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#ifndef MOZC_WIN32_BASE_FOCUS_HIERARCHY_OBSERVER_H_
#define MOZC_WIN32_BASE_FOCUS_HIERARCHY_OBSERVER_H_

#include <windows.h>

#include <string>
#include <vector>

#include "base/port.h"
#include "win32/base/accessible_object_info.h"

namespace mozc {
namespace win32 {

class FocusHierarchyObserver {
 public:
  struct WindowInfo {
    WindowInfo();
    HWND   window_handle;
    string title;         // utf8
    string class_name;    // utf8
    DWORD  process_id;
  };

  virtual ~FocusHierarchyObserver();

  virtual void SyncFocusHierarchy() = 0;
  virtual bool IsAbailable() const = 0;
  virtual vector<AccessibleObjectInfo> GetUIHierarchy() const = 0;
  virtual vector<WindowInfo> GetWindowHierarchy() const = 0;
  virtual string GetRootWindowName() const = 0;

  static FocusHierarchyObserver *Create();
  static void OnDllProcessAttach(HINSTANCE module_handle,
                                 bool static_loading);
  static void OnDllProcessDetach(HINSTANCE module_handle,
                                 bool process_shutdown);
};

}  // namespace win32
}  // namespace mozc

#endif  // MOZC_WIN32_BASE_FOCUS_HIERARCHY_OBSERVER_H_