FireDepartmentGAS

fireDepartmentGAS.js

function doGet(request) {
  var encodedAddress = request.parameters.address;
  var address = decodeURIComponent(encodedAddress);
  var location = geocode(address);
  var fusionStations = queryFusionForStations(location).rows;
  var fireStations = createFireStationsFrom(fusionStations);
  var stations = distanceMatrix(location,fireStations);
  var response = {'address':address,'stations':stations};
  return ContentService.createTextOutput(JSON.stringify(stations))
    .setMimeType(ContentService.MimeType.JSON);
}

function geocode(address){
  var geocoder = Maps.newGeocoder();
  var response = geocoder.geocode(address)["results"][0].geometry.location;
  return response;
}

function queryFusionForStations(geocodedAddress){
  var fusionTableId = '1zLRiJwiWQotCP9f51sy_AByZEuDLcd8Zyk5tok1K';
  var queryString = "SELECT * FROM " + fusionTableId + " ORDER BY ST_DISTANCE(location, LATLNG(" + geocodedAddress['lat'] + "," + geocodedAddress['lng'] +")) LIMIT 10";
  var result = FusionTables.Query.sqlGet(queryString, {hdrs: false});     
  return result;
}

function createFireStationsFrom(fusionStations){
  var fireStations = [];
  for(i=0; i<fusionStations.length; i++){
    var fireStation = {'name':fusionStations[i][0], 'address':fusionStations[i][1], 'lat':fusionStations[i][8], 'lng':fusionStations[i][7] }
    fireStations[i] = fireStation;
  }
  return fireStations;
}

function distanceMatrix(origin, fireStations){
  var url = createMatrixUrl(origin, fireStations);
  var response = UrlFetchApp.fetch(url);
  var json = response.getContentText();
  var distances = JSON.parse(json).rows[0].elements;
  var stations = addDistanceToStations(distances, fireStations);
  return stations;
}

function addDistanceToStations(distances, stations){
  for(i=0;i<stations.length;i++){
    stations[i]["distanceText"] = distances[i].distance.text;
    stations[i]["distance"] = distances[i].distance.value
  }
  return stations;
};
                    
function createMatrixUrl(origin, fireStations){
  var matrixUrl = 'https://maps.googleapis.com/maps/api/distancematrix/json?';
  var parameters = "origins=" + createOriginString(origin) + "&destinations="+createDestinationsString(fireStations); 
  var key = 'YOURKEY'
  matrixUrl = matrixUrl + parameters + '&units=imperial' + '&key=' + key;
  return matrixUrl;
}    

function createDestinationsString(fireStations){
  var destinationStrings = [];
  for(i=0; i<fireStations.length; i++){
    var coords = [fireStations[i]['lat'],fireStations[i]['lng']];
    destinationStrings[i]=coords.join(",")
  }
  return encodeURIComponent(destinationStrings.join("|"));
}

function createOriginString(origin){
  return [origin['lat'],origin['lng']].join(",");
}