/* -*- 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/. */

#ifndef mozilla_SourceBufferAttributes_h_
#define mozilla_SourceBufferAttributes_h_

#include "TimeUnits.h"
#include "mozilla/dom/SourceBufferBinding.h"
#include "mozilla/Maybe.h"

namespace mozilla {

class SourceBufferAttributes {
 public:
  // Current state as per Segment Parser Loop Algorithm
  // http://w3c.github.io/media-source/index.html#sourcebuffer-segment-parser-loop
  enum class AppendState {
    WAITING_FOR_SEGMENT,
    PARSING_INIT_SEGMENT,
    PARSING_MEDIA_SEGMENT,
  };

  explicit SourceBufferAttributes(bool aGenerateTimestamp)
      : mGenerateTimestamps(aGenerateTimestamp),
        mAppendWindowStart(0),
        mAppendWindowEnd(PositiveInfinity<double>()),
        mAppendMode(dom::SourceBufferAppendMode::Segments),
        mApparentTimestampOffset(0),
        mAppendState(AppendState::WAITING_FOR_SEGMENT) {}

  SourceBufferAttributes(const SourceBufferAttributes& aOther) = default;

  double GetAppendWindowStart() const { return mAppendWindowStart; }

  double GetAppendWindowEnd() const { return mAppendWindowEnd; }

  void SetAppendWindowStart(double aWindowStart) {
    mAppendWindowStart = aWindowStart;
  }

  void SetAppendWindowEnd(double aWindowEnd) { mAppendWindowEnd = aWindowEnd; }

  double GetApparentTimestampOffset() const { return mApparentTimestampOffset; }

  void SetApparentTimestampOffset(double aTimestampOffset) {
    mApparentTimestampOffset = aTimestampOffset;
    mTimestampOffset = media::TimeUnit::FromSeconds(aTimestampOffset);
  }

  media::TimeUnit GetTimestampOffset() const { return mTimestampOffset; }

  void SetTimestampOffset(const media::TimeUnit& aTimestampOffset) {
    mTimestampOffset = aTimestampOffset;
    mApparentTimestampOffset = aTimestampOffset.ToSeconds();
  }

  dom::SourceBufferAppendMode GetAppendMode() const { return mAppendMode; }

  void SetAppendMode(dom::SourceBufferAppendMode aAppendMode) {
    mAppendMode = aAppendMode;
  }

  void SetGroupStartTimestamp(const media::TimeUnit& aGroupStartTimestamp) {
    mGroupStartTimestamp = Some(aGroupStartTimestamp);
  }

  media::TimeUnit GetGroupStartTimestamp() const {
    return mGroupStartTimestamp.ref();
  }

  bool HaveGroupStartTimestamp() const { return mGroupStartTimestamp.isSome(); }

  void ResetGroupStartTimestamp() { mGroupStartTimestamp.reset(); }

  void RestartGroupStartTimestamp() {
    mGroupStartTimestamp = Some(mGroupEndTimestamp);
  }

  media::TimeUnit GetGroupEndTimestamp() const { return mGroupEndTimestamp; }

  void SetGroupEndTimestamp(const media::TimeUnit& aGroupEndTimestamp) {
    mGroupEndTimestamp = aGroupEndTimestamp;
  }

  AppendState GetAppendState() const { return mAppendState; }

  void SetAppendState(AppendState aState) { mAppendState = aState; }

  // mGenerateTimestamp isn't mutable once the source buffer has been
  // constructed
  bool mGenerateTimestamps;

  SourceBufferAttributes& operator=(const SourceBufferAttributes& aOther) =
      default;

 private:
  SourceBufferAttributes() = delete;

  double mAppendWindowStart;
  double mAppendWindowEnd;
  dom::SourceBufferAppendMode mAppendMode;
  double mApparentTimestampOffset;
  media::TimeUnit mTimestampOffset;
  Maybe<media::TimeUnit> mGroupStartTimestamp;
  media::TimeUnit mGroupEndTimestamp;
  // The current append state as per
  // https://w3c.github.io/media-source/#sourcebuffer-append-state
  AppendState mAppendState;
};

}  // end namespace mozilla

#endif /* mozilla_SourceBufferAttributes_h_ */