<!doctype html>
<meta charset=utf-8>
<title>RTCPeerConnection-transceivers.https.html</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="RTCPeerConnection-helper.js"></script>
<script>
'use strict';

// The following helper functions are called from RTCPeerConnection-helper.js:
//   exchangeOffer
//   exchangeOfferAndListenToOntrack
//   exchangeAnswer
//   exchangeAnswerAndListenToOntrack
//   addEventListenerPromise
//   createPeerConnectionWithCleanup
//   createTrackAndStreamWithCleanup
//   findTransceiverForSender

promise_test(async t => {
  const pc1 = createPeerConnectionWithCleanup(t);
  pc1.addTrack(... await createTrackAndStreamWithCleanup(t));
  const pc2 = createPeerConnectionWithCleanup(t);
  exchangeIceCandidates(pc1, pc2);

  const unmuteResolver = new Resolver();
  let remoteTrack = null;
  // The unmuting it timing sensitive so we hook up to the event directly
  // instead of wrapping it in an EventWatcher which uses promises.
  pc2.ontrack = t.step_func(e => {
    remoteTrack = e.track;
    assert_true(remoteTrack.muted, 'track is muted in ontrack');
    remoteTrack.onunmute = t.step_func(e => {
      assert_false(remoteTrack.muted, 'track is unmuted in onunmute');
      unmuteResolver.resolve();
    });
    pc2.ontrack = t.step_func(e => {
      assert_unreached('ontrack fired unexpectedly');
    });
  });
  await exchangeOfferAnswer(pc1, pc2);
  await unmuteResolver;
}, 'ontrack: track goes from muted to unmuted');

promise_test(async t => {
  const pc1 = createPeerConnectionWithCleanup(t);
  const pc1Sender = pc1.addTrack(... await createTrackAndStreamWithCleanup(t));
  const localTransceiver = findTransceiverForSender(pc1, pc1Sender);
  const pc2 = createPeerConnectionWithCleanup(t);
  exchangeIceCandidates(pc1, pc2);

  const e = await exchangeOfferAndListenToOntrack(t, pc1, pc2);
  // Need to wait for the initial unmute event before renegotiating, otherwise
  // there will be no transition from unmuted->muted.
  const muteWatcher = new EventWatcher(t, e.track, ['mute', 'unmute']);
  const unmutePromise = muteWatcher.wait_for('unmute');
  await exchangeAnswer(pc1, pc2);
  await unmutePromise;

  const mutePromise = muteWatcher.wait_for('mute');
  localTransceiver.direction = 'inactive';
  await exchangeOfferAnswer(pc1, pc2);

  await mutePromise;
}, 'Changing transceiver direction to \'inactive\' mutes the remote track');

promise_test(async t => {
  const pc1 = createPeerConnectionWithCleanup(t);
  const pc1Sender = pc1.addTrack(... await createTrackAndStreamWithCleanup(t));
  const localTransceiver = findTransceiverForSender(pc1, pc1Sender);
  const pc2 = createPeerConnectionWithCleanup(t);
  exchangeIceCandidates(pc1, pc2);

  const e = await exchangeOfferAndListenToOntrack(t, pc1, pc2);
  await exchangeAnswer(pc1, pc2);
  localTransceiver.direction = 'inactive';
  await exchangeOfferAnswer(pc1, pc2);

  const unmuteWatcher = new EventWatcher(t, e.track, ['unmute']);
  const unmutePromise = unmuteWatcher.wait_for('unmute');
  localTransceiver.direction = 'sendrecv';
  await exchangeOfferAnswer(pc1, pc2);

  await unmutePromise;
}, 'Changing transceiver direction to \'sendrecv\' unmutes the remote track');

promise_test(async t => {
  const pc1 = createPeerConnectionWithCleanup(t);
  const pc1Sender = pc1.addTrack(... await createTrackAndStreamWithCleanup(t));
  const localTransceiver = findTransceiverForSender(pc1, pc1Sender);
  const pc2 = createPeerConnectionWithCleanup(t);
  exchangeIceCandidates(pc1, pc2);

  const e = await exchangeOfferAndListenToOntrack(t, pc1, pc2);
  // Need to wait for the initial unmute event before closing, otherwise
  // there will be no transition from unmuted->muted.
  const muteWatcher = new EventWatcher(t, e.track, ['mute', 'unmute']);
  const unmutePromise = muteWatcher.wait_for('unmute');
  await exchangeAnswer(pc1, pc2);
  await unmutePromise;

  const mutePromise = muteWatcher.wait_for('mute');
  pc2.close();
  await mutePromise;
}, 'pc.close() mutes remote tracks');

</script>