import storageAvailable from './storageAvailable';

// If the user's browser doesn't support localStorage, we can use this variable
// as a fallback to store their authentication token. This will allow them to use
// the application, but if they refresh the browser (or navigate away from the
// application), this variable will be reset, and they'll be logged out of the
// application since we've lost the token that provided their identity.
let tokenFallback = null;

export default {

  saveToken(token) {
    if (storageAvailable('localStorage')) {
      localStorage.setItem('userToken', token);
    } else {
      tokenFallback = token;
      let message = `
      Your web browser does not allow access to local storage. In Safari, the most common cause of
      this is using "Private Browsing Mode". This will not affect the functionality of this application,
      but you will be logged out if you leave the site or refresh the page.
      `;
      message = message.split('\n').join(' ').trim();
      alert(message);
    }
  },

  hasToken() {
    if (storageAvailable('localStorage')) {
      return !!localStorage.getItem('userToken');
    }

    return !!tokenFallback;
  },

  getToken() {
    if (storageAvailable('localStorage')) {
      return localStorage.getItem('userToken');
    }

    return tokenFallback;
  },

  deleteToken() {
    if (storageAvailable('localStorage')) {
      localStorage.removeItem('userToken');
    } else {
      tokenFallback = null;
    }
  }

};