FBSDKLogin Manager swift simple setup

//
//  ViewController.swift
//
//  Created by Alan Jaw on 2/29/16.
//  Copyright © 2016 Alan Jaw. All rights reserved.
//

import UIKit
import FBSDKLoginKit
import Firebase

let ref = Firebase(url: "https://xxxxxxxxxxxxx.firebaseio.com/")

class ViewController: UIViewController {
    
    @IBOutlet weak var facebookLoginButton: UIButton!
    
    @IBOutlet weak var facebookLogoutButton: UIButton!
    
    let facebookLoginManager = FBSDKLoginManager()

    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        hideShowLoginLogoutButtons()
        
        if (FBSDKAccessToken.currentAccessToken() != nil)
        {

        }
        else {

        }
    }
    
    override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)
        hideShowLoginLogoutButtons()
    }
    
    @IBAction func facebookLogoutButtonPressed(sender: UIButton) {
        facebookLoginManager.logOut()
        hideShowLoginLogoutButtons()

    }
    func hideShowLoginLogoutButtons() {
        if (FBSDKAccessToken.currentAccessToken() != nil) {
            // user logged in to facebook already
            facebookLoginButton.hidden = true
            facebookLogoutButton.hidden = false
            print ("already FBlogged in")
        }
        else {
            // user not logged in
            facebookLoginButton.hidden = false
            facebookLogoutButton.hidden = true
            print ("FB logged out")

        }

    }
    
    @IBAction func facebookLoginButtonPressed(sender: UIButton) {
        
        let facebookPermissionsBasic = ["public_profile", "email", "user_friends"]
        let facebookPermissionsExtensive = ["public_profile", "email", "user_friends", "user_education_history", "user_birthday"]

        facebookLoginManager.logInWithReadPermissions(facebookPermissionsExtensive, fromViewController: self) { (facebookResult, facebookError) -> Void in
            
            if facebookError != nil {
                print("Facebook login failed. Error \(facebookError)")
            }
            else if facebookResult.isCancelled {
                print("Facebook login was cancelled.")
            }
            else {
                let accessToken = FBSDKAccessToken.currentAccessToken().tokenString
                ref.authWithOAuthProvider("facebook", token: accessToken,
                    withCompletionBlock: { error, authData in
                        if error != nil {
                            print("Login failed. \(error)")
                        } else {
                            print("Logged in! \(authData)")
                            self.getFBUserInfo()
                        }
                })
            }
        }
    }
    
    func getFBUserInfo() {
        let facebookRequest = FBSDKGraphRequest(graphPath: "me", parameters: ["fields": "name, gender, picture, birthday, first_name, last_name"])
        
        facebookRequest.startWithCompletionHandler { (connection: FBSDKGraphRequestConnection!, result, error) -> Void in
            
            if error == nil {
                print ("result: \(result)")
                
                var r = result as! NSDictionary
                let firstName = r["first_name"]
                let gender = r["gender"]
                
                var dateFormatter = NSDateFormatter()
                dateFormatter.dateFormat = "MM/dd/yyyy"
                let birthday = dateFormatter.dateFromString(r["birthday"]! as! String)
                
                let facebookID = r["id"]!
                print ("facebookID: \(facebookID)")
                
                let urlString = "https://graph.facebook.com/\(facebookID)/picture?type=large"
                
                // get the URL of a larger picture
                let largerPicURL = NSURL(string: urlString)
                print (largerPicURL)
                let request = NSURLRequest(URL: largerPicURL!)

                NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue(), completionHandler: {
                    response, data, error in
                    
                    // TODO: save largerPic to DB
                    
                    
                    
                })
            }
                
            else { // facebookRequest.startWithCompletionHandler
                print (error)
            }
        }
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}