// PREPARE FOR CONFIGURATION
  var updateInterval, scriptElementId, analyticsFolder;
  var loadTime, autoRefreshTime, selectedType, paginationEnabled, paginationCount;
  var googleStaticMapsAPIkey;

  // SETTINGS FOR CLIENT'S BROWSER
  updateInterval = 5; //the interval to update a visitor's log (in seconds)
  scriptElementId = 'analytics'; //the id attribute of the script element used to call the analytix.js file
  analyticsFolder = 'analytics/'; //path to the folder containing analytix.php

  // SETTINGS FOR CONTROL PANEL
  loadTime = 0; //the speed at which counters are incremented (the smaller, the faster) (0 bypasses ticker animation completely)
  autoRefreshTime = 1000; //the speed at which data auto-refreshes (in milleseconds)
  selectedType = 0; //the selected timeframe (whatever is initialized here is the default value)
  paginationEnabled = 0; //whether or not to paginate visitors in the control panel
  paginationCount = 25; //how many visitors to display per page if using pagination

  // SETTINGS FOR EXTERNAL APIs
  var googleStaticMapsAPIkey = ''; //optional; the API key, if you need to include one, that you have obtained for the Google Static Maps API that is used by this analytics system

  // CREATE GOOGLE STATIC MAPS API KEY STRING
  // if an API key was provided above, create a string to append to all Google
  // Static Maps API requests
  var googleStaticMapsAPIkeyString = ''
  if (googleStaticMapsAPIkey != '' && googleStaticMapsAPIkey.length >= 0) {
    googleStaticMapsAPIkeyString = '&key=' + googleStaticMapsAPIkey;
  }

  // OPEN POPUP
  // opens a popup window (new window, not new tab) with a width of 640 and
  // a height of 480 to the specified url
  //
  // url: the location to load in the popup
  function openPopup(url) {
    var newWindow = window.open(url, '_blank', 'width=640, height=480, location=no, menubar=no, resizable=yes, scrollbars=yes, status=no, toolbar=no');

    return newWindow;
  }

  // GET QUERY
  // returns the value of the requested 'variable' from the URL's query
  // string, or returns false if the variable is not found
  function get(variable) {
    var query, vars;

    query = window.location.search.slice(1);
    vars = query.split('&');

    for (var i = 0; i < vars.length; i++) {
      var pair = vars[i].split('=');
      if (pair[0] == variable) {
        return decodeURIComponent(pair[1]);
      }
    }

    return false;
  }

  // AJAX CALL
  // asynchronously connects to a server and requests a file, then processes
  // the responses with the given function
  //
  // url: file to call
  // data: post or get data
  // method: either post or get
  // respond: function to call and pass xmlhttp.responseText as argument to
  function ajaxCall(url, data, method, respond) {
    var xmlhttp;
    data = data || '';
    method = method || 'GET';

    // console.log('inside AJAXCall Data:==>', data); // ERE20210901
    if (window.XMLHttpRequest) { //IE7+, Firefox, Chrome, Opera, Safari
      xmlhttp = new XMLHttpRequest();
    }
    else {//IE6, IE5
      xmlhttp = new ActiveXObject('Microsoft.XMLHTTP');
    }

    xmlhttp.onreadystatechange = function() {
      if (xmlhttp.readyState == 4 && xmlhttp.status == 200 && !(!respond)) {
        respond(xmlhttp.responseText);
      }
    }
    xmlhttp.open(method, url, true);
    xmlhttp.setRequestHeader('Content-type','application/x-www-form-urlencoded');
    xmlhttp.send(data);
  }

  // PARSE SECONDS
  // takes seconds and returns a time string in the format of HH:MM:SS
  function parseSeconds(seconds) {
    var min, sec, hr;

    min = Math.floor(seconds / 60);
    sec = (seconds - (min * 60));
    hr = Math.floor(min / 60);
    min = (min - (hr * 60));

    return padNumber(hr, 2) + ':' + padNumber(min, 2) + ':' + padNumber(sec, 2);
  }

  // PAD NUMBER
  // adds zeros in front of the given 'number' until it is of the desired
  // 'length', then returns it as a string
  function padNumber(number, length){
    var num = number + '';

    while (num.length < length) {
      num = '0' + num;
    }

    return num;
  }

  // PARSE TIME
  // parses a time given the time since the UNIX epoch in seconds
  function parseTime(seconds) {
    var sec, date, ret;
    sec = (seconds * 1000);
    date = new Date(sec);

    ret = padNumber(date.getUTCDate(), 2) + '.' + padNumber((date.getUTCMonth() + 1), 2) + '.' + padNumber(date.getUTCFullYear(), 2) + ' @ ' + padNumber(date.getUTCHours(), 2) + ':' + padNumber(date.getUTCMinutes(), 2) + ':' + padNumber(date.getUTCSeconds(), 2);

    return ret;
  }

  // API KEY
  // give the code the API key to use when making AJAX requests for
  // JSON data
  var APIkey = '';

      var companyStatsId = 55; // ERE20201006 - add a unique stats ID for the current company/property

      // INITIALIZATION
      var intervalCounter, msTimestamp, specialNote, windowLocation, simpleAnalytics_data;

      window.onload = function() {
          intervalCounter = (0 - updateInterval);
          msTimestamp = Date.now();
          let saveClientTimestamp = msTimestamp; // ERE20210118
          // change file name to analytix.php - ERE20210118
          // Insert a call to the server for UTC time. Check to see if the user's system time is correct  - ERE20210112
          ajaxCall(analyticsFolder + 'analytix.php', 
            'action=9',
            'POST',
            function(resp) {
              let server = JSON.parse(resp);
              let serverTime = server.UTCTimeStamp;
              // Check that msTimestamp falls within a day's boundary of X seconds prior and X seconds in the future
              if (isInDateRange(serverTime, msTimestamp, 300)) { // Range is currently set to 5 minutes (300 seconds) // ERE20210118
                // Do nothing
              } else {
                // console.log('***> server time is being used for the date stamp. the bad stamp is: ', msTimestamp); 
                msTimestamp = serverTime;
              }
              let diff = serverTime - saveClientTimestamp 
              // console.log('*-*-*-*-*-> jsTimestamp: ' + saveClientTimestamp + ' servertime: ' + serverTime + ' <-*-*-*-*-*-> diff: ' + diff + ' milliseconds');
              specialNote = document.getElementById(scriptElementId).getAttribute('note');
              windowLocation = escape(window.location.href);
              simpleAnalytics_data = new Array();
              // console.log('-+-+-+-+-+>>>> companyStatsId: ', companyStatsId); // ERE20201118
              update();
              setInterval(update, (updateInterval * 1000));
            }
          );
      };

      // Date range check on the client's time stamp.  If the client's timestamp is outside of the specified range
      // plus or minus, then use the Server timestamp instead.
      function isInDateRange(serverTime, clientTime, timeRangeInSec) {
        const oneDayPrior = serverTime - (timeRangeInSec * 1000);
        const oneDayFuture = serverTime + (timeRangeInSec * 1000);
        if ( oneDayPrior <= clientTime && clientTime <= oneDayFuture) {
          // console.log('*****>*****> The client\'s time stamp is WITHIN range');
          return true;
        }
        // console.log('*****>>>>>>');
        // console.log('*****>*****> The client\'s time stamp is OUT of range <<<<******');
        // console.log('*****>>>>>>');
        return false; 
      }

      // UPDATE
      function update() {
          intervalCounter += updateInterval;
          // ERE20201006 - CompanyStatsId was added to the Ajax call
          
          // change file name to analytix.php - ERE20210118
          ajaxCall(analyticsFolder + 'analytix.php',
                  'windowLocation=' + windowLocation + '&msTimestamp=' + msTimestamp + '&specialNote=' + specialNote + '&intervalCounter=' + intervalCounter + '&companyStatsId=' + companyStatsId,
                  'POST',
                  function(resp) {
                      simpleAnalytics_data = JSON.parse(resp);
                      //alert(simpleAnalytics_data.visitorStamp);
                      //alert(resp);
                      //console.log('****====>>>> update() response: ', JSON.parse(resp)); // ERE202010118
                  }
              );
      }