class CommentTokensHooks

class CommentTokensHooks {
    
    /**
     * Implements hook_token_info().
     */
    public function tokenInfo() {
        $type = [
            'name' => t('Comments'),
            'description' => t('Tokens for comments posted on the site.'),
            'needs-data' => 'comment',
        ];
        $tokens = [];
        // Provides an integration for each entity type except comment.
        foreach (\Drupal::entityTypeManager()->getDefinitions() as $entity_type_id => $entity_type) {
            if ($entity_type_id == 'comment' || !$entity_type->entityClassImplements(ContentEntityInterface::class)) {
                continue;
            }
            if (\Drupal::service('comment.manager')->getFields($entity_type_id)) {
                // Get the correct token type.
                $token_type = $entity_type_id == 'taxonomy_term' ? 'term' : $entity_type_id;
                // @todo Make this work per field. See https://www.drupal.org/node/2031903.
                $tokens[$token_type]['comment-count'] = [
                    'name' => t("Comment count"),
                    'description' => t("The number of comments posted on an entity."),
                ];
                $tokens[$token_type]['comment-count-new'] = [
                    'name' => t("New comment count"),
                    'description' => t("The number of comments posted on an entity since the reader last viewed it."),
                ];
            }
        }
        // Core comment tokens
        $comment['cid'] = [
            'name' => t("Comment ID"),
            'description' => t("The unique ID of the comment."),
        ];
        $comment['uuid'] = [
            'name' => t('UUID'),
            'description' => t("The UUID of the comment."),
        ];
        $comment['hostname'] = [
            'name' => t("IP Address"),
            'description' => t("The IP address of the computer the comment was posted from."),
        ];
        $comment['mail'] = [
            'name' => t("Email address"),
            'description' => t("The email address left by the comment author."),
        ];
        $comment['homepage'] = [
            'name' => t("Home page"),
            'description' => t("The home page URL left by the comment author."),
        ];
        $comment['title'] = [
            'name' => t("Title"),
            'description' => t("The title of the comment."),
        ];
        $comment['body'] = [
            'name' => t("Content"),
            'description' => t("The formatted content of the comment itself."),
        ];
        $comment['langcode'] = [
            'name' => t('Language code'),
            'description' => t('The language code of the language the comment is written in.'),
        ];
        $comment['url'] = [
            'name' => t("URL"),
            'description' => t("The URL of the comment."),
        ];
        $comment['edit-url'] = [
            'name' => t("Edit URL"),
            'description' => t("The URL of the comment's edit page."),
        ];
        // Chained tokens for comments
        $comment['created'] = [
            'name' => t("Date created"),
            'description' => t("The date the comment was posted."),
            'type' => 'date',
        ];
        $comment['changed'] = [
            'name' => t("Date changed"),
            'description' => t("The date the comment was most recently updated."),
            'type' => 'date',
        ];
        $comment['parent'] = [
            'name' => t("Parent"),
            'description' => t("The comment's parent, if comment threading is active."),
            'type' => 'comment',
        ];
        $comment['entity'] = [
            'name' => t("Entity"),
            'description' => t("The entity the comment was posted to."),
            'type' => 'entity',
        ];
        $comment['author'] = [
            'name' => t("Author"),
            'description' => t("The author name of the comment."),
            'type' => 'user',
        ];
        return [
            'types' => [
                'comment' => $type,
            ],
            'tokens' => [
                'comment' => $comment,
            ] + $tokens,
        ];
    }
    
    /**
     * Implements hook_tokens().
     */
    public function tokens($type, $tokens, array $data, array $options, BubbleableMetadata $bubbleable_metadata) {
        $token_service = \Drupal::token();
        $url_options = [
            'absolute' => TRUE,
        ];
        if (isset($options['langcode'])) {
            $url_options['language'] = \Drupal::languageManager()->getLanguage($options['langcode']);
            $langcode = $options['langcode'];
        }
        else {
            $langcode = NULL;
        }
        $replacements = [];
        if ($type == 'comment' && !empty($data['comment'])) {
            
            /** @var \Drupal\comment\CommentInterface $comment */
            $comment = $data['comment'];
            foreach ($tokens as $name => $original) {
                switch ($name) {
                    // Simple key values on the comment.
                    case 'cid':
                        $replacements[$original] = $comment->id();
                        break;
                    case 'uuid':
                        $replacements[$original] = $comment->uuid();
                        break;
                    // Poster identity information for comments.
                    case 'hostname':
                        $replacements[$original] = $comment->getHostname();
                        break;
                    case 'mail':
                        $mail = $comment->getAuthorEmail();
                        // Add the user cacheability metadata in case the author of the comment
                        // is not the anonymous user.
                        if ($comment->getOwnerId()) {
                            $bubbleable_metadata->addCacheableDependency($comment->getOwner());
                        }
                        $replacements[$original] = $mail;
                        break;
                    case 'homepage':
                        $replacements[$original] = UrlHelper::stripDangerousProtocols($comment->getHomepage());
                        break;
                    case 'title':
                        $replacements[$original] = $comment->getSubject();
                        break;
                    case 'body':
                        // "processed" returns a \Drupal\Component\Render\MarkupInterface via
                        // check_markup().
                        $replacements[$original] = $comment->comment_body->processed;
                        break;
                    case 'langcode':
                        $replacements[$original] = $comment->language()
                            ->getId();
                        break;
                    // Comment related URLs.
                    case 'url':
                        $url_options['fragment'] = 'comment-' . $comment->id();
                        $replacements[$original] = $comment->toUrl('canonical', $url_options)
                            ->toString();
                        break;
                    case 'edit-url':
                        $url_options['fragment'] = NULL;
                        $replacements[$original] = $comment->toUrl('edit-form', $url_options)
                            ->toString();
                        break;
                    case 'author':
                        $name = $comment->getAuthorName();
                        // Add the user cacheability metadata in case the author of the comment
                        // is not the anonymous user.
                        if ($comment->getOwnerId()) {
                            $bubbleable_metadata->addCacheableDependency($comment->getOwner());
                        }
                        $replacements[$original] = $name;
                        break;
                    case 'parent':
                        if ($comment->hasParentComment()) {
                            $parent = $comment->getParentComment();
                            $bubbleable_metadata->addCacheableDependency($parent);
                            $replacements[$original] = $parent->getSubject();
                        }
                        break;
                    case 'created':
                        $date_format = DateFormat::load('medium');
                        $bubbleable_metadata->addCacheableDependency($date_format);
                        $replacements[$original] = \Drupal::service('date.formatter')->format($comment->getCreatedTime(), 'medium', '', NULL, $langcode);
                        break;
                    case 'changed':
                        $date_format = DateFormat::load('medium');
                        $bubbleable_metadata->addCacheableDependency($date_format);
                        $replacements[$original] = \Drupal::service('date.formatter')->format($comment->getChangedTime(), 'medium', '', NULL, $langcode);
                        break;
                    case 'entity':
                        $entity = $comment->getCommentedEntity();
                        $bubbleable_metadata->addCacheableDependency($entity);
                        $title = $entity->label();
                        $replacements[$original] = $title;
                        break;
                }
            }
            // Chained token relationships.
            if ($entity_tokens = $token_service->findwithPrefix($tokens, 'entity')) {
                $entity = $comment->getCommentedEntity();
                $replacements += $token_service->generate($comment->getCommentedEntityTypeId(), $entity_tokens, [
                    $comment->getCommentedEntityTypeId() => $entity,
                ], $options, $bubbleable_metadata);
            }
            if ($date_tokens = $token_service->findwithPrefix($tokens, 'created')) {
                $replacements += $token_service->generate('date', $date_tokens, [
                    'date' => $comment->getCreatedTime(),
                ], $options, $bubbleable_metadata);
            }
            if ($date_tokens = $token_service->findwithPrefix($tokens, 'changed')) {
                $replacements += $token_service->generate('date', $date_tokens, [
                    'date' => $comment->getChangedTime(),
                ], $options, $bubbleable_metadata);
            }
            if (($parent_tokens = $token_service->findwithPrefix($tokens, 'parent')) && ($parent = $comment->getParentComment())) {
                $replacements += $token_service->generate('comment', $parent_tokens, [
                    'comment' => $parent,
                ], $options, $bubbleable_metadata);
            }
            if (($author_tokens = $token_service->findwithPrefix($tokens, 'author')) && ($account = $comment->getOwner())) {
                $replacements += $token_service->generate('user', $author_tokens, [
                    'user' => $account,
                ], $options, $bubbleable_metadata);
            }
        }
        elseif (!empty($data[$type]) && $data[$type] instanceof FieldableEntityInterface) {
            
            /** @var \Drupal\Core\Entity\FieldableEntityInterface $entity */
            $entity = $data[$type];
            foreach ($tokens as $name => $original) {
                switch ($name) {
                    case 'comment-count':
                        $count = 0;
                        $fields = array_keys(\Drupal::service('comment.manager')->getFields($entity->getEntityTypeId()));
                        $definitions = array_keys($entity->getFieldDefinitions());
                        $valid_fields = array_intersect($fields, $definitions);
                        foreach ($valid_fields as $field_name) {
                            $count += $entity->get($field_name)->comment_count;
                        }
                        $replacements[$original] = $count;
                        break;
                    case 'comment-count-new':
                        $replacements[$original] = \Drupal::service('comment.manager')->getCountNewComments($entity);
                        break;
                }
            }
        }
        return $replacements;
    }

}