import 'dart:async';

import 'package:fforte/l10n/app_localizations.dart';
import 'package:fforte/services/notification_service.dart';
import 'package:flutter/material.dart';
import 'package:geolocator/geolocator.dart';
import 'package:latlong2/latlong.dart';

class TrackingService {
  static final TrackingService _instance = TrackingService._internal();
  factory TrackingService() => _instance;
  TrackingService._internal();

  List<LatLng> pathList = [];
  StreamSubscription<Position>? positionStream;
  bool isTracking = false;
  final _positionController = StreamController<Position>.broadcast();

  Stream<Position> get positionStream$ => _positionController.stream;

  Future<void> startTracking(BuildContext context) async {
    if (isTracking) return;

    await NotificationService().initNotification();
    if (context.mounted) {
    NotificationService().showNotification(
      title: AppLocalizations.of(context)!.trackingRunningInBackground,
    );
    }

    positionStream = Geolocator.getPositionStream(
      locationSettings: AndroidSettings(
        accuracy: LocationAccuracy.high,
        distanceFilter: 0,
        foregroundNotificationConfig: ForegroundNotificationConfig(
          notificationTitle: context.mounted ? AppLocalizations.of(context)!.trackingRunningInBackground : "Tracking",
          notificationText: "",
        ),
      ),
    ).listen((Position? position) {
      if (position != null) {
        pathList.add(LatLng(position.latitude, position.longitude));
        _positionController.add(position);
      }
    });

    positionStream!.onError((e) {
      NotificationService().deleteNotification();
      NotificationService().showNotification(title: "ERROR: $e");
    });

    isTracking = true;
  }

  void pauseTracking() {
    positionStream?.pause();
    isTracking = false;
  }

  void resumeTracking() {
    positionStream?.resume();
    isTracking = true;
  }

  void stopTracking() {
    positionStream?.cancel();
    NotificationService().deleteNotification();
    isTracking = false;
  }

  void clearPath() {
    pathList.clear();
  }

  String getPathAsString() {
    return pathList.map((pos) => "${pos.latitude},${pos.longitude}").join(";");
  }

  void dispose() {
    stopTracking();
    _positionController.close();
  }
}