import fp from 'fastify-plugin';
import { nanoid } from 'nanoid';
import { env } from '../config/env.js';

export const GUEST_COOKIE = 'fw_gid';
const GUEST_COOKIE_MAX_AGE = 60 * 60 * 24 * 365 * 2; // 2 years

export default fp(async (app) => {
  app.addHook('onRequest', async (request, reply) => {
    const existing = request.cookies[GUEST_COOKIE];
    if (existing && existing.length >= 16 && existing.length <= 64) {
      request.guestId = existing;
      return;
    }
    const id = nanoid(24);
    request.guestId = id;
    reply.setCookie(GUEST_COOKIE, id, {
      httpOnly: true,
      secure: env.NODE_ENV === 'production',
      sameSite: 'lax',
      path: '/',
      maxAge: GUEST_COOKIE_MAX_AGE,
    });
  });
});