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

module.exports = async (req, res) => {
  const { conference, partyName, partyPin, userName } = JSON.parse(req.body);
  // GET ROOM PIN
  const roomPin = await admin
    .firestore()
    .collection('rooms')
    .doc(partyName)
    .get()
    .then((roomSnap) => (roomSnap.exists ? roomSnap.data().pin : null));
  // CHECK IF ROOM EXISTS
  if (roomPin) {
    // CHECK FOR CORRECT PIN
    if (roomPin === partyPin) {
      // UPDATE CONFERENCE DETAILS
      await admin
        .firestore()
        .collection('rooms')
        .doc(partyName)
        .update({ conference })
        .catch((err) =>
          res.status(500).send({ message: 'Unable to update the call details', error: err })
        );
      // ADD SYSTEM MESSAGE
      await admin
        .firestore()
        .collection('rooms')
        .doc(partyName)
        .collection('messages')
        .add({
          uid: '<system>',
          name: '',
          text: `${userName} started the call.`,
          time: new Date(),
        })
        .catch((err) => console.error('Failed to add update conference message', err));
      res.status(200).send({ message: 'Started the conference' });
    } else {
      // WRONG ROOM PIN
      return res.status(401).send({ message: 'Wrong party pin, try rejoining' });
    }
  } else {
    // ROOM DOESN'T EXIST
    return res.status(404).send({ message: 'Party Not Found' });
  }
};