<!DOCTYPE html>
<script src="../../../resources/js-test-pre.js"></script>
<body>
<video src="../../content/CC+Subtitles.mov" style="position: absolute; left: 0; top: 0; width: 640px; height: 360px;" controls autoplay></video>
<script type="text/javascript">

window.jsTestIsAsync = true;

description("Clicking on a track in the tracks panel.");

const media = document.querySelector("video");
const shadowRoot = window.internals.shadowRoot(media);

let previouslySelectedTrack = 0;

media.addEventListener("play", () => {
    media.pause();

    dumpAudioTracksEnabledState();

    media.audioTracks.addEventListener("change", audioTracksDidChange);

    debug("");
    shouldBecomeDifferent("shadowRoot.querySelector('button.tracks')", "null", () => {
        shouldBecomeDifferent("shadowRoot.querySelector('button.tracks').getBoundingClientRect().width", "0", () => {
            clickOnTracksButton(clickOnSecondAudioTrack);
        });
    });
});

function clickOnTracksButton(continuation)
{
    window.requestAnimationFrame(() => {
        debug("");
        debug("Clicking on the tracks button");
        clickOnElement(shadowRoot.lastChild.querySelector("button.tracks"));
        window.requestAnimationFrame(continuation);
    });
}

function clickOnSecondAudioTrack()
{
    debug("Clicking on second audio track in tracks panel");
    clickOnAudioTrackAtIndex(1);
}

function clickOnThirdAudioTrack()
{
    debug("Clicking on third audio track in tracks panel");
    clickOnAudioTrackAtIndex(2);
}

function clickOnAudioTrackAtIndex(index)
{
    clickOnElement(shadowRoot.lastChild.querySelectorAll("li")[index]);
}

function clickOnElement(element)
{
    const bounds = element.getBoundingClientRect();
    eventSender.mouseMoveTo(bounds.left + 1, bounds.top + 1);
    eventSender.mouseDown();
    eventSender.mouseUp();
}

function audioTracksDidChange()
{
    const newSelectedTrack = Array.from(media.audioTracks).findIndex(track => track.enabled);
    if (previouslySelectedTrack === newSelectedTrack)
        return;

    previouslySelectedTrack = newSelectedTrack;

    debug("");
    debug("Obtained change event on media audio tracks");

    dumpAudioTracksEnabledState();

    if (media.audioTracks[1].enabled)
        shadowRoot.querySelector(".tracks-panel").addEventListener("transitionend", event => clickOnTracksButton(clickOnThirdAudioTrack));
    else if (media.audioTracks[2].enabled) {
        debug("");
        media.remove();
        finishJSTest();
    }
}

function dumpAudioTracksEnabledState()
{
    Array.from(media.audioTracks).forEach((audioTrack, index) => {
        debug(`media.audioTracks[${index}].enabled = ${media.audioTracks[index].enabled}`);
    });
}

</script>
<script src="../../../resources/js-test-post.js"></script>
</body>