import { useSyncExternalStore } from 'react';

// Counts saved control decisions in this browser session, so views that summarize accepted
// controls (the Client Info overview) reload after a decision made elsewhere.
let revision = 0;
const listeners = new Set<() => void>();

export function markRegulatoryDecisionSaved(): void {
  revision += 1;
  listeners.forEach(listener => listener());
}

function subscribe(listener: () => void) {
  listeners.add(listener);
  return () => { listeners.delete(listener); };
}

export function useRegulatoryDecisionRevision(): number {
  return useSyncExternalStore(subscribe, () => revision, () => 0);
}