import http from 'http'
import request from 'request'
import { IReqOpts } from '../type/index'
import { withRetry, IRetryOptions } from './retry'
import { RequestTimgingsMeasurer } from './request-timings-measurer'

const SAFE_RETRY_CODE_SET = new Set([
  'ENOTFOUND',
  'ENETDOWN',
  'EHOSTDOWN',
  'ENETUNREACH',
  'EHOSTUNREACH',
  'ECONNREFUSED'
])

const RETRY_CODE_SET = new Set([  
  'ECONNRESET',
  'ESOCKETTIMEDOUT'
])

const RETRY_STATUS_CODE_SET = new Set([
])

function shouldRetry(e: any, result: any, operation: any) {
  // 重试的错误码
  if (e && SAFE_RETRY_CODE_SET.has(e.code)) {
    return {
        retryAble: true,
        message: e.message
    }
  }
  // 连接超时
  if (e && e.code === 'ETIMEDOUT' && e.connect === true) {
    return {
      retryAble: true,
      message: e.message
    }
  }
  // 重试的状态码
  if (result && RETRY_STATUS_CODE_SET.has(result.statusCode)) {
    return {
        retryAble: true,
        message: `${result.request.method} ${result.request.href} ${result.statusCode} ${http.STATUS_CODES[result.statusCode]}`
    }
  }
  return {
    retryAble: false,
    message: ''
  }
}

interface ITimingsMeasurerOptions {
    waitingTime?: number,
    interval?: number,
    enable?: boolean
}

interface IExtraRequestOptions {
    debug?: boolean,
    op?: string
    seqId?: string,
    attempts?: number
    timingsMeasurerOptions?: ITimingsMeasurerOptions
    retryOptions?: IRetryOptions
}

export function requestWithTimingsMeasure(opts: IReqOpts, extraOptions?: IExtraRequestOptions) {
    return new Promise((resolve, reject) => {
        const timingsMeasurerOptions: ITimingsMeasurerOptions = extraOptions.timingsMeasurerOptions || {}
        const {
          waitingTime = 1000,
          interval = 200,
          enable = !!extraOptions.debug
        } = timingsMeasurerOptions

        const timingsMeasurer = RequestTimgingsMeasurer.new({
          waitingTime,
          interval,
          enable
        })

        timingsMeasurer.on('progress', (timings: any, reason = '') => {
          const timingsLine = `s:${timings.socket || '-'}|l:${timings.lookup ||
            '-'}|c:${timings.connect || '-'}|r:${timings.ready ||
            '-'}|w:${timings.waiting || '-'}|d:${timings.download ||
            '-'}|e:${timings.end || '-'}|E:${timings.error || '-'}`
          console.warn(
            `[RequestTimgings][${extraOptions.op || ''}] spent ${Date.now() -
              timings.start}ms(${timingsLine}) [${extraOptions.seqId}][${extraOptions.attempts || 1}][${reason}]`
          )
        })

        const clientRequest = request(opts, function(err, response, body) {
            return err ? reject(err) : resolve(response)
        })

        if (clientRequest instanceof request.Request || clientRequest instanceof http.ClientRequest) {
          timingsMeasurer.measure(clientRequest)
        }
    })
}

export function extraRequest(opts: IReqOpts, extraOptions?: IExtraRequestOptions) {
    if (extraOptions && extraOptions.retryOptions) {
        return withRetry((attempts) => {
            return requestWithTimingsMeasure(opts, { ...extraOptions, attempts })
        }, { shouldRetry, ...extraOptions.retryOptions })
    }
    else {
        return requestWithTimingsMeasure(opts, { ...extraOptions, attempts: 1 })
    }
}