// Bridge from the Vercel edge (Next route handlers) to the FastAPI data engine
// (services/api) running on the VPS. When ENGINE_URL is set, the edge defers to
// the engine as the single source of truth; otherwise it computes locally.
export function hasEngine(): boolean {
  return Boolean(process.env.ENGINE_URL);
}

export async function engineFetch(path: string, init?: RequestInit): Promise<Response | null> {
  const base = process.env.ENGINE_URL;
  if (!base) return null;
  try {
    return await fetch(`${base}${path}`, {
      ...init,
      headers: {
        "Content-Type": "application/json",
        "X-Internal-Token": process.env.INTERNAL_TOKEN ?? "",
        ...(init?.headers ?? {}),
      },
      cache: "no-store",
    });
  } catch {
    return null;
  }
}