import 'package:flutter_local_notifications/flutter_local_notifications.dart';

class NotifyService {
  static final NotifyService _instance = NotifyService._internal();

  factory NotifyService() => _instance;

  NotifyService._internal();

  late FlutterLocalNotificationsPlugin _notifications;

  // Android特殊模式，即使设备处于省电模式也能准时触发。
  final scheduleMode = AndroidScheduleMode.exactAllowWhileIdle;

  // 初始化通知服务
  Future<void> initialize() async {
    _notifications = FlutterLocalNotificationsPlugin();

    // 设置Android平台的初始化配置 使用应用图标作为通知图标
    const AndroidInitializationSettings androidSettings =
        AndroidInitializationSettings('@mipmap/ic_launcher');

    // 设置iOS平台的初始化配置
    const DarwinInitializationSettings iosSettings =
        DarwinInitializationSettings(
          requestAlertPermission: true,
          requestBadgePermission: true,
          requestSoundPermission: true,
        );

    // 初始化设置
    const InitializationSettings settings = InitializationSettings(
      android: androidSettings,
      iOS: iosSettings,
    );

    await _notifications.initialize(settings: settings);
  }

  // 创建Android通知详情
  AndroidNotificationDetails _androidNotificationDetails() {
    const channelId = 'com.cxx.sweet_chat_app';
    const channelName = '亲聊';
    const channelDescription = '亲聊通知';
    return const AndroidNotificationDetails(
      channelId,
      channelName,
      channelDescription: channelDescription,
      importance: Importance.high,
      priority: Priority.high,
      playSound: true,
      enableVibration: true,
    );
  }

  // 创建iOS通知详情
  DarwinNotificationDetails _iosNotificationDetails() {
    return const DarwinNotificationDetails(
      presentAlert: true,
      presentBadge: true,
      presentSound: true,
    );
  }

  NotificationDetails get _details {
    return NotificationDetails(
      android: _androidNotificationDetails(),
      iOS: _iosNotificationDetails(),
    );
  }

  // 立即显示通知
  Future<void> showInstantNotification({
    required String title,
    required String body,
    int id = 0,
  }) async {
    await _notifications.show(id: id, title: title, body: body, notificationDetails: _details);
  }

  // 检查通知权限
  Future<bool> checkPermission() async {
    final bool? result =
        await _notifications
            .resolvePlatformSpecificImplementation<
              AndroidFlutterLocalNotificationsPlugin
            >()
            ?.areNotificationsEnabled();
    return result ?? false;
  }

  // 请求权限
  Future<void> requestPermission() async {
    await _notifications
        .resolvePlatformSpecificImplementation<
          IOSFlutterLocalNotificationsPlugin
        >()
        ?.requestPermissions(alert: true, badge: true, sound: true);
  }
}