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(),
            ]));
        }
    }

}