private static bool Output(long status)
{
var previousPosition = droidPosition;
var attemptedPosition = Compass.PositionAfterMovement(droidPosition, Attempt);
if (status == 0)
{
// The repair droid hit a wall. Its position has not changed.
area.Set(attemptedPosition, Day15Cell.Wall);
Day15Debug.Set(attemptedPosition, Day15Cell.Wall);
Day15Debug.WriteLine("BLOCKED");
}
else
{
// The repair droid has moved one step in the requested direction.
Day15Debug.WriteLine("OK");
droidPosition = attemptedPosition;
if (!Backtracking)
{
area.Set(attemptedPosition, Day15Cell.Open);
Day15Debug.Set(attemptedPosition, Day15Cell.Open);
if (status == 2)
{
oxygenSystemPosition = attemptedPosition;
}
EnteredFrom[attemptedPosition] = Attempt;
Visited.Add(attemptedPosition);
Attempts.Push(Compass.AllDirections);
}
}
return((Attempts.Count() > 1) || (Attempts.Peek().Count > 0));
}
private static long Input()
{
var attempt = Attempts.Pop().Where(dir => !Visited.Contains(Compass.PositionAfterMovement(droidPosition, dir))).ToList();
if (attempt.Count == 0)
{
Backtracking = true;
Attempt = Compass.Opposite(EnteredFrom[droidPosition]);
}
else
{
Backtracking = false;
Attempt = attempt[0];
attempt.RemoveAt(0);
Attempts.Push(attempt);
}
var backTrackingString = Backtracking ? " (BACKTRACKING)" : "";
Day15Debug.Write($"({droidPosition.x}),{droidPosition.y}) - {Compass.Name(Attempt)}{backTrackingString} : ");
return(Compass.ToLong(Attempt));
}