/*
 *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#include "webrtc/modules/desktop_capture/mac/window_list_utils.h"

#include <ApplicationServices/ApplicationServices.h>

#include "webrtc/base/macutils.h"

namespace webrtc {

bool GetWindowList(WindowCapturer::WindowList* windows) {
  // Only get on screen, non-desktop windows.
  CFArrayRef window_array = CGWindowListCopyWindowInfo(
      kCGWindowListOptionOnScreenOnly | kCGWindowListExcludeDesktopElements,
      kCGNullWindowID);
  if (!window_array)
    return false;

  // Check windows to make sure they have an id, title, and use window layer
  // other than 0.
  CFIndex count = CFArrayGetCount(window_array);
  for (CFIndex i = 0; i < count; ++i) {
    CFDictionaryRef window = reinterpret_cast<CFDictionaryRef>(
        CFArrayGetValueAtIndex(window_array, i));
    CFStringRef window_title = reinterpret_cast<CFStringRef>(
        CFDictionaryGetValue(window, kCGWindowName));
    CFNumberRef window_id = reinterpret_cast<CFNumberRef>(
        CFDictionaryGetValue(window, kCGWindowNumber));
    CFNumberRef window_layer = reinterpret_cast<CFNumberRef>(
        CFDictionaryGetValue(window, kCGWindowLayer));
    if (window_title && window_id && window_layer) {
      // Skip windows with layer=0 (menu, dock).
      int layer;
      CFNumberGetValue(window_layer, kCFNumberIntType, &layer);
      if (layer != 0)
        continue;

      int id;
      CFNumberGetValue(window_id, kCFNumberIntType, &id);
      WindowCapturer::Window window;
      window.id = id;
      if (!rtc::ToUtf8(window_title, &(window.title)) ||
          window.title.empty()) {
        continue;
      }
      windows->push_back(window);
    }
  }

  CFRelease(window_array);
  return true;
}

}  // namespace webrtc