03 Route Handler

import type { FastifyInstance } from "fastify";
import { z } from "zod";
import { supportAgent } from "../ai/support-agent";

const SupportRequest = z.object({
  message: z.string().trim().min(1, "message is required"),
});

export async function supportRoutes(app: FastifyInstance) {
  app.post("/support", async (request, reply) => {
    const parsed = SupportRequest.safeParse(request.body);

    if (!parsed.success) {
      return reply.status(400).send({
        error: { code: "bad_request", message: parsed.error.issues[0]?.message },
      });
    }

    const response = await supportAgent.prompt(parsed.data.message).send();

    return reply.send({
      output: response.output,
      usage: response.usage,
      messages: response.messages,
    });
  });
}

import Fastify from "fastify";
import { supportRoutes } from "./routes/support";

export const app = Fastify({ logger: true });

await app.register(supportRoutes, { prefix: "/api" });

const response = await fetch("http://localhost:3000/api/support", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({ message: "How long does a reset link last?" }),
});

const data = await response.json();
console.log(data.output);