class ExampleDevelGenerate

class ExampleDevelGenerate extends DevelGenerateBase implements ContainerFactoryPluginInterface {
  
  /**
   * Provides system time.
   */
  protected TimeInterface $time;
  
  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) : static {
    $instance = parent::create($container, $configuration, $plugin_id, $plugin_definition);
    $instance->time = $container->get('datetime.time');
    return $instance;
  }
  
  /**
   * {@inheritdoc}
   */
  public function settingsForm(array $form, FormStateInterface $form_state) : array {
    $form['num'] = [
      '#type' => 'textfield',
      '#title' => $this->t('How many examples would you like to generate?'),
      '#default_value' => $this->getSetting('num'),
      '#size' => 10,
    ];
    $form['kill'] = [
      '#type' => 'checkbox',
      '#title' => $this->t('Delete all examples before generating new examples.'),
      '#default_value' => $this->getSetting('kill'),
    ];
    return $form;
  }
  
  /**
   * {@inheritdoc}
   */
  protected function generateElements(array $values) : void {
    $num = $values['num'];
    $kill = $values['kill'];
    if ($kill) {
      $this->setMessage($this->t('Old examples have been deleted.'));
    }
    // Creating user in order to demonstrate
    // how to override default business login generation.
    $edit = [
      'uid' => NULL,
      'name' => 'example_devel_generate',
      'pass' => '',
      'mail' => 'example_devel_generate@example.com',
      'status' => 1,
      'created' => $this->time
        ->getRequestTime(),
      'roles' => '',
      // A flag to let hook_user_* know that this is a generated user.
'devel_generate' => TRUE,
    ];
    $account = user_load_by_name('example_devel_generate');
    if (!$account) {
      $account = $this->entityTypeManager
        ->getStorage('user')
        ->create($edit);
    }
    // Populate all fields with sample values.
    $this->populateFields($account);
    $account->save();
    $this->setMessage($this->t('@num_examples created.', [
      '@num_examples' => $this->formatPlural($num, '1 example', '@count examples'),
    ]));
  }
  
  /**
   * {@inheritdoc}
   */
  public function validateDrushParams(array $args, array $options = []) : array {
    return [
      'num' => $options['num'],
      'kill' => $options['kill'],
    ];
  }

}