/*
Minetest
Copyright (C) 2014 celeron55, Perttu Ahola <celeron55@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser 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.
*/

#ifndef __ANDROID__
#error This file may only be compiled for android!
#endif

#include "util/numeric.h"
#include "porting.h"
#include "porting_android.h"
#include "threading/thread.h"
#include "config.h"
#include "filesys.h"
#include "log.h"

#include <sstream>
#include <exception>
#include <stdlib.h>

#ifdef GPROF
#include "prof.h"
#endif

extern int main(int argc, char *argv[]);

void android_main(android_app *app)
{
	int retval = 0;
	porting::app_global = app;

	Thread::setName("Main");

	try {
		app_dummy();
		char *argv[] = {strdup(PROJECT_NAME), NULL};
		main(ARRLEN(argv) - 1, argv);
		free(argv[0]);
	} catch (std::exception &e) {
		errorstream << "Uncaught exception in main thread: " << e.what() << std::endl;
		retval = -1;
	} catch (...) {
		errorstream << "Uncaught exception in main thread!" << std::endl;
		retval = -1;
	}

	porting::cleanupAndroid();
	infostream << "Shutting down." << std::endl;
	exit(retval);
}

/* handler for finished message box input */
/* Intentionally NOT in namespace porting */
/* TODO this doesn't work as expected, no idea why but there's a workaround   */
/* for it right now */
extern "C" {
	JNIEXPORT void JNICALL Java_net_minetest_MtNativeActivity_putMessageBoxResult(
			JNIEnv * env, jclass thiz, jstring text)
	{
		errorstream << "Java_net_minetest_MtNativeActivity_putMessageBoxResult got: "
				<< std::string((const char*)env->GetStringChars(text,0))
				<< std::endl;
	}
}

namespace porting {

std::string path_storage = DIR_DELIM "sdcard" DIR_DELIM;

android_app* app_global;
JNIEnv*      jnienv;
jclass       nativeActivity;

jclass findClass(std::string classname)
{
	if (jnienv == 0) {
		return 0;
	}

	jclass nativeactivity = jnienv->FindClass("android/app/NativeActivity");
	jmethodID getClassLoader =
			jnienv->GetMethodID(nativeactivity,"getClassLoader",
					"()Ljava/lang/ClassLoader;");
	jobject cls =
			jnienv->CallObjectMethod(app_global->activity->clazz, getClassLoader);
	jclass classLoader = jnienv->FindClass("java/lang/ClassLoader");
	jmethodID findClass =
			jnienv->GetMethodID(classLoader, "loadClass",
					"(Ljava/lang/String;)Ljava/lang/Class;");
	jstring strClassName =
			jnienv->NewStringUTF(classname.c_str());
	return (jclass) jnienv->CallObjectMethod(cls, findClass, strClassName);
}

void copyAssets()
{
	jmethodID assetcopy = jnienv->GetMethodID(nativeActivity,"copyAssets","()V");

	if (assetcopy == 0) {
		assert("porting::copyAssets unable to find copy assets method" == 0);
	}

	jnienv->CallVoidMethod(app_global->activity->clazz, assetcopy);
}

void initAndroid()
{
	porting::jnienv = NULL;
	JavaVM *jvm = app_global->activity->vm;
	JavaVMAttachArgs lJavaVMAttachArgs;
	lJavaVMAttachArgs.version = JNI_VERSION_1_6;
	lJavaVMAttachArgs.name = PROJECT_NAME_C "NativeThread";
	lJavaVMAttachArgs.group = NULL;
#ifdef NDEBUG
	// This is a ugly hack as arm v7a non debuggable builds crash without this
	// printf ... if someone finds out why please fix it!
	infostream << "Attaching native thread. " << std::endl;
#endif
	if ( jvm->AttachCurrentThread(&porting::jnienv, &lJavaVMAttachArgs) == JNI_ERR) {
		errorstream << "Failed to attach native thread to jvm" << std::endl;
		exit(-1);
	}

	nativeActivity = findClass("net/minetest/minetest/MtNativeActivity");
	if (nativeActivity == 0) {
		errorstream <<
			"porting::initAndroid unable to find java native activity class" <<
			std::endl;
	}

#ifdef GPROF
	/* in the start-up code */
	__android_log_print(ANDROID_LOG_ERROR, PROJECT_NAME_C,
			"Initializing GPROF profiler");
	monstartup("libminetest.so");
#endif
}

void cleanupAndroid()
{

#ifdef GPROF
	errorstream << "Shutting down GPROF profiler" << std::endl;
	setenv("CPUPROFILE", (path_user + DIR_DELIM + "gmon.out").c_str(), 1);
	moncleanup();
#endif

	JavaVM *jvm = app_global->activity->vm;
	jvm->DetachCurrentThread();
}

void setExternalStorageDir(JNIEnv* lJNIEnv)
{
	// Android: Retrieve ablsolute path to external storage device (sdcard)
	jclass ClassEnv      = lJNIEnv->FindClass("android/os/Environment");
	jmethodID MethodDir  =
			lJNIEnv->GetStaticMethodID(ClassEnv,
					"getExternalStorageDirectory","()Ljava/io/File;");
	jobject ObjectFile   = lJNIEnv->CallStaticObjectMethod(ClassEnv, MethodDir);
	jclass ClassFile     = lJNIEnv->FindClass("java/io/File");

	jmethodID MethodPath =
			lJNIEnv->GetMethodID(ClassFile, "getAbsolutePath",
					"()Ljava/lang/String;");
	jstring StringPath   =
			(jstring) lJNIEnv->CallObjectMethod(ObjectFile, MethodPath);

	const char *externalPath = lJNIEnv->GetStringUTFChars(StringPath, NULL);