(async () => {
  const BASE = 'https://qa6.ru';
  const PER_PAGE = 500;          // меньше запросов к API
  const PAGE_CONCURRENCY = 8;    // параллельные страницы
  const IMG_CONCURRENCY = 16;    // параллельные фото
  const ZIP_NAME = 'qa6-models.zip';

  const loadScript = (src) =>
    new Promise((res, rej) => {
      const s = document.createElement('script');
      s.src = src;
      s.onload = res;
      s.onerror = rej;
      document.head.appendChild(s);
    });

  if (!window.JSZip) {
    await loadScript('https://cdn.jsdelivr.net/npm/jszip@3.10.2/dist/jszip.min.js');
  }

  const pool = async (items, limit, fn) => {
    const out = new Array(items.length);
    let i = 0;
    const workers = Array.from({ length: Math.min(limit, items.length) }, async () => {
      while (i < items.length) {
        const idx = i++;
        out[idx] = await fn(items[idx], idx);
      }
    });
    await Promise.all(workers);
    return out;
  };

  const firstUrl =
    `${BASE}/api/new-car-kit/admin/1/all-models` +
    `?per_page=${PER_PAGE}&page=1&sort_by=id_car_model&sort_dir=asc`;

  const first = await fetch(firstUrl).then((r) => r.json());
  const lastPage = first.last_page || 1;
  console.log(`моделей: ${first.total}, страниц: ${lastPage}`);

  const pages = [first.data || []];
  const rest = Array.from({ length: lastPage - 1 }, (_, i) => i + 2);

  const restData = await pool(rest, PAGE_CONCURRENCY, async (page) => {
    const url =
      `${BASE}/api/new-car-kit/admin/1/all-models` +
      `?per_page=${PER_PAGE}&page=${page}&sort_by=id_car_model&sort_dir=asc`;
    const json = await fetch(url).then((r) => r.json());
    console.log(`API page ${page}/${lastPage}`);
    return json.data || [];
  });
  pages.push(...restData);

  const models = pages.flat().filter((m) => m.image_path && String(m.image_path).trim());
  console.log(`с фото: ${models.length}`);

  const zip = new JSZip();
  const folder = zip.folder('models');
  let ok = 0;
  let fail = 0;

  await pool(models, IMG_CONCURRENCY, async (m, idx) => {
    const path = String(m.image_path).replace(/^\/+/, '');
    const url = `${BASE}/storage/${path}`;
    const ext = path.match(/\.[a-z0-9]+$/i)?.[0] || '.png';
    const name =
      `${String(m.mark_name || 'mark')}_${String(m.model_name || 'model')}_${m.car_id || idx}`
        .replace(/[\\/:*?"<>|]+/g, '_')
        .replace(/\s+/g, '_') + ext;

    try {
      const res = await fetch(url);
      if (!res.ok) throw new Error(res.status);
      const buf = await res.arrayBuffer();
      folder.file(name, buf);
      ok++;
    } catch (e) {
      fail++;
      console.warn('fail', url, e);
    }

    if ((ok + fail) % 50 === 0) {
      console.log(`фото ${ok + fail}/${models.length} (ok ${ok}, fail ${fail})`);
    }
  });

  console.log(`качаю zip: ok ${ok}, fail ${fail}`);
  const blob = await zip.generateAsync({ type: 'blob', compression: 'STORE' });
  const a = document.createElement('a');
  a.href = URL.createObjectURL(blob);
  a.download = ZIP_NAME;
  a.click();
  URL.revokeObjectURL(a.href);
  console.log('готово');
})();