import Foundation

public struct RouteSetDiff: Equatable, Sendable {
    public let additions: Set<MeshAddress>
    public let removals: Set<MeshAddress>
}

public enum HelperRouteSet {
    public static func validate(_ desired: Set<MeshAddress>, local: MeshAddress, maximum: Int = 31) throws {
        guard desired.count <= maximum, !desired.contains(local) else { throw UMNError.invalidFrame }
    }
    public static func diff(current: Set<MeshAddress>, desired: Set<MeshAddress>) -> RouteSetDiff {
        .init(additions: desired.subtracting(current), removals: current.subtracting(desired))
    }
}