package org.hedgewars.hedgeroid;

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.EngineProtocol.EngineProtocolNetwork;

import org.hedgewars.hedgeroid.EngineProtocol.GameConfig;

import org.hedgewars.hedgeroid.EngineProtocol.PascalExports;

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.os.Handler;

import android.os.Message;

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 {

	// Main components

	public static SDLActivity mSingleton;

	private static SDLSurface mSurface;

	// This is what SDL runs in. It invokes SDL_main(), eventually

	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("SDL_image");

		//System.loadLibrary("SDL_mixer");

		//System.loadLibrary("SDL_ttf");

		System.loadLibrary("main");

	}

	// Setup

	protected void onCreate(Bundle savedInstanceState) {

		//Log.v("SDL", "onCreate()");

		super.onCreate(savedInstanceState);

		// So we can call stuff from static callbacks

		mSingleton = this;

		// Set up the surface

		GameConfig config = getIntent().getParcelableExtra("config");

		mSurface = new SDLSurface(getApplication(), config);

		setContentView(mSurface);

		SurfaceHolder holder = mSurface.getHolder();

	}

	// 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();

	}

	public void onBackPressed(){

		super.onBackPressed();

		PascalExports.HWterminate(true);

	}

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

			}

			mSDLThread = null;

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

		}

	}

	// Messages from the SDLMain thread

	static int COMMAND_CHANGE_TITLE = 1;

	// Handler for the messages

	Handler commandHandler = new Handler() {

		public void handleMessage(Message msg) {

			if (msg.arg1 == COMMAND_CHANGE_TITLE) {

				setTitle((String)msg.obj);

			}

		}

	};

	// Send a message from the SDLMain thread

	void sendCommand(int command, Object data) {

		Message msg = commandHandler.obtainMessage();

		msg.arg1 = command;

		msg.obj = data;

		commandHandler.sendMessage(msg);

	}

	// C functions we call

	public 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(String title) {

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

		mSingleton.sendCommand(COMMAND_CHANGE_TITLE, title);

	}

	public static Context getContext() {

		return mSingleton;

	}

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

		// Start up the C app thread

		if (mSDLThread == null) {

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

			mSDLThread.start();

		}

		else {

			SDLActivity.nativeResume();

		}

	}

	// EGL functions

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

		if (SDLActivity.mEGLDisplay == null) {

			//Log.v("SDL", "Starting up OpenGL ES " + majorVersion + "." + minorVersion);

			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_DEPTH_SIZE,   16,

						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];

				/*int EGL_CONTEXT_CLIENT_VERSION=0x3098;

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

                EGLContext ctx = egl.eglCreateContext(dpy, config, EGL10.EGL_NO_CONTEXT, contextAttrs);

                if (ctx == EGL10.EGL_NO_CONTEXT) {

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

                    return false;

                }

                SDLActivity.mEGLContext = ctx;*/

				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;

		}

	}

}

/**

    Simple nativeInit() runnable

 */

class SDLMain implements Runnable {

	private int surfaceWidth, surfaceHeight;

	private GameConfig config;

	public SDLMain(int width, int height, GameConfig _config) {

		config = _config;

		surfaceWidth = width;

		surfaceHeight = height;

	}

	public void run() {

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

		EngineProtocolNetwork ipc = new EngineProtocolNetwork(config);

		String path = Utils.getDataPath(SDLActivity.mSingleton);//This represents the data directory

		path = path.substring(0, path.length()-1);//remove the trailing '/'

		// Runs SDL_main() with added parameters

		SDLActivity.nativeInit(new String[] { String.valueOf(ipc.port),

				String.valueOf(surfaceWidth), String.valueOf(surfaceHeight),

				"0", "null", "xeli", "1", "1", "1", path, ""  });

		try {

			ipc.quitIPC();

			ipc.join();

		} catch (InterruptedException e) {

			e.printStackTrace();

		}

		//Log.v("SDL", "SDL thread terminated");

		//Log.v("SDL", "SDL thread terminated");

	}

}

/**

    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

 */

class SDLSurface extends SurfaceView implements SurfaceHolder.Callback, 

View.OnKeyListener, View.OnTouchListener, SensorEventListener  {

	private GameConfig config;

	// Sensors

	private static SensorManager mSensorManager;

	// Startup    

	public SDLSurface(Context context, GameConfig _config) {

		super(context);

		getHolder().addCallback(this); 

		setFocusable(true);

		setFocusableInTouchMode(true);

		requestFocus();

		setOnKeyListener(this); 

		setOnTouchListener(this);   

		mSensorManager = (SensorManager)context.getSystemService("sensor");

		config = _config;

	}

	// Called when we have a valid drawing surface

	public void surfaceCreated(SurfaceHolder holder) {

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

		holder.setType(SurfaceHolder.SURFACE_TYPE_GPU);

		SDLActivity.createEGLSurface();

//		enableSensor(Sensor.TYPE_ACCELEROMETER, true);

	}

	// Called when we lose the surface

	public void surfaceDestroyed(SurfaceHolder holder) {

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

		SDLActivity.nativePause();

//		enableSensor(Sensor.TYPE_ACCELEROMETER, false);

	}

	// Called when the surface is resized