// Proxy de servicio de nombres (caché + normalización)
export class NamesServiceProxy {
  constructor(fetchNamesForDocs){
    this._fetch = typeof fetchNamesForDocs === 'function' ? fetchNamesForDocs : async () => ({});
    this._cache = new Map();
  }
  async get(docs){
    const ask = [];
    for (const d of docs) if (!this._cache.has(d)) ask.push(d);
    if (ask.length){
      const map = await this._fetch(ask);
      for (const [k,v] of Object.entries(map || {})) this._cache.set(String(k), v || {});
    }
    const out = {};
    for (const d of docs) out[d] = this._cache.get(d) || {};
    return out;
  }
}