// Simple in-memory cache. Swap for Redis later if needed.

const LIFE_TTL: Record<string, number> = {
  seconds: 30,
  minutes: 5 * 60,
  hours: 3600,
  max: 86400,
};

type CacheEntry = {
  value: unknown;
  expires: number;
};

const store = new Map<string, CacheEntry>();

type CacheTag = {
  $type: string;
  uri?: string;
  subject?: string;
  from?: string;
};

type CachePolicy = {
  life?: string;
  tags?: CacheTag[];
};

export async function cacheGet(key: string): Promise<unknown | undefined> {
  const entry = store.get(key);
  if (!entry) return undefined;
  if (Date.now() > entry.expires) {
    store.delete(key);
    return undefined;
  }
  return entry.value;
}

export async function cacheSet(
  key: string,
  value: unknown,
  policy?: CachePolicy
): Promise<void> {
  const life = policy?.life ?? "hours";
  const ttl = LIFE_TTL[life] ?? 3600;
  store.set(key, {
    value,
    expires: Date.now() + ttl * 1000,
  });
}