#include "SDL_system.h"  // TRY DONT USE THIS
#include <jni.h>
#include <android/asset_manager.h>
#include <android/asset_manager_jni.h>

// retrieve the JNI environment.
JNIEnv* jnienv = (JNIEnv*)SDL_AndroidGetJNIEnv();   // REPLACE THIS
int version = (*jnienv)->GetVersion(jnienv);
// SDL_Log("version %d\n", version);

// retrieve the Java instance of the SDLActivity
jobject activity = (jobject)SDL_AndroidGetActivity();  // REPLACE THIS

// find the Java class of the activity. It should be SDLActivity or a subclass of it.
jclass activityclass = (*jnienv)->GetObjectClass(jnienv, activity);    

/* context = SDLActivity.getContext(); */
jmethodID mid = (*jnienv)->GetStaticMethodID(jnienv, activityclass, "getContext","()Landroid/content/Context;");
jobject context = (*jnienv)->CallStaticObjectMethod(jnienv, activityclass, mid);
jclass contextclass = (*jnienv)->GetObjectClass(jnienv, context);

/* assetManager = context.getAssets(); */
mid = (*jnienv)->GetMethodID(jnienv, contextclass, "getAssets", "()Landroid/content/res/AssetManager;");
jobject assetmanager = (*jnienv)->CallObjectMethod(jnienv, context, mid);

// finally get AAssetManager instance
AAssetManager* mgr = AAssetManager_fromJava(jnienv, assetmanager);
if(!mgr)  ERROR("Fail to get AAssetManager\n");

AAsset* asset = AAssetManager_open(mgr, "game_easy.txt", AASSET_MODE_UNKNOWN);
if(!asset) ERROR("Fail to get file %s from Assets\n", "game_easy.txt");

/* AAsset_openFileDescriptor() only works with uncompressed files as mp3, png, ... */
// off_t start, length;
// int fd = AAsset_openFileDescriptor(asset, &start, &length);
// SDL_Log("fd = %d\n", fd);

/* Use either AAsset_read or AAsset_getBuffer. */

// copy all files on local storage */

AAssetDir* assetDir = AAssetManager_openDir(mgr, "");
const char* filename = (const char*)NULL;
while ((filename = AAssetDir_getNextFileName(assetDir)) != NULL) {
  AAsset* asset = AAssetManager_open(mgr, filename, AASSET_MODE_STREAMING);
  char buf[BUFSIZ];
  int nb_read = 0;
  FILE* out = fopen(filename, "w");
  while ((nb_read = AAsset_read(asset, buf, BUFSIZ)) > 0)
    fwrite(buf, nb_read, 1, out);
  fclose(out);
  AAsset_close(asset);
}
AAssetDir_close(assetDir);

    
// env->DeleteLocalRef(activity);
// env->DeleteLocalRef(activityclass);