<!doctype html>
<html>
    <head>
        <meta charset="utf-8">
        <script src="/resources/testharness.js"></script>
        <script src="/resources/testharnessreport.js"></script>
    </head>
    <body>
        <video id="video1" autoplay></video>
        <video id="video2" autoplay></video>
        <script src ="routines.js"></script>
        <script>
async function waitForMessage(worker, data)
{
    while (true) {
        const received = await new Promise(resolve => worker.onmessage = (event) => resolve(event.data));
        if (data === received)
            return;
    }
}

promise_test(async (test) => {
    worker = new Worker('script-write-twice-transform-worker.js');
    const data = await new Promise(resolve => worker.onmessage = (event) => resolve(event.data));
    assert_equals(data, "registered");

    const localStream = await navigator.mediaDevices.getUserMedia({video: true});

    let sender, receiver;
    const senderTransform = new RTCRtpScriptTransform(worker, {name:'MockRTCRtpTransform', side:'sender', role:'encrypt'});
    const receiverTransform = new RTCRtpScriptTransform(worker, {name:'MockRTCRtpTransform', side:'receiver', role:'decrypt'});

    const startedPromise = new Promise(resolve => worker.onmessage = (event) => resolve(event.data));

    const stream = await new Promise((resolve, reject) => {
        createConnections(test, (firstConnection) => {
            pc1 = firstConnection;
            sender = firstConnection.addTrack(localStream.getVideoTracks()[0], localStream);
            sender.transform = senderTransform;
        }, (secondConnection) => {
            pc2 = secondConnection;
            secondConnection.ontrack = (trackEvent) => {
                receiver = trackEvent.receiver;
                receiver.transform = receiverTransform;
                resolve(trackEvent.streams[0]);
            };
        });
        test.step_timeout(() => reject("Test timed out"), 5000);
    });

    assert_equals(await startedPromise, "started");

    video1.srcObject = stream;
    await video1.play();
}, "video exchange with write twice transform");
        </script>
    </body>
</html>