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// Copyright 2009 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.
 */
/**
 * @fileoverview a sample showing how to get GA Data into a Motion Chart.
 * This sample first requests the top X sources, then gets monthly data
 * over a year for each of these sources. This example shows how to handle
 * multiple asynchronous API requests using a counter and continue execution
 * once all the data has returned.
 */

var requestCount;
var totalSources;
var myService;
var mainChartData = {};
var motionChart;
var scope = 'https://www.google.com/analytics/feeds';

/**
 * Initialize all the objects from the Google AJAX Apis once they
 * have been loaded and are ready to use.
 */
function init() {
  myService =
      new google.gdata.analytics.AnalyticsService('gaExportAPI_motionChart_v1.0');

  getStatus();
}
/**
 * Utility function to setup the login/logout functionality.
 */
function getStatus() {
  var status = document.getElementById('status');
  var buttonLogin = document.getElementById('buttonLogin');
  var inputP = document.getElementById('inputP');
  buttonLogin.style.visibility = 'visible';

  if (!google.accounts.user.checkLogin(scope)) {
    buttonLogin.value = 'Login';
    buttonLogin.onclick = login;
    status.innerHTML = 'You are logged out, login to continue';
    inputP.style.visibility = 'hidden';
  } else {
    buttonLogin.value = 'Logout';
    buttonLogin.onclick = logout;
    status.innerHTML = 'You are logged in';
    inputP.style.visibility = 'visible';
  }
}

/**
 * AuthSub Authentication to allow users to grant this script
 * access to their GA data.
 */
function login() {
  google.accounts.user.login(scope);
  getStatus();
}

/**
 * AuthSub Authentication to allow users to remove this script
 * access to their GA data.
 */
function logout() {
  google.accounts.user.logout();
  getStatus();
}

/**
 * Request data from GA Export API.
 */
function getDataFeed() {
  showLoadingMessage();

  var myFeedUri = scope + '/data' +
    '?start-date=2008-01-01' +
    '&end-date=2008-12-31' +
    '&dimensions=ga:source' +
    '&metrics=ga:visits' +
    '&sort=-ga:visits' +
    '&max-results=7' +
    '&ids=ga:' + document.getElementById('inputProfileId').value;

  myService.getDataFeed(myFeedUri, handleMyDataFeed, handleError);
}

/**
 * Callback method to handle and display any error that occurs from
 * the API request.
 * @param {Object} e The error object returned by the Analytics API.
 */
function handleError(e) {
  var msg = e.cause ? e.cause.statusText : e.message;
  msg = 'ERROR: ' + msg;
  alert(msg);
}

/**
 * Callback metod to handle all the data returned by GA Export API
 * @param {Object} myResultsFeedRoot the feed object
 *     retuned by the data feed.
 */
function handleMyDataFeed(myResultsFeedRoot) {
  collectData(myResultsFeedRoot);
}

/**
 * Get data for each source in the passed in feed.
 * @param {Object} myResultsFeedRoot the Object returned by the GA Data Feed.
 */
function collectData(myResultsFeedRoot) {
  var entries = myResultsFeedRoot.feed.getEntries();
  if (entries.length == 0) {
    return;
  }

  // set a counter to the number of requests we'll be sending
  requestCount = entries.length;
  totalSources = entries.length;

  for (var idx = 0; idx < entries.length; idx++) {
     var source = entries[idx].getValueOf('ga:source');
     getMonthlySourceFeed(source);
  }
}

/**
 * Make a GA Data Feed request for monthly data for a particular source.
 * @param {String} source the source to get monthly data for.
 */
function getMonthlySourceFeed(source) {
  var myFeedUri = scope + '/data' +
    '?start-date=2008-01-01' +
    '&end-date=2008-12-31' +
    '&dimensions=ga:month' +
    '&metrics=ga:visits,ga:bounces,ga:pageviews,ga:visitDuration' +
    '&sort=ga:month' +
    '&filters=ga:source%3D%3D' + source +
    '&ids=ga:' + document.getElementById('inputProfileId').value;

    myService.getDataFeed(myFeedUri, handleSourceData, handleError);
}

/**
 * Store the GA API request into an object and decrement the number of
 * @param {Object} sourceResults the Object passed back from the GA export API.
 */
function handleSourceData(sourceResults) {
  // get source parameter from Feed ID
  var source = sourceResults.feed.getId().getValue();
  var sourceArray = source.split('%3D%3D');
  sourceArray = sourceArray[1].split('&');
  source = sourceArray[0];

  mainChartData[source] = sourceResults.feed.getEntries();

  // since GA feed requests will return asynchronously, decrement the number
  // of requests that were sent.
  requestCount--;

  // if there are no more expected requests process the data into a dataTable
  if (requestCount == 0) {
    getDataTable();
  }
}

/**
 * Create a Google Visualization Data Table once all the data has been
 * collected from the GA Export API. Then visualize the Motion Chart.
 * Note: although we only add monthly data to our chart, the motion chart
 * will interpolate data between the months to display daily data.
 */
function getDataTable() {
  var dataTable = new google.visualization.DataTable();

  var rowCount = 0;
  var entries;
  var entry;

  dataTable.addColumn('string', 'Source');
  dataTable.addColumn('date', 'Date');
  dataTable.addColumn('number', 'Visits');
  dataTable.addColumn('number', 'Bounces');
  dataTable.addColumn('number', 'Pageviews');
  dataTable.addColumn('number', 'Time On Site');

  dataTable.addRows(totalSources * 12);

  for (source in mainChartData) {
    entries = mainChartData[source];
    for (var idx = 0; idx < entries.length; idx++) {
      entry = entries[idx];
      dataTable.setCell(rowCount, 0, source);
      dataTable.setCell(rowCount, 1, new Date(2008, idx, 1));
      dataTable.setCell(rowCount, 2, entry.getValueOf('ga:visits'));
      dataTable.setCell(rowCount, 3, entry.getValueOf('ga:bounces'));
      dataTable.setCell(rowCount, 4, entry.getValueOf('ga:pageviews'));
      dataTable.setCell(rowCount, 5, entry.getValueOf('ga:visitDuration'));
      rowCount++;
    }
  }
  hideLoadingMessage();

  if (motionChart) {
    delete motionChart;
  }
  motionChart =
      new google.visualization.MotionChart(document.getElementById('motionChartDiv'));
  motionChart.draw(dataTable,
      {width: 800, height: 450, showSelectListComponent: 'true', showSidePanel: 'true'});
  delete mainChartData;
  mainChartData = {};
}

/**
 * Shows the loading message so people know to wait for the script.
 */
function showLoadingMessage() {
  var chartDiv = document.getElementById('motionChartDiv');
  var myDivString = '<div class="loading">' +
      '<p>Loading Data Please Wait...</p>' +
      '<img src="ajax-loader.gif"/></div>';
  chartDiv.innerHTML = myDivString;
}

/**
 * Hides the loading message once the motion chart is ready to present.
 */
function hideLoadingMessage() {
  var chartDiv = document.getElementById('motionChartDiv');
  chartDiv.innerHTML = '';
}

// Load the Google Visualization API client Libraries
google.load('visualization', '1', {packages: ['motionChart']});

// Load the Google data JavaScript client library
google.load('gdata', '1.x');

google.setOnLoadCallback(init);