public void SpinToWin()
{
var x = new Position(0, 3);
var y = new Position(0, 3);
var rover = new Rover(x, y, FacingDirection.N);
rover.RotateLeft();
Assert.Equal(FacingDirection.W, rover.FacingDirection);
Assert.Equal(FacingDirection.E, rover.OppositeFacingDirection);
rover.RotateRight();
Assert.Equal(FacingDirection.N, rover.FacingDirection);
Assert.Equal(FacingDirection.S, rover.OppositeFacingDirection);
rover.RotateRight();
rover.RotateRight();
rover.RotateRight();
Assert.Equal(FacingDirection.W, rover.FacingDirection);
Assert.Equal(FacingDirection.E, rover.OppositeFacingDirection);
rover.RotateRight();
Assert.Equal(FacingDirection.N, rover.FacingDirection);
Assert.Equal(FacingDirection.S, rover.OppositeFacingDirection);
}
public void Process(string commands)
{
var commandChain = commands.Select <char, Action>(c => c switch
{
'F' => () => { EnsureCanMove(MoveDirection.F); rover.Move(MoveDirection.F); }
,
'B' => () => { EnsureCanMove(MoveDirection.B); rover.Move(MoveDirection.B); }
,
'L' => () => rover.RotateLeft(),
'R' => () => rover.RotateRight(),
_ => throw new NotSupportedException()
});
private string ParseRoverInstructions(string[] instructions)
{
StringBuilder output = new StringBuilder();
for (int i = 1; i < instructions.Length; i += 2)
{
var startPosLine = instructions[i];
if (!IsValidPosition(startPosLine)) // verify the start position is in the valid format
{
output.AppendLine($"Warning: Invalid start position for Rover #{i / 2}. Sipping rover commands.");
continue;
}
var startPos = instructions[i].Split(' ');
Rover rover = new Rover(int.Parse(startPos[0]), int.Parse(startPos[1]), startPos[2]);
if (!IsInBounds(rover.Position)) // verify that the given start position is in bounds of the plateau
{
output.AppendLine($"Warning: Invalid start position for Rover #{i / 2}. Sipping rover commands.");
continue;
}
var commands = instructions[i + 1];
if (!IsValidCommands(commands)) // verify that the commands are in the valid format
{
output.AppendLine($"Warning: Invalid commands for Rover #{i / 2}. Sipping rover commands.");
continue;
}
foreach (var command in commands)
{
switch (command)
{
case 'L':
case 'l':
rover.RotateLeft();
break;
case 'R':
case 'r':
rover.RotateRight();
break;
case 'M':
case 'm':
if (IsInBounds(rover.GetNextPosition()))
{
rover.Position = rover.GetNextPosition();
}
else
{
output.AppendLine($"Warning: Cannot move Rover #{i / 2} out of bounds. Move command ignored.");
}
break;
}
}
// send updated position back to NASA
output.AppendLine(rover.ToString());
}
return(output.ToString());
}
