import AppKit

final class AppDelegate: NSObject, NSApplicationDelegate {
    private var overlayWindowController: OverlayWindowController!
    private var hotKeyManager: HotKeyManager!
    private var serviceChecker: ServiceChecker!

    func applicationDidFinishLaunching(_ notification: Notification) {
        NSApp.setActivationPolicy(.accessory) // visible menu-less app

        serviceChecker = ServiceChecker()
        overlayWindowController = OverlayWindowController(serviceChecker: serviceChecker)
        overlayWindowController.showIfMenuBarVisible()

        hotKeyManager = HotKeyManager()
        hotKeyManager.registerGlobalHotKey(modifiers: [.command, .option, .shift], key: .p) { [weak self] in
            self?.overlayWindowController.showContextMenu()
        }

        // Observe screen/space/menu bar visibility changes
        DistributedNotificationCenter.default().addObserver(self, selector: #selector(handleConfigChange), name: NSNotification.Name("com.apple.HIToolbox.inputSourceChanged"), object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(handleConfigChange), name: NSApplication.didChangeScreenParametersNotification, object: nil)
        NSWorkspace.shared.notificationCenter.addObserver(self, selector: #selector(spaceChanged), name: NSWorkspace.activeSpaceDidChangeNotification, object: nil)

        serviceChecker.start()
    }

    @objc private func handleConfigChange() {
        overlayWindowController.recomputeFrameAndVisibility()
    }

    @objc private func spaceChanged() {
        overlayWindowController.recomputeFrameAndVisibility()
    }
}