<!--
// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
-->
<import src="../data/cities.sky" as="cities" />
<script>
function CityDataService(cities) {
  this.cities = cities;

  // sort by state, city name.
  this.cities.sort(function(a, b) {
    if (a.state != b.state) {
      return a.state < b.state ? -1 : 1;
    }

    return a.name < b.name ? -1 : 1;
  });
}

CityDataService.prototype.get = function(index, count) {
  var self = this;

  return new Promise(function(fulfill) {
    var result = [];
    while (count-- > 0) {
      while (index < 0) {
        index += self.cities.length;
      }
      if (index >= self.cities.length)
        index = index % self.cities.length;

      result.push(self.cities[index]);
      index++;
    }

    fulfill(result);
  });
}

module.exports = {
  service: new Promise(function(fulfill) {
    fulfill(new CityDataService(cities));
  })
};
</script>