#ifndef RUNNER_FLUTTER_WINDOW_H_
#define RUNNER_FLUTTER_WINDOW_H_

#include <flutter/dart_project.h>
#include <flutter/flutter_view_controller.h>
#include <flutter/method_channel.h>

#include <memory>

#include "win32_window.h"

// A window that does nothing but host a Flutter view.
class FlutterWindow : public Win32Window {
 public:
  // Creates a new FlutterWindow hosting a Flutter view running |project|.
  explicit FlutterWindow(const flutter::DartProject& project);
  virtual ~FlutterWindow();

 protected:
  // Win32Window:
  bool OnCreate() override;
  void OnDestroy() override;
  LRESULT MessageHandler(HWND window, UINT const message, WPARAM const wparam,
                         LPARAM const lparam) noexcept override;

 private:
  // The project to run.
  flutter::DartProject project_;

  // The Flutter instance hosted in this window.
  std::unique_ptr<flutter::FlutterViewController> flutter_controller_;

  // Windows platform MethodChannel for theme control.
  std::unique_ptr<flutter::MethodChannel<>> platform_channel_;

  // 窗口控制 MethodChannel（窗口大小预设菜单等）
  std::unique_ptr<flutter::MethodChannel<>> window_control_channel_;

  // 弹出原生窗口大小预设菜单（TrackPopupMenuEx）
  // 返回 true 表示用户选择了某个尺寸，false 表示用户取消了菜单
  bool ShowWindowSizeMenu(HWND hwnd);

  // Subclass ID for the Flutter child window (WM_NCHITTEST → HTTRANSPARENT)
  static const UINT_PTR kChildSubclassId = 12345;

  // Subclass callback: forward title-bar hit-test to parent window so the
  // parent can return HTCAPTION and Windows performs native modal dragging.
  static LRESULT CALLBACK ChildWndProc(HWND hwnd, UINT message,
                                       WPARAM wparam, LPARAM lparam,
                                       UINT_PTR subclass_id,
                                       DWORD_PTR ref_data);

  // ============================================================
  // 原生拖拽状态：SC_MOVE 模态循环期间绕过插件链 + 子窗口消息拦截
  //
  // 根因（经 v1~v8 验证）：
  // 1. 手动 SetWindowPos 拖拽不触发 DWM "live drag" 优化
  // 2. 完全禁用 Mica 能解决卡顿（v8 验证），但临时禁用 Mica（v4~v7）失败
  // 3. v4~v7 失败的原因：EnterSizeMove 遗漏了 SetWindowCompositionAttribute
  //    (ACCENT_DISABLED) 调用——这是 flutter_acrylic 的 setEffect(disabled)
  //    能立即禁用 Mica 的关键。仅靠 DwmSetWindowAttribute 是异步的，不生效。
  //
  // 修复（v9）：
  // - WM_NCLBUTTONDOWN(HTCAPTION) 时调用 EnterSizeMove 禁用 Mica
  //   （现在包含 SetWindowCompositionAttribute(ACCENT_DISABLED)，能立即生效）
  // - SWP_FRAMECHANGED 强制 DWM 同步应用变更
  // - DefWindowProc 进入 SC_MOVE 模态循环
  // - DefWindowProc 返回后调用 ExitSizeMove 恢复 Mica + SWP_FRAMECHANGED
  // - 模态循环期间绕过插件链 + 子窗口消息拦截（v8）
  // ============================================================
  static bool is_in_native_drag_;
};

#endif  // RUNNER_FLUTTER_WINDOW_H_