class SyncFactory

class SyncFactory {
  public function __construct(#[Autowire(param: 'app.root')] protected readonly string $root, protected readonly Settings $settings, #[Autowire(service: 'config.storage')] protected readonly StorageInterface $activeConfig, protected readonly ModuleExtensionList $moduleExtensionList, protected readonly ThemeExtensionList $themeExtensionList) {
  }
  
  /**
   * Gets a StorageInterface object working with the sync config directory.
   *
   * The FileStorage object is wrapped in an AutoloadingStorage object to ensure
   * we can read configuration from new extensions.
   *
   * @return \Drupal\Core\Config\StorageInterface
   *   The storage object for working with the config sync directory.
   *
   * @throws \Drupal\Core\Config\ConfigDirectoryNotDefinedException
   *   In case the sync directory does not exist or is not defined in
   *   $settings['config_sync_directory'].
   */
  public function get() : StorageInterface {
    $directory = $this->settings
      ->get('config_sync_directory', FALSE);
    if ($directory === FALSE) {
      throw new ConfigDirectoryNotDefinedException('The config sync directory is not defined in $settings["config_sync_directory"]');
    }
    $storage = new FileStorage($directory);
    return $this->wrapStorageWithAutoloadingStorage($storage);
  }
  
  /**
   * Wraps a StorageInterface object in an AutoloadingStorage object.
   *
   * The FileStorage object is wrapped in an AutoloadingStorage object to ensure
   * we can read configuration from new extensions.
   *
   * @param \Drupal\Core\Config\StorageInterface $storage
   *   The storage object to wrap.
   *
   * @return \Drupal\Core\Config\StorageInterface
   *   The wrapped storage object.
   */
  public function wrapStorageWithAutoloadingStorage(StorageInterface $storage) : StorageInterface {
    $storage_core_extension = $storage->read('core.extension') ?? [];
    $active_core_extension = $this->activeConfig
      ->read('core.extension') ?? [];
    return new AutoloadingStorage($storage, array_merge($this->getNewExtensions($this->moduleExtensionList, $storage_core_extension['module'] ?? [], $active_core_extension['module'] ?? []), $this->getNewExtensions($this->themeExtensionList, $storage_core_extension['theme'] ?? [], $active_core_extension['theme'] ?? [])));
  }
  
  /**
   * Gets a list of new extensions in the sync storage.
   *
   * @param \Drupal\Core\Extension\ExtensionList $extension_list
   *   The extension list service to use to find the extension's path.
   * @param array<string,string> $storage_extensions
   *   The list of extensions from the sync storage. The array keys are
   *   extension names.
   * @param array<string,string> $active_extensions
   *   The list of extensions from the active storage. The array keys are
   *   extension names.
   *
   * @return array<string,string>
   *   The list of extensions only in the sync storage. The array keys are the
   *   extensions names and the values are the absolute paths to the extension.
   */
  protected function getNewExtensions(ExtensionList $extension_list, array $storage_extensions, array $active_extensions) : array {
    foreach (array_diff_key($storage_extensions, $active_extensions) as $name => $weight) {
      try {
        $new_extensions[$name] = $this->root . '/' . $extension_list->getPath($name);
      } catch (UnknownExtensionException) {
        // If the extension is missing this will surface when reading or at
        // validation time.
      }
    }
    return $new_extensions ?? [];
  }

}