import logger from '@/logger'
import redis from './redis.lock'
import RedisLock, { type Lock } from 'redlock'

const redisLock = new RedisLock(
  // You should have one client for each independent redis node or cluster.
  [redis],
  {
    // The expected clock drift; for more details see:
    // http://redis.io/topics/distlock
    // 容忍的漂移因子
    driftFactor: 0.01, // multiplied by lock ttl to determine drift time

    // The max number of times Redlock will attempt to lock a resource before erroring.
    // 重试次数
    retryCount: 10,

    // the time in ms between attempts
    // 重试间隔
    retryDelay: 200, // time in ms

    // the max time in ms randomly added to retries to improve performance under high contention
    // see https://www.awsarchitectureblog.com/2015/03/backoff.html
    // 随机延迟
    retryJitter: 200, // time in ms

    // The minimum remaining time on a lock before an extension is automatically attempted with the `using` API.
    automaticExtensionThreshold: 500, // time in ms
  }
)

const lockKey = 'locks:cloud_log_list'
const delay = 5 * 60 *1000 // ms
let lock: Lock | undefined  = undefined

export async function listLock() {
  lock = await redisLock.acquire([...lockKey], delay);
  logger.info('cloud log list lock acquired!');
}

export async function extendLock() {
  lock = await lock?.extend(delay)
  logger.info('cloud log list lock extend!');
}

export async function listUnlock() {
  await lock?.release();
  logger.info('cloud log list lock released!');
  lock = undefined
}

// 检查资源是否已锁定
export function checkLockStatus() {
  if (lock === undefined) {
    logger.info('cloud log resource is not locked.');
    return false; // 未被锁定
  } else {
    logger.info('cloud log resource is already locked.');
    return true; // 已被锁定
  }
}