fforte/lib/screens/excursion/widgets/tracking.dart

import 'dart:async';

import 'package:fforte/l10n/app_localizations.dart';
import 'package:fforte/screens/addCam/services/geolocator_service.dart';
import 'package:fforte/screens/helper/add_entries_dialog_helper.dart';
import 'package:fforte/screens/helper/snack_bar_helper.dart';
import 'package:fforte/services/tracking_service.dart';
import 'package:flutter/material.dart';
import 'package:flutter_map/flutter_map.dart';
import 'package:flutter_map_location_marker/flutter_map_location_marker.dart';
import 'package:geolocator/geolocator.dart';
import 'package:latlong2/latlong.dart';

class Tracking extends StatefulWidget {
  final Position startPosition;
  final TextEditingController weg;
  const Tracking({super.key, required this.startPosition, required this.weg});

  @override
  State<Tracking> createState() => _TrackingState();
}

class _TrackingState extends State<Tracking> {
  final TrackingService _trackingService = TrackingService();
  LocationMarkerPosition? locationMarkerPosition;
  MapController mapController = MapController();
  StreamSubscription? _positionSubscription;

  @override
  void initState() {
    super.initState();

    if (widget.weg.text.isNotEmpty) {
      for (var element in widget.weg.text.split(";")) {
        List<String> posSplit = element.split(",");
        try {
          posSplit[0] = posSplit[0].substring(0, 9);
          posSplit[1] = posSplit[1].substring(0, 9);
        } on RangeError {
          // ignore because the double is short enough then
        }

        _trackingService.pathList.add(
          LatLng(double.parse(posSplit.first), double.parse(posSplit[1])),
        );
      }
    }

    locationMarkerPosition = LocationMarkerPosition(
      latitude: widget.startPosition.latitude,
      longitude: widget.startPosition.longitude,
      accuracy: widget.startPosition.accuracy,
    );

    _positionSubscription = _trackingService.positionStream$.listen((position) {
      setState(() {
        locationMarkerPosition = LocationMarkerPosition(
          latitude: position.latitude,
          longitude: position.longitude,
          accuracy: position.accuracy,
        );
      });
    });

    GeolocatorService.alwaysPositionEnabled().then((value) {
      if (!value && mounted) {
        Navigator.of(context).pop();
        SnackBarHelper.showSnackBarMessage(context, "${AppLocalizations.of(context)!.locationForbidden} ${AppLocalizations.of(context)!.oder} ${AppLocalizations.of(context)!.locationDisabled}");
      }
    });
  }

  @override
  void dispose() {
    _positionSubscription?.cancel();
    widget.weg.text = _trackingService.getPathAsString();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(AppLocalizations.of(context)!.tracking),
        leading: IconButton(
          onPressed: () {
            Navigator.pop(context);
          },
          icon: Icon(Icons.arrow_back_rounded)
        ),
        actions: [
          if (!_trackingService.isTracking)
            IconButton(
              onPressed: () async {
                bool delete = await AddEntriesDialogHelper.deleteCompleteRouteDialog(context);
                if (delete) {
                  setState(() {
                    _trackingService.clearPath();
                  });
                }
              },
              icon: Icon(
                Icons.delete,
                color: Theme.of(context).colorScheme.errorContainer,
              ),
            ),
          if (_trackingService.isTracking)
            TextButton(
              onPressed: () {
                setState(() {
                  _trackingService.stopTracking();
                });
              },
              child: Text(AppLocalizations.of(context)!.trackingStop),
            ),
          TextButton(
            onPressed: () {
              setState(() {
                if (_trackingService.isTracking) {
                  _trackingService.pauseTracking();
                } else {
                  if (_trackingService.positionStream == null) {
                    _trackingService.startTracking(context);
                  } else {
                    _trackingService.resumeTracking();
                  }
                }
              });
            },
            child: _trackingService.isTracking
                ? Text(AppLocalizations.of(context)!.trackingPause)
                : Text(AppLocalizations.of(context)!.trackingStart),
          ),
        ],
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          mapController.move(
            LatLng(
              locationMarkerPosition!.latitude,
              locationMarkerPosition!.longitude,
            ),
            16,
          );
        },
        child: Icon(Icons.my_location),
      ),
      body: FlutterMap(
        mapController: mapController,
        options: MapOptions(
          interactionOptions: const InteractionOptions(
            flags: InteractiveFlag.pinchZoom |
                InteractiveFlag.drag |
                InteractiveFlag.pinchMove,
          ),
          initialCenter: LatLng(
            widget.startPosition.latitude,
            widget.startPosition.longitude,
          ),
          initialZoom: 16.0,
        ),
        children: [
          TileLayer(
            urlTemplate: 'https://tile.openstreetmap.org/{z}/{x}/{y}.png',
            userAgentPackageName: 'de.lupus.apps',
          ),
          if (_trackingService.pathList.isNotEmpty)
            PolylineLayer(
              polylines: [
                Polyline(
                  strokeWidth: 2.0,
                  points: _trackingService.pathList,
                  color: Colors.red
                ),
              ],
            ),
          CurrentLocationLayer(),
        ],
      ),
    );
  }
}