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<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script src="RTCPeerConnection-helper.js"></script>
<script>
"use strict";

function getLines(sdp, startsWith) {
  const lines = sdp.split("\r\n").filter(l => l.startsWith(startsWith));
  assert_true(lines.length > 0, `One or more ${startsWith} in sdp`);
  return lines;
}

const getUfrags = ({sdp}) => getLines(sdp, "a=ice-ufrag:");
const getPwds = ({sdp}) => getLines(sdp, "a=ice-pwd:");

const negotiators = [
  {
    tag: "",
    async setOffer(pc) {
      await pc.setLocalDescription(await pc.createOffer());
    },
    async setAnswer(pc) {
      await pc.setLocalDescription(await pc.createAnswer());
    },
  },
  {
    tag: " (perfect negotiation)",
    async setOffer(pc) {
      await pc.setLocalDescription();
    },
    async setAnswer(pc) {
      await pc.setLocalDescription();
    },
  },
];

async function exchangeOfferAnswerEndOnFirst(pc1, pc2, negotiator) {
  await negotiator.setOffer(pc1);
  await pc2.setRemoteDescription(pc1.localDescription);
  await negotiator.setAnswer(pc2);
  await pc1.setRemoteDescription(pc2.localDescription); // End on pc1. No race
}

async function exchangeOfferAnswerEndOnSecond(pc1, pc2, negotiator) {
  await negotiator.setOffer(pc1);
  await pc2.setRemoteDescription(pc1.localDescription);
  await pc1.setRemoteDescription(await pc2.createAnswer());
  await pc2.setLocalDescription(pc1.remoteDescription); // End on pc2. No race
}

async function assertNoNegotiationNeeded(t, pc) {
  assert_equals(pc.signalingState, "stable", "In stable state");
  const event = await Promise.race([
    new Promise(r => pc.onnegotiationneeded = r),
    new Promise(r => t.step_timeout(r, 10))
  ]);
  assert_equals(event, undefined, "No negotiationneeded event");
}

// In Chromium, assert_equals() produces test expectations with the values
// compared. Because ufrags are different on each run, this would make Chromium
// test expectations different on each run on tests that failed when comparing
// ufrags. To work around this problem, assert_ufrags_equals() and
// assert_ufrags_not_equals() should be preferred over assert_equals() and
// assert_not_equals().
function assert_ufrags_equals(x, y, description) {
  assert_true(x === y, description);
}
function assert_ufrags_not_equals(x, y, description) {
  assert_false(x === y, description);
}

promise_test(async t => {
  const pc1 = new RTCPeerConnection();
  const pc2 = new RTCPeerConnection();
  t.add_cleanup(() => pc1.close());
  t.add_cleanup(() => pc2.close());

  pc1.restartIce();
  await assertNoNegotiationNeeded(t, pc1);
  pc1.addTransceiver("audio");
  await new Promise(r => pc1.onnegotiationneeded = r);
  await assertNoNegotiationNeeded(t, pc1);
}, "restartIce() does not trigger negotiation ahead of initial negotiation");

// Run remaining tests twice: once for each negotiator

for (const negotiator of negotiators) {
  const {tag} = negotiator;

  promise_test(async t => {
    const pc1 = new RTCPeerConnection();
    const pc2 = new RTCPeerConnection();
    t.add_cleanup(() => pc1.close());
    t.add_cleanup(() => pc2.close());

    pc1.addTransceiver("audio");
    await new Promise(r => pc1.onnegotiationneeded = r);
    pc1.restartIce();
    await exchangeOfferAnswerEndOnFirst(pc1, pc2, negotiator);
    await assertNoNegotiationNeeded(t, pc1);
  }, `restartIce() has no effect on initial negotiation${tag}`);

  promise_test(async t => {
    const pc1 = new RTCPeerConnection();
    const pc2 = new RTCPeerConnection();
    t.add_cleanup(() => pc1.close());
    t.add_cleanup(() => pc2.close());

    pc1.addTransceiver("audio");
    await new Promise(r => pc1.onnegotiationneeded = r);
    await exchangeOfferAnswerEndOnFirst(pc1, pc2, negotiator);
    pc1.restartIce();
    await new Promise(r => pc1.onnegotiationneeded = r);
  }, `restartIce() fires negotiationneeded after initial negotiation${tag}`);

  promise_test(async t => {
    const pc1 = new RTCPeerConnection();
    const pc2 = new RTCPeerConnection();
    t.add_cleanup(() => pc1.close());
    t.add_cleanup(() => pc2.close());

    pc1.addTransceiver("audio");
    await exchangeOfferAnswerEndOnFirst(pc1, pc2, negotiator);

    const [oldUfrag1] = getUfrags(pc1.localDescription);
    const [oldUfrag2] = getUfrags(pc2.localDescription);
    await exchangeOfferAnswerEndOnFirst(pc1, pc2, negotiator);
    assert_ufrags_equals(getUfrags(pc1.localDescription)[0], oldUfrag1, "control 1");
    assert_ufrags_equals(getUfrags(pc2.localDescription)[0], oldUfrag2, "control 2");

    pc1.restartIce();
    await new Promise(r => pc1.onnegotiationneeded = r);
    await exchangeOfferAnswerEndOnFirst(pc1, pc2, negotiator);
    const [newUfrag1] = getUfrags(pc1.localDescription);
    const [newUfrag2] = getUfrags(pc2.localDescription);
    assert_ufrags_not_equals(newUfrag1, oldUfrag1, "ufrag 1 changed");
    assert_ufrags_not_equals(newUfrag1, oldUfrag2, "ufrag 2 changed");
    await assertNoNegotiationNeeded(t, pc1);

    await exchangeOfferAnswerEndOnFirst(pc1, pc2, negotiator);
    assert_ufrags_equals(getUfrags(pc1.localDescription)[0], newUfrag1, "Unchanged 1");
    assert_ufrags_equals(getUfrags(pc2.localDescription)[0], newUfrag2, "Unchanged 2");
  }, `restartIce() causes fresh ufrags${tag}`);

  promise_test(async t => {
    const config = {bundlePolicy: "max-bundle"};
    const pc1 = new RTCPeerConnection(config);
    const pc2 = new RTCPeerConnection(config);
    t.add_cleanup(() => pc1.close());
    t.add_cleanup(() => pc2.close());

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

    // See the explanation below about Chrome's onnegotiationneeded firing
    // too early.
    const negotiationNeededPromise1 =
        new Promise(r => pc1.onnegotiationneeded = r);
    pc1.addTransceiver("video");
    pc1.addTransceiver("audio");
    await negotiationNeededPromise1;
    await exchangeOfferAnswerEndOnFirst(pc1, pc2, negotiator);

    const [videoTc, audioTc] = pc1.getTransceivers();
    const [videoTp, audioTp] =
        pc1.getTransceivers().map(tc => tc.sender.transport);
    assert_equals(pc1.getTransceivers().length, 2, 'transceiver count');

    // On Chrome, it is possible (likely, even) that videoTc.sender.transport.state
    // will be 'connected' by the time we get here.  We'll race 2 promises here:
    // 1. Resolve after onstatechange is called with connected state.
    // 2. If already connected, resolve immediately.
    await Promise.race([
      new Promise(r => videoTc.sender.transport.onstatechange =
        () => videoTc.sender.transport.state == "connected" && r()),
      new Promise(r => videoTc.sender.transport.state == "connected" && r())
    ]);
    assert_equals(videoTc.sender.transport.state, "connected");

    await exchangeOfferAnswerEndOnFirst(pc1, pc2, negotiator);
    assert_equals(videoTp, pc1.getTransceivers()[0].sender.transport,
                  'offer/answer retains dtls transport');
    assert_equals(audioTp, pc1.getTransceivers()[1].sender.transport,
                  'offer/answer retains dtls transport');

    const negotiationNeededPromise2 =
        new Promise(r => pc1.onnegotiationneeded = r);
    pc1.restartIce();
    await negotiationNeededPromise2;
    await exchangeOfferAnswerEndOnFirst(pc1, pc2, negotiator);

    const [newVideoTp, newAudioTp] =
        pc1.getTransceivers().map(tc => tc.sender.transport);
    assert_equals(videoTp, newVideoTp, 'ice restart retains dtls transport');
    assert_equals(audioTp, newAudioTp, 'ice restart retains dtls transport');
  }, `restartIce() retains dtls transports${tag}`);

  promise_test(async t => {
    const pc1 = new RTCPeerConnection();
    const pc2 = new RTCPeerConnection();
    t.add_cleanup(() => pc1.close());
    t.add_cleanup(() => pc2.close());

    pc1.addTransceiver("audio");
    await new Promise(r => pc1.onnegotiationneeded = r);
    await exchangeOfferAnswerEndOnFirst(pc1, pc2, negotiator);

    const [oldUfrag1] = getUfrags(pc1.localDescription);
    const [oldUfrag2] = getUfrags(pc2.localDescription);

    await negotiator.setOffer(pc1);
    pc1.restartIce();
    await pc2.setRemoteDescription(pc1.localDescription);
    await negotiator.setAnswer(pc2);
    // Several tests in this file initializes the onnegotiationneeded listener
    // before the setLocalDescription() or setRemoteDescription() that we expect
    // to trigger negotiation needed. This allows Chrome to exercise these tests
    // without timing out due to a bug that causes onnegotiationneeded to fire too
    // early.
    // TODO(https://crbug.com/985797): Once Chrome does not fire ONN too early,
    // simply do "await new Promise(...)" instead of
    // "await negotiationNeededPromise" here and in other tests in this file.
    const negotiationNeededPromise =
        new Promise(r => pc1.onnegotiationneeded = r);
    await pc1.setRemoteDescription(pc2.localDescription);
    assert_ufrags_equals(getUfrags(pc1.localDescription)[0], oldUfrag1, "Unchanged 1");
    assert_ufrags_equals(getUfrags(pc2.localDescription)[0], oldUfrag2, "Unchanged 2");
    await negotiationNeededPromise;
    await exchangeOfferAnswerEndOnFirst(pc1, pc2, negotiator);
    const [newUfrag1] = getUfrags(pc1.localDescription);
    const [newUfrag2] = getUfrags(pc2.localDescription);
    assert_ufrags_not_equals(newUfrag1, oldUfrag1, "ufrag 1 changed");
    assert_ufrags_not_equals(newUfrag1, oldUfrag2, "ufrag 2 changed");
    await assertNoNegotiationNeeded(t, pc1);
  }, `restartIce() works in have-local-offer${tag}`);

  promise_test(async t => {
    const pc1 = new RTCPeerConnection();
    const pc2 = new RTCPeerConnection();
    t.add_cleanup(() => pc1.close());
    t.add_cleanup(() => pc2.close());

    pc1.addTransceiver("audio");
    await new Promise(r => pc1.onnegotiationneeded = r);
    await negotiator.setOffer(pc1);
    pc1.restartIce();
    await pc2.setRemoteDescription(pc1.localDescription);
    await negotiator.setAnswer(pc2);
    const negotiationNeededPromise =
        new Promise(r => pc1.onnegotiationneeded = r);
    await pc1.setRemoteDescription(pc2.localDescription);
    const [oldUfrag1] = getUfrags(pc1.localDescription);
    const [oldUfrag2] = getUfrags(pc2.localDescription);
    await negotiationNeededPromise;
    await exchangeOfferAnswerEndOnFirst(pc1, pc2, negotiator);
    const [newUfrag1] = getUfrags(pc1.localDescription);
    const [newUfrag2] = getUfrags(pc2.localDescription);
    assert_ufrags_not_equals(newUfrag1, oldUfrag1, "ufrag 1 changed");
    assert_ufrags_not_equals(newUfrag1, oldUfrag2, "ufrag 2 changed");
    await assertNoNegotiationNeeded(t, pc1);
  }, `restartIce() works in initial have-local-offer${tag}`);

  promise_test(async t => {
    const pc1 = new RTCPeerConnection();
    const pc2 = new RTCPeerConnection();
    t.add_cleanup(() => pc1.close());
    t.add_cleanup(() => pc2.close());

    pc1.addTransceiver("audio");
    await new Promise(r => pc1.onnegotiationneeded = r);
    await exchangeOfferAnswerEndOnFirst(pc1, pc2, negotiator);

    const [oldUfrag1] = getUfrags(pc1.localDescription);
    const [oldUfrag2] = getUfrags(pc2.localDescription);

    await negotiator.setOffer(pc2);
    await pc1.setRemoteDescription(pc2.localDescription);
    pc1.restartIce();
    await pc2.setRemoteDescription(await pc1.createAnswer());
    const negotiationNeededPromise =
        new Promise(r => pc1.onnegotiationneeded = r);
    await pc1.setLocalDescription(pc2.remoteDescription); // End on pc1. No race
    assert_ufrags_equals(getUfrags(pc1.localDescription)[0], oldUfrag1, "Unchanged 1");
    assert_ufrags_equals(getUfrags(pc2.localDescription)[0], oldUfrag2, "Unchanged 2");
    await negotiationNeededPromise;
    await exchangeOfferAnswerEndOnFirst(pc1, pc2, negotiator);
    const [newUfrag1] = getUfrags(pc1.localDescription);
    const [newUfrag2] = getUfrags(pc2.localDescription);
    assert_ufrags_not_equals(newUfrag1, oldUfrag1, "ufrag 1 changed");
    assert_ufrags_not_equals(newUfrag1, oldUfrag2, "ufrag 2 changed");
    await assertNoNegotiationNeeded(t, pc1);
  }, `restartIce() works in have-remote-offer${tag}`);

  promise_test(async t => {
    const pc1 = new RTCPeerConnection();
    const pc2 = new RTCPeerConnection();
    t.add_cleanup(() => pc1.close());
    t.add_cleanup(() => pc2.close());

    pc2.addTransceiver("audio");
    await negotiator.setOffer(pc2);
    await pc1.setRemoteDescription(pc2.localDescription);
    pc1.restartIce();
    await pc2.setRemoteDescription(await pc1.createAnswer());
    await pc1.setLocalDescription(pc2.remoteDescription); // End on pc1. No race
    await assertNoNegotiationNeeded(t, pc1);
  }, `restartIce() does nothing in initial have-remote-offer${tag}`);

  promise_test(async t => {
    const pc1 = new RTCPeerConnection();
    const pc2 = new RTCPeerConnection();
    t.add_cleanup(() => pc1.close());
    t.add_cleanup(() => pc2.close());

    pc1.addTransceiver("audio");
    await new Promise(r => pc1.onnegotiationneeded = r);
    await exchangeOfferAnswerEndOnFirst(pc1, pc2, negotiator);

    const [oldUfrag1] = getUfrags(pc1.localDescription);
    const [oldUfrag2] = getUfrags(pc2.localDescription);

    pc1.restartIce();
    await new Promise(r => pc1.onnegotiationneeded = r);
    const negotiationNeededPromise =
        new Promise(r => pc1.onnegotiationneeded = r);
    await exchangeOfferAnswerEndOnSecond(pc2, pc1, negotiator);
    assert_ufrags_equals(getUfrags(pc1.localDescription)[0], oldUfrag1, "nothing yet 1");
    assert_ufrags_equals(getUfrags(pc2.localDescription)[0], oldUfrag2, "nothing yet 2");
    await negotiationNeededPromise;
    await exchangeOfferAnswerEndOnFirst(pc1, pc2, negotiator);
    const [newUfrag1] = getUfrags(pc1.localDescription);
    const [newUfrag2] = getUfrags(pc2.localDescription);
    assert_ufrags_not_equals(newUfrag1, oldUfrag1, "ufrag 1 changed");
    assert_ufrags_not_equals(newUfrag2, oldUfrag2, "ufrag 2 changed");
    await assertNoNegotiationNeeded(t, pc1);
  }, `restartIce() survives remote offer${tag}`);

  promise_test(async t => {
    const pc1 = new RTCPeerConnection();
    const pc2 = new RTCPeerConnection();
    t.add_cleanup(() => pc1.close());
    t.add_cleanup(() => pc2.close());

    pc1.addTransceiver("audio");
    await new Promise(r => pc1.onnegotiationneeded = r);
    await exchangeOfferAnswerEndOnFirst(pc1, pc2, negotiator);

    const [oldUfrag1] = getUfrags(pc1.localDescription);
    const [oldUfrag2] = getUfrags(pc2.localDescription);

    pc1.restartIce();
    pc2.restartIce();
    await new Promise(r => pc1.onnegotiationneeded = r);
    await exchangeOfferAnswerEndOnSecond(pc2, pc1, negotiator);
    const [newUfrag1] = getUfrags(pc1.localDescription);
    const [newUfrag2] = getUfrags(pc2.localDescription);
    assert_ufrags_not_equals(newUfrag1, oldUfrag1, "ufrag 1 changed");
    assert_ufrags_not_equals(newUfrag1, oldUfrag2, "ufrag 2 changed");
    await assertNoNegotiationNeeded(t, pc1);

    await exchangeOfferAnswerEndOnFirst(pc1, pc2, negotiator);
    assert_ufrags_equals(getUfrags(pc1.localDescription)[0], newUfrag1, "Unchanged 1");
    assert_ufrags_equals(getUfrags(pc2.localDescription)[0], newUfrag2, "Unchanged 2");
    await assertNoNegotiationNeeded(t, pc1);
  }, `restartIce() is satisfied by remote ICE restart${tag}`);

  promise_test(async t => {
    const pc1 = new RTCPeerConnection();
    const pc2 = new RTCPeerConnection();
    t.add_cleanup(() => pc1.close());
    t.add_cleanup(() => pc2.close());

    pc1.addTransceiver("audio");
    await new Promise(r => pc1.onnegotiationneeded = r);
    await exchangeOfferAnswerEndOnFirst(pc1, pc2, negotiator);

    const [oldUfrag1] = getUfrags(pc1.localDescription);
    const [oldUfrag2] = getUfrags(pc2.localDescription);

    pc1.restartIce();
    await new Promise(r => pc1.onnegotiationneeded = r);
    await pc1.setLocalDescription(await pc1.createOffer({iceRestart: false}));
    await pc2.setRemoteDescription(pc1.localDescription);
    await negotiator.setAnswer(pc2);
    await pc1.setRemoteDescription(pc2.localDescription);
    const [newUfrag1] = getUfrags(pc1.localDescription);
    const [newUfrag2] = getUfrags(pc2.localDescription);
    assert_ufrags_not_equals(newUfrag1, oldUfrag1, "ufrag 1 changed");
    assert_ufrags_not_equals(newUfrag1, oldUfrag2, "ufrag 2 changed");
    await assertNoNegotiationNeeded(t, pc1);
  }, `restartIce() trumps {iceRestart: false}${tag}`);

  promise_test(async t => {
    const pc1 = new RTCPeerConnection();
    const pc2 = new RTCPeerConnection();
    t.add_cleanup(() => pc1.close());
    t.add_cleanup(() => pc2.close());

    pc1.addTransceiver("audio");
    await new Promise(r => pc1.onnegotiationneeded = r);
    await exchangeOfferAnswerEndOnFirst(pc1, pc2, negotiator);

    const [oldUfrag1] = getUfrags(pc1.localDescription);
    const [oldUfrag2] = getUfrags(pc2.localDescription);

    pc1.restartIce();
    await new Promise(r => pc1.onnegotiationneeded = r);
    await negotiator.setOffer(pc1);
    const negotiationNeededPromise =
        new Promise(r => pc1.onnegotiationneeded = r);
    await pc1.setLocalDescription({type: "rollback"});
    await negotiationNeededPromise;
    await exchangeOfferAnswerEndOnFirst(pc1, pc2, negotiator);
    const [newUfrag1] = getUfrags(pc1.localDescription);
    const [newUfrag2] = getUfrags(pc2.localDescription);
    assert_ufrags_not_equals(newUfrag1, oldUfrag1, "ufrag 1 changed");
    assert_ufrags_not_equals(newUfrag1, oldUfrag2, "ufrag 2 changed");
    await assertNoNegotiationNeeded(t, pc1);
  }, `restartIce() survives rollback${tag}`);

  promise_test(async t => {
    const pc1 = new RTCPeerConnection({bundlePolicy: "max-compat"});
    const pc2 = new RTCPeerConnection({bundlePolicy: "max-compat"});
    t.add_cleanup(() => pc1.close());
    t.add_cleanup(() => pc2.close());

    pc1.addTransceiver("audio");
    pc1.addTransceiver("video");
    await new Promise(r => pc1.onnegotiationneeded = r);
    await exchangeOfferAnswerEndOnFirst(pc1, pc2, negotiator);

    const oldUfrags1 = getUfrags(pc1.localDescription);
    const oldUfrags2 = getUfrags(pc2.localDescription);
    const oldPwds2 = getPwds(pc2.localDescription);

    pc1.restartIce();
    await new Promise(r => pc1.onnegotiationneeded = r);

    // Engineer a partial ICE restart from pc2
    pc2.restartIce();
    await negotiator.setOffer(pc2);
    {
      let {type, sdp} = pc2.localDescription;
      // Restore both old ice-ufrag and old ice-pwd to trigger a partial restart
      sdp = sdp.replace(getUfrags({sdp})[0], oldUfrags2[0]);
      sdp = sdp.replace(getPwds({sdp})[0], oldPwds2[0]);
      const newUfrags2 = getUfrags({sdp});
      const newPwds2 = getPwds({sdp});
      assert_ufrags_equals(newUfrags2[0], oldUfrags2[0], "control ufrag match");
      assert_ufrags_equals(newPwds2[0], oldPwds2[0], "control pwd match");
      assert_ufrags_not_equals(newUfrags2[1], oldUfrags2[1], "control ufrag non-match");
      assert_ufrags_not_equals(newPwds2[1], oldPwds2[1], "control pwd non-match");
      await pc1.setRemoteDescription({type, sdp});
    }
    const negotiationNeededPromise =
        new Promise(r => pc1.onnegotiationneeded = r);
    await negotiator.setAnswer(pc1);
    const newUfrags1 = getUfrags(pc1.localDescription);
    assert_ufrags_equals(newUfrags1[0], oldUfrags1[0], "Unchanged 1");
    assert_ufrags_not_equals(newUfrags1[1], oldUfrags1[1], "Restarted 2");
    await negotiationNeededPromise;
    await negotiator.setOffer(pc1);
    const newestUfrags1 = getUfrags(pc1.localDescription);
    assert_ufrags_not_equals(newestUfrags1[0], oldUfrags1[0], "Restarted 1");
    assert_ufrags_not_equals(newestUfrags1[1], oldUfrags1[1], "Restarted 2");
    await assertNoNegotiationNeeded(t, pc1);
  }, `restartIce() survives remote offer containing partial restart${tag}`);

}

</script>