import Redis from "ioredis";

let redis: Redis | null = null;

export function getRedis(): Redis | null {
  const url = process.env.REDIS_URL;
  if (!url) return null;
  if (!redis) {
    redis = new Redis(url, { maxRetriesPerRequest: 3, lazyConnect: true });
  }
  return redis;
}

export async function cacheGet<T>(key: string): Promise<T | null> {
  const r = getRedis();
  if (!r) return null;
  try {
    const val = await r.get(key);
    return val ? (JSON.parse(val) as T) : null;
  } catch {
    return null;
  }
}

export async function cacheSet(key: string, value: unknown, ttlSec = 3600) {
  const r = getRedis();
  if (!r) return;
  try {
    await r.setex(key, ttlSec, JSON.stringify(value));
  } catch {
    /* ignore */
  }
}