import { resolve } from "node:path";

export function cachedWorkspaceMatches(
  cached: unknown,
  requested: string,
): boolean {
  // Lexical only. realpath/stat would send the health probe back onto FUSE.
  return typeof cached === "string" && resolve(cached) === resolve(requested);
}

/** Health probes use cached local state only: never touch the mounted tree. */
export function isDaemonHealthy(
  state: {
    startedAt: number;
    lastUpdatedAt: number;
    lastReconcile: { finishedAt: number } | null;
    mountWorker?: { state: string; lastProgressAt: number | null };
  } | null,
  pidAlive: boolean,
  now = Date.now(),
): boolean {
  const fresh = (timestamp: number | null | undefined, maxAge: number) =>
    typeof timestamp === "number" &&
    Number.isFinite(timestamp) &&
    now - timestamp >= 0 &&
    now - timestamp < maxAge;
  return Boolean(
    pidAlive &&
      state &&
      fresh(state.lastUpdatedAt, 15_000) &&
      state.mountWorker?.state === "ready" &&
      fresh(state.mountWorker.lastProgressAt, 45_000) &&
      (state.lastReconcile
        ? fresh(state.lastReconcile.finishedAt, 60_000)
        : fresh(state.startedAt, 10_000)),
  );
}