/**
 - P is a preferred English name
 - Q is a preferred name (in other languages)
 - V is a well-known (but unofficial) variant for the place
 (e.g. "New York City" for New York)
 - S is either a synonym or a colloquial name for the place
 (e.g. "Big Apple" for New York), or a version of the name which
 is stripped of accent characters.
 - A is an abbreviation or code for the place (e.g. "NYC" for New
 York)
 */
// config mapping of old names to new ones
var NAME_MAP = {
  'alpha3': 'country_a',
  'admin0': 'country',
  'admin1': 'region',
  'admin1_abbr': 'region_a',
  'admin2': 'county',
  // TODO: what does "local_admin" map to in WOF???
  'neighborhood': 'neighbourhood'
};

function setup() {

  return mapPlacenames;
}

function mapPlacenames(req, res, next) {

  // do nothing if no result data set
  if (!req.results.data) {
    return next();
  }

  // loop through data items and remap placenames
  req.results.data = req.results.data.map(renameProperties);

  next();
}

function renameProperties(place) {
  var newPlace = {};
  Object.keys(place).forEach(function (property) {
    renameProperty(place, newPlace, property);
  });
  return newPlace;
}

function renameProperty(oldObj, newObj, property) {
  if (!oldObj.hasOwnProperty(property)) {
    return;
  }

  newObj[ (NAME_MAP[property] || property) ] = oldObj[property];
}

module.exports = setup;