/**
 * Default list of commands to execute for a PeerConnection test.
 */

const STABLE = "stable";
const HAVE_LOCAL_OFFER = "have-local-offer";
const HAVE_REMOTE_OFFER = "have-remote-offer";
const CLOSED = "closed";

const ICE_NEW = "new";
const GATH_NEW = "new";
const GATH_GATH = "gathering";
const GATH_COMPLETE = "complete"

function deltaSeconds(date1, date2) {
  return (date2.getTime() - date1.getTime())/1000;
}

function dumpSdp(test) {
  if (typeof test._local_offer !== 'undefined') {
    dump("ERROR: SDP offer: " + test._local_offer.sdp.replace(/[\r]/g, ''));
  }
  if (typeof test._remote_answer !== 'undefined') {
    dump("ERROR: SDP answer: " + test._remote_answer.sdp.replace(/[\r]/g, ''));
  }

  if ((test.pcLocal) && (typeof test.pcLocal._local_ice_candidates !== 'undefined')) {
    dump("pcLocal._local_ice_candidates: " + JSON.stringify(test.pcLocal._local_ice_candidates) + "\n");
    dump("pcLocal._remote_ice_candidates: " + JSON.stringify(test.pcLocal._remote_ice_candidates) + "\n");
    dump("pcLocal._ice_candidates_to_add: " + JSON.stringify(test.pcLocal._ice_candidates_to_add) + "\n");
  }
  if ((test.pcRemote) && (typeof test.pcRemote._local_ice_candidates !== 'undefined')) {
    dump("pcRemote._local_ice_candidates: " + JSON.stringify(test.pcRemote._local_ice_candidates) + "\n");
    dump("pcRemote._remote_ice_candidates: " + JSON.stringify(test.pcRemote._remote_ice_candidates) + "\n");
    dump("pcRemote._ice_candidates_to_add: " + JSON.stringify(test.pcRemote._ice_candidates_to_add) + "\n");
  }

  if ((test.pcLocal) && (typeof test.pcLocal.iceConnectionLog !== 'undefined')) {
    dump("pcLocal ICE connection state log: " + test.pcLocal.iceConnectionLog + "\n");
  }
  if ((test.pcRemote) && (typeof test.pcRemote.iceConnectionLog !== 'undefined')) {
    dump("pcRemote ICE connection state log: " + test.pcRemote.iceConnectionLog + "\n");
  }

  if ((test.pcLocal) && (test.pcRemote) &&
    (typeof test.pcLocal.setRemoteDescDate !== 'undefined') &&
    (typeof test.pcRemote.setLocalDescDate !== 'undefined')) {
    var delta = deltaSeconds(test.pcLocal.setRemoteDescDate, test.pcRemote.setLocalDescDate);
    dump("Delay between pcLocal.setRemote <-> pcRemote.setLocal: " + delta + "\n");
  }
  if ((test.pcLocal) && (test.pcRemote) &&
    (typeof test.pcLocal.setRemoteDescDate !== 'undefined') &&
    (typeof test.pcLocal.setRemoteDescStableEventDate !== 'undefined')) {
    var delta = deltaSeconds(test.pcLocal.setRemoteDescDate, test.pcLocal.setRemoteDescStableEventDate);
    dump("Delay between pcLocal.setRemote <-> pcLocal.signalingStateStable: " + delta + "\n");
  }
  if ((test.pcLocal) && (test.pcRemote) &&
    (typeof test.pcRemote.setLocalDescDate !== 'undefined') &&
    (typeof test.pcRemote.setLocalDescStableEventDate !== 'undefined')) {
    var delta = deltaSeconds(test.pcRemote.setLocalDescDate, test.pcRemote.setLocalDescStableEventDate);
    dump("Delay between pcRemote.setLocal <-> pcRemote.signalingStateStable: " + delta + "\n");
  }
}

// We need to verify that at least one candidate has been (or will be) gathered.
function waitForAnIceCandidate(pc) {
  return new Promise(resolve => {
    if (!pc.localRequiresTrickleIce ||
        pc._local_ice_candidates.length > 0) {
      resolve();
    } else {
      // In some circumstances, especially when both PCs are on the same
      // browser, even though we are connected, the connection can be
      // established without receiving a single candidate from one or other
      // peer.  So we wait for at least one...
      pc._pc.addEventListener('icecandidate', resolve);
    }
  }).then(() => {
    ok(pc._local_ice_candidates.length > 0,
       pc + " received local trickle ICE candidates");
    isnot(pc._pc.iceGatheringState, GATH_NEW,
          pc + " ICE gathering state is not 'new'");
  });
}

function checkTrackStats(pc, rtpSenderOrReceiver, outbound) {
  var track = rtpSenderOrReceiver.track;
  var audio = (track.kind == "audio");
  var msg = pc + " stats " + (outbound ? "outbound " : "inbound ") +
      (audio ? "audio" : "video") + " rtp track id " + track.id;
  return pc.getStats(track).then(stats => {
    ok(pc.hasStat(stats, {
      type: outbound ? "outbound-rtp" : "inbound-rtp",
      isRemote: false,
      mediaType: audio ? "audio" : "video"
    }), msg + " - found expected stats");
    ok(!pc.hasStat(stats, {
      type: outbound ? "inbound-rtp" : "outbound-rtp",
      isRemote: false
    }), msg + " - did not find extra stats with wrong direction");
    ok(!pc.hasStat(stats, {
      mediaType: audio ? "video" : "audio"
    }), msg + " - did not find extra stats with wrong media type");
  });
}

var checkAllTrackStats = pc => {
  return Promise.all([].concat(
    pc._pc.getSenders().map(sender => checkTrackStats(pc, sender, true)),
    pc._pc.getReceivers().map(receiver => checkTrackStats(pc, receiver, false))));
}

// Commands run once at the beginning of each test, even when performing a
// renegotiation test.
var commandsPeerConnectionInitial = [
  function PC_SETUP_SIGNALING_CLIENT(test) {
    if (test.testOptions.steeplechase) {
      test.setupSignalingClient();
      test.registerSignalingCallback("ice_candidate", function (message) {
        var pc = test.pcRemote ? test.pcRemote : test.pcLocal;
        pc.storeOrAddIceCandidate(message.ice_candidate);
      });
      test.registerSignalingCallback("end_of_trickle_ice", function (message) {
        test.signalingMessagesFinished();
      });
    }
  },

  function PC_LOCAL_SETUP_ICE_LOGGER(test) {
    test.pcLocal.logIceConnectionState();
  },

  function PC_REMOTE_SETUP_ICE_LOGGER(test) {
    test.pcRemote.logIceConnectionState();
  },

  function PC_LOCAL_SETUP_SIGNALING_LOGGER(test) {
    test.pcLocal.logSignalingState();
  },

  function PC_REMOTE_SETUP_SIGNALING_LOGGER(test) {
    test.pcRemote.logSignalingState();
  },

  function PC_LOCAL_SETUP_TRACK_HANDLER(test) {
    test.pcLocal.setupTrackEventHandler();
  },

  function PC_REMOTE_SETUP_TRACK_HANDLER(test) {
    test.pcRemote.setupTrackEventHandler();
  },

  function PC_LOCAL_CHECK_INITIAL_SIGNALINGSTATE(test) {
    is(test.pcLocal.signalingState, STABLE,
       "Initial local signalingState is 'stable'");
  },

  function PC_REMOTE_CHECK_INITIAL_SIGNALINGSTATE(test) {
    is(test.pcRemote.signalingState, STABLE,
       "Initial remote signalingState is 'stable'");
  },

  function PC_LOCAL_CHECK_INITIAL_ICE_STATE(test) {
    is(test.pcLocal.iceConnectionState, ICE_NEW,
       "Initial local ICE connection state is 'new'");
  },

  function PC_REMOTE_CHECK_INITIAL_ICE_STATE(test) {
    is(test.pcRemote.iceConnectionState, ICE_NEW,
       "Initial remote ICE connection state is 'new'");
  },

  function PC_LOCAL_CHECK_INITIAL_CAN_TRICKLE_SYNC(test) {
    is(test.pcLocal._pc.canTrickleIceCandidates, null,
       "Local trickle status should start out unknown");
  },

  function PC_REMOTE_CHECK_INITIAL_CAN_TRICKLE_SYNC(test) {
    is(test.pcRemote._pc.canTrickleIceCandidates, null,
       "Remote trickle status should start out unknown");
  },
];

var commandsGetUserMedia = [
  function PC_LOCAL_GUM(test) {
    return test.pcLocal.getAllUserMedia(test.pcLocal.constraints);
  },

  function PC_REMOTE_GUM(test) {
    return test.pcRemote.getAllUserMedia(test.pcRemote.constraints);
  },
];

var commandsPeerConnectionOfferAnswer = [
  function PC_LOCAL_SETUP_ICE_HANDLER(test) {
    test.pcLocal.setupIceCandidateHandler(test);
  },

  function PC_REMOTE_SETUP_ICE_HANDLER(test) {
    test.pcRemote.setupIceCandidateHandler(test);
  },

  function PC_LOCAL_STEEPLECHASE_SIGNAL_EXPECTED_LOCAL_TRACKS(test) {
    if (test.testOptions.steeplechase) {
      send_message({"type": "local_expected_tracks",
                    "expected_tracks": test.pcLocal.expectedLocalTrackInfoById});
    }
  },

  function PC_REMOTE_STEEPLECHASE_SIGNAL_EXPECTED_LOCAL_TRACKS(test) {
    if (test.testOptions.steeplechase) {
      send_message({"type": "remote_expected_tracks",
                    "expected_tracks": test.pcRemote.expectedLocalTrackInfoById});
    }
  },

  function PC_LOCAL_GET_EXPECTED_REMOTE_TRACKS(test) {
    if (test.testOptions.steeplechase) {
      return test.getSignalingMessage("remote_expected_tracks").then(
          message => {
            test.pcLocal.expectedRemoteTrackInfoById = message.expected_tracks;
          });
    }

    // Deep copy, as similar to steeplechase as possible
    test.pcLocal.expectedRemoteTrackInfoById =
      JSON.parse(JSON.stringify(test.pcRemote.expectedLocalTrackInfoById));
  },

  function PC_REMOTE_GET_EXPECTED_REMOTE_TRACKS(test) {
    if (test.testOptions.steeplechase) {
      return test.getSignalingMessage("local_expected_tracks").then(
          message => {
            test.pcRemote.expectedRemoteTrackInfoById = message.expected_tracks;
          });
    }

    // Deep copy, as similar to steeplechase as possible
    test.pcRemote.expectedRemoteTrackInfoById =
      JSON.parse(JSON.stringify(test.pcLocal.expectedLocalTrackInfoById));
  },

  function PC_LOCAL_CREATE_OFFER(test) {
    return test.createOffer(test.pcLocal).then(offer => {
      is(test.pcLocal.signalingState, STABLE,
         "Local create offer does not change signaling state");
    });
  },

  function PC_LOCAL_STEEPLECHASE_SIGNAL_OFFER(test) {
    if (test.testOptions.steeplechase) {
      send_message({"type": "offer",
                    "offer": test.originalOffer,
                    "offer_constraints": test.pcLocal.constraints,
                    "offer_options": test.pcLocal.offerOptions});
      test._local_offer = test.originalOffer;
      test._offer_constraints = test.pcLocal.constraints;
      test._offer_options = test.pcLocal.offerOptions;
    }
  },

  function PC_LOCAL_SET_LOCAL_DESCRIPTION(test) {
    return test.setLocalDescription(test.pcLocal, test.originalOffer, HAVE_LOCAL_OFFER)
      .then(() => {
        is(test.pcLocal.signalingState, HAVE_LOCAL_OFFER,
           "signalingState after local setLocalDescription is 'have-local-offer'");
      });
  },

  function PC_REMOTE_GET_OFFER(test) {
    if (!test.testOptions.steeplechase) {
      test._local_offer = test.originalOffer;
      test._offer_constraints = test.pcLocal.constraints;
      test._offer_options = test.pcLocal.offerOptions;
      return Promise.resolve();
    }
    return test.getSignalingMessage("offer")
      .then(message => {
        ok("offer" in message, "Got an offer message");
        test._local_offer = new RTCSessionDescription(message.offer);
        test._offer_constraints = message.offer_constraints;
        test._offer_options = message.offer_options;
      });
  },

  function PC_REMOTE_SET_REMOTE_DESCRIPTION(test) {
    return test.setRemoteDescription(test.pcRemote, test._local_offer, HAVE_REMOTE_OFFER)
      .then(() => {
        is(test.pcRemote.signalingState, HAVE_REMOTE_OFFER,
           "signalingState after remote setRemoteDescription is 'have-remote-offer'");
      });
  },

  function PC_REMOTE_CHECK_CAN_TRICKLE_SYNC(test) {
    is(test.pcRemote._pc.canTrickleIceCandidates, true,
       "Remote thinks that local can trickle");
  },

  function PC_LOCAL_SANE_LOCAL_SDP(test) {
    test.pcLocal.localRequiresTrickleIce =
      sdputils.verifySdp(test._local_offer, "offer",
                         test._offer_constraints, test._offer_options,
                         test.testOptions);
  },

  function PC_REMOTE_SANE_REMOTE_SDP(test) {
    test.pcRemote.remoteRequiresTrickleIce =
      sdputils.verifySdp(test._local_offer, "offer",
                         test._offer_constraints, test._offer_options,
                         test.testOptions);
  },

  function PC_REMOTE_CREATE_ANSWER(test) {
    return test.createAnswer(test.pcRemote)
      .then(answer => {
        is(test.pcRemote.signalingState, HAVE_REMOTE_OFFER,
           "Remote createAnswer does not change signaling state");
        if (test.testOptions.steeplechase) {
          send_message({"type": "answer",
                        "answer": test.originalAnswer,
                        "answer_constraints": test.pcRemote.constraints});
          test._remote_answer = test.pcRemote._last_answer;
          test._answer_constraints = test.pcRemote.constraints;
        }
      });
  },

  function PC_REMOTE_SET_LOCAL_DESCRIPTION(test) {
    return test.setLocalDescription(test.pcRemote, test.originalAnswer, STABLE)
      .then(() => {
        is(test.pcRemote.signalingState, STABLE,
           "signalingState after remote setLocalDescription is 'stable'");
      })
      .then(() => test.pcRemote.markRemoteTracksAsNegotiated());
  },

  function PC_LOCAL_GET_ANSWER(test) {
    if (!test.testOptions.steeplechase) {
      test._remote_answer = test.originalAnswer;
      test._answer_constraints = test.pcRemote.constraints;
      return Promise.resolve();
    }

    return test.getSignalingMessage("answer").then(message => {
      ok("answer" in message, "Got an answer message");
      test._remote_answer = new RTCSessionDescription(message.answer);
      test._answer_constraints = message.answer_constraints;
    });
  },

  function PC_LOCAL_SET_REMOTE_DESCRIPTION(test) {
    return test.setRemoteDescription(test.pcLocal, test._remote_answer, STABLE)
      .then(() => {
        is(test.pcLocal.signalingState, STABLE,
           "signalingState after local setRemoteDescription is 'stable'");
      })
      .then(() => test.pcLocal.markRemoteTracksAsNegotiated());
  },

  function PC_REMOTE_SANE_LOCAL_SDP(test) {
    test.pcRemote.localRequiresTrickleIce =
      sdputils.verifySdp(test._remote_answer, "answer",
                         test._offer_constraints, test._offer_options,
                         test.testOptions);
  },
  function PC_LOCAL_SANE_REMOTE_SDP(test) {
    test.pcLocal.remoteRequiresTrickleIce =
      sdputils.verifySdp(test._remote_answer, "answer",
                         test._offer_constraints, test._offer_options,
                         test.testOptions);
  },

  function PC_LOCAL_CHECK_CAN_TRICKLE_SYNC(test) {
    is(test.pcLocal._pc.canTrickleIceCandidates, true,
       "Local thinks that remote can trickle");
  },

  function PC_LOCAL_WAIT_FOR_ICE_CONNECTED(test) {
    return test.pcLocal.waitForIceConnected()
    .then(() => {
      info(test.pcLocal + ": ICE connection state log: " + test.pcLocal.iceConnectionLog);
    });
  },

  function PC_REMOTE_WAIT_FOR_ICE_CONNECTED(test) {
    return test.pcRemote.waitForIceConnected()
    .then(() => {
      info(test.pcRemote + ": ICE connection state log: " + test.pcRemote.iceConnectionLog);
    });
  },

  function PC_LOCAL_VERIFY_ICE_GATHERING(test) {
    return waitForAnIceCandidate(test.pcLocal);
  },

  function PC_REMOTE_VERIFY_ICE_GATHERING(test) {
    return waitForAnIceCandidate(test.pcRemote);
  },

  function PC_LOCAL_WAIT_FOR_MEDIA_FLOW(test) {
    return test.pcLocal.waitForMediaFlow();
  },

  function PC_REMOTE_WAIT_FOR_MEDIA_FLOW(test) {
    return test.pcRemote.waitForMediaFlow();
  },

  function PC_LOCAL_CHECK_STATS(test) {
    return test.pcLocal.getStats().then(stats => {
      test.pcLocal.checkStats(stats, test.testOptions.steeplechase);
    });
  },

  function PC_REMOTE_CHECK_STATS(test) {
    return test.pcRemote.getStats().then(stats => {
      test.pcRemote.checkStats(stats, test.testOptions.steeplechase);
    });
  },

  function PC_LOCAL_CHECK_ICE_CONNECTION_TYPE(test) {
    return test.pcLocal.getStats().then(stats => {
      test.pcLocal.checkStatsIceConnectionType(stats,
          test.testOptions.expectedLocalCandidateType);
    });
  },

  function PC_REMOTE_CHECK_ICE_CONNECTION_TYPE(test) {
    return test.pcRemote.getStats().then(stats => {
      test.pcRemote.checkStatsIceConnectionType(stats,
          test.testOptions.expectedRemoteCandidateType);
    });
  },

  function PC_LOCAL_CHECK_ICE_CONNECTIONS(test) {
    return test.pcLocal.getStats().then(stats => {
      test.pcLocal.checkStatsIceConnections(stats,
                                            test._offer_constraints,
                                            test._offer_options,
                                            test.testOptions);
    });
  },

  function PC_REMOTE_CHECK_ICE_CONNECTIONS(test) {
    return test.pcRemote.getStats().then(stats => {
      test.pcRemote.checkStatsIceConnections(stats,
                                             test._offer_constraints,
                                             test._offer_options,
                                             test.testOptions);
    });
  },

  function PC_LOCAL_CHECK_MSID(test) {
    return test.pcLocal.checkMsids();
  },
  function PC_REMOTE_CHECK_MSID(test) {
    return test.pcRemote.checkMsids();
  },

  function PC_LOCAL_CHECK_TRACK_STATS(test) {
    return checkAllTrackStats(test.pcLocal);
  },
  function PC_REMOTE_CHECK_TRACK_STATS(test) {
    return checkAllTrackStats(test.pcRemote);
  },
  function PC_LOCAL_VERIFY_SDP_AFTER_END_OF_TRICKLE(test) {
    if (test.pcLocal.endOfTrickleSdp) {
      /* In case the endOfTrickleSdp promise is resolved already it will win the
       * race because it gets evaluated first. But if endOfTrickleSdp is still
       * pending the rejection will win the race. */
      return Promise.race([
        test.pcLocal.endOfTrickleSdp,
        Promise.reject("No SDP")
      ])
      .then(sdp => sdputils.checkSdpAfterEndOfTrickle(sdp, test.testOptions, test.pcLocal.label),
            () => info("pcLocal: Gathering is not complete yet, skipping post-gathering SDP check"));
    }
  },
  function PC_REMOTE_VERIFY_SDP_AFTER_END_OF_TRICKLE(test) {
    if (test.pcRemote.endOfTrickleSdp) {
      /* In case the endOfTrickleSdp promise is resolved already it will win the
       * race because it gets evaluated first. But if endOfTrickleSdp is still
       * pending the rejection will win the race. */
      return Promise.race([
        test.pcRemote.endOfTrickleSdp,
        Promise.reject("No SDP")
      ])
      .then(sdp => sdputils.checkSdpAfterEndOfTrickle(sdp, test.testOptions, test.pcRemote.label),
            () => info("pcRemote: Gathering is not complete yet, skipping post-gathering SDP check"));
    }
  }
];

function PC_LOCAL_REMOVE_ALL_BUT_H264_FROM_OFFER(test) {
  isnot(test.originalOffer.sdp.search("H264/90000"), -1, "H.264 should be present in the SDP offer");
    test.originalOffer.sdp = sdputils.removeCodec(sdputils.removeCodec(sdputils.removeCodec(
	test.originalOffer.sdp, 120), 121, 97));
  info("Updated H264 only offer: " + JSON.stringify(test.originalOffer));
};

function PC_LOCAL_REMOVE_BUNDLE_FROM_OFFER(test) {
  test.originalOffer.sdp = sdputils.removeBundle(test.originalOffer.sdp);
  info("Updated no bundle offer: " + JSON.stringify(test.originalOffer));
};

function PC_LOCAL_REMOVE_RTCPMUX_FROM_OFFER(test) {
  test.originalOffer.sdp = sdputils.removeRtcpMux(test.originalOffer.sdp);
  info("Updated no RTCP-Mux offer: " + JSON.stringify(test.originalOffer));
};

var addRenegotiation = (chain, commands, checks) => {
  chain.append(commands);
  chain.append(commandsPeerConnectionOfferAnswer);
  if (checks) {
    chain.append(checks);
  }
};

var addRenegotiationAnswerer = (chain, commands, checks) => {
  chain.append(function SWAP_PC_LOCAL_PC_REMOTE(test) {
    var temp = test.pcLocal;
    test.pcLocal = test.pcRemote;
    test.pcRemote = temp;
  });
  addRenegotiation(chain, commands, checks);
};
