class FieldCollectionType

class FieldCollectionType extends DrupalSqlBase {

  /**
   * {@inheritdoc}
   */
  public function defaultConfiguration() {
    return [
      'add_description' => FALSE,
    ] + parent::defaultConfiguration();
  }

  /**
   * {@inheritdoc}
   */
  public function query() {
    $query = $this
      ->select('field_config', 'fc')
      ->fields('fc');
    $query
      ->condition('fc.type', 'field_collection');
    $query
      ->condition('fc.active', TRUE);
    return $query;
  }

  /**
   * {@inheritdoc}
   */
  public function prepareRow(Row $row) {
    $name = $row
      ->getSourceProperty('field_name');

    // Remove field_ prefix for new bundle.
    $bundle = substr($name, FieldCollection::FIELD_COLLECTION_PREFIX_LENGTH);
    $row
      ->setSourceProperty('bundle', $bundle);

    // Field collections don't have descriptions, optionally add one.
    if ($this->configuration['add_description']) {
      $row
        ->setSourceProperty('description', 'Migrated from field_collection ' . $name);
    }
    else {
      $row
        ->setSourceProperty('description', '');
    }

    // Set label from bundle because we don't have a label in D7 field
    // collections.
    $row
      ->setSourceProperty('name', ucfirst(preg_replace('/_/', ' ', $bundle)));
    return parent::prepareRow($row);
  }

  /**
   * {@inheritdoc}
   */
  public function fields() {
    return [
      'field_name' => $this
        ->t('Original field collection bundle/field_name'),
      'bundle' => $this
        ->t('Paragraph type machine name'),
      'name' => $this
        ->t('Paragraph type label'),
      'description' => $this
        ->t('Paragraph type description'),
    ];
  }

  /**
   * {@inheritdoc}
   */
  public function getIds() {
    $ids['field_name']['type'] = 'string';
    return $ids;
  }

  /**
   * {@inheritdoc}
   *
   * @deprecated addDescription configuration key is deprecated in 8.x-1.0 and
   * will be removed prior to 9.x.  Use add_description instead.
   *
   * @see https://www.drupal.org/project/paragraphs/issues/2911242
   */
  public function setConfiguration(array $configuration) {

    // Configuration keys should be snake_case, not CamelCase. Adding a BC
    // layer for addDescription which should be deprecated.
    if (isset($configuration['addDescription'])) {
      @trigger_error("addDescription configuration key is deprecated in 8.x-1.0 and will be removed prior to 9.x.  Use add_description instead. See https://www.drupal.org/project/paragraphs/issues/2911242", E_USER_DEPRECATED);
      if (!isset($configuration['add_description'])) {
        $configuration['add_description'] = $configuration['addDescription'];
      }
      unset($configuration['addDescription']);
    }
    parent::setConfiguration($configuration);
  }

}