#pragma once

#include <core/types.h>
#include <graphics/font.h>
#include <ui/widget.h>

namespace extra2d {

// ============================================================================
// 滑动条组件
// ============================================================================
class Slider : public Widget {
public:
  Slider();
  ~Slider() override = default;

  static Ptr<Slider> create();
  static Ptr<Slider> create(float min, float max, float value);

  // ------------------------------------------------------------------------
  // 数值范围
  // ------------------------------------------------------------------------
  void setRange(float min, float max);
  float getMin() const { return min_; }
  float getMax() const { return max_; }

  // ------------------------------------------------------------------------
  // 当前值
  // ------------------------------------------------------------------------
  void setValue(float value);
  float getValue() const { return value_; }

  // ------------------------------------------------------------------------
  // 步进值
  // ------------------------------------------------------------------------
  void setStep(float step);
  float getStep() const { return step_; }

  // ------------------------------------------------------------------------
  // 方向
  // ------------------------------------------------------------------------
  void setVertical(bool vertical);
  bool isVertical() const { return vertical_; }

  // ------------------------------------------------------------------------
  // 轨道尺寸
  // ------------------------------------------------------------------------
  void setTrackSize(float size);
  float getTrackSize() const { return trackSize_; }

  // ------------------------------------------------------------------------
  // 滑块尺寸
  // ------------------------------------------------------------------------
  void setThumbSize(float size);
  float getThumbSize() const { return thumbSize_; }

  // ------------------------------------------------------------------------
  // 颜色设置
  // ------------------------------------------------------------------------
  void setTrackColor(const Color &color);
  Color getTrackColor() const { return trackColor_; }

  void setFillColor(const Color &color);
  Color getFillColor() const { return fillColor_; }

  void setThumbColor(const Color &color);
  Color getThumbColor() const { return thumbColor_; }

  void setThumbHoverColor(const Color &color);
  Color getThumbHoverColor() const { return thumbHoverColor_; }

  void setThumbPressedColor(const Color &color);
  Color getThumbPressedColor() const { return thumbPressedColor_; }

  // ------------------------------------------------------------------------
  // 显示设置
  // ------------------------------------------------------------------------
  void setShowThumb(bool show);
  bool isShowThumb() const { return showThumb_; }

  void setShowFill(bool show);
  bool isShowFill() const { return showFill_; }

  // ------------------------------------------------------------------------
  // 文本显示
  // ------------------------------------------------------------------------
  void setTextEnabled(bool enabled);
  bool isTextEnabled() const { return textEnabled_; }

  void setFont(Ptr<FontAtlas> font);
  Ptr<FontAtlas> getFont() const { return font_; }

  void setTextColor(const Color &color);
  Color getTextColor() const { return textColor_; }

  void setTextFormat(const std::string &format);
  const std::string &getTextFormat() const { return textFormat_; }

  // ------------------------------------------------------------------------
  // 回调设置
  // ------------------------------------------------------------------------
  void setOnValueChange(Function<void(float)> callback);
  void setOnDragStart(Function<void()> callback);
  void setOnDragEnd(Function<void()> callback);

  Rect boundingBox() const override;

protected:
  void onDrawWidget(Renderer &renderer) override;
  bool onMousePress(const MouseEvent &event) override;
  bool onMouseRelease(const MouseEvent &event) override;
  bool onMouseMove(const MouseEvent &event) override;
  void onMouseEnter() override;
  void onMouseLeave() override;

private:
  float min_ = 0.0f;
  float max_ = 100.0f;
  float value_ = 50.0f;
  float step_ = 0.0f;

  bool vertical_ = false;
  float trackSize_ = 6.0f;
  float thumbSize_ = 16.0f;

  Color trackColor_ = Color(0.3f, 0.3f, 0.3f, 1.0f);
  Color fillColor_ = Color(0.2f, 0.6f, 1.0f, 1.0f);
  Color thumbColor_ = Color(0.8f, 0.8f, 0.8f, 1.0f);
  Color thumbHoverColor_ = Color(1.0f, 1.0f, 1.0f, 1.0f);
  Color thumbPressedColor_ = Color(0.6f, 0.6f, 0.6f, 1.0f);

  bool showThumb_ = true;
  bool showFill_ = true;

  bool textEnabled_ = false;
  Ptr<FontAtlas> font_;
  Color textColor_ = Colors::White;
  std::string textFormat_ = "{value:.0f}";

  bool dragging_ = false;
  bool hovered_ = false;

  Function<void(float)> onValueChange_;
  Function<void()> onDragStart_;
  Function<void()> onDragEnd_;

  float valueToPosition(float value) const;
  float positionToValue(float pos) const;
  Rect getThumbRect() const;
  Rect getTrackRect() const;
  std::string formatText() const;
  float snapToStep(float value) const;
};

} // namespace extra2d