import { createSharedStore, type SharedStore } from "@toolctrl/shared-store";

/**
 * Singleton SharedStore for the web process. Tenant-scoped caches,
 * cross-replica rate limits, and MFA challenge state migrated as part
 * of task #38 all use this instance so a single Redis connection is
 * reused across the web lifetime.
 */
let cachedStore: SharedStore | null = null;
let factory: () => SharedStore = () => createSharedStore({ namespace: "web", redisUrl: process.env.REDIS_URL });

export function getSharedStore(): SharedStore {
  if (cachedStore === null) {
    cachedStore = factory();
  }
  return cachedStore;
}

export function __setSharedStoreFactoryForTests(next: () => SharedStore): void {
  factory = next;
  cachedStore = null;
}

export function __resetSharedStoreForTests(): void {
  factory = () => createSharedStore({ namespace: "web", redisUrl: process.env.REDIS_URL });
  cachedStore = null;
}