uplink.js~

var promise = require("promise");
var dataUpload=function(){
  var ret={};

  var firebase=require('firebase');
  var config = {
    apiKey: "AIzaSyAoNEwQvswWHIzTc0KYr5DiP0EUfeewjd4",
    authDomain: "iot-steppermotorcontrol.firebaseapp.com",
    databaseURL: "https://iot-steppermotorcontrol.firebaseio.com",
    storageBucket: "iot-steppermotorcontrol.appspot.com",
    messagingSenderId: "470513976629"
  };
  firebase.initializeApp(config);
  var candidates=firebase.database().ref('candidates');  
  var users=firebase.database().ref('users');
  ret.updateVote=function(candidate, user){
  candidates.child(candidate).child("votes").transaction(function(votes){
	 return (parseInt(votes)||0)+1;
	  });
  users.child(user).child("voted").transaction(function(voted){
	  return true;
	  });
  };
  ret.checkUser=function(ssn){
	  console.log("checking for user "+ ssn);
	var p = new promise(function(resolve, reject){
  	users.child(ssn).once('value').then(function(snapshot){
	console.log(snapshot.val());
	resolve(snapshot.val().voted);
	},function(){
		resolve(false);
	});
	});
	return p;
  };

 return ret;
};
module.exports=dataUpload();