public static int Part2Solution(long[] input)
{
int paintedAtLeastOnce = 0;
List <GridMark> gridMarks = new List <GridMark>();
var currentPosition = new GridMark(0, 0, Colors.Black);
var currentDirection = Direction.Up;
IntCodeProgram intCodeProgram = new IntCodeProgram(input);
while (true)
{
if (gridMarks.Count == 0)
{
currentPosition.Color = Colors.White;
}
else
{
currentPosition.Color = GetPositionColor(currentPosition, gridMarks);
}
if (currentPosition.Color == Colors.Black)
{
intCodeProgram.Input.Enqueue(0);
}
else
{
intCodeProgram.Input.Enqueue(1);
}
var type = intCodeProgram.Run();
if (type == Halt.Terminated)
{
Print(gridMarks);
return(paintedAtLeastOnce);
}
currentPosition.Color = (Colors)intCodeProgram.Output.Dequeue();
long directionToTurn = intCodeProgram.Output.Dequeue();
GridMark existingMark = gridMarks.SingleOrDefault(pos => pos.X == currentPosition.X && pos.Y == currentPosition.Y);
if (existingMark != null)
{
gridMarks.Remove(existingMark);
}
else
{
paintedAtLeastOnce++;
}
gridMarks.Add(new GridMark(currentPosition.X, currentPosition.Y, currentPosition.Color));
currentDirection = SetDirection(currentDirection, directionToTurn);
currentPosition = SetPosition(currentPosition, currentDirection);
}
}
private static Colors GetPositionColor(GridMark mark, List <GridMark> gridMarks)
{
var position = gridMarks.SingleOrDefault(pos => pos.X == mark.X && pos.Y == mark.Y);
if (position != null)
{
return(position.Color);
}
else
{
return(Colors.Black);
}
}
private static GridMark SetPosition(GridMark position, Direction direction)
{
switch (direction)
{
case Direction.Up:
position.Y++;
break;
case Direction.Right:
position.X++;
break;
case Direction.Down:
position.Y--;
break;
case Direction.Left:
position.X--;
break;
}
return(position);
}