import { NextRequest } from "next/server";
import { CLOUD_BASE, FRONTEND_API_KEY } from "@/lib/cloud";

// Proxy the editor's AI chat requests to Frontend Cloud, injecting the API key
// server-side so it is never exposed to the client. The cloud response is
// streamed straight back to the caller.
export async function POST(req: NextRequest) {
  const upstream = await fetch(`${CLOUD_BASE}/api/chat`, {
    method: "POST",
    headers: {
      "content-type": req.headers.get("content-type") ?? "application/json",
      "x-api-key": FRONTEND_API_KEY,
    },
    body: req.body,
    // Required by undici when forwarding a streaming request body.
    // @ts-expect-error - duplex is valid but missing from the lib types.
    duplex: "half",
  });

  return new Response(upstream.body, {
    status: upstream.status,
    headers: {
      "content-type":
        upstream.headers.get("content-type") ?? "application/octet-stream",
    },
  });
}