<?php

/**
 * @file
 * Enables the creation of webforms and questionnaires.
 */

use Drupal\Component\Utility\Unicode;
use Drupal\Component\Serialization\Json;
use Drupal\Core\Access\AccessResult;
use Drupal\Core\Asset\AttachedAssetsInterface;
use Drupal\Core\Breadcrumb\Breadcrumb;
use Drupal\Core\Database\Query\AlterableInterface;
use Drupal\Core\Render\Element;
use Drupal\Core\Render\Markup;
use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\Core\Session\AccountInterface;
use Drupal\Core\Url;
use Drupal\file\FileInterface;
use Drupal\webform\Entity\Webform;
use Drupal\webform\Entity\WebformSubmission;
use Drupal\webform\Element\WebformMessage;
use Drupal\webform\Plugin\WebformElement\ManagedFile;
use Drupal\webform\Utility\WebformArrayHelper;
use Drupal\webform\Utility\WebformElementHelper;
use Drupal\webform\Utility\WebformDialogHelper;
use Drupal\webform\Utility\WebformOptionsHelper;
use Drupal\webform\WebformInterface;
use Drupal\webform\WebformSubmissionForm;

require_once __DIR__ . '/includes/webform.date.inc';
require_once __DIR__ . '/includes/webform.libraries.inc';
require_once __DIR__ . '/includes/webform.options.inc';
require_once __DIR__ . '/includes/webform.theme.inc';
require_once __DIR__ . '/includes/webform.translation.inc';
require_once __DIR__ . '/includes/webform.editor.inc';

/**
 * Implements hook_help().
 */
function webform_help($route_name, RouteMatchInterface $route_match) {
  // Get path from route match.
  $path = preg_replace('/^' . preg_quote(base_path(), '/') . '/', '/', Url::fromRouteMatch($route_match)->setAbsolute(FALSE)->toString());
  if (!in_array($route_name, ['system.modules_list', 'update.status']) && strpos($route_name, 'webform') === FALSE && strpos($path, '/webform') === FALSE) {
    return NULL;
  }

  /** @var \Drupal\webform\WebformHelpManagerInterface $help_manager */
  $help_manager = \Drupal::service('webform.help_manager');
  if ($route_name == 'help.page.webform') {
    $build = $help_manager->buildIndex();
  }
  else {
    $build = $help_manager->buildHelp($route_name, $route_match);
  }

  if ($build) {
    $renderer = \Drupal::service('renderer');
    $config = \Drupal::config('webform.settings');
    $renderer->addCacheableDependency($build, $config);
    return $build;
  }
  else {
    return NULL;
  }
}

/**
 * Implements hook_webform_message_custom().
 */
function webform_webform_message_custom($operation, $id) {
  if (strpos($id, 'webform_help_notification__') === 0 && $operation === 'close') {
    $id = str_replace('webform_help_notification__', '', $id);
    /** @var \Drupal\webform\WebformHelpManagerInterface $help_manager */
    $help_manager = \Drupal::service('webform.help_manager');
    $help_manager->deleteNotification($id);
  }
}

/**
 * Implements hook_modules_installed().
 */
function webform_modules_installed($modules) {
  // Add webform paths when the path.module is being installed.
  if (in_array('path', $modules)) {
    /** @var \Drupal\webform\WebformInterface[] $webforms */
    $webforms = Webform::loadMultiple();
    foreach ($webforms as $webform) {
      $webform->updatePaths();
    }
  }

  // Check HTML email provider support as modules are installed.
  /** @var \Drupal\webform\WebformEmailProviderInterface $email_provider */
  $email_provider = \Drupal::service('webform.email_provider');
  $email_provider->check();
}

/**
 * Implements hook_modules_uninstalled().
 */
function webform_modules_uninstalled($modules) {
  // Remove uninstalled module's third party settings from admin settings.
  $config = \Drupal::configFactory()->getEditable('webform.settings');
  $third_party_settings = $config->get('third_party_settings');

  $has_third_party_settings = FALSE;
  foreach ($modules as $module) {
    if (isset($third_party_settings[$module])) {
      $has_third_party_settings = TRUE;
      unset($third_party_settings[$module]);
    }
  }
  if ($has_third_party_settings) {
    $config->set('third_party_settings', $third_party_settings);
    $config->save();
  }

  // Check HTML email provider support as modules are ininstalled.
  /** @var \Drupal\webform\WebformEmailProviderInterface $email_provider */
  $email_provider = \Drupal::service('webform.email_provider');
  $email_provider->check();
}

/**
 * Implements hook_user_login().
 */
function webform_user_login($account) {
  // Notify the storage of this log in.
  \Drupal::entityTypeManager()->getStorage('webform_submission')->userLogin($account);
}

/**
 * Implements hook_cron().
 */
function webform_cron() {
  $config = \Drupal::config('webform.settings');
  \Drupal::entityTypeManager()->getStorage('webform_submission')->purge($config->get('purge.cron_size'));
}

/**
 * Implements hook_local_tasks_alter().
 */
function webform_local_tasks_alter(&$local_tasks) {
  // Change config translation local task hierarchy.
  if (isset($local_tasks['config_translation.local_tasks:entity.webform.config_translation_overview'])) {
    $local_tasks['config_translation.local_tasks:entity.webform.config_translation_overview']['base_route'] = 'entity.webform.canonical';
  }
  if (isset($local_tasks['config_translation.local_tasks:config_translation.item.overview.webform.config'])) {
    $local_tasks['config_translation.local_tasks:config_translation.item.overview.webform.config']['parent_id'] = 'webform.config';
  }

  // Disable 'Contribute' tab if explicitly disabled or the Contribute module
  // is installed.
  if (\Drupal::config('webform.settings')->get('ui.contribute_disabled') || \Drupal::moduleHandler()->moduleExists('contribute')) {
    unset($local_tasks['webform.contribute']);
  }
}

/**
 * Implements hook_menu_local_tasks_alter().
 */
function webform_menu_local_tasks_alter(&$data, $route_name) {
  // Change 'Translate *' tab to be just label 'Translate'.
  if (isset($data['tabs'][0]['config_translation.local_tasks:entity.webform.config_translation_overview']['#link']['title'])) {
    $data['tabs'][0]['config_translation.local_tasks:entity.webform.config_translation_overview']['#link']['title'] = t('Translate');
  }
  if (isset($data['tabs'][1]['config_translation.local_tasks:config_translation.item.overview.webform.config'])) {
    $data['tabs'][1]['config_translation.local_tasks:config_translation.item.overview.webform.config']['#link']['title'] = t('Translate');
  }

  // ISSUE:
  // Devel routes do not use 'webform' parameter which throws the below error.
  // Some mandatory parameters are missing ("webform") to generate a URL for
  // route "entity.webform_submission.canonical"
  //
  // WORKAROUND:
  // Make sure webform parameter is set for all routes.
  if (strpos($route_name, 'entity.webform_submission.devel_') === 0 || $route_name === 'entity.webform_submission.token_devel') {
    foreach ($data['tabs'] as $tab_level) {
      foreach ($tab_level as $tab) {
        /** @var Drupal\Core\Url $url */
        $url = $tab['#link']['url'];
        $tab_route_name = $url->getRouteName();
        $tab_route_parameters = $url->getRouteParameters();

        if (strpos($tab_route_name, 'entity.webform_submission.devel_') !== 0) {
          $webform_submission = WebformSubmission::load($tab_route_parameters['webform_submission']);
          $url->setRouteParameter('webform', $webform_submission->getWebform()->id());
        }
      }
    }
  }
}

/**
 * Implements hook_module_implements_alter().
 */
function webform_module_implements_alter(&$implementations, $hook) {
  if ($hook == 'form_alter') {
    $implementation = $implementations['webform'];
    unset($implementations['webform']);
    $implementations['webform'] = $implementation;
  }
}

/**
 * Implements hook_form_alter().
 */
function webform_form_alter(&$form, FormStateInterface $form_state, $form_id) {
  if (strpos($form_id, 'webform_') === FALSE || strpos($form_id, 'node_') === 0) {
    return;
  }

  // Get form object.
  $form_object = $form_state->getFormObject();

  // Alter the webform submission form.
  if (strpos($form_id, 'webform_submission') === 0
    && $form_object instanceof WebformSubmissionForm) {
    // Make sure webform libraries are always attached to submission form.
    _webform_page_attachments($form);

    // After build.
    $form['#after_build'][] = '_webform_form_webform_submission_form_after_build';
  }

  // Display editing original language warning.
  if (\Drupal::moduleHandler()->moduleExists('config_translation') && preg_match('/^entity.webform.(?:edit|settings|assets|access|handlers|third_party_settings)_form$/', \Drupal::routeMatch()->getRouteName())) {
    /** @var \Drupal\webform\WebformInterface $webform */
    $webform = \Drupal::routeMatch()->getParameter('webform');
    /** @var \Drupal\Core\Language\LanguageManagerInterface $language_manager */
    $language_manager = \Drupal::service('language_manager');

    // If current webform is translated, load the base (default) webform and apply
    // the translation to the elements.
    if ($webform->getLangcode() != $language_manager->getCurrentLanguage()->getId()) {
      $original_language = $language_manager->getLanguage($webform->getLangcode());
      $form['langcode_message'] = [
        '#type' => 'webform_message',
        '#message_type' => 'warning',
        '#message_message' => t('You are editing the original %language language for this webform.', ['%language' => $original_language->getName()]),
        '#message_close' => TRUE,
        '#message_storage' => WebformMessage::STORAGE_LOCAL,
        '#message_id' => $webform->id() . '.original_language',
        '#weight' => -100,
      ];
    }
  }

  // Add details 'toggle all' to all webforms (except submission forms).
  if (!($form_object instanceof WebformSubmissionForm)) {
    $form['#attributes']['class'][] = 'js-webform-details-toggle';
    $form['#attributes']['class'][] = 'webform-details-toggle';
    $form['#attached']['library'][] = 'webform/webform.element.details.toggle';
    return;
  }
}

/**
 * Alter webform after build.
 */
function _webform_form_webform_submission_form_after_build($form, FormStateInterface $form_state) {
  $form_object = $form_state->getFormObject();

  /** @var \Drupal\webform\WebformSubmissionInterface $webform_submission */
  $webform_submission = $form_object->getEntity();
  $webform = $webform_submission->getWebform();

  // Add contextual links and change theme wrapper to webform.html.twig
  // which includes 'title_prefix' and 'title_suffix' variables needed for
  // contextual links to appear.
  $form['#contextual_links']['webform'] = [
    'route_parameters' => ['webform' => $webform->id()],
  ];
  $form['#theme_wrappers'] = ['webform'];
  return $form;
}

/**
 * Implements hook_form_FORM_ID_alter().
 *
 * Add warnings when attempting to update the Webform module using
 * the 'Update manager'.
 *
 * @see https://www.drupal.org/project/webform/issues/2930116
 * @see https://www.drupal.org/project/webform/issues/2920095
 */
function webform_form_update_manager_update_form_alter(&$form, FormStateInterface $form_state) {
  if (!isset($form['projects']) || !isset($form['projects']['#options']['webform'])) {
    return;
  }

  // Display dismissible warning at the top of the page.
  $t_args = [
    ':href_manual' => 'https://www.drupal.org/docs/user_guide/en/extend-manual-install.html',
    ':href_drush' => 'https://www.drupal.org/docs/user_guide/en/security-update-module.html',
  ];
  $form['webform_update_manager_warning'] = [
    '#type' => 'webform_message',
    '#message_type' => 'warning',
    '#message_message' => t('The Webform module may not update properly using this administrative interface. It is strongly recommended that you update the Webform module <a href=":href_manual">manually</a> or by using <a href=":href_drush">Drush</a>.', $t_args),
    '#message_close' => TRUE,
    '#message_storage' => WebformMessage::STORAGE_SESSION,
    '#weight' => -10,
  ];

  // Display warning to backup site when webform is checked.
  $form['projects']['#options']['webform']['title']['data'] = [
    'title' => $form['projects']['#options']['webform']['title']['data'],
    'container' => [
      '#type' => 'container',
      '#states' => ['visible' => [':input[name="projects[webform]"]' => ['checked' => TRUE]]],
      '#attributes' => ['class' => ['js-form-wrapper'], 'style' => 'display:none'],
      'message' => [
        '#type' => 'webform_message',
        '#message_type' => 'warning',
        '#message_message' => t('Please make sure to backup your website before updating the Webform module.'),
      ],
    ],
  ];
}

/**
 * Implements hook_form_FORM_ID_alter().
 */
function webform_form_views_exposed_form_alter(&$form, FormStateInterface $form_state, $form_id) {
  /** @var \Drupal\views\ViewExecutable $view */
  $view = $form_state->get('view');

  // Check if this a is webform submission view.
  // @see \Drupal\webform\WebformSubmissionListBuilder::buildSubmissionViews
  if (isset($view->webform_submission_view)) {
    $form['#action'] = Url::fromRoute(\Drupal::routeMatch()->getRouteName(), \Drupal::routeMatch()->getRawParameters()->all())->toString();
  }
}

/**
 * Implements hook_system_breadcrumb_alter().
 */
function webform_system_breadcrumb_alter(Breadcrumb &$breadcrumb, RouteMatchInterface $route_match, array $context) {
  // Remove 'Webforms' prefix from breadcrumb links generated path breadcrumbs.
  // @see \Drupal\system\PathBasedBreadcrumbBuilder
  $path = Url::fromRouteMatch($route_match)->toString();
  if (strpos($path, '/admin/structure/webform/config/') !== FALSE) {
    $links = $breadcrumb->getLinks();
    foreach ($links as $link) {
      $text = $link->getText();
      if (strpos($text, ((string) t('Webforms')) . ' ') == 0) {
        $text = str_replace(((string) t('Webforms')) . ': ', '', $text);
        $link->setText(Unicode::ucfirst($text));
      }
    }
  }

  // Fix 'Help' breadcrumb text.
  if ($route_match->getRouteName() == 'webform.help.video') {
    $links = $breadcrumb->getLinks();
    $link = end($links);
    $link->setText(t('Webforms'));
  }
}

/**
 * Implements hook_token_info_alter().
 */
function webform_token_info_alter(&$data) {
  // Append token suffixes to all webform token descriptions.
  // @see \Drupal\webform\WebformTokenManager::replace
  $token_suffixes = '<br/>' . t('Append the below suffixes to alter the returned value.') .
    '<ul>' .
    '<li>' . t('<code>:clear</code> to removes token when not replaced.') . '</li>' .
    '<li>' . t('<code>:urlencode</code> URL encodes returned value.') . '</li>' .
    '<li>' . t('<code>:htmldecode</code> decodes HTML enities in returned value.') . '<br/><b>' . t('This suffix has security implications.') . '</b><br/>' . t('Use <code>:htmldecode</code> with <code>:striptags</code>.') . '</li>' .
    '<li>' . t('<code>:striptags</code> removes all HTML tags from returned value.') . '</li>' .
  '</ul>';

  foreach ($data['types'] as $type => &$info) {
    if (strpos($type, 'webform') === 0) {
      $info['description'] = Markup::create($info['description'] . ' ' . $token_suffixes);
    }
  }
}

/**
 * Implements hook_entity_delete().
 */
function webform_entity_delete(EntityInterface $entity) {
  /** @var \Drupal\webform\WebformEntityReferenceManagerInterface $entity_reference_manager */
  $entity_reference_manager = \Drupal::service('webform.entity_reference_manager');

  // Delete saved export settings for a webform or source entity with the
  // webform field.
  if (($entity instanceof WebformInterface) || $entity_reference_manager->hasField($entity)) {
    $name = 'webform.export.' . $entity->getEntityTypeId() . '.' . $entity->id();
    \Drupal::state()->delete($name);
  }
}

/**
 * Implements hook_mail().
 */
function webform_mail($key, &$message, $params) {
  // Never send emails when using devel generate to create 1000's of
  // submissions.
  if (\Drupal::moduleHandler()->moduleExists('devel_generate')
    && \Drupal\webform\Plugin\DevelGenerate\WebformSubmissionDevelGenerate::isGeneratingSubmissions()) {
    $message['send'] = FALSE;
  }

  // Set default parameters.
  $params += [
    'from_mail' => '',
    'from_name' => '',
    'cc_mail' => '',
    'bcc_mail' => '',
    'reply_to' => '',
    'return_path' => '',
    'sender_mail' => '',
    'sender_name' => '',
  ];

  $message['subject'] = $params['subject'];
  $message['body'][] = $params['body'];

  // Set the header 'From'.
  // Usingthe 'from_mail' so that the webform's email from value is used
  // instead of site's email address.
  // @see: \Drupal\Core\Mail\MailManager::mail.
  if (!empty($params['from_mail'])) {
    $message['from'] = $message['headers']['From'] = (!empty($params['from_name'])) ? Unicode::mimeHeaderEncode($params['from_name'], TRUE) . ' <' . $params['from_mail'] . '>' : $params['from_mail'];
  }

  // Set header 'Cc'.
  if (!empty($params['cc_mail'])) {
    $message['headers']['Cc'] = $params['cc_mail'];
  }

  // Set header 'Bcc'.
  if (!empty($params['bcc_mail'])) {
    $message['headers']['Bcc'] = $params['bcc_mail'];
  }

  // Set header 'Reply-to'.
  $reply_to = $params['reply_to'] ?: '';
  if (empty($reply_to) && !empty($params['from_mail'])) {
    // @todo Determine if the 'reply-to' must only be the to 'from mail' if 'from mail' has the same domain as the 'site mail'.
    $reply_to = $message['from'];
  }
  if ($reply_to) {
    $message['reply-to'] = $message['headers']['Reply-to'] = $reply_to;
  }

  // Set header 'Return-Path'.
  $return_path = $params['return_path'] ?: $params['from_mail'] ?: '';
  if ($return_path) {
    $message['headers']['Sender'] = $message['headers']['Return-Path'] = $return_path;
  }

  // Set header 'Sender'.
  $sender_mail = $params['sender_mail'] ?: '';
  $sender_name = $params['sender_name'] ?: $params['from_name'] ?: '';
  if ($sender_mail) {
    $message['headers']['Sender'] = ($sender_name) ? Unicode::mimeHeaderEncode($sender_name, TRUE) . ' <' . $sender_mail . '>' : $sender_mail;
  }
}

/**
 * Implements hook_mail_alter().
 */
function webform_mail_alter(&$message) {
  // Drupal hardcodes all mail header as 'text/plain' so we need to set the
  // header's 'Content-type' to HTML if the EmailWebformHandler's
  // 'html' flag has been set.
  // @see \Drupal\Core\Mail\MailManager::mail()
  // @see \Drupal\webform\Plugin\WebformHandler\EmailWebformHandler::getMessage().
  if (strpos($message['id'], 'webform') === 0) {
    if (isset($message['params']['html']) && $message['params']['html']) {
      $message['headers']['Content-Type'] = 'text/html; charset=UTF-8; format=flowed';
    }
  }
}

/**
 * Implements hook_page_attachments().
 */
function webform_page_attachments(array &$attachments) {
  $route_name = \Drupal::routeMatch()->getRouteName();
  $url = Url::fromRoute('<current>')->toString();

  // Attach global libraries only to webform specific pages.
  if (preg_match('/^(webform\.|^entity\.([^.]+\.)?webform)/', $route_name) || preg_match('#(/node/add/webform|/admin/help/webform)#', $url)) {
    _webform_page_attachments($attachments);
  }

  // Attach codemirror and select2 library to block admin to ensure that the
  // library is loaded by the webform block is placed using Ajax.
  if (strpos($route_name, 'block.admin_display') === 0) {
    $attachments['#attached']['library'][] = 'webform/webform.block';
  }

  // Attach 'Contribute' section style.
  if (\Drupal::routeMatch()->getRouteName() === 'webform.contribute') {
    /** @var \Drupal\webform\WebformContributeManagerInterface $contribute_manager */
    $contribute_manager = \Drupal::service('webform.contribute_manager');
    $attachments['#attached']['html_head'][] = [
      [
        '#type' => 'html_tag',
        '#tag' => 'style',
        '#value' => $contribute_manager->getStyle(),
      ],
      'webform_contribute',
    ];
  }

  // Attach webform dialog library and options to every page.
  if (\Drupal::config('webform.settings')->get('settings.dialog')) {
    $attachments['#attached']['library'][] = 'webform/webform.dialog';
    $attachments['#attached']['drupalSettings']['webform']['dialog']['options'] = \Drupal::config('webform.settings')->get('settings.dialog_options');

    /** @var \Drupal\webform\WebformRequestInterface $request_handler */
    $request_handler = \Drupal::service('webform.request');
    if ($source_entity = $request_handler->getCurrentSourceEntity()) {
      $attachments['#attached']['drupalSettings']['webform']['dialog']['entity_type'] = $source_entity->getEntityTypeId();
      $attachments['#attached']['drupalSettings']['webform']['dialog']['entity_id'] = $source_entity->id();
    }
  }
}

/**
 * Add webform libraries to page attachments.
 *
 * @param array $attachments
 *   An array of page attachments.
 */
function _webform_page_attachments(array &$attachments) {
  /** @var \Drupal\webform\WebformThemeManagerInterface $theme_manager */
  $theme_manager = \Drupal::service('webform.theme_manager');
  $active_theme_names = $theme_manager->getActiveThemeNames();
  foreach ($active_theme_names as $active_theme_name) {
    if (file_exists(drupal_get_path('module', 'webform') . "/css/webform.theme.$active_theme_name.css")) {
      $attachments['#attached']['library'][] = "webform/webform.theme.$active_theme_name";
    }
  }

  // Attach webform contextual link helper.
  if (\Drupal::currentUser()->hasPermission('access contextual links')) {
    $attachments['#attached']['library'][] = 'webform/webform.contextual';
  }

  // Attach details element save open/close library.
  // This ensures pages without a webform will still be able to save the
  // details element state.
  if (\Drupal::config('webform.settings')->get('ui.details_save')) {
    $attachments['#attached']['library'][] = 'webform/webform.element.details.save';
  }

  // Assets: Add custom shared and webform specific CSS and JS.
  // @see webform_library_info_build()
  /** @var \Drupal\webform\WebformRequestInterface $request_handler */
  $request_handler = \Drupal::service('webform.request');
  if ($webform = $request_handler->getCurrentWebform()) {
    $assets = $webform->getAssets();
    foreach ($assets as $type => $value) {
      if ($value) {
        $attachments['#attached']['library'][] = 'webform/webform.' . $type . '.' . $webform->id();
      }
    }
  }
}

/**
 * Implements hook_library_info_build().
 */
function webform_library_info_build() {
  $base_path = base_path();
  $default_query_string = \Drupal::state()->get('system.css_js_query_string') ?: '0';

  /** @var \Drupal\webform\WebformInterface[] $webforms */
  $webforms = Webform::loadMultiple();
  $libraries = [];
  foreach ($webforms as $webform_id => $webform) {
    $assets = array_filter($webform->getAssets());
    foreach ($assets as $type => $value) {
      // Note:
      // Set 'type' to 'external' and manually build the CSS/JS file path
      // to prevent JS from being parsed by locale_js_alter()
      // @see locale_js_alter()
      // @see https://www.drupal.org/node/1803330
      $settings = ['type' => 'external', 'preprocess' => FALSE, 'minified' => FALSE];
      if ($type === 'css') {
        $libraries["webform.css.$webform_id"] = [
          'css' => ['theme' => ["{$base_path}webform/css/{$webform_id}?{$default_query_string}" => $settings]],
        ];
      }
      else {
        $libraries["webform.javascript.$webform_id"] = [
          'js' => ["{$base_path}webform/javascript/{$webform_id}?{$default_query_string}" => $settings],
        ];
      }
    }
  }
  return $libraries;
}

/**
 * Implements hook_css_alter().
 */
function webform_css_alter(&$css, AttachedAssetsInterface $assets) {
  // Remove the stable.theme's off-canvas CSS reset for webform admin routes.
  // @see https://www.drupal.org/project/drupal/issues/2826722
  //
  // NOTE: Most admin themes correct style jQuery UI dialogs because Drupal's
  // admin UI, especially Views, relies on them.
  $use_off_canvas = WebformDialogHelper::useOffCanvas();
  $is_admin_route = \Drupal::service('router.admin_context')->isAdminRoute();
  $is_webform_route = preg_match('/(^webform|^entity\.webform|^entity\.node\.webform)/', \Drupal::routeMatch()->getRouteName());
  if ($use_off_canvas && $is_admin_route && $is_webform_route) {
    foreach ($css as $key => $item) {
      if (strpos($key, 'core/themes/stable/css/core/dialog/off-canvas') === 0) {
        unset($css[$key]);
      }
    }
  }

  _webform_asset_alter($css, 'css');
}

/**
 * Implements hook_js_alter().
 */
function webform_js_alter(&$javascript, AttachedAssetsInterface $assets) {
  // Add Google API key required by webform/libraries.jquery.geocomplete
  // which is dependency for webform/webform.element.location.geocomplete.
  //
  // @see \Drupal\webform\Element\WebformLocationGeocomplete::processWebformComposite
  // @see webform.libraries.yml
  // @see webform/webform.element.location.geocomplete
  // @see webform/libraries.jquery.geocomplete
  $settings = $assets->getSettings();
  if (!empty($settings['webform']['location']['geocomplete']['api_key']) && isset($javascript['https://maps.googleapis.com/maps/api/js?key=API_KEY&libraries=places'])) {
    $api_key = $settings['webform']['location']['geocomplete']['api_key'];
    $javascript['https://maps.googleapis.com/maps/api/js?key=API_KEY&libraries=places']['data'] = "https://maps.googleapis.com/maps/api/js?key=$api_key&libraries=places";
    unset($settings['webform']['location']['geocomplete']['api_key']);
    $assets->setSettings($settings);
  }

  _webform_asset_alter($javascript, 'javascript');
}

/**
 * Alter Webform CSS or JavaScript assets and make sure they appear last.
 *
 * @param array $items
 *   An array of all CSS or JavaScript being presented on the page.
 * @param string $type
 *   The type of asset being attached.
 *
 * @see hook_library_info_build()
 */
function _webform_asset_alter(array &$items, $type) {
  foreach ($items as $key => &$item) {
    if (strpos($key, "webform/$type/") === 0) {
      $item['weight'] = 1000;
      $item['group'] = 1000;
    }
  }
}

/**
 * Implements hook_file_access().
 *
 * @see file_file_download()
 * @see webform_preprocess_file_link()
 */
function webform_file_access(FileInterface $file, $operation, AccountInterface $account) {
  // Block access to temporary anonymous private file uploads.
  if ($operation == 'download' && $file->isTemporary() && $file->getOwnerId() == 0 && strpos($file->getFileUri(), 'private://webform/') === 0) {
    return AccessResult::forbidden();
  }
  return AccessResult::neutral();
}

/**
 * Implements hook_file_download().
 */
function webform_file_download($uri) {
  return ManagedFile::accessFileDownload($uri);
}

/**
 * Implements hook_contextual_links_view_alter().
 *
 * Add .webform-contextual class to all webform context links.
 *
 * @see webform.links.contextual.yml
 * @see js/webform.contextual.js
 */
function webform_contextual_links_view_alter(&$element, $items) {
  $links = [
    'entitywebformtest-form',
    'entitywebformresults-submissions',
    'entitywebformedit-form',
    'entitywebformsettings',
  ];
  foreach ($links as $link) {
    if (isset($element['#links'][$link])) {
      $element['#links'][$link]['attributes']['class'][] = 'webform-contextual';
    }
  }
}

/**
 * Implements hook_webform_access_rules().
 */
function webform_webform_access_rules() {
  return [
    'create' => [
      'title' => t('Create submissions'),
      'roles' => [
        'anonymous',
        'authenticated',
      ],
    ],
    'view_any' => [
      'title' => t('View any submissions'),
    ],
    'update_any' => [
      'title' => t('Update any submissions'),
    ],
    'delete_any' => [
      'title' => t('Delete any submissions'),
    ],
    'purge_any' => [
      'title' => t('Purge any submissions'),
    ],
    'view_own' => [
      'title' => t('View own submissions'),
    ],
    'update_own' => [
      'title' => t('Update own submissions'),
    ],
    'delete_own' => [
      'title' => t('Delete own submissions'),
    ],
    'administer' => [
      'title' => t('Administer webform & submissions'),
      'description' => [
        '#type' => 'webform_message',
        '#message_type' => 'warning',
        '#message_message' => t('<strong>Warning</strong>: The below settings give users, permissions, and roles full access to this webform and its submissions.'),
      ],
    ],
    'test' => [
      'title' => t('Test webform'),
    ],
    'configuration' => [
      'title' => t('Access webform configuration'),
      'description' => [
        '#type' => 'webform_message',
        '#message_type' => 'warning',
        '#message_message' => t("<strong>Warning</strong>: The below settings give users, permissions, and roles full access to this webform's configuration via API requests."),
      ],
    ],
  ];
}

/**
 * Adds JavaScript to change the state of an element based on another element.
 *
 * @param array $elements
 *   A renderable array element having a #states property as described above.
 * @param string $key
 *   The element property to add the states attribute to.
 *
 * @see drupal_process_states()
 */
function webform_process_states(array &$elements, $key = '#attributes') {
  if (empty($elements['#states'])) {
    return;
  }

  $elements['#attached']['library'][] = 'core/drupal.states';
  $elements[$key]['data-drupal-states'] = Json::encode($elements['#states']);
  // Make sure to include target class for this container.
  if (empty($elements[$key]['class']) || !WebformArrayHelper::inArray(['js-form-item', 'js-form-submit', 'js-form-wrapper'], $elements[$key]['class'])) {
    $elements[$key]['class'][] = 'js-form-item';
  }
}

/******************************************************************************/
// Element info hooks.
/******************************************************************************/

/**
 * Implements hook_element_info_alter().
 */
function webform_element_info_alter(array &$info) {
  $info['checkboxes']['#process'][] = 'webform_process_options';
  $info['radios']['#process'][] = 'webform_process_options';
}

/**
 * Process radios or checkboxes descriptions.
 *
 * @param array $element
 *   An associative array containing the properties and children of the
 *   radios or checkboxes element.
 * @param \Drupal\Core\Form\FormStateInterface $form_state
 *   The current state of the form.
 * @param array $complete_form
 *   The complete webform structure.
 *
 * @return array
 *   The processed element.
 */
function webform_process_options(&$element, FormStateInterface $form_state, &$complete_form) {
  if (!WebformElementHelper::isWebformElement($element)) {
    return $element;
  }

  if (!empty($element['#options_description_display'])) {
    $description_property_name = ($element['#options_description_display'] == 'help') ? '#help' : '#description';
    foreach (Element::children($element) as $key) {
      $title = (string) $element[$key]['#title'];
      // Check for -- delimiter.
      if (strpos($title, WebformOptionsHelper::DESCRIPTION_DELIMITER) === FALSE) {
        continue;
      }

      list($title, $description) = explode(WebformOptionsHelper::DESCRIPTION_DELIMITER, $title);
      $element[$key]['#title'] = $title;
      $element[$key]['#webform_element'] = TRUE;
      $element[$key][$description_property_name] = $description;
    }
  }

  // Issue #2839344: Some aria-describedby refers to not existing element ID.
  // @see https://www.drupal.org/project/drupal/issues/2839344
  if (!empty($element['#attributes']['aria-describedby'])) {
    foreach (Element::children($element) as $key) {
      if (empty($element[$key]['#attributes']['aria-describedby'])
        && $element['#attributes']['aria-describedby'] === $element[$key]['#attributes']['aria-describedby']) {
        unset($element[$key]['#attributes']['aria-describedby']);
      }
    }
  }

  return $element;
}

/******************************************************************************/
// Private functions.
/******************************************************************************/

/**
 * Provides custom PHP error handling when webform rendering is validated.
 *
 * Converts E_RECOVERABLE_ERROR to WARNING so that an exceptions can be thrown
 * and caught by
 * \Drupal\webform\WebformEntityElementsValidator::validateRendering().
 *
 * @param int $error_level
 *   The level of the error raised.
 * @param string $message
 *   The error message.
 * @param string $filename
 *   The filename that the error was raised in.
 * @param int $line
 *   The line number the error was raised at.
 * @param array $context
 *   An array that points to the active symbol table at the point the error
 *   occurred.
 *
 * @throws \ErrorException
 *   Throw ErrorException for E_RECOVERABLE_ERROR errors.
 *
 * @see \Drupal\webform\WebformEntityElementsValidator::validateRendering()
 */
function _webform_entity_element_validate_rendering_error_handler($error_level, $message, $filename, $line, array $context) {
  // From: http://stackoverflow.com/questions/15461611/php-try-catch-not-catching-all-exceptions
  if (E_RECOVERABLE_ERROR === $error_level) {
    // Allow Drupal to still log the error but convert it to a warning.
    _drupal_error_handler(E_WARNING, $message, $filename, $line, $context);
    throw new ErrorException($message, $error_level, 0, $filename, $line);
  }
  else {
    _drupal_error_handler($error_level, $message, $filename, $line, $context);
  }
}

/**
 * Provides custom PHP exception handling when webform rendering is validated.
 *
 * @param \Exception|\Throwable $exception
 *   The exception object that was thrown.
 *
 * @throws \Exception
 *   Throw the exception back to
 *   WebformEntityElementsValidator::validateRendering().
 *
 * @see \Drupal\webform\WebformEntityElementsValidator::validateRendering()
 */
function _webform_entity_element_validate_rendering_exception_handler($exception) {
  throw $exception;
}

/**
 * Implements hook_query_alter().
 *
 * Append EAV sort to webform_submission entity query.
 *
 * @see http://stackoverflow.com/questions/12893314/sorting-eav-database
 * @see \Drupal\webform\WebformSubmissionListBuilder::getEntityIds
 */
function webform_query_alter(AlterableInterface $query) {
  /** @var \Drupal\Core\Database\Query\SelectInterface $query */
  $name = $query->getMetaData('webform_submission_element_name');
  if (!$name) {
    return;
  }

  $direction = $query->getMetaData('webform_submission_element_direction');
  $property_name = $query->getMetaData('webform_submission_element_property_name');

  $query->distinct();
  $query->addJoin('INNER', 'webform_submission_data', NULL, 'base_table.sid = webform_submission_data.sid');
  $query->addField('webform_submission_data', 'value', 'value');
  $query->condition('name', $name);
  if ($property_name) {
    $query->condition('property', $property_name);
  }
  $query->orderBy('value', $direction);
}