import {
  DEFAULT_LANGUAGE,
  isLanguage,
  type Language,
} from '@/domain/language/entities';
import type { LanguageRepository } from '@/domain/language/repository';

/** New visitors see Swedish unless they have saved a language preference. */
export function resolveInitialLanguage(repository: LanguageRepository): Language {
  const saved = repository.load();
  if (saved && isLanguage(saved)) return saved;
  return DEFAULT_LANGUAGE;
}

export function persistLanguage(repository: LanguageRepository, language: Language): void {
  repository.save(language);
}