# All files / lib/geocoder yandexgeocoder.js

80.39% Statements 41/51
59.09% Branches 13/22
100% Functions 9/9
80.39% Lines 41/51

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     'use strict';

    var util = require('util');
    var AbstractGeocoder = require('./abstractgeocoder');

    /**
     * Constructor
     * @param <object> httpAdapter Http Adapter
     * @param <object> options     Options (language, clientId, apiKey)
     */
    var YandexGeocoder = function YandexGeocoder(httpAdapter, options) {
      YandexGeocoder.super_.call(this, httpAdapter, options);
    };

    util.inherits(YandexGeocoder, AbstractGeocoder);

    function _findKey(result, wantedKey) {
      var val = null;
      Object.keys(result).every(function(key) {

      if (key === wantedKey) {
        val = result[key];
        return false;
      }

      if (typeof result[key] === 'object') {
        val = _findKey(result[key], wantedKey);

        return val === null ? true : false;
      }

      return true;
      });

      return val;
    }

    function _formatResult(result) {
      var position = result.GeoObject.Point.pos.split(' ');
      result = result.GeoObject.metaDataProperty.GeocoderMetaData.AddressDetails;

      return {
        'latitude' : parseFloat(position[1]),
        'longitude' : parseFloat(position[0]),
        'city' : _findKey(result, 'LocalityName'),
        'state' : _findKey(result, 'AdministrativeAreaName'),
        'streetName': _findKey(result, 'ThoroughfareName'),
        'streetNumber' : _findKey(result, 'PremiseNumber'),
        'countryCode' : _findKey(result, 'CountryNameCode'),
        'country' : _findKey(result, 'CountryName')
      };
    }

    function _processOptionsToParams(params, options){

      //language (language_region, ex: `ru_RU`, `uk_UA`)
      Iif (options.language) {
        params.lang = options.language;
      }

      //results count (default 10)
      Iif (options.results) {
        params.results = options.results;
      }

      //skip count (default 0)
      Iif (options.skip) {
        params.skip = options.skip;
      }

      //Type of toponym (only for reverse geocoding)
      //could be `house`, `street`, `metro`, `district`, `locality`
      Iif (options.kind) {
        params.kind = options.kind;
      }

      //BBox (ex: `[[lat: 1.0, lng:2.0],[lat: 1.1, lng:2.2]]`)
      Iif (options.bbox) {
        if (options.bbox.length === 2){
          params.kind = options.bbox[0].lng + ',' + options.bbox[0].lat;
          params.kind = params.kind + '~';
          params.kind = params.kind + options.bbox[1].lng + ',' + options.bbox[1].lat;
        }
      }

      //Limit search in bbox (1) or not limit (0)
      Iif (options.rspn) {
        params.rspn = options.rspn;
      }
    }

    // Yandex geocoding API endpoint
    YandexGeocoder.prototype._endpoint = 'https://geocode-maps.yandex.ru/1.x/';

    /**
    * Geocode
    * @param <string>   value    Value to geocode (Address)
    * @param <function> callback Callback method
    */
    YandexGeocoder.prototype._geocode = function(value, callback) {
      var params = {
        geocode : value,
        format: 'json'
      };

      _processOptionsToParams(params, this.options);

      this.httpAdapter.get(this._endpoint, params, function(err, result) {
        Iif (err) {
          return callback(err);
        } else {
          var results = [];

          result.response.GeoObjectCollection.featureMember.forEach(function(geopoint) {
            results.push(_formatResult(geopoint));
          });

          results.raw = result;
          callback(false, results);
        }
      });
    };

    /**
     * Reverse geocoding
     * @param {lat:<number>,lon:<number>}  lat: Latitude, lon: Longitude
     * @param <function> callback Callback method
     */
    YandexGeocoder.prototype._reverse = function (query, callback) {
      var lat = query.lat;
      var lng = query.lon;

      var value = lng + ',' + lat;

      this._geocode(value, callback);
    };

    module.exports = YandexGeocoder;