// SPDX-License-Identifier: LGPL-2.1-or-later
#pragma once
#include <windows.h>
#include <cstdint>
#include <memory>
#include <string>

// Native focus owners can keep keyboard focus while their visible popup
// reports accessible item focus. Unrelated windows are never event sources.
bool msaa_event_in_foreground(HWND window);

struct MsaaEvent {
  HWND window = nullptr;
  DWORD event = 0, process = 0, thread = 0;
  LONG object = 0, child = 0;
  uint64_t generation = 0, deadline = 0;
};
struct MsaaResult {
  MsaaEvent source;
  bool available = false, native_client = false, password = false;
  std::string name, role, value, states, description;
  LONG count = 0;
};

// One COM worker owns native references. The event thread exchanges only
// copied requests/results, and never waits for a provider to finish.
class MsaaEventReader {
public:
  ~MsaaEventReader();
  bool start();
  void invalidate(uint64_t generation);
  void submit(const MsaaEvent &event);
  bool take(MsaaResult &result);
  void stop();
private:
  struct State;
  std::shared_ptr<State> state_;
  HANDLE worker_ = nullptr;
};