{% extends "base/class.php.twig" %}

{% block file_path %}
\Drupal\{{ module }}\Plugin\Field\FieldType\{{ class_name }}.
{% endblock %}

{% block namespace_class %}
namespace Drupal\{{ module }}\Plugin\Field\FieldType;
{% endblock %}

{% block use_class %}
use Drupal\Component\Utility\Random;
use Drupal\Core\Field\FieldDefinitionInterface;
use Drupal\Core\Field\FieldItemBase;
use Drupal\Core\Field\FieldStorageDefinitionInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\StringTranslation\TranslatableMarkup;
use Drupal\Core\TypedData\DataDefinition;
{% endblock %}

{% block class_declaration %}
/**
 * Plugin implementation of the '{{ plugin_id }}' field type.
 *
 * @FieldType(
 *   id = "{{ plugin_id }}",
 *   label = @Translation("{{ label }}"),
 *   description = @Translation("{{ description }}"){% if default_widget or default_formatter %},
{% endif %}
{% if default_widget %}
 *   default_widget = "{{ default_widget }}"{% if default_widget and default_formatter %},
{% endif %}
{% else %}
{% endif %}
{%  if default_formatter %}
 *   default_formatter = "{{ default_formatter }}"
{% else %}
{%  endif %}
 * )
 */
class {{ class_name }} extends FieldItemBase {% endblock %}
{% block class_methods %}
  /**
   * {@inheritdoc}
   */
  public static function defaultStorageSettings() {
    return array(
      'max_length' => 255,
      'is_ascii' => FALSE,
      'case_sensitive' => FALSE,
    ) + parent::defaultStorageSettings();
  }

  /**
   * {@inheritdoc}
   */
  public static function propertyDefinitions(FieldStorageDefinitionInterface $field_definition) {
    // Prevent early t() calls by using the TranslatableMarkup.
    $properties['value'] = DataDefinition::create('string')
      ->setLabel(new TranslatableMarkup('Text value'))
      ->setSetting('case_sensitive', $field_definition->getSetting('case_sensitive'))
      ->setRequired(TRUE);

    return $properties;
  }

  /**
   * {@inheritdoc}
   */
  public static function schema(FieldStorageDefinitionInterface $field_definition) {
    $schema = array(
      'columns' => array(
        'value' => array(
          'type' => $field_definition->getSetting('is_ascii') === TRUE ? 'varchar_ascii' : 'varchar',
          'length' => (int) $field_definition->getSetting('max_length'),
          'binary' => $field_definition->getSetting('case_sensitive'),
        ),
      ),
    );

    return $schema;
  }

  /**
   * {@inheritdoc}
   */
  public function getConstraints() {
    $constraints = parent::getConstraints();

    if ($max_length = $this->getSetting('max_length')) {
      $constraint_manager = \Drupal::typedDataManager()->getValidationConstraintManager();
      $constraints[] = $constraint_manager->create('ComplexData', array(
        'value' => array(
          'Length' => array(
            'max' => $max_length,
            'maxMessage' => t('%name: may not be longer than @max characters.', array(
              '%name' => $this->getFieldDefinition()->getLabel(),
              '@max' => $max_length
            )),
          ),
        ),
      ));
    }

    return $constraints;
  }

  /**
   * {@inheritdoc}
   */
  public static function generateSampleValue(FieldDefinitionInterface $field_definition) {
    $random = new Random();
    $values['value'] = $random->word(mt_rand(1, $field_definition->getSetting('max_length')));
    return $values;
  }

  /**
   * {@inheritdoc}
   */
  public function storageSettingsForm(array &$form, FormStateInterface $form_state, $has_data) {
    $elements = [];

    $elements['max_length'] = array(
      '#type' => 'number',
      '#title' => t('Maximum length'),
      '#default_value' => $this->getSetting('max_length'),
      '#required' => TRUE,
      '#description' => t('The maximum length of the field in characters.'),
      '#min' => 1,
      '#disabled' => $has_data,
    );

    return $elements;
  }

  /**
   * {@inheritdoc}
   */
  public function isEmpty() {
    $value = $this->get('value')->getValue();
    return $value === NULL || $value === '';
  }
{% endblock %}
