const Redis = require('ioredis');

const host = process.env.VALKEY_HOST || 'localhost';
const port = parseInt(process.env.VALKEY_PORT) || 6379;
const password = process.env.VALKEY_PASSWORD || undefined;
const db = parseInt(process.env.VALKEY_DB) || 0;
const ttl = parseInt(process.env.VALKEY_TTL) || 30;

let redis = null;

try {
  redis = new Redis({
    host,
    port,
    password,
    db,
    lazyConnect: true,
    maxRetriesPerRequest: 1
  });

  redis.on('error', (err) => {
    // Fail silently after one retry, we just won't cache
    console.warn('[Cache] Valkey connection failed, caching disabled:', err.message);
  });
} catch (err) {
  console.warn('[Cache] Valkey init failed:', err.message);
}

const cache = {
  async get(key) {
    if (!redis) return null;
    try {
      const data = await redis.get(key);
      return data ? JSON.parse(data) : null;
    } catch (e) {
      return null;
    }
  },

  async set(key, value, customTtl = ttl) {
    if (!redis) return;
    try {
      await redis.set(key, JSON.stringify(value), 'EX', customTtl);
    } catch (e) {
      // ignore
    }
  },

  async del(key) {
    if (!redis) return;
    try {
      await redis.del(key);
    } catch (e) {
      // ignore
    }
  }
};

module.exports = cache;