const BACKEND_BASE = process.env.BACKEND_INTERNAL_URL || process.env.NEXT_PUBLIC_BACKEND_URL;

export async function GET(
  _req: Request,
  context: any
) {
  if (!BACKEND_BASE) {
    return new Response('BACKEND_INTERNAL_URL/NEXT_PUBLIC_BACKEND_URL 未配置', { status: 500 });
  }
  const raw = context?.params;
  const params = raw && typeof raw.then === 'function' ? await raw : raw;
  const provider_id = params?.provider_id as string | undefined;
  if (!provider_id) {
    return new Response('provider_id 缺失', { status: 400 });
  }
  const target = `${BACKEND_BASE}/discover-models/${encodeURIComponent(provider_id)}`;
  const resp = await fetch(target, {
    headers: { 'Content-Type': 'application/json' },
    cache: 'no-store',
  });
  const text = await resp.text();
  return new Response(text, {
    status: resp.status,
    headers: { 'Content-Type': resp.headers.get('Content-Type') || 'application/json' },
  });
}