(function (global) {

  // Check for defined globals
  global.az = global.az || {};
  global.az.globals = global.az.globals || {} ;

})(window);



(function(){
  // debugging zeugs:
  if (typeof(localStorage) !== 'undefined' && typeof(JSON) !== 'undefined'){

    var suspect = '';

    var getCookie = function(cname) {
      var name = cname + "=";
      var ca = document.cookie.split(';');
      for(var i=0; i<ca.length; i++) {
          var c = ca[i];
          while (c.charAt(0) === ' ') c = c.substring(1);
          if (c.indexOf(name) === 0) return c.substring(name.length,c.length);
      }
      return "";
    };

    var setCookie = function(cname, cvalue, exdays) {
      var d = new Date();
      d.setTime(d.getTime() + (exdays*24*60*60*1000));
      var expires = "expires="+d.toUTCString();
      document.cookie = cname + "=" + cvalue + "; " + expires;
    };

    var VERSION = '1';
    var STORAGE_VERSION_KEY = 'ls_sdebug_version';
    var STORAGE_KEY = 'ls_sdebug'; // name of localstore variable
    var MAX_LEN = 3; // maximum length of history entires

    var new_log = {
      'version': VERSION,
      'client_id': null,
      'agent': navigator.userAgent,
      'url': window.location.href,
      'user_id': null,
      'user_email': null,
      'user_info': null,
      'sid': null,
      'auth': false,
      'users': JSON.parse(localStorage.getItem('users') || '[]'),
      'cookies': document.cookie,
      'datetime': (new Date()).toISOString(),
      'navigator_cookie_enabled': navigator.cookieEnabled || null,
      'navigator_do_not_track': navigator.doNotTrack || null,
      'navigator_vendor': navigator.vendor || null
    };

    var last_log = null;

    var storage_version = localStorage.getItem(STORAGE_VERSION_KEY);
    if (!storage_version || storage_version != VERSION) {
      localStorage.setItem(STORAGE_VERSION_KEY, VERSION);
      localStorage.setItem(STORAGE_KEY, JSON.stringify([]));
      setCookie('lsdebugcid', '', 365);
      setCookie('lsdebugs', '', 365);
    }

    // get history array. make sure it does not get too big
    var my_history = localStorage.getItem(STORAGE_KEY);
    if (my_history) {
      my_history = JSON.parse(my_history);
      if (my_history.length > 0) {
        last_log = my_history[my_history.length-1];
      }
    } else{
      my_history = [];
    }

    if (typeof(az.globals.user) != "undefined"){
      new_log.user_info = az.globals.user;
      new_log.user_id = az.globals.user.id;
      email = az.globals.user.email;
      new_log.user_email = email;
      var found = false;
      for(var i=0; i < new_log.users.length; i++) {
        if (new_log.users[i] == email) {
          found = true;
          break;
        }
      }
      if (!found) {
        new_log.users.push(email);
        localStorage.setItem('users', JSON.stringify(new_log.users));
        if (new_log.users.length > 1) {
          suspect += 'multiuser';
        }
      }
    }

    var sid_cookie = getCookie('lsdebug');
    if (sid_cookie && sid_cookie.indexOf(".")>0){
      var sids = sid_cookie.split(".");
      new_log.auth = sids[sids.length-1];
      new_log.sid = sids[0];
    }

    var client_id = getCookie('lsdebugcid');
    var initial_session = getCookie('lsdebugs');
    new_log.original_sid = initial_session;

    if (!client_id || !initial_session){
      // reset
      var d = new Date();
      client_id = new_log.datetime;
      // make a nice random id with 4 chars/nums
      client_id += '-'+(("0000" + (Math.random()*Math.pow(36,4) << 0).toString(36)).slice(-4));
      setCookie('lsdebugcid', client_id, 365);
      setCookie('lsdebugs', new_log.sid, 365);
      my_history = [];
      last_log = null;
      suspect += 'new cid';
    }

    new_log.client_id = client_id;

    if (last_log) {
      if(last_log.sid != new_log.sid){
        if (last_log.user_email != new_log.user_email) {
          suspect += 'sid and user change';
        } else {
          suspect += 'unexpected sid change;';
        }
      }
    }

    my_history.push(new_log);
    if (my_history.length>MAX_LEN){
      my_history.splice(0,my_history.length-MAX_LEN);
    }
      localStorage.setItem(STORAGE_KEY, JSON.stringify(my_history));

    if (suspect){
      if (!last_log){
        last_log = {
          'sid': '',
        };
      }
      var url = '/__api/v1/debug_uid_change?cid='+client_id+'&old='+last_log.sid+"&new="+new_log.sid+"&suspect="+escape(suspect)+"&data="+escape(JSON.stringify(my_history));
      var xhttp;
      if (window.XMLHttpRequest) {
        xhttp = new XMLHttpRequest();
      } else {
        xhttp = new ActiveXObject("Microsoft.XMLHTTP");
      }
      xhttp.open('GET', url, true);
      xhttp.send();
    }
  }
})();