oliverdavies.uk/web/modules/custom/opdavies_blog/src/Entity/Node/Post.php

<?php

declare(strict_types=1);

namespace Drupal\opdavies_blog\Entity\Node;

use Drupal\discoverable_entity_bundle_classes\ContentEntityBundleInterface;
use Drupal\node\Entity\Node;
use Drupal\taxonomy\Entity\Term;
use Illuminate\Support\Collection;

/**
 * Defines an blog post node class.
 *
 * @ContentEntityBundleClass(
 *   label = @Translation("Blog post"),
 *   entity_type = "node",
 *   bundle = "post"
 * );
 */
class Post extends Node implements ContentEntityBundleInterface {

  public function getExternalLink(): ?array {
    return ($link = $this->get('field_external_link')->get(0))
      ? $link->getValue()
      : NULL;
  }

  /**
   * @return Collection|Term[]
   */
  public function getTags(): Collection {
    return new Collection($this->get('field_tags')->referencedEntities());
  }

  public function hasBeenSentToSocialMedia(): bool {
    return (bool) $this->get('field_sent_to_social_media')->getString();
  }

  public function hasTweet(): bool {
    return (bool) $this->get('field_has_tweet')->getString();
  }

  public function isExternalPost(): bool {
    return (bool) $this->getExternalLink();
  }

  public function setTags(array $tags): void {
    $this->set('field_tags', $tags);
  }

  public function toTweet(): string {
    $parts = [
      $this->label(),
      $this->url('canonical', ['absolute' => TRUE]),
      $this->convertTermsToHashtags(),
    ];

    return implode(PHP_EOL . PHP_EOL, $parts);
  }

  private function convertTermsToHashtags(): string {
    return $this->getTags()
      ->map(fn(Term $term) => $this->convertTermToHashtag($term))
      ->implode(' ');
  }

  private function convertTermToHashtag(Term $tag): string {
    $tagName = strtolower($tag->label());
    $tagName = "#{$tagName}";
    $tagName = str_replace(' ', '-', $tagName);

    return $tagName;
  }

}