file_bulkupload_translations-1.0.x-dev/src/Plugin/Validation/Constraint/UniqueLanguageConstraintValidator.php

<?php

declare(strict_types=1);

namespace Drupal\file_bulkupload_translations\Plugin\Validation\Constraint;

use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
use Drupal\Core\Language\LanguageManagerInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\ConstraintValidator;
use Drupal\file\FileInterface;

/**
 * ConstraintValidator to avoid files with the same language when limited to 1.
 */
class UniqueLanguageConstraintValidator extends ConstraintValidator implements ContainerInjectionInterface {

  /**
   * The language manager.
   *
   * @var \Drupal\Core\Language\LanguageManagerInterface
   */
  protected $languageManager;

  /**
   * Constructs a new Multiupload Translation Handler.
   *
   * @param \Drupal\Core\Language\LanguageManagerInterface $languageManager
   *   The language manager.
   */
  public function __construct(LanguageManagerInterface $languageManager) {
    $this->languageManager = $languageManager;
  }

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) {
    return new static(
      $container->get('language_manager')
    );

  }

  /**
   * {@inheritdoc}
   */
  public function validate(mixed $value, Constraint $constraint) {
    $filename_languages = [];
    if(is_array($value)) {
      foreach ($value as $item) {
        $this->validate($item, $constraint);
      }
    }
    if ($value instanceof FileInterface) {
      // Get the language code from the filename.
      $filename_language = $this->getLangCodeByFilename($value->getFilename());
      // Check if the language of the file already exists in the array.
      if (in_array($filename_language, $filename_languages)) {
        // Add a violation if the language is already present.
        $this->context->addViolation($constraint::NOT_UNIQUE, ['%filename_language' => $filename_language]);
        return;
      }
      // Add the file's language to the array.
      $filename_languages[] = $filename_language;
    }
  }

  /**
   * Get the filename language.
   */
  private function getLangCodeByFilename(string $filename): string {
    $config = \Drupal::config('file_bulkupload_translations.settings');
    // Use regex to extract the language suffix from the filename.
    if (preg_match($config->get('regex'), str_replace(' ', '', $filename), $match)) {
      return mb_strtolower($match[1]);
    }
    // Return the default language code if no language is found.
    return $this->languageManager->getDefaultLanguage()->getId();
  }

}