class DevelGenerateForm

class DevelGenerateForm extends FormBase {
  
  /**
   * The manager to be used for instantiating plugins.
   */
  protected PluginManagerInterface $develGenerateManager;
  
  /**
   * Logger service.
   */
  protected LoggerInterface $logger;
  
  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) : static {
    $instance = parent::create($container);
    $instance->develGenerateManager = $container->get('plugin.manager.develgenerate');
    $instance->messenger = $container->get('messenger');
    $instance->logger = $container->get('logger.channel.devel_generate');
    $instance->requestStack = $container->get('request_stack');
    $instance->stringTranslation = $container->get('string_translation');
    return $instance;
  }
  
  /**
   * {@inheritdoc}
   */
  public function getFormId() : string {
    return 'devel_generate_form_' . $this->getPluginIdFromRequest();
  }
  
  /**
   * Returns the value of the param _plugin_id for the current request.
   *
   * @see \Drupal\devel_generate\Routing\DevelGenerateRouteSubscriber
   */
  protected function getPluginIdFromRequest() {
    $request = $this->requestStack
      ->getCurrentRequest();
    return $request->get('_plugin_id');
  }
  
  /**
   * Returns a DevelGenerate plugin instance for a given plugin id.
   *
   * @param string $plugin_id
   *   The plugin_id for the plugin instance.
   *
   * @return \Drupal\devel_generate\DevelGenerateBaseInterface
   *   A DevelGenerate plugin instance.
   */
  public function getPluginInstance(string $plugin_id) : DevelGenerateBaseInterface {
    return $this->develGenerateManager
      ->createInstance($plugin_id, []);
  }
  
  /**
   * {@inheritdoc}
   */
  public function buildForm(array $form, FormStateInterface $form_state) : array {
    $plugin_id = $this->getPluginIdFromRequest();
    $instance = $this->getPluginInstance($plugin_id);
    $form = $instance->settingsForm($form, $form_state);
    $form['actions'] = [
      '#type' => 'actions',
    ];
    $form['actions']['submit'] = [
      '#type' => 'submit',
      '#value' => $this->t('Generate'),
      '#button_type' => 'primary',
    ];
    return $form;
  }
  
  /**
   * {@inheritdoc}
   */
  public function validateForm(array &$form, FormStateInterface $form_state) : void {
    $plugin_id = $this->getPluginIdFromRequest();
    $instance = $this->getPluginInstance($plugin_id);
    $instance->settingsFormValidate($form, $form_state);
  }
  
  /**
   * {@inheritdoc}
   */
  public function submitForm(array &$form, FormStateInterface $form_state) : void {
    try {
      $plugin_id = $this->getPluginIdFromRequest();
      $instance = $this->getPluginInstance($plugin_id);
      $instance->generate($form_state->getValues());
    } catch (\Exception $e) {
      $this->logger
        ->error($this->t('Failed to generate elements due to "%error".', [
        '%error' => $e->getMessage(),
      ]));
      $this->messenger
        ->addMessage($this->t('Failed to generate elements due to "%error".', [
        '%error' => $e->getMessage(),
      ]));
    }
  }

}