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

export class LocalStorageLanguageRepository implements LanguageRepository {
  load(): Language | null {
    if (typeof window === 'undefined') return null;

    const saved = localStorage.getItem(STORAGE_KEYS.language);
    if (saved && isLanguage(saved)) return saved;
    return null;
  }

  save(language: Language): void {
    if (typeof window === 'undefined') return;
    localStorage.setItem(STORAGE_KEYS.language, language);
  }
}