    public static final int RQ_NO_FLAKES         = 0x00000040; // no flakes

    public static final int RQ_NO_MENU_ANIM      = 0x00000080; // ammomenu appears with no animation

    public static final int RQ_NO_DROPLETS       = 0x00000100; // no droplets

    public static final int RQ_NO_CLAMPING       = 0x00000200; // don't clamp textures

    public static final int RQ_NO_TOOLTIPS       = 0x00000400; // tooltips are not drawn

    public static final int RQ_NO_VSYNC          = 0x00000800; // don't sync on vblank

    private final int surfaceWidth, surfaceHeight;

    private final String playerName;

    private final GameConfig config;

    private final boolean netgame;

    public SDLMain(int width, int height, GameConfig config, boolean netgame) {

        surfaceWidth = width;

        surfaceHeight = height;

        if(netgame) {

            playerName = Netplay.getAppInstance(SDLActivity.getContext().getApplicationContext()).getPlayerName();

        } else {

            playerName = "Player";

        }

        this.config = config;

        this.netgame = netgame;

    }

    public void run() {

        //Set up the IPC socket server to communicate with the engine

        GameConnection gameConn;

        String path;

        try {

            if(netgame) {

                Netplay netplay = Netplay.getAppInstance(SDLActivity.mSingleton.getApplicationContext());

                gameConn = GameConnection.forNetgame(config, netplay);

            } else {

                gameConn = GameConnection.forLocalGame(config);

            }

            path = FileUtils.getDataPathFile(SDLActivity.mSingleton).getAbsolutePath();

            Log.d(TAG, "Starting engine");

            // Runs SDL_main() with added parameters

            try {

                String pPort = String.valueOf(gameConn.port);

                String pWidth = String.valueOf(surfaceWidth);

                String pHeight = String.valueOf(surfaceHeight);

                String pQuality = Integer.toString(RQ_NO_FLAKES|RQ_NO_DROPLETS|RQ_SIMPLE_EXPLOSIONS);

                String pPlayerName = Base64.encodeToString(playerName.getBytes("UTF-8"), 0);

                SDLActivity.synchronizedNativeInit(new String[] { pPort, pWidth, pHeight, pQuality, "en.txt", pPlayerName, "1", "1", "1", path, ""  });

            } catch (UnsupportedEncodingException e) {

                throw new AssertionError(e); // never happens

            }

            Log.d(TAG, "Engine stopped");

        } catch(ConnectException e) {

            Log.e(TAG, "Error starting IPC connection");

        } catch (IOException e) {

            Log.e(TAG, "Missing SDCard");

        }

        SDLActivity.mSingleton.runOnUiThread(new Runnable() { public void run() {

            if(SDLActivity.mSingleton != null) {

                SDLActivity.mSingleton.finish();

            }

        }});

    }

}

/**

    SDLSurface. This is what we draw on, so we need to know when it's created

    in order to do anything useful.

    Because of this, that's where we set up the SDL thread