SlimeDream/utility/GodotExtensions.cs

public static class GodotExtensions
{
	public static T GetParentOrThrow<T>(this Node node)
		where T : class
	{
		var parent = node.GetParent();
		if (parent == null) throw new InvalidOperationException($"Parent of {node} is null");
		if (parent is not T result) throw new InvalidCastException($"Parent of {node} is {node.GetType()}, not {typeof(T)}");
		return result;
	}

	public static T GetNodeOrThrow<T>(this Node parent, NodePath path)
		where T : class
	{
		var node = parent.GetNodeOrNull(path);
		if (node == null) throw new InvalidOperationException($"Could not find node {path} from {parent}");
		if (node is not T result) throw new InvalidCastException($"Node {path} from {parent} is {node.GetType()}, not {typeof(T)}");
		return result;
	}


	public static (Corner, Corner) GetCorners(this Side side)
		=> side switch {
			Side.Left   => (Corner.BottomLeft , Corner.TopLeft    ),
			Side.Top    => (Corner.TopLeft    , Corner.TopRight   ),
			Side.Right  => (Corner.TopRight   , Corner.BottomRight),
			Side.Bottom => (Corner.BottomRight, Corner.BottomLeft ),
			_ => throw new ArgumentException($"Invalid Side value '{side}'", nameof(side)),
		};

	public static Side GetOpposite(this Side side)
		=> side switch {
			Side.Left   => Side.Right,
			Side.Top    => Side.Bottom,
			Side.Right  => Side.Left,
			Side.Bottom => Side.Top,
			_ => throw new ArgumentException($"Invalid Side value '{side}'", nameof(side)),
		};

	public static Corner GetOpposite(this Corner corner)
		=> corner switch {
			Corner.TopLeft     => Corner.BottomRight,
			Corner.TopRight    => Corner.BottomLeft,
			Corner.BottomRight => Corner.TopLeft,
			Corner.BottomLeft  => Corner.TopRight,
			_ => throw new ArgumentException($"Invalid Corner value '{corner}'", nameof(corner)),
		};
}