/*
 * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above
 *    copyright notice, this list of conditions and the following
 *    disclaimer.
 * 2. Redistributions in binary form must reproduce the above
 *    copyright notice, this list of conditions and the following
 *    disclaimer in the documentation and/or other materials
 *    provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef BasicShapes_h
#define BasicShapes_h

#include "core/CoreExport.h"
#include "core/style/ComputedStyleConstants.h"
#include "platform/Length.h"
#include "platform/LengthSize.h"
#include "platform/graphics/GraphicsTypes.h"
#include "wtf/Allocator.h"
#include "wtf/RefCounted.h"
#include "wtf/RefPtr.h"
#include "wtf/Vector.h"

namespace blink {

class FloatRect;
class FloatSize;
class Path;

class CORE_EXPORT BasicShape : public RefCounted<BasicShape> {
 public:
  virtual ~BasicShape() {}

  enum ShapeType {
    BasicShapeEllipseType,
    BasicShapePolygonType,
    BasicShapeCircleType,
    BasicShapeInsetType
  };

  bool canBlend(const BasicShape*) const;
  bool isSameType(const BasicShape& other) const {
    return type() == other.type();
  }

  virtual void path(Path&, const FloatRect&) = 0;
  virtual WindRule getWindRule() const { return RULE_NONZERO; }
  virtual PassRefPtr<BasicShape> blend(const BasicShape*, double) const = 0;
  virtual bool operator==(const BasicShape&) const = 0;

  virtual ShapeType type() const = 0;

 protected:
  BasicShape() {}
};

#define DEFINE_BASICSHAPE_TYPE_CASTS(thisType)                   \
  DEFINE_TYPE_CASTS(thisType, BasicShape, value,                 \
                    value->type() == BasicShape::thisType##Type, \
                    value.type() == BasicShape::thisType##Type)

class BasicShapeCenterCoordinate {
  DISALLOW_NEW();

 public:
  enum Direction { TopLeft, BottomRight };

  BasicShapeCenterCoordinate(Direction direction = TopLeft,
                             const Length& length = Length(0, Fixed))
      : m_direction(direction),
        m_length(length),
        m_computedLength(direction == TopLeft
                             ? length
                             : length.subtractFromOneHundredPercent()) {}

  BasicShapeCenterCoordinate(const BasicShapeCenterCoordinate& other)
      : m_direction(other.getDirection()),
        m_length(other.length()),
        m_computedLength(other.m_computedLength) {}

  bool operator==(const BasicShapeCenterCoordinate& other) const {
    return m_direction == other.m_direction && m_length == other.m_length &&
           m_computedLength == other.m_computedLength;
  }

  Direction getDirection() const { return m_direction; }
  const Length& length() const { return m_length; }
  const Length& computedLength() const { return m_computedLength; }

  BasicShapeCenterCoordinate blend(const BasicShapeCenterCoordinate& other,
                                   double progress) const {
    return BasicShapeCenterCoordinate(
        TopLeft, m_computedLength.blend(other.m_computedLength, progress,
                                        ValueRangeAll));
  }

 private:
  Direction m_direction;
  Length m_length;
  Length m_computedLength;
};

class BasicShapeRadius {
  DISALLOW_NEW();

 public:
  enum RadiusType { Value, ClosestSide, FarthestSide };
  BasicShapeRadius() : m_type(ClosestSide) {}
  explicit BasicShapeRadius(const Length& v) : m_value(v), m_type(Value) {}
  explicit BasicShapeRadius(RadiusType t) : m_type(t) {}
  BasicShapeRadius(const BasicShapeRadius& other)
      : m_value(other.value()), m_type(other.type()) {}
  bool operator==(const BasicShapeRadius& other) const {
    return m_type == other.m_type && m_value == other.m_value;
  }

  const Length& value() const { return m_value; }
  RadiusType type() const { return m_type; }

  bool canBlend(const BasicShapeRadius& other) const {
    // FIXME determine how to interpolate between keywords. See issue 330248.
    return m_type == Value && other.type() == Value;
  }

  BasicShapeRadius blend(const BasicShapeRadius& other, double progress) const {
    if (m_type != Value || other.type() != Value)
      return BasicShapeRadius(other);

    return BasicShapeRadius(
        m_value.blend(other.value(), progress, ValueRangeNonNegative));
  }

 private:
  Length m_value;
  RadiusType m_type;
};

class CORE_EXPORT BasicShapeCircle final : public BasicShape {
 public:
  static PassRefPtr<BasicShapeCircle> create() {
    return adoptRef(new BasicShapeCircle);
  }

  const BasicShapeCenterCoordinate& centerX() const { return m_centerX; }
  const BasicShapeCenterCoordinate& centerY() const { return m_centerY; }
  const BasicShapeRadius& radius() const { return m_radius; }

  float floatValueForRadiusInBox(FloatSize) const;
  void setCenterX(BasicShapeCenterCoordinate centerX) { m_centerX = centerX; }
  void setCenterY(BasicShapeCenterCoordinate centerY) { m_centerY = centerY; }
  void setRadius(BasicShapeRadius radius) { m_radius = radius; }

  void path(Path&, const FloatRect&) override;
  PassRefPtr<BasicShape> blend(const BasicShape*, double) const override;
  bool operator==(const BasicShape&) const override;

  ShapeType type() const override { return BasicShapeCircleType; }

 private:
  BasicShapeCircle() {}

  BasicShapeCenterCoordinate m_centerX;
  BasicShapeCenterCoordinate m_centerY;
  BasicShapeRadius m_radius;
};

DEFINE_BASICSHAPE_TYPE_CASTS(BasicShapeCircle);

class BasicShapeEllipse final : public BasicShape {
 public:
  static PassRefPtr<BasicShapeEllipse> create() {
    return adoptRef(new BasicShapeEllipse);
  }

  const BasicShapeCenterCoordinate& centerX() const { return m_centerX; }
  const BasicShapeCenterCoordinate& centerY() const { return m_centerY; }
  const BasicShapeRadius& radiusX() const { return m_radiusX; }
  const BasicShapeRadius& radiusY() const { return m_radiusY; }
  float floatValueForRadiusInBox(const BasicShapeRadius&,
                                 float center,
                                 float boxWidthOrHeight) const;

  void setCenterX(BasicShapeCenterCoordinate centerX) { m_centerX = centerX; }
  void setCenterY(BasicShapeCenterCoordinate centerY) { m_centerY = centerY; }
  void setRadiusX(BasicShapeRadius radiusX) { m_radiusX = radiusX; }
  void setRadiusY(BasicShapeRadius radiusY) { m_radiusY = radiusY; }

  void path(Path&, const FloatRect&) override;
  PassRefPtr<BasicShape> blend(const BasicShape*, double) const override;
  bool operator==(const BasicShape&) const override;

  ShapeType type() const override { return BasicShapeEllipseType; }

 private:
  BasicShapeEllipse() {}

  BasicShapeCenterCoordinate m_centerX;
  BasicShapeCenterCoordinate m_centerY;
  BasicShapeRadius m_radiusX;
  BasicShapeRadius m_radiusY;
};

DEFINE_BASICSHAPE_TYPE_CASTS(BasicShapeEllipse);

class BasicShapePolygon final : public BasicShape {
 public:
  static PassRefPtr<BasicShapePolygon> create() {
    return adoptRef(new BasicShapePolygon);
  }

  const Vector<Length>& values() const { return m_values; }
  Length getXAt(unsigned i) const { return m_values.at(2 * i); }
  Length getYAt(unsigned i) const { return m_values.at(2 * i + 1); }

  void setWindRule(WindRule windRule) { m_windRule = windRule; }
  void appendPoint(const Length& x, const Length& y) {
    m_values.append(x);
    m_values.append(y);
  }

  void path(Path&, const FloatRect&) override;
  PassRefPtr<BasicShape> blend(const BasicShape*, double) const override;
  bool operator==(const BasicShape&) const override;

  WindRule getWindRule() const override { return m_windRule; }

  ShapeType type() const override { return BasicShapePolygonType; }

 private:
  BasicShapePolygon() : m_windRule(RULE_NONZERO) {}

  WindRule m_windRule;
  Vector<Length> m_values;
};

DEFINE_BASICSHAPE_TYPE_CASTS(BasicShapePolygon);

class BasicShapeInset : public BasicShape {
 public:
  static PassRefPtr<BasicShapeInset> create() {
    return adoptRef(new BasicShapeInset);
  }

  const Length& top() const { return m_top; }
  const Length& right() const { return m_right; }
  const Length& bottom() const { return m_bottom; }
  const Length& left() const { return m_left; }

  const LengthSize& topLeftRadius() const { return m_topLeftRadius; }
  const LengthSize& topRightRadius() const { return m_topRightRadius; }
  const LengthSize& bottomRightRadius() const { return m_bottomRightRadius; }
  const LengthSize& bottomLeftRadius() const { return m_bottomLeftRadius; }

  void setTop(const Length& top) { m_top = top; }
  void setRight(const Length& right) { m_right = right; }
  void setBottom(const Length& bottom) { m_bottom = bottom; }
  void setLeft(const Length& left) { m_left = left; }

  void setTopLeftRadius(const LengthSize& radius) { m_topLeftRadius = radius; }
  void setTopRightRadius(const LengthSize& radius) {
    m_topRightRadius = radius;
  }
  void setBottomRightRadius(const LengthSize& radius) {
    m_bottomRightRadius = radius;
  }
  void setBottomLeftRadius(const LengthSize& radius) {
    m_bottomLeftRadius = radius;
  }

  void path(Path&, const FloatRect&) override;
  PassRefPtr<BasicShape> blend(const BasicShape*, double) const override;
  bool operator==(const BasicShape&) const override;

  ShapeType type() const override { return BasicShapeInsetType; }

 private:
  BasicShapeInset() {}

  Length m_right;
  Length m_top;
  Length m_bottom;
  Length m_left;

  LengthSize m_topLeftRadius;
  LengthSize m_topRightRadius;
  LengthSize m_bottomRightRadius;
  LengthSize m_bottomLeftRadius;
};

DEFINE_BASICSHAPE_TYPE_CASTS(BasicShapeInset);

}  // namespace blink
#endif
