// api/src/plugins/request-id.ts
import type { FastifyPluginCallback } from "fastify";
import { randomUUID } from "crypto";

const requestIdPlugin: FastifyPluginCallback = (app, _opts, done) => {
  app.addHook("onRequest", async (req, reply) => {
    const incoming = (req.headers["x-request-id"] as string | undefined)?.trim();
    const id = incoming && incoming.length > 0 ? incoming : randomUUID();
    (req as any).id = id;               // attach to request
    reply.header("x-request-id", id);    // echo on response
  });
  done();
};

export default requestIdPlugin;