class EntityClone

final class EntityClone implements ConfigActionPluginInterface, ContainerFactoryPluginInterface {
  public function __construct(private readonly ConfigManagerInterface $configManager, private readonly ConfigActionManager $configActionManager) {
  }
  
  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) : static {
    return new static($container->get(ConfigManagerInterface::class), $container->get('plugin.manager.config_action'));
  }
  
  /**
   * {@inheritdoc}
   */
  public function apply(string $configName, mixed $value) : void {
    if (!is_array($value)) {
      $value = [
        'id' => $value,
      ];
    }
    assert(is_string($value['id']));
    $value += [
      'fail_if_exists' => FALSE,
    ];
    assert(is_bool($value['fail_if_exists']));
    // If the original doesn't exist, there's nothing to clone.
    $original = $this->configManager
      ->loadConfigEntityByName($configName);
    if (empty($original)) {
      throw new ConfigActionException("Cannot clone '{$configName}' because it does not exist.");
    }
    // Treat the original ID like a period-separated array of strings, and
    // replace any `%` parts in the clone's ID with the corresponding part of
    // the original ID. For example, if we're cloning an entity view display
    // with the ID `node.foo.teaser`, and the clone's ID is
    // `node.%.search_result`, the final ID of the clone will be
    // `node.foo.search_result`.
    $original_id_parts = explode('.', $original->id());
    $clone_id_parts = explode('.', $value['id']);
    assert(count($original_id_parts) === count($clone_id_parts));
    foreach ($clone_id_parts as $index => $part) {
      $clone_id_parts[$index] = $part === '%' ? $original_id_parts[$index] : $part;
    }
    $value['id'] = implode('.', $clone_id_parts);
    $clone = $original->createDuplicate();
    $clone->set($original->getEntityType()
      ->getKey('id'), $value['id']);
    $create_action = 'entity_create:' . ($value['fail_if_exists'] ? 'create' : 'createIfNotExists');
    // Use the config action manager to invoke the create action on the clone,
    // so that it will be validated.
    $this->configActionManager
      ->applyAction($create_action, $clone->getConfigDependencyName(), $clone->toArray());
  }

}