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const registeredName = (displayName) => {
  if (!displayName || displayName.length < 8) {
    return '"displayName" length must be at least 8 characters long';
  }
  return null;
};

const registeredEmail = (email) => {
  if (!email || !/^\S+@\S+\.\S+$/.test(email)) {
    return '"email" must be a valid email';
  }
  return null;
};

const registeredPassword = (password) => {
  if (!password || password.length < 6) {
    return '"password" length must be at least 6 characters long';
  }
  return null;
};

const registeredInfo = (userInfo) => {
  const nameError = registeredName(userInfo.displayName);
  if (nameError) {
    return nameError;
  }

  const emailError = registeredEmail(userInfo.email);
  if (emailError) {
    return emailError;
  }

  const passwordError = registeredPassword(userInfo.password);
  if (passwordError) {
    return passwordError;
  }

  return null;
};

module.exports = {
  registeredInfo,
};