import type { NextApiRequest, NextApiResponse } from 'next';
import { createRideBusClient, parseRequest, RideBusError } from '@/lib/ridebus';

const ridebus = createRideBusClient();

export default async function departures(
  req: NextApiRequest,
  res: NextApiResponse
) {
  res.setHeader('Cache-Control', 'no-store');
  if (req.method !== 'GET') {
    res.setHeader('Allow', 'GET');
    return res.status(405).json({ error: 'method_not_allowed' });
  }
  try {
    return res.status(200).json(await ridebus.get(parseRequest(req.query)));
  } catch (error) {
    const status = error instanceof RideBusError ? error.status : 502;
    // Never forward upstream responses or configuration details to the browser.
    return res.status(status).json({ error: 'departures_unavailable' });
  }
}