// Copyright 2013 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

var service, tracker, out;

function initAnalyticsConfig(config) {
  document.getElementById('settings-loading').hidden = true;
  document.getElementById('settings-loaded').hidden = false;

  var checkbox = document.getElementById('analytics');
  checkbox.checked = config.isTrackingPermitted();
  checkbox.onchange = function() {
    config.setTrackingPermitted(checkbox.checked);
  };
}

function startApp() {
  // Initialize the Analytics service object with the name of your app.
  service = analytics.getService('ice_cream_app');
  service.getConfig().addCallback(initAnalyticsConfig);

  // Get a Tracker using your Google Analytics app Tracking ID.
  tracker = service.getTracker('UA-XXXXX-X');

  // Record an "appView" each time the user launches your app or goes to a new
  // screen within the app.
  tracker.sendAppView('MainView');

  var button1 = document.getElementById('chocolate');
  var button2 = document.getElementById('vanilla');
  out = document.getElementById('out');
  [button1, button2].forEach(addButtonListener);
}

function addButtonListener(button) {
  button.addEventListener('click', function() {
    tracker.sendEvent('Flavor', 'Choose', button.id);
    out.textContent = 'You chose: ' + button.textContent;
  });
}

window.onload = startApp;