import AppKit

final class AppDelegate: NSObject, NSApplicationDelegate {
    func applicationDidFinishLaunching(_ notification: Notification) {
        // Run as a menu-bar accessory (no Dock icon, no main window).
        // LSUIElement in Info.plist already enforces this; set it explicitly too
        // so behavior is unambiguous regardless of how the app is launched.
        NSApp.setActivationPolicy(.accessory)
        terminateOtherInstances()
    }

    /// Single-instance: a fresh launch (e.g. each Xcode ⌘R) terminates any older
    /// copies so you never end up with two menu-bar icons.
    private func terminateOtherInstances() {
        guard let bundleID = Bundle.main.bundleIdentifier else { return }
        let me = NSRunningApplication.current.processIdentifier
        for app in NSRunningApplication.runningApplications(withBundleIdentifier: bundleID)
        where app.processIdentifier != me {
            app.terminate()
        }
    }

    /// If a recording is in progress when the user quits, finalize it (flush WAV
    /// headers) before the process exits, so the session isn't corrupted.
    func applicationShouldTerminate(_ sender: NSApplication) -> NSApplication.TerminateReply {
        guard let controller = SessionController.shared, controller.isBusy else {
            return .terminateNow
        }
        Task { @MainActor in
            await controller.prepareForTermination()
            NSApp.reply(toApplicationShouldTerminate: true)
        }
        return .terminateLater
    }
}