#pragma once

#include <cstdint>
#include <core/types.h>
#include <core/vec2.h>
#include <variant>

namespace extra2d {

// ============================================================================
// 事件类型枚举
// ============================================================================
enum class EventType {
  None = 0,

  // 窗口事件
  WindowClose,
  WindowResize,
  WindowFocus,
  WindowLostFocus,
  WindowMoved,

  // 键盘事件
  KeyPressed,
  KeyReleased,
  KeyRepeat,

  // 鼠标事件
  MouseButtonPressed,
  MouseButtonReleased,
  MouseMoved,
  MouseScrolled,

  // UI 事件
  UIHoverEnter,
  UIHoverExit,
  UIPressed,
  UIReleased,
  UIClicked,

  // 游戏手柄事件
  GamepadConnected,
  GamepadDisconnected,
  GamepadButtonPressed,
  GamepadButtonReleased,
  GamepadAxisMoved,

  // 触摸事件 (移动端)
  TouchBegan,
  TouchMoved,
  TouchEnded,
  TouchCancelled,

  // 自定义事件
  Custom
};

// ============================================================================
// 键盘事件数据
// ============================================================================
struct KeyEvent {
  int keyCode;
  int scancode;
  int mods; // 修饰键 (Shift, Ctrl, Alt, etc.)
};

// ============================================================================
// 鼠标事件数据
// ============================================================================
struct MouseButtonEvent {
  int button;
  int mods;
  Vec2 position;
};

struct MouseMoveEvent {
  Vec2 position;
  Vec2 delta;
};

struct MouseScrollEvent {
  Vec2 offset;
  Vec2 position;
};

// ============================================================================
// 窗口事件数据
// ============================================================================
struct WindowResizeEvent {
  int width;
  int height;
};

struct WindowMoveEvent {
  int x;
  int y;
};

// ============================================================================
// 游戏手柄事件数据
// ============================================================================
struct GamepadButtonEvent {
  int gamepadId;
  int button;
};

struct GamepadAxisEvent {
  int gamepadId;
  int axis;
  float value;
};

// ============================================================================
// 触摸事件数据
// ============================================================================
struct TouchEvent {
  int touchId;
  Vec2 position;
};

// ============================================================================
// 自定义事件数据
// ============================================================================
struct CustomEvent {
  uint32_t id;
  void *data;
};

// ============================================================================
// 事件结构
// ============================================================================
struct Event {
  EventType type = EventType::None;
  double timestamp = 0.0;
  bool handled = false;

  // 事件数据联合体
  std::variant<std::monostate, KeyEvent, MouseButtonEvent, MouseMoveEvent,
               MouseScrollEvent, WindowResizeEvent, WindowMoveEvent,
               GamepadButtonEvent, GamepadAxisEvent, TouchEvent, CustomEvent>
      data;

  // 便捷访问方法
  bool isWindowEvent() const {
    return type == EventType::WindowClose || type == EventType::WindowResize ||
           type == EventType::WindowFocus ||
           type == EventType::WindowLostFocus || type == EventType::WindowMoved;
  }

  bool isKeyboardEvent() const {
    return type == EventType::KeyPressed || type == EventType::KeyReleased ||
           type == EventType::KeyRepeat;
  }

  bool isMouseEvent() const {
    return type == EventType::MouseButtonPressed ||
           type == EventType::MouseButtonReleased ||
           type == EventType::MouseMoved || type == EventType::MouseScrolled;
  }

  // 静态工厂方法
  static Event createWindowResize(int width, int height);
  static Event createWindowClose();
  static Event createKeyPress(int keyCode, int scancode, int mods);
  static Event createKeyRelease(int keyCode, int scancode, int mods);
  static Event createMouseButtonPress(int button, int mods, const Vec2 &pos);
  static Event createMouseButtonRelease(int button, int mods, const Vec2 &pos);
  static Event createMouseMove(const Vec2 &pos, const Vec2 &delta);
  static Event createMouseScroll(const Vec2 &offset, const Vec2 &pos);
};

} // namespace extra2d