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/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "MediaStreamGraphImpl.h"
#include "MediaStreamListener.h"
#include "mozilla/MathAlgorithms.h"
#include "mozilla/Unused.h"

#include "AudioSegment.h"
#include "VideoSegment.h"
#include "nsContentUtils.h"
#include "nsIAppShell.h"
#include "nsIObserver.h"
#include "nsPrintfCString.h"
#include "nsServiceManagerUtils.h"
#include "nsWidgetsCID.h"
#include "prerror.h"
#include "mozilla/Logging.h"
#include "mozilla/Attributes.h"
#include "TrackUnionStream.h"
#include "ImageContainer.h"
#include "AudioChannelService.h"
#include "AudioNodeEngine.h"
#include "AudioNodeStream.h"
#include "AudioNodeExternalInputStream.h"
#include "webaudio/MediaStreamAudioDestinationNode.h"
#include <algorithm>
#include "DOMMediaStream.h"
#include "GeckoProfiler.h"

using namespace mozilla::layers;
using namespace mozilla::dom;
using namespace mozilla::gfx;

namespace mozilla {

#ifdef STREAM_LOG
#undef STREAM_LOG
#endif

LazyLogModule gTrackUnionStreamLog("TrackUnionStream");
#define STREAM_LOG(type, msg) MOZ_LOG(gTrackUnionStreamLog, type, msg)

TrackUnionStream::TrackUnionStream()
    : ProcessedMediaStream(), mNextAvailableTrackID(1) {}

void TrackUnionStream::RemoveInput(MediaInputPort* aPort) {
  STREAM_LOG(LogLevel::Debug,
             ("TrackUnionStream %p removing input %p", this, aPort));
  for (int32_t i = mTrackMap.Length() - 1; i >= 0; --i) {
    if (mTrackMap[i].mInputPort == aPort) {
      STREAM_LOG(LogLevel::Debug,
                 ("TrackUnionStream %p removing trackmap entry %d", this, i));
      nsTArray<RefPtr<DirectMediaStreamTrackListener>> listeners(
          mTrackMap[i].mOwnedDirectListeners);
      for (auto listener : listeners) {
        // Remove listeners while the entry still exists.
        RemoveDirectTrackListenerImpl(listener, mTrackMap[i].mOutputTrackID);
      }
      EndTrack(i);
      mTrackMap.RemoveElementAt(i);
    }
  }
  ProcessedMediaStream::RemoveInput(aPort);
}
void TrackUnionStream::ProcessInput(GraphTime aFrom, GraphTime aTo,
                                    uint32_t aFlags) {
  if (IsFinishedOnGraphThread()) {
    return;
  }
  AutoTArray<bool, 8> mappedTracksFinished;
  AutoTArray<bool, 8> mappedTracksWithMatchingInputTracks;
  for (uint32_t i = 0; i < mTrackMap.Length(); ++i) {
    mappedTracksFinished.AppendElement(true);
    mappedTracksWithMatchingInputTracks.AppendElement(false);
  }

  AutoTArray<MediaInputPort*, 32> inputs(mInputs);
  inputs.AppendElements(mSuspendedInputs);

  bool allFinished = !inputs.IsEmpty();
  bool allHaveCurrentData = !inputs.IsEmpty();
  for (uint32_t i = 0; i < inputs.Length(); ++i) {
    MediaStream* stream = inputs[i]->GetSource();
    if (!stream->IsFinishedOnGraphThread()) {
      // XXX we really should check whether 'stream' has finished within time
      // aTo, not just that it's finishing when all its queued data eventually
      // runs out.
      allFinished = false;
    }
    if (!stream->HasCurrentData()) {
      allHaveCurrentData = false;
    }
    bool trackAdded = false;
    for (StreamTracks::TrackIter tracks(stream->GetStreamTracks());
         !tracks.IsEnded(); tracks.Next()) {
      bool found = false;
      for (uint32_t j = 0; j < mTrackMap.Length(); ++j) {
        TrackMapEntry* map = &mTrackMap[j];
        if (map->mInputPort == inputs[i] &&
            map->mInputTrackID == tracks->GetID()) {
          bool trackFinished = false;
          StreamTracks::Track* outputTrack =
              mTracks.FindTrack(map->mOutputTrackID);
          found = true;
          if (!outputTrack || outputTrack->IsEnded() ||
              !inputs[i]->PassTrackThrough(tracks->GetID())) {
            trackFinished = true;
          } else {
            CopyTrackData(tracks.get(), j, aFrom, aTo, &trackFinished);
          }
          mappedTracksFinished[j] = trackFinished;
          mappedTracksWithMatchingInputTracks[j] = true;
          break;
        }
      }
      if (!found && inputs[i]->AllowCreationOf(tracks->GetID())) {
        bool trackFinished = false;
        trackAdded = true;
        uint32_t mapIndex = AddTrack(inputs[i], tracks.get(), aFrom);
        CopyTrackData(tracks.get(), mapIndex, aFrom, aTo, &trackFinished);
        mappedTracksFinished.AppendElement(trackFinished);
        mappedTracksWithMatchingInputTracks.AppendElement(true);
      }
    }
    if (trackAdded) {
      for (MediaStreamListener* l : mListeners) {
        l->NotifyFinishedTrackCreation(Graph());
      }
    }
  }
  for (int32_t i = mTrackMap.Length() - 1; i >= 0; --i) {
    if (mappedTracksFinished[i]) {
      EndTrack(i);
    } else {
      allFinished = false;
    }
    if (!mappedTracksWithMatchingInputTracks[i]) {
      for (auto listener : mTrackMap[i].mOwnedDirectListeners) {
        // Remove listeners while the entry still exists.
        RemoveDirectTrackListenerImpl(listener, mTrackMap[i].mOutputTrackID);
      }
      mTrackMap.RemoveElementAt(i);
    }
  }
  if (allFinished && mAutofinish && (aFlags & ALLOW_FINISH)) {
    // All streams have finished and won't add any more tracks, and
    // all our tracks have actually finished and been removed from our map,
    // so we're finished now.
    FinishOnGraphThread();
  } else {
    mTracks.AdvanceKnownTracksTime(GraphTimeToStreamTimeWithBlocking(aTo));
  }
  if (allHaveCurrentData) {
    // We can make progress if we're not blocked
    mHasCurrentData = true;
  }
}

uint32_t TrackUnionStream::AddTrack(MediaInputPort* aPort,
                                    StreamTracks::Track* aTrack,
                                    GraphTime aFrom) {
  STREAM_LOG(LogLevel::Verbose,
             ("TrackUnionStream %p adding track %d for "
              "input stream %p track %d, desired id %d",
              this, aTrack->GetID(), aPort->GetSource(), aTrack->GetID(),
              aPort->GetDestinationTrackId()));

  TrackID id;
  if (IsTrackIDExplicit(id = aPort->GetDestinationTrackId())) {
    MOZ_ASSERT(id >= mNextAvailableTrackID && !mUsedTracks.ContainsSorted(id),
               "Desired destination id taken. Only provide a destination ID "
               "if you can assure its availability, or we may not be able "
               "to bind to the correct DOM-side track.");
#ifdef DEBUG
    AutoTArray<MediaInputPort*, 32> inputs(mInputs);
    inputs.AppendElements(mSuspendedInputs);
    for (size_t i = 0; inputs[i] != aPort; ++i) {
      MOZ_ASSERT(inputs[i]->GetSourceTrackId() != TRACK_ANY,
                 "You are adding a MediaInputPort with a track mapping "
                 "while there already exist generic MediaInputPorts for this "
                 "destination stream. This can lead to TrackID collisions!");
    }
#endif
    mUsedTracks.InsertElementSorted(id);
  } else if ((id = aTrack->GetID()) && id > mNextAvailableTrackID &&
             !mUsedTracks.ContainsSorted(id)) {
    // Input id available. Mark it used in mUsedTracks.
    mUsedTracks.InsertElementSorted(id);
  } else {
    // No desired destination id and Input id taken, allocate a new one.
    id = mNextAvailableTrackID;

    // Update mNextAvailableTrackID and prune any mUsedTracks members it now
    // covers.
    while (1) {
      if (!mUsedTracks.RemoveElementSorted(++mNextAvailableTrackID)) {
        // Not in use. We're done.
        break;
      }
    }
  }

  // Round up the track start time so the track, if anything, starts a
  // little later than the true time. This means we'll have enough
  // samples in our input stream to go just beyond the destination time.
  StreamTime outputStart = GraphTimeToStreamTimeWithBlocking(aFrom);

  nsAutoPtr<MediaSegment> segment;
  segment = aTrack->GetSegment()->CreateEmptyClone();
  for (uint32_t j = 0; j < mListeners.Length(); ++j) {
    MediaStreamListener* l = mListeners[j];
    l->NotifyQueuedTrackChanges(Graph(), id, outputStart,
                                TrackEventCommand::TRACK_EVENT_CREATED,
                                *segment, aPort->GetSource(), aTrack->GetID());
  }
  segment->AppendNullData(outputStart);
  StreamTracks::Track* track =
      &mTracks.AddTrack(id, outputStart, segment.forget());
  STREAM_LOG(LogLevel::Debug, ("TrackUnionStream %p added track %d for input "
                               "stream %p track %d, start ticks %lld",
                               this, track->GetID(), aPort->GetSource(),
                               aTrack->GetID(), (long long)outputStart));

  TrackMapEntry* map = mTrackMap.AppendElement();
  map->mEndOfConsumedInputTicks = 0;
  map->mEndOfLastInputIntervalInInputStream = -1;
  map->mEndOfLastInputIntervalInOutputStream = -1;
  map->mInputPort = aPort;
  map->mInputTrackID = aTrack->GetID();
  map->mOutputTrackID = track->GetID();
  map->mSegment = aTrack->GetSegment()->CreateEmptyClone();

  for (int32_t i = mPendingDirectTrackListeners.Length() - 1; i >= 0; --i) {
    TrackBound<DirectMediaStreamTrackListener>& bound =
        mPendingDirectTrackListeners[i];
    if (bound.mTrackID != map->mOutputTrackID) {
      continue;
    }
    MediaStream* source = map->mInputPort->GetSource();
    map->mOwnedDirectListeners.AppendElement(bound.mListener);
    DisabledTrackMode currentMode = GetDisabledTrackMode(bound.mTrackID);
    if (currentMode != DisabledTrackMode::ENABLED) {
      bound.mListener->IncreaseDisabled(currentMode);
    }
    STREAM_LOG(LogLevel::Debug, ("TrackUnionStream %p adding direct listener "
                                 "%p for track %d. Forwarding to input "
                                 "stream %p track %d.",
                                 this, bound.mListener.get(), bound.mTrackID,
                                 source, map->mInputTrackID));
    source->AddDirectTrackListenerImpl(bound.mListener.forget(),
                                       map->mInputTrackID);
    mPendingDirectTrackListeners.RemoveElementAt(i);
  }

  return mTrackMap.Length() - 1;
}

void TrackUnionStream::EndTrack(uint32_t aIndex) {
  StreamTracks::Track* outputTrack =
      mTracks.FindTrack(mTrackMap[aIndex].mOutputTrackID);
  if (!outputTrack || outputTrack->IsEnded()) return;
  STREAM_LOG(LogLevel::Debug, ("TrackUnionStream %p ending track %d", this,
                               outputTrack->GetID()));
  for (uint32_t j = 0; j < mListeners.Length(); ++j) {
    MediaStreamListener* l = mListeners[j];
    StreamTime offset = outputTrack->GetSegment()->GetDuration();
    nsAutoPtr<MediaSegment> segment;
    segment = outputTrack->GetSegment()->CreateEmptyClone();
    l->NotifyQueuedTrackChanges(Graph(), outputTrack->GetID(), offset,
                                TrackEventCommand::TRACK_EVENT_ENDED, *segment,
                                mTrackMap[aIndex].mInputPort->GetSource(),
                                mTrackMap[aIndex].mInputTrackID);
  }
  for (TrackBound<MediaStreamTrackListener>& b : mTrackListeners) {
    if (b.mTrackID == outputTrack->GetID()) {
      b.mListener->NotifyEnded();
    }
  }
  outputTrack->SetEnded();
}

void TrackUnionStream::CopyTrackData(StreamTracks::Track* aInputTrack,
                                     uint32_t aMapIndex, GraphTime aFrom,
                                     GraphTime aTo,
                                     bool* aOutputTrackFinished) {
  TrackMapEntry* map = &mTrackMap[aMapIndex];
  StreamTracks::Track* outputTrack = mTracks.FindTrack(map->mOutputTrackID);
  MOZ_ASSERT(outputTrack && !outputTrack->IsEnded(),
             "Can't copy to ended track");

  MediaSegment* segment = map->mSegment;
  MediaStream* source = map->mInputPort->GetSource();

  GraphTime next;
  *aOutputTrackFinished = false;
  for (GraphTime t = aFrom; t < aTo; t = next) {
    MediaInputPort::InputInterval interval =
        map->mInputPort->GetNextInputInterval(t);
    interval.mEnd = std::min(interval.mEnd, aTo);
    StreamTime inputEnd =
        source->GraphTimeToStreamTimeWithBlocking(interval.mEnd);
    StreamTime inputTrackEndPoint = STREAM_TIME_MAX;

    if (aInputTrack->IsEnded() && aInputTrack->GetEnd() <= inputEnd) {
      inputTrackEndPoint = aInputTrack->GetEnd();
      *aOutputTrackFinished = true;
      break;
    }

    if (interval.mStart >= interval.mEnd) {
      break;
    }
    StreamTime ticks = interval.mEnd - interval.mStart;
    next = interval.mEnd;

    StreamTime outputStart = outputTrack->GetEnd();

    if (interval.mInputIsBlocked) {
      segment->AppendNullData(ticks);
      STREAM_LOG(
          LogLevel::Verbose,
          ("TrackUnionStream %p appending %lld ticks of null data to track %d",
           this, (long long)ticks, outputTrack->GetID()));
    } else if (InMutedCycle()) {
      segment->AppendNullData(ticks);
    } else {
      if (source->IsSuspended()) {
        segment->AppendNullData(aTo - aFrom);
      } else {
        MOZ_ASSERT(outputTrack->GetEnd() ==
                       GraphTimeToStreamTimeWithBlocking(interval.mStart),
                   "Samples missing");
        StreamTime inputStart =
            source->GraphTimeToStreamTimeWithBlocking(interval.mStart);
        segment->AppendSlice(*aInputTrack->GetSegment(),
                             std::min(inputTrackEndPoint, inputStart),
                             std::min(inputTrackEndPoint, inputEnd));
      }
    }
    ApplyTrackDisabling(outputTrack->GetID(), segment);
    for (uint32_t j = 0; j < mListeners.Length(); ++j) {
      MediaStreamListener* l = mListeners[j];
      // Separate Audio and Video.
      if (segment->GetType() == MediaSegment::AUDIO) {
        l->NotifyQueuedAudioData(Graph(), outputTrack->GetID(), outputStart,
                                 *static_cast<AudioSegment*>(segment),
                                 map->mInputPort->GetSource(),
                                 map->mInputTrackID);
      }
    }
    for (TrackBound<MediaStreamTrackListener>& b : mTrackListeners) {
      if (b.mTrackID != outputTrack->GetID()) {
        continue;
      }
      b.mListener->NotifyQueuedChanges(Graph(), outputStart, *segment);
    }
    outputTrack->GetSegment()->AppendFrom(segment);
  }
}

void TrackUnionStream::SetTrackEnabledImpl(TrackID aTrackID,
                                           DisabledTrackMode aMode) {
  bool enabled = aMode == DisabledTrackMode::ENABLED;
  for (TrackMapEntry& entry : mTrackMap) {
    if (entry.mOutputTrackID == aTrackID) {
      STREAM_LOG(LogLevel::Info,
                 ("TrackUnionStream %p track %d was explicitly %s", this,
                  aTrackID, enabled ? "enabled" : "disabled"));
      for (DirectMediaStreamTrackListener* listener :
           entry.mOwnedDirectListeners) {
        DisabledTrackMode oldMode = GetDisabledTrackMode(aTrackID);
        bool oldEnabled = oldMode == DisabledTrackMode::ENABLED;
        if (!oldEnabled && enabled) {
          STREAM_LOG(LogLevel::Debug, ("TrackUnionStream %p track %d setting "
                                       "direct listener enabled",
                                       this, aTrackID));
          listener->DecreaseDisabled(oldMode);
        } else if (oldEnabled && !enabled) {
          STREAM_LOG(LogLevel::Debug, ("TrackUnionStream %p track %d setting "
                                       "direct listener disabled",
                                       this, aTrackID));
          listener->IncreaseDisabled(aMode);
        }
      }
    }
  }
  MediaStream::SetTrackEnabledImpl(aTrackID, aMode);
}

MediaStream* TrackUnionStream::GetInputStreamFor(TrackID aTrackID) {
  for (TrackMapEntry& entry : mTrackMap) {
    if (entry.mOutputTrackID == aTrackID && entry.mInputPort) {
      return entry.mInputPort->GetSource();
    }
  }

  return nullptr;
}

TrackID TrackUnionStream::GetInputTrackIDFor(TrackID aTrackID) {
  for (TrackMapEntry& entry : mTrackMap) {
    if (entry.mOutputTrackID == aTrackID) {
      return entry.mInputTrackID;
    }
  }

  return TRACK_NONE;
}

void TrackUnionStream::AddDirectTrackListenerImpl(
    already_AddRefed<DirectMediaStreamTrackListener> aListener,
    TrackID aTrackID) {
  RefPtr<DirectMediaStreamTrackListener> listener = aListener;

  for (TrackMapEntry& entry : mTrackMap) {
    if (entry.mOutputTrackID == aTrackID) {
      MediaStream* source = entry.mInputPort->GetSource();
      STREAM_LOG(LogLevel::Debug,
                 ("TrackUnionStream %p adding direct listener "
                  "%p for track %d. Forwarding to input "
                  "stream %p track %d.",
                  this, listener.get(), aTrackID, source, entry.mInputTrackID));
      entry.mOwnedDirectListeners.AppendElement(listener);
      DisabledTrackMode currentMode = GetDisabledTrackMode(aTrackID);
      if (currentMode != DisabledTrackMode::ENABLED) {
        listener->IncreaseDisabled(currentMode);
      }
      source->AddDirectTrackListenerImpl(listener.forget(),
                                         entry.mInputTrackID);
      return;
    }
  }

  TrackBound<DirectMediaStreamTrackListener>* bound =
      mPendingDirectTrackListeners.AppendElement();
  bound->mListener = listener.forget();
  bound->mTrackID = aTrackID;
}

void TrackUnionStream::RemoveDirectTrackListenerImpl(
    DirectMediaStreamTrackListener* aListener, TrackID aTrackID) {
  for (TrackMapEntry& entry : mTrackMap) {
    // OutputTrackID is unique to this stream so we only need to do this once.
    if (entry.mOutputTrackID != aTrackID) {
      continue;
    }
    for (size_t i = 0; i < entry.mOwnedDirectListeners.Length(); ++i) {
      if (entry.mOwnedDirectListeners[i] == aListener) {
        STREAM_LOG(LogLevel::Debug,
                   ("TrackUnionStream %p removing direct "
                    "listener %p for track %d, forwarding "
                    "to input stream %p track %d",
                    this, aListener, aTrackID, entry.mInputPort->GetSource(),
                    entry.mInputTrackID));
        DisabledTrackMode currentMode = GetDisabledTrackMode(aTrackID);
        if (currentMode != DisabledTrackMode::ENABLED) {
          // Reset the listener's state.
          aListener->DecreaseDisabled(currentMode);
        }
        entry.mOwnedDirectListeners.RemoveElementAt(i);
        break;
      }
    }
    // Forward to the input
    MediaStream* source = entry.mInputPort->GetSource();
    source->RemoveDirectTrackListenerImpl(aListener, entry.mInputTrackID);
    return;
  }

  for (size_t i = 0; i < mPendingDirectTrackListeners.Length(); ++i) {
    TrackBound<DirectMediaStreamTrackListener>& bound =
        mPendingDirectTrackListeners[i];
    if (bound.mListener == aListener && bound.mTrackID == aTrackID) {
      mPendingDirectTrackListeners.RemoveElementAt(i);
      return;
    }
  }
}

void TrackUnionStream::RemoveAllDirectListenersImpl() {
  for (TrackMapEntry& entry : mTrackMap) {
    nsTArray<RefPtr<DirectMediaStreamTrackListener>> listeners(
        entry.mOwnedDirectListeners);
    for (const auto& listener : listeners) {
      RemoveDirectTrackListenerImpl(listener, entry.mOutputTrackID);
    }
    MOZ_DIAGNOSTIC_ASSERT(entry.mOwnedDirectListeners.IsEmpty());
  }

  nsTArray<TrackBound<DirectMediaStreamTrackListener>> boundListeners(
      mPendingDirectTrackListeners);
  for (const auto& binding : boundListeners) {
    RemoveDirectTrackListenerImpl(binding.mListener, binding.mTrackID);
  }
  MOZ_DIAGNOSTIC_ASSERT(mPendingDirectTrackListeners.IsEmpty());
}

}  // namespace mozilla