public Rover(IPlanet planet)
{
_planet = planet;
_currentPosition = new Position(new Point(0, 0), Direction.North, planet);
_commandLookup = new Dictionary <char, Func <IMovePostion> >
{
{ 'F', () => _currentPosition.Forward() },
{ 'B', () => _currentPosition.Backward() },
{ 'L', () => _currentPosition.TurnLeft() },
{ 'R', () => _currentPosition.TurnRight() }
};
}
public MoveResult Move(string commands)
{
if (string.IsNullOrWhiteSpace(commands))
{
throw new ArgumentException($"Commands can't empty. {nameof(commands)}");
}
if (commands.ToCharArray().Any(c => !_validCommands.Contains(c)))
{
throw new InvalidMoveCommandException("Invalid command detected");
}
foreach (var command in commands)
{
var nextPosition = _commandLookup[command]();
if (IsObstacle(nextPosition.Coordinate))
{
return(MoveResult.CreateObstacleResult(_currentPosition.Coordinate, nextPosition.Coordinate.Point));
}
_currentPosition = nextPosition;
}
return(MoveResult.CreateMoveResult(_currentPosition.Coordinate));
}
