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

  // Test is based on the following editor draft:
  // Test is based on the following editor draft:
  // https://w3c.github.io/webrtc-pc/archives/20170605/webrtc.html

  // The following helper functions are called from RTCPeerConnection-helper.js:
  //   assert_session_desc_similar
  //   generateAudioReceiveOnlyOffer
  //   generateAudioReceiveOnlyOffer

  /*
    4.3.2.  Interface Definition
      [Constructor(optional RTCConfiguration configuration)]
      interface RTCPeerConnection : EventTarget {
        Promise<void>                      setLocalDescription(
            RTCSessionDescriptionInit description);
            RTCSessionDescriptionInit description);

        readonly attribute RTCSessionDescription? localDescription;
        readonly attribute RTCSessionDescription? currentLocalDescription;
        readonly attribute RTCSessionDescription? pendingLocalDescription;


        Promise<void>                      setRemoteDescription(
            RTCSessionDescriptionInit description);

        readonly attribute RTCSessionDescription? remoteDescription;
        readonly attribute RTCSessionDescription? remoteDescription;
        readonly attribute RTCSessionDescription? currentRemoteDescription;
        readonly attribute RTCSessionDescription? pendingRemoteDescription;
        ...
      };


    4.6.2.  RTCSessionDescription Class
      dictionary RTCSessionDescriptionInit {
        required RTCSdpType type;
                 DOMString  sdp = "";
      };
      };


    4.6.1.  RTCSdpType
      enum RTCSdpType {
        "offer",
        "pranswer",
        "answer",
        "rollback"
      };
      };
   */

  /*
    4.3.1.6.  Set the RTCSessionSessionDescription
      2.2.2.  If description is set as a local description, then run one of the
      2.2.2.  If description is set as a local description, then run one of the
              following steps:
        - If description is of type "rollback", then this is a rollback. Set
          connection.pendingLocalDescription to null and signaling state to stable.
   */
  promise_test(t=> {
  promise_test(t=> {
    const pc = new RTCPeerConnection();
    t.add_cleanup(() => pc.close());

    const states = [];
    pc.addEventListener('signalingstatechange', () => states.push(pc.signalingState));
    pc.addEventListener('signalingstatechange', () => states.push(pc.signalingState));

    return pc.createOffer()
    .then(offer => pc.setLocalDescription(offer))
    .then(() => {
      assert_equals(pc.signalingState, 'have-local-offer');
      assert_equals(pc.signalingState, 'have-local-offer');
      assert_not_equals(pc.localDescription, null);
      assert_not_equals(pc.pendingLocalDescription, null);
      assert_equals(pc.currentLocalDescription, null);

      return pc.setLocalDescription({ type: 'rollback' });
      return pc.setLocalDescription({ type: 'rollback' });
    })
    .then(() => {
      assert_equals(pc.signalingState, 'stable');
      assert_equals(pc.localDescription, null);
      assert_equals(pc.localDescription, null);
      assert_equals(pc.pendingLocalDescription, null);
      assert_equals(pc.currentLocalDescription, null);

      assert_array_equals(states, ['have-local-offer', 'stable']);
    });
    });
  }, 'setLocalDescription(rollback) from have-local-offer state should reset back to stable state');

  /*
    4.3.1.6.  Set the RTCSessionSessionDescription
      2.3.  If the description's type is invalid for the current signaling state of
            connection, then reject p with a newly created InvalidStateError and abort
            these steps. Note that this implies that once the answerer has performed
            these steps. Note that this implies that once the answerer has performed
            setLocalDescription with his answer, this cannot be rolled back.

    [jsep]
      4.1.8.2.  Rollback
        - Rollback can only be used to cancel proposed changes;
        - Rollback can only be used to cancel proposed changes;
          there is no support for rolling back from a stable state to a
          previous stable state
   */
  promise_test(t => {
    const pc = new RTCPeerConnection();
    const pc = new RTCPeerConnection();
    t.add_cleanup(() => pc.close());
    return promise_rejects_dom(t, 'InvalidStateError',
      pc.setLocalDescription({ type: 'rollback' }));
  }, `setLocalDescription(rollback) from stable state should reject with InvalidStateError`);


  promise_test(t => {
    const pc = new RTCPeerConnection();
    t.add_cleanup(() => pc.close());
    return generateAudioReceiveOnlyOffer(pc)
    .then(offer =>
      pc.setRemoteDescription(offer)
      pc.setRemoteDescription(offer)
      .then(() => pc.createAnswer()))
    .then(answer => pc.setLocalDescription(answer))
    .then(() => {
      return promise_rejects_dom(t, 'InvalidStateError',
        pc.setLocalDescription({ type: 'rollback' }));
        pc.setLocalDescription({ type: 'rollback' }));
    });
  }, `setLocalDescription(rollback) after setting answer description should reject with InvalidStateError`);

  promise_test(t => {
    const pc = new RTCPeerConnection();
    t.add_cleanup(() => pc.close());
    return pc.createOffer()
    return pc.createOffer()
    .then(offer => pc.setLocalDescription(offer))
    .then(() => pc.setLocalDescription({
      type: 'rollback',
      sdp: '!<Invalid SDP Content>;'
    }));
    }));
  }, `setLocalDescription(rollback) should ignore invalid sdp content and succeed`);

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

    await pc.setLocalDescription(await pc.createOffer({offerToReceiveAudio: true}));
    const sldPromise = pc.setLocalDescription({type: "rollback"});

    assert_equals(pc.signalingState, "have-local-offer", "signalingState should not be set synchronously after a call to sLD");
    assert_equals(pc.signalingState, "have-local-offer", "signalingState should not be set synchronously after a call to sLD");

    assert_not_equals(pc.pendingLocalDescription, null, "pendingLocalDescription should not be set synchronously after a call to sLD");
    assert_equals(pc.pendingLocalDescription.type, "offer");
    assert_equals(pc.pendingLocalDescription.sdp, pc.localDescription.sdp);
    assert_equals(pc.pendingRemoteDescription, null, "pendingRemoteDescription should never be set due to sLD(offer)");
    assert_equals(pc.pendingRemoteDescription, null, "pendingRemoteDescription should never be set due to sLD(offer)");

    const stablePromise = new Promise(resolve => {
      pc.onsignalingstatechange = () => {
        resolve(pc.signalingState);
      }
      }
    });
    const raceValue = await Promise.race([stablePromise, sldPromise]);
    assert_equals(raceValue, "stable", "signalingstatechange event should fire before sLD resolves");
    assert_equals(pc.pendingLocalDescription, null, "pendingLocalDescription should be updated before the signalingstatechange event");
    assert_equals(pc.pendingRemoteDescription, null, "pendingRemoteDescription should never be set due to sLD(offer)");
    assert_equals(pc.pendingRemoteDescription, null, "pendingRemoteDescription should never be set due to sLD(offer)");

    await sldPromise;
  }, "setLocalDescription(rollback) should update internal state with a queued tassk, in the right order");
  }, "setLocalDescription(rollback) should update internal state with a queued tassk, in the right order");

</script>