addDeviation method

Implementation

Future<bool> addDeviation({
  required int deviationPointIndex,
  required double deviationLength,
  required double deviationDistance,
  required double skipDistance,
}) async {
  // Validate input parameters
  if (deviationPointIndex < 0 ||
      deviationPointIndex >= _currentRoute.value.length - 1) {
    throw RangeError('Deviation point index out of bounds');
  }

  if (deviationLength <= 0 || deviationDistance <= 0 || skipDistance <= 0) {
    throw ArgumentError('Deviation parameters must be positive values');
  }

  // Find the starting point of the deviation
  final startPoint = _currentRoute.value[deviationPointIndex];

  // Find the approximate reconnection point based on skipDistance
  int reconnectionIndex = deviationPointIndex;
  double accumulatedDistance = 0.0;

  while (reconnectionIndex < _currentRoute.value.length - 1 &&
      accumulatedDistance < skipDistance) {
    accumulatedDistance += _currentRoute.value[reconnectionIndex]
        .distanceTo(_currentRoute.value[reconnectionIndex + 1]);
    reconnectionIndex++;
  }

  if (reconnectionIndex >= _currentRoute.value.length - 1) {
    reconnectionIndex = _currentRoute.value.length - 1;
  }

  final reconnectionPoint = _currentRoute.value[reconnectionIndex];

  // Calculate a deviation path using OSRM
  try {
    final deviationPath = await _calculateDeviationPath(
      startPoint: startPoint,
      endPoint: reconnectionPoint,
      deviationDistance: deviationDistance,
      deviationLength: deviationLength,
    );

    if (deviationPath.isEmpty) {
      return false;
    }

    // Apply the deviation to the current route
    _currentRoute.value = [
      ..._currentRoute.value.sublist(0, deviationPointIndex),
      ...deviationPath,
      ..._currentRoute.value.sublist(reconnectionIndex + 1),
    ];

    // Record the applied deviation
    _appliedDeviations.value.add({
      'deviationPointIndex': deviationPointIndex,
      'deviationLength': deviationLength,
      'deviationDistance': deviationDistance,
      'skipDistance': skipDistance,
      'appliedAt': DateTime.now().toIso8601String(),
    });

    return true;
  } catch (e) {
    debugPrint('Failed to add deviation: $e');
    return false;
  }
}