@preconcurrency import SwiftUI
#if targetEnvironment(macCatalyst)
    import UIKit

    // MARK: - Window Style

    /// Mac Catalyst window appearance styles.
    /// Controls title bar visibility and traffic light positioning.
    enum MacWindowStyle {
        case standard // Normal title bar with traffic lights
        case inline // Hidden title bar with repositioned traffic lights
    }

    // MARK: - UIWindow Extension

    /// UIWindow extension for accessing NSWindow in Mac Catalyst.
    /// Provides bridge to AppKit window functionality on macOS.
    extension UIWindow {
        /// Access the underlying NSWindow in Mac Catalyst
        var nsWindow: NSObject? {
            // Dynamic framework not available, return nil for now
            nil
        }
    }

    // MARK: - Window Manager

    /// Manages Mac Catalyst window customizations.
    /// Handles window style changes and traffic light button repositioning.
    @MainActor
    @Observable
    class MacCatalystWindowManager {
        static let shared = MacCatalystWindowManager()

        var windowStyle: MacWindowStyle = .standard

        private var window: UIWindow?
        private var windowResizeObserver: NSObjectProtocol?
        private var windowDidBecomeKeyObserver: NSObjectProtocol?
        private let logger = Logger(category: "MacCatalystWindow")

        // Traffic light button configuration
        private let trafficLightInset = CGPoint(x: 20, y: 20)
        private let trafficLightSpacing: CGFloat = 20

        private init() {}

        /// Configure the window with the specified style
        func configureWindow(_ window: UIWindow, style: MacWindowStyle) {
            self.window = window
            self.windowStyle = style

            // Wait for window to be fully initialized
            DispatchQueue.main.asyncAfter(deadline: .now() + 0.25) {
                self.applyWindowStyle(style)
            }

            // Observe window events
            setupWindowObservers()
        }

        /// Switch between window styles at runtime
        func setWindowStyle(_ style: MacWindowStyle) {
            windowStyle = style
            applyWindowStyle(style)
        }

        private func applyWindowStyle(_ style: MacWindowStyle) {
            guard let window,
                  let _ = window.nsWindow
            else {
                logger.warning("Unable to access NSWindow - Dynamic framework not available")
                return
            }

            // Dynamic functionality disabled for now
            logger.info("Mac Catalyst window styling disabled - Dynamic framework not available")
        }

        // Dynamic framework methods removed - not available without proper package integration

        private func setupWindowObservers() {
            // Window observation disabled - Dynamic framework not available
            logger.info("Window observation disabled - Dynamic framework not available")
        }

        deinit {
            // No observers to clean up since Dynamic framework is not available
        }
    }

    // MARK: - View Modifier

    /// View modifier for applying Mac Catalyst window styles.
    /// Configures window appearance when the view appears.
    struct MacCatalystWindowStyle: ViewModifier {
        let style: MacWindowStyle
        @State private var windowManager = MacCatalystWindowManager.shared

        func body(content: Content) -> some View {
            content
                .onAppear {
                    setupWindow()
                }
        }

        private func setupWindow() {
            guard let windowScene = UIApplication.shared.connectedScenes.first as? UIWindowScene,
                  let window = windowScene.windows.first
            else {
                return
            }

            windowManager.configureWindow(window, style: style)
        }
    }

    // MARK: - View Extension

    /// View extension for Mac Catalyst window configuration.
    /// Enables views to configure window style on Mac Catalyst builds.
    extension View {
        /// Configure the Mac Catalyst window style
        func macCatalystWindowStyle(_ style: MacWindowStyle) -> some View {
            modifier(MacCatalystWindowStyle(style: style))
        }
    }

#endif
