(function () {
  var Diller = window.Diller = window.Diller || {};

  function toDate(unknown) {
    if (!unknown) {
      return undefined;
    } else if (moment.isMoment(unknown)) {
      return unknown;
    } else if (typeof unknown === 'string') {
      unknown = unknown.trim();

      if (unknown == '') {
        return moment();
      }

      return moment(unknown, 'YYYY-MM-DDTHH:mm.sssZ');
    } else if (typeof unknown === 'string' || moment.isDate(unknown)) {
      return moment(unknown);
    } else {
      return undefined;
    }
  }

  Diller.Interval = function (from, to) {
    var f = toDate(from),
      t = toDate(to);

    if (f.isAfter(t)) {
      var tmp = f;
      f = t;
      t = tmp;
    }

    return {
      getFrom: function () {
        return f || moment();
      },
      getTo: function () {
        return t || moment();
      },
      toString: function () {
        return 'yo'
      }
    };
  };

  Diller.Interval.create = function (value) {
    if (value instanceof Diller.Interval) {
      return value;
    }

    return new Diller.Interval.hours(24);
  };

  Diller.Interval.hours = function (hours) {
    var to = moment();
    var from = to.subtract(hours, 'hours');
    return new Diller.Interval(from, to);
  };
})();