/*
 * Copyright (C) 2014-2019 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#import "config.h"
#import "VideoFullscreenInterfaceAVKit.h"

#if PLATFORM(IOS_FAMILY) && ENABLE(VIDEO_PRESENTATION_MODE)

#import "GeometryUtilities.h"
#import "Logging.h"
#import "PictureInPictureSupport.h"
#import "PlaybackSessionInterfaceAVKit.h"
#import "RuntimeApplicationChecks.h"
#import "TimeRanges.h"
#import "VideoFullscreenChangeObserver.h"
#import "VideoFullscreenModel.h"
#import "WebAVPlayerController.h"
#import <AVFoundation/AVTime.h>
#import <UIKit/UIKit.h>
#import <UIKit/UIWindow.h>
#import <objc/message.h>
#import <objc/runtime.h>
#import <pal/spi/cocoa/AVKitSPI.h>
#import <pal/spi/cocoa/QuartzCoreSPI.h>
#import <pal/spi/ios/UIKitSPI.h>
#import <wtf/RefPtr.h>
#import <wtf/RetainPtr.h>
#import <wtf/text/CString.h>
#import <wtf/text/WTFString.h>

using namespace WebCore;

#import <pal/cf/CoreMediaSoftLink.h>
#import <pal/cocoa/AVFoundationSoftLink.h>
#import <pal/ios/UIKitSoftLink.h>

SOFTLINK_AVKIT_FRAMEWORK()
#if HAVE(AVOBSERVATIONCONTROLLER)
SOFT_LINK_CLASS_OPTIONAL(AVKit, AVObservationController)
#endif
SOFT_LINK_CLASS_OPTIONAL(AVKit, AVPictureInPictureController)
SOFT_LINK_CLASS_OPTIONAL(AVKit, AVPlayerViewController)
SOFT_LINK_CLASS_OPTIONAL(AVKit, __AVPlayerLayerView)

@interface UIWindow ()
- (BOOL)_isHostedInAnotherProcess;
@end

@interface UIViewController ()
@property (nonatomic, assign, setter=_setIgnoreAppSupportedOrientations:) BOOL _ignoreAppSupportedOrientations;
@end

static UIColor *clearUIColor()
{
    return (UIColor *)[PAL::getUIColorClass() clearColor];
}

#if !LOG_DISABLED
static const char* boolString(bool val)
{
    return val ? "true" : "false";
}
#endif

static const Seconds defaultWatchdogTimerInterval { 1_s };
static bool ignoreWatchdogForDebugging = false;

@interface AVPlayerViewController (Details)
@property (nonatomic) BOOL showsPlaybackControls;
@property (nonatomic) UIView* view;
@end

@class WebAVMediaSelectionOption;

@interface WebAVPlayerViewControllerDelegate : NSObject <AVPlayerViewControllerDelegate_WebKitOnly> {
    WeakPtr<VideoFullscreenInterfaceAVKit> _fullscreenInterface;
}
@property (assign) VideoFullscreenInterfaceAVKit* fullscreenInterface;
- (BOOL)playerViewController:(AVPlayerViewController *)playerViewController shouldExitFullScreenWithReason:(AVPlayerViewControllerExitFullScreenReason)reason;
@end

@implementation WebAVPlayerViewControllerDelegate
- (VideoFullscreenInterfaceAVKit*)fullscreenInterface
{
    ASSERT(isMainThread());
    return _fullscreenInterface.get();
}

- (void)setFullscreenInterface:(VideoFullscreenInterfaceAVKit*)fullscreenInterface
{
    ASSERT(isMainThread());
    _fullscreenInterface = makeWeakPtr(*fullscreenInterface);
}

- (void)playerViewControllerWillStartPictureInPicture:(AVPlayerViewController *)playerViewController
{
    UNUSED_PARAM(playerViewController);
    self.fullscreenInterface->willStartPictureInPicture();
}

- (void)playerViewControllerDidStartPictureInPicture:(AVPlayerViewController *)playerViewController
{
    UNUSED_PARAM(playerViewController);
    self.fullscreenInterface->didStartPictureInPicture();
}

- (void)playerViewController:(AVPlayerViewController *)playerViewController failedToStartPictureInPictureWithError:(NSError *)error
{
    UNUSED_PARAM(playerViewController);
    UNUSED_PARAM(error);
    self.fullscreenInterface->failedToStartPictureInPicture();
}

- (void)playerViewControllerWillStopPictureInPicture:(AVPlayerViewController *)playerViewController
{
    UNUSED_PARAM(playerViewController);
    self.fullscreenInterface->willStopPictureInPicture();
}

- (void)playerViewControllerDidStopPictureInPicture:(AVPlayerViewController *)playerViewController
{
    UNUSED_PARAM(playerViewController);
    self.fullscreenInterface->didStopPictureInPicture();
}

- (BOOL)playerViewControllerShouldAutomaticallyDismissAtPictureInPictureStart:(AVPlayerViewController *)playerViewController
{
    UNUSED_PARAM(playerViewController);
    return NO;
}

static VideoFullscreenInterfaceAVKit::ExitFullScreenReason convertToExitFullScreenReason(AVPlayerViewControllerExitFullScreenReason reason)
{
    switch (reason) {
    case AVPlayerViewControllerExitFullScreenReasonDoneButtonTapped:
        return VideoFullscreenInterfaceAVKit::ExitFullScreenReason::DoneButtonTapped;
    case AVPlayerViewControllerExitFullScreenReasonFullScreenButtonTapped:
        return VideoFullscreenInterfaceAVKit::ExitFullScreenReason::FullScreenButtonTapped;
    case AVPlayerViewControllerExitFullScreenReasonPictureInPictureStarted:
        return VideoFullscreenInterfaceAVKit::ExitFullScreenReason::PictureInPictureStarted;
    case AVPlayerViewControllerExitFullScreenReasonPinchGestureHandled:
        return VideoFullscreenInterfaceAVKit::ExitFullScreenReason::PinchGestureHandled;
    case AVPlayerViewControllerExitFullScreenReasonRemoteControlStopEventReceived:
        return VideoFullscreenInterfaceAVKit::ExitFullScreenReason::RemoteControlStopEventReceived;
    }
}

- (BOOL)playerViewController:(AVPlayerViewController *)playerViewController shouldExitFullScreenWithReason:(AVPlayerViewControllerExitFullScreenReason)reason
{
    UNUSED_PARAM(playerViewController);
    return self.fullscreenInterface->shouldExitFullscreenWithReason(convertToExitFullScreenReason(reason));
}

- (void)playerViewController:(AVPlayerViewController *)playerViewController restoreUserInterfaceForPictureInPictureStopWithCompletionHandler:(void (^)(BOOL restored))completionHandler
{
    UNUSED_PARAM(playerViewController);
    self.fullscreenInterface->prepareForPictureInPictureStopWithCompletionHandler(completionHandler);
}

- (BOOL)playerViewControllerShouldStartPictureInPictureFromInlineWhenEnteringBackground:(AVPlayerViewController *)playerViewController
{
    UNUSED_PARAM(playerViewController);
    return YES;
}

@end

@interface WebAVPlayerLayer : CALayer
@property (nonatomic, retain) NSString *videoGravity;
@property (nonatomic, getter=isReadyForDisplay) BOOL readyForDisplay;
@property (nonatomic, assign) VideoFullscreenInterfaceAVKit* fullscreenInterface;
@property (nonatomic, retain) AVPlayerController *playerController;
@property (nonatomic, retain) CALayer *videoSublayer;
@property (nonatomic, copy, nullable) NSDictionary *pixelBufferAttributes;
@property CGSize videoDimensions;
@property CGRect modelVideoLayerFrame;
@end

@implementation WebAVPlayerLayer {
    RefPtr<VideoFullscreenInterfaceAVKit> _fullscreenInterface;
    RetainPtr<WebAVPlayerController> _avPlayerController;
    RetainPtr<CALayer> _videoSublayer;
    RetainPtr<NSString> _videoGravity;
}

- (instancetype)init
{
    self = [super init];
    if (self) {
        self.masksToBounds = YES;
        self.allowsHitTesting = NO;
        _videoGravity = AVLayerVideoGravityResizeAspect;
    }
    return self;
}

- (void)dealloc
{
    [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(resolveBounds) object:nil];
    [_pixelBufferAttributes release];
    [super dealloc];
}

- (VideoFullscreenInterfaceAVKit*)fullscreenInterface
{
    return _fullscreenInterface.get();
}

- (void)setFullscreenInterface:(VideoFullscreenInterfaceAVKit*)fullscreenInterface
{
    _fullscreenInterface = fullscreenInterface;
}

- (AVPlayerController *)playerController
{
    return (AVPlayerController *)_avPlayerController.get();
}

- (void)setPlayerController:(AVPlayerController *)playerController
{
    ASSERT(!playerController || [playerController isKindOfClass:[WebAVPlayerController class]]);
    _avPlayerController = (WebAVPlayerController *)playerController;
}

- (void)setVideoSublayer:(CALayer *)videoSublayer
{
    _videoSublayer = videoSublayer;
}

- (CALayer*)videoSublayer
{
    return _videoSublayer.get();
}

- (void)layoutSublayers
{
    if ([_videoSublayer superlayer] != self)
        return;

    if (![_avPlayerController delegate])
        return;

    [_videoSublayer setPosition:CGPointMake(CGRectGetMidX(self.bounds), CGRectGetMidY(self.bounds))];

    if (self.videoDimensions.height <= 0 || self.videoDimensions.width <= 0)
        return;

    FloatRect sourceVideoFrame;
    FloatRect targetVideoFrame;
    float videoAspectRatio = self.videoDimensions.width / self.videoDimensions.height;
    
    if ([AVLayerVideoGravityResize isEqualToString:self.videoGravity]) {
        sourceVideoFrame = self.modelVideoLayerFrame;
        targetVideoFrame = self.bounds;
    } else if ([AVLayerVideoGravityResizeAspect isEqualToString:self.videoGravity]) {
        sourceVideoFrame = largestRectWithAspectRatioInsideRect(videoAspectRatio, self.modelVideoLayerFrame);
        targetVideoFrame = largestRectWithAspectRatioInsideRect(videoAspectRatio, self.bounds);
    } else if ([AVLayerVideoGravityResizeAspectFill isEqualToString:self.videoGravity]) {
        sourceVideoFrame = smallestRectWithAspectRatioAroundRect(videoAspectRatio, self.modelVideoLayerFrame);
        targetVideoFrame = smallestRectWithAspectRatioAroundRect(videoAspectRatio, self.bounds);
    } else
        ASSERT_NOT_REACHED();

    UIView *view = (UIView *)[_videoSublayer delegate];
    CGAffineTransform transform = CGAffineTransformMakeScale(targetVideoFrame.width() / sourceVideoFrame.width(), targetVideoFrame.height() / sourceVideoFrame.height());
    [view setTransform:transform];
    
    NSTimeInterval animationDuration = [CATransaction animationDuration];
    dispatch_async(dispatch_get_main_queue(), ^{
        [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(resolveBounds) object:nil];

        [self performSelector:@selector(resolveBounds) withObject:nil afterDelay:animationDuration + 0.1];
    });
}

- (void)resolveBounds
{
    [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(resolveBounds) object:nil];
    if (![_avPlayerController delegate])
        return;
    
    if ([_videoSublayer superlayer] != self)
        return;
    
    if (CGRectEqualToRect(self.modelVideoLayerFrame, [self bounds]) && CGAffineTransformIsIdentity([(UIView *)[_videoSublayer delegate] transform]))
        return;
    
    [CATransaction begin];
    [CATransaction setAnimationDuration:0];
    [CATransaction setDisableActions:YES];
    
    if (!CGRectEqualToRect(self.modelVideoLayerFrame, [self bounds])) {
        self.modelVideoLayerFrame = [self bounds];
        if (auto* model = _fullscreenInterface->videoFullscreenModel())
            model->setVideoLayerFrame(self.modelVideoLayerFrame);
    }
    [(UIView *)[_videoSublayer delegate] setTransform:CGAffineTransformIdentity];
    
    [CATransaction commit];
}

- (void)setVideoGravity:(NSString *)videoGravity
{
#if PLATFORM(MACCATALYST)
    // FIXME<rdar://46011230>: remove this #if once this radar lands.
    if (!videoGravity)
        videoGravity = AVLayerVideoGravityResizeAspect;
#endif

    _videoGravity = videoGravity;
    
    if (![_avPlayerController delegate])
        return;

    MediaPlayerEnums::VideoGravity gravity = MediaPlayerEnums::VideoGravity::ResizeAspect;
    if (videoGravity == AVLayerVideoGravityResize)
        gravity = MediaPlayerEnums::VideoGravity::Resize;
    if (videoGravity == AVLayerVideoGravityResizeAspect)
        gravity = MediaPlayerEnums::VideoGravity::ResizeAspect;
    else if (videoGravity == AVLayerVideoGravityResizeAspectFill)
        gravity = MediaPlayerEnums::VideoGravity::ResizeAspectFill;
    else
        ASSERT_NOT_REACHED();
    
    if (auto* model = _fullscreenInterface->videoFullscreenModel())
        model->setVideoLayerGravity(gravity);
}

- (NSString *)videoGravity
{
    return _videoGravity.get();
}

- (CGRect)videoRect
{
    if (self.videoDimensions.width <= 0 || self.videoDimensions.height <= 0)
        return self.bounds;
    
    float videoAspectRatio = self.videoDimensions.width / self.videoDimensions.height;

    if ([AVLayerVideoGravityResizeAspect isEqualToString:self.videoGravity])
        return largestRectWithAspectRatioInsideRect(videoAspectRatio, self.bounds);
    if ([AVLayerVideoGravityResizeAspectFill isEqualToString:self.videoGravity])
        return smallestRectWithAspectRatioAroundRect(videoAspectRatio, self.bounds);

    return self.bounds;
}

+ (NSSet *)keyPathsForValuesAffectingVideoRect
{
    return [NSSet setWithObjects:@"videoDimensions", @"videoGravity", nil];
}

@end

@interface WebAVPictureInPicturePlayerLayerView : UIView
@end

static Class WebAVPictureInPicturePlayerLayerView_layerClass(id, SEL)
{
    return [WebAVPlayerLayer class];
}

static WebAVPictureInPicturePlayerLayerView *allocWebAVPictureInPicturePlayerLayerViewInstance()
{
    static Class theClass = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        theClass = objc_allocateClassPair(PAL::getUIViewClass(), "WebAVPictureInPicturePlayerLayerView", 0);
        objc_registerClassPair(theClass);
        Class metaClass = objc_getMetaClass("WebAVPictureInPicturePlayerLayerView");
        class_addMethod(metaClass, @selector(layerClass), (IMP)WebAVPictureInPicturePlayerLayerView_layerClass, "@@:");
    });
    
    return (WebAVPictureInPicturePlayerLayerView *)[theClass alloc];
}

@interface WebAVPlayerLayerView : __AVPlayerLayerView
@property (retain) UIView* videoView;
@end

static Class WebAVPlayerLayerView_layerClass(id, SEL)
{
    return [WebAVPlayerLayer class];
}

static AVPlayerController *WebAVPlayerLayerView_playerController(id aSelf, SEL)
{
    __AVPlayerLayerView *playerLayer = aSelf;
    WebAVPlayerLayer *webAVPlayerLayer = (WebAVPlayerLayer *)[playerLayer playerLayer];
    return [webAVPlayerLayer playerController];
}

static void WebAVPlayerLayerView_setPlayerController(id aSelf, SEL, AVPlayerController *playerController)
{
    __AVPlayerLayerView *playerLayerView = aSelf;
    WebAVPlayerLayer *webAVPlayerLayer = (WebAVPlayerLayer *)[playerLayerView playerLayer];
    [webAVPlayerLayer setPlayerController: playerController];
}

static AVPlayerLayer *WebAVPlayerLayerView_playerLayer(id aSelf, SEL)
{
    __AVPlayerLayerView *playerLayerView = aSelf;

    if ([get__AVPlayerLayerViewClass() instancesRespondToSelector:@selector(playerLayer)]) {
        objc_super superClass { playerLayerView, get__AVPlayerLayerViewClass() };
        auto superClassMethod = reinterpret_cast<AVPlayerLayer *(*)(objc_super *, SEL)>(objc_msgSendSuper);
        return superClassMethod(&superClass, @selector(playerLayer));
    }

    return (AVPlayerLayer *)[playerLayerView layer];
}

static UIView *WebAVPlayerLayerView_videoView(id aSelf, SEL)
{
    __AVPlayerLayerView *playerLayerView = aSelf;
    WebAVPlayerLayer *webAVPlayerLayer = (WebAVPlayerLayer *)[playerLayerView playerLayer];
    CALayer* videoLayer = [webAVPlayerLayer videoSublayer];
    if (!videoLayer || !videoLayer.delegate)
        return nil;
    ASSERT([[videoLayer delegate] isKindOfClass:PAL::getUIViewClass()]);
    return (UIView *)[videoLayer delegate];
}

static void WebAVPlayerLayerView_setVideoView(id aSelf, SEL, UIView *videoView)
{
    __AVPlayerLayerView *playerLayerView = aSelf;
    WebAVPlayerLayer *webAVPlayerLayer = (WebAVPlayerLayer *)[playerLayerView playerLayer];
    [webAVPlayerLayer setVideoSublayer:[videoView layer]];
}

static void WebAVPlayerLayerView_startRoutingVideoToPictureInPicturePlayerLayerView(id aSelf, SEL)
{
    WebAVPlayerLayerView *playerLayerView = aSelf;
    WebAVPictureInPicturePlayerLayerView *pipView = (WebAVPictureInPicturePlayerLayerView *)[playerLayerView pictureInPicturePlayerLayerView];

    WebAVPlayerLayer *playerLayer = (WebAVPlayerLayer *)[playerLayerView playerLayer];
    WebAVPlayerLayer *pipPlayerLayer = (WebAVPlayerLayer *)[pipView layer];
    [playerLayer setVideoGravity:AVLayerVideoGravityResizeAspect];
    [pipPlayerLayer setVideoSublayer:playerLayer.videoSublayer];
    [pipPlayerLayer setVideoDimensions:playerLayer.videoDimensions];
    [pipPlayerLayer setVideoGravity:playerLayer.videoGravity];
    [pipPlayerLayer setModelVideoLayerFrame:playerLayer.modelVideoLayerFrame];
    [pipPlayerLayer setPlayerController:playerLayer.playerController];
    [pipPlayerLayer setFullscreenInterface:playerLayer.fullscreenInterface];
    [pipView addSubview:playerLayerView.videoView];
}

static void WebAVPlayerLayerView_stopRoutingVideoToPictureInPicturePlayerLayerView(id aSelf, SEL)
{
    WebAVPlayerLayerView *playerLayerView = aSelf;
    if (UIView *videoView = playerLayerView.videoView)
        [playerLayerView addSubview:videoView];
    WebAVPictureInPicturePlayerLayerView *pipView = (WebAVPictureInPicturePlayerLayerView *)[playerLayerView pictureInPicturePlayerLayerView];
    WebAVPlayerLayer *playerLayer = (WebAVPlayerLayer *)[playerLayerView playerLayer];
    WebAVPlayerLayer *pipPlayerLayer = (WebAVPlayerLayer *)[pipView layer];
    [playerLayer setModelVideoLayerFrame:pipPlayerLayer.modelVideoLayerFrame];
}

static WebAVPictureInPicturePlayerLayerView *WebAVPlayerLayerView_pictureInPicturePlayerLayerView(id aSelf, SEL)
{
    WebAVPlayerLayerView *playerLayerView = aSelf;
    WebAVPictureInPicturePlayerLayerView *pipView = [playerLayerView valueForKey:@"_pictureInPicturePlayerLayerView"];
    if (!pipView) {
        pipView = [allocWebAVPictureInPicturePlayerLayerViewInstance() initWithFrame:CGRectZero];
        [playerLayerView setValue:pipView forKey:@"_pictureInPicturePlayerLayerView"];
    }
    return pipView;
}

static void WebAVPlayerLayerView_dealloc(id aSelf, SEL)
{
    WebAVPlayerLayerView *playerLayerView = aSelf;
    RetainPtr<WebAVPictureInPicturePlayerLayerView> pipView = adoptNS([playerLayerView valueForKey:@"_pictureInPicturePlayerLayerView"]);
    [playerLayerView setValue:nil forKey:@"_pictureInPicturePlayerLayerView"];
    objc_super superClass { playerLayerView, get__AVPlayerLayerViewClass() };
    auto super_dealloc = reinterpret_cast<void(*)(objc_super*, SEL)>(objc_msgSendSuper);
    super_dealloc(&superClass, @selector(dealloc));
}

#pragma mark - Methods

static WebAVPlayerLayerView *allocWebAVPlayerLayerViewInstance()
{
    static Class theClass = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        ASSERT(get__AVPlayerLayerViewClass());
        theClass = objc_allocateClassPair(get__AVPlayerLayerViewClass(), "WebAVPlayerLayerView", 0);
        class_addMethod(theClass, @selector(dealloc), (IMP)WebAVPlayerLayerView_dealloc, "v@:");
        class_addMethod(theClass, @selector(setPlayerController:), (IMP)WebAVPlayerLayerView_setPlayerController, "v@:@");
        class_addMethod(theClass, @selector(playerController), (IMP)WebAVPlayerLayerView_playerController, "@@:");
        class_addMethod(theClass, @selector(setVideoView:), (IMP)WebAVPlayerLayerView_setVideoView, "v@:@");
        class_addMethod(theClass, @selector(videoView), (IMP)WebAVPlayerLayerView_videoView, "@@:");
        class_addMethod(theClass, @selector(playerLayer), (IMP)WebAVPlayerLayerView_playerLayer, "@@:");
        class_addMethod(theClass, @selector(startRoutingVideoToPictureInPicturePlayerLayerView), (IMP)WebAVPlayerLayerView_startRoutingVideoToPictureInPicturePlayerLayerView, "v@:");
        class_addMethod(theClass, @selector(stopRoutingVideoToPictureInPicturePlayerLayerView), (IMP)WebAVPlayerLayerView_stopRoutingVideoToPictureInPicturePlayerLayerView, "v@:");
        class_addMethod(theClass, @selector(pictureInPicturePlayerLayerView), (IMP)WebAVPlayerLayerView_pictureInPicturePlayerLayerView, "@@:");
        
        class_addIvar(theClass, "_pictureInPicturePlayerLayerView", sizeof(WebAVPictureInPicturePlayerLayerView *), log2(sizeof(WebAVPictureInPicturePlayerLayerView *)), "@");
        
        objc_registerClassPair(theClass);
        Class metaClass = objc_getMetaClass("WebAVPlayerLayerView");
        class_addMethod(metaClass, @selector(layerClass), (IMP)WebAVPlayerLayerView_layerClass, "@@:");
    });
    return (WebAVPlayerLayerView *)[theClass alloc];
}

NS_ASSUME_NONNULL_BEGIN
@interface WebAVPlayerViewController : NSObject<AVPlayerViewControllerDelegate>
- (instancetype)initWithFullscreenInterface:(VideoFullscreenInterfaceAVKit *)interface;
- (void)enterFullScreenAnimated:(BOOL)animated completionHandler:(void (^)(BOOL success, NSError *))completionHandler;
- (void)exitFullScreenAnimated:(BOOL)animated completionHandler:(void (^)(BOOL success, NSError *))completionHandler;
- (void)startPictureInPicture;
- (void)stopPictureInPicture;

- (BOOL)playerViewControllerShouldHandleDoneButtonTap:(AVPlayerViewController *)playerViewController;
- (void)setWebKitOverrideRouteSharingPolicy:(NSUInteger)routeSharingPolicy routingContextUID:(NSString *)routingContextUID;
@end
NS_ASSUME_NONNULL_END

@implementation WebAVPlayerViewController {
    VideoFullscreenInterfaceAVKit *_fullscreenInterface;
    RetainPtr<UIViewController> _presentingViewController;
    RetainPtr<AVPlayerViewController> _avPlayerViewController;
#if HAVE(AVOBSERVATIONCONTROLLER)
    RetainPtr<NSTimer> _startPictureInPictureTimer;
    RetainPtr<AVObservationController> _avPlayerViewControllerObservationController;
#endif
    id<AVPlayerViewControllerDelegate_WebKitOnly> _delegate;
}

- (instancetype)initWithFullscreenInterface:(VideoFullscreenInterfaceAVKit *)interface
{
    if (!(self = [super init]))
        return nil;

    _fullscreenInterface = interface;
    _avPlayerViewController = adoptNS([allocAVPlayerViewControllerInstance() initWithPlayerLayerView:interface->playerLayerView()]);
    _avPlayerViewController.get().modalPresentationStyle = UIModalPresentationOverFullScreen;
#if HAVE(AVOBSERVATIONCONTROLLER)
    _avPlayerViewControllerObservationController = adoptNS([allocAVObservationControllerInstance() initWithOwner:_avPlayerViewController.get()]);
#endif
#if PLATFORM(WATCHOS)
    _avPlayerViewController.get().delegate = self;
#endif

    return self;
}

#if HAVE(AVOBSERVATIONCONTROLLER)
- (void)dealloc
{
    [_startPictureInPictureTimer invalidate];
    _startPictureInPictureTimer = nil;
    [_avPlayerViewControllerObservationController stopAllObservation];
    _avPlayerViewControllerObservationController = nil;

    [super dealloc];
}
#endif

- (BOOL)playerViewControllerShouldHandleDoneButtonTap:(AVPlayerViewController *)playerViewController
{
    ASSERT(playerViewController == _avPlayerViewController.get());
    if (_delegate)
        return [_delegate playerViewController:playerViewController shouldExitFullScreenWithReason:AVPlayerViewControllerExitFullScreenReasonDoneButtonTapped];

    return YES;
}

- (void)setWebKitOverrideRouteSharingPolicy:(NSUInteger)routeSharingPolicy routingContextUID:(NSString *)routingContextUID
{
    ALLOW_NEW_API_WITHOUT_GUARDS_BEGIN
    if ([_avPlayerViewController respondsToSelector:@selector(setWebKitOverrideRouteSharingPolicy:routingContextUID:)])
        [_avPlayerViewController setWebKitOverrideRouteSharingPolicy:routeSharingPolicy routingContextUID:routingContextUID];
    ALLOW_NEW_API_WITHOUT_GUARDS_END
}

- (void)enterFullScreenAnimated:(BOOL)animated completionHandler:(void (^)(BOOL success, NSError * __nullable error))completionHandler
{
#if PLATFORM(WATCHOS)
    _presentingViewController = _fullscreenInterface->presentingViewController();

    _avPlayerViewController.get().view.frame = _presentingViewController.get().view.frame;
    [_presentingViewController presentViewController:_fullscreenInterface->fullscreenViewController() animated:animated completion:^{
        if (completionHandler)
            completionHandler(YES, nil);
    }];
#else
    [_avPlayerViewController.get() enterFullScreenAnimated:animated completionHandler:completionHandler];
#endif
}

- (void)exitFullScreenAnimated:(BOOL)animated completionHandler:(void (^)(BOOL success, NSError * __nullable error))completionHandler
{
#if PLATFORM(WATCHOS)
    if (!_presentingViewController)
        return;

    [_presentingViewController dismissViewControllerAnimated:animated completion:^{
        _presentingViewController = nil;
        if (completionHandler)
            completionHandler(YES, nil);
    }];
#else
    [_avPlayerViewController.get() exitFullScreenAnimated:animated completionHandler:completionHandler];
#endif
}

#if PLATFORM(WATCHOS)
#define MY_NO_RETURN NO_RETURN_DUE_TO_ASSERT
#else
#define MY_NO_RETURN
#endif

#if HAVE(AVOBSERVATIONCONTROLLER)
static const NSTimeInterval startPictureInPictureTimeInterval = 0.5;

- (void)tryToStartPictureInPicture MY_NO_RETURN
{
    if (_startPictureInPictureTimer)
        return;

    _startPictureInPictureTimer = [NSTimer scheduledTimerWithTimeInterval:startPictureInPictureTimeInterval repeats:NO block:^(NSTimer *_Nonnull) {
        [_avPlayerViewControllerObservationController stopAllObservation];
        _startPictureInPictureTimer = nil;
        if (_fullscreenInterface)
            _fullscreenInterface->failedToStartPictureInPicture();
    }];

    [_avPlayerViewControllerObservationController startObserving:_avPlayerViewController.get() keyPath:@"pictureInPicturePossible" includeInitialValue:YES observationHandler:^(id _Nonnull, id _Nonnull, id _Nonnull) {
        if ([self isPictureInPicturePossible] && _startPictureInPictureTimer) {
            [_avPlayerViewControllerObservationController stopAllObservation];
            [_startPictureInPictureTimer invalidate];
            _startPictureInPictureTimer = nil;
            [self startPictureInPicture];
        }
    }];
}
#endif

- (void)startPictureInPicture MY_NO_RETURN
{
#if PLATFORM(WATCHOS)
    ASSERT_NOT_REACHED();
#else
    [_avPlayerViewController.get() startPictureInPicture];
#endif
}

- (void)stopPictureInPicture MY_NO_RETURN
{
#if PLATFORM(WATCHOS)
    ASSERT_NOT_REACHED();
#else
    [_avPlayerViewController.get() stopPictureInPicture];
#endif
}

- (BOOL)isPictureInPicturePossible
{
#if PLATFORM(WATCHOS)
    return NO;
#else
    return _avPlayerViewController.get().isPictureInPicturePossible;
#endif
}

- (BOOL)isPictureInPictureActive
{
#if PLATFORM(WATCHOS)
    return NO;
#else
    return _avPlayerViewController.get().isPictureInPictureActive;
#endif
}

- (BOOL)pictureInPictureActive
{
#if PLATFORM(WATCHOS)
    return NO;
#else
    return _avPlayerViewController.get().pictureInPictureActive;
#endif
}

- (BOOL)pictureInPictureWasStartedWhenEnteringBackground
{
#if PLATFORM(WATCHOS)
    return NO;
#else
    return _avPlayerViewController.get().pictureInPictureWasStartedWhenEnteringBackground;
#endif
}

- (UIView *) view
{
    return _avPlayerViewController.get().view;
}

- (BOOL)showsPlaybackControls
{
#if PLATFORM(WATCHOS)
    return YES;
#else
    return _avPlayerViewController.get().showsPlaybackControls;
#endif
}

- (void)setShowsPlaybackControls:(BOOL)showsPlaybackControls
{
#if PLATFORM(WATCHOS)
    UNUSED_PARAM(showsPlaybackControls);
#else
    _avPlayerViewController.get().showsPlaybackControls = showsPlaybackControls;
#endif
}

- (void)setAllowsPictureInPicturePlayback:(BOOL)allowsPictureInPicturePlayback
{
#if PLATFORM(WATCHOS)
    UNUSED_PARAM(allowsPictureInPicturePlayback);
#else
    _avPlayerViewController.get().allowsPictureInPicturePlayback = allowsPictureInPicturePlayback;
#endif
}

- (void)setDelegate:(id <AVPlayerViewControllerDelegate>)delegate
{
#if PLATFORM(WATCHOS)
    ASSERT(!delegate || [delegate respondsToSelector:@selector(playerViewController:shouldExitFullScreenWithReason:)]);
    _delegate = id<AVPlayerViewControllerDelegate_WebKitOnly>(delegate);
#else
    _avPlayerViewController.get().delegate = delegate;
#endif
}

- (void)setPlayerController:(AVPlayerController *)playerController
{
    _avPlayerViewController.get().playerController = playerController;
}

- (AVPlayerViewController *) avPlayerViewController
{
    return _avPlayerViewController.get();
}

- (void)removeFromParentViewController
{
    [_avPlayerViewController.get() removeFromParentViewController];
}
@end

Ref<VideoFullscreenInterfaceAVKit> VideoFullscreenInterfaceAVKit::create(PlaybackSessionInterfaceAVKit& playbackSessionInterface)
{
    Ref<VideoFullscreenInterfaceAVKit> interface = adoptRef(*new VideoFullscreenInterfaceAVKit(playbackSessionInterface));
    [interface->m_playerViewControllerDelegate setFullscreenInterface:interface.ptr()];
    return interface;
}

VideoFullscreenInterfaceAVKit::VideoFullscreenInterfaceAVKit(PlaybackSessionInterfaceAVKit& playbackSessionInterface)
    : m_playbackSessionInterface(playbackSessionInterface)
    , m_playerViewControllerDelegate(adoptNS([[WebAVPlayerViewControllerDelegate alloc] init]))
    , m_watchdogTimer(RunLoop::main(), this, &VideoFullscreenInterfaceAVKit::watchdogTimerFired)
{
}

VideoFullscreenInterfaceAVKit::~VideoFullscreenInterfaceAVKit()
{
    WebAVPlayerController* playerController = this->playerController();
    if (playerController && playerController.externalPlaybackActive)
        externalPlaybackChanged(false, PlaybackSessionModel::TargetTypeNone, "");
    if (m_videoFullscreenModel)
        m_videoFullscreenModel->removeClient(*this);
}

WebAVPlayerController *VideoFullscreenInterfaceAVKit::playerController() const
{
    return m_playbackSessionInterface->playerController();
}

void VideoFullscreenInterfaceAVKit::setVideoFullscreenModel(VideoFullscreenModel* model)
{
    if (m_videoFullscreenModel)
        m_videoFullscreenModel->removeClient(*this);

    m_videoFullscreenModel = model;

    if (m_videoFullscreenModel) {
        m_videoFullscreenModel->addClient(*this);
        m_videoFullscreenModel->requestRouteSharingPolicyAndContextUID([this, protectedThis = makeRefPtr(this)] (RouteSharingPolicy policy, String contextUID) {
            m_routeSharingPolicy = policy;
            m_routingContextUID = contextUID;

            if (m_playerViewController && !m_routingContextUID.isEmpty())
                [m_playerViewController setWebKitOverrideRouteSharingPolicy:(NSUInteger)m_routeSharingPolicy routingContextUID:m_routingContextUID];
        });
    }

    hasVideoChanged(m_videoFullscreenModel ? m_videoFullscreenModel->hasVideo() : false);
    videoDimensionsChanged(m_videoFullscreenModel ? m_videoFullscreenModel->videoDimensions() : FloatSize());
}

void VideoFullscreenInterfaceAVKit::setVideoFullscreenChangeObserver(VideoFullscreenChangeObserver* observer)
{
    m_fullscreenChangeObserver = observer;
}

void VideoFullscreenInterfaceAVKit::hasVideoChanged(bool hasVideo)
{
    [playerController() setHasEnabledVideo:hasVideo];
    [playerController() setHasVideo:hasVideo];
}

void VideoFullscreenInterfaceAVKit::videoDimensionsChanged(const FloatSize& videoDimensions)
{
    if (videoDimensions.isZero())
        return;
    
    WebAVPlayerLayer *playerLayer = (WebAVPlayerLayer *)[m_playerLayerView playerLayer];

    [playerLayer setVideoDimensions:videoDimensions];
    [playerController() setContentDimensions:videoDimensions];
    [m_playerLayerView setNeedsLayout];

    WebAVPictureInPicturePlayerLayerView *pipView = (WebAVPictureInPicturePlayerLayerView *)[m_playerLayerView pictureInPicturePlayerLayerView];
    WebAVPlayerLayer *pipPlayerLayer = (WebAVPlayerLayer *)[pipView layer];
    [pipPlayerLayer setVideoDimensions:playerLayer.videoDimensions];
    [pipView setNeedsLayout];
}

void VideoFullscreenInterfaceAVKit::externalPlaybackChanged(bool enabled, PlaybackSessionModel::ExternalPlaybackTargetType, const String&)
{
    [m_playerLayerView setHidden:enabled];
}

bool VideoFullscreenInterfaceAVKit::pictureInPictureWasStartedWhenEnteringBackground() const
{
    return [m_playerViewController pictureInPictureWasStartedWhenEnteringBackground];
}

static UIViewController *fallbackViewController(UIView *view)
{
    for (UIView *currentView = view; currentView; currentView = currentView.superview) {
        if (UIViewController *viewController = [PAL::getUIViewControllerClass() viewControllerForView:currentView]) {
            if (![viewController parentViewController])
                return viewController;
        }
    }

    LOG_ERROR("Failed to find a view controller suitable to present fullscreen video");
    return nil;
}

UIViewController *VideoFullscreenInterfaceAVKit::presentingViewController()
{
    auto *controller = videoFullscreenModel() ? videoFullscreenModel()->presentingViewController() : nil;
    if (!controller)
        controller = fallbackViewController(m_parentView.get());

    return controller;
}

void VideoFullscreenInterfaceAVKit::applicationDidBecomeActive()
{
    LOG(Fullscreen, "VideoFullscreenInterfaceAVKit::applicationDidBecomeActive(%p)", this);
}

void VideoFullscreenInterfaceAVKit::setupFullscreen(UIView& videoView, const IntRect& initialRect, const FloatSize& videoDimensions, UIView* parentView, HTMLMediaElementEnums::VideoFullscreenMode mode, bool allowsPictureInPicturePlayback, bool standby)
{
    ASSERT(standby || mode != HTMLMediaElementEnums::VideoFullscreenModeNone);
    LOG(Fullscreen, "VideoFullscreenInterfaceAVKit::setupFullscreen(%p)", this);

    [playerController() setHasEnabledVideo:true];
    [playerController() setHasVideo:true];
    [playerController() setContentDimensions:videoDimensions];

    m_allowsPictureInPicturePlayback = allowsPictureInPicturePlayback;
    m_videoView = &videoView;
    m_parentView = parentView;
    m_parentWindow = parentView.window;

    m_targetStandby = standby;
    m_targetMode = mode;
    setInlineRect(initialRect, true);
    doSetup();
}

void VideoFullscreenInterfaceAVKit::enterFullscreen()
{
    LOG(Fullscreen, "VideoFullscreenInterfaceAVKit::enterFullscreen(%p) %d", this, mode());

    doEnterFullscreen();
}

void VideoFullscreenInterfaceAVKit::exitFullscreen(const IntRect& finalRect)
{
    if (m_watchdogTimer.isActive())
        m_watchdogTimer.stop();

    if (m_enteringPictureInPicture)
        return;

    m_targetMode = HTMLMediaElementEnums::VideoFullscreenModeNone;

    setInlineRect(finalRect, true);
    doExitFullscreen();
    m_shouldIgnoreAVKitCallbackAboutExitFullscreenReason = true;
}

void VideoFullscreenInterfaceAVKit::cleanupFullscreen()
{
    LOG(Fullscreen, "VideoFullscreenInterfaceAVKit::cleanupFullscreen(%p)", this);
    m_shouldIgnoreAVKitCallbackAboutExitFullscreenReason = false;

    if (m_enteringPictureInPicture)
        return;

    m_cleanupNeedsReturnVideoContentLayer = true;
    if (m_hasVideoContentLayer && m_fullscreenChangeObserver) {
        m_fullscreenChangeObserver->returnVideoContentLayer();
        return;
    }
    m_cleanupNeedsReturnVideoContentLayer = false;

    if (m_window) {
        [m_window setHidden:YES];
        [m_window setRootViewController:nil];
    }
    
    [m_playerViewController setDelegate:nil];
    [m_playerViewController setPlayerController:nil];
    
    if (m_currentMode.hasPictureInPicture()) {
        [m_playerViewController stopPictureInPicture];

        if (m_videoFullscreenModel)
            m_videoFullscreenModel->didExitPictureInPicture();
    }

    if (m_currentMode.hasFullscreen()) {
        [[m_playerViewController view] layoutIfNeeded];
        [m_playerViewController exitFullScreenAnimated:NO completionHandler:[] (BOOL success, NSError* error) {
            if (!success)
                WTFLogAlways("-[AVPlayerViewController exitFullScreenAnimated:completionHandler:] failed with error %s", [[error localizedDescription] UTF8String]);
        }];
    }
    
    [[m_playerViewController view] removeFromSuperview];
    if (m_viewController)
        [m_playerViewController removeFromParentViewController];
    
    [m_playerLayerView removeFromSuperview];
    [[m_viewController view] removeFromSuperview];

    m_playerLayerView = nil;
    m_playerViewController = nil;
    m_window = nil;
    m_videoView = nil;
    m_parentView = nil;
    m_parentWindow = nil;
    
    if (m_fullscreenChangeObserver)
        m_fullscreenChangeObserver->didCleanupFullscreen();

    [playerController() setHasEnabledVideo:false];
    [playerController() setHasVideo:false];
}

void VideoFullscreenInterfaceAVKit::invalidate()
{
    m_videoFullscreenModel = nullptr;
    m_fullscreenChangeObserver = nullptr;
    
    cleanupFullscreen();
}

void VideoFullscreenInterfaceAVKit::modelDestroyed()
{
    ASSERT(isUIThread());
    invalidate();
}

void VideoFullscreenInterfaceAVKit::requestHideAndExitFullscreen()
{
    if (m_currentMode.hasPictureInPicture())
        return;
    
    LOG(Fullscreen, "VideoFullscreenInterfaceAVKit::requestHideAndExitFullscreen(%p)", this);

    [m_window setHidden:YES];
    [[m_playerViewController view] setHidden:YES];

    if (playbackSessionModel() && m_videoFullscreenModel) {
        playbackSessionModel()->pause();
        m_videoFullscreenModel->requestFullscreenMode(HTMLMediaElementEnums::VideoFullscreenModeNone);
    }
}

void VideoFullscreenInterfaceAVKit::preparedToReturnToInline(bool visible, const IntRect& inlineRect)
{
    LOG(Fullscreen, "VideoFullscreenInterfaceAVKit::preparedToReturnToInline(%p) - visible(%s)", this, boolString(visible));
    setInlineRect(inlineRect, visible);
    [[m_playerViewController view] setNeedsLayout];
    [[m_playerViewController view] layoutIfNeeded];
    if (m_prepareToInlineCallback) {
        WTF::Function<void(bool)> callback = WTFMove(m_prepareToInlineCallback);
        callback(visible);
    }
}

void VideoFullscreenInterfaceAVKit::preparedToExitFullscreen()
{
#if PLATFORM(WATCHOS)
    if (!m_waitingForPreparedToExit)
        return;

    m_waitingForPreparedToExit = false;
    ASSERT(m_videoFullscreenModel);
    if (m_videoFullscreenModel)
        m_videoFullscreenModel->requestFullscreenMode(HTMLMediaElementEnums::VideoFullscreenModeNone, true);
#endif
}

bool VideoFullscreenInterfaceAVKit::mayAutomaticallyShowVideoPictureInPicture() const
{
    return [playerController() isPlaying] && (m_standby || m_currentMode.isFullscreen()) && supportsPictureInPicture();
}

void VideoFullscreenInterfaceAVKit::fullscreenMayReturnToInline(WTF::Function<void(bool)>&& callback)
{
    m_prepareToInlineCallback = WTFMove(callback);
    if (m_fullscreenChangeObserver)
        m_fullscreenChangeObserver->fullscreenMayReturnToInline();
}

void VideoFullscreenInterfaceAVKit::willStartPictureInPicture()
{
    LOG(Fullscreen, "VideoFullscreenInterfaceAVKit::willStartPictureInPicture(%p)", this);
    m_enteringPictureInPicture = true;

    if (m_standby && !m_currentMode.hasVideo()) {
        [m_window setHidden:NO];
        [[m_playerViewController view] setHidden:NO];
    }

    if (!m_hasVideoContentLayer)
        m_fullscreenChangeObserver->requestVideoContentLayer();
    if (m_videoFullscreenModel)
        m_videoFullscreenModel->willEnterPictureInPicture();
}

void VideoFullscreenInterfaceAVKit::didStartPictureInPicture()
{
    LOG(Fullscreen, "VideoFullscreenInterfaceAVKit::didStartPictureInPicture(%p)", this);
    setMode(HTMLMediaElementEnums::VideoFullscreenModePictureInPicture);
    [m_playerViewController setShowsPlaybackControls:YES];

    if (m_currentMode.hasFullscreen()) {
        m_shouldReturnToFullscreenWhenStoppingPiP = YES;
        [[m_playerViewController view] layoutIfNeeded];
        [m_playerViewController exitFullScreenAnimated:YES completionHandler:[protectedThis = makeRefPtr(this), this] (BOOL success, NSError *error) {
            exitFullscreenHandler(success, error);
        }];
    } else {
        [m_window setHidden:YES];
        [[m_playerViewController view] setHidden:YES];
    }

    if (m_videoFullscreenModel)
        m_videoFullscreenModel->didEnterPictureInPicture();

    if (m_enterFullscreenNeedsEnterPictureInPicture)
        doEnterFullscreen();
    else {
        if (m_fullscreenChangeObserver)
            m_fullscreenChangeObserver->didEnterFullscreen();
    }

    m_enteringPictureInPicture = false;
    m_standby = false;
}

void VideoFullscreenInterfaceAVKit::failedToStartPictureInPicture()
{
    LOG(Fullscreen, "VideoFullscreenInterfaceAVKit::failedToStartPictureInPicture(%p)", this);
    [m_playerViewController setShowsPlaybackControls:YES];

    m_targetMode.setPictureInPicture(false);
    if (m_currentMode.hasFullscreen())
        return;

    if (m_fullscreenChangeObserver)
        m_fullscreenChangeObserver->didEnterFullscreen();

    if (m_videoFullscreenModel)
        m_videoFullscreenModel->failedToEnterPictureInPicture();

    if (m_videoFullscreenModel)
        m_videoFullscreenModel->requestFullscreenMode(HTMLMediaElementEnums::VideoFullscreenModeNone);
}

void VideoFullscreenInterfaceAVKit::willStopPictureInPicture()
{
    LOG(Fullscreen, "VideoFullscreenInterfaceAVKit::willStopPictureInPicture(%p)", this);

    m_shouldReturnToFullscreenWhenStoppingPiP = false;

    if (m_currentMode.hasFullscreen() || m_restoringFullscreenForPictureInPictureStop)
        return;

    if (m_videoFullscreenModel)
        m_videoFullscreenModel->willExitPictureInPicture();
}

void VideoFullscreenInterfaceAVKit::didStopPictureInPicture()
{
    LOG(Fullscreen, "VideoFullscreenInterfaceAVKit::didStopPictureInPicture(%p)", this);
    m_targetMode.setPictureInPicture(false);

    if (m_currentMode.hasFullscreen() || m_restoringFullscreenForPictureInPictureStop) {
        clearMode(HTMLMediaElementEnums::VideoFullscreenModePictureInPicture);
        [m_playerViewController setShowsPlaybackControls:YES];

        if (m_exitFullscreenNeedsExitPictureInPicture)
            doExitFullscreen();

        if (m_enterFullscreenNeedsExitPictureInPicture)
            doEnterFullscreen();
        return;
    }

    [m_playerLayerView setBackgroundColor:clearUIColor()];
    [[m_playerViewController view] setBackgroundColor:clearUIColor()];

    if (m_videoFullscreenModel)
        m_videoFullscreenModel->requestFullscreenMode(HTMLMediaElementEnums::VideoFullscreenModeNone);

    clearMode(HTMLMediaElementEnums::VideoFullscreenModePictureInPicture);

    if (m_enterFullscreenNeedsExitPictureInPicture)
        doEnterFullscreen();

    if (m_exitFullscreenNeedsExitPictureInPicture)
        doExitFullscreen();
}

void VideoFullscreenInterfaceAVKit::prepareForPictureInPictureStopWithCompletionHandler(void (^completionHandler)(BOOL restored))
{
    LOG(Fullscreen, "VideoFullscreenInterfaceAVKit::prepareForPictureInPictureStopWithCompletionHandler(%p)", this);
    if (m_shouldReturnToFullscreenWhenStoppingPiP) {
        m_shouldReturnToFullscreenWhenStoppingPiP = false;
        m_restoringFullscreenForPictureInPictureStop = true;

        [m_window setHidden:NO];
        [[m_playerViewController view] setHidden:NO];

        [[m_playerViewController view] layoutIfNeeded];
        [m_playerViewController enterFullScreenAnimated:YES completionHandler:^(BOOL success, NSError *error) {
            enterFullscreenHandler(success, error);
            completionHandler(success);
        }];
        return;
    }

    fullscreenMayReturnToInline([protectedThis = makeRefPtr(this), strongCompletionHandler = adoptNS([completionHandler copy])](bool restored)  {
        LOG(Fullscreen, "VideoFullscreenInterfaceAVKit::prepareForPictureInPictureStopWithCompletionHandler lambda(%p) - restored(%s)", protectedThis.get(), boolString(restored));
        ((void (^)(BOOL))strongCompletionHandler.get())(restored);
    });
}

bool VideoFullscreenInterfaceAVKit::shouldExitFullscreenWithReason(VideoFullscreenInterfaceAVKit::ExitFullScreenReason reason)
{
    // AVKit calls playerViewController:shouldExitFullScreenWithReason in the scenario that the exit fullscreen request
    // is from the web process (e.g., through Javascript API videoElement.webkitExitFullscreen()).
    // We have to ignore the callback in that case.
    if (m_shouldIgnoreAVKitCallbackAboutExitFullscreenReason)
        return true;

    if (!m_videoFullscreenModel)
        return true;

    if (reason == ExitFullScreenReason::PictureInPictureStarted)
        return false;

    if (playbackSessionModel() && (reason == ExitFullScreenReason::DoneButtonTapped || reason == ExitFullScreenReason::RemoteControlStopEventReceived))
        playbackSessionModel()->pause();

    if (!m_watchdogTimer.isActive() && !ignoreWatchdogForDebugging)
        m_watchdogTimer.startOneShot(defaultWatchdogTimerInterval);

#if PLATFORM(WATCHOS)
    if (m_fullscreenChangeObserver) {
        m_waitingForPreparedToExit = true;
        m_fullscreenChangeObserver->willExitFullscreen();
        return false;
    }
#endif
    
    BOOL finished = reason == ExitFullScreenReason::DoneButtonTapped || reason == ExitFullScreenReason::PinchGestureHandled;
    ASSERT(m_videoFullscreenModel);
    if (m_videoFullscreenModel)
        m_videoFullscreenModel->requestFullscreenMode(HTMLMediaElementEnums::VideoFullscreenModeNone, finished);

    return false;
}

void VideoFullscreenInterfaceAVKit::setHasVideoContentLayer(bool value)
{
    m_hasVideoContentLayer = value;

    if (m_hasVideoContentLayer && m_finalizeSetupNeedsVideoContentLayer)
        finalizeSetup();
    if (!m_hasVideoContentLayer && m_cleanupNeedsReturnVideoContentLayer)
        cleanupFullscreen();
    if (!m_hasVideoContentLayer && m_returnToStandbyNeedsReturnVideoContentLayer)
        returnToStandby();
    if (!m_hasVideoContentLayer && m_finalizeSetupNeedsReturnVideoContentLayer)
        finalizeSetup();
    if (!m_hasVideoContentLayer && m_exitFullscreenNeedsReturnContentLayer)
        doExitFullscreen();
}

void VideoFullscreenInterfaceAVKit::setInlineRect(const IntRect& inlineRect, bool visible)
{
    m_inlineRect = inlineRect;
    m_inlineIsVisible = visible;
    m_hasUpdatedInlineRect = true;

    if (m_playerViewController && m_parentView) {
        [CATransaction begin];
        [CATransaction setDisableActions:YES];
        [m_playerViewController view].frame = [m_parentView convertRect:inlineRect toView:[m_playerViewController view].superview];
        [CATransaction commit];
    }

    if (m_setupNeedsInlineRect)
        doSetup();

    if (m_exitFullscreenNeedInlineRect)
        doExitFullscreen();
}

void VideoFullscreenInterfaceAVKit::doSetup()
{
    Mode changes { m_currentMode.mode() ^ m_targetMode.mode() };

    if (m_currentMode.hasVideo() && m_targetMode.hasVideo() && (m_standby != m_targetStandby)) {
        m_standby = m_targetStandby;
        finalizeSetup();
        return;
    }

    if (!m_hasUpdatedInlineRect && m_fullscreenChangeObserver) {
        m_setupNeedsInlineRect = true;
        m_fullscreenChangeObserver->requestUpdateInlineRect();
        return;
    }
    m_setupNeedsInlineRect = false;

    [CATransaction begin];
    [CATransaction setDisableActions:YES];

#if !PLATFORM(WATCHOS)
    if (![[m_parentView window] _isHostedInAnotherProcess] && !m_window) {
        m_window = adoptNS([PAL::allocUIWindowInstance() initWithWindowScene:[[m_parentView window] windowScene]]);
        [m_window setBackgroundColor:clearUIColor()];
        if (!m_viewController)
            m_viewController = adoptNS([PAL::allocUIViewControllerInstance() init]);
        [[m_viewController view] setFrame:[m_window bounds]];
        [m_viewController _setIgnoreAppSupportedOrientations:YES];
        [m_window setRootViewController:m_viewController.get()];
        [m_window setWindowLevel:PAL::get_UIKit_UITextEffectsBeneathStatusBarWindowLevel() + 1];
        [m_window makeKeyAndVisible];
    }
#endif

    if (!m_playerLayerView)
        m_playerLayerView = adoptNS([allocWebAVPlayerLayerViewInstance() init]);
    [m_playerLayerView setHidden:[playerController() isExternalPlaybackActive]];
    [m_playerLayerView setBackgroundColor:clearUIColor()];

    if (!m_currentMode.hasPictureInPicture()) {
        [m_playerLayerView setVideoView:m_videoView.get()];
        [m_playerLayerView addSubview:m_videoView.get()];
    }

    WebAVPlayerLayer *playerLayer = (WebAVPlayerLayer *)[m_playerLayerView playerLayer];

    auto modelVideoLayerFrame = CGRectMake(0, 0, m_inlineRect.width(), m_inlineRect.height());
    [playerLayer setModelVideoLayerFrame:modelVideoLayerFrame];
    [playerLayer setVideoDimensions:[playerController() contentDimensions]];
    playerLayer.fullscreenInterface = this;
    if (m_videoFullscreenModel)
        m_videoFullscreenModel->setVideoLayerFrame(modelVideoLayerFrame);

    if (!m_playerViewController)
        m_playerViewController = adoptNS([[WebAVPlayerViewController alloc] initWithFullscreenInterface:this]);

    [m_playerViewController setShowsPlaybackControls:NO];
    [m_playerViewController setPlayerController:(AVPlayerController *)playerController()];
    [m_playerViewController setDelegate:m_playerViewControllerDelegate.get()];
    [m_playerViewController setAllowsPictureInPicturePlayback:m_allowsPictureInPicturePlayback];
    [playerController() setPictureInPicturePossible:m_allowsPictureInPicturePlayback];
    if (!m_routingContextUID.isEmpty())
        [m_playerViewController setWebKitOverrideRouteSharingPolicy:(NSUInteger)m_routeSharingPolicy routingContextUID:m_routingContextUID];

#if PLATFORM(WATCHOS)
    m_viewController = videoFullscreenModel() ? videoFullscreenModel()->createVideoFullscreenViewController(m_playerViewController.get().avPlayerViewController) : nil;
#endif

    if (m_viewController) {
        [m_viewController addChildViewController:m_playerViewController.get().avPlayerViewController];
        [[m_viewController view] addSubview:[m_playerViewController view]];
    } else
        [m_parentView addSubview:[m_playerViewController view]];

    [m_playerViewController view].frame = [m_parentView convertRect:m_inlineRect toView:[m_playerViewController view].superview];
    [[m_playerViewController view] setBackgroundColor:clearUIColor()];
    [[m_playerViewController view] setAutoresizingMask:(UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleRightMargin)];

    [[m_playerViewController view] setNeedsLayout];
    [[m_playerViewController view] layoutIfNeeded];

    if (m_targetStandby && !m_currentMode.hasVideo()) {
        [m_window setHidden:YES];
        [[m_playerViewController view] setHidden:YES];
    }

    [CATransaction commit];

    finalizeSetup();
}

void VideoFullscreenInterfaceAVKit::finalizeSetup()
{
    dispatch_async(dispatch_get_main_queue(), [protectedThis = makeRefPtr(this), this] {
        if (m_fullscreenChangeObserver) {
            if (!m_hasVideoContentLayer && m_targetMode.hasVideo()) {
                m_finalizeSetupNeedsVideoContentLayer = true;
                m_fullscreenChangeObserver->requestVideoContentLayer();
                return;
            }
            m_finalizeSetupNeedsVideoContentLayer = false;
            if (m_hasVideoContentLayer && !m_targetMode.hasVideo()) {
                m_finalizeSetupNeedsReturnVideoContentLayer = true;
                m_fullscreenChangeObserver->returnVideoContentLayer();
                return;
            }
            m_finalizeSetupNeedsReturnVideoContentLayer = false;
            m_fullscreenChangeObserver->didSetupFullscreen();
        }
    });
}

void VideoFullscreenInterfaceAVKit::doEnterFullscreen()
{
    m_standby = m_targetStandby;

    [[m_playerViewController view] layoutIfNeeded];
    if (m_targetMode.hasFullscreen() && !m_currentMode.hasFullscreen()) {
        m_enterFullscreenNeedsEnterFullscreen = true;
        [m_window setHidden:NO];
        [m_playerViewController enterFullScreenAnimated:YES completionHandler:[this, protectedThis = makeRefPtr(this)] (BOOL success, NSError *error) {
            enterFullscreenHandler(success, error);
        }];
        return;
    }
    m_enterFullscreenNeedsEnterFullscreen = false;

    if (m_targetMode.hasPictureInPicture() && !m_currentMode.hasPictureInPicture()) {
        m_enterFullscreenNeedsEnterPictureInPicture = true;
        if ([m_playerViewController isPictureInPicturePossible])
            [m_playerViewController startPictureInPicture];
        else
#if HAVE(AVOBSERVATIONCONTROLLER)
            [m_playerViewController tryToStartPictureInPicture];
#else
            failedToStartPictureInPicture();
#endif

        return;
    }
    m_enterFullscreenNeedsEnterPictureInPicture = false;

    if (!m_targetMode.hasFullscreen() && m_currentMode.hasFullscreen()) {
        m_enterFullscreenNeedsExitFullscreen = true;
        [m_playerViewController exitFullScreenAnimated:YES completionHandler:[protectedThis = makeRefPtr(this), this] (BOOL success, NSError *error) {
            exitFullscreenHandler(success, error);
        }];
        return;
    }
    m_enterFullscreenNeedsExitFullscreen = false;

    if (!m_targetMode.hasPictureInPicture() && m_currentMode.hasPictureInPicture()) {
        m_enterFullscreenNeedsExitPictureInPicture = true;
        [m_playerViewController stopPictureInPicture];
        return;
    }
    m_enterFullscreenNeedsExitPictureInPicture = false;

    if (m_fullscreenChangeObserver)
        m_fullscreenChangeObserver->didEnterFullscreen();
}

void VideoFullscreenInterfaceAVKit::doExitFullscreen()
{
    LOG(Fullscreen, "VideoFullscreenInterfaceAVKit::doExitFullscreen(%p)", this);

    if (m_currentMode.hasVideo() && !m_hasUpdatedInlineRect && m_fullscreenChangeObserver) {
        m_exitFullscreenNeedInlineRect = true;
        m_fullscreenChangeObserver->requestUpdateInlineRect();
        return;
    }
    m_exitFullscreenNeedInlineRect = false;

    if (m_currentMode.hasMode(HTMLMediaElementEnums::VideoFullscreenModeStandard)) {
        m_exitFullscreenNeedsExitFullscreen = true;
        [m_playerViewController exitFullScreenAnimated:YES completionHandler:[protectedThis = makeRefPtr(this), this] (BOOL success, NSError *error) {
            exitFullscreenHandler(success, error);
        }];
        return;
    }
    m_exitFullscreenNeedsExitFullscreen = false;

    if (m_currentMode.hasMode(HTMLMediaElementEnums::VideoFullscreenModePictureInPicture)) {
        m_exitFullscreenNeedsExitPictureInPicture = true;
        m_shouldReturnToFullscreenWhenStoppingPiP = false;
        [m_window setHidden:NO];
        [m_playerViewController stopPictureInPicture];
        return;
    }
    m_exitFullscreenNeedsExitPictureInPicture = false;

    if (m_hasVideoContentLayer && m_fullscreenChangeObserver) {
        m_exitFullscreenNeedsReturnContentLayer = true;
        m_fullscreenChangeObserver->returnVideoContentLayer();
        return;
    }
    m_exitFullscreenNeedsReturnContentLayer = false;

    m_standby = false;

    dispatch_async(dispatch_get_main_queue(), [protectedThis = makeRefPtr(this), this] {
        if (m_fullscreenChangeObserver)
            m_fullscreenChangeObserver->didExitFullscreen();
    });
}

void VideoFullscreenInterfaceAVKit::exitFullscreenHandler(BOOL success, NSError* error)
{
    if (!success)
        WTFLogAlways("-[AVPlayerViewController exitFullScreenAnimated:completionHandler:] failed with error %s", [[error localizedDescription] UTF8String]);

    LOG(Fullscreen, "VideoFullscreenInterfaceAVKit::didExitFullscreen(%p) - %d", this, success);

    clearMode(HTMLMediaElementEnums::VideoFullscreenModeStandard);

    if (hasMode(HTMLMediaElementEnums::VideoFullscreenModePictureInPicture)) {
        [m_window setHidden:YES];
        [[m_playerViewController view] setHidden:YES];
    } else {
        [CATransaction begin];
        [CATransaction setDisableActions:YES];
        [m_playerLayerView setBackgroundColor:clearUIColor()];
        [[m_playerViewController view] setBackgroundColor:clearUIColor()];
        [CATransaction commit];
    }

    if (m_enterFullscreenNeedsExitFullscreen)
        doEnterFullscreen();
    
    if (m_exitFullscreenNeedsExitFullscreen)
        doExitFullscreen();
}

void VideoFullscreenInterfaceAVKit::enterFullscreenHandler(BOOL success, NSError* error)
{
    if (!success)
        WTFLogAlways("-[AVPlayerViewController enterFullScreenAnimated:completionHandler:] failed with error %s", [[error localizedDescription] UTF8String]);

    LOG(Fullscreen, "VideoFullscreenInterfaceAVKit::enterFullscreenStandard - lambda(%p)", this);
    setMode(HTMLMediaElementEnums::VideoFullscreenModeStandard);
    [m_playerViewController setShowsPlaybackControls:YES];

    m_restoringFullscreenForPictureInPictureStop = false;

    if (m_enterFullscreenNeedsEnterFullscreen)
        doEnterFullscreen();
}

void VideoFullscreenInterfaceAVKit::returnToStandby()
{
    if (m_hasVideoContentLayer && m_fullscreenChangeObserver) {
        m_returnToStandbyNeedsReturnVideoContentLayer = true;
        m_fullscreenChangeObserver->returnVideoContentLayer();
        return;
    }

    m_returnToStandbyNeedsReturnVideoContentLayer = false;

    [m_window setHidden:YES];
    [[m_playerViewController view] setHidden:YES];
}

NO_RETURN_DUE_TO_ASSERT void VideoFullscreenInterfaceAVKit::watchdogTimerFired()
{
    LOG(Fullscreen, "VideoFullscreenInterfaceAVKit::watchdogTimerFired(%p) - no exit fullscreen response in %gs; forcing fullscreen hidden.", this, defaultWatchdogTimerInterval.value());
    ASSERT_NOT_REACHED();
    [m_window setHidden:YES];
    [[m_playerViewController view] setHidden:YES];
}

void VideoFullscreenInterfaceAVKit::setMode(HTMLMediaElementEnums::VideoFullscreenMode mode)
{
    if ((m_currentMode.mode() & mode) == mode)
        return;

    m_currentMode.setMode(mode);
    // Mode::mode() can be 3 (VideoFullscreenModeStandard | VideoFullscreenModePictureInPicture).
    // HTMLVideoElement does not expect such a value in the fullscreenModeChanged() callback.
    if (m_videoFullscreenModel)
        m_videoFullscreenModel->fullscreenModeChanged(mode);
}

void VideoFullscreenInterfaceAVKit::clearMode(HTMLMediaElementEnums::VideoFullscreenMode mode)
{
    if ((~m_currentMode.mode() & mode) == mode)
        return;

    m_currentMode.clearMode(mode);
    if (m_videoFullscreenModel)
        m_videoFullscreenModel->fullscreenModeChanged(m_currentMode.mode());
}

bool VideoFullscreenInterfaceAVKit::isPlayingVideoInEnhancedFullscreen() const
{
    return hasMode(WebCore::HTMLMediaElementEnums::VideoFullscreenModePictureInPicture) && [playerController() isPlaying];
}

static Optional<bool> isPictureInPictureSupported;

void WebCore::setSupportsPictureInPicture(bool isSupported)
{
    isPictureInPictureSupported = isSupported;
}

bool WebCore::supportsPictureInPicture()
{
#if ENABLE(VIDEO_PRESENTATION_MODE) && !PLATFORM(WATCHOS)
    if (isPictureInPictureSupported.hasValue())
        return *isPictureInPictureSupported;
    return [getAVPictureInPictureControllerClass() isPictureInPictureSupported];
#else
    return false;
#endif
}

#endif // PLATFORM(IOS_FAMILY) && ENABLE(VIDEO_PRESENTATION_MODE)