// SPDX-License-Identifier: LGPL-2.1-or-later
#include "foreground_focus.h"
#include "review_x11.h"

namespace {
struct Candidate {
  HWND window = nullptr;
  unsigned count = 0;
};
BOOL CALLBACK find_candidate(HWND window, LPARAM data) {
  if (!IsWindowVisible(window) || !IsWindowEnabled(window) || IsIconic(window) ||
      (GetWindowLongPtrW(window, GWL_EXSTYLE) & (WS_EX_TOOLWINDOW | WS_EX_NOACTIVATE)) ||
      !GetPropW(window, L"__wine_x11_whole_window"))
    return TRUE;
  auto &candidate = *reinterpret_cast<Candidate *>(data);
  candidate.window = window;
  return ++candidate.count < 2;
}
}

bool restore_virtual_desktop_focus() {
  if (GetForegroundWindow() || !wine_x11_desktop_focused()) return false;
  Candidate candidate;
  EnumWindows(find_candidate, reinterpret_cast<LPARAM>(&candidate));
  // Recheck focus after enumeration so a Linux/application transition cannot
  // turn a recovery into activation of a background Wine application.
  if (candidate.count != 1 || GetForegroundWindow() || !wine_x11_desktop_focused())
    return false;
  return wine_x11_restore_focus(candidate.window);
}