// MakerWorld file downloader. MakerWorld is behind Cloudflare and its downloads
// are auth-gated, so we go through FlareSolverr (solves Cloudflare) carrying the
// user's `token` cookie (authenticates). The download API returns a short-lived
// signed CDN URL, which we then fetch directly.

const flaresolverr = require('../flaresolverr');

// A model page embeds its printable "instances" in __NEXT_DATA__. Each instance
// id is what the download API takes.
function parseInstances(html) {
  const m = html.match(/<script id="__NEXT_DATA__"[^>]*>([\s\S]*?)<\/script>/);
  if (!m) return [];
  let data;
  try { data = JSON.parse(m[1]); } catch { return []; }

  let result = [];
  (function walk(node) {
    if (result.length || !node || typeof node !== 'object') return;
    if (Array.isArray(node.instances) && node.instances.length && typeof node.instances[0].id === 'number') {
      result = node.instances
        .filter((x) => x && typeof x.id === 'number')
        .map((x) => ({ id: x.id, title: x.title || '' }));
      return;
    }
    for (const key of Object.keys(node)) { walk(node[key]); if (result.length) return; }
  })(data);
  return result;
}

// Resolve an instance to { name, url } (a signed, short-lived CDN download URL).
async function resolveDownload(flaresolverrUrl, instanceId, token) {
  const api = `https://makerworld.com/api/v1/design-service/instance/${instanceId}/f3mf?type=download&fileType=&devModelName=N1`;
  return flaresolverr.solveJson(flaresolverrUrl, api, {
    cookies: [{ name: 'token', value: token, domain: '.makerworld.com' }],
  });
}

// Pull the license string out of the page data (e.g. "MakerWorld Exclusive License").
function parseLicense(html) {
  const m = html.match(/"license"\s*:\s*"([^"]+)"/);
  return m ? m[1] : null;
}

module.exports = { parseInstances, resolveDownload, parseLicense };