// Thingiverse importer — uses the official REST API (https://www.thingiverse.com/developers).
// Needs a free app token in THINGIVERSE_TOKEN.

const API = 'https://api.thingiverse.com';

// Accepts .../thing:12345, .../thing:12345/files, or a bare id. Returns id or null.
function parse(url) {
  if (/^\d+$/.test(url.trim())) return url.trim();
  const m = String(url).match(/thing:(\d+)/i);
  return m ? m[1] : null;
}

async function api(pathname, token) {
  const res = await fetch(`${API}${pathname}`, {
    headers: { Authorization: `Bearer ${token}` },
  });
  if (!res.ok) {
    throw new Error(`Thingiverse API ${res.status} for ${pathname}`);
  }
  return res.json();
}

// Returns a normalized model description + the list of files to download.
async function fetchModel(thingId, token) {
  const [thing, files, tags] = await Promise.all([
    api(`/things/${thingId}`, token),
    api(`/things/${thingId}/files`, token),
    api(`/things/${thingId}/tags`, token).catch(() => []),
  ]);

  const creator = thing.creator || {};
  return {
    source_site: 'thingiverse',
    source_id: String(thingId),
    source_url: thing.public_url || `https://www.thingiverse.com/thing:${thingId}`,
    name: thing.name || `Thing ${thingId}`,
    description: stripHtml(thing.description || ''),
    license: thing.license || null,
    designer: creator.name
      ? { name: creator.name, source_site: 'thingiverse', profile_url: creator.public_url }
      : null,
    tags: (tags || []).map((t) => t.name).filter(Boolean),
    downloads: (files || []).map((f) => ({
      name: f.name,
      // download_url is an API endpoint that 302s to the real file; needs the token.
      url: `${f.download_url}?access_token=${encodeURIComponent(token)}`,
    })),
  };
}

function stripHtml(html) {
  return String(html).replace(/<[^>]*>/g, '').replace(/\s+\n/g, '\n').trim();
}

module.exports = { parse, fetchModel };