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<title>RTCRtpSender.prototype.setStreams</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="RTCPeerConnection-helper.js"></script>
<script>
'use strict';

promise_test(async t => {
  const caller = new RTCPeerConnection();
  t.add_cleanup(() => caller.close());
  const callee = new RTCPeerConnection();
  t.add_cleanup(() => callee.close());
  const stream = await getNoiseStream({audio: true});
  t.add_cleanup(() => stream.getTracks().forEach(track => track.stop()));
  const [track] = stream.getTracks();

  const sender = caller.addTrack(track);
  const stream1 = new MediaStream();
  const stream2 = new MediaStream();
  sender.setStreams(stream1, stream2);

  const offer = await caller.createOffer();
  callee.setRemoteDescription(offer);
  return new Promise(resolve => callee.ontrack = t.step_func(event =>{
    assert_equals(event.streams.length, 2);
    const calleeStreamIds = event.streams.map(s => s.id);
    assert_in_array(stream1.id, calleeStreamIds);
    assert_in_array(stream2.id, calleeStreamIds);
    resolve();
  }));
}, 'setStreams causes streams to be reported via ontrack on callee');

promise_test(async t => {
  const caller = new RTCPeerConnection();
  t.add_cleanup(() => caller.close());
  const callee = new RTCPeerConnection();
  t.add_cleanup(() => callee.close());
  const stream = await getNoiseStream({audio: true});
  t.add_cleanup(() => stream.getTracks().forEach(track => track.stop()));
  const [track] = stream.getTracks();

  const sender = caller.addTrack(track);
  sender.setStreams(stream);

  const offer = await caller.createOffer();
  callee.setRemoteDescription(offer);
  return new Promise(resolve => callee.ontrack = t.step_func(event =>{
    assert_equals(event.streams.length, 1);
    assert_equals(stream.id, event.streams[0].id);
    assert_equals(track.id, event.track.id);
    assert_equals(event.streams[0].getTracks()[0], event.track);
    resolve();
  }));
}, 'setStreams can be used to reconstruct a stream with a track on the remote side');


promise_test(async t => {
  const caller = new RTCPeerConnection();
  t.add_cleanup(() => caller.close());
  const callee = new RTCPeerConnection();
  t.add_cleanup(() => callee.close());

  callee.ontrack = t.unreached_func();
  const transceiver = caller.addTransceiver('audio', {direction: 'inactive'});
  await exchangeOfferAnswer(caller, callee);

  const stream1 = new MediaStream();
  const stream2 = new MediaStream();
  transceiver.direction = 'sendrecv';
  transceiver.sender.setStreams(stream1, stream2);

  const offer = await caller.createOffer();
  callee.setRemoteDescription(offer);
  return new Promise(resolve => callee.ontrack = t.step_func(event =>{
    assert_equals(event.streams.length, 2);
    const calleeStreamIds = event.streams.map(s => s.id);
    assert_in_array(stream1.id, calleeStreamIds);
    assert_in_array(stream2.id, calleeStreamIds);
    assert_in_array(event.track, event.streams[0].getTracks());
    assert_in_array(event.track, event.streams[1].getTracks());
    resolve();
  }));
}, 'Adding streams and changing direction causes new streams to be reported via ontrack on callee');

promise_test(async t => {
  const caller = new RTCPeerConnection();
  t.add_cleanup(() => caller.close());
  const callee = new RTCPeerConnection();
  t.add_cleanup(() => callee.close());

  const stream1 = new MediaStream();
  const stream2 = new MediaStream();
  let calleeTrack = null;
  callee.ontrack = t.step_func(event => {
    assert_equals(event.streams.length, 0);
    calleeTrack = event.track;
  });
  const transceiver = caller.addTransceiver('audio', {direction: 'sendrecv'});
  await exchangeOfferAnswer(caller, callee);
  assert_true(calleeTrack instanceof MediaStreamTrack);

  transceiver.sender.setStreams(stream1, stream2);
  const offer = await caller.createOffer();
  callee.setRemoteDescription(offer);
  return new Promise(resolve => callee.ontrack = t.step_func(event =>{
    assert_equals(event.streams.length, 2);
    const calleeStreamIds = event.streams.map(s => s.id);
    assert_in_array(stream1.id, calleeStreamIds);
    assert_in_array(stream2.id, calleeStreamIds);
    assert_in_array(event.track, event.streams[0].getTracks());
    assert_in_array(event.track, event.streams[1].getTracks());
    assert_equals(event.track, calleeTrack);
    resolve();
  }));
}, 'Adding streams to an active transceiver causes new streams to be reported via ontrack on callee');

test(t => {
  const pc = new RTCPeerConnection();
  const stream1 = new MediaStream();
  const stream2 = new MediaStream();
  const transceiver = pc.addTransceiver('audio');

  pc.close();
  assert_throws_dom('InvalidStateError', () => transceiver.sender.setStreams(stream1, stream2));
}, 'setStreams() fires InvalidStateError on a closed peer connection.');
</script>