Sven laptop
347 lines
12 KiB
Dart
347 lines
12 KiB
Dart
import 'dart:convert';
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import 'package:geolocator/geolocator.dart';
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import 'package:http/http.dart' as http;
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import 'package:latlong2/latlong.dart';
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import '../models/navigation.dart';
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/// Navigation Service using OpenStreetMap
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class NavigationService {
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// OSRM (OpenStreetMap Routing Machine) - free public service
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static const String _osrmBaseUrl = 'https://router.project-osrm.org/route/v1/car';
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/// Get current device location
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Future<NavigationPoint?> getCurrentLocation() async {
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try {
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final permission = await Geolocator.checkPermission();
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if (permission == LocationPermission.denied) {
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await Geolocator.requestPermission();
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}
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final position = await Geolocator.getCurrentPosition(
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desiredAccuracy: LocationAccuracy.high,
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);
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return NavigationPoint(
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latitude: position.latitude,
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longitude: position.longitude,
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name: 'Current Location',
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);
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} catch (e) {
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throw Exception('Failed to get location: $e');
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}
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}
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/// Get route between two points
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/// Uses OSRM for open routing without API key
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Future<NavigationRoute> getRoute({
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required NavigationPoint start,
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required NavigationPoint end,
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}) async {
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try {
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bool validCoord(double lat, double lon) {
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return lat.isFinite && lon.isFinite && lat >= -90 && lat <= 90 && lon >= -180 && lon <= 180;
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}
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if (!validCoord(start.latitude, start.longitude) || !validCoord(end.latitude, end.longitude)) {
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throw Exception('Invalid coordinates for routing: start=(${start.latitude},${start.longitude}) end=(${end.latitude},${end.longitude})');
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}
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// OSRM format: /route/v1/car/lon1,lat1;lon2,lat2
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final coordinates =
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'${start.longitude},${start.latitude};${end.longitude},${end.latitude}';
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final url =
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'$_osrmBaseUrl/$coordinates?overview=full&steps=true&geometries=geojson';
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final response = await http.get(Uri.parse(url));
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if (response.statusCode == 200) {
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final data = jsonDecode(response.body) as Map<String, dynamic>?;
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if (data == null) {
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throw Exception('Empty response from routing service');
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}
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if (data['code'] != 'Ok') {
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throw Exception('Route not found: ${data['message'] ?? 'Unknown error'}');
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}
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final routes = data['routes'] as List?;
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if (routes == null || routes.isEmpty) {
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throw Exception('No route found in response');
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}
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final routeData = routes.first as Map<String, dynamic>;
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return NavigationRoute.fromOsrmRouteData(
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routeData,
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start: start,
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end: end,
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);
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} else if (response.statusCode == 400) {
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// Bad request: OSRM couldn't parse coordinates. Fall back to a simple straight-line route.
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try {
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final distanceMeters = calculateDistance(start, end);
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final durationSec = (distanceMeters / 11.111111).toInt(); // assume ~40 km/h -> 11.11 m/s
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final leg = RouteLeg.fromPoints(points: [start, end], distance: distanceMeters, duration: durationSec, summary: 'Direct');
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return NavigationRoute(start: start, end: end, legs: [leg], totalDistance: distanceMeters, totalDuration: durationSec);
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} catch (e) {
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throw Exception('Failed to get route (400) and fallback failed: ${e.toString()}');
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}
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} else {
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throw Exception('Failed to get route: ${response.statusCode}');
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}
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} catch (e) {
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throw Exception('Navigation error: $e');
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}
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}
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/// Get a route that passes through the provided stops in the given order.
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Future<NavigationRoute> getRouteThroughStops({
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required List<NavigationPoint> stops,
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}) async {
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try {
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if (stops.length < 2) {
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throw Exception('At least two stops are required');
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}
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final coordinates = stops
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.map((stop) => '${stop.longitude},${stop.latitude}')
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.join(';');
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final url =
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'$_osrmBaseUrl/$coordinates?overview=full&steps=true&geometries=geojson&source=first&destination=last';
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final response = await http.get(Uri.parse(url));
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if (response.statusCode != 200) {
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throw Exception('Failed to get route: ${response.statusCode}');
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}
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final data = jsonDecode(response.body) as Map<String, dynamic>?;
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if (data == null) {
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throw Exception('Empty response from routing service');
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}
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if (data['code'] != 'Ok') {
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throw Exception('Route not found: ${data['message'] ?? 'Unknown error'}');
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}
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final routes = data['routes'] as List?;
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if (routes == null || routes.isEmpty) {
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throw Exception('No route found in response');
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}
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final routeData = routes.first as Map<String, dynamic>;
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return NavigationRoute.fromOsrmRouteData(
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routeData,
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start: stops.first,
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end: stops.last,
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);
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} catch (e) {
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throw Exception('Navigation error: $e');
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}
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}
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/// Get an optimized trip through multiple stops.
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/// Keeps the first and last stops fixed and lets OSRM order the intermediates.
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Future<OptimizedRouteResult> getOptimizedRouteThroughStops({
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required List<NavigationPoint> stops,
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}) async {
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try {
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if (stops.length < 2) {
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throw Exception('At least two stops are required');
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}
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final coordinates = stops
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.map((stop) => '${stop.longitude},${stop.latitude}')
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.join(';');
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final url =
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'https://router.project-osrm.org/trip/v1/car/$coordinates?overview=full&steps=true&geometries=geojson&source=first&destination=last&roundtrip=false';
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final response = await http.get(Uri.parse(url));
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if (response.statusCode != 200) {
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if (response.statusCode == 400) {
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// fallback: return simple ordered stops route
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final distanceMeters = _sumDistancesBetween(stops);
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final durationSec = (distanceMeters / 11.111111).toInt();
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final leg = RouteLeg.fromPoints(points: stops, distance: distanceMeters, duration: durationSec, summary: 'Fallback optimized trip');
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final route = NavigationRoute(start: stops.first, end: stops.last, legs: [leg], totalDistance: distanceMeters, totalDuration: durationSec);
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return OptimizedRouteResult(route: route, orderedStops: stops);
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}
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throw Exception('Failed to get optimized route: ${response.statusCode}');
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}
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final data = jsonDecode(response.body) as Map<String, dynamic>?;
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if (data == null) {
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throw Exception('Empty response from routing service');
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}
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if (data['code'] != 'Ok') {
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throw Exception('Optimized route not found: ${data['message'] ?? 'Unknown error'}');
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}
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final trips = data['trips'] as List?;
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if (trips == null || trips.isEmpty) {
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throw Exception('No optimized trip found');
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}
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final trip = trips.first as Map<String, dynamic>;
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final geometry = trip['geometry'] as Map<String, dynamic>?;
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final coordinatesData = geometry?['coordinates'] as List? ?? [];
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final points = coordinatesData
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.map((coord) {
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if (coord is List && coord.length >= 2) {
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return NavigationPoint(
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latitude: (coord[1] as num).toDouble(),
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longitude: (coord[0] as num).toDouble(),
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);
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}
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return null;
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})
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.whereType<NavigationPoint>()
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.toList();
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final waypointItems = (data['waypoints'] as List?) ?? [];
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final orderedPairs = <MapEntry<int, NavigationPoint>>[];
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for (var i = 0; i < waypointItems.length && i < stops.length; i++) {
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final waypoint = waypointItems[i];
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if (waypoint is! Map<String, dynamic>) continue;
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final index = waypoint['waypoint_index'] as num?;
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if (index == null) continue;
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orderedPairs.add(MapEntry(index.toInt(), stops[i]));
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}
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orderedPairs.sort((a, b) => a.key.compareTo(b.key));
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final orderedStops = orderedPairs.isNotEmpty
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? orderedPairs.map((entry) => entry.value).toList()
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: stops;
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final route = NavigationRoute(
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start: orderedStops.first,
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end: orderedStops.last,
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legs: [
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RouteLeg.fromPoints(
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points: points,
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distance: (trip['distance'] as num?)?.toDouble() ?? 0.0,
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duration: (trip['duration'] as num?)?.toInt() ?? 0,
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summary: 'Optimized trip',
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),
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],
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totalDistance: (trip['distance'] as num?)?.toDouble() ?? 0.0,
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totalDuration: (trip['duration'] as num?)?.toInt() ?? 0,
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);
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return OptimizedRouteResult(
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route: route,
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orderedStops: orderedStops.isNotEmpty ? orderedStops : stops,
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);
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} catch (e) {
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throw Exception('Navigation error: $e');
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}
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}
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/// Get multiple routes (alternatives)
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Future<List<NavigationRoute>> getMultipleRoutes({
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required NavigationPoint start,
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required NavigationPoint end,
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int alternatives = 2,
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}) async {
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try {
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final coordinates =
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'${start.longitude},${start.latitude};${end.longitude},${end.latitude}';
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final url =
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'$_osrmBaseUrl/$coordinates?overview=full&steps=true&geometries=geojson&alternatives=$alternatives';
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final response = await http.get(Uri.parse(url));
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if (response.statusCode == 200) {
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final data = jsonDecode(response.body) as Map<String, dynamic>?;
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if (data == null) {
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throw Exception('Empty response from routing service');
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}
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if (data['code'] != 'Ok') {
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throw Exception('Routes not found: ${data['message'] ?? 'Unknown error'}');
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}
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final routesData = data['routes'] as List?;
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if (routesData == null || routesData.isEmpty) {
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throw Exception('No routes found in response');
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}
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final routes = routesData
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.map((routeData) {
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if (routeData is! Map<String, dynamic>) return null;
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return NavigationRoute.fromOsrmRouteData(
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routeData,
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start: start,
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end: end,
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);
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})
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.whereType<NavigationRoute>()
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.toList();
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return routes;
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} else if (response.statusCode == 400) {
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// fallback: single straight-line route
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final distanceMeters = calculateDistance(start, end);
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final durationSec = (distanceMeters / 11.111111).toInt();
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final leg = RouteLeg.fromPoints(points: [start, end], distance: distanceMeters, duration: durationSec, summary: 'Direct');
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return [NavigationRoute(start: start, end: end, legs: [leg], totalDistance: distanceMeters, totalDuration: durationSec)];
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} else {
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throw Exception('Failed to get routes: ${response.statusCode}');
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}
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} catch (e) {
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throw Exception('Navigation error: $e');
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}
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}
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double _sumDistancesBetween(List<NavigationPoint> points) {
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var total = 0.0;
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for (var i = 0; i < points.length - 1; i++) {
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total += calculateDistance(points[i], points[i + 1]);
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}
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return total;
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}
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/// Calculate straight-line distance between two points
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double calculateDistance(NavigationPoint p1, NavigationPoint p2) {
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const distance = Distance();
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return distance(
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LatLng(p1.latitude, p1.longitude),
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LatLng(p2.latitude, p2.longitude),
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);
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}
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/// Geocode a place name to coordinates using Nominatim (OpenStreetMap)
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Future<NavigationPoint> geocodePlace(String name) async {
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try {
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final uri = Uri.https('nominatim.openstreetmap.org', '/search', {
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'q': name,
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'format': 'json',
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'limit': '1',
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});
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final response = await http.get(uri, headers: {
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'User-Agent': 'bus-terminal-app',
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});
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if (response.statusCode != 200) {
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throw Exception('Geocoding failed: ${response.statusCode}');
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}
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final list = jsonDecode(response.body) as List<dynamic>?;
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if (list == null || list.isEmpty) {
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throw Exception('No geocoding result for "$name"');
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}
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final item = list[0] as Map<String, dynamic>;
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final lat = double.parse(item['lat'] as String);
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final lon = double.parse(item['lon'] as String);
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final display = item['display_name'] as String? ?? name;
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return NavigationPoint(latitude: lat, longitude: lon, name: display);
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} catch (e) {
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throw Exception('Geocode error: $e');
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}
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}
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}
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