{
  "users" : {
    "-LTTvwvs5OMaKO6pyZb-" : {
      "accountId" : 1001,
      "createdAt" : "2018-12-11 15:22:55",
      "email" : "john@doe.com",
      "fcmToken" : "duhfkNCIKW8:APA91bGgbzVCcagIhIw8DYFN_LVIKcjtyUiZEk0mxd3QLYkxRjQuGXdSfZMPcvw4maytKef-GXMEFrpH_lLz5QY0OV7qvwtyOll9jjKMH0vEWJUGIyp1iGQ4NZIMQE3kmZ-jZ8kF-1Bc",
      "updatedAt" : "2018-12-11 15:22:55"
    },
    "-LTTwH8BdMe6W1lmhb-b" : {
      "accountId" : 1001,
      "createdAt" : "2018-12-11 15:24:22",
      "email" : "john@doe.com",
      "fcmToken" : "e_86qbjpjLE:APA91bHyVEgeH8aZMrn7213ws0-oXeTpdFRwY-FDcAbkQkMnaCdSNp9he6-AvQ0AUIsX-TywAxuWLCZ9BqIRsuyx1ZD9reD6wMeqtfP1swONq-rF6vQzet61DUbLfPXdlZhvxEjI9Cpz",
      "updatedAt" : "2018-12-11 15:24:22"
    },
    "-LTTwNcoaQYri1paUwVD" : {
      "accountId" : 1001,
      "createdAt" : "2018-12-11 15:24:48",
      "email" : "john@doe.com",
      "fcmToken" : "e_86qbjpjLE:APA91bHyVEgeH8aZMrn7213ws0-oXeTpdFRwY-FDcAbkQkMnaCdSNp9he6-AvQ0AUIsX-TywAxuWLCZ9BqIRsuyx1ZD9reD6wMeqtfP1swONq-rF6vQzet61DUbLfPXdlZhvxEjI9Cpz",
      "updatedAt" : "2018-12-11 15:24:48"
    },
    "-LTUv-aBEaQDrvvMrlAG" : {
      "accountId" : 1001,
      "createdAt" : "2018-12-11 18:58:25",
      "email" : "john@doe.com",
      "fcmToken" : "eOaNDdd2DXI:APA91bGzgcudlScng9TuEgSUY9ahA2pXVgl7AKxmkdX9ubw6uA5livNcJUlcI5pHYwn9fI7kc_9od5AbGrXm4wZPul_gI7qcGarTQTwkxq9zEKgovX0nWDDpDtNCLiWIaON6MWu5XLbW",
      "updatedAt" : "2018-12-11 18:58:25"
    }
  }
}

func storeToFirebaseDatabase() {

    let ref = Database.database().reference()
    let usersRef = ref.child("users")

    let id = usersRef.childByAutoId().key
    let fcmToken = UserDefaults.standard.string(forKey: "fcmToken")

    consoleLog(fcmToken)

    let values =
        ["accountId": loginAccount.id!,
         "email": loginAccount.username,
         "fcmToken": fcmToken
            ] as [String : Any]

    ref.root.child("users").observe(DataEventType.value, with: { (snapshot) in

        if snapshot.exists() {

            for child in snapshot.children {
                let token = (child as! DataSnapshot).childSnapshot(forPath: "fcmToken").value as! String

                if(token != fcmToken){

                    usersRef.child(id!).setValue(values, withCompletionBlock: { (err, ref) in
                        if err != nil {
                            print(err.self as Any)
                            return
                        }
                        print("Successfully saved user in Firebase DB")

                    })

                    break
                }

            }

        }


    }) { (error) in
        print(error.localizedDescription)
    }
}