import AppKit
import SwiftUI

@MainActor
private final class AppDelegate: NSObject, NSApplicationDelegate {
    func applicationWillFinishLaunching(_ notification: Notification) {
        applyApplicationIcon()
    }

    func applicationDidFinishLaunching(_ notification: Notification) {
        applyApplicationIcon()
    }

    private func applyApplicationIcon() {
        guard let iconURL = Bundle.main.url(forResource: "mactaskmanager", withExtension: "icns"),
              let icon = NSImage(contentsOf: iconURL) else { return }
        NSApplication.shared.applicationIconImage = icon
    }
}

@main
struct MacTaskManagerApp: App {
    @NSApplicationDelegateAdaptor(AppDelegate.self) private var appDelegate
    @State private var monitor = SystemMonitor()

    var body: some Scene {
        WindowGroup("Task Manager") {
            ContentView()
                .environment(monitor)
                .frame(minWidth: 980, minHeight: 640)
                .task { monitor.start() }
        }
        .defaultSize(width: 1180, height: 760)
        .windowStyle(.hiddenTitleBar)
        .commands {
            CommandGroup(replacing: .newItem) { }
            CommandMenu("Options") {
                Button("Refresh now") { monitor.refresh() }
                    .keyboardShortcut("r", modifiers: .command)
                Divider()
                Button(monitor.isPaused ? "Resume updates" : "Pause updates") {
                    monitor.isPaused.toggle()
                }
                .keyboardShortcut("p", modifiers: .command)
            }
        }
    }
}