<?php

/**
 * @file
 */

use Drupal\Core\Entity\EntityFormInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Language\LanguageInterface;
use Drupal\language\Entity\ContentLanguageSettings;

/**
 * Processes a language select list form element.
 *
 * @param array $element
 *   The form element to process.
 *
 * @return array
 *   The processed form element.
 */
function language_process_language_select($element) {
  // Don't set the options if another module (translation for example) already
  // set the options.
  if (!isset($element['#options'])) {
    $element['#options'] = [];
    foreach (\Drupal::languageManager()->getLanguages($element['#languages']) as $langcode => $language) {
      $element['#options'][$langcode] = $language->isLocked() ? t('- @name -', ['@name' => $language->getName()]) : $language->getName();
    }
  }
  return $element;
}

/**
 * Submit handler for the forms that have a language_configuration element.
 */
function language_configuration_element_submit(&$form, FormStateInterface $form_state): void {
  // Iterate through all the language_configuration elements and save their
  // values.
  // In case we are editing a bundle, we must check the new bundle name,
  // because e.g. hook_ENTITY_update fired before.
  if ($language = $form_state->get('language')) {
    foreach ($language as $element_name => $values) {
      $entity_type_id = $values['entity_type'];
      $bundle = $values['bundle'];
      $form_object = $form_state->getFormObject();
      if ($form_object instanceof EntityFormInterface) {
        /** @var \Drupal\Core\Entity\EntityFormInterface $form_object */
        $entity = $form_object->getEntity();
        if ($entity->getEntityType()->getBundleOf()) {
          $bundle = $entity->id();
          $language[$element_name]['bundle'] = $bundle;
        }
      }
      $config = ContentLanguageSettings::loadByEntityTypeBundle($entity_type_id, $bundle);
      $config->setDefaultLangcode($form_state->getValue([$element_name, 'langcode']));
      $config->setLanguageAlterable($form_state->getValue([$element_name, 'language_alterable']));
      $config->save();

      // Set the form_state language with the updated bundle.
      $form_state->set('language', $language);
    }
  }
}

/**
 * Returns the default language code assigned to an entity type and a bundle.
 *
 * @param string $entity_type
 *   The entity type.
 * @param string $bundle
 *   The bundle name.
 *
 * @return string
 *   The language code.
 */
function language_get_default_langcode($entity_type, $bundle) {
  $configuration = ContentLanguageSettings::loadByEntityTypeBundle($entity_type, $bundle);

  $default_value = NULL;
  $language_interface = \Drupal::languageManager()->getCurrentLanguage();
  switch ($configuration->getDefaultLangcode()) {
    case LanguageInterface::LANGCODE_SITE_DEFAULT:
      $default_value = \Drupal::languageManager()->getDefaultLanguage()->getId();
      break;

    case 'current_interface':
      $default_value = $language_interface->getId();
      break;

    case 'authors_default':
      $user = \Drupal::currentUser();
      $language_code = $user->getPreferredLangcode();
      if (!empty($language_code)) {
        $default_value = $language_code;
      }
      else {
        $default_value = $language_interface->getId();
      }
      break;
  }
  if ($default_value) {
    return $default_value;
  }

  // If we still do not have a default value, just return the value stored in
  // the configuration; it has to be an actual language code.
  return $configuration->getDefaultLangcode();
}

/**
 * Update the list of prefixes from the installed languages.
 */
function language_negotiation_url_prefixes_update(): void {
  $config = \Drupal::configFactory()->getEditable('language.negotiation');
  $prefixes = $config->get('url.prefixes');
  foreach (\Drupal::languageManager()->getLanguages() as $language) {
    // The prefix for this language should be updated if it's not assigned yet
    // or the prefix is set to the empty string.
    if (empty($prefixes[$language->getId()])) {
      // For the default language, set the prefix to the empty string,
      // otherwise use the langcode.
      $prefixes[$language->getId()] = $language->isDefault() ? '' : $language->getId();
    }
    // Otherwise we keep the configured prefix.
  }
  $config->set('url.prefixes', $prefixes)->save(TRUE);
}

/**
 * Implements hook_preprocess_HOOK() for block templates.
 */
function language_preprocess_block(&$variables): void {
  if ($variables['configuration']['provider'] == 'language') {
    $variables['attributes']['role'] = 'navigation';
  }
}

/**
 * Returns language mappings between browser and Drupal language codes.
 *
 * @return array
 *   An array containing browser language codes as keys with corresponding
 *   Drupal language codes as values.
 */
function language_get_browser_drupal_langcode_mappings() {
  $config = \Drupal::config('language.mappings');
  if ($config->isNew()) {
    return [];
  }
  return $config->get('map');
}