export async function GET(req: Request) {
  try {
    const url = new URL(req.url);
    const parts = url.pathname.split('/');
    const id = parts[parts.length - 1] || '';
    if (!id) return new Response(JSON.stringify({ error: 'missing id' }), { status: 400, headers: { 'content-type': 'application/json' } });

    const backend = process.env.VITE_BACKEND_API_URL || process.env.VITE_TOKEN_SERVER_URL || process.env.BACKEND_URL || process.env.BACKEND || '';
    if (!backend) {
      return new Response(JSON.stringify({ error: 'BACKEND_URL not configured' }), { status: 500, headers: { 'content-type': 'application/json' } });
    }

    const resp = await fetch(`${backend.replace(/\/$/, '')}/api/session/${encodeURIComponent(id)}`);
    const text = await resp.text();
    const headers = { 'content-type': 'application/json' };
    return new Response(text, { status: resp.status, headers });
  } catch (err) {
    console.error('proxy GET /api/session/:id error', err);
    return new Response(JSON.stringify({ error: 'internal' }), { status: 500, headers: { 'content-type': 'application/json' } });
  }
}