AdventOfCode23/Day16/Tile.cs

namespace Day16;

public class Tile
{
    private readonly ISet<IRay> _processed = new HashSet<IRay>();
    public int X { get; }
    public int Y { get; }
    public char Value { get; }
    public bool IsEnergized { get; private set; }

    public Tile(int x, int y, char value)
    {
        X = x;
        Y = y;
        Value = value;
    }

    public IEnumerable<IRay> Process(IRay incoming)
    {
        if (_processed.Contains(incoming))
        {
            yield break;
        }
        IsEnergized = true;
        _processed.Add(incoming);
        switch (Value)
        {
            case '/':
                yield return incoming.IsHorizontal ? incoming.Rotate() : incoming.AntiRotate();
                break;
            case '\\':
                yield return incoming.IsVertical ? incoming.Rotate() : incoming.AntiRotate();
                break;
            case '|':
                if (incoming.IsHorizontal)
                {
                    yield return incoming.Rotate();
                    yield return incoming.AntiRotate();
                }
                else
                {
                    yield return incoming;
                }
                break;
            case '-':
                if (incoming.IsVertical)
                {
                    yield return incoming.Rotate();
                    yield return incoming.AntiRotate();
                }
                else
                {
                    yield return incoming;
                }
                break;
            default:
                yield return incoming;
                break;
        }
    }

    public void Clear()
    {
        IsEnergized = false;
        _processed.Clear();
    }
}