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/**
 * Flattens an array of arbitrarily nested arrays into a flat array.
 * E.g. [[1,2,[3]],4] -> [1,2,3,4]. 
 * @param {array} array Array to be flatten.
 */
function flatten(array) {
  /**
   * Checks if the given array has any nested array.
   * @param {array} array Array to check if it is flat.
   */

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/**
 * Cognito signOut function wrapped inside a promise.
 */
function signOut() {
  User || (User = UserPool.getCurrentUser())
  if (!User) {
    return Promise.reject('Current user session not found');
  }
  return Promise.resolve(User.signOut());
}

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/**
 * Function to handle the display of the Welcome function only for authenticated
 * users. If they are not authenticated, or an error occurs, we'll redirect them
 * to the login page.
 */
EventEmitter.on('Welcome:mount', function() {
  // Check if the user is authenticated.
  Cognito.isAuthenticated()
  .then(function() {
    // Mount the component on the DOM.

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/**
 * Function to get a valid current user session from localstorage.
 */
function getSession() {
  User || (User = UserPool.getCurrentUser());
  return new Promise(function(resolve, reject) {
    if (User === null) {
      reject('No current session found.');
      return;
    }

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/**
 * Email confirmation function that uses AWS Cognito SDK. 
 * It wraps its API into a promise to better consume it from other parts of 
 * the application.
 */
function confirm(username, code) {
  User = new CognitoUser({
    Username : username,
    Pool: UserPool,
  });

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/**
 * Signup function that uses AWS Cognito SDK. It wraps its API into a promise
 * to consume it easily from other parts of the app. 
 */
function logIn(username, password) {
  var authenticationDetails = new AuthenticationDetails({
    Username: username,
    Password: password,
  });
  User = new CognitoUser({

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/**
 * Signup function that uses AWS Cognito SDK. It wraps its API into a promise
 * to consume it easily from other parts of the app. 
 */
function signUp(email, password) {
  var attributes = [new CognitoUserAttribute({
    Name: 'email',
    Value: email,
  })]
  return new Promise(function(resolve, reject) {

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<script type="text/html" id="SignupForm">
    <div class="SignupForm">
      <div class="title">Sign Up</div>
      <form class="form">
        <div class="Control">
          <label class="Control__label" for="user">User</label>
          <input class="Control__input" name="user" type="text" placeholder="User" />
        </div>
        <div class="Control">
          <label class="Control__label" for="password">Password</label>

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(function(EventEmitter, tmpl) {

  var $root = document.getElementById('root'), 
    $container = document.createElement('div'),
    $loginLink;

  function handleLoginLink(event) {
    event.preventDefault();
    EventEmitter.emit('SignupForm:unmount')
    EventEmitter.emit('LoginForm:mount')

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(function(ready, EventEmitter) {

  ready(function() {
    EventEmitter.emit('LoginForm:mount')
  })

})(window.ready, window.EventEmitter)