/**
 * In-memory cache/store — replaces Redis for development.
 * Swap to real Redis when scaling (ioredis).
 */

const store = new Map<string, { value: string; expiresAt?: number }>();

export const cache = {
  async get(key: string): Promise<string | null> {
    const entry = store.get(key);
    if (!entry) return null;
    if (entry.expiresAt && Date.now() > entry.expiresAt) {
      store.delete(key);
      return null;
    }
    return entry.value;
  },

  async set(key: string, value: string, ttlSeconds?: number): Promise<void> {
    store.set(key, {
      value,
      expiresAt: ttlSeconds ? Date.now() + ttlSeconds * 1000 : undefined,
    });
  },

  async del(key: string): Promise<void> {
    store.delete(key);
  },

  async flush(): Promise<void> {
    store.clear();
  },
};