<!doctype html>
<html>
<head>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
</head>
<body>
<div>
    <video id="low" playsinline autoplay width="320"></video>
    <video id="mid" playsinline autoplay width="320"></video>
    <video id="high" playsinline autoplay width="320"></video>
</div>
<script>
if (window.testRunner)
    testRunner.setWebRTCUnifiedPlanEnabled(false);
var state;
var finished = false;
// This test is largely inspired from Chrome/Firefox/Simulcast playground tests.
promise_test(async (test) => {
    if (window.testRunner && testRunner.timeout) {
        setTimeout(() => {
            if (!finished)
                throw "test stucked in state: " + state;
        }, testRunner.timeout * 0.9);
    }

    state = "start";

    const pc1 = new RTCPeerConnection();
    const pc2 = new RTCPeerConnection();
    pc1.onicecandidate = (e) => pc2.addIceCandidate(e.candidate);
    pc2.onicecandidate = (e) => pc1.addIceCandidate(e.candidate);

    let counter = 0;
    pc2.ontrack = (e) => {
        if (counter == 0)
            low.srcObject = new MediaStream([e.track]);
        else if (counter == 1)
            mid.srcObject = new MediaStream([e.track]);
        else
            high.srcObject = new MediaStream([e.track]);
        ++counter;
    }

    const localStream = await navigator.mediaDevices.getUserMedia({ video: { width: 640, height: 480 } });
    pc1.addTrack(localStream.getVideoTracks()[0], localStream);
    const offer = await pc1.createOffer();

    state = "got offer";

    match = offer.sdp.match(/a=ssrc:(\d+) cname:(.*)\r\n/);
    msid = offer.sdp.match(/a=ssrc:(\d+) msid:(.*)\r\n/);
    var lines = offer.sdp.trim().split('\r\n');
    var removed = lines.splice(lines.length - 4, 4);
    var videoSSRC1 = parseInt(match[1]);
    rtxSSRC1 = offer.sdp.split('\r\n').filter((line) => { return line.startsWith('a=ssrc-group:FID ')})[0].split(' ')[2];
    var videoSSRC2 = videoSSRC1 + 1;
    var rtxSSRC2 = videoSSRC1 + 2;
    var videoSSRC3 = videoSSRC1 + 3;
    var rtxSSRC3 = videoSSRC1 + 4;
    lines.push(removed[0]);
    lines.push(removed[1]);
    lines.push('a=ssrc:' + videoSSRC2 + ' cname:' + match[2]);
    lines.push('a=ssrc:' + videoSSRC2 + ' msid:' + msid[2]);
    lines.push('a=ssrc:' + rtxSSRC2 + ' cname:' + match[2]);
    lines.push('a=ssrc:' + rtxSSRC2 + ' msid:' + msid[2]);

    lines.push('a=ssrc:' + videoSSRC3 + ' cname:' + match[2]);
    lines.push('a=ssrc:' + videoSSRC3 + ' msid:' + msid[2]);
    lines.push('a=ssrc:' + rtxSSRC3 + ' cname:' + match[2]);
    lines.push('a=ssrc:' + rtxSSRC3 + ' msid:' + msid[2]);

    lines.push('a=ssrc-group:FID ' + videoSSRC2 + ' ' + rtxSSRC2);
    lines.push('a=ssrc-group:FID ' + videoSSRC3 + ' ' + rtxSSRC3);
    lines.push('a=ssrc-group:SIM ' + videoSSRC1 + ' ' + videoSSRC2 + ' ' + videoSSRC3);
    offer.sdp = lines.join('\r\n') + '\r\n';

    var offer2 = {
        type: 'offer',
        sdp: offer.sdp,
    };
    offer2.sdp = offer2.sdp.replace('a=ssrc-group:SIM ' + videoSSRC1 + ' ' + videoSSRC2 + ' ' + videoSSRC3 + '\r\n', '');

    offer2.sdp = offer2.sdp.replace('a=ssrc:' + videoSSRC1 + ' msid:' + msid[2], 'a=ssrc:' + videoSSRC1 + ' msid:low low');
    offer2.sdp = offer2.sdp.replace('a=ssrc:' + rtxSSRC1 + ' msid:' + msid[2], 'a=ssrc:' + rtxSSRC1 + ' msid:low low');

    offer2.sdp = offer2.sdp.replace('a=ssrc:' + videoSSRC2 + ' msid:' + msid[2], 'a=ssrc:' + videoSSRC2 + ' msid:mid mid');
    offer2.sdp = offer2.sdp.replace('a=ssrc:' + rtxSSRC2 + ' msid:' + msid[2], 'a=ssrc:' + rtxSSRC2 + ' msid:mid mid');

    offer2.sdp = offer2.sdp.replace('a=ssrc:' + videoSSRC3 + ' msid:' + msid[2], 'a=ssrc:' + videoSSRC3 + ' msid:hi hi');
    offer2.sdp = offer2.sdp.replace('a=ssrc:' + rtxSSRC3 + ' msid:' + msid[2], 'a=ssrc:' + rtxSSRC3 + ' msid:hi hi');
    await Promise.all([
        pc1.setLocalDescription(offer),
        pc2.setRemoteDescription(offer2),
    ]);

    state = "set description";

    const answer = await pc2.createAnswer();

    state = "got answer";

    await Promise.all([
        pc2.setLocalDescription(answer),
        pc1.setRemoteDescription(answer),
    ]);

    state = "set description 2";

    await low.play();
    state = "video low plays";

    assert_equals(low.srcObject.getVideoTracks()[0].getSettings().height, 240);
    assert_equals(low.srcObject.getVideoTracks()[0].getSettings().width, 320);

    await mid.play();
    state = "video mid plays";

    assert_equals(mid.srcObject.getVideoTracks()[0].getSettings().height, 480);
    assert_equals(mid.srcObject.getVideoTracks()[0].getSettings().width, 640);

    finished = true;
}, "Testing simulcast");
</script>
</body>
</html>