import axios from 'axios'
import { Loading, Message, MessageBox, Notification } from 'element-ui'
import store from '@/store'
import { getToken } from '@/utils/auth'
import errorCode from '@/utils/errorCode'
import { blobValidate, tansParams } from '@/utils/bonus'
import cache from '@/plugins/cache'
import { saveAs } from 'file-saver'
import { decryptCBC, encryptCBC } from '@/utils/aescbc'
import { hashWithSM3AndSalt } from '@/utils/sm' // 导入SM3哈希函数

let downloadLoadingInstance
export let isRelogin = { show: false }

axios.defaults.headers['Content-Type'] = 'application/json;charset=utf-8'

// 创建axios实例
const service = axios.create({
  baseURL: process.env.VUE_APP_BASE_API,
  timeout: 10000
})

// 请求拦截器
service.interceptors.request.use(
  (config) => {
    const isToken = (config.headers || {}).isToken === false
    const isRepeatSubmit = (config.headers || {}).repeatSubmit === false

    // 如果需要token且存在token，则设置Authorization头
    if (getToken() && !isToken) {
      config.headers['Authorization'] = 'Bearer ' + getToken()
    }

    // 处理GET请求参数并加密
    if (config.params) {
      let param = tansParams(config.params)
      if (param) {
        param = param.slice(0, -1)
        param = encryptCBC(param)
        config.headers['Params-Hash'] = hashWithSM3AndSalt(param)
      }
      config.url = `${config.url}?${param}`
      config.params = {}
    }

    // 防止重复提交
    if (!isRepeatSubmit && (config.method === 'post' || config.method === 'put')) {
      const requestObj = {
        url: config.url,
        data: typeof config.data === 'object' ? JSON.stringify(config.data) : config.data,
        time: new Date().getTime()
      }
      const requestSize = Object.keys(JSON.stringify(requestObj)).length
      const limitSize = 5 * 1024 * 1024 // 限制请求数据大小为5M

      if (requestSize >= limitSize) {
        console.warn(`[${config.url}]: 请求数据大小超出允许的5M限制，无法进行防重复提交验证。`)
        return config
      }

      const sessionObj = cache.session.getJSON('sessionObj')
      if (!sessionObj) {
        cache.session.setJSON('sessionObj', requestObj)
      } else {
        const { url, data, time } = sessionObj
        const interval = 1000 // 间隔时间(ms)，小于此时间视为重复提交

        if (data === requestObj.data && requestObj.time - time < interval && url === requestObj.url) {
          const message = '数据正在处理，请勿重复提交'
          console.warn(`[${url}]: ${message}`)
          return Promise.reject(new Error(message))
        } else {
          cache.session.setJSON('sessionObj', requestObj)
        }
      }
    }

    // 如果Content-Type为application/json且数据为对象，则加密数据
    if (config.headers['Content-Type'] === 'application/json;charset=utf-8' && typeof config.data === 'object') {
      config.data = encryptCBC(JSON.stringify(config.data))
      config.headers['Content-Type'] = 'application/json'
      console.log(config.data)
      config.headers['Params-Hash'] = hashWithSM3AndSalt(config.data) // 添加数据哈希到请求头
    }

    // 对下载请求进行数据参数拦截加密
    if (config.headers['Content-Type'] === 'application/x-www-form-urlencoded') {
      if (typeof config.data === 'object') {
        let formData = tansParams(config.data)
        if (formData) {
          formData = formData.slice(0, -1)
          config.data = encryptCBC(formData)
          console.log(config.data)
          config.headers['Params-Hash'] = hashWithSM3AndSalt(config.data) // 添加参数哈希到请求头
        }
      } else {
        config.data = encryptCBC('formData=' + JSON.stringify(config.data))
        config.headers['Params-Hash'] = hashWithSM3AndSalt(config.data) // 添加参数哈希到请求头
      }
    }

    // 如果Content-Type为空，则设置为application/json
    if (!config.headers['Content-Type']) {
      config.headers['Content-Type'] = 'application/json'
      console.warn('请求类型为空')
    }

    return config
  },
  (error) => {
    console.log(error)
    return Promise.reject(error)
  }
)

// 响应拦截器
service.interceptors.response.use(
  (res) => {
    // 自动解密响应数据
    if (res.data.decrypt) {
      res.data = JSON.parse(decryptCBC(res.data.data))
    } else if (typeof res.data.code === 'undefined') {
      res.data = res.data.data
    }

    // 获取状态码
    const code = res.data.code || 200
    const msg = errorCode[code] || res.data.msg || errorCode['default']

    // 处理二进制数据直接返回
    if (res.request.responseType === 'blob' || res.request.responseType === 'arraybuffer') {
      return res.data
    }

    if (code === 401) {
      if (!isRelogin.show) {
        isRelogin.show = true
        MessageBox.confirm('登录状态已过期，您可以继续留在该页面，或者重新登录', '系统提示', {
          confirmButtonText: '重新登录',
          cancelButtonText: '取消',
          type: 'warning'
        }).then(() => {
          isRelogin.show = false
          store.dispatch('LogOut').then(() => {
            location.href = '/index'
          })
        }).catch(() => {
          isRelogin.show = false
        })
      }
      return Promise.reject('无效的会话，或者会话已过期，请重新登录。')
    } else if (code === 500) {
      Message({ message: msg, type: 'error' })
      return Promise.reject(new Error(msg))
    } else if (code === 601) {
      Message({ message: msg, type: 'warning' })
      return Promise.reject('error')
    } else if (code !== 200) {
      Notification.error({ title: msg })
      return Promise.reject('error')
    } else {
      return res.data
    }
  },
  (error) => {
    console.log('err' + error)
    let { message } = error

    if (message === 'Network Error') {
      message = '后端接口连接异常'
    } else if (message.includes('timeout')) {
      message = '系统接口请求超时'
    } else if (message.includes('Request failed with status code')) {
      message = `系统接口${message.substr(message.length - 3)}异常`
    }

    Message({ message, type: 'error', duration: 5 * 1000 })
    return Promise.reject(error)
  }
)

// 通用下载方法
export function download(url, params, filename, config) {
  downloadLoadingInstance = Loading.service({
    text: '正在下载数据，请稍候',
    spinner: 'el-icon-loading',
    background: 'rgba(0, 0, 0, 0.7)'
  })
  console.log(params)
  return service.post(url, params, {
    transformRequest: [(params) => params],
    headers: {
      'Content-Type': 'application/x-www-form-urlencoded',
      'Params-Hash': hashWithSM3AndSalt(params)
    },
    responseType: 'blob',
    ...config
  }).then(async(data) => {
    const isBlob = blobValidate(data)
    if (isBlob) {
      const blob = new Blob([data])
      saveAs(blob, filename)
    } else {
      const resText = await data.text()
      const rspObj = JSON.parse(resText)
      const errMsg = errorCode[rspObj.code] || rspObj.msg || errorCode['default']
      Message.error(errMsg)
    }
    downloadLoadingInstance.close()
  }).catch((r) => {
    console.error(r)
    Message.error('下载文件出现错误，请联系管理员！')
    downloadLoadingInstance.close()
  })
}

export default service