/*************************************************************************/
/*  os_android.cpp                                                       */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
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/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
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/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/*************************************************************************/

#include "os_android.h"

#include "core/project_settings.h"
#include "drivers/gles2/rasterizer_gles2.h"
#include "drivers/gles3/rasterizer_gles3.h"
#include "drivers/unix/dir_access_unix.h"
#include "drivers/unix/file_access_unix.h"
#include "main/main.h"
#include "scene/main/scene_tree.h"
#include "servers/visual/visual_server_raster.h"
#include "servers/visual/visual_server_wrap_mt.h"

#include "dir_access_jandroid.h"
#include "file_access_android.h"
#include "net_socket_android.h"

#include <android/input.h>
#include <core/os/keyboard.h>
#include <dlfcn.h>

#include "java_godot_io_wrapper.h"
#include "java_godot_wrapper.h"

const char *OS_Android::ANDROID_EXEC_PATH = "apk";

String _remove_symlink(const String &dir) {
	// Workaround for Android 6.0+ using a symlink.
	// Save the current directory.
	char current_dir_name[2048];
	getcwd(current_dir_name, 2048);
	// Change directory to the external data directory.
	chdir(dir.utf8().get_data());
	// Get the actual directory without the potential symlink.
	char dir_name_wihout_symlink[2048];
	getcwd(dir_name_wihout_symlink, 2048);
	// Convert back to a String.
	String dir_without_symlink(dir_name_wihout_symlink);
	// Restore original current directory.
	chdir(current_dir_name);
	return dir_without_symlink;
}

class AndroidLogger : public Logger {
public:
	virtual void logv(const char *p_format, va_list p_list, bool p_err) {
		__android_log_vprint(p_err ? ANDROID_LOG_ERROR : ANDROID_LOG_INFO, "godot", p_format, p_list);
	}

	virtual ~AndroidLogger() {}
};

int OS_Android::get_video_driver_count() const {
	return 2;
}

const char *OS_Android::get_video_driver_name(int p_driver) const {
	switch (p_driver) {
		case VIDEO_DRIVER_GLES3:
			return "GLES3";
		case VIDEO_DRIVER_GLES2:
			return "GLES2";
	}
	ERR_FAIL_V_MSG(NULL, "Invalid video driver index: " + itos(p_driver) + ".");
}
int OS_Android::get_audio_driver_count() const {
	return 1;
}

const char *OS_Android::get_audio_driver_name(int p_driver) const {
	return "Android";
}

void OS_Android::initialize_core() {
	OS_Unix::initialize_core();

#ifdef TOOLS_ENABLED
	FileAccess::make_default<FileAccessUnix>(FileAccess::ACCESS_RESOURCES);
#else
	if (use_apk_expansion)
		FileAccess::make_default<FileAccessUnix>(FileAccess::ACCESS_RESOURCES);
	else {
		FileAccess::make_default<FileAccessAndroid>(FileAccess::ACCESS_RESOURCES);
	}
#endif
	FileAccess::make_default<FileAccessUnix>(FileAccess::ACCESS_USERDATA);
	FileAccess::make_default<FileAccessUnix>(FileAccess::ACCESS_FILESYSTEM);

#ifdef TOOLS_ENABLED
	DirAccess::make_default<DirAccessUnix>(DirAccess::ACCESS_RESOURCES);
#else
	if (use_apk_expansion)
		DirAccess::make_default<DirAccessUnix>(DirAccess::ACCESS_RESOURCES);
	else
		DirAccess::make_default<DirAccessJAndroid>(DirAccess::ACCESS_RESOURCES);
#endif

	DirAccess::make_default<DirAccessUnix>(DirAccess::ACCESS_USERDATA);
	DirAccess::make_default<DirAccessUnix>(DirAccess::ACCESS_FILESYSTEM);

	NetSocketAndroid::make_default();
}

void OS_Android::set_opengl_extensions(const char *p_gl_extensions) {
	ERR_FAIL_COND(!p_gl_extensions);
	gl_extensions = p_gl_extensions;
}

int OS_Android::get_current_video_driver() const {
	return video_driver_index;
}

Error OS_Android::initialize(const VideoMode &p_desired, int p_video_driver, int p_audio_driver) {
	bool use_gl3 = godot_java->get_gles_version_code() >= 0x00030000;
	use_gl3 = use_gl3 && (GLOBAL_GET("rendering/quality/driver/driver_name") == "GLES3");
	bool gl_initialization_error = false;

	while (true) {
		if (use_gl3) {
			if (RasterizerGLES3::is_viable() == OK) {
				godot_java->gfx_init(false);
				RasterizerGLES3::register_config();
				RasterizerGLES3::make_current();
				break;
			} else {
				if (GLOBAL_GET("rendering/quality/driver/fallback_to_gles2")) {
					p_video_driver = VIDEO_DRIVER_GLES2;
					use_gl3 = false;
					continue;
				} else {
					gl_initialization_error = true;
					break;
				}
			}
		} else {
			if (RasterizerGLES2::is_viable() == OK) {
				godot_java->gfx_init(true);
				RasterizerGLES2::register_config();
				RasterizerGLES2::make_current();
				break;
			} else {
				gl_initialization_error = true;
				break;
			}
		}
	}

	transparency_enabled = p_desired.layered;

	if (gl_initialization_error) {
		OS::get_singleton()->alert("Your device does not support any of the supported OpenGL versions.\n"
								   "Please try updating your Android version.",
				"Unable to initialize Video driver");
		return ERR_UNAVAILABLE;
	}

	video_driver_index = p_video_driver;

	visual_server = memnew(VisualServerRaster);
	if (get_render_thread_mode() != RENDER_THREAD_UNSAFE) {
		visual_server = memnew(VisualServerWrapMT(visual_server, false));
	}

	visual_server->init();

	AudioDriverManager::initialize(p_audio_driver);

	input = memnew(InputDefault);
	input->set_use_input_buffering(true); // Needed because events will come directly from the UI thread
	input->set_fallback_mapping(godot_java->get_input_fallback_mapping());

	//power_manager = memnew(PowerAndroid);

	return OK;
}

void OS_Android::set_main_loop(MainLoop *p_main_loop) {
	main_loop = p_main_loop;
	input->set_main_loop(p_main_loop);
}

void OS_Android::delete_main_loop() {
	memdelete(main_loop);
}

void OS_Android::finalize() {
	memdelete(input);
}

GodotJavaWrapper *OS_Android::get_godot_java() {
	return godot_java;
}

GodotIOJavaWrapper *OS_Android::get_godot_io_java() {
	return godot_io_java;
}

void OS_Android::alert(const String &p_alert, const String &p_title) {
	//print("ALERT: %s\n", p_alert.utf8().get_data());
	godot_java->alert(p_alert, p_title);
}

bool OS_Android::request_permission(const String &p_name) {
	return godot_java->request_permission(p_name);
}

bool OS_Android::request_permissions() {
	return godot_java->request_permissions();
}

Vector<String> OS_Android::get_granted_permissions() const {
	return godot_java->get_granted_permissions();
}

Error OS_Android::open_dynamic_library(const String p_path, void *&p_library_handle, bool p_also_set_library_path) {
	p_library_handle = dlopen(p_path.utf8().get_data(), RTLD_NOW);
	ERR_FAIL_COND_V_MSG(!p_library_handle, ERR_CANT_OPEN, "Can't open dynamic library: " + p_path + ", error: " + dlerror() + ".");
	return OK;
}

void OS_Android::set_mouse_show(bool p_show) {
	//android has no mouse...
}

void OS_Android::set_mouse_grab(bool p_grab) {
	//it really has no mouse...!
}

bool OS_Android::is_mouse_grab_enabled() const {
	//*sigh* technology has evolved so much since i was a kid..
	return false;
}

Point2 OS_Android::get_mouse_position() const {
	return input->get_mouse_position();
}

int OS_Android::get_mouse_button_state() const {
	return input->get_mouse_button_mask();
}

void OS_Android::set_window_title(const String &p_title) {
	//This queries/updates the currently connected devices/joypads
	//Set_window_title is called when initializing the main loop (main.cpp)
	//therefore this place is found to be suitable (I found no better).
	godot_java->init_input_devices();
}

void OS_Android::set_video_mode(const VideoMode &p_video_mode, int p_screen) {
}

OS::VideoMode OS_Android::get_video_mode(int p_screen) const {
	return default_videomode;
}

void OS_Android::get_fullscreen_mode_list(List<VideoMode> *p_list, int p_screen) const {
	p_list->push_back(default_videomode);
}

void OS_Android::set_keep_screen_on(bool p_enabled) {
	OS::set_keep_screen_on(p_enabled);

	godot_java->set_keep_screen_on(p_enabled);
}

Size2 OS_Android::get_window_size() const {
	return Vector2(default_videomode.width, default_videomode.height);
}

Rect2 OS_Android::get_window_safe_area() const {
	int xywh[4];
	godot_io_java->get_window_safe_area(xywh);
	return Rect2(xywh[0], xywh[1], xywh[2], xywh[3]);
}

String OS_Android::get_name() const {
	return "Android";
}

MainLoop *OS_Android::get_main_loop() const {
	return main_loop;
}

bool OS_Android::can_draw() const {
	return true; //always?
}

void OS_Android::main_loop_begin() {
	if (main_loop)
		main_loop->init();
}

bool OS_Android::main_loop_iterate(bool *r_should_swap_buffers) {
	if (!main_loop)
		return false;
	uint64_t current_frames_drawn = Engine::get_singleton()->get_frames_drawn();
	bool exit = Main::iteration();

	if (r_should_swap_buffers) {
		*r_should_swap_buffers = !is_in_low_processor_usage_mode() || _update_pending || current_frames_drawn != Engine::get_singleton()->get_frames_drawn();
	}

	return exit;
}

void OS_Android::main_loop_end() {
	if (main_loop) {
		SceneTree *scene_tree = Object::cast_to<SceneTree>(main_loop);
		if (scene_tree) {
			scene_tree->quit();
		}
		main_loop->finish();
	}
}

void OS_Android::main_loop_focusout() {
	if (main_loop)
		main_loop->notification(MainLoop::NOTIFICATION_WM_FOCUS_OUT);
	audio_driver_android.set_pause(true);
}

void OS_Android::main_loop_focusin() {
	if (main_loop)
		main_loop->notification(MainLoop::NOTIFICATION_WM_FOCUS_IN);
	audio_driver_android.set_pause(false);
}

void OS_Android::process_accelerometer(const Vector3 &p_accelerometer) {
	input->set_accelerometer(p_accelerometer);
}

void OS_Android::process_gravity(const Vector3 &p_gravity) {
	input->set_gravity(p_gravity);
}

void OS_Android::process_magnetometer(const Vector3 &p_magnetometer) {
	input->set_magnetometer(p_magnetometer);
}

void OS_Android::process_gyroscope(const Vector3 &p_gyroscope) {
	input->set_gyroscope(p_gyroscope);
}

bool OS_Android::has_touchscreen_ui_hint() const {
	return true;
}

bool OS_Android::has_virtual_keyboard() const {
	return true;
}

int OS_Android::get_virtual_keyboard_height() const {
	return godot_io_java->get_vk_height();

	// ERR_PRINT("Cannot obtain virtual keyboard height.");
	// return 0;
}

void OS_Android::show_virtual_keyboard(const String &p_existing_text, const Rect2 &p_screen_rect, bool p_multiline, int p_max_input_length, int p_cursor_start, int p_cursor_end) {
	if (godot_io_java->has_vk()) {
		godot_io_java->show_vk(p_existing_text, p_multiline, p_max_input_length, p_cursor_start, p_cursor_end);
	} else {
		ERR_PRINT("Virtual keyboard not available");
	};
}

void OS_Android::hide_virtual_keyboard() {
	if (godot_io_java->has_vk()) {
		godot_io_java->hide_vk();
	} else {
		ERR_PRINT("Virtual keyboard not available");
	};
}

void OS_Android::init_video_mode(int p_video_width, int p_video_height) {
	default_videomode.width = p_video_width;
	default_videomode.height = p_video_height;
	default_videomode.fullscreen = true;
	default_videomode.resizable = false;
}

void OS_Android::set_display_size(Size2 p_size) {
	default_videomode.width = p_size.x;
	default_videomode.height = p_size.y;
}

Error OS_Android::shell_open(String p_uri) {
	return godot_io_java->open_uri(p_uri);
}

String OS_Android::get_resource_dir() const {
#ifdef TOOLS_ENABLED
	return OS_Unix::get_resource_dir();
#else
	return "/"; //android has its own filesystem for resources inside the APK
#endif
}

String OS_Android::get_locale() const {
	String locale = godot_io_java->get_locale();
	if (locale != "") {
		return locale;
	}

	return OS_Unix::get_locale();
}

void OS_Android::set_clipboard(const String &p_text) {
	// DO we really need the fallback to OS_Unix here?!
	if (godot_java->has_set_clipboard()) {
		godot_java->set_clipboard(p_text);
	} else {
		OS_Unix::set_clipboard(p_text);
	}
}

String OS_Android::get_clipboard() const {
	// DO we really need the fallback to OS_Unix here?!
	if (godot_java->has_get_clipboard()) {
		return godot_java->get_clipboard();
	}

	return OS_Unix::get_clipboard();
}

bool OS_Android::has_clipboard() const {
	// DO we really need the fallback to OS_Unix here?!
	if (godot_java->has_has_clipboard()) {
		return godot_java->has_clipboard();
	}

	return OS_Unix::has_clipboard();
}

String OS_Android::get_model_name() const {
	String model = godot_io_java->get_model();
	if (model != "")
		return model;

	return OS_Unix::get_model_name();
}

int OS_Android::get_screen_dpi(int p_screen) const {
	return godot_io_java->get_screen_dpi();
}

float OS_Android::get_screen_scale(int p_screen) const {
	return godot_io_java->get_scaled_density();
}

float OS_Android::get_screen_max_scale() const {
	return get_screen_scale();
}

float OS_Android::get_screen_refresh_rate(int p_screen) const {
	return godot_io_java->get_screen_refresh_rate(OS::get_singleton()->SCREEN_REFRESH_RATE_FALLBACK);
}

String OS_Android::get_data_path() const {
	return get_user_data_dir();
}

String OS_Android::get_executable_path() const {
	// Since unix process creation is restricted on Android, we bypass
	// OS_Unix::get_executable_path() so we can return ANDROID_EXEC_PATH.
	// Detection of ANDROID_EXEC_PATH allows to handle process creation in an Android compliant
	// manner.
	return OS::get_executable_path();
}

String OS_Android::get_user_data_dir() const {
	if (data_dir_cache != String())
		return data_dir_cache;

	String data_dir = godot_io_java->get_user_data_dir();
	if (data_dir != "") {
		data_dir_cache = _remove_symlink(data_dir);
		return data_dir_cache;
	}
	return ".";
}

String OS_Android::get_cache_path() const {
	if (cache_dir_cache != String())
		return cache_dir_cache;

	String cache_dir = godot_io_java->get_cache_dir();
	if (cache_dir != "") {
		cache_dir_cache = _remove_symlink(cache_dir);
		return cache_dir_cache;
	}
	return ".";
}

void OS_Android::set_screen_orientation(ScreenOrientation p_orientation) {
	godot_io_java->set_screen_orientation(p_orientation);
}

OS::ScreenOrientation OS_Android::get_screen_orientation() const {
	const int orientation = godot_io_java->get_screen_orientation();
	ERR_FAIL_INDEX_V_MSG(orientation, 7, OS::ScreenOrientation(0), "Unrecognized screen orientation.");
	return OS::ScreenOrientation(orientation);
}

String OS_Android::get_unique_id() const {
	String unique_id = godot_io_java->get_unique_id();
	if (unique_id != "")
		return unique_id;

	return OS::get_unique_id();
}

String OS_Android::get_system_dir(SystemDir p_dir, bool p_shared_storage) const {
	return godot_io_java->get_system_dir(p_dir, p_shared_storage);
}

void OS_Android::set_offscreen_gl_available(bool p_available) {
	secondary_gl_available = p_available;
}

bool OS_Android::is_offscreen_gl_available() const {
	return secondary_gl_available;
}

void OS_Android::set_offscreen_gl_current(bool p_current) {
	if (secondary_gl_available) {
		godot_java->set_offscreen_gl_current(nullptr, p_current);
	}
}

bool OS_Android::is_joy_known(int p_device) {
	return input->is_joy_mapped(p_device);
}

String OS_Android::get_joy_guid(int p_device) const {
	return input->get_joy_guid_remapped(p_device);
}

void OS_Android::vibrate_handheld(int p_duration_ms) {
	godot_java->vibrate(p_duration_ms);
}

String OS_Android::get_config_path() const {
	return get_user_data_dir().plus_file("config");
}

bool OS_Android::_check_internal_feature_support(const String &p_feature) {
	if (p_feature == "mobile") {
		//TODO support etc2 only if GLES3 driver is selected
		return true;
	}
#if defined(__aarch64__)
	if (p_feature == "arm64-v8a") {
		return true;
	}
#elif defined(__ARM_ARCH_7A__)
	if (p_feature == "armeabi-v7a" || p_feature == "armeabi") {
		return true;
	}
#elif defined(__arm__)
	if (p_feature == "armeabi") {
		return true;
	}
#endif
	return false;
}

OS_Android::OS_Android(GodotJavaWrapper *p_godot_java, GodotIOJavaWrapper *p_godot_io_java, bool p_use_apk_expansion) {
	use_apk_expansion = p_use_apk_expansion;
	default_videomode.width = 800;
	default_videomode.height = 600;
	default_videomode.fullscreen = true;
	default_videomode.resizable = false;

	main_loop = NULL;
	gl_extensions = NULL;
	//rasterizer = NULL;
	use_gl2 = false;

	godot_java = p_godot_java;
	godot_io_java = p_godot_io_java;

	Vector<Logger *> loggers;
	loggers.push_back(memnew(AndroidLogger));
	_set_logger(memnew(CompositeLogger(loggers)));

	AudioDriverManager::add_driver(&audio_driver_android);
}

Error OS_Android::execute(const String &p_path, const List<String> &p_arguments, bool p_blocking, ProcessID *r_child_id, String *r_pipe, int *r_exitcode, bool read_stderr, Mutex *p_pipe_mutex, bool p_open_console) {
	if (p_path == ANDROID_EXEC_PATH) {
		return create_instance(p_arguments, r_child_id);
	} else {
		return OS_Unix::execute(p_path, p_arguments, p_blocking, r_child_id, r_pipe, r_exitcode, read_stderr, p_pipe_mutex, p_open_console);
	}
}

Error OS_Android::create_instance(const List<String> &p_arguments, ProcessID *r_child_id) {
	godot_java->create_new_godot_instance(p_arguments);
	return OK;
}

OS_Android::~OS_Android() {
}