import { type ProtocolMismatch } from "./types";

export interface ProtocolMismatchSnapshot {
  revision: number;
  mismatch: ProtocolMismatch | null;
}

export const INITIAL_PROTOCOL_MISMATCH_SNAPSHOT: ProtocolMismatchSnapshot = {
  revision: 0,
  mismatch: null,
};

/** Keeps listener events and bootstrap queries monotonic across async races. */
export const newestProtocolMismatchSnapshot = (
  current: ProtocolMismatchSnapshot,
  candidate: ProtocolMismatchSnapshot,
): ProtocolMismatchSnapshot =>
  candidate.revision > current.revision ? candidate : current;