import SubmitTransition

var bin: TKTransitionSubmitButton!

btn = TKTransitionSubmitButton(frame: CGRect(x: 0, y: 0, width: self.view.frame.size.width - 64, height: 44))
btn.center = self.view.center
btn.frame.bottom = self.view.frame.height - 60
btn.setTitle("Sign in", for: UIControlState())
btn.titleLabel?.font = UIFont(name: "HelveticaNeue-Light", size: 14)
self.view.addSubview(btn)

func didStartYourLoading() {
  btn.startLoadingAnimation()
}

func didFinishYourLoading() {
  btn.startFinishAnimation {
    //Your Transition
    let secondVC = SecondViewController()
    secondVC.transitioningDelegate = self
    self.presentViewController(secondVC, animated: true, completion: nil)
  }
}

// start loading the button animations
button.startLoadingAnimation()

// run query in background thread
async.background {
  let query = PFQuery(className: "Blah")
  query.whereKey("user", equalTo: user)
	let results = try! query.findObjects()
  
	if results.count == 0 {
		// insert alertView telling user that their details don't work
	}
	else {
		// return to main thread to complete login
		async.main {
                        // tell the button to finish its animations
			button.startFinishingAnimation(1) {
			        let sb = UIStoryboard(name: "Main", bundle: nil)
	            	        let vc = sb.instantiateViewController(withIdentifier: "MainVC")
			        vc.transitioningDelegate = self
			        self.present(vc, animated: true, completion: nil)
                        }
		}
	}

func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
  return TKFadeInAnimator(transitionDuration: 0.5, startingAlpha: 0.8)
}

func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
  return nil
}

// MARK: UIViewControllerTransitioningDelegate
func animationControllerForPresentedController(presented: UIViewController, presentingController presenting: UIViewController, sourceController source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
  let fadeInAnimator = TKFadeInAnimator()
  return fadeInAnimator
}

func animationControllerForDismissedController(dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
  return nil
}