class TutorialViewController: UIViewController {
    // MARK: - Properties
    var pageIndex: Int = 0
    var presentAnimation: UIViewControllerAnimatedTransitioning? = TutorialAnimation()
    var dismissAnimation: UIViewControllerAnimatedTransitioning? = TutorialAnimation()
    
    // MARK: IBOutlets
    @IBOutlet weak var pageControl: UIPageControl!
    @IBOutlet weak var backgroundImage: UIView!
    
    // MARK: - Initialization
    override func awakeFromNib() {
        super.awakeFromNib()
        setup()
    }
    
    func setup() {
        // Override me to set pageIndex, prevAnimationCoordinator, and nextAnimationCoordiantor
    }
    
    // MARK: - View Lifecycle
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        self.pageControl.currentPage = pageIndex
        
        // Hack to fix rotation issues
        self.rotateTopView(view: view)
    }
    
    // MARK: - Navigation
    func showNext() {
        performSegue(withIdentifier: "next", sender: self)
    }
    
    func showPrevious() {
        performSegue(withIdentifier: "unwind", sender: self)
    }
    
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "next" {
            if let destinationVC = segue.destination as? TutorialViewController {
                destinationVC.delegate = delegate
            }
        }
        
        super.prepare(for: segue, sender: sender)
    }
    
    // MARK: - IBActions
    @IBAction func changePage(_ sender: UIPageControl) {
        let index = sender.currentPage
        
        if index <= self.pageIndex {
            showPrevious()
        } else {
            showNext()
        }
    }
    
    @IBAction func unwindToPreviousTutorial(_ sender: UIStoryboardSegue) {
        
    }
    
}