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

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

   JUCE is an open source framework subject to commercial or open source
   licensing.

   By downloading, installing, or using the JUCE framework, or combining the
   JUCE framework with any other source code, object code, content or any other
   copyrightable work, you agree to the terms of the JUCE End User Licence
   Agreement, and all incorporated terms including the JUCE Privacy Policy and
   the JUCE Website Terms of Service, as applicable, which will bind you. If you
   do not agree to the terms of these agreements, we will not license the JUCE
   framework to you, and you must discontinue the installation or download
   process and cease use of the JUCE framework.

   JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
   JUCE Privacy Policy: https://juce.com/juce-privacy-policy
   JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/

   Or:

   You may also use this code under the terms of the AGPLv3:
   https://www.gnu.org/licenses/agpl-3.0.en.html

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

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

#if JUCE_MAC
using Base = NSViewComponent;
#else
using Base = UIViewComponent;
#endif

struct VideoComponent::Pimpl   : public Base
{
    Pimpl (VideoComponent& ownerToUse, bool useNativeControlsIfAvailable)
        : owner (ownerToUse),
          playerController (*this, useNativeControlsIfAvailable)
    {
        setVisible (true);

        auto* view = playerController.getView();
        setView (view);

       #if JUCE_MAC
        [view setNextResponder: [view superview]];
        [view setWantsLayer: YES];
       #endif
    }

    ~Pimpl()
    {
        close();
        setView (nil);
    }

    Result load (const File& file)
    {
        auto r = load (createNSURLFromFile (file));

        if (r.wasOk())
            currentFile = file;

        return r;
    }

    Result load (const URL& url)
    {
        auto r = load ([NSURL URLWithString: juceStringToNS (url.toString (true))]);

        if (r.wasOk())
            currentURL = url;

        return r;
    }

    Result load (NSURL* url)
    {
        if (url != nil)
        {
            close();
            return playerController.load (url);
        }

        return Result::fail ("Couldn't open movie");
    }

    void loadAsync (const URL& url, std::function<void (const URL&, Result)> callback)
    {
        if (url.isEmpty())
        {
            jassertfalse;
            return;
        }

        currentURL = url;

        jassert (callback != nullptr);

        loadFinishedCallback = std::move (callback);

        playerController.loadAsync (url);
    }

    void close()
    {
        stop();
        playerController.close();
        currentFile = File();
        currentURL = {};
    }

    bool isOpen() const noexcept        { return playerController.getPlayer() != nil; }
    bool isPlaying() const noexcept     { return ! approximatelyEqual (getSpeed(), 0.0); }

    void play() noexcept                { [playerController.getPlayer() play]; setSpeed (playSpeedMult); }
    void stop() noexcept                { [playerController.getPlayer() pause]; }

    void setPosition (double newPosition)
    {
        if (auto* p = playerController.getPlayer())
        {
            CMTime t = { (CMTimeValue) (100000.0 * newPosition),
                         (CMTimeScale) 100000, kCMTimeFlags_Valid, {} };

            [p seekToTime: t
          toleranceBefore: kCMTimeZero
           toleranceAfter: kCMTimeZero];
        }
    }

    double getPosition() const
    {
        if (auto* p = playerController.getPlayer())
            return toSeconds ([p currentTime]);

        return 0.0;
    }

    void setSpeed (double newSpeed)
    {
        playSpeedMult = newSpeed;

        // Calling non 0.0 speed on a paused player would start it...
        if (isPlaying())
            [playerController.getPlayer() setRate: (float) playSpeedMult];
    }

    double getSpeed() const
    {
        if (auto* p = playerController.getPlayer())
            return [p rate];

        return 0.0;
    }

    Rectangle<int> getNativeSize() const
    {
        if (auto* p = playerController.getPlayer())
        {
            auto s = [[p currentItem] presentationSize];
            return { (int) s.width, (int) s.height };
        }

        return {};
    }

    double getDuration() const
    {
        if (auto* p = playerController.getPlayer())
            return toSeconds ([[p currentItem] duration]);

        return 0.0;
    }

    void setVolume (float newVolume)
    {
        [playerController.getPlayer() setVolume: newVolume];
    }

    float getVolume() const
    {
        if (auto* p = playerController.getPlayer())
            return [p volume];

        return 0.0f;
    }

    File currentFile;
    URL currentURL;

private:
    //==============================================================================
    template <typename Derived>
    class PlayerControllerBase
    {
    public:
        ~PlayerControllerBase()
        {
            // Derived classes must call detachPlayerStatusObserver() before destruction!
            jassert (! playerStatusObserverAttached);

            // Derived classes must call detachPlaybackObserver() before destruction!
            jassert (! playbackObserverAttached);

            // Note that it's unsafe to call detachPlayerStatusObserver and detachPlaybackObserver
            // directly here, because those functions call into the derived class, which will have
            // been destroyed at this point.
        }

    protected:
        //==============================================================================
        struct JucePlayerStatusObserverClass : public ObjCClass<NSObject>
        {
            JucePlayerStatusObserverClass()    : ObjCClass<NSObject> ("JucePlayerStatusObserverClass_")
            {
                JUCE_BEGIN_IGNORE_WARNINGS_GCC_LIKE ("-Wundeclared-selector")
                addMethod (@selector (observeValueForKeyPath:ofObject:change:context:), valueChanged);
                JUCE_END_IGNORE_WARNINGS_GCC_LIKE

                addIvar<PlayerAsyncInitialiser*> ("owner");

                registerClass();
            }

            //==============================================================================
            static PlayerControllerBase& getOwner (id self) { return *getIvar<PlayerControllerBase*> (self, "owner"); }
            static void setOwner (id self, PlayerControllerBase* p) { object_setInstanceVariable (self, "owner", p); }

        private:
            static void valueChanged (id self, SEL, NSString* keyPath, id,
                                      NSDictionary<NSString*, id>* change, void*)
            {
                auto& owner = getOwner (self);

                if ([keyPath isEqualToString: nsStringLiteral ("rate")])
                {
                    auto oldRate = [[change objectForKey: NSKeyValueChangeOldKey] floatValue];
                    auto newRate = [[change objectForKey: NSKeyValueChangeNewKey] floatValue];

                    if (approximatelyEqual (oldRate, 0.0f) && ! approximatelyEqual (newRate, 0.0f))
                        owner.playbackStarted();
                    else if (! approximatelyEqual (oldRate, 0.0f) && approximatelyEqual (newRate, 0.0f))
                        owner.playbackStopped();
                }
                else if ([keyPath isEqualToString: nsStringLiteral ("status")])
                {
                    auto status = [[change objectForKey: NSKeyValueChangeNewKey] intValue];

                    if (status == AVPlayerStatusFailed)
                        owner.errorOccurred();
                }
            }
        };

        //==============================================================================
        struct JucePlayerItemPlaybackStatusObserverClass : public ObjCClass<NSObject>
        {
            JucePlayerItemPlaybackStatusObserverClass()    : ObjCClass<NSObject> ("JucePlayerItemPlaybackStatusObserverClass_")
            {
                JUCE_BEGIN_IGNORE_WARNINGS_GCC_LIKE ("-Wundeclared-selector")
                addMethod (@selector (processNotification:), notificationReceived);
                JUCE_END_IGNORE_WARNINGS_GCC_LIKE

                addIvar<PlayerControllerBase*> ("owner");

                registerClass();
            }

            //==============================================================================
            static PlayerControllerBase& getOwner (id self) { return *getIvar<PlayerControllerBase*> (self, "owner"); }
            static void setOwner (id self, PlayerControllerBase* p) { object_setInstanceVariable (self, "owner", p); }

        private:
            static void notificationReceived (id self, SEL, NSNotification* notification)
            {
                if ([notification.name isEqualToString: AVPlayerItemDidPlayToEndTimeNotification])
                    getOwner (self).playbackReachedEndTime();
            }
        };

        //==============================================================================
        class PlayerAsyncInitialiser
        {
        public:
            PlayerAsyncInitialiser (PlayerControllerBase& ownerToUse)
                : owner (ownerToUse),
                  assetKeys ([[NSArray alloc] initWithObjects: nsStringLiteral ("duration"), nsStringLiteral ("tracks"),
                                                               nsStringLiteral ("playable"), nil])
            {
                static JucePlayerItemPreparationStatusObserverClass cls;
                playerItemPreparationStatusObserver.reset ([cls.createInstance() init]);
                JucePlayerItemPreparationStatusObserverClass::setOwner (playerItemPreparationStatusObserver.get(), this);
            }

            ~PlayerAsyncInitialiser()
            {
                detachPreparationStatusObserver();
            }

            void loadAsync (URL url)
            {
                auto nsUrl = [NSURL URLWithString: juceStringToNS (url.toString (true))];
                JUCE_BEGIN_IGNORE_WARNINGS_GCC_LIKE ("-Wnullable-to-nonnull-conversion")
                asset.reset ([[AVURLAsset alloc] initWithURL: nsUrl options: nil]);
                JUCE_END_IGNORE_WARNINGS_GCC_LIKE

                [asset.get() loadValuesAsynchronouslyForKeys: assetKeys.get()
                                           completionHandler: ^() { checkAllKeysReadyFor (asset.get(), url); }];
            }

        private:
            //==============================================================================
            struct JucePlayerItemPreparationStatusObserverClass : public ObjCClass<NSObject>
            {
                JucePlayerItemPreparationStatusObserverClass()    : ObjCClass<NSObject> ("JucePlayerItemStatusObserverClass_")
                {
                    JUCE_BEGIN_IGNORE_WARNINGS_GCC_LIKE ("-Wundeclared-selector")
                    addMethod (@selector (observeValueForKeyPath:ofObject:change:context:), valueChanged);
                    JUCE_END_IGNORE_WARNINGS_GCC_LIKE

                    addIvar<PlayerAsyncInitialiser*> ("owner");

                    registerClass();
                }

                //==============================================================================
                static PlayerAsyncInitialiser& getOwner (id self) { return *getIvar<PlayerAsyncInitialiser*> (self, "owner"); }
                static void setOwner (id self, PlayerAsyncInitialiser* p) { object_setInstanceVariable (self, "owner", p); }

            private:
                static void valueChanged (id self, SEL, NSString*, id object,
                                          NSDictionary<NSString*, id>* change, void* context)
                {
                    auto& owner = getOwner (self);

                    if (context == &owner)
                    {
                        auto* playerItem = (AVPlayerItem*) object;
                        auto* urlAsset = (AVURLAsset*) playerItem.asset;

                        URL url (nsStringToJuce (urlAsset.URL.absoluteString));
                        auto oldStatus = [[change objectForKey: NSKeyValueChangeOldKey] intValue];
                        auto newStatus = [[change objectForKey: NSKeyValueChangeNewKey] intValue];

                        // Ignore spurious notifications
                        if (oldStatus == newStatus)
                            return;

                        if (newStatus == AVPlayerItemStatusFailed)
                        {
                            auto errorMessage = playerItem.error != nil
                                              ? nsStringToJuce (playerItem.error.localizedDescription)
                                              : String();

                            owner.notifyOwnerPreparationFinished (url, Result::fail (errorMessage), nullptr);
                        }
                        else if (newStatus == AVPlayerItemStatusReadyToPlay)
                        {
                            owner.notifyOwnerPreparationFinished (url, Result::ok(), owner.player.get());
                        }
                        else
                        {
                            jassertfalse;
                        }
                    }
                }
            };

            //==============================================================================
            PlayerControllerBase& owner;

            std::unique_ptr<AVURLAsset, NSObjectDeleter> asset;
            std::unique_ptr<NSArray<NSString*>, NSObjectDeleter> assetKeys;
            std::unique_ptr<AVPlayerItem, NSObjectDeleter> playerItem;
            std::unique_ptr<NSObject, NSObjectDeleter> playerItemPreparationStatusObserver;
            std::unique_ptr<AVPlayer, NSObjectDeleter> player;

            //==============================================================================
            void checkAllKeysReadyFor (AVAsset* assetToCheck, const URL& url)
            {
                NSError* error = nil;

                [[maybe_unused]] int successCount = 0;

                for (NSString* key : assetKeys.get())
                {
                    switch ([assetToCheck statusOfValueForKey: key error: &error])
                    {
                        case AVKeyValueStatusLoaded:
                        {
                            ++successCount;
                            break;
                        }
                        case AVKeyValueStatusCancelled:
                        {
                            notifyOwnerPreparationFinished (url, Result::fail ("Loading cancelled"), nullptr);
                            return;
                        }
                        case AVKeyValueStatusFailed:
                        {
                            auto errorMessage = error != nil ? nsStringToJuce (error.localizedDescription) : String();
                            notifyOwnerPreparationFinished (url, Result::fail (errorMessage), nullptr);
                            return;
                        }

                        case AVKeyValueStatusUnknown:
                        case AVKeyValueStatusLoading:
                        default:
                            break;
                    }
                }

                jassert (successCount == (int) [assetKeys.get() count]);
                preparePlayerItem();
            }

            void preparePlayerItem()
            {
                playerItem.reset ([[AVPlayerItem alloc] initWithAsset: asset.get()]);

                attachPreparationStatusObserver();

                player.reset ([[AVPlayer alloc] initWithPlayerItem: playerItem.get()]);
            }

            //==============================================================================
            void attachPreparationStatusObserver()
            {
                [playerItem.get() addObserver: playerItemPreparationStatusObserver.get()
                                   forKeyPath: nsStringLiteral ("status")
                                      options: NSKeyValueObservingOptionOld | NSKeyValueObservingOptionNew
                                      context: this];
            }

            void detachPreparationStatusObserver()
            {
                if (playerItem != nullptr && playerItemPreparationStatusObserver != nullptr)
                {
                    [playerItem.get() removeObserver: playerItemPreparationStatusObserver.get()
                                          forKeyPath: nsStringLiteral ("status")
                                             context: this];
                }
            }

            //==============================================================================
            void notifyOwnerPreparationFinished (const URL& url, Result r, AVPlayer* preparedPlayer)
            {
                MessageManager::callAsync ([url, preparedPlayer, r,
                                            safeThis = WeakReference<PlayerAsyncInitialiser> { this }]() mutable
                {
                    if (safeThis != nullptr)
                        safeThis->owner.playerPreparationFinished (url, r, preparedPlayer);
                });
            }

            JUCE_DECLARE_WEAK_REFERENCEABLE (PlayerAsyncInitialiser)
        };

        //==============================================================================
        Pimpl& owner;
        bool useNativeControls;

        PlayerAsyncInitialiser playerAsyncInitialiser;
        std::unique_ptr<NSObject, NSObjectDeleter> playerStatusObserver;
        std::unique_ptr<NSObject, NSObjectDeleter> playerItemPlaybackStatusObserver;

        //==============================================================================
        PlayerControllerBase (Pimpl& ownerToUse, bool useNativeControlsIfAvailable)
            : owner (ownerToUse),
              useNativeControls (useNativeControlsIfAvailable),
              playerAsyncInitialiser (*this)
        {
            static JucePlayerStatusObserverClass playerObserverClass;
            playerStatusObserver.reset ([playerObserverClass.createInstance() init]);
            JucePlayerStatusObserverClass::setOwner (playerStatusObserver.get(), this);

            static JucePlayerItemPlaybackStatusObserverClass itemObserverClass;
            playerItemPlaybackStatusObserver.reset ([itemObserverClass.createInstance() init]);
            JucePlayerItemPlaybackStatusObserverClass::setOwner (playerItemPlaybackStatusObserver.get(), this);
        }

        //==============================================================================
        void attachPlayerStatusObserver()
        {
            [crtp().getPlayer() addObserver: playerStatusObserver.get()
                                 forKeyPath: nsStringLiteral ("rate")
                                    options: NSKeyValueObservingOptionOld | NSKeyValueObservingOptionNew
                                    context: this];

            [crtp().getPlayer() addObserver: playerStatusObserver.get()
                                 forKeyPath: nsStringLiteral ("status")
                                    options: NSKeyValueObservingOptionNew
                                    context: this];

            playerStatusObserverAttached = true;
        }

        void detachPlayerStatusObserver()
        {
            if (crtp().getPlayer() != nullptr && playerStatusObserver != nullptr)
            {
                [crtp().getPlayer() removeObserver: playerStatusObserver.get()
                                        forKeyPath: nsStringLiteral ("rate")
                                           context: this];

                [crtp().getPlayer() removeObserver: playerStatusObserver.get()
                                        forKeyPath: nsStringLiteral ("status")
                                           context: this];
            }

            playerStatusObserverAttached = false;
        }

        void attachPlaybackObserver()
        {
            JUCE_BEGIN_IGNORE_WARNINGS_GCC_LIKE ("-Wundeclared-selector")
            [[NSNotificationCenter defaultCenter] addObserver: playerItemPlaybackStatusObserver.get()
                                                     selector: @selector (processNotification:)
                                                         name: AVPlayerItemDidPlayToEndTimeNotification
                                                       object: [crtp().getPlayer() currentItem]];
            JUCE_END_IGNORE_WARNINGS_GCC_LIKE

            playbackObserverAttached = true;
        }

        void detachPlaybackObserver()
        {
            JUCE_BEGIN_IGNORE_WARNINGS_GCC_LIKE ("-Wundeclared-selector")
            [[NSNotificationCenter defaultCenter] removeObserver: playerItemPlaybackStatusObserver.get()];
            JUCE_END_IGNORE_WARNINGS_GCC_LIKE

            playbackObserverAttached = false;
        }

    private:
        //==============================================================================
        Derived& crtp() { return static_cast<Derived&> (*this); }

        //==============================================================================
        void playerPreparationFinished (const URL& url, Result r, AVPlayer* preparedPlayer)
        {
            if (preparedPlayer != nil)
                crtp().setPlayer (preparedPlayer);

            owner.playerPreparationFinished (url, r);
        }

        void playbackReachedEndTime()
        {
            MessageManager::callAsync ([safeThis = WeakReference<PlayerControllerBase> { this }]() mutable
                                       {
                                           if (safeThis != nullptr)
                                               safeThis->owner.playbackReachedEndTime();
                                       });
        }

        //==============================================================================
        void errorOccurred()
        {
            auto errorMessage = (crtp().getPlayer() != nil && crtp().getPlayer().error != nil)
                              ? nsStringToJuce (crtp().getPlayer().error.localizedDescription)
                              : String();

            owner.errorOccurred (errorMessage);
        }

        void playbackStarted()
        {
            owner.playbackStarted();
        }

        void playbackStopped()
        {
            owner.playbackStopped();
        }

        bool playerStatusObserverAttached = false, playbackObserverAttached = false;

        JUCE_DECLARE_WEAK_REFERENCEABLE (PlayerControllerBase)
    };

   #if JUCE_MAC
    //==============================================================================
    class PlayerController  : public PlayerControllerBase<PlayerController>
    {
    public:
        PlayerController (Pimpl& ownerToUse, bool useNativeControlsIfAvailable)
            : PlayerControllerBase (ownerToUse, useNativeControlsIfAvailable)
        {
            wrappedPlayer = [&]() -> std::unique_ptr<WrappedPlayer>
            {
                if (useNativeControls)
                    return std::make_unique<WrappedPlayerView>();

                return std::make_unique<WrappedPlayerLayer>();
            }();
        }

        NSView* getView()
        {
            return wrappedPlayer->getView();
        }

        Result load (NSURL* url)
        {
            if (auto player = [AVPlayer playerWithURL: url])
            {
                setPlayer (player);
                return Result::ok();
            }

            return Result::fail ("Couldn't open movie");
        }

        void loadAsync (URL url)
        {
            playerAsyncInitialiser.loadAsync (url);
        }

        void close() { setPlayer (nil); }

        void setPlayer (AVPlayer* player)
        {
            detachPlayerStatusObserver();
            detachPlaybackObserver();

            wrappedPlayer->setPlayer (player);

            if (player != nil)
            {
                attachPlayerStatusObserver();
                attachPlaybackObserver();
            }
        }

        AVPlayer* getPlayer() const
        {
            return wrappedPlayer->getPlayer();
        }

    private:
        struct WrappedPlayer
        {
            virtual ~WrappedPlayer() = default;
            virtual NSView* getView() const = 0;
            virtual AVPlayer* getPlayer() const = 0;
            virtual void setPlayer (AVPlayer*) = 0;
        };

        class WrappedPlayerLayer : public WrappedPlayer
        {
        public:
            WrappedPlayerLayer()                        { [view.get() setLayer: playerLayer.get()]; }
            NSView* getView() const override            { return view.get(); }
            AVPlayer* getPlayer() const override        { return [playerLayer.get() player]; }
            void setPlayer (AVPlayer* player) override  { [playerLayer.get() setPlayer: player]; }

        private:
            NSUniquePtr<NSView> view                    { [[NSView alloc] init] };
            NSUniquePtr<AVPlayerLayer> playerLayer      { [[AVPlayerLayer alloc] init] };
        };

        class WrappedPlayerView : public WrappedPlayer
        {
        public:
            WrappedPlayerView() = default;
            NSView* getView() const override            { return playerView.get(); }
            AVPlayer* getPlayer() const override        { return [playerView.get() player]; }
            void setPlayer (AVPlayer* player) override  { [playerView.get() setPlayer: player]; }

        private:
            NSUniquePtr<AVPlayerView> playerView        { [[AVPlayerView alloc] init] };
        };

        std::unique_ptr<WrappedPlayer> wrappedPlayer;
    };
   #else
    //==============================================================================
    class PlayerController  : public PlayerControllerBase<PlayerController>
    {
    public:
        PlayerController (Pimpl& ownerToUse, bool useNativeControlsIfAvailable)
            : PlayerControllerBase (ownerToUse, useNativeControlsIfAvailable)
        {
            if (useNativeControls)
            {
                playerViewController.reset ([[AVPlayerViewController alloc] init]);
            }
            else
            {
                static JuceVideoViewerClass cls;
                playerView.reset ([cls.createInstance() init]);

                playerLayer.reset ([[AVPlayerLayer alloc] init]);
                [playerView.get().layer addSublayer: playerLayer.get()];
            }
        }

        UIView* getView()
        {
            if (useNativeControls)
                return [playerViewController.get() view];

            // Should call getView() only once.
            jassert (playerView != nil);
            return playerView.release();
        }

        Result load (NSURL*)
        {
            jassertfalse;
            return Result::fail ("Synchronous loading is not supported on iOS, use loadAsync()");
        }

        void loadAsync (URL url)
        {
            playerAsyncInitialiser.loadAsync (url);
        }

        void close() { setPlayer (nil); }

        AVPlayer* getPlayer() const
        {
            if (useNativeControls)
                return [playerViewController.get() player];

            return [playerLayer.get() player];
        }

        void setPlayer (AVPlayer* playerToUse)
        {
            detachPlayerStatusObserver();
            detachPlaybackObserver();

            if (useNativeControls)
                [playerViewController.get() setPlayer: playerToUse];
            else
                [playerLayer.get() setPlayer: playerToUse];

            if (playerToUse != nil)
            {
                attachPlayerStatusObserver();
                attachPlaybackObserver();
            }
        }

    private:
        //==============================================================================
        struct JuceVideoViewerClass    : public ObjCClass<UIView>
        {
            JuceVideoViewerClass()  : ObjCClass<UIView> ("JuceVideoViewerClass_")
            {
                addMethod (@selector (layoutSubviews), layoutSubviews);

                registerClass();
            }

        private:
            static void layoutSubviews (id self, SEL)
            {
                sendSuperclassMessage<void> (self, @selector (layoutSubviews));

                UIView* asUIView = (UIView*) self;

                if (auto* previewLayer = getPreviewLayer (self))
                    previewLayer.frame = asUIView.bounds;
            }

            static AVPlayerLayer* getPreviewLayer (id self)
            {
                UIView* asUIView = (UIView*) self;

                if (asUIView.layer.sublayers != nil && [asUIView.layer.sublayers count] > 0)
                    if ([asUIView.layer.sublayers[0] isKindOfClass: [AVPlayerLayer class]])
                        return (AVPlayerLayer*) asUIView.layer.sublayers[0];

                return nil;
            }
        };

        //==============================================================================
        std::unique_ptr<AVPlayerViewController, NSObjectDeleter> playerViewController;

        std::unique_ptr<UIView, NSObjectDeleter> playerView;
        std::unique_ptr<AVPlayerLayer, NSObjectDeleter> playerLayer;
    };
   #endif

    //==============================================================================
    VideoComponent& owner;

    PlayerController playerController;

    std::function<void (const URL&, Result)> loadFinishedCallback;

    double playSpeedMult = 1.0;

    static double toSeconds (const CMTime& t) noexcept
    {
        return t.timescale != 0 ? ((double) t.value / (double) t.timescale) : 0.0;
    }

    void playerPreparationFinished (const URL& url, Result r)
    {
        owner.resized();

        loadFinishedCallback (url, r);
        loadFinishedCallback = nullptr;
    }

    void errorOccurred (const String& errorMessage)
    {
        NullCheckedInvocation::invoke (owner.onErrorOccurred, errorMessage);
    }

    void playbackStarted()
    {
        NullCheckedInvocation::invoke (owner.onPlaybackStarted);
    }

    void playbackStopped()
    {
        NullCheckedInvocation::invoke (owner.onPlaybackStopped);
    }

    void playbackReachedEndTime()
    {
        stop();
        setPosition (0.0);
    }

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (Pimpl)
};