/*
  ==============================================================================

   This file is part of the JUCE library.
   Copyright (c) 2020 - Raw Material Software Limited

   JUCE is an open source library subject to commercial or open-source
   licensing.

   By using JUCE, you agree to the terms of both the JUCE 6 End-User License
   Agreement and JUCE Privacy Policy (both effective as of the 16th June 2020).

   End User License Agreement: www.juce.com/juce-6-licence
   Privacy Policy: www.juce.com/juce-privacy-policy

   Or: You may also use this code under the terms of the GPL v3 (see
   www.gnu.org/licenses).

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

  ==============================================================================
*/

namespace juce
{
    extern bool isIOSAppActive;

    struct AppInactivityCallback // NB: careful, this declaration is duplicated in other modules
    {
        virtual ~AppInactivityCallback() = default;
        virtual void appBecomingInactive() = 0;
    };

    // This is an internal list of callbacks (but currently used between modules)
    Array<AppInactivityCallback*> appBecomingInactiveCallbacks;
}

#if JUCE_PUSH_NOTIFICATIONS && defined (__IPHONE_10_0) && __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_10_0
@interface JuceAppStartupDelegate : NSObject <UIApplicationDelegate, UNUserNotificationCenterDelegate>
#else
@interface JuceAppStartupDelegate : NSObject <UIApplicationDelegate>
#endif
{
    UIBackgroundTaskIdentifier appSuspendTask;
}

@property (strong, nonatomic) UIWindow *window;
- (id) init;
- (void) dealloc;
- (void) applicationDidFinishLaunching: (UIApplication*) application;
- (void) applicationWillTerminate: (UIApplication*) application;
- (void) applicationDidEnterBackground: (UIApplication*) application;
- (void) applicationWillEnterForeground: (UIApplication*) application;
- (void) applicationDidBecomeActive: (UIApplication*) application;
- (void) applicationWillResignActive: (UIApplication*) application;
- (void) application: (UIApplication*) application handleEventsForBackgroundURLSession: (NSString*) identifier
   completionHandler: (void (^)(void)) completionHandler;
- (void) applicationDidReceiveMemoryWarning: (UIApplication *) application;
#if JUCE_PUSH_NOTIFICATIONS
- (void) application: (UIApplication*) application didRegisterUserNotificationSettings: (UIUserNotificationSettings*) notificationSettings;
- (void) application: (UIApplication*) application didRegisterForRemoteNotificationsWithDeviceToken: (NSData*) deviceToken;
- (void) application: (UIApplication*) application didFailToRegisterForRemoteNotificationsWithError: (NSError*) error;
- (void) application: (UIApplication*) application didReceiveRemoteNotification: (NSDictionary*) userInfo;
- (void) application: (UIApplication*) application didReceiveRemoteNotification: (NSDictionary*) userInfo
  fetchCompletionHandler: (void (^)(UIBackgroundFetchResult result)) completionHandler;
- (void) application: (UIApplication*) application handleActionWithIdentifier: (NSString*) identifier
  forRemoteNotification: (NSDictionary*) userInfo withResponseInfo: (NSDictionary*) responseInfo
   completionHandler: (void(^)()) completionHandler;
- (void) application: (UIApplication*) application didReceiveLocalNotification: (UILocalNotification*) notification;
- (void) application: (UIApplication*) application handleActionWithIdentifier: (NSString*) identifier
  forLocalNotification: (UILocalNotification*) notification completionHandler: (void(^)()) completionHandler;
- (void) application: (UIApplication*) application handleActionWithIdentifier: (NSString*) identifier
  forLocalNotification: (UILocalNotification*) notification withResponseInfo: (NSDictionary*) responseInfo
   completionHandler: (void(^)()) completionHandler;
#if defined (__IPHONE_10_0) && __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_10_0
- (void) userNotificationCenter: (UNUserNotificationCenter*) center willPresentNotification: (UNNotification*) notification
          withCompletionHandler: (void (^)(UNNotificationPresentationOptions options)) completionHandler;
- (void) userNotificationCenter: (UNUserNotificationCenter*) center didReceiveNotificationResponse: (UNNotificationResponse*) response
          withCompletionHandler: (void(^)())completionHandler;
#endif
#endif

@end

@implementation JuceAppStartupDelegate

    NSObject* _pushNotificationsDelegate;

- (id) init
{
    self = [super init];
    appSuspendTask = UIBackgroundTaskInvalid;

   #if JUCE_PUSH_NOTIFICATIONS && defined (__IPHONE_10_0) && __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_10_0
    [UNUserNotificationCenter currentNotificationCenter].delegate = self;
   #endif

    return self;
}

- (void) dealloc
{
    [super dealloc];
}

- (void) applicationDidFinishLaunching: (UIApplication*) application
{
    ignoreUnused (application);
    initialiseJuce_GUI();

    if (auto* app = JUCEApplicationBase::createInstance())
    {
        if (! app->initialiseApp())
            exit (app->shutdownApp());
    }
    else
    {
        jassertfalse; // you must supply an application object for an iOS app!
    }
}

- (void) applicationWillTerminate: (UIApplication*) application
{
    ignoreUnused (application);
    JUCEApplicationBase::appWillTerminateByForce();
}

- (void) applicationDidEnterBackground: (UIApplication*) application
{
    if (auto* app = JUCEApplicationBase::getInstance())
    {
       #if JUCE_EXECUTE_APP_SUSPEND_ON_BACKGROUND_TASK
        appSuspendTask = [application beginBackgroundTaskWithName:@"JUCE Suspend Task" expirationHandler:^{
            if (appSuspendTask != UIBackgroundTaskInvalid)
            {
                [application endBackgroundTask:appSuspendTask];
                appSuspendTask = UIBackgroundTaskInvalid;
            }
        }];

        MessageManager::callAsync ([app] { app->suspended(); });
       #else
        ignoreUnused (application);
        app->suspended();
       #endif
    }
}

- (void) applicationWillEnterForeground: (UIApplication*) application
{
    ignoreUnused (application);

    if (auto* app = JUCEApplicationBase::getInstance())
        app->resumed();
}

- (void) applicationDidBecomeActive: (UIApplication*) application
{
    application.applicationIconBadgeNumber = 0;

    isIOSAppActive = true;
}

- (void) applicationWillResignActive: (UIApplication*) application
{
    ignoreUnused (application);
    isIOSAppActive = false;

    for (int i = appBecomingInactiveCallbacks.size(); --i >= 0;)
        appBecomingInactiveCallbacks.getReference(i)->appBecomingInactive();
}

- (void) application: (UIApplication*) application handleEventsForBackgroundURLSession: (NSString*)identifier
   completionHandler: (void (^)(void))completionHandler
{
    ignoreUnused (application);
    URL::DownloadTask::juce_iosURLSessionNotify (nsStringToJuce (identifier));
    completionHandler();
}

- (void) applicationDidReceiveMemoryWarning: (UIApplication*) application
{
    ignoreUnused (application);

    if (auto* app = JUCEApplicationBase::getInstance())
        app->memoryWarningReceived();
}

- (void) setPushNotificationsDelegateToUse: (NSObject*) delegate
{
    _pushNotificationsDelegate = delegate;
}

- (BOOL) application:(UIApplication *)application openURL:(NSURL *)
        url sourceApplication:(NSString *)sourceApplication annotation:(id)
        annotation
{
    if(!JUCEApplicationBase::getInstance())
    {
        [self applicationDidFinishLaunching:application];
    }

    // mostly stolen from didPickDocumentAtURL
    NSUInteger accessOptions = NSFileCoordinatorReadingWithoutChanges;

    auto *fileAccessIntent = [NSFileAccessIntent readingIntentWithURL:url options:accessOptions];

    NSArray<NSFileAccessIntent *> *intents = @[fileAccessIntent];

    auto *fileCoordinator = [[NSFileCoordinator alloc] initWithFilePresenter:nil];

    [fileCoordinator coordinateAccessWithIntents:intents queue:[NSOperationQueue mainQueue] byAccessor:^(NSError *err) {
        if (err == nil) {
            [url startAccessingSecurityScopedResource];

            NSError *error = nil;

            NSData *bookmark = [url bookmarkDataWithOptions:0
                             includingResourceValuesForKeys:nil
                                              relativeToURL:nil
                                                      error:&error];

            [bookmark retain];

            [url stopAccessingSecurityScopedResource];

            URL juceUrl(nsStringToJuce([url absoluteString]));

            if (error == nil) {
                setURLBookmark(juceUrl, (void *) bookmark);
            } else {
                auto *desc = [error localizedDescription];
                ignoreUnused(desc);
                jassertfalse;
            }

            if (auto *app = JUCEApplicationBase::getInstance())
            {
                app->urlOpened(juceUrl);
            }
            else
            {
                jassertfalse;
            }
        } else {
            auto *desc = [err localizedDescription];
            ignoreUnused(desc);
            jassertfalse;
        }
    }];

    return YES;
}

#if JUCE_PUSH_NOTIFICATIONS
- (void) application: (UIApplication*) application didRegisterUserNotificationSettings: (UIUserNotificationSettings*) notificationSettings
{
    ignoreUnused (application);

    SEL selector = @selector (application:didRegisterUserNotificationSettings:);

    if (_pushNotificationsDelegate != nil && [_pushNotificationsDelegate respondsToSelector: selector])
    {
        NSInvocation* invocation = [NSInvocation invocationWithMethodSignature: [_pushNotificationsDelegate methodSignatureForSelector: selector]];
        [invocation setSelector: selector];
        [invocation setTarget: _pushNotificationsDelegate];
        [invocation setArgument: &application          atIndex:2];
        [invocation setArgument: &notificationSettings atIndex:3];

        [invocation invoke];
    }
}

- (void) application: (UIApplication*) application didRegisterForRemoteNotificationsWithDeviceToken: (NSData*) deviceToken
{
    ignoreUnused (application);

    SEL selector = @selector (application:didRegisterForRemoteNotificationsWithDeviceToken:);

    if (_pushNotificationsDelegate != nil && [_pushNotificationsDelegate respondsToSelector: selector])
    {
        NSInvocation* invocation = [NSInvocation invocationWithMethodSignature: [_pushNotificationsDelegate methodSignatureForSelector: selector]];
        [invocation setSelector: selector];
        [invocation setTarget: _pushNotificationsDelegate];
        [invocation setArgument: &application atIndex:2];
        [invocation setArgument: &deviceToken atIndex:3];

        [invocation invoke];
    }
}

- (void) application: (UIApplication*) application didFailToRegisterForRemoteNotificationsWithError: (NSError*) error
{
    ignoreUnused (application);

    SEL selector = @selector (application:didFailToRegisterForRemoteNotificationsWithError:);

    if (_pushNotificationsDelegate != nil && [_pushNotificationsDelegate respondsToSelector: selector])
    {
        NSInvocation* invocation = [NSInvocation invocationWithMethodSignature: [_pushNotificationsDelegate methodSignatureForSelector: selector]];
        [invocation setSelector: selector];
        [invocation setTarget: _pushNotificationsDelegate];
        [invocation setArgument: &application atIndex:2];
        [invocation setArgument: &error       atIndex:3];

        [invocation invoke];
    }
}

- (void) application: (UIApplication*) application didReceiveRemoteNotification: (NSDictionary*) userInfo
{
    ignoreUnused (application);

    SEL selector = @selector (application:didReceiveRemoteNotification:);

    if (_pushNotificationsDelegate != nil && [_pushNotificationsDelegate respondsToSelector: selector])
    {
        NSInvocation* invocation = [NSInvocation invocationWithMethodSignature: [_pushNotificationsDelegate methodSignatureForSelector: selector]];
        [invocation setSelector: selector];
        [invocation setTarget: _pushNotificationsDelegate];
        [invocation setArgument: &application atIndex:2];
        [invocation setArgument: &userInfo    atIndex:3];

        [invocation invoke];
    }
}

- (void) application: (UIApplication*) application didReceiveRemoteNotification: (NSDictionary*) userInfo
  fetchCompletionHandler: (void (^)(UIBackgroundFetchResult result)) completionHandler
{
    ignoreUnused (application);

    SEL selector = @selector (application:didReceiveRemoteNotification:fetchCompletionHandler:);

    if (_pushNotificationsDelegate != nil && [_pushNotificationsDelegate respondsToSelector: selector])
    {
        NSInvocation* invocation = [NSInvocation invocationWithMethodSignature: [_pushNotificationsDelegate methodSignatureForSelector: selector]];
        [invocation setSelector: selector];
        [invocation setTarget: _pushNotificationsDelegate];
        [invocation setArgument: &application       atIndex:2];
        [invocation setArgument: &userInfo          atIndex:3];
        [invocation setArgument: &completionHandler atIndex:4];

        [invocation invoke];
    }
}

- (void) application: (UIApplication*) application handleActionWithIdentifier: (NSString*) identifier
  forRemoteNotification: (NSDictionary*) userInfo withResponseInfo: (NSDictionary*) responseInfo
  completionHandler: (void(^)()) completionHandler
{
    ignoreUnused (application);

    SEL selector = @selector (application:handleActionWithIdentifier:forRemoteNotification:withResponseInfo:completionHandler:);

    if (_pushNotificationsDelegate != nil && [_pushNotificationsDelegate respondsToSelector: selector])
    {
        NSInvocation* invocation = [NSInvocation invocationWithMethodSignature: [_pushNotificationsDelegate methodSignatureForSelector: selector]];
        [invocation setSelector: selector];
        [invocation setTarget: _pushNotificationsDelegate];
        [invocation setArgument: &application       atIndex:2];
        [invocation setArgument: &identifier        atIndex:3];
        [invocation setArgument: &userInfo          atIndex:4];
        [invocation setArgument: &responseInfo      atIndex:5];
        [invocation setArgument: &completionHandler atIndex:6];

        [invocation invoke];
    }
}

- (void) application: (UIApplication*) application didReceiveLocalNotification: (UILocalNotification*) notification
{
    ignoreUnused (application);

    SEL selector = @selector (application:didReceiveLocalNotification:);

    if (_pushNotificationsDelegate != nil && [_pushNotificationsDelegate respondsToSelector: selector])
    {
        NSInvocation* invocation = [NSInvocation invocationWithMethodSignature: [_pushNotificationsDelegate methodSignatureForSelector: selector]];
        [invocation setSelector: selector];
        [invocation setTarget: _pushNotificationsDelegate];
        [invocation setArgument: &application  atIndex:2];
        [invocation setArgument: &notification atIndex:3];

        [invocation invoke];
    }
}

- (void) application: (UIApplication*) application handleActionWithIdentifier: (NSString*) identifier
  forLocalNotification: (UILocalNotification*) notification completionHandler: (void(^)()) completionHandler
{
    ignoreUnused (application);

    SEL selector = @selector (application:handleActionWithIdentifier:forLocalNotification:completionHandler:);

    if (_pushNotificationsDelegate != nil && [_pushNotificationsDelegate respondsToSelector: selector])
    {
        NSInvocation* invocation = [NSInvocation invocationWithMethodSignature: [_pushNotificationsDelegate methodSignatureForSelector: selector]];
        [invocation setSelector: selector];
        [invocation setTarget: _pushNotificationsDelegate];
        [invocation setArgument: &application       atIndex:2];
        [invocation setArgument: &identifier        atIndex:3];
        [invocation setArgument: &notification      atIndex:4];
        [invocation setArgument: &completionHandler atIndex:5];

        [invocation invoke];
    }
}

- (void) application: (UIApplication*) application handleActionWithIdentifier: (NSString*) identifier
  forLocalNotification: (UILocalNotification*) notification withResponseInfo: (NSDictionary*) responseInfo
  completionHandler: (void(^)()) completionHandler
{
    ignoreUnused (application);

    SEL selector = @selector (application:handleActionWithIdentifier:forLocalNotification:withResponseInfo:completionHandler:);

    if (_pushNotificationsDelegate != nil && [_pushNotificationsDelegate respondsToSelector: selector])
    {
        NSInvocation* invocation = [NSInvocation invocationWithMethodSignature: [_pushNotificationsDelegate methodSignatureForSelector: selector]];
        [invocation setSelector: selector];
        [invocation setTarget: _pushNotificationsDelegate];
        [invocation setArgument: &application       atIndex:2];
        [invocation setArgument: &identifier        atIndex:3];
        [invocation setArgument: &notification      atIndex:4];
        [invocation setArgument: &responseInfo      atIndex:5];
        [invocation setArgument: &completionHandler atIndex:6];

        [invocation invoke];
    }
}

#if defined (__IPHONE_10_0) && __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_10_0
- (void) userNotificationCenter: (UNUserNotificationCenter*) center willPresentNotification: (UNNotification*) notification
         withCompletionHandler: (void (^)(UNNotificationPresentationOptions options)) completionHandler
{
    ignoreUnused (center);

    SEL selector = @selector (userNotificationCenter:willPresentNotification:withCompletionHandler:);

    if (_pushNotificationsDelegate != nil && [_pushNotificationsDelegate respondsToSelector: selector])
    {
        NSInvocation* invocation = [NSInvocation invocationWithMethodSignature: [_pushNotificationsDelegate methodSignatureForSelector: selector]];
        [invocation setSelector: selector];
        [invocation setTarget: _pushNotificationsDelegate];
        [invocation setArgument: &center            atIndex:2];
        [invocation setArgument: &notification      atIndex:3];
        [invocation setArgument: &completionHandler atIndex:4];

        [invocation invoke];
    }
}

- (void) userNotificationCenter: (UNUserNotificationCenter*) center didReceiveNotificationResponse: (UNNotificationResponse*) response
         withCompletionHandler: (void(^)()) completionHandler
{
    ignoreUnused (center);

    SEL selector = @selector (userNotificationCenter:didReceiveNotificationResponse:withCompletionHandler:);

    if (_pushNotificationsDelegate != nil && [_pushNotificationsDelegate respondsToSelector: selector])
    {
        NSInvocation* invocation = [NSInvocation invocationWithMethodSignature: [_pushNotificationsDelegate methodSignatureForSelector: selector]];
        [invocation setSelector: selector];
        [invocation setTarget: _pushNotificationsDelegate];
        [invocation setArgument: &center            atIndex:2];
        [invocation setArgument: &response          atIndex:3];
        [invocation setArgument: &completionHandler atIndex:4];

        [invocation invoke];
    }
}
#endif
#endif

@end

namespace juce
{

int juce_iOSMain (int argc, const char* argv[], void* customDelegatePtr);
int juce_iOSMain (int argc, const char* argv[], void* customDelegatePtr)
{
    Class delegateClass = (customDelegatePtr != nullptr ? reinterpret_cast<Class> (customDelegatePtr) : [JuceAppStartupDelegate class]);

    return UIApplicationMain (argc, const_cast<char**> (argv), nil, NSStringFromClass (delegateClass));
}

//==============================================================================
void LookAndFeel::playAlertSound()
{
    // TODO
}

//==============================================================================
class iOSMessageBox
{
public:
    iOSMessageBox (const MessageBoxOptions& opts, std::unique_ptr<ModalComponentManager::Callback>&& cb)
        : callback (std::move (cb))
    {
        if (currentlyFocusedPeer != nullptr)
        {
            UIAlertController* alert = [UIAlertController alertControllerWithTitle: juceStringToNS (opts.getTitle())
                                                                           message: juceStringToNS (opts.getMessage())
                                                                    preferredStyle: UIAlertControllerStyleAlert];

            addButton (alert, opts.getButtonText (0));
            addButton (alert, opts.getButtonText (1));
            addButton (alert, opts.getButtonText (2));

            [currentlyFocusedPeer->controller presentViewController: alert
                                                           animated: YES
                                                         completion: nil];
        }
        else
        {
            // Since iOS8, alert windows need to be associated with a window, so you need to
            // have at least one window on screen when you use this
            jassertfalse;
        }
    }

    int getResult()
    {
        jassert (callback == nullptr);

        JUCE_AUTORELEASEPOOL
        {
            while (result < 0)
                [[NSRunLoop mainRunLoop] runUntilDate: [NSDate dateWithTimeIntervalSinceNow: 0.01]];
        }

        return result;
    }

    void buttonClicked (int buttonIndex) noexcept
    {
        result = buttonIndex;

        if (callback != nullptr)
        {
            callback->modalStateFinished (result);
            delete this;
        }
    }

private:
    void addButton (UIAlertController* alert, const String& text)
    {
        if (! text.isEmpty())
        {
            const auto index = [[alert actions] count];

            [alert addAction: [UIAlertAction actionWithTitle: juceStringToNS (text)
                                                       style: UIAlertActionStyleDefault
                                                     handler: ^(UIAlertAction*) { this->buttonClicked ((int) index); }]];
        }
    }

    int result = -1;
    std::unique_ptr<ModalComponentManager::Callback> callback;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (iOSMessageBox)
};

//==============================================================================
static int showDialog (const MessageBoxOptions& options,
                       ModalComponentManager::Callback* callbackIn,
                       AlertWindowMappings::MapFn mapFn)
{
   #if JUCE_MODAL_LOOPS_PERMITTED
    if (callbackIn == nullptr)
    {
        JUCE_AUTORELEASEPOOL
        {
            jassert (mapFn != nullptr);

            iOSMessageBox messageBox (options, nullptr);
            return mapFn (messageBox.getResult());
        }
    }
   #endif

    new iOSMessageBox (options, AlertWindowMappings::getWrappedCallback (callbackIn, mapFn));
    return 0;
}

#if JUCE_MODAL_LOOPS_PERMITTED
void JUCE_CALLTYPE NativeMessageBox::showMessageBox (MessageBoxIconType /*iconType*/,
                                                     const String& title, const String& message,
                                                     Component* /*associatedComponent*/)
{
    showDialog (MessageBoxOptions()
                  .withTitle (title)
                  .withMessage (message)
                  .withButton (TRANS("OK")),
                nullptr, AlertWindowMappings::messageBox);
}

int JUCE_CALLTYPE NativeMessageBox::show (const MessageBoxOptions& options)
{
    return showDialog (options, nullptr, AlertWindowMappings::noMapping);
}
#endif

void JUCE_CALLTYPE NativeMessageBox::showMessageBoxAsync (MessageBoxIconType /*iconType*/,
                                                          const String& title, const String& message,
                                                          Component* /*associatedComponent*/,
                                                          ModalComponentManager::Callback* callback)
{
    showDialog (MessageBoxOptions()
                  .withTitle (title)
                  .withMessage (message)
                  .withButton (TRANS("OK")),
                callback, AlertWindowMappings::messageBox);
}

bool JUCE_CALLTYPE NativeMessageBox::showOkCancelBox (MessageBoxIconType /*iconType*/,
                                                      const String& title, const String& message,
                                                      Component* /*associatedComponent*/,
                                                      ModalComponentManager::Callback* callback)
{
    return showDialog (MessageBoxOptions()
                         .withTitle (title)
                         .withMessage (message)
                         .withButton (TRANS("OK"))
                         .withButton (TRANS("Cancel")),
                       callback, AlertWindowMappings::okCancel) != 0;
}

int JUCE_CALLTYPE NativeMessageBox::showYesNoCancelBox (MessageBoxIconType /*iconType*/,
                                                        const String& title, const String& message,
                                                        Component* /*associatedComponent*/,
                                                        ModalComponentManager::Callback* callback)
{
    return showDialog (MessageBoxOptions()
                         .withTitle (title)
                         .withMessage (message)
                         .withButton (TRANS("Yes"))
                         .withButton (TRANS("No"))
                         .withButton (TRANS("Cancel")),
                       callback, AlertWindowMappings::yesNoCancel);
}

int JUCE_CALLTYPE NativeMessageBox::showYesNoBox (MessageBoxIconType /*iconType*/,
                                                  const String& title, const String& message,
                                                  Component* /*associatedComponent*/,
                                                  ModalComponentManager::Callback* callback)
{
    return showDialog (MessageBoxOptions()
                         .withTitle (title)
                         .withMessage (message)
                         .withButton (TRANS("Yes"))
                         .withButton (TRANS("No")),
                       callback, AlertWindowMappings::okCancel);
}

void JUCE_CALLTYPE NativeMessageBox::showAsync (const MessageBoxOptions& options,
                                                ModalComponentManager::Callback* callback)
{
    showDialog (options, callback, AlertWindowMappings::noMapping);
}

void JUCE_CALLTYPE NativeMessageBox::showAsync (const MessageBoxOptions& options,
                                                std::function<void (int)> callback)
{
    showAsync (options, ModalCallbackFunction::create (callback));
}

//==============================================================================
bool DragAndDropContainer::performExternalDragDropOfFiles (const StringArray&, bool, Component*, std::function<void()>)
{
    jassertfalse;    // no such thing on iOS!
    return false;
}

bool DragAndDropContainer::performExternalDragDropOfText (const String&, Component*, std::function<void()>)
{
    jassertfalse;    // no such thing on iOS!
    return false;
}

//==============================================================================
void Desktop::setScreenSaverEnabled (const bool isEnabled)
{
    if (! SystemStats::isRunningInAppExtensionSandbox())
        [[UIApplication sharedApplication] setIdleTimerDisabled: ! isEnabled];
}

bool Desktop::isScreenSaverEnabled()
{
    if (SystemStats::isRunningInAppExtensionSandbox())
        return true;

    return ! [[UIApplication sharedApplication] isIdleTimerDisabled];
}

//==============================================================================
bool juce_areThereAnyAlwaysOnTopWindows()
{
    return false;
}

//==============================================================================
Image juce_createIconForFile (const File&)
{
    return Image();
}

//==============================================================================
void SystemClipboard::copyTextToClipboard (const String& text)
{
    [[UIPasteboard generalPasteboard] setValue: juceStringToNS (text)
                             forPasteboardType: @"public.text"];
}

String SystemClipboard::getTextFromClipboard()
{
    id value = [[UIPasteboard generalPasteboard] valueForPasteboardType: @"public.text"];
    if ([value isKindOfClass:[NSString class]]) {
        return nsStringToJuce (value);
    }
    return {};
}

//==============================================================================
bool MouseInputSource::SourceList::addSource()
{
    addSource (sources.size(), MouseInputSource::InputSourceType::touch);
    return true;
}

bool MouseInputSource::SourceList::canUseTouch()
{
    return true;
}

bool Desktop::canUseSemiTransparentWindows() noexcept
{
    return true;
}

bool Desktop::isDarkModeActive() const
{
   #if defined (__IPHONE_12_0) && __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_12_0
    if (@available (iOS 12.0, *))
        return [[[UIScreen mainScreen] traitCollection] userInterfaceStyle] == UIUserInterfaceStyleDark;
   #endif

    return false;
}

class Desktop::NativeDarkModeChangeDetectorImpl
{
public:
    NativeDarkModeChangeDetectorImpl()
    {
        static DelegateClass delegateClass;

        delegate = [delegateClass.createInstance() init];
        object_setInstanceVariable (delegate, "owner", this);

        JUCE_BEGIN_IGNORE_WARNINGS_GCC_LIKE ("-Wundeclared-selector")
        [[NSNotificationCenter defaultCenter] addObserver: delegate
                                                 selector: @selector (darkModeChanged:)
                                                     name: UIViewComponentPeer::getDarkModeNotificationName()
                                                   object: nil];
        JUCE_END_IGNORE_WARNINGS_GCC_LIKE
    }

    ~NativeDarkModeChangeDetectorImpl()
    {
        object_setInstanceVariable (delegate, "owner", nullptr);
        [[NSNotificationCenter defaultCenter] removeObserver: delegate];
        [delegate release];
    }

    void darkModeChanged()
    {
        Desktop::getInstance().darkModeChanged();
    }

private:
    struct DelegateClass  : public ObjCClass<NSObject>
    {
        DelegateClass()  : ObjCClass<NSObject> ("JUCEDelegate_")
        {
            addIvar<NativeDarkModeChangeDetectorImpl*> ("owner");

            JUCE_BEGIN_IGNORE_WARNINGS_GCC_LIKE ("-Wundeclared-selector")
            addMethod (@selector (darkModeChanged:), darkModeChanged, "v@:@");
            JUCE_END_IGNORE_WARNINGS_GCC_LIKE

            registerClass();
        }

        static void darkModeChanged (id self, SEL, NSNotification*)
        {
            if (auto* owner = getIvar<NativeDarkModeChangeDetectorImpl*> (self, "owner"))
                owner->darkModeChanged();
        }
    };

    id delegate = nil;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (NativeDarkModeChangeDetectorImpl)
};

std::unique_ptr<Desktop::NativeDarkModeChangeDetectorImpl> Desktop::createNativeDarkModeChangeDetectorImpl()
{
    return std::make_unique<NativeDarkModeChangeDetectorImpl>();
}

Point<float> MouseInputSource::getCurrentRawMousePosition()
{
    return juce_lastMousePos;
}

void MouseInputSource::setRawMousePosition (Point<float>)
{
}

double Desktop::getDefaultMasterScale()
{
    return 1.0;
}

Desktop::DisplayOrientation Desktop::getCurrentOrientation() const
{
    UIInterfaceOrientation orientation = SystemStats::isRunningInAppExtensionSandbox() ? UIInterfaceOrientationPortrait
                                                                                       : getWindowOrientation();

    return Orientations::convertToJuce (orientation);
}

// The most straightforward way of retrieving the screen area available to an iOS app
// seems to be to create a new window (which will take up all available space) and to
// query its frame.
struct TemporaryWindow
{
    UIWindow* window = [[UIWindow alloc] init];
    ~TemporaryWindow() noexcept { [window release]; }
};

static Rectangle<int> getRecommendedWindowBounds()
{
    return convertToRectInt (TemporaryWindow().window.frame);
}

static BorderSize<int> getSafeAreaInsets (float masterScale)
{
   #if defined (__IPHONE_11_0)
    if (@available (iOS 11.0, *))
    {
        UIEdgeInsets safeInsets = TemporaryWindow().window.safeAreaInsets;

        auto getInset = [&] (CGFloat original) { return roundToInt (original / masterScale); };

        return { getInset (safeInsets.top),    getInset (safeInsets.left),
                 getInset (safeInsets.bottom), getInset (safeInsets.right) };
    }
   #endif

    auto statusBarSize = [UIApplication sharedApplication].statusBarFrame.size;
    auto statusBarHeight = jmin (statusBarSize.width, statusBarSize.height);

    return { roundToInt (statusBarHeight / masterScale), 0, 0, 0 };
}

void Displays::findDisplays (float masterScale)
{
    JUCE_AUTORELEASEPOOL
    {
        UIScreen* s = [UIScreen mainScreen];

        Display d;
        d.totalArea = convertToRectInt ([s bounds]) / masterScale;
        d.userArea = getRecommendedWindowBounds() / masterScale;
        d.safeAreaInsets = getSafeAreaInsets (masterScale);
        d.isMain = true;
        d.scale = masterScale * s.scale;
        d.dpi = 160 * d.scale;

        displays.add (d);
    }
}

} // namespace juce
