// refsCallback: (optional)
//   Will be called when the player enters a marker that has a `data-ref` attribute. The value of `data-ref` will be passed to the function.
//   When leaving a marker that a `data-ref` attribute, and entering a marker without one (or not entering a new marker at all), the function will be called with `null`.
var vod_platform = {
    DIRECT:  0,
    VIMEO:   1,
    YOUTUBE: 2,
};

function
GetVODPlatformFromString(VODPlatformString)
{
    var Result = null;
    switch(VODPlatformString)
    {
        case "direct": Result = vod_platform.DIRECT; break;
        case "vimeo": Result = vod_platform.VIMEO; break;
        case "youtube": Result = vod_platform.YOUTUBE; break;
        default: break;
    }
    return Result;
}

function Player(htmlContainer, refsCallback) {
    this.container = htmlContainer;
    this.markersContainer = this.container.querySelector(".markers_container");
    this.videoContainer = this.container.querySelector(".video_container");
    this.refsCallback = refsCallback || function() {};

    if (!(this.videoContainer.getAttribute("data-platform") || this.videoContainer.getAttribute("data-videoId"))) {
        console.error("Expected to find data-platform and data-videoId attribute on", this.videoContainer, "for player initialized on", this.container);
        throw new Error("Missing data-platform or data-videoId attribute.");
    }
    this.markers = [];
    var markerEls = this.markersContainer.querySelectorAll(".marker");
    if (markerEls.length == 0) {
        console.error("No markers found in", this.markersContainer, "for player initialized on", this.container);
        throw new Error("Missing markers.");
    }
    for (var i = 0; i < markerEls.length; ++i) {
        var marker = {
            timestamp: parseInt(markerEls[i].getAttribute("data-timestamp"), 10),
            ref: markerEls[i].getAttribute("data-ref"),
            endTime: (i < markerEls.length - 1 ? parseInt(markerEls[i+1].getAttribute("data-timestamp"), 10) : null),
            el: markerEls[i],
            fadedProgress: markerEls[i].querySelector(".progress.faded"),
            progress: markerEls[i].querySelector(".progress.main"),
            hoverx: null
        };
        marker.el.addEventListener("click", this.onMarkerClick.bind(this, marker));
        marker.el.addEventListener("mousemove", this.onMarkerMouseMove.bind(this, marker));
        marker.el.addEventListener("mouseleave", this.onMarkerMouseLeave.bind(this, marker));
        this.markers.push(marker);
    }

    this.vod_platform = GetVODPlatformFromString(this.videoContainer.getAttribute("data-platform"));
    this.currentMarker = null;
    this.currentMarkerIdx = null;

    this.platformPlayer = null;
    this.platformPlayerReady = false;

    this.duration = null;
    this.playing = false;
    this.shouldPlay = false;
    this.buffering = false;
    this.pauseAfterBuffer = false;
    this.speed = 1;
    this.currentTime = -1;
    this.scrollTo = -1;
    this.scrollPosition = 0;
    this.nextFrame = null;
    this.looping = false;


    this.markersContainer.addEventListener("wheel", function(ev) {
        this.scrollTo = -1;
    }.bind(this));

    Player.initializePlatform(this.vod_platform, this.onPlatformReady.bind(this));

    var PendingMobileStyleInitialisation = true;
    this.updateSize(PendingMobileStyleInitialisation);
    this.resume();
}

// Start playing the video from the current position.
// If the player hasn't loaded yet, it will autoplay when ready.
Player.prototype.play = function() {
    if (this.platformPlayerReady) {
        if (!this.playing) {
            switch(this.vod_platform)
            {
                case vod_platform.DIRECT:
                    {
                        this.platformPlayer.play();
                    } break;
                case vod_platform.VIMEO:
                    {
                        this.platformPlayer.play();
                    } break;
                case vod_platform.YOUTUBE:
                    {
                        this.platformPlayer.playVideo();
                    } break;
            }
            this.pauseAfterBuffer = false;
        } else {
            this.shouldPlay = true;
        }
    }
};

// Pause the video at the current position.
// If the player hasn't loaded yet, it will not autoplay when ready. (This is the default)
Player.prototype.pause = function() {
    if (this.platformPlayerReady) {
        if (this.playing) {
            switch(this.vod_platform)
            {
                case vod_platform.DIRECT:
                    {
                        this.platformPlayer.pause();
                    } break;
                case vod_platform.VIMEO:
                    {
                        this.platformPlayer.pause();
                    } break;
                case vod_platform.YOUTUBE:
                    {
                        this.platformPlayer.pauseVideo();
                    } break;
            }
        } else if (this.buffering) {
            this.pauseAfterBuffer = true;
        }
    } else {
        this.shouldPlay = false;
    }
};

// Sets the current time then plays.
// If the player hasn't loaded yet, it will seek to this time when ready.
Player.prototype.setTimeThenPlay = function(time) {
    this.currentTime = time;
    switch(this.vod_platform)
    {
        case vod_platform.DIRECT:
            {
                if (this.platformPlayerReady) {
                    this.currentTime = Math.max(0, Math.min(this.currentTime, this.duration));
                    this.platformPlayer.currentTime = this.currentTime;
                    this.updateProgress();
                    this.play();
                }
            } break;
        case vod_platform.VIMEO:
            {
                if (this.platformPlayerReady) {
                    this.currentTime = Math.max(0, Math.min(this.currentTime, this.duration));
                    var Parent = this;
                    this.platformPlayer.setCurrentTime(this.currentTime)
                        .then(function() {
                            Parent.updateProgress();
                            Parent.play();
                        });
                }
            } break;
        case vod_platform.YOUTUBE:
            {
                if (this.platformPlayerReady) {
                    this.currentTime = Math.max(0, Math.min(this.currentTime, this.duration));
                    this.platformPlayer.seekTo(this.currentTime);
                    this.updateProgress();
                    this.play();
                }
            } break;
    }
};

Player.prototype.jumpToNextMarker = function() {
    var targetMarkerIdx = Math.min((this.currentMarkerIdx === null ? 0 : this.currentMarkerIdx + 1), this.markers.length-1);
    var targetTime = this.markers[targetMarkerIdx].timestamp;
    while(targetMarkerIdx < this.markers.length && this.markers[targetMarkerIdx].el.classList.contains("skip"))
    {
        ++targetMarkerIdx;
        targetTime = this.markers[targetMarkerIdx].timestamp;
    }
    this.setTimeThenPlay(targetTime);
};

Player.prototype.jumpToPrevMarker = function() {
    var targetMarkerIdx = Math.max(0, (this.currentMarkerIdx === null ? 0 : this.currentMarkerIdx - 1));
    var targetTime = this.markers[targetMarkerIdx].timestamp;
    while(targetMarkerIdx >= 0 && this.markers[targetMarkerIdx].el.classList.contains("skip"))
    {
        --targetMarkerIdx;
        targetTime = this.markers[targetMarkerIdx].timestamp;
    }
    this.setTimeThenPlay(targetTime);
};

function
GetHeightOfHideableElement(Element, UnhidingClass)
{
    var Result = 0;
    if(Element.classList.contains(UnhidingClass))
    {
        Result = Element.offsetHeight;
    }
    else
    {
        var ZOffset = Element.style.zOffset;
        Element.style.zOffset = -1;
        Element.classList.add(UnhidingClass);

        Result = Element.offsetHeight;

        Element.classList.remove(UnhidingClass);
        Element.style.zOffset = ZOffset;
    }
    return Result;
}

function
GetWidthOfHideableElement(Element, UnhidingClass)
{
    var Result = 0;
    if(Element.classList.contains(UnhidingClass))
    {
        Result = Element.offsetWidth;
    }
    else
    {
        var ZOffset = Element.style.zOffset;
        Element.style.zOffset = -1;
        Element.classList.add(UnhidingClass);

        Result = Element.offsetWidth;

        Element.classList.remove(UnhidingClass);
        Element.style.zOffset = ZOffset;
    }
    return Result;
}

function
ComputeVerticalOffsetForMenu(Menu, Toggler, VideoContainerDimY)
{
    var Result = 0;
    var MenuHeight = GetHeightOfHideableElement(Menu, "visible");
    var TogglerHeight = Toggler.offsetHeight;

    var TogglerOffset = Toggler.offsetTop;
    var Result = TogglerOffset + (TogglerHeight / 2) - (MenuHeight / 2);

    var LowerProtrusion = MenuHeight + Result - VideoContainerDimY;
    if(LowerProtrusion > 0)
    {
        Result -= LowerProtrusion;
    }

    if(Result < 0)
    {
        Result = 0;
    }
    return Result;
}

function sizeAndPositionMenuContainer(TitleBar, SizerElement, Menu)
{
    if(Menu)
    {
        var Toggler = Menu.parentElement;

        var TitleBarDimX = TitleBar.offsetWidth;
        var TitleBarDimY = TitleBar.offsetHeight;
        var SizerElementDimX = SizerElement.offsetWidth;
        var SizerElementDimY = SizerElement.offsetHeight;

        var ContainerDimX = SizerElementDimX;
        var ContainerDimY = SizerElementDimY;

        switch(CineraProps.O)
        {
            case orientations.PORTRAIT:
                {
                    Menu.style.borderTopWidth = 0;
                    Menu.style.borderTopStyle = "none";
                    Menu.style.borderRightWidth = "1px";
                    Menu.style.borderRightStyle = "solid";
                    Menu.style.borderLeftWidth = "1px";
                    Menu.style.borderLeftStyle = "solid";

                    Menu.style.maxWidth = ContainerDimX + "px";
                    ContainerDimY -= TitleBarDimY;
                    Menu.style.maxHeight = ContainerDimY + "px";

                    Menu.style.top = TitleBarDimY + "px";
                    Menu.style.left = 0 + "px";
                } break;
            case orientations.LANDSCAPE_LEFT:
                {
                    Menu.style.borderTopWidth = "1px";
                    Menu.style.borderTopStyle = "solid";
                    Menu.style.borderRightWidth = "1px";
                    Menu.style.borderRightStyle = "solid";
                    Menu.style.borderLeftWidth = 0;
                    Menu.style.borderLeftStyle = "none";

                    ContainerDimX -= TitleBarDimX;
                    Menu.style.maxWidth = ContainerDimX + "px";
                    Menu.style.maxHeight = ContainerDimY + "px";

                    var MenuVerticalOffset = ComputeVerticalOffsetForMenu(Menu, Toggler, SizerElementDimY);

                    Menu.style.top = MenuVerticalOffset + "px";
                    Menu.style.left = TitleBarDimX + "px";
                } break;
            case orientations.LANDSCAPE_RIGHT:
                {
                    Menu.style.borderTopWidth = "1px";
                    Menu.style.borderTopStyle = "solid";
                    Menu.style.borderRightWidth = 0;
                    Menu.style.borderRightStyle = "none";
                    Menu.style.borderLeftWidth = "1px";
                    Menu.style.borderLeftStyle = "solid";

                    ContainerDimX -= TitleBarDimX;
                    Menu.style.maxWidth = ContainerDimX + "px";
                    Menu.style.maxHeight = ContainerDimY + "px";

                    var MenuVerticalOffset = ComputeVerticalOffsetForMenu(Menu, Toggler, SizerElementDimY);

                    Menu.style.top = MenuVerticalOffset + "px";
                    var MenuWidth = GetWidthOfHideableElement(Menu, "visible");
                    Menu.style.left = -MenuWidth + "px";
                } break;

        }
    }
}

function
ComputeTallest(Elements, UnhidingClass)
{
    var Result = null;
    for(var i = 0; i < Elements.length; ++i)
    {
        var This = Elements[i];
        var Height = UnhidingClass ? GetHeightOfHideableElement(This, UnhidingClass) : This.offsetHeight;
        if(Height > Result)
        {
            Result = Height;
        }
    }
    return Result;
}

function
ComputeAndSetTallest(Selector, Elements, UnhidingClass)
{
    var Result;
    Selector.style.height = "unset";
    Result = ComputeTallest(Elements, UnhidingClass);
    Selector.style.height = Result + "px";
    return Result;
}

function ApplyMobileStyle(VideoContainer)
{
    var WindowDim = DeriveReliableWindowDimensions();
    var MaxWidth = MaxWidthOfElement(cinera, WindowDim);
    var MaxHeight = MaxHeightOfElement(cinera, WindowDim);

    var IndicesBar = playerContainer.querySelector(".markers_container");

    var Markers = IndicesBar.querySelector(".markers");
    var CineraContentWidth = MaxWidth;

    var EpisodeMarkers = IndicesBar.querySelectorAll(".episodeMarker");
    for(var i = 0; i < EpisodeMarkers.length; ++i)
    {
        CineraContentWidth -= EpisodeMarkers[i].offsetWidth;
    }

    switch(CineraProps.O)
    {
        case orientations.PORTRAIT:
            {
                cinera.style.flexDirection = "column";
                titleBar.style.flexDirection = "row";
            } break;
        case orientations.LANDSCAPE_LEFT:
            {
                cinera.style.flexDirection = "row";
                titleBar.style.flexDirection = "column-reverse";
                CineraContentWidth -= titleBar.offsetWidth;
            } break;
        case orientations.LANDSCAPE_RIGHT:
            {
                cinera.style.flexDirection = "row-reverse";
                titleBar.style.flexDirection = "column";
                CineraContentWidth -= titleBar.offsetWidth;
            } break;
    }

    var HeightOfTallestIndex;
    if(MobileCineraContentRule !== undefined)
    {
        MobileCineraContentRule.style.width = CineraContentWidth + "px";
        var MarkerList = Markers.querySelectorAll(".marker");
        HeightOfTallestIndex = ComputeAndSetTallest(MobileCineraContentRule, MarkerList, "current");
        IndicesBar.style.height = HeightOfTallestIndex + "px";
        Markers.style.width = CineraContentWidth + "px";
    }

    var VideoMaxDimX = MaxWidth;
    var VideoMaxDimY = MaxHeight;
    var MinimumVideoHeight = 32;
    if(MaxHeight - HeightOfTallestIndex > MinimumVideoHeight)
    {
        VideoMaxDimY -= HeightOfTallestIndex;
    }

    switch(CineraProps.O)
    {
        case orientations.PORTRAIT:
            {
                VideoMaxDimY -= titleBar.offsetHeight;
            } break;
        case orientations.LANDSCAPE_LEFT:
        case orientations.LANDSCAPE_RIGHT:
            {
                VideoMaxDimX -= titleBar.offsetWidth;
            } break;
    }

    var VideoDimYFromMaxX = VideoMaxDimX * 9 / 16;
    var VideoDimXFromMaxY = VideoMaxDimY * 16 / 9;

    var VideoDimX = 0;
    var VideoDimY = 0;
    if(VideoDimXFromMaxY > VideoMaxDimX)
    {
        VideoDimX = Math.floor(VideoMaxDimX);
        VideoDimY = Math.floor(VideoDimYFromMaxX);
    }
    else if(VideoDimYFromMaxX > VideoMaxDimY)
    {
        VideoDimY = Math.floor(VideoMaxDimY);
        VideoDimX = Math.floor(VideoDimXFromMaxY);
    }
    else
    {
        VideoDimX = Math.floor(VideoMaxDimX);
        VideoDimY = Math.floor(VideoDimYFromMaxX);
    }

    VideoContainer.style.width = VideoDimX + "px";
    VideoContainer.style.height = VideoDimY + "px";

    sizeAndPositionMenuContainer(titleBar, cinera, quotesMenu);
    sizeAndPositionMenuContainer(titleBar, cinera, referencesMenu);
    sizeAndPositionMenuContainer(titleBar, cinera, filterMenu);
    sizeAndPositionMenuContainer(titleBar, cinera, linkMenu);
    sizeAndPositionMenuContainer(titleBar, cinera, creditsMenu);
}

function
IconifyMenuTogglers()
{
    if(quotesMenu)
    {
        quotesMenu.previousElementSibling.textContent = '\u{1F5E9}';
    }

    if(referencesMenu)
    {
        referencesMenu.previousElementSibling.textContent = '\u{1F4D6}';
    }

    if(creditsMenu)
    {
        creditsMenu.previousElementSibling.textContent = '\u{1F46A}';
    }

    if(viewsMenu)
    {
        viewsMenu.remove();
        viewsMenu = null;
    }
}

function
InitMobileControls()
{
    var rightmost = {};
    var markersContainer = cinera.querySelector(".markers_container");
    markersContainer.style.height = "auto";
    var episodeMarkerFirst = markersContainer.querySelector(".episodeMarker.first");
    var episodeMarkerPrev = markersContainer.querySelector(".episodeMarker.prev");
    var episodeMarkerNext = markersContainer.querySelector(".episodeMarker.next");
    var episodeMarkerLast = markersContainer.querySelector(".episodeMarker.last");

    if(episodeMarkerPrev) { episodeMarkerPrev.firstChild.textContent = '\u{23EE}'; }
    if(episodeMarkerNext) { episodeMarkerNext.firstChild.textContent = '\u{23ED}'; rightmost = episodeMarkerNext; }
    else if (episodeMarkerLast) { rightmost = episodeMarkerLast; }

    var controlPrevTimestamp = document.createElement("a");
    controlPrevTimestamp.classList.add("episodeMarker");
    controlPrevTimestamp.classList.add("prevTimestamp");
    var controlPrevTimestampContent = document.createElement("div");
    controlPrevTimestampContent.appendChild(document.createTextNode('\u{25C0}'));
    controlPrevTimestamp.appendChild(controlPrevTimestampContent);

    var markers = markersContainer.querySelector(".markers");
    markersContainer.insertBefore(controlPrevTimestamp, markers);

    var controlNextTimestamp = document.createElement("a");
    controlNextTimestamp.classList.add("episodeMarker");
    controlNextTimestamp.classList.add("nextTimestamp");
    var controlNextTimestampContent = document.createElement("div");
    controlNextTimestampContent.appendChild(document.createTextNode('\u{25B6}'));
    controlNextTimestamp.appendChild(controlNextTimestampContent);

    if(rightmost)
    {
        markersContainer.insertBefore(controlNextTimestamp, rightmost);
    }
    else
    {
        markersContainer.appendChild(controlNextTimestamp);
    }
}

function InitMobileStyle()
{
    cinera.classList.add("mobile");
    IconifyMenuTogglers();
    InitMobileControls();
    var VideoContainer = cinera.querySelector(".video_container");
    ApplyMobileStyle(VideoContainer);
}

function
ConnectMobileControls(player)
{
    var markersContainer = player.markersContainer;
    var ControlPrevTimestamp = markersContainer.querySelector(".episodeMarker.prevTimestamp");
    ControlPrevTimestamp.addEventListener("click", function(ev) {
        player.jumpToPrevMarker();
    });
    var ControlNextTimestamp = markersContainer.querySelector(".episodeMarker.nextTimestamp");
    ControlNextTimestamp.addEventListener("click", function(ev) {
        player.jumpToNextMarker();
    });
}

// Call this after changing the size of the video container in order to update the platform player.
Player.prototype.updateSize = function() {
    var width = 0;
    var height = 0;
    CineraProps.O = GetRealOrientation(orientations.LANDSCAPE_LEFT, CineraProps.IsMobile);
    if(!CineraProps.IsMobile)
    {
        var VisibleArea = MaxDimensionsOfElement(this.container, GetWindowDim(false));
        var AvailableHeight = VisibleArea.Y - titleBar.offsetHeight;
        var VerticalScrollBarWidth = this.markersContainer.offsetWidth - this.markersContainer.clientWidth;
        width = VisibleArea.X - (this.markersContainer.scrollWidth + VerticalScrollBarWidth);
        height = width / 16 * 9; // TODO(matt): Get the aspect ratio from the video itself?
        if(height > AvailableHeight)
        {
            height = AvailableHeight;
            width = height / 9 * 16;
        }
        this.markersContainer.style.height = height + "px";

        var VacantPixelsBelowMenus = 4;
        var MenuMaxHeight = cinera.offsetHeight - titleBar.offsetHeight - VacantPixelsBelowMenus;
        MenuContainerRule.style.maxHeight = MenuMaxHeight + "px";
    }
    else
    {
        ApplyMobileStyle(this.videoContainer);
        width = this.videoContainer.offsetWidth;
        height = this.videoContainer.offsetHeight;
    }

    if(this.platformPlayerReady)
    {
        switch(this.vod_platform)
        {
            case vod_platform.DIRECT:
                {
                    this.platformPlayer.setAttribute("width", Math.floor(width));
                    this.platformPlayer.setAttribute("height", Math.floor(height));
                } break;
            case vod_platform.VIMEO: break; // NOTE(matt): It responds automatically
            case vod_platform.YOUTUBE:
                {
                    this.platformPlayer.setSize(Math.floor(width), Math.floor(height));
                } break;
            default: break;
        }
    }
}

// Stops the per-frame work that the player does. Call when you want to hide or get rid of the player.
Player.prototype.halt = function() {
    this.pause();
    this.looping = false;
    if (this.nextFrame) {
        cancelAnimationFrame(this.nextFrame);
        this.nextFrame = null;
    }
}

// Resumes the per-frame work that the player does. Call when you want to show the player again after hiding.
Player.prototype.resume = function() {
    this.looping = true;
    if (!this.nextFrame) {
        this.doFrame();
    }
}

Player.initializePlatform = function(platform_id, callback) {
    switch(platform_id)
    {
        case vod_platform.DIRECT:
        case vod_platform.VIMEO:
            {
                callback();
            } break;
        case vod_platform.YOUTUBE:
            {
                if(window.YT && window.YT.loaded)
                {
                    callback()
                }
                else
                {
                    if (window.APYoutubeAPIReady === undefined) {
                        window.APYoutubeAPIReady = false;
                        window.APCallbacks = (callback ? [callback] : []);
                        window.onYouTubeIframeAPIReady = function() {
                            window.APYoutubeAPIReady = true;
                            for (var i = 0; i < APCallbacks.length; ++i) {
                                APCallbacks[i]();
                            }
                        };
                    } else if (window.APYoutubeAPIReady === false) {
                        window.APCallbacks.push(callback);
                    } else if (window.APYoutubeAPIReady === true) {
                        callback();
                    }
                }
            } break;
    }
}

// END PUBLIC INTERFACE

Player.prototype.onMarkerClick = function(marker, ev) {
    var time = marker.timestamp;
    if (this.currentMarker == marker && marker.hoverx !== null) {
        time += (marker.endTime - marker.timestamp) * marker.hoverx;
    }
    this.setTimeThenPlay(time);
};

Player.prototype.onMarkerMouseMove = function(marker, ev) {
    if (this.currentMarker == marker) {
        var CineraContent = this.currentMarker.el.querySelector(".cineraContent");
        marker.hoverx = (ev.pageX - getElementXOffsetFromPage(CineraContent)) / CineraContent.offsetWidth;
    }
};

Player.prototype.onMarkerMouseLeave = function(marker, ev) {
    marker.hoverx = null;
};

Player.prototype.updateProgress = function() {
    var prevMarker = this.currentMarker;
    this.currentMarker = null;
    this.currentMarkerIdx = null;

    for (var i = 0; i < this.markers.length; ++i) {
        var marker = this.markers[i];
        if (marker.timestamp <= this.currentTime && this.currentTime < marker.endTime) {
            this.currentMarker = marker;
            this.currentMarkerIdx = i;
            break;
        }
    }

    if (this.currentMarker) {
        var CineraContent = this.currentMarker.el.querySelector(".cineraContent");
        var totalWidth = CineraContent.offsetWidth;
        var progress = (this.currentTime - this.currentMarker.timestamp) / (this.currentMarker.endTime - this.currentMarker.timestamp);
        if (this.currentMarker.hoverx === null) {
            var pixelWidth = progress * totalWidth;
            this.currentMarker.fadedProgress.style.width = Math.ceil(pixelWidth) + "px";
            this.currentMarker.fadedProgress.style.opacity = pixelWidth - Math.floor(pixelWidth);
            this.currentMarker.progress.style.width = Math.floor(pixelWidth) + "px";
        } else {
            this.currentMarker.fadedProgress.style.opacity = 1;
            this.currentMarker.progress.style.width = Math.floor(Math.min(this.currentMarker.hoverx, progress) * totalWidth) + "px";
            this.currentMarker.fadedProgress.style.width = Math.floor(Math.max(this.currentMarker.hoverx, progress) * totalWidth) + "px";
        }

    }

    if (this.currentMarker != prevMarker) {
        if (prevMarker) {
            prevMarker.el.classList.remove("current");
            prevMarker.fadedProgress.style.width = "0px";
            prevMarker.progress.style.width = "0px";
            prevMarker.hoverx = null;
        }

        if (this.currentMarker) {
            if(this.currentMarkerIdx == this.markers.length - 1)
            {
                localStorage.removeItem(lastTimestampStorageItem);
            }
            else
            {
                localStorage.setItem(lastTimestampStorageItem, this.currentMarker.timestamp);
            }
            this.currentMarker.el.classList.add("current");
            this.scrollTo = this.currentMarker.el.offsetTop + this.currentMarker.el.offsetHeight/2.0;
            this.scrollPosition = this.markersContainer.scrollTop;
            this.refsCallback(this.currentMarker.ref, this.currentMarker.el, this);
        } else if (prevMarker && prevMarker.ref) {
            this.refsCallback(null);
        }
    }
};

Player.prototype.doFrame = function() {
    if (this.playing) {
        switch(this.vod_platform)
        {
            case vod_platform.DIRECT:
                {
                    this.currentTime = this.platformPlayer.currentTime;
                    this.updateProgress();
                } break;
            case vod_platform.VIMEO:
                {
                    var Parent = this;
                    this.platformPlayer.getCurrentTime()
                        .then(function(Result) {
                            Parent.currentTime = Result;
                            Parent.updateProgress();
                        });
                } break;
            case vod_platform.YOUTUBE:
                {
                    this.currentTime = this.platformPlayer.getCurrentTime();
                    this.updateProgress();
                } break;
        }
    }

    if (this.scrollTo >= 0) {
        var targetPosition = this.scrollTo - this.markersContainer.offsetHeight/2.0;
        targetPosition = Math.max(0, Math.min(targetPosition, this.markersContainer.scrollHeight - this.markersContainer.offsetHeight));
        this.scrollPosition += (targetPosition - this.scrollPosition) * 0.1;
        if (Math.abs(this.scrollPosition - targetPosition) < 1.0) {
            this.markersContainer.scrollTop = targetPosition;
            this.scrollTo = -1;
        } else {
            this.markersContainer.scrollTop = this.scrollPosition;
        }
    }

    this.nextFrame = requestAnimationFrame(this.doFrame.bind(this));
    updateLink();
};

Player.prototype.setStyleAndQuality = function() {
    switch(this.vod_platform)
    {
        case vod_platform.DIRECT:
            {
                // NOTE(matt): onPlatformReady() has set the width and height
            } break;
        case vod_platform.VIMEO:
            {
                this.platformPlayer.setQuality("1080p");
                var frame = this.videoContainer.querySelector("iframe");
                frame.style.width = "100%";
                frame.style.height = "100%";
                frame.style.position = "absolute"
                frame.style.top = 0;
                frame.style.left = 0;
            } break;
        case vod_platform.YOUTUBE:
            {
                this.platformPlayer.setPlaybackQuality("hd1080");
            } break;
    }
    this.updateSize();
}

Player.prototype.setDurationThenAutoplay = function(Duration) {
    this.duration = Duration;
    this.markers[this.markers.length-1].endTime = this.duration;
    if (this.currentTime > 0) {
        this.currentTime = Math.max(0, Math.min(this.currentTime, this.duration));
        this.setTimeThenPlay(this.currentTime);
    }
    if (this.shouldPlay) {
        this.play();
    }
}

Player.prototype.acquireDurationThenAutoplay = function() {
    switch(this.vod_platform)
    {
        case vod_platform.DIRECT:
            {
                this.setDurationThenAutoplay(this.platformPlayer.duration);
            } break;
        case vod_platform.VIMEO:
            {
                var Parent = this;
                this.platformPlayer.getDuration()
                    .then(function(Response)
                        {
                            Parent.setDurationThenAutoplay(Response);
                        });
            } break;
        case vod_platform.YOUTUBE:
            {
                this.setDurationThenAutoplay(this.platformPlayer.getDuration());
            } break;
    }
}

Player.prototype.onPlatformPlayerReady = function() {
    this.platformPlayerReady = true;
    this.setStyleAndQuality();
    this.acquireDurationThenAutoplay();
};

Player.prototype.onPlaybackRateChange = function(Rate)
{
    this.speed = Rate;
}

Player.prototype.onDirectPlayerPlaybackRateChange = function(ev) {
    this.onPlaybackRateChange(this.platformPlayer.playbackRate);
};

Player.prototype.onVimeoPlayerPlaybackRateChange = function(ev) {
    this.onPlaybackRateChange(ev.playbackRate);
};

Player.prototype.onYouTubePlayerPlaybackRateChange = function(ev) {
    this.onPlaybackRateChange(ev.data);
};

Player.prototype.onStateBufferStart = function()
{
    this.buffering = true;
    this.updateProgress();
}

Player.prototype.onStateBufferEnd = function()
{
    this.buffering = false;
    this.updateProgress();
}

Player.prototype.onStateEnded = function()
{
    this.buffering = false;
    this.playing = false;
    localStorage.removeItem(lastTimestampStorageItem);
    this.currentTime = null;
    this.updateProgress();
}

Player.prototype.onStatePaused = function(CurrentTime)
{
    this.buffering = false;
    this.playing = false;
    this.currentTime = CurrentTime;
    this.updateProgress();
}

Player.prototype.onStatePlaying = function(CurrentTime)
{
    this.buffering = false;
    this.playing = true;
    this.currentTime = CurrentTime;
    if(this.pauseAfterBuffer)
    {
        this.pauseAfterBuffer = false;
        this.pause();
    }
}

Player.prototype.onDirectPlayerStateChange_Paused = function(ev)
{
    this.onStatePaused(this.platformPlayer.currentTime);
}

Player.prototype.onDirectPlayerStateChange_Playing = function(ev)
{
    this.onStatePlaying(this.platformPlayer.currentTime);
}

Player.prototype.onVimeoPlayerStateChange_Paused = function(ev)
{
    this.onStatePaused(ev.seconds);
}

Player.prototype.onVimeoPlayerStateChange_Playing = function(ev)
{
    this.onStatePlaying(ev.seconds);
}

Player.prototype.onYouTubePlayerStateChange = function(ev) {
    switch(ev.data)
    {
        case YT.PlayerState.BUFFERING: { this.onStateBufferStart(); }; break;
        case YT.PlayerState.ENDED: { this.onStateEnded(); }; break;
        case YT.PlayerState.PAUSED: { this.onStatePaused(this.platformPlayer.getCurrentTime()); }; break;
        case YT.PlayerState.PLAYING: { this.onStatePlaying(this.platformPlayer.getCurrentTime()); }; break;
        default: break;
    }
};

Player.prototype.onPlatformReady = function() {
    var platformPlayerDiv = document.createElement("DIV");
    platformPlayerDiv.id = "platform_player_" + Player.platformPlayerCount++;
    var platformPlayerDivPlaced = this.videoContainer.appendChild(platformPlayerDiv);

    switch(this.vod_platform)
    {
        case vod_platform.DIRECT:
            {
                platformPlayerDivPlaced.classList.add("direct_video");
                var videoNode = document.createElement("VIDEO");
                videoNode.controls = true;
                videoNode.setAttribute("width", this.videoContainer.offsetWidth);
                videoNode.setAttribute("height", this.videoContainer.offsetWidth / 16 * 9);
                var videoSourceNode = document.createElement("SOURCE");
                videoSourceNode.setAttribute("src", this.videoContainer.getAttribute("data-videoId"));
                videoNode.appendChild(videoSourceNode);
                this.platformPlayer = platformPlayerDiv.appendChild(videoNode);
                this.platformPlayer.addEventListener("loadedmetadata", this.onPlatformPlayerReady.bind(this));
                this.platformPlayer.addEventListener("ratechange", this.onDirectPlayerPlaybackRateChange.bind(this));
                this.platformPlayer.addEventListener("play", this.onDirectPlayerStateChange_Playing.bind(this));
                this.platformPlayer.addEventListener("pause", this.onDirectPlayerStateChange_Paused.bind(this));
                this.platformPlayer.addEventListener("waiting", this.onStateBufferStart.bind(this));
                this.platformPlayer.addEventListener("playing", this.onStateBufferEnd.bind(this));
                this.platformPlayer.addEventListener("ended", this.onStateEnded.bind(this));
            } break;
        case vod_platform.VIMEO:
            {
                this.videoContainer.style.position = "relative";
                this.videoContainer.style.alignSelf = "unset";

                var CallData = {
                    id: this.videoContainer.getAttribute("data-videoId"),
                    title: false,
                };
                var CCLang = this.videoContainer.getAttribute("data-ccLang");
                if(CCLang != null)
                {
                    CallData.texttrack = CCLang;
                }

                this.platformPlayer = new Vimeo.Player(platformPlayerDiv.id, CallData);

                this.platformPlayer.ready()
                    .then(this.onPlatformPlayerReady.bind(this));
                this.platformPlayer.on("playbackratechange", this.onVimeoPlayerPlaybackRateChange.bind(this));
                this.platformPlayer.on("play", this.onVimeoPlayerStateChange_Playing.bind(this));
                this.platformPlayer.on("pause", this.onVimeoPlayerStateChange_Paused.bind(this));
                this.platformPlayer.on("bufferstart", this.onStateBufferStart.bind());
                this.platformPlayer.on("bufferend", this.onStateBufferEnd.bind());
                this.platformPlayer.on("ended", this.onStateEnded.bind());
            } break;
        case vod_platform.YOUTUBE:
            {
                var CallData = {
                    videoId: this.videoContainer.getAttribute("data-videoId"),
                    width: this.videoContainer.offsetWidth,
                    height: this.videoContainer.offsetWidth / 16 * 9,
                    playerVars: { 'playsinline': 1 },
                    events: {
                        "onReady": this.onPlatformPlayerReady.bind(this),
                        "onStateChange": this.onYouTubePlayerStateChange.bind(this),
                        "onPlaybackRateChange": this.onYouTubePlayerPlaybackRateChange.bind(this)
                    }
                };
                var CCLang = this.videoContainer.getAttribute("data-ccLang");
                if(CCLang != null)
                {
                    CallData.cc_lang_pref = CCLang;
                    CallData.cc_load_policy = 1;
                }

                this.platformPlayer = new YT.Player(platformPlayerDiv.id, CallData);
            } break;
    }
};

Player.platformPlayerCount = 0;

function toggleFilterMode() {
    if(filterMode == "inclusive")
    {
        filterModeElement.classList.remove("inclusive");
        filterModeElement.classList.add("exclusive");
        filterMode = "exclusive";
    }
    else
    {
        filterModeElement.classList.remove("exclusive");
        filterModeElement.classList.add("inclusive");
        filterMode = "inclusive";
    }
    applyFilter();
}

function updateLink()
{
    if(link && player)
    {
        if(linkTimestamp == true)
        {
            if(player.currentMarker)
            {
                link.value = baseURL + "#" + player.currentMarker.timestamp;
            }
            else
            {
                link.value = baseURL;
            }
        }
        else
        {
            switch(player.vod_platform)
            {
                case vod_platform.DIRECT:
                    {
                        link.value = baseURL + "#" + Math.round(player.platformPlayer.currentTime);
                    } break;
                case vod_platform.VIMEO:
                    {
                        player.platformPlayer.getCurrentTime()
                            .then(function(Response)
                                {
                                    link.value = baseURL + "#" + Math.round(Response);
                                });
                    } break;
                case vod_platform.YOUTUBE:
                    {
                        link.value = baseURL + "#" + Math.round(player.platformPlayer.getCurrentTime());
                    } break;
            }
        }
    }
}

function toggleLinkMode(linkMode, link)
{
    linkTimestamp = !linkTimestamp;
    if(linkTimestamp == true)
    {
        linkMode.textContent = "Link to: current timestamp";
    }
    else
    {
        linkMode.textContent = "Link to: nearest second";
    }
    updateLink();
}

function toggleFilterOrLinkMode()
{
    for(menuIndex in menuState)
    {
        if(menuState[menuIndex].classList.contains("filter_container") && menuState[menuIndex].classList.contains("visible"))
        {
            toggleFilterMode();
        }
        if(menuState[menuIndex].classList.contains("link_container") && menuState[menuIndex].classList.contains("visible"))
        {
            toggleLinkMode(linkMode, link);
        }
    }
}

function toggleMenuVisibility(element) {
    if(element.classList.contains("visible"))
    {
        element.classList.remove("visible");
        element.parentNode.classList.remove("visible");
        if(focusedElement)
        {
            focusedElement.classList.remove("focused");
            focusedElement = null;
        }
        if(focusedIdentifier)
        {
            focusedIdentifier.classList.remove("focused");
            focusedIdentifier = null;
        }
    }
    else
    {
        for(menuIndex in menuState)
        {
            menuState[menuIndex].classList.remove("visible");
            menuState[menuIndex].parentNode.classList.remove("visible");
            if(focusedElement)
            {
                focusedElement.classList.remove("focused");
            }
            if(focusedIdentifier)
            {
                focusedIdentifier.classList.remove("focused");
            }
        }
        element.classList.add("visible");
        element.parentNode.classList.add("visible");

        if(element.classList.contains("quotes_container"))
        {
            if(!lastFocusedQuote)
            {
                lastFocusedQuote = element.querySelectorAll(".ref")[0];
            }
            focusedElement = lastFocusedQuote;
            focusedElement.classList.add("focused");
        }
        else if(element.classList.contains("references_container"))
        {
            if(!lastFocusedReference || !lastFocusedIdentifier)
            {
                lastFocusedReference = element.querySelectorAll(".ref")[0];
                lastFocusedIdentifier = lastFocusedReference.querySelector(".ref_indices").firstElementChild;
            }
            focusedElement = lastFocusedReference;
            focusedElement.classList.add("focused");
            focusedIdentifier = lastFocusedIdentifier;
            focusedIdentifier.classList.add("focused");
        }
        else if(element.classList.contains("filter_container"))
        {
            if(!lastFocusedCategory)
            {
                lastFocusedCategory = element.querySelectorAll(".filter_content")[0];
            }
            focusedElement = lastFocusedCategory;
            focusedElement.classList.add("focused");
        }
        else if(element.classList.contains("credits_container"))
        {
            if(!lastFocusedCreditItem)
            {
                if(element.querySelectorAll(".credit .person")[0].nextElementSibling)
                {
                    lastFocusedCreditItem = element.querySelectorAll(".credit .support")[0];
                    focusedElement = lastFocusedCreditItem;
                    focusedElement.classList.add("focused");
                    setSpriteLightness(focusedElement.firstChild);
                }
                else
                {
                    lastFocusedCreditItem = element.querySelectorAll(".credit .person")[0];
                    focusedElement = lastFocusedCreditItem;
                    focusedElement.classList.add("focused");
                }
            }
            else
            {
                focusedElement = lastFocusedCreditItem;
                focusedElement.classList.add("focused");
            }
        }
    }
}

function handleMouseOverViewsMenu()
{
    switch(CineraProps.V)
    {
        case views.REGULAR:
        case views.THEATRE:
            {
                viewsContainer.style.display = "block";
            } break;
        case views.SUPERTHEATRE:
            {
                viewsContainer.style.display = "none";
            } break;
    }
}

function IsFullScreen()
{
    return (document.fullscreen || document.webkitIsFullScreen || document.mozFullScreen || document.msFullscreenElement || document.fullscreenElement);
}

function enterFullScreen_()
{
    if(!IsFullScreen())
    {
        if(document.body.requestFullscreen) { document.body.requestFullscreen(); }
        else if(document.body.mozRequestFullScreen) { document.body.mozRequestFullScreen(); }
        else if(document.body.webkitRequestFullScreen) { document.body.webkitRequestFullScreen(); }
        else if(document.body.msRequestFullscreen) { document.body.msRequestFullscreen(); }
    }
}

function leaveFullScreen_()
{
    if(IsFullScreen())
    {
        if(document.exitFullscreen) { document.exitFullscreen(); }
        else if(document.mozCancelFullScreen) { document.mozCancelFullScreen(); }
        else if(document.webkitCancelFullScreen) { document.webkitCancelFullScreen(); }
        else if(document.msExitFullscreen) { document.msExitFullscreen(); }
    }
}

function toggleTheatreMode() {
    switch(CineraProps.V)
    {
        case views.REGULAR:
            {
                CineraProps.C = cinera.style.backgroundColor;
                CineraProps.Z = cinera.style.zIndex;
                CineraProps.X = cinera.style.left;
                CineraProps.Y = cinera.style.top;
                CineraProps.W = cinera.style.width;
                CineraProps.mW = cinera.style.maxWidth;
                CineraProps.H = cinera.style.height;
                CineraProps.mH = cinera.style.maxHeight;
                CineraProps.P = cinera.style.position;
                CineraProps.Display = cinera.style.display;
                CineraProps.FlexDirection = cinera.style.flexDirection;
                CineraProps.JustifyContent = cinera.style.justifyContent;
                CineraProps.ScrollX = window.scrollX;
                CineraProps.ScrollY = window.scrollY;

                cinera.style.backgroundColor = "#000";
                cinera.style.zIndex = 64;
                cinera.style.left = 0;
                cinera.style.top = 0;
                cinera.style.width = "100%";
                cinera.style.maxWidth = "100%";
                cinera.style.height = "100%";
                cinera.style.maxHeight = "100%";
                cinera.style.position = "fixed";
                cinera.style.display = "flex";
                cinera.style.flexDirection = "column";
                cinera.style.justifyContent = "center";

                viewItems[0].setAttribute("data-id", "regular");
                viewItems[0].setAttribute("title", "Regular mode");
                viewItems[0].firstChild.nodeValue = "📺";
            } CineraProps.V = views.THEATRE; localStorage.setItem(cineraViewStorageItem, views.THEATRE); break;
        case views.SUPERTHEATRE:
            {
                leaveFullScreen_();
            }
        case views.THEATRE:
            {
                cinera.style.backgroundColor = CineraProps.C;
                cinera.style.zIndex = CineraProps.Z;
                cinera.style.left = CineraProps.X;
                cinera.style.top = CineraProps.Y;
                cinera.style.width = CineraProps.W;
                cinera.style.maxWidth = CineraProps.mW;
                cinera.style.height = CineraProps.H;
                cinera.style.maxHeight = CineraProps.mH;
                cinera.style.position = CineraProps.P;
                cinera.style.display = CineraProps.Display;
                cinera.style.flexDirection = CineraProps.FlexDirection;
                cinera.style.justifyContent = CineraProps.JustifyContent;
                window.scroll(
                    {
                        top: CineraProps.ScrollY,
                        left: CineraProps.ScrollX
                    }
                );

                viewItems[0].setAttribute("data-id", "theatre");
                viewItems[0].setAttribute("title", "Theatre mode");
                viewItems[0].firstChild.nodeValue = "🎭";
            } CineraProps.V = views.REGULAR; localStorage.removeItem(cineraViewStorageItem); break;
    }
    player.updateSize();
}

function toggleSuperTheatreMode()
{
    switch(CineraProps.V)
    {
        case views.REGULAR:
            {
                toggleTheatreMode();
            }
        case views.THEATRE:
            {
                enterFullScreen_();
            } CineraProps.V = views.SUPERTHEATRE; localStorage.setItem(cineraViewStorageItem, views.SUPERTHEATRE); break;
        case views.SUPERTHEATRE:
            {
                leaveFullScreen_();
                toggleTheatreMode();
            } CineraProps.V = views.REGULAR; localStorage.removeItem(cineraViewStorageItem); break;
    }
    player.updateSize();
}

function AscribeTemporaryResponsibility(Element, Milliseconds)
{
    if(!Element.classList.contains("responsible"))
    {
        Element.classList.add("responsible");
    }
    setTimeout(function() { Element.classList.remove("responsible"); }, Milliseconds);
}

function SelectText(inputElement)
{
    inputElement.select();
}

function CopyToClipboard(inputElement)
{
    SelectText(inputElement);
    document.execCommand("copy");
    AscribeTemporaryResponsibility(linkMenu.parentNode, 8000);
}

function handleKey(key) {
    var gotKey = true;
    switch (key) {
        case "q": {
            if(quotesMenu)
            {
                toggleMenuVisibility(quotesMenu)
            }
        } break;
        case "r": {
            if(referencesMenu)
            {
                toggleMenuVisibility(referencesMenu)
            }
        } break;
        case "f": {
            if(filterMenu)
            {
                toggleMenuVisibility(filterMenu)
            }
        } break;
        case "y": {
            if(linkMenu)
            {
                toggleMenuVisibility(linkMenu)
            }
            break;
        }
        case "c": {
            if(creditsMenu)
            {
                toggleMenuVisibility(creditsMenu)
            }
        } break;
        case "t": {
            if(cinera)
            {
                toggleTheatreMode();
            }
        } break;
        case "T": {
            if(cinera)
            {
                toggleSuperTheatreMode();
            }
        } break;

        case "Enter": {
            if(focusedElement)
            {
                if(focusedElement.parentNode.classList.contains("quotes_container"))
                {
                    var time = focusedElement.querySelector(".timecode").getAttribute("data-timestamp");
                    player.setTimeThenPlay(parseInt(time));
                }
                else if(focusedElement.parentNode.classList.contains("references_container"))
                {
                    var time = focusedIdentifier.getAttribute("data-timestamp");
                    player.setTimeThenPlay(parseInt(time));
                }
                else if(focusedElement.parentNode.classList.contains("credit"))
                {
                    if(focusedElement.hasAttribute)
                    {
                        var url = focusedElement.getAttribute("href");
                        window.open(url, "_blank");
                    }
                }
            }
            else
            {
                console.log("TODO(matt): Implement me, perhaps?\n");
            }
        } break;

        case "o": {
            if(focusedElement)
            {
                if(focusedElement.parentNode.classList.contains("references_container") ||
                    focusedElement.parentNode.classList.contains("quotes_container"))
                {
                    if(player) { player.pause(); }
                    var url = focusedElement.getAttribute("href");
                    window.open(url, "_blank");
                }
                else if(focusedElement.parentNode.classList.contains("credit"))
                {
                    if(focusedElement.hasAttribute("href"))
                    {
                        if(player) { player.pause(); }
                        var url = focusedElement.getAttribute("href");
                        window.open(url, "_blank");
                    }
                }
            }
        } break;

        case "w": case "k": case "ArrowUp": {
            if(focusedElement)
            {
                if(focusedElement.parentNode.classList.contains("quotes_container"))
                {
                    if(focusedElement.previousElementSibling)
                    {
                        focusedElement.classList.remove("focused");
                        unfocusSprite(focusedElement);

                        lastFocusedQuote = focusedElement.previousElementSibling;
                        focusedElement = lastFocusedQuote;
                        focusedElement.classList.add("focused");
                        focusSprite(focusedElement);
                    }
                }
                else if(focusedElement.parentNode.classList.contains("references_container"))
                {
                    if(focusedElement.previousElementSibling)
                    {
                        focusedElement.classList.remove("focused");
                        unfocusSprite(focusedElement);
                        focusedIdentifier.classList.remove("focused");
                        unfocusSprite(focusedIdentifier);

                        lastFocusedReference = focusedElement.previousElementSibling;
                        focusedElement = lastFocusedReference;
                        focusedElement.classList.add("focused");
                        focusSprite(focusedElement);

                        lastFocusedIdentifier = focusedElement.querySelector(".ref_indices").firstElementChild;
                        focusedIdentifier = lastFocusedIdentifier;
                        focusedIdentifier.classList.add("focused");
                        focusSprite(focusedIdentifier);
                    }
                }
                else if(focusedElement.parentNode.parentNode.classList.contains("filters"))
                {
                    if(focusedElement.previousElementSibling &&
                        focusedElement.previousElementSibling.classList.contains("filter_content"))
                    {
                        focusedElement.classList.remove("focused");
                        unfocusSprite(focusedElement);

                        lastFocusedCategory = focusedElement.previousElementSibling;
                        focusedElement = lastFocusedCategory;
                        focusedElement.classList.add("focused");
                        focusSprite(focusedElement);
                    }
                }
                else if(focusedElement.parentNode.classList.contains("credit"))
                {
                    if(focusedElement.parentNode.previousElementSibling)
                    {
                        focusedElement.classList.remove("focused");
                        unfocusSprite(focusedElement);
                        if(focusedElement.parentNode.previousElementSibling.querySelector(".support") &&
                            focusedElement.classList.contains("support"))
                        {
                            setSpriteLightness(focusedElement.firstChild);
                            lastFocusedCreditItem = focusedElement.parentNode.previousElementSibling.querySelector(".support");
                            focusedElement = lastFocusedCreditItem;
                            focusedElement.classList.add("focused");
                            focusSprite(focusedElement);
                        }
                        else
                        {
                            lastFocusedCreditItem = focusedElement.parentNode.previousElementSibling.querySelector(".person");
                            focusedElement = lastFocusedCreditItem;
                            focusedElement.classList.add("focused");
                            focusSprite(focusedElement);
                        }
                    }
                }
            }
        } break;

        case "s": case "j": case "ArrowDown": {
            if(focusedElement)
            {
                if(focusedElement.parentNode.classList.contains("quotes_container"))
                {
                    if(focusedElement.nextElementSibling)
                    {
                        focusedElement.classList.remove("focused");
                        unfocusSprite(focusedElement);

                        lastFocusedQuote = focusedElement.nextElementSibling;
                        focusedElement = lastFocusedQuote;
                        focusedElement.classList.add("focused");
                        focusSprite(focusedElement);
                    }
                }
                else if(focusedElement.parentNode.classList.contains("references_container"))
                {
                    if(focusedElement.nextElementSibling)
                    {
                        focusedElement.classList.remove("focused");
                        unfocusSprite(focusedElement);
                        focusedIdentifier.classList.remove("focused");
                        unfocusSprite(focusedIdentifier);

                        lastFocusedReference = focusedElement.nextElementSibling;
                        focusedElement = lastFocusedReference;
                        focusedElement.classList.add("focused");
                        focusSprite(focusedElement);

                        lastFocusedIdentifier = focusedElement.querySelector(".ref_indices").firstElementChild;
                        focusedIdentifier = lastFocusedIdentifier;
                        focusedIdentifier.classList.add("focused");
                        focusSprite(focusedIdentifier);
                    }
                }
                else if(focusedElement.parentNode.parentNode.classList.contains("filters"))
                {
                    if(focusedElement.nextElementSibling &&
                        focusedElement.nextElementSibling.classList.contains("filter_content"))
                    {
                        focusedElement.classList.remove("focused");
                        unfocusSprite(focusedElement);

                        lastFocusedCategory = focusedElement.nextElementSibling;
                        focusedElement = lastFocusedCategory;
                        focusedElement.classList.add("focused");
                        focusSprite(focusedElement);
                    }
                }
                else if(focusedElement.parentNode.classList.contains("credit"))
                {
                    if(focusedElement.parentNode.nextElementSibling)
                    {
                        focusedElement.classList.remove("focused");
                        unfocusSprite(focusedElement);
                        if(focusedElement.parentNode.nextElementSibling.querySelector(".support") &&
                            focusedElement.classList.contains("support"))
                        {
                            setSpriteLightness(focusedElement.firstChild);
                            lastFocusedCreditItem = focusedElement.parentNode.nextElementSibling.querySelector(".support");
                            focusedElement = lastFocusedCreditItem;
                            focusedElement.classList.add("focused");
                            focusSprite(focusedElement);
                        }
                        else
                        {
                            lastFocusedCreditItem = focusedElement.parentNode.nextElementSibling.querySelector(".person");
                            focusedElement = lastFocusedCreditItem;
                            focusedElement.classList.add("focused");
                            focusSprite(focusedElement);
                        }
                    }
                }
            }
        } break;

        case "a": case "h": case "ArrowLeft": {
            if(focusedElement)
            {
                if(focusedElement.parentNode.classList.contains("references_container"))
                {
                    if(focusedIdentifier.previousElementSibling)
                    {
                        focusedIdentifier.classList.remove("focused");
                        unfocusSprite(focusedIdentifier);
                        lastFocusedIdentifier = focusedIdentifier.previousElementSibling;
                        focusedIdentifier = lastFocusedIdentifier;
                        focusedIdentifier.classList.add("focused");
                        focusSprite(focusedIdentifier);
                    }
                    else if(focusedIdentifier.parentNode.previousElementSibling.classList.contains("ref_indices"))
                    {
                        focusedIdentifier.classList.remove("focused");
                        unfocusSprite(focusedIdentifier);
                        lastFocusedIdentifier = focusedIdentifier.parentNode.previousElementSibling.lastElementChild;
                        focusedIdentifier = lastFocusedIdentifier;
                        focusedIdentifier.classList.add("focused");
                        focusSprite(focusedIdentifier);
                    }
                }
                else if(focusedElement.classList.contains("filter_content"))
                {
                    if(focusedElement.parentNode.classList.contains("filter_media") &&
                        focusedElement.parentNode.previousElementSibling)
                    {
                        focusedElement.classList.remove("focused");
                        unfocusSprite(focusedElement);
                        lastFocusedMedium = focusedElement;

                        if(!lastFocusedTopic)
                        {
                            lastFocusedTopic = focusedElement.parentNode.previousElementSibling.children[1];
                        }
                        lastFocusedCategory = lastFocusedTopic;
                        focusedElement = lastFocusedCategory;
                        focusedElement.classList.add("focused");
                        focusSprite(focusedElement);
                    }
                }
                else if(focusedElement.parentNode.classList.contains("credit"))
                {
                    if(focusedElement.classList.contains("support"))
                    {
                        focusedElement.classList.remove("focused");
                        unfocusSprite(focusedElement);

                        lastFocusedCreditItem = focusedElement.previousElementSibling;
                        setSpriteLightness(focusedElement.firstChild);
                        focusedElement = lastFocusedCreditItem;
                        focusedElement.classList.add("focused");
                        focusSprite(focusedElement);
                    }
                }
            }
        } break;

        case "d": case "l": case "ArrowRight": {
            if(focusedElement)
            {
                if(focusedElement.parentNode.classList.contains("references_container"))
                {
                    if(focusedIdentifier.nextElementSibling)
                    {
                        focusedIdentifier.classList.remove("focused");
                        unfocusSprite(focusedIdentifier);

                        lastFocusedIdentifier = focusedIdentifier.nextElementSibling;
                        focusedIdentifier = lastFocusedIdentifier;
                        focusedIdentifier.classList.add("focused");
                        focusSprite(focusedIdentifier);
                    }
                    else if(focusedIdentifier.parentNode.nextElementSibling)
                    {
                        focusedIdentifier.classList.remove("focused");
                        unfocusSprite(focusedIdentifier);
                        lastFocusedIdentifier = focusedIdentifier.parentNode.nextElementSibling.firstElementChild;
                        focusedIdentifier = lastFocusedIdentifier;
                        focusedIdentifier.classList.add("focused");
                        focusSprite(focusedIdentifier);
                    }
                }
                else if(focusedElement.classList.contains("filter_content"))
                {
                    if(focusedElement.parentNode.classList.contains("filter_topics") &&
                        focusedElement.parentNode.nextElementSibling)
                    {
                        focusedElement.classList.remove("focused");
                        unfocusSprite(focusedElement);
                        lastFocusedTopic = focusedElement;

                        if(!lastFocusedMedium)
                        {
                            lastFocusedMedium = focusedElement.parentNode.nextElementSibling.children[1];
                        }
                        lastFocusedCategory = lastFocusedMedium;
                        focusedElement = lastFocusedCategory;
                        focusedElement.classList.add("focused");
                        focusSprite(focusedElement);
                    }
                }
                else if(focusedElement.parentNode.classList.contains("credit"))
                {
                    if(focusedElement.classList.contains("person") &&
                        focusedElement.nextElementSibling)
                    {
                        focusedElement.classList.remove("focused");
                        unfocusSprite(focusedElement);

                        lastFocusedCreditItem = focusedElement.nextElementSibling;
                        focusedElement = lastFocusedCreditItem;
                        focusedElement.classList.add("focused");
                        focusSprite(focusedElement);
                    }
                }
            }
        } break;

        case "x": case " ": {
            if(focusedElement && focusedElement.classList.contains("filter_content"))
            {
                filterItemToggle(focusedElement);
                if(focusedElement.nextElementSibling &&
                    focusedElement.nextElementSibling.classList.contains("filter_content"))
                {
                    focusedElement.classList.remove("focused");
                    unfocusSprite(focusedElement);
                    if(focusedElement.parentNode.classList.contains("filter_topics"))
                    {
                        lastFocusedTopic = focusedElement.nextElementSibling;
                        lastFocusedCategory = lastFocusedTopic;
                    }
                    else
                    {
                        lastFocusedMedium = focusedElement.nextElementSibling;
                        lastFocusedCategory = lastFocusedMedium;
                    }
                    lastFocusedElement = lastFocusedCategory;
                    focusedElement = lastFocusedElement;
                    focusedElement.classList.add("focused");
                    focusSprite(focusedElement);
                }
            }
        } break;

        case "X": case "capitalSpace": {
            if(focusedElement && focusedElement.classList.contains("filter_content"))
            {
                filterItemToggle(focusedElement);
                if(focusedElement.previousElementSibling &&
                    focusedElement.previousElementSibling.classList.contains("filter_content"))
                {
                    focusedElement.classList.remove("focused");
                    unfocusSprite(focusedElement);
                    if(focusedElement.parentNode.classList.contains("filter_topics"))
                    {
                        lastFocusedTopic = focusedElement.previousElementSibling;
                        lastFocusedCategory = lastFocusedTopic;
                    }
                    else
                    {
                        lastFocusedMedium = focusedElement.previousElementSibling;
                        lastFocusedCategory = lastFocusedMedium;
                    }
                    lastFocusedElement = lastFocusedCategory;
                    focusedElement = lastFocusedElement;
                    focusedElement.classList.add("focused");
                    focusSprite(focusedElement);
                }
            }
        } break;

        case "z": {
            toggleFilterOrLinkMode();
        } break;

        case "v": {
            if(focusedElement && focusedElement.classList.contains("filter_content"))
            {
                invertFilter(focusedElement)
            }
        } break;

        case "V": {
            resetFilter();
        } break;

        case "?": {
            if(helpDocumentation)
            {
                helpDocumentation.classList.toggle("visible");
            }
        } break;

        case 'N':
        case 'J':
        case 'S': {
            player.jumpToNextMarker();
        } break;

        case 'P':
        case 'K':
        case 'W': {
            player.jumpToPrevMarker();
        } break;
        case '[':
        case '<': {
            if(prevEpisode)
            {
                location = prevEpisode.href;
            }
        } break;
        case ']':
        case '>': {
            if(nextEpisode)
            {
                location = nextEpisode.href;
            }
        } break;
        case 'Y': {
            if(cineraLink)
            {
                if(linkTimestamp == false && player.playing)
                {
                    player.pause();
                }
                if(linkMenu && !linkMenu.classList.contains("visible"))
                {
                    toggleMenuVisibility(linkMenu);
                }
                SelectText(cineraLink);
            }
        }
        default: {
            gotKey = false;
        } break;
    }
    return gotKey;
}

function applyFilter() {
    if(filterMode == "exclusive")
    {
        for(var i = 0; i < testMarkers.length; ++i)
        {
            var testCategories = testMarkers[i].classList;
            for(var j = 0; j < testCategories.length; ++j)
            {
                if((testCategories[j].startsWith("off_")) && !testMarkers[i].classList.contains("skip"))
                {
                    testMarkers[i].classList.add("skip");
                }
            }
        }
    }
    else
    {
        for(var i = 0; i < testMarkers.length; ++i)
        {
            var testCategories = testMarkers[i].classList;
            for(var j = 0; j < testCategories.length; ++j)
            {
                if((testCategories[j] in filterState || testCategories[j].startsWith("cat_")) && testMarkers[i].classList.contains("skip"))
                {
                    testMarkers[i].classList.remove("skip");
                }
            }
        }
    }
}

function filterItemToggle(filterItem) {
    var selectedCategory = filterItem.classList[1];
    filterState[selectedCategory].off = !filterState[selectedCategory].off;

    if(filterState[selectedCategory].off)
    {
        filterItem.classList.add("off");
        disableSprite(filterItem);
        if(!filterItem.parentNode.classList.contains("filter_media"))
        {
            filterItem.querySelector(".icon").style.backgroundColor = "transparent";
        }
        var testMarkers = playerContainer.querySelectorAll(".marker." + selectedCategory + ", .marker.cat_" + selectedCategory);
        for(var j = 0; j < testMarkers.length; ++j)
        {
            if(filterState[selectedCategory].type == "topic")
            {
                testMarkers[j].classList.remove("cat_" + selectedCategory);
                testMarkers[j].classList.add("off_" + selectedCategory);
                var markerCategories = testMarkers[j].querySelectorAll(".category." + selectedCategory);
                for(var k = 0; k < markerCategories.length; ++k)
                {
                    if(markerCategories[k].classList.contains(selectedCategory))
                    {
                        markerCategories[k].classList.add("off");
                        markerCategories[k].style.backgroundColor = "transparent";
                    }
                }
            }
            else
            {
                var markerCategories = testMarkers[j].querySelectorAll(".categoryMedium." + selectedCategory);
                for(var k = 0; k < markerCategories.length; ++k)
                {
                    if(markerCategories[k].classList.contains(selectedCategory))
                    {
                        markerCategories[k].classList.add("off");
                        disableSprite(markerCategories[k]);
                    }
                }
                testMarkers[j].classList.remove(selectedCategory);
                testMarkers[j].classList.add("off_" + selectedCategory);
            }

            Skipping = 1;
            if(filterMode == "exclusive")
            {
                testMarkers[j].classList.add("skip");
            }
            else
            {
                var markerClasses = testMarkers[j].classList;
                for(var k = 0; k < markerClasses.length; ++k)
                {
                    if(markerClasses[k] in filterState || markerClasses[k].replace(/^cat_/, "") in filterState)
                    {
                        Skipping = 0;
                    }
                }
                if(Skipping)
                {
                    testMarkers[j].classList.add("skip");
                }
            }

        }
    }
    else
    {
        filterItem.classList.remove("off");
        enableSprite(filterItem);
        if(!filterItem.parentNode.classList.contains("filter_media"))
        {
            filterItem.querySelector(".icon").style.backgroundColor = getComputedStyle(filterItem.querySelector(".icon")).getPropertyValue("border-color");
        }
        setDotLightness(filterItem.querySelector(".icon"));
        var testMarkers = cinera.querySelectorAll(".marker.off_" + selectedCategory);
        for(var j = 0; j < testMarkers.length; ++j)
        {
            if(filterState[selectedCategory].type == "topic")
            {
                testMarkers[j].classList.remove("off_" + selectedCategory);
                testMarkers[j].classList.add("cat_" + selectedCategory);
                var markerCategories = testMarkers[j].querySelectorAll(".category." + selectedCategory);
                for(var k = 0; k < markerCategories.length; ++k)
                {
                    if(markerCategories[k].classList.contains(selectedCategory))
                    {
                        markerCategories[k].classList.remove("off");
                        markerCategories[k].style.backgroundColor = getComputedStyle(markerCategories[k]).getPropertyValue("border-color");
                        setDotLightness(markerCategories[k]);
                    }
                }
            }
            else
            {
                testMarkers[j].classList.remove("off_" + selectedCategory);
                testMarkers[j].classList.add(selectedCategory);
                var markerCategories = testMarkers[j].querySelectorAll(".categoryMedium." + selectedCategory);
                for(var k = 0; k < markerCategories.length; ++k)
                {
                    if(markerCategories[k].classList.contains(selectedCategory))
                    {
                        markerCategories[k].classList.remove("off");
                        enableSprite(markerCategories[k]);
                    }
                }
            }

            Skipping = 0;
            if(filterMode == "inclusive")
            {
                testMarkers[j].classList.remove("skip");
            }
            else
            {
                var markerClasses = testMarkers[j].classList;
                for(var k = 0; k < markerClasses.length; ++k)
                {
                    if(markerClasses[k].startsWith("off_"))
                    {
                        Skipping = 1;
                    }
                }
                if(!Skipping)
                {
                    testMarkers[j].classList.remove("skip");
                }
            }
        }
    }
}

function resetFilter() {
    for(i in filterItems)
    {
        if(filterItems[i].classList)
        {
            var selectedCategory = filterItems[i].classList[1];
            if(filterInitState[selectedCategory].off ^ filterState[selectedCategory].off)
            {
                filterItemToggle(filterItems[i]);
            }
        }
    }

    if(filterMode == "inclusive")
    {
        toggleFilterMode();
    }
}

function invertFilter(focusedElement) {
    var siblings = focusedElement.parentNode.querySelectorAll(".filter_content");
    for(i in siblings)
    {
        if(siblings[i].classList)
        {
            filterItemToggle(siblings[i]);
        }
    }
}

function resetFade() {
    filter.classList.remove("responsible");
    filter.querySelector(".filter_mode").classList.remove("responsible");
    var responsibleCategories = filter.querySelectorAll(".filter_content.responsible");
    for(var i = 0; i < responsibleCategories.length; ++i)
    {
        responsibleCategories[i].classList.remove("responsible");
    }
}

function onRefChanged(ref, element, player) {
    if(element.classList.contains("skip"))
    {
        var ErrorCount = 0;
        if(!filter) { console.log("Missing filter_container div"); ErrorCount++; }
        if(!filterState) { console.log("Missing filterState object"); ErrorCount++; }
        if(ErrorCount > 0)
        {
            switch(ErrorCount)
            {
                case 1:
                    { console.log("This should have been generated by Cinera along with the following element containing the \"skip\" class:"); } break;
                default:
                    { console.log("These should have been generated by Cinera along with the following element containing the \"skip\" class:"); } break;
            }
            console.log(element); return;
        }

        if(!filter.classList.contains("responsible"))
        {
            filter.classList.add("responsible");
        }

        for(var selector = 0; selector < element.classList.length; ++selector)
        {
            if(element.classList[selector].startsWith("off_"))
            {
                if(!filter.querySelector(".filter_content." + element.classList[selector].replace(/^off_/, "")).classList.contains("responsible"))
                {
                    filter.querySelector(".filter_content." + element.classList[selector].replace(/^off_/, "")).classList.add("responsible");
                }
            }
            if(element.classList[selector].startsWith("cat_") || element.classList[selector] in filterState)
            {
                if(!filter.querySelector(".filter_mode").classList.add("responsible"))
                {
                    filter.querySelector(".filter_mode").classList.add("responsible");
                }
            }
            setTimeout(resetFade, 8000);
        }
        if(player && player.playing)
        {
            player.jumpToNextMarker();
        }
    }
    else
    {
        for (var MenuIndex = 0; MenuIndex < sourceMenus.length; ++MenuIndex)
        {
            var SetMenu = 0;
            if (ref !== undefined && ref !== null) {
                var refElements = sourceMenus[MenuIndex].querySelectorAll(".refs .ref");
                var refs = ref.split(",");

                for (var i = 0; i < refElements.length; ++i) {
                    if (refs.includes(refElements[i].getAttribute("data-id"))) {
                        refElements[i].classList.add("current");
                        SetMenu = 1;
                    } else {
                        refElements[i].classList.remove("current");
                    }
                }
                if(SetMenu) {
                    sourceMenus[MenuIndex].classList.add("current");
                } else {
                    sourceMenus[MenuIndex].classList.remove("current");
                }

            } else {
                sourceMenus[MenuIndex].classList.remove("current");
                var refs = sourceMenus[MenuIndex].querySelectorAll(".refs .ref");
                for (var i = 0; i < refs.length; ++i) {
                    refs[i].classList.remove("current");
                }
            }
        }
    }
}

function navigateFilter(filterItem) {
    if(filterItem != lastFocusedCategory)
    {
        lastFocusedCategory.classList.remove("focused");
        unfocusSprite(lastFocusedCategory);
        if(filterItem.parentNode.classList.contains("filter_topics"))
        {
            lastFocusedTopic = filterItem;
            lastFocusedCategory = lastFocusedTopic;
        }
        else
        {
            lastFocusedMedium = filterItem;
            lastFocusedCategory = lastFocusedMedium;
        }
        focusedElement = lastFocusedCategory;
        focusedElement.classList.add("focused");
        focusSprite(focusedElement);
    }
}

function mouseOverQuotes(quote) {
    if(focusedElement && quote != lastFocusedQuote)
    {
        focusedElement.classList.remove("focused");
        lastFocusedQuote = quote;
        focusedElement = lastFocusedQuote;
        focusedElement.classList.add("focused");
    }
}

function mouseOverReferences(reference) {
    if(focusedElement && reference != lastFocusedReference)
    {
        focusedElement.classList.remove("focused")
        lastFocusedReference = reference;
    }
    focusedElement = lastFocusedReference;
    focusedElement.classList.add("focused");

    var ourIdentifiers = reference.querySelectorAll(".timecode");
    weWereLastFocused = false;
    for(var k = 0; k < ourIdentifiers.length; ++k)
    {
        if(ourIdentifiers[k] == lastFocusedIdentifier)
        {
            weWereLastFocused = true;
        }
    }
    if(!weWereLastFocused)
    {
        lastFocusedIdentifier.classList.remove("focused");
        lastFocusedIdentifier = ourIdentifiers[0];
    }
    focusedIdentifer = lastFocusedIdentifier;
    focusedIdentifer.classList.add("focused");

    for(var l = 0; l < ourIdentifiers.length; ++l)
    {
        ourIdentifiers[l].addEventListener("mouseenter", function(ev) {
            if(this != lastFocusedIdentifier)
            {
                lastFocusedIdentifier.classList.remove("focused");
                lastFocusedIdentifier = this;
                lastFocusedIdentifier.classList.add("focused");
            }
        })
    }
}

function mouseSkipToTimecode(player, time, ev)
{
    player.setTimeThenPlay(parseInt(time, 10));
    ev.preventDefault();
    ev.stopPropagation();
    return false;
}

function handleMenuTogglerInteraction(menu, eventType)
{
    if(!(menu.classList.contains("visible")) && eventType == "mouseenter" ||
        menu.classList.contains("visible") && eventType == "mouseleave" ||
        (eventType == "click" && !menu.classList.contains("cineraHelp")))
    {
        if(menu.classList.contains("quotes"))
        {
            toggleMenuVisibility(quotesMenu);
        }
        else if(menu.classList.contains("references"))
        {
            toggleMenuVisibility(referencesMenu);
        }
        else if(menu.classList.contains("filter"))
        {
            toggleMenuVisibility(filterMenu);
        }
        else if(menu.classList.contains("link"))
        {
            toggleMenuVisibility(linkMenu);
        }
        else if(menu.classList.contains("credits"))
        {
            toggleMenuVisibility(creditsMenu);
        }
    }
}