class TaxonomyTokensHooks

class TaxonomyTokensHooks {
    
    /**
     * Implements hook_token_info().
     */
    public function tokenInfo() {
        $types['term'] = [
            'name' => t("Taxonomy terms"),
            'description' => t("Tokens related to taxonomy terms."),
            'needs-data' => 'term',
        ];
        $types['vocabulary'] = [
            'name' => t("Vocabularies"),
            'description' => t("Tokens related to taxonomy vocabularies."),
            'needs-data' => 'vocabulary',
        ];
        // Taxonomy term related variables.
        $term['tid'] = [
            'name' => t("Term ID"),
            'description' => t("The unique ID of the taxonomy term."),
        ];
        $term['uuid'] = [
            'name' => t('UUID'),
            'description' => t("The UUID of the taxonomy term."),
        ];
        $term['name'] = [
            'name' => t("Name"),
            'description' => t("The name of the taxonomy term."),
        ];
        $term['description'] = [
            'name' => t("Description"),
            'description' => t("The optional description of the taxonomy term."),
        ];
        $term['node-count'] = [
            'name' => t("Node count"),
            'description' => t("The number of nodes tagged with the taxonomy term."),
        ];
        $term['url'] = [
            'name' => t("URL"),
            'description' => t("The URL of the taxonomy term."),
        ];
        // Taxonomy vocabulary related variables.
        $vocabulary['vid'] = [
            'name' => t("Vocabulary ID"),
            'description' => t("The unique ID of the taxonomy vocabulary."),
        ];
        $vocabulary['name'] = [
            'name' => t("Name"),
            'description' => t("The name of the taxonomy vocabulary."),
        ];
        $vocabulary['description'] = [
            'name' => t("Description"),
            'description' => t("The optional description of the taxonomy vocabulary."),
        ];
        $vocabulary['node-count'] = [
            'name' => t("Node count"),
            'description' => t("The number of nodes tagged with terms belonging to the taxonomy vocabulary."),
        ];
        $vocabulary['term-count'] = [
            'name' => t("Term count"),
            'description' => t("The number of terms belonging to the taxonomy vocabulary."),
        ];
        // Chained tokens for taxonomies
        $term['vocabulary'] = [
            'name' => t("Vocabulary"),
            'description' => t("The vocabulary the taxonomy term belongs to."),
            'type' => 'vocabulary',
        ];
        $term['parent'] = [
            'name' => t("Parent term"),
            'description' => t("The parent term of the taxonomy term, if one exists."),
            'type' => 'term',
        ];
        $term['changed'] = [
            'name' => t("Date changed"),
            'description' => t("The date the taxonomy was most recently updated."),
            'type' => 'date',
        ];
        return [
            'types' => $types,
            'tokens' => [
                'term' => $term,
                'vocabulary' => $vocabulary,
            ],
        ];
    }
    
    /**
     * Implements hook_tokens().
     */
    public function tokens($type, $tokens, array $data, array $options, BubbleableMetadata $bubbleable_metadata) {
        $token_service = \Drupal::token();
        if (isset($options['langcode'])) {
            $url_options['language'] = \Drupal::languageManager()->getLanguage($options['langcode']);
            $langcode = $options['langcode'];
        }
        else {
            $langcode = LanguageInterface::LANGCODE_DEFAULT;
        }
        $replacements = [];
        if ($type == 'term' && !empty($data['term'])) {
            $term = $data['term'];
            $term = \Drupal::service('entity.repository')->getTranslationFromContext($term, $options['langcode'] ?? NULL);
            foreach ($tokens as $name => $original) {
                switch ($name) {
                    case 'tid':
                        $replacements[$original] = $term->id();
                        break;
                    case 'uuid':
                        $replacements[$original] = $term->uuid();
                        break;
                    case 'name':
                        $replacements[$original] = $term->label();
                        break;
                    case 'description':
                        // "processed" returns a \Drupal\Component\Render\MarkupInterface via
                        // check_markup().
                        $replacements[$original] = $term->description->processed;
                        break;
                    case 'url':
                        $replacements[$original] = $term->toUrl('canonical', [
                            'absolute' => TRUE,
                        ])
                            ->toString();
                        break;
                    case 'node-count':
                        $query = \Drupal::database()->select('taxonomy_index');
                        $query->condition('tid', $term->id());
                        $query->addTag('term_node_count');
                        $count = $query->countQuery()
                            ->execute()
                            ->fetchField();
                        $replacements[$original] = $count;
                        break;
                    case 'vocabulary':
                        $vocabulary = Vocabulary::load($term->bundle());
                        $bubbleable_metadata->addCacheableDependency($vocabulary);
                        $replacements[$original] = $vocabulary->label();
                        break;
                    case 'parent':
                        $taxonomy_storage = \Drupal::entityTypeManager()->getStorage('taxonomy_term');
                        if ($parents = $taxonomy_storage->loadParents($term->id())) {
                            $parent = array_pop($parents);
                            $bubbleable_metadata->addCacheableDependency($parent);
                            $replacements[$original] = $parent->getName();
                        }
                        break;
                    case 'changed':
                        $date_format = DateFormat::load('medium');
                        $bubbleable_metadata->addCacheableDependency($date_format);
                        $replacements[$original] = \Drupal::service('date.formatter')->format($term->getChangedTime(), 'medium', '', NULL, $langcode);
                        break;
                }
            }
            if ($vocabulary_tokens = $token_service->findWithPrefix($tokens, 'vocabulary')) {
                $vocabulary = Vocabulary::load($term->bundle());
                $replacements += $token_service->generate('vocabulary', $vocabulary_tokens, [
                    'vocabulary' => $vocabulary,
                ], $options, $bubbleable_metadata);
            }
            if ($vocabulary_tokens = $token_service->findWithPrefix($tokens, 'parent')) {
                $taxonomy_storage = \Drupal::entityTypeManager()->getStorage('taxonomy_term');
                if ($parents = $taxonomy_storage->loadParents($term->id())) {
                    $parent = array_pop($parents);
                    $replacements += $token_service->generate('term', $vocabulary_tokens, [
                        'term' => $parent,
                    ], $options, $bubbleable_metadata);
                }
            }
            if ($changed_tokens = $token_service->findWithPrefix($tokens, 'changed')) {
                $replacements += $token_service->generate('date', $changed_tokens, [
                    'date' => $term->getChangedTime(),
                ], $options, $bubbleable_metadata);
            }
        }
        elseif ($type == 'vocabulary' && !empty($data['vocabulary'])) {
            $vocabulary = $data['vocabulary'];
            foreach ($tokens as $name => $original) {
                switch ($name) {
                    case 'vid':
                        $replacements[$original] = $vocabulary->id();
                        break;
                    case 'name':
                        $replacements[$original] = $vocabulary->label();
                        break;
                    case 'description':
                        $build = [
                            '#markup' => $vocabulary->getDescription(),
                        ];
                        // @todo Fix in https://www.drupal.org/node/2577827
                        $replacements[$original] = \Drupal::service('renderer')->renderInIsolation($build);
                        break;
                    case 'term-count':
                        $replacements[$original] = \Drupal::entityQuery('taxonomy_term')->accessCheck(TRUE)
                            ->condition('vid', $vocabulary->id())
                            ->addTag('vocabulary_term_count')
                            ->count()
                            ->execute();
                        break;
                    case 'node-count':
                        $taxonomy_storage = \Drupal::entityTypeManager()->getStorage('taxonomy_term');
                        $replacements[$original] = $taxonomy_storage->nodeCount($vocabulary->id());
                        break;
                }
            }
        }
        return $replacements;
    }

}