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

  // 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
  //   generateAnswer

  // The following helper functions are called from RTCDTMFSender-helper.js
  //   test_tone_change_events
  //   getTransceiver

  /*
    7.  Peer-to-peer DTMF
      partial interface RTCRtpSender {
        readonly attribute RTCDTMFSender? dtmf;
      };

      interface RTCDTMFSender : EventTarget {
        void insertDTMF(DOMString tones,
                        optional unsigned long duration = 100,
                        optional unsigned long interToneGap = 70);
                 attribute EventHandler ontonechange;
        readonly attribute DOMString    toneBuffer;
      };

      [Constructor(DOMString type, RTCDTMFToneChangeEventInit eventInitDict)]
      interface RTCDTMFToneChangeEvent : Event {
        readonly attribute DOMString tone;
      };
   */

  /*
    7.2.  insertDTMF
      11. If a Playout task is scheduled to be run; abort these steps; otherwise queue
          a task that runs the following steps (Playout task):
        3.  If toneBuffer is an empty string, fire an event named tonechange with an
            empty string at the RTCDTMFSender object and abort these steps.
        4.  Remove the first character from toneBuffer and let that character be tone.
        6.  Queue a task to be executed in duration + interToneGap ms from now that
            runs the steps labelled Playout task.
        7.  Fire an event named tonechange with a string consisting of tone at the
            RTCDTMFSender object.
   */
  test_tone_change_events((t, dtmfSender) => {
    dtmfSender.insertDTMF('123');
  }, [
    ['1', '23', 0],
    ['2', '3', 170],
    ['3', '', 170],
    ['', '', 170]
  ], 'insertDTMF() with default duration and intertoneGap should fire tonechange events at the expected time');

  test_tone_change_events((t, dtmfSender) => {
    dtmfSender.insertDTMF('abc', 100, 70);
  }, [
    ['A', 'BC', 0],
    ['B', 'C', 170],
    ['C', '', 170],
    ['', '', 170]
  ], 'insertDTMF() with explicit duration and intertoneGap should fire tonechange events at the expected time');

  /*
    7.2.  insertDTMF
      10. If toneBuffer is an empty string, abort these steps.
   */
  async_test(t => {
    createDtmfSender()
    .then(dtmfSender => {
      dtmfSender.addEventListener('tonechange',
        t.unreached_func('Expect no tonechange event to be fired'));

      dtmfSender.insertDTMF('', 100, 70);

      t.step_timeout(t.step_func_done(), 300);
    })
    .catch(t.step_func(err => {
      assert_unreached(`Unexpected promise rejection: ${err}`);
    }));
  }, `insertDTMF('') should not fire any tonechange event, including for '' tone`);

  /*
    7.2.  insertDTMF
      8. If the value of the duration parameter is less than 40, set it to 40.
         If, on the other hand, the value is greater than 6000, set it to 6000.
   */
  test_tone_change_events((t, dtmfSender) => {
      dtmfSender.insertDTMF('ABC', 10, 70);
  }, [
    ['A', 'BC', 0],
    ['B', 'C', 110],
    ['C', '', 110],
    ['', '', 110]
  ], 'insertDTMF() with duration less than 40 should be clamped to 40');

  /*
    7.2.  insertDTMF
      9. If the value of the interToneGap parameter is less than 30, set it to 30.
   */
  test_tone_change_events((t, dtmfSender) => {
    dtmfSender.insertDTMF('ABC', 100, 10);
  }, [
    ['A', 'BC', 0],
    ['B', 'C', 130],
    ['C', '', 130],
    ['', '', 130]
  ],
  'insertDTMF() with interToneGap less than 30 should be clamped to 30');

  /*
    [w3c/webrtc-pc#1373]
    This step is added to handle the "," character correctly. "," supposed to delay the next
    tonechange event by 2000ms.

    7.2.  insertDTMF
      11.5. If tone is "," delay sending tones for 2000 ms on the associated RTP media
            stream, and queue a task to be executed in 2000 ms from now that runs the
            steps labelled Playout task.
   */
  test_tone_change_events((t, dtmfSender) => {
    dtmfSender.insertDTMF('A,B', 100, 70);

  }, [
    ['A', ',B', 0],
    [',', 'B', 170],
    ['B', '', 2000],
    ['', '', 170]
  ], 'insertDTMF with comma should delay next tonechange event for a constant 2000ms');

  /*
    7.2.  insertDTMF
      11.1. If transceiver.stopped is true, abort these steps.
   */
  test_tone_change_events((t, dtmfSender, pc) => {
    const transceiver = getTransceiver(pc);
    dtmfSender.addEventListener('tonechange', ev => {
      if(ev.tone === 'B') {
        transceiver.stop();
      }
    });

    dtmfSender.insertDTMF('ABC', 100, 70);
  }, [
    ['A', 'BC', 0],
    ['B', 'C', 170]
  ], 'insertDTMF() with transceiver stopped in the middle should stop future tonechange events from firing');

  /*
    7.2.  insertDTMF
      3.  If a Playout task is scheduled to be run, abort these steps;
          otherwise queue a task that runs the following steps (Playout task):
   */
  test_tone_change_events((t, dtmfSender) => {
    dtmfSender.addEventListener('tonechange', ev => {
      if(ev.tone === 'B') {
        dtmfSender.insertDTMF('12', 100, 70);
      }
    });

    dtmfSender.insertDTMF('ABC', 100, 70);
  }, [
    ['A', 'BC', 0],
    ['B', 'C', 170],
    ['1', '2', 170],
    ['2', '', 170],
    ['', '', 170]
  ], 'Calling insertDTMF() in the middle of tonechange events should cause future tonechanges to be updated to new tones');


  /*
    7.2.  insertDTMF
      3.  If a Playout task is scheduled to be run, abort these steps;
          otherwise queue a task that runs the following steps (Playout task):
   */
  test_tone_change_events((t, dtmfSender) => {
    dtmfSender.addEventListener('tonechange', ev => {
      if(ev.tone === 'B') {
        dtmfSender.insertDTMF('12', 100, 70);
        dtmfSender.insertDTMF('34', 100, 70);
      }
    });

    dtmfSender.insertDTMF('ABC', 100, 70);
  }, [
    ['A', 'BC', 0],
    ['B', 'C', 170],
    ['3', '4', 170],
    ['4', '', 170],
    ['', '', 170]
  ], 'Calling insertDTMF() multiple times in the middle of tonechange events should cause future tonechanges to be updated the last provided tones');

  /*
    7.2.  insertDTMF
      3.  If a Playout task is scheduled to be run, abort these steps;
          otherwise queue a task that runs the following steps (Playout task):
   */
  test_tone_change_events((t, dtmfSender) => {
    dtmfSender.addEventListener('tonechange', ev => {
      if(ev.tone === 'B') {
        dtmfSender.insertDTMF('');
      }
    });

    dtmfSender.insertDTMF('ABC', 100, 70);
  }, [
    ['A', 'BC', 0],
    ['B', 'C', 170],
    ['', '', 170]
  ], `Calling insertDTMF('') in the middle of tonechange events should stop future tonechange events from firing`);

  /*
    7.2.  insertDTMF
      11.2.  If transceiver.currentDirection is recvonly or inactive, abort these steps.
   */
  async_test(t => {
    const pc = new RTCPeerConnection();
    t.add_cleanup(() => pc.close());
    const transceiver = pc.addTransceiver('audio', { direction: 'sendrecv' });
    const dtmfSender = transceiver.sender.dtmf;

    // Since setRemoteDescription happens in parallel with tonechange event,
    // We use a flag and allow tonechange events to be fired as long as
    // the promise returned by setRemoteDescription is not yet resolved.
    let remoteDescriptionIsSet = false;

    // We only do basic tone verification and not check timing here
    let expectedTones = ['A', 'B', 'C', 'D', ''];

    const onToneChange = t.step_func(ev => {
      assert_false(remoteDescriptionIsSet,
        'Expect no tonechange event to be fired after currentDirection is changed to recvonly');

      const { tone } = ev;
      const expectedTone = expectedTones.shift();
      assert_equals(tone, expectedTone,
        `Expect fired event.tone to be ${expectedTone}`);

      // Only change transceiver.currentDirection after the first
      // tonechange event, to make sure that tonechange is triggered
      // then stopped
      if(tone === 'A') {
        transceiver.direction = 'recvonly';

        pc.createOffer()
        .then(offer =>
          pc.setLocalDescription(offer)
          .then(() => generateAnswer(offer)))
        .then(answer => pc.setRemoteDescription(answer))
        .then(() => {
          assert_equals(transceiver.currentDirection, 'recvonly');
          remoteDescriptionIsSet = true;

          // Pass the test if no further tonechange event is
          // fired in the next 300ms
          t.step_timeout(t.step_func_done(), 300);
        })
        .catch(t.step_func(err => {
          assert_unreached(`Unexpected promise rejection: ${err}`);
        }));
      }
    });

    dtmfSender.addEventListener('tonechange', onToneChange);
    dtmfSender.insertDTMF('ABCD', 100, 70);
  }, `Setting transceiver.currentDirection to recvonly in the middle of tonechange events should stop future tonechange events from firing`);

  /* Section 7.3 - Tone change event */
  test(t => {
    let ev = new RTCDTMFToneChangeEvent('tonechange', {'tone': '1'});
    assert_equals(ev.type, 'tonechange');
    assert_equals(ev.tone, '1');
  }, 'Tone change event constructor works');

  test(t => {
    let ev = new RTCDTMFToneChangeEvent('worngname', {});
  }, 'Tone change event with unexpected name should not crash');

</script>