// AuthHandler.js

/*
 * Helpers
 */
function signToken(id) {
  return jwt.sign({ id: id }, process.env.JWT_SECRET, {
    expiresIn: 86400 // expires in 24 hours
  });
}

function checkIfInputIsValid(eventBody) {
  if (
    !(eventBody.password &&
      eventBody.password.length >= 7)
  ) {
    return Promise.reject(new Error('Password error. Password needs to be longer than 8 characters.'));
  }

  if (
    !(eventBody.name &&
      eventBody.name.length > 5 &&
      typeof eventBody.name === 'string')
  ) return Promise.reject(new Error('Username error. Username needs to longer than 5 characters'));

  if (
    !(eventBody.email &&
      typeof eventBody.name === 'string')
  ) return Promise.reject(new Error('Email error. Email must have valid characters.'));

  return Promise.resolve();
}

function register(eventBody) {
  return checkIfInputIsValid(eventBody) // validate input
    .then(() =>
      User.findOne({ email: eventBody.email }) // check if user exists
    )
    .then(user =>
      user
        ? Promise.reject(new Error('User with that email exists.'))
        : bcrypt.hash(eventBody.password, 8) // hash the pass
    )
    .then(hash =>
      User.create({ name: eventBody.name, email: eventBody.email, password: hash })
      // create the new user
    )
    .then(user => ({ auth: true, token: signToken(user._id) }));
    // sign the token and send it back
}