import type {NextApiRequest, NextApiResponse} from 'next';

type ResponseData = Array<{place_name: string; center: [number, number]}>;

const {MAPBOX_TOKEN, MAPBOX_URL} = process.env;

export default async function handler(
  req: NextApiRequest,
  res: NextApiResponse<ResponseData>
) {
  const {search, proximity = 'ip', locale} = req.query;
  if (!search) return res.status(400);
  else if (!MAPBOX_TOKEN) {
    console.warn('No MAPBOX_TOKEN provided');
    return res.status(500);
  }

  const url = `${MAPBOX_URL}geocoding/v5/mapbox.places/${search}.json?proximity=${proximity}&access_token=${MAPBOX_TOKEN}&language=${locale}`;

  try {
    const mapBoxResult = await fetch(url).then(response => {
      if (response.status === 429)
        throw new Error('MAPBOX_RATE_LIMIT_EXCEEDED');
      else if (response.status === 401) throw new Error('MAPBOX_UNAUTHORIZED');
      return response.json();
    });

    if (mapBoxResult?.features) {
      res.status(200).send(mapBoxResult.features);
      return;
    } else throw new Error('MAPBOX_MALFORMED_RESPONSE');
  } catch (error) {
    console.error(error);
    res.status(500);
  }
}