import axios from 'axios'
let reqCount = 0 // 请求计数器


const isServer = typeof window === 'undefined'
export default ({store, app, req}, inject) => {

  const service = axios.create({
    withCredentials: true,
    // Specify baseURL by where code runs.
    baseURL: process.server ? process.env.baseUrl : '/',
    maxRedirects: 0
  })

  service.interceptors.request.use(config => {
    reqCount++
    if (process.server) {
      if (req.headers.cookie) {
        config.headers.cookie = req.headers.cookie
      }
      config.headers['User-Agent'] = req.headers['user-agent']
    }
    if (!process.server) {
      document.getElementById('loading').setAttribute('class', 'loading in')
    }
    return config
  }, error => {
    return Promise.reject(error)
  })

  service.interceptors.response.use(response => {
    const cookies = response.headers['set-cookie']
    if (cookies && cookies.length) {
      for (let i = 0; i < cookies.length; i++) {
        if (cookies[i].indexOf('JSESSIONID') > -1) {
          const sessionId = cookies[i]
          const first = sessionId.indexOf(';')
          const second = sessionId.lastIndexOf(';')
          const newSessionId = sessionId.replace(sessionId.substring(first, second), '')
          store.commit('option/SET_SESSION_ID', newSessionId)
          break
        }
      }
    }
    if (--reqCount <= 0 && !process.server) {
      document.getElementById('loading').setAttribute('class', 'loading')
    }
    return response
  }, error => {
    if (--reqCount <= 0 && !process.server) {
      document.getElementById('loading').setAttribute('class', 'loading')
    }
    return Promise.reject(error)
  })

  inject('axios', service)
}