/**
 * 基于 Promise 重试工具函数
 * @param fn 重试包装函数
 * @param retriesLeft 重试次数，默认3次
 * @param interval 重试间隔时间， 默认间隔是1s
 *
 * @example
 * const test = () => new Promise((resolve, reject) =>
 *   Math.random() < 0.2 ? resolve("Success") : reject(new Error("Error")));
 *
 * retry(test, 5, 100, true) // retry 5 times with exponential backoff (100ms, 200ms, 400ms, 800ms, 1.6s, err)
 * retry(test, 5, 10) // retry infinite times with 10 inbetween (10ms, 10ms, 10ms, ...)
 *
 * fn(arguments) 参数方式
 * retry(() => fn(arg1, arg2))
 */
export async function retry<T>(
  fn: () => Promise<T>,
  retriesLeft = 3,
  interval = 1000,
  exponential = false,
): Promise<T> {
  try {
    return await fn();
  } catch (error) {
    if (retriesLeft) {
      await new Promise(r => setTimeout(r, interval));
      return retry(fn, retriesLeft - 1, exponential ? interval * 2 : interval, exponential);
    }
    throw new Error(`Max retries reached for function ${fn.name}`);
  }
}

export default retry;