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#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_ANIMATION_INERT_EFFECT_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_ANIMATION_INERT_EFFECT_H_

#include "third_party/blink/renderer/core/animation/animation_effect.h"
#include "third_party/blink/renderer/core/animation/keyframe_effect_model.h"
#include "third_party/blink/renderer/core/core_export.h"

namespace blink {

// Lightweight subset of KeyframeEffect.
// Used to transport data for deferred KeyframeEffect construction and one off
// Interpolation sampling.
class CORE_EXPORT InertEffect final : public AnimationEffect {
 public:
  InertEffect(KeyframeEffectModelBase*,
              const Timing&,
              bool paused,
              base::Optional<double> inherited_time,
              base::Optional<TimelinePhase> inherited_phase);

  void Sample(HeapVector<Member<Interpolation>>&) const;
  KeyframeEffectModelBase* Model() const { return model_.Get(); }
  bool Paused() const { return paused_; }

  bool IsInertEffect() const final { return true; }

  void Trace(Visitor*) const override;

 protected:
  void UpdateChildrenAndEffects() const override {}
  AnimationTimeDelta CalculateTimeToEffectChange(
      bool forwards,
      base::Optional<double> inherited_time,
      AnimationTimeDelta time_to_next_iteration) const override;

 private:
  Member<KeyframeEffectModelBase> model_;
  bool paused_;
  base::Optional<double> inherited_time_;
  base::Optional<TimelinePhase> inherited_phase_;
};

template <>
struct DowncastTraits<InertEffect> {
  static bool AllowFrom(const AnimationEffect& animationEffect) {
    return animationEffect.IsInertEffect();
  }
};

}  // namespace blink

#endif