const genSalt = (key) = new Promise((resolve, reject) => bcrypt.genSalt(key, (err, salt) => {
  if (err)
    reject(err);
  resolve(salt);
}));

const hash = (pass, salt) => new Promise((resolve, reject)) => bcrypt.hash(pass, salt, (err, hash) => {
  if (err)
    reject(err);
  resolve(hash);
}));

userRouter.post('/singup', async (req, res) => {
  let errors = []
  const { managerID, fullName, password, password2 } = req.body
  if (req.body.password != req.body.password2) {
    errors.push({ text: 'Passwords do not match' })
  }

  if (errors.length > 0) {
    res.render('user/signup', {
      errors,
      managerID,
      fullName,
      password
    });
    return;
  }
  const user = await User.findOne({ managerID })
  if (user) {
    req.flash('error_msg', 'ID is already registered!')
    res.redirect('/user/signup')
    return;
  }

  const newUser = new User({
    managerID,
    fullName,
    password
  })

  const salt = await genSalt(10);
  const hash = await hash(newUser.password, salt);

  newUser.password = hash
  await newUser.save()

  try {
    req.flash('success_msg', 'You are now registered and can log in');
    res.redirect('/user/login')
  } catch (err) {
    console.log(err)
    return
  }

})