<?php

namespace Drupal\comment\Plugin\Field\FieldFormatter;

use Drupal\Component\Utility\Unicode;
use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Field\Attribute\FieldFormatter;
use Drupal\Core\Field\FieldDefinitionInterface;
use Drupal\Core\Field\Plugin\Field\FieldFormatter\StringFormatter;
use Drupal\Core\StringTranslation\TranslatableMarkup;

/**
 * Plugin implementation of the 'comment_permalink' formatter.
 *
 * All the other entities use 'canonical' or 'revision' links to link the entity
 * to itself but comments use permalink URL.
 */
#[FieldFormatter(
  id: 'comment_permalink',
  label: new TranslatableMarkup('Comment Permalink'),
  field_types: [
    'string',
    'uri',
  ],
)]
class CommentPermalinkFormatter extends StringFormatter {

  /**
   * {@inheritdoc}
   */
  protected function getEntityUrl(EntityInterface $comment) {
    /** @var \Drupal\comment\CommentInterface $comment */
    $comment_permalink = $comment->permalink();
    if ($comment->hasField('comment_body') && ($body = $comment->get('comment_body')->value)) {
      $attributes = $comment_permalink->getOption('attributes') ?: [];
      $attributes += ['title' => Unicode::truncate($body, 128)];
      $comment_permalink->setOption('attributes', $attributes);
    }
    return $comment_permalink;
  }

  /**
   * {@inheritdoc}
   */
  public static function isApplicable(FieldDefinitionInterface $field_definition) {
    return parent::isApplicable($field_definition) && $field_definition->getTargetEntityTypeId() === 'comment' && $field_definition->getName() === 'subject';
  }

}