SideStore/SideStoreApp/Sources/SideStoreUIKit/Components/BannerCollectionViewCell.swift

//
//  BannerCollectionViewCell.swift
//  AltStore
//
//  Created by Riley Testut on 3/23/20.
//  Copyright © 2020 Riley Testut. All rights reserved.
//

import UIKit

@objc
final class BannerCollectionViewCell: UICollectionViewCell {
    private(set) var errorBadge: UIView?
    @IBOutlet private(set) var bannerView: AppBannerView!

    override func awakeFromNib() {
        super.awakeFromNib()

        contentView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        contentView.preservesSuperviewLayoutMargins = true

        if #available(iOS 13.0, *) {
            let errorBadge = UIView()
            errorBadge.translatesAutoresizingMaskIntoConstraints = false
            errorBadge.isHidden = true
            self.addSubview(errorBadge)

            // Solid background to make the X opaque white.
            let backgroundView = UIView()
            backgroundView.translatesAutoresizingMaskIntoConstraints = false
            backgroundView.backgroundColor = .white
            errorBadge.addSubview(backgroundView)

            let badgeView = UIImageView(image: UIImage(systemName: "exclamationmark.circle.fill"))
            badgeView.preferredSymbolConfiguration = UIImage.SymbolConfiguration(scale: .large)
            badgeView.tintColor = .systemRed
            errorBadge.addSubview(badgeView, pinningEdgesWith: .zero)

            NSLayoutConstraint.activate([
                errorBadge.centerXAnchor.constraint(equalTo: self.bannerView.trailingAnchor, constant: -5),
                errorBadge.centerYAnchor.constraint(equalTo: self.bannerView.topAnchor, constant: 5),

                backgroundView.centerXAnchor.constraint(equalTo: badgeView.centerXAnchor),
                backgroundView.centerYAnchor.constraint(equalTo: badgeView.centerYAnchor),
                backgroundView.widthAnchor.constraint(equalTo: badgeView.widthAnchor, multiplier: 0.5),
                backgroundView.heightAnchor.constraint(equalTo: badgeView.heightAnchor, multiplier: 0.5)
            ])

            self.errorBadge = errorBadge
        }
    }
}