var TimeTracker = function(opt_bucket) {
  if (opt_bucket) {
    this.bucket_ = opt_bucket.sort(this.sortNumber); 
  } else {
    this.bucket_ = TimeTracker.DEFAULT_BUCKET;
  }
};

TimeTracker.prototype.startTime_;
TimeTracker.prototype.stopTime_;
TimeTracker.prototype.bucket_;
TimeTracker.DEFAULT_BUCKET = [100, 500, 1500, 2500, 5000];

TimeTracker.prototype._getTimeDiff = function() {
  return (this.stopTime_ - this.startTime_);
};

TimeTracker.prototype.sortNumber = function(a, b) {
  return (a - b);
}

TimeTracker.prototype._recordStartTime = function(opt_time) {
  if (opt_time != undefined) {
    this.startTime_ = opt_time;
  } else {
    this.startTime_ = (new Date()).getTime();
  }
};

TimeTracker.prototype._recordEndTime = function(opt_time) {
  if (opt_time != undefined) {
    this.stopTime_ = opt_time;
  } else {
    this.stopTime_ = (new Date()).getTime();
  }
};

TimeTracker.prototype._track = function(tracker,
                                        opt_event_obj_name,
                                        opt_event_label) {
  var eventTracker;
  if (opt_event_obj_name != undefined && opt_event_obj_name.length != 0) {
    eventTracker = tracker._createEventTracker(opt_event_obj_name);
  } else {
    eventTracker = tracker._createEventTracker('Carregamento de Pagina');
  }

  var i;
  var bucketString;
  for(i = 0; i < this.bucket_.length; i++) {
    if ((this._getTimeDiff()) < this.bucket_[i]) {
      if (i == 0) {
        bucketString = "0-" + (this.bucket_[0]);
        break;
      } else {
        bucketString = this.bucket_[i - 1] + "-" + (this.bucket_[i] - 1);
        break;
      }
    }
  }
  if (!bucketString) {
    bucketString = this.bucket_[i - 1] + "+";
  }
  eventTracker._trackEvent(bucketString, opt_event_label, this._getTimeDiff());
};

TimeTracker.prototype._setHistogramBuckets = function(buckets_array) {
  this.bucket_ = buckets_array.sort(this.sortNumber);
};