<?php

/**
 * @file
 */

use Drupal\Core\Entity\FieldableEntityInterface;
use Drupal\Core\Field\FieldStorageDefinitionInterface;

/**
 * Returns the array of allowed values for a list field.
 *
 * The strings are not safe for output. Keys and values of the array should be
 * sanitized through \Drupal\Core\Field\FieldFilteredMarkup before being
 * displayed.
 *
 * @param \Drupal\Core\Field\FieldStorageDefinitionInterface $definition
 *   The field storage definition.
 * @param \Drupal\Core\Entity\FieldableEntityInterface|null $entity
 *   (optional) The specific entity when this function is called from the
 *   context of a specific field on a specific entity. This allows custom
 *   'allowed_values_function' callbacks to either restrict the values or
 *   customize the labels for particular bundles and entities. NULL when
 *   there is not a specific entity available, such as for Views filters.
 *
 * @return array
 *   The array of allowed values. Keys of the array are the raw stored values
 *   (number or text), values of the array are the display labels.
 *
 * @see callback_allowed_values_function()
 */
function options_allowed_values(FieldStorageDefinitionInterface $definition, ?FieldableEntityInterface $entity = NULL) {
  $allowed_values = &drupal_static(__FUNCTION__, []);

  $cache_keys = [$definition->getTargetEntityTypeId(), $definition->getName()];
  if ($entity) {
    $cache_keys[] = 'entity';
  }
  $cache_id = implode(':', $cache_keys);

  if (!isset($allowed_values[$cache_id])) {
    $function = $definition->getSetting('allowed_values_function');
    // If $cacheable is FALSE, then the allowed values are not statically
    // cached. See OptionsAllowedValues::dynamicValues() for an example of
    // generating dynamic and uncached values.
    $cacheable = TRUE;
    if (!empty($function)) {
      $values = $function($definition, $entity, $cacheable);
    }
    else {
      $values = $definition->getSetting('allowed_values');
    }

    if ($cacheable) {
      $allowed_values[$cache_id] = $values;
    }
    else {
      return $values;
    }
  }

  return $allowed_values[$cache_id];
}

/**
 * Checks if a list of values are being used in actual field values.
 */
function _options_values_in_use($entity_type, $field_name, $values) {
  if ($values) {
    $result = \Drupal::entityQuery($entity_type)
      ->condition($field_name . '.value', $values, 'IN')
      ->count()
      ->accessCheck(FALSE)
      ->range(0, 1)
      ->execute();
    if ($result) {
      return TRUE;
    }
  }

  return FALSE;
}