namespace Day23;

public class Tile
{
    public char Value { get; }
    public Vec Position { get; }

    public bool IsPath => Value == '.' || IsArrow;
    public bool IsArrow => Value == '<' || Value == '>' || Value == '^' || Value == 'v';

    public Tile(char value, Vec position)
    {
        Value = value;
        Position = position;
    }

    public IEnumerable<Vec> Neighbors()
    {
        yield return Position.Add(Vec.Up);
        yield return Position.Add(Vec.Right);
        yield return Position.Add(Vec.Down);
        yield return Position.Add(Vec.Left);
    }

    public Vec Previous()
    {
        return Position.Subtract(ArrowDirection());
    }

    public Vec Next()
    {
        return Position.Add(ArrowDirection());
    }

    public Vec ArrowDirection()
    {
        return Value switch
        {
            '^' => Vec.Up,
            'v' => Vec.Down,
            '<' => Vec.Left,
            '>' => Vec.Right,
            _ => Vec.Zero
        };
    }
}