//
//  CustomSwitchContainer.swift
//  MullvadVPN
//
//  Created by pronebird on 20/05/2021.
//  Copyright © 2025 Mullvad VPN AB. All rights reserved.
//

import UIKit

class CustomSwitchContainer: UIView {
    static let borderEdgeInsets = UIEdgeInsets(top: 3, left: 3, bottom: 3, right: 3)

    private let borderShape: CAShapeLayer = {
        let shapeLayer = CAShapeLayer()
        shapeLayer.borderColor = UIColor.Switch.borderColor.cgColor
        shapeLayer.borderWidth = 2
        shapeLayer.cornerCurve = .continuous
        return shapeLayer
    }()

    let control = CustomSwitch()

    var isEnabled: Bool {
        get {
            control.isEnabled
        }
        set {
            control.isEnabled = newValue
            updateBorderOpacity()
        }
    }

    override var accessibilityIdentifier: String? {
        didSet {
            control.accessibilityIdentifier = accessibilityIdentifier
        }
    }

    override var intrinsicContentSize: CGSize {
        controlSize()
    }

    override func sizeThatFits(_ size: CGSize) -> CGSize {
        controlSize()
    }

    override init(frame: CGRect) {
        super.init(frame: frame)

        addSubview(control)
        layer.addSublayer(borderShape)

        control.sizeToFit()
        sizeToFit()

        borderShape.cornerRadius = bounds.height * 0.5
        borderShape.frame = bounds

        updateBorderOpacity()
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override func layoutSubviews() {
        super.layoutSubviews()

        control.frame.origin = CGPoint(x: Self.borderEdgeInsets.left, y: Self.borderEdgeInsets.top)
    }

    // MARK: - Private

    private func controlSize() -> CGSize {
        var size = control.bounds.size
        size.width += Self.borderEdgeInsets.left + Self.borderEdgeInsets.right
        size.height += Self.borderEdgeInsets.top + Self.borderEdgeInsets.bottom
        return size
    }

    private func updateBorderOpacity() {
        CATransaction.begin()
        CATransaction.setDisableActions(true)

        borderShape.opacity = control.isEnabled ? 1 : 0.2

        CATransaction.commit()
    }
}