<!doctype html>
<html>
    <head>
        <meta charset="utf-8">
        <script src="/resources/testharness.js"></script>
        <script src="/resources/testharnessreport.js"></script>
    </head>
    <body>
        <script src="../service-workers/service-worker/resources/test-helpers.sub.js"></script>
        <script>
async function createConnections(test, firstConnectionCallback, secondConnectionCallback)
{
    const pc1 = new RTCPeerConnection();
    const pc2 = new RTCPeerConnection();

    test.add_cleanup(() => pc1.close());
    test.add_cleanup(() => pc2.close());

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

    firstConnectionCallback(pc1);

    const offer = await pc1.createOffer();
    await pc1.setLocalDescription(offer);
    await pc2.setRemoteDescription(offer);

    secondConnectionCallback(pc2);

    const answer = await pc2.createAnswer();
    await pc2.setLocalDescription(answer);
    await pc1.setRemoteDescription(answer);
}

async function waitForMessage(receiver, data)
{
    while (true) {
        const received = await new Promise(resolve => receiver.onmessage = (event) => resolve(event.data));
        if (data === received)
            return;
    }
}

promise_test(async (test) => {
    let frame;
    const scope = 'resources/';
    const script = 'transfer-datachannel-service-worker.js';

    await service_worker_unregister(test, scope);
    const registration = await navigator.serviceWorker.register(script, {scope});
    test.add_cleanup(async () => {
        return service_worker_unregister(test, scope);
    });
    const worker = registration.installing;

    const messageChannel = new MessageChannel();

    let localChannel;
    let remoteChannel;

    await new Promise((resolve, reject) => {
        createConnections(test, (firstConnection) => {
            localChannel = firstConnection.createDataChannel('sendDataChannel');
            worker.postMessage({channel: localChannel, port: messageChannel.port2}, [localChannel, messageChannel.port2]);
        }, (secondConnection) => {
            secondConnection.ondatachannel = (event) => {
                remoteChannel = event.channel;
                remoteChannel.onopen = resolve;
            };
        });
    });

    const promise = waitForMessage(messageChannel.port1, "OK");
    remoteChannel.send("OK");
    await promise;

    const data = new Promise(resolve => remoteChannel.onmessage = (event) => resolve(event.data));
    messageChannel.port1.postMessage({message: "OK2"});
    assert_equals(await data, "OK2");
}, "offerer data channel in service worker");
        </script>
    </body>
</html>
