import BackgroundTasks
import SwiftUI
import UIKit
import UserNotifications

@main
struct ShaanxiUnionMonitorApp: App {
    @UIApplicationDelegateAdaptor(AppDelegate.self) private var appDelegate
    @Environment(\.scenePhase) private var scenePhase
    @State private var monitor = VideoMonitor()

    init() {
        BackgroundRefreshService.register()
    }

    var body: some Scene {
        WindowGroup {
            MonitorView(monitor: monitor)
                .onAppear {
                    appDelegate.monitor = monitor
                    monitor.start()
                }
        }
        .onChange(of: scenePhase) { _, phase in
            if phase == .background {
                BackgroundRefreshService.schedule()
            }
        }
    }
}

final class AppDelegate: NSObject, UIApplicationDelegate, UNUserNotificationCenterDelegate {
    weak var monitor: VideoMonitor?

    func application(
        _ application: UIApplication,
        didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]? = nil
    ) -> Bool {
        UNUserNotificationCenter.current().delegate = self
        return true
    }

    func application(
        _ application: UIApplication,
        didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data
    ) {
        let token = deviceToken.map { String(format: "%02x", $0) }.joined()
        UserDefaults.standard.set(token, forKey: VideoMonitor.DefaultsKey.deviceToken)
        Task { @MainActor in
            monitor?.handleDeviceToken(token)
        }
    }

    func application(
        _ application: UIApplication,
        didFailToRegisterForRemoteNotificationsWithError error: Error
    ) {
        Task { @MainActor in
            monitor?.remoteNotificationStatus = "APNs 注册失败：\(error.localizedDescription)"
        }
    }

    func userNotificationCenter(
        _ center: UNUserNotificationCenter,
        willPresent notification: UNNotification
    ) async -> UNNotificationPresentationOptions {
        [.banner, .list, .sound]
    }
}