/* Place model */
module.exports = {

  attributes: {

    name: {
      type: 'string',
      required: true
    },

    // This is the attribute used for the place's geolocation.
    // Be careful to store it as [ lng, lat ] or else geoNear queries will give imprecise results.
    coordinates: {
      type: 'json',
      required: true
    }

  },

  /**
   * Find places closer than a certain distance (in km) from a specified location [ lng, lat ].
   * @param conditions
   * JSON object should look like this:
   * {
   *   lng: -72.213,
   *   lat: 45.012,
   *   maxDistance: 100,
   *   limit: 20,
   * }
   *
   * @param callback (err, results)
   * Returns an array of results (ordered by increasing distance), it looks like this:
   * [
   *   {
   *   dis: 10.321,
   *   obj: { JSON object of Place }
   *   },
   *   {
   *   dis: 20.123,
   *   obj: { JSON object of Place }
   *   }
   * ]
   */
  findNear: function (conditions, callback) {

    Place.native(function (err, collection) {
      if (err) return callback(err);

      collection.geoNear({
          type: "Point" ,
          coordinates: [ conditions.lng, conditions.lat ]
      }, {
        limit: conditions.limit || 30,
        maxDistance: conditions.maxDistance * 1000.0,
        distanceMultiplier: 0.001,
        spherical : true
      }, function (err, places) {
        if (err) return callback(err);

        return callback(null, places.results);
      });
    });

  }

};