import UIKit
import FocusableImageView

class ViewController: UIViewController {
    @IBOutlet private weak var stackView: UIStackView!
    private let manager = FocusableImageViewManager()
    private var imageViews: [FocusableImageView] { stackView.arrangedSubviews as! [FocusableImageView] }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        manager.register(parentViewController: self, imageViews: imageViews)
    }
}

imageView.inner.kf.setImage(url) // Set Image URL with Kingfisher

manager.delegate = self

extension ViewController: FocusableImageViewDelegate {
    func selectableImageViewPresentAnimation(views: [FocusableImageView]) {
        views.forEach { $0.inner.layer.cornerRadius = 0 }
    }
    
    func selectableImageViewDismissAnimation(views: [FocusableImageView]) {
        views.forEach { $0.inner.layer.cornerRadius = 8 }
    }
}

manager.configuration = .init(
    backgroundColor: .init(white: 0, alpha: 0.5),
    animationDuration: 0.5,
    pageControlConfiguration: .init(hidesForSinglePage: false, pageIndicatorTintColor: nil, currentPageIndicatorTintColor: nil),
    maximumZoomScale: 2,
    createDismissButton: { (parentView) -> UIButton in
        let button = UIButton()
        button.translatesAutoresizingMaskIntoConstraints = false
        button.setTitle("Close", for: .normal)
        button.setTitleColor(.white, for: .normal)
        button.titleLabel?.font = UIFont.systemFont(ofSize: 16)
        parentView.addSubview(button)
        NSLayoutConstraint.activate([
            button.leadingAnchor.constraint(equalTo: parentView.leadingAnchor, constant: 16),
            button.topAnchor.constraint(equalTo: parentView.safeAreaLayoutGuide.topAnchor, constant: 16),
        ])
        return button
    }
)

FocusableImageViewConfiguration.default = configuration