private List <Point> NeighborsKeysOnly(Point node, Dictionary <Point, char> map)
{
var neighbors = new List <Point>();
var potentialNeighbors = node.AdjacentInMainDirections();
foreach (var potentialNeighbor in potentialNeighbors)
{
if (map.TryGetValue(potentialNeighbor, out char mapItem))
{
switch (mapItem.ToString())
{
case "#":
continue;
case "@":
case ".":
case var _ when KeyPattern.IsMatch(mapItem.ToString()):
case var x when DoorPattern.IsMatch(mapItem.ToString()):
neighbors.Add(potentialNeighbor);
break;
default:
throw new Exception("Unknown map item");
}
}
}
return(neighbors);
}
private static bool IsIntersection(Point aPoint, Dictionary <Point, int> map)
{
return(map[aPoint] == '#' && aPoint.AdjacentInMainDirections().All(p => map.ContainsKey(p) && map[p] == '#'));
}
private static bool AdjacentToPortal(Point p, Dictionary <Point, char> mapData)
{
var neighbors = p.AdjacentInMainDirections();
return(neighbors.Any(n => mapData.TryGetValue(n, out char data) && char.IsLetter(data)));
}
