(function () {
  /*---------------------
  --------- API ---------
  ----------------------*/
  window.flatworld.utils.dataManipulation = setupDataManipulation();

  /*---------------------
  -------- PUBLIC -------
  ----------------------*/
  /**
   * These are utils for manipulating the data, that our classes and functions use.
   *
   * @class utils.dataManipulation
   * @return {Object}      mapObjectsToArray, flattenArrayBy1Level
   */
  function setupDataManipulation() {
    /*---------------------
    ------- API ----------
    --------------------*/
    return {
      mapObjectsToArray,
      flattenArrayBy1Level,
    };

    /*----------------------
    ------- PUBLIC ---------
    ----------------------*/
    /**
     * Changes the data from e.g. getting objects from the map based on coordinate. The data is like this normally:
     * {
     *   units: [{
     *     {... the objects datas ...}
     *   }]
     * }
     * We change it to this:
     * [
     *   [{
     *     {... the objects datas ...}
     *   }]
     * ]
     *
     * @method mapObjectsToArray
     * @param  {Object} objects       Object that holds objects
     * @return {Array}                Returns the transformed array
     */
    function mapObjectsToArray(objects) {
      return Object.keys(objects).map(objGroup => {
        return objects[objGroup];
      });
    }
    /**
     * @method flattenArrayBy1Level
     * @param  {Array} objects
     */
    function flattenArrayBy1Level(objects) {
      let merged = [];

      return merged.concat.apply(merged, objects);
    }
  }
})();