const admin = require('firebase-admin');

module.exports = (req, res, next) => {
  res.set('Access-Control-Allow-Origin', ['*']);
  if (req.method === 'OPTIONS') {
    res.status(200).send();
    return next();
  }
  if (req.headers.authorization) {
    try {
      const token = req.headers.authorization.split(' ')[1];
      const reqToken = token.split(':')[0];
      const reqUid = token.split(':')[1];
      admin
        .auth()
        .verifyIdToken(reqToken)
        .then((user) => {
          if (user.uid === reqUid) {
            console.info('Verified Token - UID - ', reqUid);
            if (req.method === 'POST') {
              const bodydata = JSON.parse(req.body);
              bodydata.uid = user.uid;
              req.body = JSON.stringify(bodydata);
            }
            if (req.method === 'GET' || req.method === 'DELETE' || req.method === 'PUT') {
              req.body = JSON.stringify({ uid: user.uid });
            }
            return next();
          } else {
            return res.status(401).send({ message: 'Unauthorized' });
          }
        })
        .catch((err) => {
          console.error('Failed Auth - ', req.headers.authorization, '\n', err);
          return res.status(500).send({ message: 'Unable to verify user token' });
        });
    } catch (err) {
      console.log(err);
      return res.status(401).send({ message: 'Something went wrong when authorizing' });
    }
  } else return res.status(401).send({ message: 'Got no user token' });
};