const { createClient } = require('redis');
const { redisUrl } = require('./config');
const { logger } = require('../util/logger');

const client = createClient({
  url: redisUrl,
  socket: {
    reconnectStrategy: (retries) => {
      const delay = Math.min(retries * 100, 5000);
      logger.info(`Redis reconnecting attempt ${retries}, delay ${delay}ms`);
      return delay;
    },
  },
});

client.on('connect', () => logger.info('Connected to redis'));
client.on('error', (err) => logger.error(err, 'Redis error'));
client.on('ready', () => logger.info('Redis client ready'));
client.on('end', () => logger.info('Redis connection closed'));

client
  .connect()
  .catch((err) => logger.error(err, 'Failed to connect to Redis'));

// Helper functions
async function setJson(key, value, ttl = null) {
  try {
    const jsonValue = JSON.stringify(value);
    if (ttl) {
      return await client.set(key, jsonValue, { EX: ttl });
    }
    return await client.set(key, jsonValue);
  } catch (err) {
    logger.error(err, 'Redis setJson error');
    throw err;
  }
}

async function getJson(key) {
  try {
    const value = await client.get(key);
    return value ? JSON.parse(value) : null;
  } catch (err) {
    logger.error(err, 'Redis getJson error');
    throw err;
  }
}

process.on('SIGTERM', async () => {
  logger.info('SIGTERM received - closing Redis connection');
  await client.quit();
});

module.exports = {
  client,
  getJson,
  setJson,
};