export async function midi(req) {
  const { searchParams: sp } = new URL(req.url);
  const q = sp.get('q');
  const page = sp.get('page') || 0;
  const id = sp.get('id');
  const mode = sp.get('mode') || 'search';

  if (mode === 'download' && id) {
    return Response.redirect(`https://bitmidi.com/uploads/${id}.mid`, 302);
  }

  if (!q) {
    return {
      error: "missing query",
      usage: {
        search: "/midi?q=tokyo",
        page: "/midi?q=tokyo&page=1",
        download: "/midi?mode=download&id=104639"
      }
    };
  }

  try {
    const res = await fetch(`https://bitmidi.com/api/midi/search?q=${encodeURIComponent(q)}&page=${page}`, {
      headers: { "Accept": "application/json" }
    });
    const data = await res.json();

    const results = (data.result?.results || []).map(r => ({
      id: r.id,
      name: r.name,
      slug: r.slug,
      views: r.views,
      plays: r.plays,
      url: `https://bitmidi.com${r.url}`,
      download: `https://bitmidi.com${r.downloadUrl}`
    }));

    return {
      status: true,
      query: q,
      page: Number(page),
      total: data.result?.total || 0,
      results
    };
  } catch (err) {
    return { error: err.message };
  }
}