<!doctype html>
<meta charset=utf-8>
<title>RTCRtpTransceiver.prototype.setDirection</title>
<script src="/resources/testharness.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:
  // https://rawgit.com/w3c/webrtc-pc/cc8d80f455b86c8041d63bceb8b457f45c72aa89/webrtc.html

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

  /*
    5.4.  RTCRtpTransceiver Interface
      interface RTCRtpTransceiver {
        readonly attribute RTCRtpTransceiverDirection  direction;
        readonly attribute RTCRtpTransceiverDirection? currentDirection;
        void setDirection(RTCRtpTransceiverDirection direction);
        ...
      };
   */

   /*
    5.4.  setDirection
      4.  Set transceiver's [[Direction]] slot to newDirection.
   */
  test(t => {
    const pc = new RTCPeerConnection();
    const transceiver = pc.addTransceiver('audio');
    assert_equals(transceiver.direction, 'sendrecv');
    assert_equals(transceiver.currentDirection, null);

    transceiver.setDirection('recvonly');
    assert_equals(transceiver.direction, 'recvonly');
    assert_equals(transceiver.currentDirection, null,
      'Expect transceiver.currentDirection to not change');

  }, 'setDirection should change transceiver.direction');

   /*
    5.4.  setDirection
      3.  If newDirection is equal to transceiver's [[Direction]] slot, abort
          these steps.
   */
  test(t => {
    const pc = new RTCPeerConnection();
    const transceiver = pc.addTransceiver('audio', { direction: 'sendonly' });
    assert_equals(transceiver.direction, 'sendonly');
    transceiver.setDirection('sendonly');
    assert_equals(transceiver.direction, 'sendonly');

  }, 'setDirection with same direction should have no effect');

  promise_test(t => {
    const pc = new RTCPeerConnection();
    t.add_cleanup(() => pc.close());
    const transceiver = pc.addTransceiver('audio', { direction: 'recvonly' });
    assert_equals(transceiver.direction, 'recvonly');
    assert_equals(transceiver.currentDirection, null);

    return pc.createOffer()
    .then(offer =>
      pc.setLocalDescription(offer)
      .then(() => generateAnswer(offer)))
    .then(answer => pc.setRemoteDescription(answer))
    .then(() => {
      assert_equals(transceiver.currentDirection, 'recvonly');
      transceiver.setDirection('sendrecv');
      assert_equals(transceiver.direction, 'sendrecv');
      assert_equals(transceiver.currentDirection, 'recvonly');
    });
  }, 'setDirection should change transceiver.direction independent of transceiver.currentDirection');

  /*
    TODO
        Calls to setDirection() do not take effect immediately. Instead, future calls
        to createOffer and createAnswer mark the corresponding media description as
        sendrecv, sendonly, recvonly or inactive as defined in [JSEP] (section 5.2.2.
        and section 5.3.2.).

    Tested in RTCPeerConnection-onnegotiationneeded.html
      5.4.  setDirection
        6.  Update the negotiation-needed flag for connection.

    Coverage Report
      Tested        6
      Not Tested    1
      Untestable    0
      Total         7
   */

</script>