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

module.exports = async (req, res) => {
  console.log('Requested Leave - UID - ', req.params.uid, '\n\tRoom - ', req.params.rid);
  const userName = await admin
    .firestore()
    .collection('rooms')
    .doc(req.params.rid)
    .collection('users')
    .doc(req.params.uid)
    .get()
    .then((userSnap) => userSnap.data().name);
  await admin
    .firestore()
    .collection('rooms')
    .doc(req.params.rid)
    .collection('users')
    .doc(req.params.uid)
    .delete()
    .catch((err) =>
      console.error(
        `Failed to remove user from party : \n\t Room: ${req.params.rid} \n\t User: ${req.params.uid}`,
        err
      )
    );
  admin
    .firestore()
    .collection('rooms')
    .doc(req.params.rid)
    .collection('messages')
    .add({
      uid: '<system>',
      time: new Date(),
      name: '',
      text: `${userName} left the party.`,
    });
  res.status(200).send({ message: 'Left the party' });
};