import { AxiosInstance } from 'axios';

export interface RateLimitedAxiosInstance extends AxiosInstance {
   getMaxRPS(): number,
   setMaxRPS(rps:number): void,
   setRateLimitOptions(options: rateLimitOptions): void,
   // enable(axios: any): void,
   // handleRequest(request:any):any,
   // handleResponse(response: any): any,
   // push(requestHandler:any):any,
   // shiftInitial():any,
   // shift():any
}

type rateLimitOptions = { maxRequests?: number, perMilliseconds?: number, maxRPS?:number };

 /**
  * Apply rate limit to axios instance.
  *
  * @example
  *   import axios from 'axios';
  *   import rateLimit from 'axios-rate-limit';
  *
  *   // sets max 2 requests per 1 second, other will be delayed
  *   // note maxRPS is a shorthand for perMilliseconds: 1000, and it takes precedence
  *   // if specified both with maxRequests and perMilliseconds
  *   const http = rateLimit(axios.create(), { maxRequests: 2, perMilliseconds: 1000, maxRPS: 2 })
 *    http.getMaxRPS() // 2
  *   http.get('https://example.com/api/v1/users.json?page=1') // will perform immediately
  *   http.get('https://example.com/api/v1/users.json?page=2') // will perform immediately
  *   http.get('https://example.com/api/v1/users.json?page=3') // will perform after 1 second from the first one
  *   http.setMaxRPS(3)
  *   http.getMaxRPS() // 3
  *   http.setRateLimitOptions({ maxRequests: 6, perMilliseconds: 150 }) // same options as constructor
  *
  * @param {Object} axios axios instance
  * @param {Object} options options for rate limit, available for live update
  * @param {Number} options.maxRequests max requests to perform concurrently in given amount of time.
  * @param {Number} options.perMilliseconds amount of time to limit concurrent requests.
  * @returns {Object} axios instance with interceptors added
  */
export default function axiosRateLimit(
    axiosInstance: AxiosInstance,
    options: rateLimitOptions
): RateLimitedAxiosInstance;