(function () {
  function extractData(res) {
    return res && res.data;
  }

  function Property($http, DillerRpc, propertyId) {

    /**
     * @param {Diller.Interval} interval
     * @returns {Promise}
     */
    function getInterval(interval) {
      var req = DillerRpc.getValuesReq(propertyId);
      req.params = {};
      var from = interval.getFrom();
      if(from.isValid()) {
        req.params.from = from.toISOString();
      }

      var to = interval.getTo();
      if(to.isValid()) {
        req.params.to = to.toISOString();
      }

      req.params.aggregateLevel = interval.getLevel();

      return $http(req).then(extractData);
    }

    /** @lends Property.prototype */
    return {
      getInterval: getInterval
    };
  }

  function Device($http, DillerRpc, deviceId) {
    var properties = {};

    /**
     * @param propertyId
     * @returns {Property}
     */
    function getProperty(propertyId) {
      var p = properties[propertyId];

      if (!p) {
        p = new Property($http, DillerRpc, propertyId);
        properties[propertyId] = p;
      }

      return p;
    }

    /** @lends Device.prototype */
    return {
      getProperty: getProperty
    };
  }

  function DillerClient($timeout, $http, DillerRpc) {

    var devices = {};

    function getDevice(deviceId) {
      var d = devices[deviceId];

      if (!d) {
        d = new Device($http, DillerRpc, deviceId);
        devices[deviceId] = d;
      }

      return d;
    }

    /** @lends DillerClient.prototype */
    return {
      getDevice: getDevice
    };
  }

  angular
    .module('diller.client', [])
    .service('DillerClient', DillerClient)
    .service('DillerRpc', window.DillerRpc);
})();