import { inflate } from 'zlib'
import { toMD5 } from '../utils'
import { httpFetch } from '../../request'

// https://github.com/lyswhut/lx-music-desktop/issues/296#issuecomment-683285784
const enc_key = Buffer.from([0x40, 0x47, 0x61, 0x77, 0x5e, 0x32, 0x74, 0x47, 0x51, 0x36, 0x31, 0x2d, 0xce, 0xd2, 0x6e, 0x69], 'binary')
export const decodeLyric = str => new Promise((resolve, reject) => {
  if (!str.length) return
  const buf_str = Buffer.from(str, 'base64').slice(4)
  for (let i = 0, len = buf_str.length; i < len; i++) {
    buf_str[i] = buf_str[i] ^ enc_key[i % 16]
  }
  inflate(buf_str, (err, result) => {
    if (err) return reject(err)
    resolve(result.toString())
  })
})

// s.content[0].lyricContent.forEach(([str]) => {
//   console.log(str)
// })


const signatureKey = { app: 'OIlwieks28dk2k092lksi2UIkp', web: 'NVPh5oo715z5DIWAeQlhMDsWXXQV4hwt' }
/**
 * 签名
 * @param {*} params
 * @param {*} apiver
 */
export const signatureParams = (params, apiver = 9) => {
  let key = signatureKey.app
  if (apiver === 5) key = signatureKey.web

  if (typeof params === 'object') {
    if (!Array.isArray(params)) throw new Error('params error.')
    params = params.sort()
  } else if (typeof params === 'string') {
    params = params.split('&').sort()
  } else throw new Error('params error.')

  return toMD5(`${key}${params.join('')}${key}`)
}

/**
 * 创建一个适用于KG的Http请求
 * @param {*} url
 * @param {*} options
 * @param {*} retryNum
 */
export const createHttpFetch = async(url, options, retryNum = 0) => {
  if (retryNum > 2) throw new Error('try max num')
  let result
  try {
    result = await httpFetch(url, options).promise
  } catch (err) {
    console.log(err)
    return createHttpFetch(url, options, ++retryNum)
  }
  // console.log(result.statusCode, result.body)
  if (result.statusCode !== 200 ||
    (
      (result.body.error_code !== undefined
        ? result.body.error_code
        : result.body.errcode !== undefined
          ? result.body.errcode
          : result.body.err_code
      ) !== 0)
  ) return createHttpFetch(url, options, ++retryNum)
  if (result.body.data) return result.body.data
  if (Array.isArray(result.body.info)) return result.body
  return result.body.info
}