/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

// Disable symbol overrides so that we can use system headers.
#define FORBIDDEN_SYMBOL_ALLOW_ALL

#include "backends/platform/ios7/ios7_osys_main.h"
#include "backends/platform/ios7/ios7_video.h"

#include "backends/platform/ios7/ios7_app_delegate.h"

#define UIViewParentController(__view) ({ \
	UIResponder *__responder = __view; \
	while ([__responder isKindOfClass:[UIView class]]) \
		__responder = [__responder nextResponder]; \
	(UIViewController *)__responder; \
})

static void displayAlert(void *ctx) {
	UIAlertController* alert = [UIAlertController alertControllerWithTitle:@"Fatal Error"
								message:[NSString stringWithCString:(const char *)ctx 	encoding:NSUTF8StringEncoding]
								preferredStyle:UIAlertControllerStyleAlert];

	UIAlertAction* defaultAction = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault
	   handler:^(UIAlertAction * action) {
		OSystem_iOS7::sharedInstance()->quit();
		abort();
	}];

	[alert addAction:defaultAction];
	[UIViewParentController([iOS7AppDelegate iPhoneView]) presentViewController:alert animated:YES completion:nil];
}

void OSystem_iOS7::fatalError() {
	if (_lastErrorMessage.size()) {
		dispatch_async_f(dispatch_get_main_queue(), (void *)_lastErrorMessage.c_str(), displayAlert);
		for(;;);
	}
	else {
		OSystem::fatalError();
	}
}

void OSystem_iOS7::logMessage(LogMessageType::Type type, const char *message) {
	FILE *output = 0;

	if (type == LogMessageType::kInfo || type == LogMessageType::kDebug)
		output = stdout;
	else
		output = stderr;

	if (type == LogMessageType::kError) {
		_lastErrorMessage = message;
		NSString *messageString = [NSString stringWithUTF8String:message];
		NSLog(@"%@", messageString);
	}

	fputs(message, output);
	fflush(output);
}

static inline void execute_on_main_thread(void (^block)(void)) {
	if ([NSThread currentThread] == [NSThread mainThread]) {
		block();
	}
	else {
		dispatch_sync(dispatch_get_main_queue(), block);
	}
}

void OSystem_iOS7::engineInit() {
	EventsBaseBackend::engineInit();
	// Prevent the device going to sleep during game play (and in particular cut scenes)
	dispatch_async(dispatch_get_main_queue(), ^{
		[[UIApplication sharedApplication] setIdleTimerDisabled:YES];
	});
	[[iOS7AppDelegate iPhoneView] setIsInGame:YES];

#if TARGET_OS_IOS
	applyOrientationSettings();
	updateTouchMode();

	// Automatically open the keyboard when starting a game and in portrait mode.
	// This is preferred for text input games and there's a lot of screen space to
	// utilize for the keyboard anyway.
	if (_screenOrientation == kScreenOrientationPortrait ||
		_screenOrientation == kScreenOrientationFlippedPortrait) {
		execute_on_main_thread(^ {
			[[iOS7AppDelegate iPhoneView] showKeyboard];
		});
	}
#endif
}

void OSystem_iOS7::engineDone() {
	EventsBaseBackend::engineDone();
	// Allow the device going to sleep if idle while in the Launcher
	dispatch_async(dispatch_get_main_queue(), ^{
		[[UIApplication sharedApplication] setIdleTimerDisabled:NO];
	});
	[[iOS7AppDelegate iPhoneView] setIsInGame:NO];

#if TARGET_OS_IOS
	applyOrientationSettings();
	updateTouchMode();

	// Hide keyboard when going back to launcher
	execute_on_main_thread(^ {
		[[iOS7AppDelegate iPhoneView] hideKeyboard];
	});
#endif
}

void OSystem_iOS7::taskStarted(Task task) {
	EventsBaseBackend::taskStarted(task);
	if (_runningTasks++ == 0) {
		// Prevent the device going to sleep while a task is running
		dispatch_async(dispatch_get_main_queue(), ^{
			[[UIApplication sharedApplication] setIdleTimerDisabled:YES];
		});
	}
}
void OSystem_iOS7::taskFinished(Task task) {
	EventsBaseBackend::taskFinished(task);
	if (--_runningTasks == 0) {
		dispatch_async(dispatch_get_main_queue(), ^{
			[[UIApplication sharedApplication] setIdleTimerDisabled:NO];
		});
	}
}

void OSystem_iOS7::updateOutputSurface() {
	execute_on_main_thread(^ {
		[[iOS7AppDelegate iPhoneView] initSurface];
	});
}

void OSystem_iOS7::updateTouchMode() {
#if TARGET_OS_IOS
	execute_on_main_thread(^ {
		[[iOS7AppDelegate iPhoneView] updateTouchMode];
	});
#endif
}

void OSystem_iOS7::virtualController(bool connect) {
	execute_on_main_thread(^ {
		[[iOS7AppDelegate iPhoneView] virtualController:connect];
	});
}

bool OSystem_iOS7::isiOSAppOnMac() const {
	__block bool isiOSAppOnMac = false;
	execute_on_main_thread(^ {
		isiOSAppOnMac = [[iOS7AppDelegate iPhoneView] isiOSAppOnMac];
	});
	return isiOSAppOnMac;
}

void OSystem_iOS7::setShowKeyboard(bool show) {
	if (show) {
#if TARGET_OS_IOS
		execute_on_main_thread(^ {
			[[iOS7AppDelegate iPhoneView] showKeyboard];
		});
#elif TARGET_OS_TV
		// Delay the showing of keyboard 1 second so the user
		// is able to see the message
		dispatch_time_t delay = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.0 * NSEC_PER_SEC));
		dispatch_after(delay, dispatch_get_main_queue(), ^(void){
			[[iOS7AppDelegate iPhoneView] showKeyboard];
		});
#endif
	} else {
		// If in game, do not hide the keyboard in portrait mode as it is shown automatically and not
		// just when asked with the kFeatureVirtualKeyboard.
		if (_screenOrientation == kScreenOrientationLandscape || _screenOrientation == kScreenOrientationFlippedLandscape || ![[iOS7AppDelegate iPhoneView] isInGame]) {
			execute_on_main_thread(^ {
				[[iOS7AppDelegate iPhoneView] hideKeyboard];
			});
		}
	}
}

#if TARGET_OS_IOS
void OSystem_iOS7::setSupportedScreenOrientation(ScreenOrientation screenOrientation) {
	bool shouldUpdateScreenOrientation = false;

	switch (screenOrientation) {
	case kScreenOrientationPortrait:
	case kScreenOrientationFlippedPortrait:
		[[iOS7AppDelegate iPhoneView] setSupportedScreenOrientations:UIInterfaceOrientationMaskPortrait];
		if (_screenOrientation != kScreenOrientationPortrait &&
			_screenOrientation != kScreenOrientationFlippedPortrait) {
			shouldUpdateScreenOrientation = true;
		}
		break;
	case kScreenOrientationLandscape:
	case kScreenOrientationFlippedLandscape:
		[[iOS7AppDelegate iPhoneView] setSupportedScreenOrientations:UIInterfaceOrientationMaskLandscape];
		if (_screenOrientation != kScreenOrientationLandscape &&
			_screenOrientation != kScreenOrientationFlippedLandscape) {
			shouldUpdateScreenOrientation = true;
		}
		break;
	case kScreenOrientationAuto:
	default:
		[[iOS7AppDelegate iPhoneView] setSupportedScreenOrientations:UIInterfaceOrientationMaskAll];
		break;
	}

#ifdef __IPHONE_16_0
	if (@available(iOS 16.0, *)) {
		execute_on_main_thread(^ {
			[UIViewParentController([iOS7AppDelegate iPhoneView]) setNeedsUpdateOfSupportedInterfaceOrientations];
		});
		// We don't end up here if orientation is set to auto.
		// Also, we won't know for sure if it will select right or left for landscape
		// orientation, or normal or upside down (most probably normal) for portrait.
		// The _screenOrientation will be set accordingly when handling the orientationChanged
		// event so just set it to what we're given for now.
		_screenOrientation = screenOrientation;
	} else
#endif
	if (shouldUpdateScreenOrientation) {
		switch (screenOrientation) {
		case kScreenOrientationPortrait:
		case kScreenOrientationFlippedPortrait:
			execute_on_main_thread(^ {
				[[UIDevice currentDevice] setValue:@(UIInterfaceOrientationPortrait) forKey:@"orientation"];
				});
			_screenOrientation = kScreenOrientationPortrait;
			break;
		case kScreenOrientationLandscape:
		case kScreenOrientationFlippedLandscape:
			execute_on_main_thread(^ {
			[[UIDevice currentDevice] setValue:@(UIInterfaceOrientationLandscapeRight) forKey:@"orientation"];
				});
			_screenOrientation = kScreenOrientationLandscape;
			break;
		case kScreenOrientationAuto:
		default:
			break;
		}
	}
}
#endif

bool OSystem_iOS7::isKeyboardShown() const {
	__block bool isShown = false;
	execute_on_main_thread(^{
		isShown = [[iOS7AppDelegate iPhoneView] isKeyboardShown];
	});
	return isShown;
}

uint OSystem_iOS7::createOpenGLContext() {
	return [[iOS7AppDelegate iPhoneView] createOpenGLContext];
}

void OSystem_iOS7::destroyOpenGLContext() {
	[[iOS7AppDelegate iPhoneView] destroyOpenGLContext];
}

void OSystem_iOS7::refreshScreen() const {
	[[iOS7AppDelegate iPhoneView] refreshScreen];
}

int OSystem_iOS7::getScreenWidth() const {
	return [[iOS7AppDelegate iPhoneView] getScreenWidth];
}

int OSystem_iOS7::getScreenHeight() const {
	return [[iOS7AppDelegate iPhoneView] getScreenHeight];
}

float OSystem_iOS7::getSystemHiDPIScreenFactor() const {
	return [[UIScreen mainScreen] scale];
}