/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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_dom_AnimationEffectReadOnly_h
#define mozilla_dom_AnimationEffectReadOnly_h

#include "mozilla/ComputedTiming.h"
#include "mozilla/dom/AnimationEffectTimingReadOnly.h"
#include "mozilla/dom/BindingDeclarations.h"
#include "mozilla/dom/Nullable.h"
#include "mozilla/Maybe.h"
#include "mozilla/StickyTimeDuration.h"
#include "mozilla/TimeStamp.h"
#include "mozilla/TimingParams.h"
#include "nsCycleCollectionParticipant.h"
#include "nsWrapperCache.h"

namespace mozilla {

struct ElementPropertyTransition;

namespace dom {

class Animation;
class AnimationEffectTimingReadOnly;
class KeyframeEffectReadOnly;
struct ComputedTimingProperties;

class AnimationEffectReadOnly : public nsISupports,
                                public nsWrapperCache
{
public:
  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(AnimationEffectReadOnly)

  AnimationEffectReadOnly(nsIDocument* aDocument,
                          AnimationEffectTimingReadOnly* aTiming);

  virtual KeyframeEffectReadOnly* AsKeyframeEffect() { return nullptr; }

  virtual ElementPropertyTransition* AsTransition() { return nullptr; }
  virtual const ElementPropertyTransition* AsTransition() const
  {
    return nullptr;
  }

  nsISupports* GetParentObject() const { return mDocument; }

  bool IsCurrent() const;
  bool IsInEffect() const;
  bool IsActiveDurationZero() const
  {
    return SpecifiedTiming().ActiveDuration() == StickyTimeDuration();
  }

  already_AddRefed<AnimationEffectTimingReadOnly> Timing();
  const TimingParams& SpecifiedTiming() const
  {
    return mTiming->AsTimingParams();
  }
  void SetSpecifiedTiming(const TimingParams& aTiming);

  // This function takes as input the timing parameters of an animation and
  // returns the computed timing at the specified local time.
  //
  // The local time may be null in which case only static parameters such as the
  // active duration are calculated. All other members of the returned object
  // are given a null/initial value.
  //
  // This function returns a null mProgress member of the return value
  // if the animation should not be run
  // (because it is not currently active and is not filling at this time).
  static ComputedTiming
  GetComputedTimingAt(const Nullable<TimeDuration>& aLocalTime,
                      const TimingParams& aTiming,
                      double aPlaybackRate);
  // Shortcut that gets the computed timing using the current local time as
  // calculated from the timeline time.
  ComputedTiming GetComputedTiming(const TimingParams* aTiming = nullptr) const;
  void GetComputedTimingAsDict(ComputedTimingProperties& aRetVal) const;

  virtual void SetAnimation(Animation* aAnimation) = 0;
  Animation* GetAnimation() const { return mAnimation; };

protected:
  virtual ~AnimationEffectReadOnly();

  Nullable<TimeDuration> GetLocalTime() const;

protected:
  RefPtr<nsIDocument> mDocument;
  RefPtr<AnimationEffectTimingReadOnly> mTiming;
  RefPtr<Animation> mAnimation;
};

} // namespace dom
} // namespace mozilla

#endif // mozilla_dom_AnimationEffectReadOnly_h