/*******************************************************************************

 This file links the Java side of Android with libsdl

*******************************************************************************/

#include <jni.h>

#include <sys/time.h>

#include <time.h>

#include <android/log.h>

#include <stdint.h>

#include <stdio.h>

#include <stdlib.h>

#include <math.h>

#include <pthread.h>

#define DEBUG

/*******************************************************************************

                               Globals

*******************************************************************************/

static long _getTime(void){

	struct timeval  now;

	gettimeofday(&now, NULL);

	return (long)(now.tv_sec*1000 + now.tv_usec/1000);

}

JNIEnv* mEnv = NULL;

JNIEnv* mAudioThreadEnv = NULL; //See the note below for why this is necessary

JavaVM* mVM = NULL;

//Main activity

jclass mActivityInstance;

//method signatures

jmethodID midCreateGLContext;

jmethodID midFlipBuffers;

jmethodID midEnableFeature;

jmethodID midUpdateAudio;

extern "C" int SDL_main(int argc, char *argv[]);

extern "C" int Android_OnKeyDown(int keycode);

extern "C" int Android_OnKeyUp(int keycode);

extern "C" void Android_SetScreenResolution(int width, int height);

extern "C" void Android_OnResize(int width, int height, int format);

extern "C" int SDL_SendQuit();

extern "C" void Android_EnableFeature(int featureid, bool enabled);

//If we're not the active app, don't try to render

bool bRenderingEnabled = false;

//Feature IDs

static const int FEATURE_AUDIO = 1;

static const int FEATURE_ACCEL = 2;

//Accelerometer data storage

float fLastAccelerometer[3];

/*******************************************************************************

                 Functions called by JNI

*******************************************************************************/	

//Library init

extern "C" jint JNI_OnLoad(JavaVM* vm, void* reserved){

    JNIEnv* env = NULL;

    jint result = -1;

    if (vm->GetEnv((void**) &env, JNI_VERSION_1_4) != JNI_OK) {

        return result;

    }

    mEnv = env;

    __android_log_print(ANDROID_LOG_INFO, "SDL", "JNI: OnLoad");

    jclass cls = mEnv->FindClass ("org/libsdl/app/SDLActivity"); 

    mActivityInstance = cls;

    midCreateGLContext = mEnv->GetStaticMethodID(cls,"createGLContext","()V");

    midFlipBuffers = mEnv->GetStaticMethodID(cls,"flipBuffers","()V");

    midEnableFeature = mEnv->GetStaticMethodID(cls,"enableFeature","(II)V");

    midUpdateAudio = mEnv->GetStaticMethodID(cls,"updateAudio","([B)V");

    if(!midCreateGLContext || !midFlipBuffers || !midEnableFeature ||

        !midUpdateAudio){

        __android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: Bad mids\n");

    }else{

#ifdef DEBUG

        __android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: Good mids\n");

#endif

    }

    return JNI_VERSION_1_4;

}

//Start up the SDL app

extern "C" void Java_org_libsdl_app_SDLActivity_nativeInit( JNIEnv* env, 

                                                                jobject obj ){ 

	__android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: Native Init");

	mEnv = env;

	bRenderingEnabled = true;

	Android_EnableFeature(FEATURE_ACCEL, true);

}

//Keydown

extern "C" void Java_org_libsdl_app_SDLActivity_onNativeKeyDown(JNIEnv* env, 

               jobject obj, jint keycode){

    int r = Android_OnKeyDown(keycode);

#ifdef DEBUG

    __android_log_print(ANDROID_LOG_INFO, "SDL", 

                        "SDL: native key down %d, %d\n", keycode, r);

#endif

}

//Keyup

extern "C" void Java_org_libsdl_app_SDLActivity_onNativeKeyUp(JNIEnv* env, 

               jobject obj, jint keycode){

    int r = Android_OnKeyUp(keycode);

#ifdef DEBUG

    __android_log_print(ANDROID_LOG_INFO, "SDL", 

                        "SDL: native key up %d, %d\n", keycode, r);

#endif

}

//Touch

extern "C" void Java_org_libsdl_app_SDLActivity_onNativeTouch(JNIEnv* env, 

               jobject obj, jint action, jfloat x, jfloat y, jfloat p){

#ifdef DEBUG

    __android_log_print(ANDROID_LOG_INFO, "SDL", 

                        "SDL: native touch event %d @ %f/%f, pressure %f\n", 

                        action, x, y, p);

#endif

    //TODO: Pass this off to the SDL multitouch stuff

}

//Quit

extern "C" void Java_org_libsdl_app_SDLActivity_nativeQuit( JNIEnv*  env, 

                                                                jobject obj ){    

    //Stop rendering as we're no longer in the foreground

	bRenderingEnabled = false;

    //Inject a SDL_QUIT event

    int r = SDL_SendQuit();

    __android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: Native quit %d", r);        

}

//Screen size

extern "C" void Java_org_libsdl_app_SDLActivity_nativeSetScreenSize(

                JNIEnv*  env, jobject obj, jint width, jint height){

    __android_log_print(ANDROID_LOG_INFO, "SDL", 

                        "SDL: Set screen size on init: %d/%d\n", width, height);

    Android_SetScreenResolution(width, height);

}

//Resize

extern "C" void Java_org_libsdl_app_SDLActivity_onNativeResize(

                                        JNIEnv*  env, jobject obj, jint width, 

                                        jint height, jint format){

    Android_OnResize(width, height, format);

}

extern "C" void Java_org_libsdl_app_SDLActivity_onNativeAccel(

                                        JNIEnv*  env, jobject obj,

                                        jfloat x, jfloat y, jfloat z){

    fLastAccelerometer[0] = x;

    fLastAccelerometer[1] = y;

    fLastAccelerometer[2] = z;   

}

/*******************************************************************************

             Functions called by SDL into Java

*******************************************************************************/

extern "C" void Android_CreateContext(){

	__android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: sdl_create_context()\n");

	bRenderingEnabled = true;

    mEnv->CallStaticVoidMethod(mActivityInstance, midCreateGLContext ); 

}

extern "C" void Android_Render(){

    if(!bRenderingEnabled){

        return;

    }

    //When we get here, we've accumulated a full frame    

    mEnv->CallStaticVoidMethod(mActivityInstance, midFlipBuffers ); 

}

extern "C" void Android_EnableFeature(int featureid, bool enabled){

    mEnv->CallStaticVoidMethod(mActivityInstance, midEnableFeature, 

                                featureid, (int)enabled); 

}

extern "C" void Android_UpdateAudioBuffer(unsigned char *buf, int len){

    //Annoyingly we can't just call into Java from any thread. Because the audio

    //callback is dispatched from the SDL audio thread (that wasn't made from

    //java, we have to do some magic here to let the JVM know about the thread.

    //Because everything it touches on the Java side is static anyway, it's 

    //not a big deal, just annoying.

    if(!mAudioThreadEnv){

        __android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: Need to set up audio thread env\n");

        mVM->AttachCurrentThread(&mAudioThreadEnv, NULL);

        __android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: ok\n");

    }

    jbyteArray arr = mAudioThreadEnv->NewByteArray(len);

    //blah. We probably should rework this so we avoid the copy. 

    mAudioThreadEnv->SetByteArrayRegion(arr, 0, len, (jbyte *)buf);

    __android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: copied\n");

    mAudioThreadEnv->CallStaticVoidMethod(  mActivityInstance, 

                                            midUpdateAudio, arr );

    __android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: invoked\n");

}