import SwiftUI
import UIKit

extension UIViewController {
    func embed(_ child: UIViewController) {
        addChild(child)
        view.insertSubview(child.view, belowSubview: view.subviews.first ?? view)
        child.view.pinEdges(to: view)
        child.didMove(toParent: self)
    }

    func embedOnTop(_ child: UIViewController) {
        addChild(child)
        view.insertSubview(child.view, aboveSubview: view)
        child.view.pinEdges(to: view)
        child.didMove(toParent: self)
    }

    func removeEmbedded(_ child: UIViewController) {
        child.willMove(toParent: nil)
        child.view.removeFromSuperview()
        child.removeFromParent()
    }
}

extension UIView {
    func pinEdges(to superview: UIView) {
        translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            leadingAnchor.constraint(equalTo: superview.leadingAnchor),
            trailingAnchor.constraint(equalTo: superview.trailingAnchor),
            topAnchor.constraint(equalTo: superview.topAnchor),
            bottomAnchor.constraint(equalTo: superview.bottomAnchor),
        ])
    }
}