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<?php

/**
 * @file
 * Adds hreflang link elements to the header of each page.
 */

use Drupal\Core\Language\LanguageInterface;
use Drupal\Core\Url;

/**
 * Implements hook_module_implements_alter().
 */
function hreflang_module_implements_alter(&$implementations, $hook) {
  // @fixme https://www.drupal.org/project/drupal/issues/1255092
  // Content Translation module normally adds identical hreflang tags, so
  // executing its hook_page_attachments() implementation would be harmless, but
  // if an entity page is configured as the front page, it attaches extraneous
  // hreflang tags using the entity URL.
  if ($hook === 'page_attachments' && isset($implementations['content_translation'])) {
    unset($implementations['content_translation']);
  }
}

/**
 * Implements hook_page_attachments().
 */
function hreflang_page_attachments(array &$page) {
  // No need to add hreflang tags for 404/403 pages.
  if (\Drupal::request()->attributes->has('exception')) {
    return;
  }
  $language_manager = \Drupal::getContainer()->get('language_manager');
  if (!$language_manager->isMultilingual()) {
    return;
  }
  $route = \Drupal::service('path.matcher')->isFrontPage() ? '<front>' : '<current>';
  $links = $language_manager->getLanguageSwitchLinks(LanguageInterface::TYPE_INTERFACE, Url::fromRoute($route));
  if (empty($links->links)) {
    return;
  }
  foreach ($links->links as $langcode => $link) {
    if (!isset($link['query'])) {
      $link['query'] = [];
    }
    $link['query'] += \Drupal::request()->query->all();
    $link['url']->setOptions($link);
    $link['url']->setAbsolute();
    $page['#attached']['html_head_link'][] = [
      [
        'rel' => 'alternate',
        'hreflang' => $langcode,
        'href' => $link['url']->toString(),
      ],
      TRUE,
    ];
  }
}