import SwiftUI
import UIKit

/// Zielbildschirm, der über Home-Screen-Shortcut oder URL angesprungen wird.
enum Route: String {
    case checkin
    case checkout
}

final class Router: ObservableObject {
    @Published var route: Route?

    func handle(shortcut type: String) {
        if type.hasSuffix("checkin") { route = .checkin }
        if type.hasSuffix("checkout") { route = .checkout }
    }

    /// projectgood://checkin bzw. projectgood://checkout
    func handle(url: URL) {
        guard url.scheme == "projectgood" else { return }
        let target = (url.host ?? url.path.replacingOccurrences(of: "/", with: "")).lowercased()
        if let route = Route(rawValue: target) { self.route = route }
    }
}

@main
struct ProjectGoodApp: App {
    @UIApplicationDelegateAdaptor(AppDelegate.self) private var appDelegate
    @StateObject private var session = Session.shared
    @StateObject private var router = Router()

    var body: some Scene {
        WindowGroup {
            RootView()
                .environmentObject(session)
                .environmentObject(router)
                .onOpenURL { router.handle(url: $0) }
                .onAppear {
                    if let type = AppDelegate.pendingShortcut {
                        router.handle(shortcut: type)
                        AppDelegate.pendingShortcut = nil
                    }
                }
                .onReceive(NotificationCenter.default.publisher(for: AppDelegate.shortcutNotification)) { note in
                    if let type = note.object as? String { router.handle(shortcut: type) }
                }
        }
    }
}

/// Nimmt Home-Screen-Quick-Actions entgegen (auch beim Kaltstart).
final class AppDelegate: NSObject, UIApplicationDelegate {
    static let shortcutNotification = Notification.Name("ProjectGoodShortcut")
    static var pendingShortcut: String?

    func application(_ application: UIApplication,
                     didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]? = nil) -> Bool {
        if let item = launchOptions?[.shortcutItem] as? UIApplicationShortcutItem {
            AppDelegate.pendingShortcut = item.type
        }
        return true
    }

    // Bewusst die Variante mit Completion-Handler: Bei der async-Fassung muesste
    // das nicht-Sendable UIApplicationShortcutItem ueber eine Actor-Grenze
    // gereicht werden (Warnung heute, Fehler im Swift-6-Sprachmodus).
    func application(_ application: UIApplication,
                     performActionFor shortcutItem: UIApplicationShortcutItem,
                     completionHandler: @escaping (Bool) -> Void) {
        NotificationCenter.default.post(name: AppDelegate.shortcutNotification, object: shortcutItem.type)
        completionHandler(true)
    }
}