import express from 'express';

const router = express.Router();

// Simple proxy to Unsplash Search API.
// Requires UNSPLASH_ACCESS_KEY in environment; returns 501 if missing.
router.get('/search', async (req, res) => {
  try {
    const ACCESS_KEY = process.env.UNSPLASH_ACCESS_KEY;
    if (!ACCESS_KEY) {
      return res.status(501).json({ error: 'unsplash_disabled' });
    }
    const q = String(req.query.q || '').trim();
    const perPage = Math.min(50, Math.max(1, Number(req.query.perPage || 24)));
    if (!q) return res.json({ results: [] });

    const url = new URL('https://api.unsplash.com/search/photos');
    url.searchParams.set('query', q);
    url.searchParams.set('per_page', String(perPage));
    url.searchParams.set('client_id', ACCESS_KEY);
    // Prefer landscape/small for editor usage
    url.searchParams.set('orientation', 'landscape');

    const upstream = await fetch(url.toString(), { headers: { 'Accept-Version': 'v1' } });
    if (!upstream.ok) {
      const text = await upstream.text().catch(() => '');
      return res.status(502).json({ error: 'unsplash_upstream_error', status: upstream.status, message: text });
    }
    const json = await upstream.json();
    // Map minimal fields used by the client
    const results = Array.isArray(json?.results) ? json.results.map((r) => ({
      id: r.id,
      alt_description: r.alt_description || null,
      urls: r.urls,
      links: r.links,
      user: r.user ? { name: r.user.name } : undefined,
    })) : [];
    return res.json({ results });
  } catch (e) {
    console.error('[Unsplash] proxy error', e);
    return res.status(500).json({ error: 'internal_error' });
  }
});

export default router;