/* 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/. */

/* Utilities for animation of computed style values */

#ifndef mozilla_StyleAnimationValue_h_
#define mozilla_StyleAnimationValue_h_

#include "NonCustomCSSPropertyId.h"
#include "mozilla/CSSPropertyId.h"
#include "mozilla/RefPtr.h"
#include "mozilla/ServoStyleConsts.h"
#include "mozilla/gfx/Matrix.h"
#include "nsColor.h"
#include "nsStringFwd.h"

class nsIFrame;

namespace mozilla {

namespace css {
class StyleRule;
}  // namespace css

namespace dom {
class Element;
}  // namespace dom

namespace layers {
class Animatable;
}  // namespace layers

enum class PseudoStyleType : uint8_t;
struct PropertyStyleAnimationValuePair;
struct StyleAnimationValue;
struct StylePerDocumentStyleData;

struct AnimationValue {
  explicit AnimationValue(const RefPtr<StyleAnimationValue>& aValue)
      : mServo(aValue) {}
  AnimationValue() = default;

  AnimationValue(const AnimationValue& aOther) = default;
  AnimationValue(AnimationValue&& aOther) = default;

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

  bool operator==(const AnimationValue& aOther) const;
  bool operator!=(const AnimationValue& aOther) const;

  bool IsNull() const { return !mServo; }

  float GetOpacity() const;

  // Returns nscolor value in this AnimationValue.
  // Currently only background-color is supported.
  nscolor GetColor(nscolor aForegroundColor) const;

  // Returns true if this AnimationValue is current-color.
  // Currently only background-color is supported.
  bool IsCurrentColor() const;

  // Return a transform list for the transform property.
  const mozilla::StyleTransform& GetTransformProperty() const;
  const mozilla::StyleScale& GetScaleProperty() const;
  const mozilla::StyleTranslate& GetTranslateProperty() const;
  const mozilla::StyleRotate& GetRotateProperty() const;

  // Motion path properties.
  // Note: This clones the StyleOffsetPath object from its AnimatedValue, so
  // this may be expensive if the path is a complex SVG path or polygon. The
  // caller should be aware of this performance impact.
  void GetOffsetPathProperty(StyleOffsetPath& aOffsetPath) const;
  const mozilla::LengthPercentage& GetOffsetDistanceProperty() const;
  const mozilla::StyleOffsetRotate& GetOffsetRotateProperty() const;
  const mozilla::StylePositionOrAuto& GetOffsetAnchorProperty() const;
  const mozilla::StyleOffsetPosition& GetOffsetPositionProperty() const;
  bool IsOffsetPathUrl() const;

  // Return the scale for mServo, which is calculated with reference to aFrame.
  mozilla::gfx::MatrixScales GetScaleValue(const nsIFrame* aFrame) const;

  // Uncompute this AnimationValue and then serialize it.
  void SerializeSpecifiedValue(const CSSPropertyId& aProperty,
                               const StylePerDocumentStyleData* aRawData,
                               nsACString& aString) const;

  // Check if |*this| and |aToValue| can be interpolated.
  bool IsInterpolableWith(const CSSPropertyId& aProperty,
                          const AnimationValue& aToValue) const;

  // Compute the distance between *this and aOther.
  double ComputeDistance(const AnimationValue& aOther) const;

  // Create an AnimaitonValue from a string. This method flushes style, so we
  // should use this carefully. Now, it is only used by
  // nsDOMWindowUtils::ComputeAnimationDistance.
  static AnimationValue FromString(CSSPropertyId& aProperty,
                                   const nsACString& aValue,
                                   dom::Element* aElement);

  // Create an already_AddRefed<StyleAnimationValue> from a
  // layers::Animatable. Basically, this function should return AnimationValue,
  // but it seems the caller, AnimationHelper, only needs
  // StyleAnimationValue, so we return its already_AddRefed<> to avoid
  // adding/removing a redundant ref-count.
  static already_AddRefed<StyleAnimationValue> FromAnimatable(
      NonCustomCSSPropertyId aProperty, const layers::Animatable& aAnimatable);

  RefPtr<StyleAnimationValue> mServo;
};

std::ostream& operator<<(std::ostream& aOut, const AnimationValue& aValue);

struct PropertyStyleAnimationValuePair {
  CSSPropertyId mProperty;
  AnimationValue mValue;
};
}  // namespace mozilla

#endif