<?php

namespace Drupal\bundle_article\Controller;
use Drupal\Core\Controller\ControllerBase;
use Symfony\Component\HttpFoundation\JsonResponse;
use Symfony\Component\HttpFoundation\Request;

class CategoryController extends ControllerBase {

  private const VOCABULARY = 'AAAAA_category'; // Editable

  private const HTTP_BAD_REQUEST = 400;
  private const HTTP_OK = 200;
  private array $response = [];
  private int $statusCode = self::HTTP_OK;

  // MAIN

  public function getCategories(Request $request, $lang) {
    $this->response = [
      'code' => $this->statusCode,
      'lang' => $lang,
      'categories' => $this->buildVocabulary($lang)];

    return new JsonResponse($this->response, $this->statusCode);
  }

  // RESPONSE ARRAY

  private function buildVocabulary($lang): array {
    $terms = $this->loadTerms($lang);
    $terms_response = [];
    foreach ($terms as $type) {
      $terms_response[] = [
        'id' => $type->id(),
        'name' => $type->getName()
      ];
    }
    return $terms_response;
  }

  // RESPONSE ARRAY VALUES

  private function loadTerms($lang) {

    // All terms from the vocabulary
    $terms=\Drupal::entityTypeManager()
      ->getStorage('taxonomy_term')
      ->loadByProperties([
        'vid' => self::VOCABULARY,
      ]);

    // Current language only
		$termList=[];
		foreach($terms as $term) {
			if($term->hasTranslation($lang)){
				$tid = $term->id();
				$translated_term = \Drupal::service('entity.repository')->getTranslationFromContext($term, $lang);
				$termList[$tid] = $translated_term;
			}
		}
		return $termList;
  }

}