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<?php

namespace Drupal\field_ui\Form;

use Drupal\Core\Entity\EntityForm;
use Drupal\Core\Field\AllowedTagsXssTrait;
use Drupal\Core\Field\FieldFilteredMarkup;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Url;
use Drupal\field\FieldConfigInterface;
use Drupal\field_ui\FieldUI;

/**
 * Provides a form for the field settings form.
 *
 * @internal
 */
class FieldConfigEditForm extends EntityForm {

  use AllowedTagsXssTrait;

  /**
   * The entity being used by this form.
   *
   * @var \Drupal\field\FieldConfigInterface
   */
  protected $entity;

  /**
   * {@inheritdoc}
   */
  public function form(array $form, FormStateInterface $form_state) {
    $form = parent::form($form, $form_state);

    $field_storage = $this->entity->getFieldStorageDefinition();
    $bundles = $this->entityManager->getBundleInfo($this->entity->getTargetEntityTypeId());

    $form_title = $this->t('%field settings for %bundle', [
      '%field' => $this->entity->getLabel(),
      '%bundle' => $bundles[$this->entity->getTargetBundle()]['label'],
    ]);
    $form['#title'] = $form_title;

    if ($field_storage->isLocked()) {
      $form['locked'] = [
        '#markup' => $this->t('The field %field is locked and cannot be edited.', ['%field' => $this->entity->getLabel()]),
      ];
      return $form;
    }

    // Build the configurable field values.
    $form['label'] = [
      '#type' => 'textfield',
      '#title' => $this->t('Label'),
      '#default_value' => $this->entity->getLabel() ?: $field_storage->getName(),
      '#required' => TRUE,
      '#weight' => -20,
    ];

    $form['description'] = [
      '#type' => 'textarea',
      '#title' => $this->t('Help text'),
      '#default_value' => $this->entity->getDescription(),
      '#rows' => 5,
      '#description' => $this->t('Instructions to present to the user below this field on the editing form.<br />Allowed HTML tags: @tags', ['@tags' => FieldFilteredMarkup::displayAllowedTags()]) . '<br />' . $this->t('This field supports tokens.'),
      '#weight' => -10,
    ];

    $form['required'] = [
      '#type' => 'checkbox',
      '#title' => $this->t('Required field'),
      '#default_value' => $this->entity->isRequired(),
      '#weight' => -5,
    ];

    // Create an arbitrary entity object (used by the 'default value' widget).
    $ids = (object) [
      'entity_type' => $this->entity->getTargetEntityTypeId(),
      'bundle' => $this->entity->getTargetBundle(),
      'entity_id' => NULL,
    ];
    $form['#entity'] = _field_create_entity_from_ids($ids);
    $items = $form['#entity']->get($this->entity->getName());
    $item = $items->first() ?: $items->appendItem();

    // Add field settings for the field type and a container for third party
    // settings that modules can add to via hook_form_FORM_ID_alter().
    $form['settings'] = [
      '#tree' => TRUE,
      '#weight' => 10,
    ];
    $form['settings'] += $item->fieldSettingsForm($form, $form_state);
    $form['third_party_settings'] = [
      '#tree' => TRUE,
      '#weight' => 11,
    ];

    // Add handling for default value.
    if ($element = $items->defaultValuesForm($form, $form_state)) {
      $element = array_merge($element, [
        '#type' => 'details',
        '#title' => $this->t('Default value'),
        '#open' => TRUE,
        '#tree' => TRUE,
        '#description' => $this->t('The default value for this field, used when creating new content.'),
      ]);

      $form['default_value'] = $element;
    }

    return $form;
  }

  /**
   * {@inheritdoc}
   */
  protected function actions(array $form, FormStateInterface $form_state) {
    $actions = parent::actions($form, $form_state);
    $actions['submit']['#value'] = $this->t('Save settings');

    if (!$this->entity->isNew()) {
      $target_entity_type = $this->entityManager->getDefinition($this->entity->getTargetEntityTypeId());
      $route_parameters = [
        'field_config' => $this->entity->id(),
      ] + FieldUI::getRouteBundleParameter($target_entity_type, $this->entity->getTargetBundle());
      $url = new Url('entity.field_config.' . $target_entity_type->id() . '_field_delete_form', $route_parameters);

      if ($this->getRequest()->query->has('destination')) {
        $query = $url->getOption('query');
        $query['destination'] = $this->getRequest()->query->get('destination');
        $url->setOption('query', $query);
      }
      $actions['delete'] = [
        '#type' => 'link',
        '#title' => $this->t('Delete'),
        '#url' => $url,
        '#access' => $this->entity->access('delete'),
        '#attributes' => [
          'class' => ['button', 'button--danger'],
        ],
      ];
    }

    return $actions;
  }

  /**
   * {@inheritdoc}
   */
  public function validateForm(array &$form, FormStateInterface $form_state) {
    parent::validateForm($form, $form_state);

    if (isset($form['default_value'])) {
      $item = $form['#entity']->get($this->entity->getName());
      $item->defaultValuesFormValidate($form['default_value'], $form, $form_state);
    }
  }

  /**
   * {@inheritdoc}
   */
  public function submitForm(array &$form, FormStateInterface $form_state) {
    parent::submitForm($form, $form_state);

    // Handle the default value.
    $default_value = [];
    if (isset($form['default_value'])) {
      $items = $form['#entity']->get($this->entity->getName());
      $default_value = $items->defaultValuesFormSubmit($form['default_value'], $form, $form_state);
    }
    $this->entity->setDefaultValue($default_value);
  }

  /**
   * {@inheritdoc}
   */
  public function save(array $form, FormStateInterface $form_state) {
    $this->entity->save();

    $this->messenger()->addStatus($this->t('Saved %label configuration.', ['%label' => $this->entity->getLabel()]));

    $request = $this->getRequest();
    if (($destinations = $request->query->get('destinations')) && $next_destination = FieldUI::getNextDestination($destinations)) {
      $request->query->remove('destinations');
      $form_state->setRedirectUrl($next_destination);
    }
    else {
      $form_state->setRedirectUrl(FieldUI::getOverviewRouteInfo($this->entity->getTargetEntityTypeId(), $this->entity->getTargetBundle()));
    }
  }

  /**
   * The _title_callback for the field settings form.
   *
   * @param \Drupal\field\FieldConfigInterface $field_config
   *   The field.
   *
   * @return string
   *   The label of the field.
   */
  public function getTitle(FieldConfigInterface $field_config) {
    return $field_config->label();
  }

}