(() => {
  console.log('📡 PDF auto-open helper active...');

  const sleep = ms => new Promise(res => setTimeout(res, ms));

  async function tryOpenPdf(url) {
    for (let i = 0; i < 3; i++) {
      await sleep(1500); // chờ 1.5s giữa các lần thử
      try {
        const r = await fetch(url);
        if (r.ok && r.headers.get('content-type')?.includes('pdf')) {
          console.log('✅ PDF reloaded successfully, opening popup:', url);
          window.open(url, '_blank');
          return true;
        }
      } catch (e) {
        console.warn('retry error', e);
      }
    }
    console.error('❌ still failed after retries:', url);
    return false;
  }

  const _fetch = window.fetch;
  window.fetch = async (...args) => {
    const url = typeof args[0] === 'string' ? args[0] : args[0].url;
    const res = await _fetch(...args);
    if (!res.ok && url.includes('/api/file/v1/files/upload/') && url.endsWith('.pdf')) {
      console.warn('⚠️ PDF load failed, trying popup reload:', url);
      tryOpenPdf(url);
    }
    return res;
  };

  // cũng bắt luôn XHR (axios)
  const _open = XMLHttpRequest.prototype.open;
  XMLHttpRequest.prototype.open = function (method, url, ...rest) {
    this._url = url;
    return _open.call(this, method, url, ...rest);
  };
  const _send = XMLHttpRequest.prototype.send;
  XMLHttpRequest.prototype.send = function (...args) {
    this.addEventListener('load', function () {
      if (this.status === 404 && this._url.includes('/api/file/v1/files/upload/') && this._url.endsWith('.pdf')) {
        console.warn('⚠️ PDF XHR 404, trying popup reload:', this._url);
        tryOpenPdf(this._url);
      }
    });
    return _send.apply(this, args);
  };
})();