/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

//BEGIN_INCLUDE(all)
#include <mutex>
#include <initializer_list>
#include <memory>
#include <jni.h>
#include <errno.h>
#include <cassert>
#include <EGL/egl.h>
#include <EGL/eglext.h>
#include <android/window.h>
#include <android/asset_manager_jni.h>
#include <sys/prctl.h>					// for prctl( PR_SET_NAME )
#include <unistd.h>

#include "pch.h"
#include "app.h"
#include "asset.h"
#include "keymap.h"
#include "main.h"
#include "com_omixlab_panopainter_MainActivity.h"

#ifdef __QUEST__
#include "oculus_vr.h"
#elif __FOCUS__
#include "wave_vr.h"
#endif

typedef void (*GLDEBUGPROC)(GLenum source,
    GLenum type,
    GLuint id,
    GLenum severity,
    GLsizei length,
    const GLchar* message,
    const void* userParam);

typedef void (*fnDebugMessageCallback)(GLDEBUGPROC callback, const void* userParam);

#define GL_DEBUG_SEVERITY_HIGH                              0x9146
#define GL_DEBUG_SEVERITY_MEDIUM                            0x9147
#define GL_DEBUG_SEVERITY_LOW                               0x9148
#define GL_DEBUG_SEVERITY_NOTIFICATION                      0x826B

#define GL_DEBUG_OUTPUT                                     0x92E0
#define GL_DEBUG_OUTPUT_SYNCHRONOUS                         0x8242

EGLDisplay g_display = EGL_NO_DISPLAY;
EGLContext g_context = EGL_NO_CONTEXT;
std::recursive_mutex mutex;
int mutex_count = 0;
struct engine g_engine;
thread_local JNIEnv* jni;

jint JNI_OnLoad(JavaVM* vm, void* /*reserved*/)
{
    LOG("JNI_OnLoad");
    return JNI_VERSION_1_6;
}

std::string utf8chr(int cp)
{
    char c[5]={ 0x00,0x00,0x00,0x00,0x00 };
    if     (cp<=0x7F) { c[0] = cp;  }
    else if(cp<=0x7FF) { c[0] = (cp>>6)+192; c[1] = (cp&63)+128; }
    else if(0xd800<=cp && cp<=0xdfff) {} //invalid block of utf8
    else if(cp<=0xFFFF) { c[0] = (cp>>12)+224; c[1]= ((cp>>6)&63)+128; c[2]=(cp&63)+128; }
    else if(cp<=0x10FFFF) { c[0] = (cp>>18)+240; c[1] = ((cp>>12)&63)+128; c[2] = ((cp>>6)&63)+128; c[3]=(cp&63)+128; }
    return std::string(c);
}

// see https://stackoverflow.com/questions/21124051/receive-complete-android-unicode-input-in-c-c
// see http://www.zedwood.com/article/cpp-utf8-char-to-codepoint
int GetUnicodeChar(int eventType, int keyCode, int metaState)
{
#define COMBINING_ACCENT 0x80000000
#define COMBINING_ACCENT_MASK 0x7fffffff

    jclass class_key_event = jni->FindClass("android/view/KeyEvent");
    int unicodeKey;

    if(metaState == 0)
    {
        jmethodID method_get_unicode_char = jni->GetMethodID(class_key_event, "getUnicodeChar", "()I");
        jmethodID eventConstructor = jni->GetMethodID(class_key_event, "<init>", "(II)V");
        jobject eventObj = jni->NewObject(class_key_event, eventConstructor, eventType, keyCode);

        unicodeKey = jni->CallIntMethod(eventObj, method_get_unicode_char);
    }

    else
    {
        jmethodID method_get_unicode_char = jni->GetMethodID(class_key_event, "getUnicodeChar", "(I)I");
        jmethodID eventConstructor = jni->GetMethodID(class_key_event, "<init>", "(II)V");
        jobject eventObj = jni->NewObject(class_key_event, eventConstructor, eventType, keyCode);

        unicodeKey = jni->CallIntMethod(eventObj, method_get_unicode_char, metaState);
    }

    if ((unicodeKey & COMBINING_ACCENT) != 0)
    {
        unicodeKey = unicodeKey & COMBINING_ACCENT_MASK;
    }

    LOG("Unicode key is: %d", unicodeKey);
    return unicodeKey;
}

void android_attach_jni()
{
    g_engine.app->activity->vm->AttachCurrentThread(&jni, nullptr);
}

void android_detach_jni()
{
    g_engine.app->activity->vm->DetachCurrentThread();
}

void android_async_lock()
{
    mutex.lock();
    if (mutex_count == 0)
        eglMakeCurrent(g_engine.display, g_engine.surface, g_engine.surface, g_engine.context);
    mutex_count++;
}

bool android_async_trylock()
{
    if (!mutex.try_lock())
        return false;
    if (mutex_count == 0)
        eglMakeCurrent(g_engine.display, g_engine.surface, g_engine.surface, g_engine.context);
    mutex_count++;
    return true;
}

void android_async_swap()
{
    eglSwapBuffers(g_engine.display, g_engine.surface);
}

void android_async_unlock()
{
    mutex_count--;
    if (mutex_count == 0)
        eglMakeCurrent(g_engine.display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
    mutex.unlock();
}

// see https://groups.google.com/forum/#!topic/android-ndk/Tk3g00wLKhk
void displayKeyboard(bool pShow)
{
    // Retrieves NativeActivity.
    jobject lNativeActivity = g_engine.app->activity->clazz;
    jclass ClassNativeActivity = jni->GetObjectClass(lNativeActivity);

    // Retrieves Context.INPUT_METHOD_SERVICE.
    jclass ClassContext = jni->FindClass("android/content/Context");
    jfieldID FieldINPUT_METHOD_SERVICE =
            jni->GetStaticFieldID(ClassContext, "INPUT_METHOD_SERVICE", "Ljava/lang/String;");
    jobject INPUT_METHOD_SERVICE =
            jni->GetStaticObjectField(ClassContext,
                                          FieldINPUT_METHOD_SERVICE);
    //jniCheck(INPUT_METHOD_SERVICE);

    // Runs getSystemService(Context.INPUT_METHOD_SERVICE).
    jclass ClassInputMethodManager = jni->FindClass(
            "android/view/inputmethod/InputMethodManager");
    jmethodID MethodGetSystemService = jni->GetMethodID(
            ClassNativeActivity, "getSystemService",
            "(Ljava/lang/String;)Ljava/lang/Object;");
    jobject lInputMethodManager = jni->CallObjectMethod(
            lNativeActivity, MethodGetSystemService,
            INPUT_METHOD_SERVICE);

    // Runs getWindow().getDecorView().
    jmethodID MethodGetWindow = jni->GetMethodID(
            ClassNativeActivity, "getWindow",
            "()Landroid/view/Window;");
    jobject lWindow = jni->CallObjectMethod(lNativeActivity,
                                                MethodGetWindow);
    jclass ClassWindow = jni->FindClass(
            "android/view/Window");
    jmethodID MethodGetDecorView = jni->GetMethodID(
            ClassWindow, "getDecorView", "()Landroid/view/View;");
    jobject lDecorView = jni->CallObjectMethod(lWindow,
                                                   MethodGetDecorView);

    if (pShow) {
        // Runs lInputMethodManager.showSoftInput(...).
        jmethodID MethodShowSoftInput = jni->GetMethodID(
                ClassInputMethodManager, "showSoftInput",
                "(Landroid/view/View;I)Z");
        jboolean lResult = jni->CallBooleanMethod(
                lInputMethodManager, MethodShowSoftInput,
                lDecorView, 0);
    } else {
        // Runs lWindow.getViewToken()
        jclass ClassView = jni->FindClass(
                "android/view/View");
        jmethodID MethodGetWindowToken = jni->GetMethodID(
                ClassView, "getWindowToken", "()Landroid/os/IBinder;");
        jobject lBinder = jni->CallObjectMethod(lDecorView,
                                                    MethodGetWindowToken);

        // lInputMethodManager.hideSoftInput(...).
        jmethodID MethodHideSoftInput = jni->GetMethodID(
                ClassInputMethodManager, "hideSoftInputFromWindow",
                "(Landroid/os/IBinder;I)Z");
        jboolean lRes = jni->CallBooleanMethod(
                lInputMethodManager, MethodHideSoftInput,
                lBinder, 0);
    }
}

/*
 * Class:     com_omixlab_panopainter_MainActivity
 * Method:    pickFileCallback
 * Signature: (Ljava/lang/String;)V
 */
std::function<void(std::string)> pick_file_callback;
std::function<void()> pick_file_callback_context;
extern "C"
{
#ifdef __FOCUS__
JNIEXPORT void JNICALL Java_com_omixlab_panopainter_MainActivity_init_vr(JNIEnv *env, jobject activity, jobject am)
{
    Asset::m_am = AAssetManager_fromJava(env, am);
    wave_init(0, 0, 0);
}
#endif
JNIEXPORT void JNICALL Java_com_omixlab_panopainter_MainActivity_pickFileCallback(JNIEnv *env, jobject, jstring path)
{
    const char* path_utf = env->GetStringUTFChars(path, nullptr);
    std::string file_path = path_utf; // create a copy
    env->ReleaseStringUTFChars(path, path_utf);

    LOG("received %s", file_path.c_str());
    pick_file_callback_context = [file_path]
    {
        if (pick_file_callback)
        {
            LOG("callback");
            pick_file_callback(file_path);
            pick_file_callback = nullptr;
        }
    };
}
JNIEXPORT void JNICALL Java_com_omixlab_panopainter_MainActivity_pickExternalCallback(JNIEnv *env, jobject, jstring path)
{
    const char* path_utf = env->GetStringUTFChars(path, nullptr);
    std::string file_path = path_utf; // create a copy
    env->ReleaseStringUTFChars(path, path_utf);

    LOG("data_path %s", file_path.c_str());
    App::I->data_path = file_path;
    App::I->work_path = file_path;
    App::I->rec_path = file_path + "/frames";

    App::I->initLog();
}
JNIEXPORT void JNICALL Java_com_omixlab_panopainter_MainActivity_contentRectChanged(JNIEnv *end, jobject,
        jint wnd_w, jint wnd_h, jint rect_left, jint rect_top, jint rect_right, jint rect_bottom)
{
#ifndef __QUEST__
    LOG("resize wnd [%d %d] rect [%d %d %d %d]", wnd_w, wnd_h, rect_left, rect_top, rect_right, rect_bottom);
    App::I->width = wnd_w;
    App::I->height = (rect_bottom - rect_top);
    App::I->off_x = 0;
    App::I->off_y = wnd_h - (rect_bottom - rect_top);
#endif
}
}

void android_pick_file(std::function<void(std::string)> callback)
{
    pick_file_callback = callback;
    jclass clazz = jni->GetObjectClass(g_engine.app->activity->clazz);
    jmethodID method = jni->GetMethodID(clazz, "pickFile", "()V");
    jni->CallVoidMethod(g_engine.app->activity->clazz, method);
}

float get_display_density()
{
    jclass clazz = jni->GetObjectClass(g_engine.app->activity->clazz);
    jmethodID method = jni->GetMethodID(clazz, "getDensity", "()F");
    return jni->CallFloatMethod(g_engine.app->activity->clazz, method);
}

std::string get_data_path()
{
    jclass clazz = jni->GetObjectClass(g_engine.app->activity->clazz);
    jmethodID method = jni->GetMethodID(clazz, "getDataPath", "()Ljava/lang/String;");
    jstring js = (jstring)jni->CallObjectMethod(g_engine.app->activity->clazz, method);

    const char* utf = jni->GetStringUTFChars(js, nullptr);
    std::string str = utf; // create a copy
    jni->ReleaseStringUTFChars(js, utf);
    return str;
}

// source: https://github.com/opencollab/giws/issues/4
jstring JniStringFromUTF8(const std::string& s)
{
    int len = s.size();
    jbyteArray bytes = jni->NewByteArray(len);
    if (bytes == 0)
    {
        LOG("jni->NewByteArray failed");
        return 0;
    }

    jni->SetByteArrayRegion(bytes, 0, len, (jbyte *)s.c_str());

    jclass string_class = jni->FindClass("java/lang/String");
    jmethodID stringConstructor = jni->GetMethodID(string_class, "<init>", "([B)V" );
    if (stringConstructor == NULL)
    {
        LOG("JniStringFromUTF8 new String(byte[]) failed");
        jni->DeleteLocalRef(bytes);
        return 0;
    }

    jstring result = (jstring)jni->NewObject(string_class, stringConstructor, bytes);
    jni->DeleteLocalRef(bytes);

    return result; //NOTE: jstring must be freed using: curEnv->DeleteLocalRef(result);
}

std::string android_get_clipboard()
{
    jclass clazz = jni->GetObjectClass(g_engine.app->activity->clazz);
    jmethodID method = jni->GetMethodID(clazz, "getClipboardText", "()Ljava/lang/String;");
    jstring js = (jstring)jni->CallObjectMethod(g_engine.app->activity->clazz, method);

    const char* utf = jni->GetStringUTFChars(js, nullptr);
    std::string str = utf; // create a copy
    jni->ReleaseStringUTFChars(js, utf);
    return str;
}

bool android_set_clipboard(const std::string& s)
{
    jclass clazz = jni->GetObjectClass(g_engine.app->activity->clazz);
    jmethodID method = jni->GetMethodID(clazz, "setClipboardText", "(Ljava/lang/String;)Z");
    jstring js = JniStringFromUTF8(s);
    if (!js) return false;
    jboolean success = jni->CallBooleanMethod(g_engine.app->activity->clazz, method, js);
    jni->DeleteLocalRef(js);
    return success;
}

bool vr_running = false;
static void engine_vr_loop()
{
    LOG("start hmd render thread");
    vr_running = true;
    App::I->ui_sync();
    while (vr_running)
    {
#ifdef __QUEST__
        App::I->render_task([] {
            App::I->vr_draw_ui();
            oculus_draw(0);
        });
#endif
    }
    LOG("hmd renderer terminated");
}

static void engine_start_vr_thread()
{
    std::thread(engine_vr_loop).detach();
}

static void engine_start_vr_mode()
{
#ifdef __QUEST__
    LOG("QUEST init VR");
    oculus_init_vr(g_engine.display, g_engine.context, g_engine.app->window);
#elif __FOCUS__
    wave_init_vr(g_engine.display, g_engine.context, g_engine.app->window);
#endif
}

/**
 * Initialize an EGL context for the current display.
 */
static int engine_init_display(struct engine* engine) {
    // initialize OpenGL ES and EGL

    /*
     * Here specify the attributes of the desired configuration.
     * Below, we select an EGLConfig with at least 8 bits per color
     * component compatible with on-screen windows
     */
#ifdef __QUEST__
    EGLint egl_depth = 0;
    EGLint egl_alpha = 8;
    const EGLint attribs[] = {
            EGL_RENDERABLE_TYPE, EGL_OPENGL_ES3_BIT_KHR,
            EGL_SURFACE_TYPE, EGL_WINDOW_BIT | EGL_PBUFFER_BIT,
            EGL_BLUE_SIZE, 8,
            EGL_GREEN_SIZE, 8,
            EGL_RED_SIZE, 8,
            EGL_ALPHA_SIZE, 8,
            EGL_DEPTH_SIZE, 0,
            EGL_STENCIL_SIZE, 0,
            EGL_SAMPLES, 0,
            EGL_NONE
    };
#else
    EGLint egl_depth = 24;
    EGLint egl_alpha = 0;
    const EGLint attribs[] = {
            EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
            EGL_BLUE_SIZE, 8,
            EGL_GREEN_SIZE, 8,
            EGL_RED_SIZE, 8,
            EGL_DEPTH_SIZE, 24,
            EGL_STENCIL_SIZE, 0,
            EGL_SAMPLES, 0,
            EGL_NONE
    };
#endif
    EGLint w, h, format;
    EGLint numConfigs;
    EGLConfig config = nullptr;
    EGLSurface surface = nullptr;
    EGLContext context = nullptr;

    EGLDisplay display = g_display;
    if (g_display == EGL_NO_DISPLAY)
    {
        LOG("DYSPLAY CREATE");
        display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
        eglInitialize(display, nullptr, nullptr);
    }
    else LOG("DISPLAY RESUME");

    /* Here, the application chooses the configuration it desires.
     * find the best match if possible, otherwise use the very first one
     */
    eglChooseConfig(display, attribs, nullptr,0, &numConfigs);
    std::unique_ptr<EGLConfig[]> supportedConfigs(new EGLConfig[numConfigs]);
    assert(supportedConfigs);
    eglChooseConfig(display, attribs, supportedConfigs.get(), numConfigs, &numConfigs);
    assert(numConfigs);
    auto i = 0;
    for (; i < numConfigs; i++) {
        auto& cfg = supportedConfigs[i];
        EGLint r, g, b, a, d;
        if (eglGetConfigAttrib(display, cfg, EGL_RED_SIZE, &r)   &&
            eglGetConfigAttrib(display, cfg, EGL_GREEN_SIZE, &g) &&
            eglGetConfigAttrib(display, cfg, EGL_BLUE_SIZE, &b)  &&
            eglGetConfigAttrib(display, cfg, EGL_ALPHA_SIZE, &a)  &&
            eglGetConfigAttrib(display, cfg, EGL_DEPTH_SIZE, &d) &&
            r == 8 && g == 8 && b == 8 && a == egl_alpha && d == egl_depth ) {

            config = supportedConfigs[i];
            break;
        }
    }
    if (i == numConfigs) {
        config = supportedConfigs[0];
    }

    /* EGL_NATIVE_VISUAL_ID is an attribute of the EGLConfig that is
     * guaranteed to be accepted by ANativeWindow_setBuffersGeometry().
     * As soon as we picked a EGLConfig, we can safely reconfigure the
     * ANativeWindow buffers to match, using EGL_NATIVE_VISUAL_ID. */
    eglGetConfigAttrib(display, config, EGL_NATIVE_VISUAL_ID, &format);
    surface = eglCreateWindowSurface(display, config, engine->app->window, nullptr);

#ifdef __QUEST__
    const int gles_version = 3;
#else
    const int gles_version = 2;
#endif

    const EGLint attribs_test[] = {
        EGL_CONTEXT_CLIENT_VERSION, gles_version,
        EGL_CONTEXT_FLAGS_KHR, EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR | EGL_CONTEXT_OPENGL_FORWARD_COMPATIBLE_BIT_KHR,
        EGL_CONTEXT_OPENGL_PROFILE_MASK_KHR, EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT_KHR,
        EGL_NONE
    };

    bool resuming_context = true;
    context = g_context;
    if (g_context == EGL_NO_CONTEXT)
    {
        LOG("CONTEXT CREATE");
        context = eglCreateContext(display, config, EGL_NO_CONTEXT, attribs_test);
        resuming_context = false;
    }
    else LOG("CONTEXT RESUME");

    if (context == EGL_NO_CONTEXT)
    {
        LOG("EGL: debug and forward context failed");
        const EGLint attribs_test[] = {
            EGL_CONTEXT_CLIENT_VERSION, gles_version,
            EGL_CONTEXT_FLAGS_KHR, EGL_CONTEXT_OPENGL_FORWARD_COMPATIBLE_BIT_KHR,
            EGL_NONE
        };
        context = eglCreateContext(display, config, EGL_NO_CONTEXT, attribs_test);
        if (context == EGL_NO_CONTEXT)
        {
            LOG("EGL: only forward context failed");
            const EGLint attribs_test[] = {
                EGL_CONTEXT_CLIENT_VERSION, gles_version,
                EGL_CONTEXT_FLAGS_KHR, EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR,
                //EGL_CONTEXT_OPENGL_PROFILE_MASK_KHR, EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT_KHR,
                EGL_NONE
            };
            context = eglCreateContext(display, config, EGL_NO_CONTEXT, attribs_test);
            if (context == EGL_NO_CONTEXT)
            {
                LOG("EGL: only debug context failed");
                const EGLint attribs_test[] = {
                    EGL_CONTEXT_CLIENT_VERSION, gles_version,
                    EGL_NONE
                };
                context = eglCreateContext(display, config, EGL_NO_CONTEXT, attribs_test);
                if (context == EGL_NO_CONTEXT)
                {
                    LOG("EGL: all the context creation failed");
                }
                else
                {
                    LOG("EGL: created simple context");
                }
            }
            else
            {
                LOG("EGL: created only debug context");
            }
        }
        else
        {
            LOG("EGL: created only forward context");
        }
    }
    else
    {
        LOG("EGL: created debug and forward context");
    }

    if (eglMakeCurrent(display, surface, surface, context) == EGL_FALSE) {
        LOG("Unable to eglMakeCurrent");
        return -1;
    }

    eglQuerySurface(display, surface, EGL_WIDTH, &w);
    eglQuerySurface(display, surface, EGL_HEIGHT, &h);

    engine->display = display;
    engine->context = context;
    engine->surface = surface;
    engine->width = w;
    engine->height = h;
    engine->state.angle = 0;

    g_display = display;
    g_context = context;

    if (resuming_context)
    {
        LOG("RESUME APP");
        App::I->and_app = engine->app;
        LOG("release egl context");
        eglMakeCurrent(engine->display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
        mutex.unlock();
        engine_start_vr_mode();
        return 0;
    }

    // Check openGL on the system
    auto opengl_info = { GL_VENDOR, GL_RENDERER, GL_VERSION/*, GL_EXTENSIONS*/ };
    for (auto name : opengl_info) {
        auto info = glGetString(name);
        LOG("OpenGL Info: %s", info);
    }

    GLint n_exts;
    std::map<std::string, bool> ext_map;
    glGetIntegerv(GL_NUM_EXTENSIONS, &n_exts);
    for (int i = 0; i < n_exts; i++)
    {
        ext_map.emplace((char*)glGetStringi(GL_EXTENSIONS, i), true);
    }

    //const char* ext = (const char*) glGetString(GL_EXTENSIONS);
    //int ext_len = strlen(ext);
    //static char ext_name[256];
    //int ext_name_i = 0;
    //for (int i = 0; i < ext_len; i++)
    //{
    //    char c = ext[i];
    //    if (c == ' ')
    //    {
    //        ext_map.emplace(std::string(ext_name, ext_name_i), true);
    //        ext_name_i = 0;
    //    }
    //    else
    //    {
    //        ext_name[ext_name_i++] = c;
    //    }
    //}

    if (ext_map.count("GL_KHR_debug"))
    {
        LOG("GL_KHR_debug supported");
        auto glDebugMessageCallback = (fnDebugMessageCallback)eglGetProcAddress("glDebugMessageCallbackKHR");
        if (glDebugMessageCallback)
        {
            LOG("glDebugMessageCallback proc found at %p", glDebugMessageCallback);
            glDebugMessageCallback([](GLenum source, GLenum type, GLuint id,
                GLenum severity, GLsizei length, const GLchar* message, const void* userParam)
            {
                //if (severity == GL_DEBUG_SEVERITY_MEDIUM || severity == GL_DEBUG_SEVERITY_HIGH)
                {
                    LOG("OPENGL: %.*s", length, message);
                }
            }, nullptr);
            glEnable(GL_DEBUG_OUTPUT);
            glEnable(GL_DEBUG_OUTPUT_SYNCHRONOUS);
        }
        else
        {
            LOG("glDebugMessageCallback proc NOT FOUND");
        }
    }

    FILE* file = popen("getprop", "r");
    std::map<std::string, std::string> os_props;
    if (file)
    {
        char output[100];
        while (fgets(output, sizeof(output), file) != nullptr)
        {
            int i = 0;
            int l = strlen(output);
            char buf[64];
            int j = 0;
            while (i < l && output[i] != '[') i++;
            i++;
            while (i < l && output[i] != ']') { buf[j++] = output[i]; i++; }
            std::string key(buf, j);
            j = 0;
            while (i < l && output[i] != '[') i++;
            i++;
            while (i < l && output[i] != ']') { buf[j++] = output[i]; i++; }
            os_props[key] = std::string(buf, j);
            //LOG("PROP: %s -> %s", key.c_str(), os_props[key].c_str());
        }
        pclose(file);
    }
    LOG("PROP Android Version: %s", os_props["ro.build.version.release"].c_str());
    LOG("PROP Android SDK: %s", os_props["ro.build.version.sdk"].c_str());
    LOG("PROP Country Code: %s", os_props["ro.csc.country_code"].c_str());
    LOG("PROP ABI: %s", os_props["ro.product.cpu.abilist"].c_str());
    LOG("PROP Brand: %s", os_props["ro.product.brand"].c_str());
    LOG("PROP Maker: %s", os_props["ro.product.manufacturer"].c_str());
    LOG("PROP Mode: %s", os_props["ro.product.model"].c_str());

    Asset::m_am = engine->app->activity->assetManager;
    App::I->and_app = engine->app;
    App::I->and_engine = engine;

    //std::string base_path = engine->app->activity->externalDataPath ?
    //    engine->app->activity->externalDataPath : get_data_path(engine->app);
    if (App::I->data_path.empty() || App::I->data_path == ".")
        App::I->data_path = get_data_path();
    LOG("data_path %s", App::I->data_path.c_str());


#ifdef __QUEST__
    App::I->zoom = 1.f;
    App::I->width = 1024;
    App::I->height = 1024;
    App::I->redraw = true;
    App::I->vr_active = true;
    App::I->has_vr = true;
    App::I->vr_only = true;

    // give control to the render thread
    LOG("release egl context");
    eglMakeCurrent(engine->display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);

    LOG("start render threads");
    App::I->render_thread_start();

    LOG("start ui thread");
    App::I->ui_thread_start();

    LOG("start vr thread");
    engine_start_vr_mode();
    engine_start_vr_thread();
#else
    float density = get_display_density();
    LOG("density %f", density);
    App::I->zoom = density / 1.5;
    App::I->width = w;
    App::I->height = h;
    App::I->redraw = true;

    // give control to the render thread
    LOG("release egl context");
    eglMakeCurrent(engine->display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);

    LOG("start render threads");
    App::I->render_thread_start();
    LOG("start ui thread");
    App::I->ui_thread_start();
#endif
    return 0;
}

/**
 * Tear down the EGL context currently associated with the display.
 */
static void engine_term_display(struct engine* engine) {
    LOG("flush render thread");
    App::I->render_sync();
    mutex.lock();
    if (engine->display != EGL_NO_DISPLAY) {
        eglMakeCurrent(engine->display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
//        if (engine->context != EGL_NO_CONTEXT) {
//            eglDestroyContext(engine->display, engine->context);
//        }
        if (engine->surface != EGL_NO_SURFACE) {
            eglDestroySurface(engine->display, engine->surface);
        }
//        eglTerminate(engine->display);
    }
    engine->animating = 0;
    engine->display = EGL_NO_DISPLAY;
    engine->context = EGL_NO_CONTEXT;
    engine->surface = EGL_NO_SURFACE;
#ifdef __QUEST__
    oculus_release_vr();
#endif
}

/**
 * Process the next input event.
 */
static int32_t engine_handle_input(struct android_app* app, AInputEvent* event) {
    struct engine* engine = (struct engine*)app->userData;
    int32_t eventType = AInputEvent_getType(event);
    //LOG("event type: %d", eventType);

    //locker _locker{engine};
    App::I->redraw = true;

    switch (eventType) {
    case AINPUT_EVENT_TYPE_MOTION:
//         switch (AInputEvent_getSource(event)) {
//         case AINPUT_SOURCE_STYLUS:
//         case AINPUT_SOURCE_TOUCHSCREEN:
    {
        int action = AKeyEvent_getAction(event) & AMOTION_EVENT_ACTION_MASK;
        int32_t index = (action & AMOTION_EVENT_ACTION_POINTER_INDEX_MASK)
                        >> AMOTION_EVENT_ACTION_POINTER_INDEX_SHIFT;
        int pointer_id = AMotionEvent_getPointerId(event, index);
        int32_t count = AMotionEvent_getPointerCount(event);
        auto findPointer = [](int id, AInputEvent* event)
        {
            int32_t count = AMotionEvent_getPointerCount(event);
            int ret = -1;
            for (int i = 0; i < count; i++)
            {
                //LOG("pointer %d id %d == %d", i, id, AMotionEvent_getPointerId(event, i));
                if (AMotionEvent_getPointerId(event, i) == id)
                    ret = i;
            }
            return ret;
            return -1;
        };
        struct Pointer
        {
            int id = -1;
            int idx;
            glm::vec2 pos;
        };
        static Pointer p0, p1;
        static int tracked = 0;
        //LOG("event source: %d", AInputEvent_getSource(event));
        //LOG("pointer id %d count %d", pointer_id, count);
        MouseEvent e;
        switch (action) {
        case AMOTION_EVENT_ACTION_DOWN:
        {
            float x = AMotionEvent_getX(event, 0);
            float y = AMotionEvent_getY(event, 0);
            p0.id = AMotionEvent_getPointerId(event, 0);
            p0.pos = {x, y};
            p0.idx = index;
            int tool_type = AMotionEvent_getToolType(event, index);
            float pressure = AMotionEvent_getPressure(event, 0);
            kEventSource source = tool_type == AMOTION_EVENT_TOOL_TYPE_STYLUS ?
                kEventSource::Stylus : kEventSource::Touch;
            App::I->ui_task_async([=]{
                App::I->mouse_down(0, x, y, pressure, source, 0);
            });
            tracked = 1;
            //LOG("first down");
            return 1;
        }
        case AMOTION_EVENT_ACTION_POINTER_DOWN:
        {
            //LOG("pointer down index %d", index);
            if (count == 2)
            {
                float x = AMotionEvent_getX(event, 1);
                float y = AMotionEvent_getY(event, 1);
                p1.id = AMotionEvent_getPointerId(event, 1);
                p1.idx = index;
                p1.pos = {x, y};
                p0.pos.x = AMotionEvent_getX(event, 0);
                p0.pos.y = AMotionEvent_getY(event, 0);
                //LOG("second down");
                App::I->ui_task_async([t=tracked, _p0=p0, _p1=p1] {
                    if (t == 1)
                        App::I->mouse_cancel(0);
                    App::I->gesture_start(_p0.pos, _p1.pos);
                });
                tracked = 2;
            }
            return 1;
        }
        case AMOTION_EVENT_ACTION_UP:
        {
            float y = AMotionEvent_getY(event, 0);
            float x = AMotionEvent_getX(event, 0);
            p0.id = -1;
            p1.id = -1;
            int tool_type = AMotionEvent_getToolType(event, index);
            float pressure = AMotionEvent_getPressure(event, 0);
            kEventSource source = tool_type == AMOTION_EVENT_TOOL_TYPE_STYLUS ?
                  kEventSource::Stylus : kEventSource::Touch;
            if (tracked == 1)
            {
                App::I->ui_task_async([=] {
                    App::I->mouse_up(0, x, y, source, 0);
                });
            }
            tracked = 0;
            //LOG("first up");
            return 1;
        }
        case AMOTION_EVENT_ACTION_POINTER_UP:
            if (p1.id == AMotionEvent_getPointerId(event, 1))
            {
                p1.id = -1;
                //LOG("second up");
                App::I->ui_task_async([=] {
                    App::I->gesture_end();
                });
            }
            return 1;
        case AMOTION_EVENT_ACTION_HOVER_MOVE: // pen move before touching
        {
            float y = AMotionEvent_getY(event, 0);
            float x = AMotionEvent_getX(event, 0);
            App::I->ui_task_async([=] {
                App::I->mouse_move(x, y, 0, kEventSource::Stylus, 0);
            });
            //LOG("single move");
            return 1;
        }
        case AMOTION_EVENT_ACTION_MOVE:
            if (count == 1 && tracked == 1)
            {
                float y = AMotionEvent_getY(event, 0);
                float x = AMotionEvent_getX(event, 0);
                int tool_type = AMotionEvent_getToolType(event, index);
                float pressure = AMotionEvent_getPressure(event, 0);
                kEventSource source = tool_type == AMOTION_EVENT_TOOL_TYPE_STYLUS ?
                                      kEventSource::Stylus : kEventSource::Touch;
                App::I->ui_task_async([=] {
                    App::I->mouse_move(x, y, pressure, source, 0);
                });
                //LOG("single move");
            }
            else if (count == 2)
            {
                int idx = findPointer(pointer_id, event);
                //LOG("pointer move index %d", idx);
                if (p0.idx == idx)
                {
                    //LOG("first move");
                    float y = AMotionEvent_getY(event, 0);
                    float x = AMotionEvent_getX(event, 0);
                    p0.pos = {x, y};
                }
                if (p1.idx == idx)
                {
                    //LOG("second move");
                    float x = AMotionEvent_getX(event, 1);
                    float y = AMotionEvent_getY(event, 1);
                    p1.pos = {x, y};
                }
                App::I->ui_task_async([_p0=p0, _p1=p1] {
                    App::I->gesture_move(_p0.pos, _p1.pos);
                });
            }
            return 1;
        default:
            //LOG("motion action: %d", action);
            break;
        }
    }
//             break;
//         } // end switch
        break;
    case AINPUT_EVENT_TYPE_KEY:
    {
        int action = AKeyEvent_getAction(event);
        int32_t key_val = AKeyEvent_getKeyCode(event);
        int key = AKeyEvent_getKeyCode(event);
        int metaState = AKeyEvent_getMetaState(event);
        int uniValue = GetUnicodeChar(action, key, metaState);
        switch (action)
        {
            case AKEY_EVENT_ACTION_MULTIPLE:
                LOG("Received key multi event: %d\n", key_val);
                if (uniValue > 32 && uniValue < 127) //printable ascii range
                    App::I->ui_task_async([=] {
                        App::I->key_char(uniValue);
                    });
                break;
            case AKEY_EVENT_ACTION_DOWN:
                LOG("Received key down event: %d\n", key_val);
                App::I->ui_task_async([=] {
                    App::I->key_down(convert_key(key_val));
                });
                break;
            case AKEY_EVENT_ACTION_UP:
                LOG("Received key up event: %d\n", key_val);
                App::I->ui_task_async([=] {
                    App::I->key_up(convert_key(key_val));
                    if (uniValue > 32 && uniValue < 127) //printable ascii range
                        App::I->key_char(uniValue);
                });
                break;
        }
        return 1;
    }
    } // end switch
    return 0;
}

/**
 * Process the next main command.
 */
static void engine_handle_cmd(struct android_app* app, int32_t cmd) {
    struct engine* engine = (struct engine*)app->userData;
    switch (cmd) {
        case APP_CMD_RESUME:
            LOG("APP_CMD_RESUME");
            App::I->redraw = true;
            ALooper_wake(engine->app->looper);
            break;
        case APP_CMD_SAVE_STATE:
            // The system has asked us to save our current state.  Do so.
            engine->app->savedState = malloc(sizeof(struct saved_state));
            *((struct saved_state*)engine->app->savedState) = engine->state;
            engine->app->savedStateSize = sizeof(struct saved_state);
            LOG("SAVE STATE");
            break;
        case APP_CMD_INIT_WINDOW:
            // The window is being shown, get it ready.
            if (engine->app->window != NULL)
                engine_init_display(engine);
            break;
        case APP_CMD_TERM_WINDOW:
            // The window is being hidden or closed, clean it up.
            //App::I->terminate();
            engine_term_display(engine);
            //exit(0);
            break;
        case APP_CMD_GAINED_FOCUS:
            /*
            // When our app gains focus, we start monitoring the accelerometer.
            if (engine->accelerometerSensor != NULL) {
                ASensorEventQueue_enableSensor(engine->sensorEventQueue,
                                               engine->accelerometerSensor);
                // We'd like to get 60 events per second (in us).
                ASensorEventQueue_setEventRate(engine->sensorEventQueue,
                                               engine->accelerometerSensor,
                                               (1000L/60)*1000);
            }
            engine->animating = 1;
            */
            break;
        case APP_CMD_LOST_FOCUS:
            /*
            // When our app loses focus, we stop monitoring the accelerometer.
            // This is to avoid consuming battery while not being used.
            if (engine->accelerometerSensor != NULL) {
                ASensorEventQueue_disableSensor(engine->sensorEventQueue,
                                                engine->accelerometerSensor);
            }
            // Also stop animating.
            engine->animating = 0;
            */
            break;
        case APP_CMD_WINDOW_REDRAW_NEEDED:
            LOG("APP_CMD_WINDOW_REDRAW_NEEDED");
            App::I->redraw = true;
            ALooper_wake(engine->app->looper);
            break;
        case APP_CMD_WINDOW_RESIZED:
            LOG("APP_CMD_WINDOW_RESIZED");
            App::I->redraw = true;
            ALooper_wake(engine->app->looper);
            break;
        case APP_CMD_CONTENT_RECT_CHANGED:
            LOG("APP_CMD_CONTENT_RECT_CHANGED");
            //App::I->width = engine->app->contentRect.right - engine->app->contentRect.left;
            //App::I->height = engine->app->contentRect.bottom - engine->app->contentRect.top;
            //LOG("content rect %f %f", App::I->width, App::I->height);
            App::I->redraw = true;
            ALooper_wake(engine->app->looper);
            break;
    }
}

/**
 * This is the main entry point of a native application that is using
 * android_native_app_glue.  It runs in its own thread, with its own
 * event loop for receiving input events and doing other things.
 */
void android_main(struct android_app* state) {
    // Make sure glue isn't stripped.
    // DON'T REMOVE, even if the compiler say it's deprecated
    app_dummy();

    App::I = new App;

    memset(&g_engine, 0, sizeof(g_engine));
    state->userData = &g_engine;
    state->onAppCmd = engine_handle_cmd;
    state->onInputEvent = engine_handle_input;
    g_engine.app = state;

    // BEGIN OVR

    ANativeActivity_setWindowFlags(state->activity, AWINDOW_FLAG_KEEP_SCREEN_ON, 0 );

    state->activity->vm->AttachCurrentThread(&jni, nullptr);

#ifdef __QUEST__
    oculus_init(state->activity->vm, jni, state->activity->clazz);
#elif __FOCUS__
    wave_init(state->activity->vm, jni, state->activity->clazz);
#endif

    // Note that AttachCurrentThread will reset the thread name.
    prctl(PR_SET_NAME, (long)"PP Main", 0, 0, 0);

    // Prepare to monitor accelerometer
/*
    g_engine.sensorManager = ASensorManager_getInstance();
    g_engine.accelerometerSensor = ASensorManager_getDefaultSensor(
            g_engine.sensorManager, ASENSOR_TYPE_ACCELEROMETER);
    g_engine.sensorEventQueue = ASensorManager_createEventQueue(
            g_engine.sensorManager, state->looper, LOOPER_ID_USER, NULL, NULL);
*/
    LOG("START MAIN");
    if (state->savedState != NULL) {
        // We are starting with a previous saved state; restore from it.
        g_engine.state = *(struct saved_state*)state->savedState;
    }

    //App::I->create();
    App::I->redraw = true;

    // loop waiting for stuff to do.

    while (1) {
        // Read all pending events.
        int ident;
        int events;
        struct android_poll_source* source;

        // If not animating, we will block forever waiting for events.
        // If animating, we loop until all events are read, then continue
        // to draw the next frame of animation.
        bool used = false;
        int timeout = g_engine.display != EGL_NO_DISPLAY ? 0 : -1;
        while (!used && (ident=ALooper_pollOnce(timeout, NULL, &events,
                                      (void**)&source)) != ALOOPER_POLL_ERROR) {

            // Process this event.

            // If a sensor has data, process it now.
            /*
            if (ident == LOOPER_ID_USER) {
                if (g_engine.accelerometerSensor != NULL) {
                    ASensorEvent event;
                    while (ASensorEventQueue_getEvents(g_engine.sensorEventQueue, &event, 1) > 0) {
                        // LOGI("accelerometer: x=%f y=%f z=%f",
                        //      event.acceleration.x, event.acceleration.y,
                        //      event.acceleration.z);
                    }
                }
            }
            */
            if (source != NULL) {
                source->process(state, source);
                used = true;
            }

            if (g_engine.display == EGL_NO_DISPLAY || ident == ALOOPER_POLL_CALLBACK)
                continue;

            if (ident == ALOOPER_POLL_TIMEOUT)
                App::I->redraw = true;

            // Check if we are exiting.
            if (state->destroyRequested != 0) {
                engine_term_display(&g_engine);
                return;
            }
        }

        //if (engine.animating)
        if (g_engine.display != EGL_NO_DISPLAY)
        {
            if (pick_file_callback_context)
            {
                pick_file_callback_context();
                pick_file_callback_context = nullptr;
            }
        }
    }
}
//END_INCLUDE(all)