/*************************************************************************/
/*  os_iphone.mm                                                         */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/

#ifdef IPHONE_ENABLED

#include "os_iphone.h"

#include "drivers/gles2/rasterizer_gles2.h"
#include "drivers/gles3/rasterizer_gles3.h"
#include "servers/visual/visual_server_raster.h"
#include "servers/visual/visual_server_wrap_mt.h"

#include "main/main.h"

#include "core/io/file_access_pack.h"
#include "core/os/dir_access.h"
#include "core/os/file_access.h"
#include "core/project_settings.h"
#include "drivers/unix/syslog_logger.h"

#import "app_delegate.h"
#import "device_metrics.h"
#import "godot_view.h"
#import "keyboard_input_view.h"
#import "native_video_view.h"
#import "view_controller.h"

#include "tts_ios.h"

#import <UIKit/UIKit.h>
#include <dlfcn.h>
#include <sys/sysctl.h>
#import <sys/utsname.h>

extern int gl_view_base_fb; // from gl_view.mm
extern bool gles3_available; // from gl_view.mm

// Initialization order between compilation units is not guaranteed,
// so we use this as a hack to ensure certain code is called before
// everything else, but after all units are initialized.
typedef void (*init_callback)();
static init_callback *ios_init_callbacks = NULL;
static int ios_init_callbacks_count = 0;
static int ios_init_callbacks_capacity = 0;
HashMap<String, void *> OSIPhone::dynamic_symbol_lookup_table;

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

const char *OSIPhone::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) + ".");
};

OSIPhone *OSIPhone::get_singleton() {
	return (OSIPhone *)OS::get_singleton();
};

bool OSIPhone::tts_is_speaking() const {
	ERR_FAIL_COND_V(!tts, false);
	return [tts isSpeaking];
}

bool OSIPhone::tts_is_paused() const {
	ERR_FAIL_COND_V(!tts, false);
	return [tts isPaused];
}

Array OSIPhone::tts_get_voices() const {
	ERR_FAIL_COND_V(!tts, Array());
	return [tts getVoices];
}

void OSIPhone::tts_speak(const String &p_text, const String &p_voice, int p_volume, float p_pitch, float p_rate, int p_utterance_id, bool p_interrupt) {
	ERR_FAIL_COND(!tts);
	[tts speak:p_text voice:p_voice volume:p_volume pitch:p_pitch rate:p_rate utterance_id:p_utterance_id interrupt:p_interrupt];
}

void OSIPhone::tts_pause() {
	ERR_FAIL_COND(!tts);
	[tts pauseSpeaking];
}

void OSIPhone::tts_resume() {
	ERR_FAIL_COND(!tts);
	[tts resumeSpeaking];
}

void OSIPhone::tts_stop() {
	ERR_FAIL_COND(!tts);
	[tts stopSpeaking];
}

void OSIPhone::set_data_dir(String p_dir) {
	DirAccess *da = DirAccess::open(p_dir);

	data_dir = da->get_current_dir();
	printf("setting data dir to %ls from %ls\n", data_dir.c_str(), p_dir.c_str());
	memdelete(da);
};

String OSIPhone::get_unique_id() const {
	NSString *uuid = [UIDevice currentDevice].identifierForVendor.UUIDString;
	return String::utf8([uuid UTF8String]);
};

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

	set_data_dir(data_dir);
};

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

void OSIPhone::start() {
	Main::start();

	if (joypad_iphone) {
		joypad_iphone->start_processing();
	}
}

Error OSIPhone::initialize(const VideoMode &p_desired, int p_video_driver, int p_audio_driver) {
	bool 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 && gles3_available) {
				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) {
				RasterizerGLES2::register_config();
				RasterizerGLES2::make_current();
				break;
			} else {
				gl_initialization_error = true;
				break;
			}
		}
	}

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

	video_driver_index = p_video_driver;
	visual_server = memnew(VisualServerRaster);
	// FIXME: Reimplement threaded rendering
	if (get_render_thread_mode() != RENDER_THREAD_UNSAFE) {
		visual_server = memnew(VisualServerWrapMT(visual_server, false));
	}

	// Init TTS
	tts = [[TTS_IOS alloc] init];

	visual_server->init();
	//visual_server->cursor_set_visible(false, 0);

	// reset this to what it should be, it will have been set to 0 after visual_server->init() is called
	if (use_gl3) {
		RasterizerStorageGLES3::system_fbo = gl_view_base_fb;
	} else {
		RasterizerStorageGLES2::system_fbo = gl_view_base_fb;
	}

	AudioDriverManager::initialize(p_audio_driver);

	input = memnew(InputDefault);

	ios = memnew(iOS);
	Engine::get_singleton()->add_singleton(Engine::Singleton("iOS", ios));

	joypad_iphone = memnew(JoypadIPhone);

	return OK;
};

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

void OSIPhone::set_main_loop(MainLoop *p_main_loop) {
	main_loop = p_main_loop;

	if (main_loop) {
		input->set_main_loop(p_main_loop);
		main_loop->init();
	}
};

bool OSIPhone::iterate() {
	if (!main_loop) {
		return true;
	}

	input->flush_buffered_events();

	return Main::iteration();
};

void OSIPhone::key(uint32_t p_key, bool p_pressed) {
	Ref<InputEventKey> ev;
	ev.instance();
	ev->set_echo(false);
	ev->set_pressed(p_pressed);
	ev->set_scancode(p_key);
	ev->set_physical_scancode(p_key);
	ev->set_unicode(p_key);
	perform_event(ev);
};

void OSIPhone::pencil_press(int p_idx, int p_x, int p_y, bool p_pressed, bool p_doubleclick) {
	Ref<InputEventMouseButton> ev;
	ev.instance();
	ev->set_button_index(1);
	ev->set_pressed(p_pressed);
	ev->set_position(Vector2(p_x, p_y));
	ev->set_global_position(Vector2(p_x, p_y));
	ev->set_doubleclick(p_doubleclick);
	perform_event(ev);
};

void OSIPhone::pencil_drag(int p_idx, int p_prev_x, int p_prev_y, int p_x, int p_y, float p_force) {
	Ref<InputEventMouseMotion> ev;
	ev.instance();
	ev->set_pressure(p_force);
	ev->set_position(Vector2(p_x, p_y));
	ev->set_global_position(Vector2(p_x, p_y));
	ev->set_relative(Vector2(p_x - p_prev_x, p_y - p_prev_y));
	perform_event(ev);
};

void OSIPhone::pencil_cancelled(int p_idx) {
	pencil_press(p_idx, -1, -1, false, false);
}

void OSIPhone::touch_press(int p_idx, int p_x, int p_y, bool p_pressed, bool p_doubleclick) {
	if (GLOBAL_DEF("debug/disable_touch", false)) {
		return;
	}

	Ref<InputEventScreenTouch> ev;
	ev.instance();

	ev->set_index(p_idx);
	ev->set_pressed(p_pressed);
	ev->set_position(Vector2(p_x, p_y));
	perform_event(ev);
};

void OSIPhone::touch_drag(int p_idx, int p_prev_x, int p_prev_y, int p_x, int p_y) {
	if (GLOBAL_DEF("debug/disable_touch", false)) {
		return;
	}

	Ref<InputEventScreenDrag> ev;
	ev.instance();
	ev->set_index(p_idx);
	ev->set_position(Vector2(p_x, p_y));
	ev->set_relative(Vector2(p_x - p_prev_x, p_y - p_prev_y));
	perform_event(ev);
}

void OSIPhone::perform_event(const Ref<InputEvent> &p_event) {
	input->parse_input_event(p_event);
}

void OSIPhone::touches_cancelled(int p_idx) {
	touch_press(p_idx, -1, -1, false, false);
}

static const float ACCEL_RANGE = 1;

void OSIPhone::update_gravity(float p_x, float p_y, float p_z) {
	input->set_gravity(Vector3(p_x, p_y, p_z));
};

void OSIPhone::update_accelerometer(float p_x, float p_y, float p_z) {
	// Found out the Z should not be negated! Pass as is!
	input->set_accelerometer(Vector3(p_x / (float)ACCEL_RANGE, p_y / (float)ACCEL_RANGE, p_z / (float)ACCEL_RANGE));
};

void OSIPhone::update_magnetometer(float p_x, float p_y, float p_z) {
	input->set_magnetometer(Vector3(p_x, p_y, p_z));
};

void OSIPhone::update_gyroscope(float p_x, float p_y, float p_z) {
	input->set_gyroscope(Vector3(p_x, p_y, p_z));
};

int OSIPhone::get_unused_joy_id() {
	return input->get_unused_joy_id();
};

void OSIPhone::joy_connection_changed(int p_idx, bool p_connected, String p_name) {
	input->joy_connection_changed(p_idx, p_connected, p_name);
};

void OSIPhone::joy_button(int p_device, int p_button, bool p_pressed) {
	input->joy_button(p_device, p_button, p_pressed);
};

void OSIPhone::joy_axis(int p_device, int p_axis, float p_value) {
	input->joy_axis(p_device, p_axis, p_value);
};

void OSIPhone::delete_main_loop() {
	if (main_loop) {
		main_loop->finish();
		memdelete(main_loop);
	};

	main_loop = NULL;
};

void OSIPhone::finalize() {
	delete_main_loop();

	if (joypad_iphone) {
		memdelete(joypad_iphone);
	}

	if (input) {
		memdelete(input);
	}

	if (ios) {
		memdelete(ios);
	}

	visual_server->finish();
	memdelete(visual_server);
	//	memdelete(rasterizer);
}

void OSIPhone::set_mouse_show(bool p_show) {
	// Not supported for iOS
}

void OSIPhone::set_mouse_grab(bool p_grab) {
	// Not supported for iOS
}

bool OSIPhone::is_mouse_grab_enabled() const {
	// Not supported for iOS
	return true;
}

Point2 OSIPhone::get_mouse_position() const {
	// Not supported for iOS
	return Point2();
}

int OSIPhone::get_mouse_button_state() const {
	// Not supported for iOS
	return 0;
}

void OSIPhone::set_window_title(const String &p_title) {
	// Not supported for iOS
}

void OSIPhone::alert(const String &p_alert, const String &p_title) {
	const CharString utf8_alert = p_alert.utf8();
	const CharString utf8_title = p_title.utf8();
	iOS::alert(utf8_alert.get_data(), utf8_title.get_data());
}

// MARK: Dynamic Libraries

Error OSIPhone::open_dynamic_library(const String p_path, void *&p_library_handle, bool p_also_set_library_path) {
	if (p_path.length() == 0) {
		p_library_handle = RTLD_SELF;
		return OK;
	}
	return OS_Unix::open_dynamic_library(p_path, p_library_handle, p_also_set_library_path);
}

Error OSIPhone::close_dynamic_library(void *p_library_handle) {
	if (p_library_handle == RTLD_SELF) {
		return OK;
	}
	return OS_Unix::close_dynamic_library(p_library_handle);
}

void register_dynamic_symbol(char *name, void *address) {
	OSIPhone::dynamic_symbol_lookup_table[String(name)] = address;
}

Error OSIPhone::get_dynamic_library_symbol_handle(void *p_library_handle, const String p_name, void *&p_symbol_handle, bool p_optional) {
	if (p_library_handle == RTLD_SELF) {
		void **ptr = OSIPhone::dynamic_symbol_lookup_table.getptr(p_name);
		if (ptr) {
			p_symbol_handle = *ptr;
			return OK;
		}
	}
	return OS_Unix::get_dynamic_library_symbol_handle(p_library_handle, p_name, p_symbol_handle, p_optional);
}

void OSIPhone::set_video_mode(const VideoMode &p_video_mode, int p_screen) {
	video_mode = p_video_mode;
}

OS::VideoMode OSIPhone::get_video_mode(int p_screen) const {
	return video_mode;
}

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

void OSIPhone::set_offscreen_gl_context(EAGLContext *p_context) {
	offscreen_gl_context = p_context;
}

bool OSIPhone::is_offscreen_gl_available() const {
	return offscreen_gl_context;
}

void OSIPhone::set_offscreen_gl_current(bool p_current) {
	if (p_current) {
		[EAGLContext setCurrentContext:offscreen_gl_context];
	} else {
		[EAGLContext setCurrentContext:nil];
	}
}

bool OSIPhone::can_draw() const {
	if (native_video_is_playing())
		return false;
	return true;
}

int OSIPhone::set_base_framebuffer(int p_fb) {
	// gl_view_base_fb has not been updated yet
	RasterizerStorageGLES3::system_fbo = p_fb;

	return 0;
}

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

void OSIPhone::show_virtual_keyboard(const String &p_existing_text, const Rect2 &p_screen_rect, VirtualKeyboardType p_type, int p_max_input_length, int p_cursor_start, int p_cursor_end) {
	NSString *existingString = [[NSString alloc] initWithUTF8String:p_existing_text.utf8().get_data()];

	AppDelegate.viewController.keyboardView.keyboardType = UIKeyboardTypeDefault;
	AppDelegate.viewController.keyboardView.textContentType = nil;
	switch (p_type) {
		case KEYBOARD_TYPE_DEFAULT: {
			AppDelegate.viewController.keyboardView.keyboardType = UIKeyboardTypeDefault;
		} break;
		case KEYBOARD_TYPE_MULTILINE: {
			AppDelegate.viewController.keyboardView.keyboardType = UIKeyboardTypeDefault;
		} break;
		case KEYBOARD_TYPE_NUMBER: {
			AppDelegate.viewController.keyboardView.keyboardType = UIKeyboardTypeNumberPad;
		} break;
		case KEYBOARD_TYPE_NUMBER_DECIMAL: {
			AppDelegate.viewController.keyboardView.keyboardType = UIKeyboardTypeDecimalPad;
		} break;
		case KEYBOARD_TYPE_PHONE: {
			AppDelegate.viewController.keyboardView.keyboardType = UIKeyboardTypePhonePad;
			AppDelegate.viewController.keyboardView.textContentType = UITextContentTypeTelephoneNumber;
		} break;
		case KEYBOARD_TYPE_EMAIL_ADDRESS: {
			AppDelegate.viewController.keyboardView.keyboardType = UIKeyboardTypeEmailAddress;
			AppDelegate.viewController.keyboardView.textContentType = UITextContentTypeEmailAddress;
		} break;
		case KEYBOARD_TYPE_PASSWORD: {
			AppDelegate.viewController.keyboardView.keyboardType = UIKeyboardTypeDefault;
			if (@available(iOS 11.0, *)) {
				AppDelegate.viewController.keyboardView.textContentType = UITextContentTypePassword;
			}
		} break;
		case KEYBOARD_TYPE_URL: {
			AppDelegate.viewController.keyboardView.keyboardType = UIKeyboardTypeWebSearch;
			AppDelegate.viewController.keyboardView.textContentType = UITextContentTypeURL;
		} break;
	}

	[AppDelegate.viewController.keyboardView
			becomeFirstResponderWithString:existingString
							   cursorStart:p_cursor_start
								 cursorEnd:p_cursor_end];
};

void OSIPhone::hide_virtual_keyboard() {
	[AppDelegate.viewController.keyboardView resignFirstResponder];
}

void OSIPhone::set_virtual_keyboard_height(int p_height) {
	virtual_keyboard_height = p_height * [UIScreen mainScreen].nativeScale;
}

int OSIPhone::get_virtual_keyboard_height() const {
	return virtual_keyboard_height;
}

Error OSIPhone::shell_open(String p_uri) {
	NSString *urlPath = [[NSString alloc] initWithUTF8String:p_uri.utf8().get_data()];
	NSURL *url = [NSURL URLWithString:urlPath];

	if (![[UIApplication sharedApplication] canOpenURL:url]) {
		return ERR_CANT_OPEN;
	}

	printf("opening url %s\n", p_uri.utf8().get_data());

	[[UIApplication sharedApplication] openURL:url options:@{} completionHandler:nil];

	return OK;
}

void OSIPhone::set_keep_screen_on(bool p_enabled) {
	OS::set_keep_screen_on(p_enabled);
	[UIApplication sharedApplication].idleTimerDisabled = p_enabled;
};

String OSIPhone::get_user_data_dir() const {
	return data_dir;
}

String OSIPhone::get_name() const {
	return "iOS";
}

void OSIPhone::set_clipboard(const String &p_text) {
	[UIPasteboard generalPasteboard].string = [NSString stringWithUTF8String:p_text.utf8()];
}

String OSIPhone::get_clipboard() const {
	NSString *text = [UIPasteboard generalPasteboard].string;

	return String::utf8([text UTF8String]);
}

String OSIPhone::get_cache_path() const {
	return cache_dir;
}

String OSIPhone::get_model_name() const {
	String model = ios->get_model();
	if (model != "") {
		return model;
	}

	return OS_Unix::get_model_name();
}

Size2 OSIPhone::get_window_size() const {
	return Vector2(video_mode.width, video_mode.height);
}

int OSIPhone::get_screen_dpi(int p_screen) const {
	struct utsname systemInfo;
	uname(&systemInfo);

	NSString *string = [NSString stringWithCString:systemInfo.machine encoding:NSUTF8StringEncoding];

	NSDictionary *iOSModelToDPI = [GodotDeviceMetrics dpiList];

	for (NSArray *keyArray in iOSModelToDPI) {
		if ([keyArray containsObject:string]) {
			NSNumber *value = iOSModelToDPI[keyArray];
			return [value intValue];
		}
	}

	// If device wasn't found in dictionary
	// make a best guess from device metrics.
	CGFloat scale = [UIScreen mainScreen].scale;

	UIUserInterfaceIdiom idiom = [UIDevice currentDevice].userInterfaceIdiom;

	switch (idiom) {
		case UIUserInterfaceIdiomPad:
			return scale == 2 ? 264 : 132;
		case UIUserInterfaceIdiomPhone: {
			if (scale == 3) {
				CGFloat nativeScale = [UIScreen mainScreen].nativeScale;
				return nativeScale == 3 ? 458 : 401;
			}

			return 326;
		}
		default:
			return 72;
	}
}

float OSIPhone::get_screen_refresh_rate(int p_screen) const {
	return [UIScreen mainScreen].maximumFramesPerSecond;
}

Rect2 OSIPhone::get_window_safe_area() const {
	if (@available(iOS 11, *)) {
		UIEdgeInsets insets = UIEdgeInsetsZero;
		UIView *view = AppDelegate.viewController.godotView;

		if ([view respondsToSelector:@selector(safeAreaInsets)]) {
			insets = [view safeAreaInsets];
		}

		float scale = [UIScreen mainScreen].nativeScale;
		Size2i insets_position = Size2i(insets.left, insets.top) * scale;
		Size2i insets_size = Size2i(insets.left + insets.right, insets.top + insets.bottom) * scale;

		return Rect2i(insets_position, get_window_size() - insets_size);
	} else {
		return Rect2i(Size2i(0, 0), get_window_size());
	}
}

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

String OSIPhone::get_locale() const {
	NSString *preferedLanguage = [NSLocale preferredLanguages].firstObject;

	if (preferedLanguage) {
		return String::utf8([preferedLanguage UTF8String]).replace("-", "_");
	}

	NSString *localeIdentifier = [[NSLocale currentLocale] localeIdentifier];
	return String::utf8([localeIdentifier UTF8String]).replace("-", "_");
}

Error OSIPhone::native_video_play(String p_path, float p_volume, String p_audio_track, String p_subtitle_track) {
	FileAccess *f = FileAccess::open(p_path, FileAccess::READ);
	bool exists = f && f->is_open();

	String user_data_dir = OSIPhone::get_singleton()->get_user_data_dir();

	if (!exists) {
		return FAILED;
	}

	String tempFile = OSIPhone::get_singleton()->get_user_data_dir();

	if (p_path.begins_with("res://")) {
		if (PackedData::get_singleton()->has_path(p_path)) {
			printf("Unable to play %s using the native player as it resides in a .pck file\n", p_path.utf8().get_data());
			return ERR_INVALID_PARAMETER;
		} else {
			p_path = p_path.replace("res:/", ProjectSettings::get_singleton()->get_resource_path());
		}
	} else if (p_path.begins_with("user://")) {
		p_path = p_path.replace("user:/", user_data_dir);
	}

	memdelete(f);

	printf("Playing video: %s\n", p_path.utf8().get_data());

	String file_path = ProjectSettings::get_singleton()->globalize_path(p_path);

	NSString *filePath = [[NSString alloc] initWithUTF8String:file_path.utf8().get_data()];
	NSString *audioTrack = [NSString stringWithUTF8String:p_audio_track.utf8()];
	NSString *subtitleTrack = [NSString stringWithUTF8String:p_subtitle_track.utf8()];

	if (![AppDelegate.viewController playVideoAtPath:filePath
											  volume:p_volume
											   audio:audioTrack
											subtitle:subtitleTrack]) {
		return OK;
	}

	return FAILED;
}

bool OSIPhone::native_video_is_playing() const {
	return [AppDelegate.viewController.videoView isVideoPlaying];
}

void OSIPhone::native_video_pause() {
	if (native_video_is_playing()) {
		[AppDelegate.viewController.videoView pauseVideo];
	}
}

void OSIPhone::native_video_unpause() {
	[AppDelegate.viewController.videoView unpauseVideo];
}

void OSIPhone::native_video_focus_out() {
	[AppDelegate.viewController.videoView unfocusVideo];
}

void OSIPhone::native_video_stop() {
	if (native_video_is_playing()) {
		[AppDelegate.viewController.videoView stopVideo];
	}
}

String OSIPhone::get_processor_name() const {
	char buffer[256];
	size_t buffer_len = 256;
	if (sysctlbyname("machdep.cpu.brand_string", &buffer, &buffer_len, NULL, 0) == 0) {
		return String::utf8(buffer, buffer_len);
	}
	ERR_FAIL_V_MSG("", String("Couldn't get the CPU model name. Returning an empty string."));
}

void OSIPhone::vibrate_handheld(int p_duration_ms) {
	if (ios->supports_haptic_engine()) {
		ios->vibrate_haptic_engine((float)p_duration_ms / 1000.f);
	} else {
		// iOS <13 does not support duration for vibration
		AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);
	}
}

bool OSIPhone::_check_internal_feature_support(const String &p_feature) {
	return p_feature == "mobile";
}

void add_ios_init_callback(init_callback cb) {
	if (ios_init_callbacks_count == ios_init_callbacks_capacity) {
		void *new_ptr = realloc(ios_init_callbacks, sizeof(cb) * 32);
		if (new_ptr) {
			ios_init_callbacks = (init_callback *)(new_ptr);
			ios_init_callbacks_capacity += 32;
		}
	}
	if (ios_init_callbacks_capacity > ios_init_callbacks_count) {
		ios_init_callbacks[ios_init_callbacks_count] = cb;
		++ios_init_callbacks_count;
	}
}

OSIPhone::OSIPhone(String p_data_dir, String p_cache_dir) {
	for (int i = 0; i < ios_init_callbacks_count; ++i) {
		ios_init_callbacks[i]();
	}
	free(ios_init_callbacks);
	ios_init_callbacks = NULL;
	ios_init_callbacks_count = 0;
	ios_init_callbacks_capacity = 0;

	main_loop = NULL;
	visual_server = NULL;
	offscreen_gl_context = NULL;

	// can't call set_data_dir from here, since it requires DirAccess
	// which is initialized in initialize_core
	data_dir = p_data_dir;
	cache_dir = p_cache_dir;

	Vector<Logger *> loggers;
	loggers.push_back(memnew(SyslogLogger));
#ifdef DEBUG_ENABLED
	// it seems iOS app's stdout/stderr is only obtainable if you launch it from Xcode
	loggers.push_back(memnew(StdLogger));
#endif
	_set_logger(memnew(CompositeLogger(loggers)));

	AudioDriverManager::add_driver(&audio_driver);
};

OSIPhone::~OSIPhone() {
}

void OSIPhone::on_focus_out() {
	if (is_focused) {
		is_focused = false;

		if (get_main_loop()) {
			get_main_loop()->notification(MainLoop::NOTIFICATION_WM_FOCUS_OUT);
		}

		[AppDelegate.viewController.godotView stopRendering];

		if (native_video_is_playing()) {
			native_video_focus_out();
		}

		audio_driver.stop();
	}
}

void OSIPhone::on_focus_in() {
	if (!is_focused) {
		is_focused = true;

		if (get_main_loop()) {
			get_main_loop()->notification(MainLoop::NOTIFICATION_WM_FOCUS_IN);
		}

		[AppDelegate.viewController.godotView startRendering];

		if (native_video_is_playing()) {
			native_video_unpause();
		}

		audio_driver.start();
	}
}

#endif