//Made by Lumaa

import SwiftUI
import UIKit

@Observable
public class AppDelegate: NSObject, UIWindowSceneDelegate, Sendable, UIApplicationDelegate {
    public var window: UIWindow?
    public private(set) var windowWidth: CGFloat = UIScreen.main.bounds.size.width
    public private(set) var windowHeight: CGFloat = UIScreen.main.bounds.size.height
    
    public func scene(_ scene: UIScene, willConnectTo _: UISceneSession, options _: UIScene.ConnectionOptions) {
        guard let windowScene = scene as? UIWindowScene else { return }
        window = windowScene.keyWindow
    }
    
    override public init() {
        super.init()
        windowWidth = window?.bounds.size.width ?? UIScreen.main.bounds.size.width
        windowHeight = window?.bounds.size.height ?? UIScreen.main.bounds.size.height
        Self.observedSceneDelegate.insert(self)
        _ = Self.observer // just for activating the lazy static property
    }
    
    deinit {
        Task { @MainActor in
            Self.observedSceneDelegate.remove(self)
        }
    }
    
    private static var observedSceneDelegate: Set<AppDelegate> = []
    private static let observer = Task {
        while true {
            try? await Task.sleep(for: .seconds(0.1))
            for delegate in observedSceneDelegate {
                let newWidth = delegate.window?.bounds.size.width ?? UIScreen.main.bounds.size.width
                if delegate.windowWidth != newWidth {
                    delegate.windowWidth = newWidth
                }
                let newHeight = delegate.window?.bounds.size.height ?? UIScreen.main.bounds.size.height
                if delegate.windowHeight != newHeight {
                    delegate.windowHeight = newHeight
                }
                
            }
        }
    }
}