function logIn(apiKey, userId) {
  localStorage.apiKey = apiKey;
  localStorage.userId = userId;
  setState(States.IDLE);
}

function logOut() {
  delete localStorage.apiKey;
  delete localStorage.userId;
  setState(States.PUBLIC);
}

function isLoggedIn() {
  return !!localStorage.apiKey && !!localStorage.userId;
}

function getApiKey() {
  return localStorage.apiKey;
}

function getUserId() {
  return localStorage.userId;
}

function handleAuthBtn() {
  if (isLoggedIn()) {
    logOut();
  } else {
    var apiKey = u("#api-key").first().value;
    if (apiKey === undefined || apiKey === "") {
      return;
    }

    var userId = u("#user-id").first().value;
    if (userId === undefined || userId === "") {
      return;
    }

    logIn(apiKey, userId);
  }
  u("#api-key").first().value = "";
  updateAuthBtnText();
}

function updateAuthBtnText() {
  var btn = u("#auth-btn");

  if (isLoggedIn()) {
    btn.text("Log Out");
  } else {
    btn.text("Log In");
  }
}