getDirections method

Future<List<Map<String, double>>> getDirections({ required double originLat, required double originLng, required double destLat, required double destLng, })

Fetch directions from origin to destination Returns list of LatLng points representing the route

Implementation

Future<List<Map<String, double>>> getDirections({
  required double originLat,
  required double originLng,
  required double destLat,
  required double destLng,
}) async {
  final url = Uri.parse(
    'https://api.olamaps.io/routing/v1/directions'
    '?origin=$originLat,$originLng'
    '&destination=$destLat,$destLng'
    '&api_key=$apiKey',
  );

  try {
    final response = await http.post(
      url,
      headers: {
        'X-Request-Id': DateTime.now().millisecondsSinceEpoch.toString(),
      },
    );

    if (response.statusCode == 200) {
      final data = json.decode(response.body);

      // Extract route coordinates from response
      if (data['routes'] != null && (data['routes'] as List).isNotEmpty) {
        final route = data['routes'][0];
        final geometry = route['overview_polyline'];

        if (geometry != null) {
          // Decode polyline to get coordinates
          return _decodePolyline(geometry);
        }
      }

      // Fallback: return direct line if no geometry
      return [
        {'lat': originLat, 'lng': originLng},
        {'lat': destLat, 'lng': destLng},
      ];
    } else {
      print('Routing API error: ${response.statusCode} - ${response.body}');
      // Return direct line on error
      return [
        {'lat': originLat, 'lng': originLng},
        {'lat': destLat, 'lng': destLng},
      ];
    }
  } catch (e) {
    print('Error fetching directions: $e');
    // Return direct line on error
    return [
      {'lat': originLat, 'lng': originLng},
      {'lat': destLat, 'lng': destLng},
    ];
  }
}