Meteor._debug("Loading lib/drupalsso");

if (Meteor.isClient) {
  var stream = new Meteor.Stream(CHANNEL_NAME);
}

/**
 * The SSO constructor.
 *
 * Notice that the returned SSO instance has asynchronous behavior: its state
 * component will only be initialized once the server callback has returned,
 * which will almost always be some milliseconds after the instance itself is
 * returned: check sso.state.online to ensure the connection attempts is done:
 * - undefined -> not yet
 * -> false -> failed, values are defaults,
 * -> true -> succeeded,valuers are those provided by the server.
 *
 * @returns {DrupalSSO}
 * @constructor
 */
DrupalSSO = function () {
  // Called without `new`: call with it.
  if (!(this instanceof DrupalSSO)) {
    return new DrupalSSO();
  }

  // Work around "this" interpretation in local scope methods.
  var that = this;


  this.settings = {
    client: {}
  };

  this.state = {
    anonymousName: 'anome',
    cookieName: 'SESS___4___8__12__16__20__24__28__32',
    // Online is only set once the initialization has completed.
    online: undefined
  };

  var user = {
    uid: 0,
    name: 'undefined name',
    roles: ['anonymous user']
  };

  var userDep = new Tracker.Dependency();

  this.getUserId = function () {
    userDep.depend();
    return user.uid;
  };

  this.getUserName = function () {
    userDep.depend();
    return user.name;
  };

  this.getUserRoles = function () {
    userDep.depend();
    return user.roles;
  };

  /**
   * Update the user information from the Drupal server based on the cookies.
   *
   * @param {string} cookies
   */
  this.updateUser = function (cookies) {
    if (Meteor.isClient) {
      Meteor._debug('Setting up once on ' + CHANNEL_NAME);
      // Just listen once, since we rearm immediately.
      stream.once(EVENT_NAME, function (e) {
        that.updateUser(document.cookie);
      });
    }
    Meteor.call('drupal-sso.whoami', cookies, function (err, res) {
      if (err) {
        throw new Meteor.Error('whoami', err);
      }

      _.extend(user, res);
      userDep.changed();
    });
  };

  /**
   * Parse a cookie blob for value of the relevant session cookie.
   *
   * @param {string} cookieBlob
   * @returns {undefined}
   */
  this.getSessionCookie = function (cookieBlob) {
    cookieBlob = '; ' + cookieBlob;

    var cookieName = that.state.cookieName;
    var cookieValue;
    var cookies = cookieBlob.split('; ' + cookieName + "=");

    if (cookies.length == 2) {
      cookieValue = cookies.pop().split(';').shift();
    }

    return cookieValue;
  };

  /**
   * Initialize the server-only part of the SSO settings.
   *
   * This method needs to be invoked on the server-side SSO instance: it cannot
   * be invoked during construction, because the instance is not yet ready.
   *
   * @param {Object} settings
   */
  this.initServerState = function (settings) {
    that.settings['drupal-sso'] = settings['drupal-sso'];
  };

  // Constructor body:
  // - Merge public settings to instance.
  _.extend(that.settings.client, Meteor.settings.public);

  // - Initialize server-dependent state.
  Meteor.call('drupal-sso.initState', function (err, res) {
    if (err) {
      throw new Meteor.Error('init-state', err);
    }
    _.extend(that.state, res);
    if (Meteor.isClient) {
      that.updateUser(document.cookie);
    }
  });
};