// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "chrome/browser/win/installer_downloader/installer_downloader_active_browser_window_tracker.h"

#include "chrome/browser/ui/browser_window/public/browser_window_interface.h"
#include "chrome/browser/ui/browser_window/public/global_browser_collection.h"

namespace installer_downloader {

InstallerDownloaderActiveBrowserWindowTracker::
    InstallerDownloaderActiveBrowserWindowTracker() {
  auto* global_browser_collection = GlobalBrowserCollection::GetInstance();
  browser_collection_observation_.Observe(global_browser_collection);
  MaybeUpdateLastActiveWindow(global_browser_collection->GetActiveBrowser());
}

InstallerDownloaderActiveBrowserWindowTracker::
    ~InstallerDownloaderActiveBrowserWindowTracker() = default;

base::CallbackListSubscription InstallerDownloaderActiveBrowserWindowTracker::
    RegisterActiveWindowChangedCallback(WindowChangedCallback callback) {
  auto subscription = active_window_change_callbacks_.Add(callback);
  callback.Run(last_active_window_);
  return subscription;
}

base::CallbackListSubscription
InstallerDownloaderActiveBrowserWindowTracker::RegisterRemovedWindowCallback(
    WindowChangedCallback callback) {
  return window_remove_callbacks_.Add(callback);
}

void InstallerDownloaderActiveBrowserWindowTracker::OnBrowserActivated(
    BrowserWindowInterface* browser) {
  MaybeUpdateLastActiveWindow(browser);
}

void InstallerDownloaderActiveBrowserWindowTracker::OnBrowserClosed(
    BrowserWindowInterface* browser) {
  window_remove_callbacks_.Notify(browser);

  if (!last_active_window_ || browser != last_active_window_) {
    return;
  }

  MaybeUpdateLastActiveWindow(
      GlobalBrowserCollection::GetInstance()->GetActiveBrowser());
}

void InstallerDownloaderActiveBrowserWindowTracker::MaybeUpdateLastActiveWindow(
    BrowserWindowInterface* bwi) {
  if (bwi && bwi->GetType() != BrowserWindowInterface::TYPE_NORMAL) {
    bwi = nullptr;
  }

  if (last_active_window_ == bwi) {
    return;
  }

  last_active_window_ = bwi;
  active_window_change_callbacks_.Notify(last_active_window_);
}

}  // namespace installer_downloader