inbandTrack1 = null;

function testTrackListContainsTrack(listStr, trackStr)
{
    var list = eval(listStr);
    var track = eval(trackStr);
    var found = false;
    for (var i = 0; i < list.length; ++i) {
        if (list[i] == track) {
            found = true;
            break;
        }
    }
    reportExpected(found, listStr, " contains ", trackStr, list);
}

function compareTracks(track1, track2)
{
    var equal = (eval(track1) == eval(track2));
    reportExpected(equal, track1, "==", track2, track1);
}

function testAddTrack(uri, type)
{
    var addtrackEventCount = 0;

    function trackAdded(event)
    {
        consoleWrite("EVENT(" + event.type + ")");
        ++addtrackEventCount;

        /* Don't make assumptions about the order of track events. If you know
         * the expected order, it should be tested separately. */
        testTrackListContainsTrack("video." + type + "Tracks", "event.track");
        consoleWrite("");
    }

    findMediaElement();
    var tracks = eval("video." + type + "Tracks");
    tracks.addEventListener("addtrack", trackAdded);
    video.src = uri;
    waitForEventAndEnd('canplaythrough');
}

function testAttribute(uri, type, attribute, values)
{
    function canplaythrough()
    {
        consoleWrite("<br><i>** Check in-band kind attributes</i>");

        if (values instanceof Array) {
            testExpected(`video.${type}Tracks.length`, values.length);
            for (let i = 0; i < values.length; ++i)
                testExpected(`video.${type}Tracks[${i}].${attribute}`, values[i]);
        } else {
            testExpected(`video.${type}Tracks.length`, Object.keys(values).length);
            for (let id in values)
                testExpected(`video.${type}Tracks.getTrackById('${id}').${attribute}`, values[id]);
        }

        consoleWrite("");
        endTest();
    }

    findMediaElement();
    video.src = uri;
    waitForEvent('canplaythrough', canplaythrough);
}

function testCuesAddedOnce(uri, kind)
{

    var seekedCount = 0;
    var cuesStarts = [];
    var intervalId = null;
    inbandTrack1 = null;

    function pollProgress()
    {
        if (video.currentTime < 2)
            return;

        if (!inbandTrack1) {
            failTest("No text track of kind '" + kind + "'");
            clearInterval(intervalId);
            return;
        }
        if (!inbandTrack1.cues) {
            failTest("No text track of kind '" + kind + "'");
            clearInterval(intervalId);
            return;
        }

        testExpected("inbandTrack1.cues.length", 0, ">");

        if (!seekedCount) {
            // Collect the start times of all cues, seek back to the\beginning and play
            // the same segment of the video file.
            run("video.pause()");
            for (var i = 0; i < inbandTrack1.cues.length; ++i)
                cuesStarts.push(inbandTrack1.cues[i].startTime);
            run("video.currentTime = 0");
            run("video.play()");
            consoleWrite("");
            return;
        }

        run("video.pause()");
        try {
            var success = true;
            for (var i = 0; i < cuesStarts.length; ++i) {
                if (inbandTrack1.cues[i].startTime != cuesStarts[i]) {
                    // Since we don't know the exact number of cues, only print
                    // output if the test fails.
                    testExpected("inbandTrack1.cues[" + i + "].startTime", cuesStarts[i]);
                    success = false;
                }
            }
            clearInterval(intervalId);
            logResult(success, "Test all cues are equal");
            endTest();
        } catch (e) {
            clearInterval(intervalId);
            failTest(e);
        }
    }

    function canplaythrough()
    {
        waitForEvent('seeked', function() { ++seekedCount; });
        intervalId = setInterval(pollProgress, 100);

        consoleWrite("<br><i>** Setting track 1 to showing</i>");
        inbandTrack1 = null;
        for (var i = 0; i < video.textTracks.length; ++i) {
            if (video.textTracks[i].kind == kind) {
                inbandTrack1 = video.textTracks[i];
                break;
            }
        }
        if (!inbandTrack1)
            failTest("No text track of kind '" + kind + "'");
        run("inbandTrack1.mode = 'showing'");
        run("video.play()");
    }

    findMediaElement();
    video.src = uri;
    waitForEvent('canplaythrough', canplaythrough);
}

function testTextTrackOrder(uri, numInBandTracks)
{
    function compareTracks(track1, track2)
    {
        var equal = (eval(track1) == eval(track2));
        reportExpected(equal, track1, "==", track2, track1);
    }

    function canplaythrough()
    {
        consoleWrite("<br><i>** Check initial in-band track states</i>");
        testExpected("video.textTracks.length", numInBandTracks);
        for (var i = 0; i < numInBandTracks; ++i)
          run("inbandTrack" + (i + 1) + " = video.textTracks[" + i + "]");

        consoleWrite("<br><i>** Add two tracks, check sort order<" + "/i>");
        run("addTrack = video.addTextTrack('captions', 'Caption Track', 'en')");
        run("trackElement = document.createElement('track')");
        trackElement.label = '<track>';
        run("video.appendChild(trackElement)");
        testExpected("video.textTracks.length", numInBandTracks + 2);

        compareTracks("video.textTracks[0]", "trackElement.track");
        compareTracks("video.textTracks[1]", "addTrack");
        for (var i = 1; i < numInBandTracks + 1; ++i)
          compareTracks("video.textTracks[" + (i + 1) + "]", "inbandTrack" + i);

        consoleWrite("<br><i>** Unload video file, check track count<" + "/i>");
        run("video.src = ''");
        testExpected("video.textTracks.length", 2);

        consoleWrite("");
        endTest();
    }

    findMediaElement();
    video.src = uri;
    waitForEvent('canplaythrough', canplaythrough);
}