class IconExtractorBase

abstract class IconExtractorBase extends PluginBase implements IconExtractorInterface, PluginWithFormsInterface {
  use PluginWithFormsTrait;
  // Remove internal values and allow extractor to add any needed values.
  private const DEFINITION_REMOVE = [
    'enabled',
    'template',
    'description',
    'links',
    'config',
  ];
  
  /**
   * {@inheritdoc}
   */
  public function label() : string {
    return (string) $this->pluginDefinition['label'];
  }
  
  /**
   * {@inheritdoc}
   */
  public function description() : string {
    return (string) $this->pluginDefinition['description'];
  }
  
  /**
   * {@inheritdoc}
   */
  public function buildConfigurationForm(array $form, FormStateInterface $form_state) : array {
    if (!isset($this->configuration['settings'])) {
      return $form;
    }
    return IconExtractorSettingsForm::generateSettingsForm($this->configuration['settings'], $form_state);
  }
  
  /**
   * {@inheritdoc}
   */
  public function validateConfigurationForm(array &$form, FormStateInterface $form_state) : void {
  }
  
  /**
   * {@inheritdoc}
   */
  public function submitConfigurationForm(array &$form, FormStateInterface $form_state) : void {
  }
  
  /**
   * {@inheritdoc}
   */
  public function loadIcon(array $icon_data) : ?IconDefinitionInterface {
    if (!isset($icon_data['icon_id']) || empty($icon_data['icon_id'])) {
      return NULL;
    }
    return $this->createIcon($icon_data['icon_id'], $icon_data['source'] ?? '', $icon_data['group'] ?? NULL);
  }
  
  /**
   * {@inheritdoc}
   */
  public function createIcon(string $icon_id, ?string $source = NULL, ?string $group = NULL, ?array $data = NULL) : IconDefinitionInterface {
    if (!isset($this->configuration['template'])) {
      throw new IconPackConfigErrorException(sprintf('Missing `template` in your definition, extractor %s requires this value.', $this->getPluginId()));
    }
    // Clean unused pack definition values as they will be passed to the context
    // of the Twig.
    $data_definition = array_diff_key($this->configuration, array_flip(self::DEFINITION_REMOVE));
    return IconDefinition::create($this->configuration['id'], $icon_id, $this->configuration['template'], $source, $group, $data ? array_merge($data, $data_definition) : $data_definition);
  }

}