<!doctype html>
<html>
<head>
    <title>MediaRecorder Dataavailable</title>
    <link rel="help" href="https://w3c.github.io/mediacapture-record/MediaRecorder.html#mediarecorder">
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
    <script src="../common/canvas-tests.js"></script>
</head>
<body>
<div>
    <video id="player">
    </video>
</div>
<div>
    <canvas id="canvas" width="200" height="200">
    </canvas>
    <canvas id="frame" width="200" height="200">
    </canvas>
</div>
<script>
    var context;
    var drawStartTime;

    function createVideoStream() {
        const canvas = document.getElementById("canvas");
        context = canvas.getContext('2d');
        return canvas.captureStream();
    }

    function doRedImageDraw() {
        if (context) {
            context.fillStyle = "#ff0000";
            context.fillRect(0, 0, 200, 200);
            if (Date.now() - drawStartTime < 500) {
                window.requestAnimationFrame(doRedImageDraw);
            } else {
                drawStartTime = Date.now();
                doGreenImageDraw();
            }
        }
    }

    function doGreenImageDraw() {
        if (context) {
            context.fillStyle = "#00ff00";
            context.fillRect(0, 0, 200, 200);
            if (Date.now() - drawStartTime < 2000) {
                window.requestAnimationFrame(doGreenImageDraw);
            }
        }
    }

    async_test(t => {
        const ac = new AudioContext();
        const osc = ac.createOscillator();
        const dest = ac.createMediaStreamDestination();
        const audio = dest.stream;
        osc.connect(dest);

        const video = createVideoStream();
        assert_equals(video.getAudioTracks().length, 0, "video mediastream starts with no audio track");
        assert_equals(audio.getAudioTracks().length, 1, "audio mediastream starts with one audio track");
        video.addTrack(audio.getAudioTracks()[0]);
        assert_equals(video.getAudioTracks().length, 1, "video mediastream starts with one audio track");
        const recorder = new MediaRecorder(video);
        let mode = 0;

        recorder.ondataavailable = t.step_func(blobEvent => {
            assert_true(blobEvent instanceof BlobEvent, 'the type of event should be BlobEvent');
            assert_equals(blobEvent.type, 'dataavailable', 'the event type should be dataavailable');
            assert_true(blobEvent.isTrusted, 'isTrusted should be true when the event is created by C++');
            assert_true(blobEvent.data instanceof Blob, 'the type of data should be Blob');
            assert_true(blobEvent.data.size > 0, 'the blob should contain some buffers');
            player.src = window.URL.createObjectURL(blobEvent.data);
            const resFrame = document.getElementById("frame");
            const resContext = resFrame.getContext('2d');

            player.oncanplay = t.step_func(() => {
                assert_greater_than(player.duration, 0.1, 'the duration should be greater than 100ms');
                player.play();
            });
            player.onplay = () => {
                player.pause();
                player.currentTime = 0.05;
            };
            player.onseeked = t.step_func(() => {
                resContext.drawImage(player, 0, 0);
                if (!mode) {
                    _assertPixelApprox(resFrame, 25, 25, 255, 0, 0, 255, "25, 25", "255, 0, 0, 255", 50);
                    _assertPixelApprox(resFrame, 50, 50, 255, 0, 0, 255, "50, 50", "255, 0, 0, 255", 50);
                    mode = 1;
                    player.currentTime = Math.min(1.5, player.duration - 0.05);
                } else {
                    _assertPixelApprox(resFrame, 20, 20, 0, 255, 0, 255, "20, 20", "0, 255, 0, 255", 50);
                    _assertPixelApprox(resFrame, 199, 199, 0, 255, 0, 255, "199, 199", "0, 255, 0, 255", 50);
                    t.done();
                }
            });
            player.load();
        });
        drawStartTime = Date.now();
        doRedImageDraw();
        recorder.start();
        assert_equals(recorder.state, 'recording', 'MediaRecorder has been started successfully');
        setTimeout(() => {
            recorder.stop();
        }, 2000);
    }, 'MediaRecorder can successfully record the video for a audio-video stream');

</script>
</body>
</html>