<?php

/**
 * @file
 * This is the External Links module.
 */

use Drupal\Component\Utility\Html;
use Drupal\Component\Utility\Xss;
use Drupal\Core\Cache\CacheableMetadata;
use Drupal\Core\Config\Config;
use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\Core\Url;

/**
 * Implements hook_modules_installed().
 *
 * Be friendly to your users: show a message after installing the module.
 */
function extlink_modules_installed($modules, $is_syncing): void {
  if (!in_array('extlink', $modules)) {
    return;
  }

  if ($is_syncing) {
    // Don't show the message when syncing configuration.
    return;
  }

  if (defined('MAINTENANCE_MODE') && constant('MAINTENANCE_MODE') === 'install') {
    // Don't show the message during installation.
    return;
  }

  \Drupal::messenger()->addStatus(t(
    'You can now <a href=":settingsUrl">configure the External Links module</a> for your site.',
    [':settingsUrl' => Url::fromRoute('extlink_admin.settings')->toString()])
  );
}

/**
 * Implements hook_help().
 */
function extlink_help($route_name, RouteMatchInterface $arg) {
  if ($route_name == 'help.page.extlink') {
    $output = '<p>' . t('External Links is used to differentiate between internal and external links. It will find all external links on a page and add an external icon indicating it will take you offsite or a mail icon for mailto links.') . '</p>';
    return ['#markup' => $output];
  }
}

/**
 * Implements hook_page_attachments().
 */
function extlink_page_attachments(array &$attachments): void {
  $config = \Drupal::config('extlink.settings');

  // Checks to see if external link is enabled on admin routes.
  if ($config->get('extlink_exclude_admin_routes') && \Drupal::service('router.admin_context')->isAdminRoute()) {
    return;
  }

  // Add the extlink.settings config as a cacheable dependency.
  $cacheable_metadata = CacheableMetadata::createFromRenderArray($attachments);
  $cacheable_metadata->addCacheableDependency($config);
  $cacheable_metadata->applyTo($attachments);

  $attachments['#attached']['library'][] = 'extlink/drupal.extlink';

  if (!empty($config->get('extlink_use_external_js_file'))) {
    // If using an external JS file, stop here.
    return;
  }

  $attachments['#attached']['drupalSettings']['data']['extlink'] = _extlink_get_settings_from_config($config);
}

/**
 * Helper function to prepare extlink JS drupalSettings from configuration.
 *
 * @param \Drupal\Core\Config\Config $config
 *   The extlink settings config object.
 *
 * @return array
 *   Associative array of extlink settings to use as JS drupalSettings.
 */
function _extlink_get_settings_from_config(Config $config): array {
  $settings = $config->get();

  // Allow other modules to manipulate the settings.
  \Drupal::moduleHandler()->alter('extlink_settings', $settings);

  // Allow other modules to alter the excluded CSS selector settings.
  \Drupal::moduleHandler()->alter('extlink_css_exclude', $settings['extlink_css_exclude']);

  $callback = [Html::class, 'cleanCssIdentifier'];
  $fa_link_classes = $config->get('extlink_font_awesome_classes.links') ?: 'fa fa-external-link';
  $fa_link_classes = array_map($callback, explode(' ', $fa_link_classes));

  $fa_mailto_classes = $config->get('extlink_font_awesome_classes.mailto') ?: 'fa fa-envelope-o';
  $fa_mailto_classes = array_map($callback, explode(' ', $fa_mailto_classes));

  $fa_tel_classes = $config->get('extlink_font_awesome_classes.tel') ?: 'fa fa-phone';
  $fa_tel_classes = array_map($callback, explode(' ', $fa_tel_classes));

  // Additional classes:
  $additional_link_classes = $config->get('extlink_additional_link_classes') ?: '';
  $additional_link_classes = array_map($callback, explode(' ', $additional_link_classes));

  $additional_mailto_classes = $config->get('extlink_additional_mailto_classes') ?: '';
  $additional_mailto_classes = array_map($callback, explode(' ', $additional_mailto_classes));

  $additional_tel_classes = $config->get('extlink_additional_tel_classes') ?: '';
  $additional_tel_classes = array_map($callback, explode(' ', $additional_tel_classes));

  $defaultText = t('This link will take you to an external web site. We are not responsible for their content.');
  $extAlertText = $defaultText;
  if (!empty($settings['extlink_alert_text'])) {
    if (!is_array($settings['extlink_alert_text'])) {
      $extAlertText = (Xss::filterAdmin($settings['extlink_alert_text']));
    }
    else {
      $extAlertText = ((isset($settings['extlink_alert_text']['value'])) ? Html::escape($settings['extlink_alert_text']['value']) : $defaultText);
    }
  }

  return [
    'extTarget'           => ((isset($settings['extlink_target'])) ? $settings['extlink_target'] : FALSE),
    'extTargetAppendNewWindowDisplay' => ((isset($settings['extlink_target_display_default_title'])) ? $settings['extlink_target_display_default_title'] : FALSE),
    'extTargetAppendNewWindowLabel' => ((isset($settings['extlink_target_default_title_text'])) ? $settings['extlink_target_default_title_text'] : '(opens in a new window)'),
    'extTargetNoOverride' => ((isset($settings['extlink_target_no_override'])) ? $settings['extlink_target_no_override'] : FALSE),
    'extNofollow'         => ((isset($settings['extlink_nofollow'])) ? $settings['extlink_nofollow'] : FALSE),
    'extTitleNoOverride'  => ((isset($settings['extlink_title_no_override'])) ? $settings['extlink_title_no_override'] : FALSE),
    'extNoreferrer'       => ((isset($settings['extlink_noreferrer'])) ? $settings['extlink_noreferrer'] : FALSE),
    'extFollowNoOverride' => ((isset($settings['extlink_follow_no_override'])) ? $settings['extlink_follow_no_override'] : FALSE),
    'extClass'            => ((isset($settings['extlink_class'])) ? $settings['extlink_class'] : 'ext'),
    'extLabel'            => ((isset($settings['extlink_label'])) ? Html::escape($settings['extlink_label']) : t('(link is external)')),
    'extImgClass'         => ((isset($settings['extlink_img_class'])) ? $settings['extlink_img_class'] : FALSE),
    'extSubdomains'       => ((isset($settings['extlink_subdomains'])) ? $settings['extlink_subdomains'] : TRUE),
    'extExclude'          => ((isset($settings['extlink_exclude'])) ? $settings['extlink_exclude'] : ''),
    'extInclude'          => ((isset($settings['extlink_include'])) ? $settings['extlink_include'] : ''),
    'extCssExclude'       => ((isset($settings['extlink_css_exclude'])) ? $settings['extlink_css_exclude'] : ''),
    'extCssInclude'       => ((isset($settings['extlink_css_include'])) ? $settings['extlink_css_include'] : ''),
    'extCssExplicit'      => ((isset($settings['extlink_css_explicit'])) ? $settings['extlink_css_explicit'] : ''),
    'extAlert'            => ((isset($settings['extlink_alert'])) ? $settings['extlink_alert'] : FALSE),
    'extAlertText'        => $extAlertText,
    'extHideIcons'        => ((isset($settings['extlink_hide_icons'])) ? $settings['extlink_hide_icons'] : FALSE),
    'mailtoClass'         => ((isset($settings['extlink_mailto_class'])) ? $settings['extlink_mailto_class'] : 'mailto'),
    'telClass'         => ((isset($settings['extlink_tel_class'])) ? $settings['extlink_tel_class'] : 'tel'),
    'mailtoLabel'         => ((isset($settings['extlink_mailto_label'])) ? Html::escape($settings['extlink_mailto_label']) : t('(link sends email)')),
    'telLabel'         => ((isset($settings['extlink_tel_label'])) ? Html::escape($settings['extlink_tel_label']) : t('(link is a phone number)')),
    'extUseFontAwesome'   => ((isset($settings['extlink_use_font_awesome'])) ? $settings['extlink_use_font_awesome'] : FALSE),
    'extIconPlacement'    => ((!empty($settings['extlink_icon_placement'])) ? $settings['extlink_icon_placement'] : 'append'),
    'extPreventOrphan' => $settings['extlink_prevent_orphan'] ?? FALSE,
    'extFaLinkClasses'    => implode(' ', $fa_link_classes),
    'extFaMailtoClasses'  => implode(' ', $fa_mailto_classes),
    'extAdditionalLinkClasses'      => implode(' ', $additional_link_classes),
    'extAdditionalMailtoClasses'    => implode(' ', $additional_mailto_classes),
    'extAdditionalTelClasses'    => implode(' ', $additional_tel_classes),
    'extFaTelClasses'  => implode(' ', $fa_tel_classes),
    'allowedDomains'  => $config->get('allowed_domains'),
    'extExcludeNoreferrer' => $settings['extlink_exclude_noreferrer'] ?? '',
  ];
}

/**
 * Implements hook_library_info_alter().
 */
function extlink_library_info_alter(&$libraries, $extension): void {
  if (($extension === 'extlink') &&
      isset($libraries['drupal.extlink']) &&
      \Drupal::config('extlink.settings')->get('extlink_use_external_js_file')) {

    $host = \Drupal::request()->getBasePath();
    $new_key[$host . '/extlink/settings.js'] = $libraries['extlink.settings']['js']['/extlink/settings.js'];
    $libraries['extlink.settings']['js'] = $new_key;

    // Add the external settings JS file as a dependency to the drupal.extlink
    // library so that it will be loaded when configuration is set to use the
    // external file.
    $libraries['drupal.extlink']['dependencies'][] = 'extlink/extlink.settings';
  }
}