/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "mozilla/MozPromise.h"
#include "MediaFormatReader.h"
#include "ReaderProxy.h"
#include "TimeUnits.h"

namespace mozilla {

ReaderProxy::ReaderProxy(AbstractThread* aOwnerThread,
                         MediaFormatReader* aReader)
    : mOwnerThread(aOwnerThread),
      mReader(aReader),
      mWatchManager(this, aReader->OwnerThread()),
      mDuration(aReader->OwnerThread(), media::NullableTimeUnit(),
                "ReaderProxy::mDuration (Mirror)") {
  // Must support either heuristic buffering or WaitForData().
  MOZ_ASSERT(mReader->UseBufferingHeuristics() ||
             mReader->IsWaitForDataSupported());
}

ReaderProxy::~ReaderProxy() = default;

media::TimeUnit ReaderProxy::StartTime() const {
  MOZ_ASSERT(mOwnerThread->IsCurrentThreadIn());
  return mStartTime.ref();
}

RefPtr<ReaderProxy::MetadataPromise> ReaderProxy::ReadMetadata() {
  MOZ_ASSERT(mOwnerThread->IsCurrentThreadIn());
  MOZ_ASSERT(!mShutdown);
  return InvokeAsync(mReader->OwnerThread(), mReader.get(), __func__,
                     &MediaFormatReader::AsyncReadMetadata)
      ->Then(mOwnerThread, __func__, this, &ReaderProxy::OnMetadataRead,
             &ReaderProxy::OnMetadataNotRead);
}

RefPtr<ReaderProxy::AudioDataPromise> ReaderProxy::OnAudioDataRequestCompleted(
    RefPtr<AudioData> aAudio) {
  MOZ_ASSERT(mOwnerThread->IsCurrentThreadIn());

  if (aAudio->AdjustForStartTime(StartTime())) {
    return AudioDataPromise::CreateAndResolve(aAudio.forget(), __func__);
  }
  return AudioDataPromise::CreateAndReject(NS_ERROR_DOM_MEDIA_OVERFLOW_ERR,
                                           __func__);
}

RefPtr<ReaderProxy::AudioDataPromise> ReaderProxy::OnAudioDataRequestFailed(
    const MediaResult& aError) {
  MOZ_ASSERT(mOwnerThread->IsCurrentThreadIn());
  return AudioDataPromise::CreateAndReject(aError, __func__);
}

RefPtr<ReaderProxy::AudioDataPromise> ReaderProxy::RequestAudioData() {
  MOZ_ASSERT(mOwnerThread->IsCurrentThreadIn());
  MOZ_ASSERT(!mShutdown);

  return InvokeAsync(mReader->OwnerThread(), mReader.get(), __func__,
                     &MediaFormatReader::RequestAudioData)
      ->Then(mOwnerThread, __func__, this,
             &ReaderProxy::OnAudioDataRequestCompleted,
             &ReaderProxy::OnAudioDataRequestFailed);
}

RefPtr<ReaderProxy::VideoDataPromise> ReaderProxy::RequestVideoData(
    const media::TimeUnit& aTimeThreshold, bool aRequestNextVideoKeyFrame) {
  MOZ_ASSERT(mOwnerThread->IsCurrentThreadIn());
  MOZ_ASSERT(!mShutdown);

  const auto threshold = aTimeThreshold > media::TimeUnit::Zero()
                             ? aTimeThreshold + StartTime()
                             : aTimeThreshold;

  auto startTime = StartTime();
  return InvokeAsync(mReader->OwnerThread(), mReader.get(), __func__,
                     &MediaFormatReader::RequestVideoData, threshold,
                     aRequestNextVideoKeyFrame)
      ->Then(
          mOwnerThread, __func__,
          [startTime](RefPtr<VideoData> aVideo) {
            return aVideo->AdjustForStartTime(startTime)
                       ? VideoDataPromise::CreateAndResolve(aVideo.forget(),
                                                            __func__)
                       : VideoDataPromise::CreateAndReject(
                             NS_ERROR_DOM_MEDIA_OVERFLOW_ERR, __func__);
          },
          [](const MediaResult& aError) {
            return VideoDataPromise::CreateAndReject(aError, __func__);
          });
}

RefPtr<ReaderProxy::SeekPromise> ReaderProxy::Seek(const SeekTarget& aTarget) {
  MOZ_ASSERT(mOwnerThread->IsCurrentThreadIn());
  return SeekInternal(aTarget);
}

RefPtr<ReaderProxy::SeekPromise> ReaderProxy::SeekInternal(
    const SeekTarget& aTarget) {
  MOZ_ASSERT(mOwnerThread->IsCurrentThreadIn());
  SeekTarget adjustedTarget = aTarget;
  adjustedTarget.SetTime(adjustedTarget.GetTime() + StartTime());
  return InvokeAsync(mReader->OwnerThread(), mReader.get(), __func__,
                     &MediaFormatReader::Seek, std::move(adjustedTarget));
}

RefPtr<ReaderProxy::WaitForDataPromise> ReaderProxy::WaitForData(
    MediaData::Type aType) {
  MOZ_ASSERT(mOwnerThread->IsCurrentThreadIn());
  MOZ_ASSERT(mReader->IsWaitForDataSupported());
  return InvokeAsync(mReader->OwnerThread(), mReader.get(), __func__,
                     &MediaFormatReader::WaitForData, aType);
}

void ReaderProxy::ReleaseResources() {
  MOZ_ASSERT(mOwnerThread->IsCurrentThreadIn());
  nsCOMPtr<nsIRunnable> r =
      NewRunnableMethod("MediaFormatReader::ReleaseResources", mReader,
                        &MediaFormatReader::ReleaseResources);
  nsresult rv = mReader->OwnerThread()->Dispatch(r.forget());
  MOZ_DIAGNOSTIC_ASSERT(NS_SUCCEEDED(rv));
  Unused << rv;
}

void ReaderProxy::ResetDecode(TrackSet aTracks) {
  MOZ_ASSERT(mOwnerThread->IsCurrentThreadIn());
  nsCOMPtr<nsIRunnable> r =
      NewRunnableMethod<TrackSet>("MediaFormatReader::ResetDecode", mReader,
                                  &MediaFormatReader::ResetDecode, aTracks);
  nsresult rv = mReader->OwnerThread()->Dispatch(r.forget());
  MOZ_DIAGNOSTIC_ASSERT(NS_SUCCEEDED(rv));
  Unused << rv;
}

RefPtr<ShutdownPromise> ReaderProxy::Shutdown() {
  MOZ_ASSERT(mOwnerThread->IsCurrentThreadIn());
  mShutdown = true;
  RefPtr<ReaderProxy> self = this;
  return InvokeAsync(mReader->OwnerThread(), __func__, [self]() {
    self->mDuration.DisconnectIfConnected();
    self->mWatchManager.Shutdown();
    return self->mReader->Shutdown();
  });
}

RefPtr<ReaderProxy::MetadataPromise> ReaderProxy::OnMetadataRead(
    MetadataHolder&& aMetadata) {
  MOZ_ASSERT(mOwnerThread->IsCurrentThreadIn());
  if (mShutdown) {
    return MetadataPromise::CreateAndReject(NS_ERROR_DOM_MEDIA_ABORT_ERR,
                                            __func__);
  }

  if (mStartTime.isNothing()) {
    mStartTime.emplace(aMetadata.mInfo->mStartTime);
  }
  return MetadataPromise::CreateAndResolve(std::move(aMetadata), __func__);
}

RefPtr<ReaderProxy::MetadataPromise> ReaderProxy::OnMetadataNotRead(
    const MediaResult& aError) {
  return MetadataPromise::CreateAndReject(aError, __func__);
}

void ReaderProxy::SetVideoBlankDecode(bool aIsBlankDecode) {
  MOZ_ASSERT(mOwnerThread->IsCurrentThreadIn());
  nsCOMPtr<nsIRunnable> r = NewRunnableMethod<bool>(
      "MediaFormatReader::SetVideoNullDecode", mReader,
      &MediaFormatReader::SetVideoNullDecode, aIsBlankDecode);
  nsresult rv = mReader->OwnerThread()->Dispatch(r.forget());
  MOZ_DIAGNOSTIC_ASSERT(NS_SUCCEEDED(rv));
  Unused << rv;
}

void ReaderProxy::UpdateDuration() {
  MOZ_ASSERT(mReader->OwnerThread()->IsCurrentThreadIn());
  mReader->UpdateDuration(mDuration.Ref().ref());
}

void ReaderProxy::SetCanonicalDuration(
    AbstractCanonical<media::NullableTimeUnit>* aCanonical) {
  using DurationT = AbstractCanonical<media::NullableTimeUnit>;
  RefPtr<ReaderProxy> self = this;
  RefPtr<DurationT> canonical = aCanonical;
  nsCOMPtr<nsIRunnable> r = NS_NewRunnableFunction(
      "ReaderProxy::SetCanonicalDuration", [this, self, canonical]() {
        mDuration.Connect(canonical);
        mWatchManager.Watch(mDuration, &ReaderProxy::UpdateDuration);
      });
  nsresult rv = mReader->OwnerThread()->Dispatch(r.forget());
  MOZ_DIAGNOSTIC_ASSERT(NS_SUCCEEDED(rv));
  Unused << rv;
}

}  // namespace mozilla