namespace Sunless.Architecture;

// The host's answers, asked once instead of per catalogue read - ArchHost.Load() runs a discovery scan, and folder
// resolution sits on the paint path. Held only until the assembly changes, the way ArchStorage holds its serialiser.
public static class ArchHostSettled {
	static ArchHost held;
	static string heldFor;

	// A stock answer is never remembered: discovery can come up empty before the game's assembly has enrolled, and
	// caching that would strand every catalogue in the library's own folders until the next reload.
	public static ArchHost Now {
		get {
			var assembly = typeof( ArchHostSettled ).Assembly.FullName;

			if ( heldFor != assembly ) {
				heldFor = assembly;
				held = null;
			}

			if ( held is not null ) {
				return held;
			}

			var asked = ArchHost.Load();

			return asked.IsStock ? asked : held = asked;
		}
	}
}