import Fastify from "fastify";
import cors from "@fastify/cors";
import swagger from "@fastify/swagger";
import swaggerUI from "@fastify/swagger-ui";
import sensible from "@fastify/sensible";
import { env } from "./env.js";
import { registerRoutes } from "./routes.js";

const app = Fastify({
  logger: {
    transport: {
      target: "pino-pretty",
      options: { colorize: true, translateTime: "SYS:standard" },
    },
  },
});

await app.register(cors, { origin: true, credentials: true });

await app.register(swagger, {
  openapi: {
    info: {
      title: "LLM Multiplexer Backend",
      version: "0.1.0",
    },
  },
});

await app.register(swaggerUI, { routePrefix: "/docs" });
await app.register(sensible);

app.setErrorHandler((err, _req, reply) => {
  const e = err as any;
  const statusCode = e.statusCode ?? 500;
  reply.status(statusCode).send({
    error: true,
    message: e.message ?? String(e),
    statusCode,
  });
});

await registerRoutes(app);

await app.listen({ port: env.PORT, host: env.HOST });
app.log.info(`listening on http://${env.HOST}:${env.PORT}`);