const stringUtil = require('./stringUtil')
const COS = require('cos-nodejs-sdk-v5')
const request = require('request')

const generateNonce = function() {
  return stringUtil.randomNum(10000, 99999)
}

const SecretId = 'AKIDvmW8mNvCQVt9GEnd3JNH5lHKI8oJnv46'
const SecretKey = 'd6QZhgT7alnhR3VghWAg3FF4c2JMG1c2'

const cosCDN = new COS({
  SecretId,
  SecretKey
})

const generateSign = function(method, data) {
  let str = `${method}cdn.api.qcloud.com/v2/index.php?`
  let i = 0
  for (const key in data) {
    if ({}.hasOwnProperty.call(data, key)) {
      if (i++ > 0) str += '&'
      str += `${key}=${data[key]}`
    }
  }
  return stringUtil.sha1keyBase64(str, SecretKey)
}

const cdnTools = {
  refreshDir(url) {
    const now = Math.round(new Date() / 1000)
    const data = {
      Action: 'RefreshCdnDir',
      Nonce: generateNonce(),
      SecretId: SecretId,
      Timestamp: now,
      'dirs.0': url
    }
    data.Signature = generateSign('POST', data)
    return new Promise((resolve, reject) => {
      const link = 'https://cdn.api.qcloud.com/v2/index.php'
      const options = {
        method: 'POST',
        url: link,
        headers: {
          'Cache-Control': 'no-cache',
          'Content-Type': 'application/x-www-form-urlencoded'
        },
        form: data
      }
      request(options, (err, response, body) => {
        if (err) {
          return reject(err)
        }
        resolve(JSON.parse(body))
      })
    })
  },
  refreshOneUrl(url) {
    const now = Math.round(new Date() / 1000)
    const data = {
      Action: 'RefreshCdnUrl',
      Nonce: generateNonce(),
      SecretId: SecretId,
      Timestamp: now,
      'urls.0': url
    }
    data.Signature = generateSign('POST', data)
    return new Promise((resolve, reject) => {
      const link = 'https://cdn.api.qcloud.com/v2/index.php'
      const options = {
        method: 'POST',
        url: link,
        headers: {
          'Cache-Control': 'no-cache',
          'Content-Type': 'application/x-www-form-urlencoded'
        },
        form: data
      }
      request(options, (err, response, body) => {
        if (err) {
          return reject(err)
        }
        resolve(JSON.parse(body))
      })
    })
  },
  uploadToCDN(fileName, path) {
    return new Promise(function(resolve, reject) {
      cosCDN.sliceUploadFile({
        Bucket: 'client-1256832210',
        Region: 'ap-beijing',
        Key: fileName,
        FilePath: path
      }, function(err, data) {
        if (err) {
          reject(err)
        } else {
          resolve(data)
        }
      })
    })
  },
  deleteFromCDN(files) {
    return new Promise(function(resolve, reject) {
      cosCDN.deleteMultipleObject({
        Bucket: 'client-1256832210',
        Region: 'ap-beijing',
        Objects: files
      }, function(err, data) {
        if (err) {
          reject(err)
        } else {
          resolve(data)
        }
      })
    })
  },
  listCDN(subPath) {
    return new Promise(function(resolve, reject) {
      cosCDN.getBucket({
        Bucket: 'client-1256832210',
        Region: 'ap-beijing',
        Prefix: subPath
      }, function(err, data) {
        // console.log(err || data.Contents)
        if (err) {
          reject(err)
        } else {
          resolve(data.Contents)
        }
      })
    })
  }
}

module.exports = cdnTools