text: import { LS_ACCESS_TOKEN_KEY } from './constants.js'
  
  export const isString = s => toString.call(s) === '[object String]'
  
  export function getTargetContainer(container) {
    let targetContainer
    if (container instanceof Element) {
      targetContainer = container
    } else if (isString(container)) {
      targetContainer = document.getElementById(container)
    } else {
      targetContainer = document.createElement('div')
    }
  
    return targetContainer
  }
  
  export const Query = {
    parse(search = window.location.search) {
      if (!search) return {}
      const queryString = search[0] === '?' ? search.substring(1) : search
      const query = {}
      queryString.split('&')
        .forEach(queryStr => {
          const [key, value] = queryStr.split('=')
          if (key) query[key] = value
        })
  
      return query
    },
    stringify(query, prefix = '?') {
      const queryString = Object.keys(query)
        .map(key => `${key}=${encodeURIComponent(query[key] || '')}`)
        .join('&')
      return queryString ? prefix + queryString : ''
    },
  }
  
  function ajaxFactory(method) {
    return function(apiPath, data = {}, base = 'https://api.github.com') {
      const req = new XMLHttpRequest()
      const token = localStorage.getItem(LS_ACCESS_TOKEN_KEY)
  
      let url = `${base}${apiPath}`
      let body = null
      if (method === 'GET' || method === 'DELETE') {
        url += Query.stringify(data)
      }
  
      const p = new Promise((resolve, reject) => {
        req.addEventListener('load', () => {
          const contentType = req.getResponseHeader('content-type')
          const res = req.responseText
          if (!/json/.test(contentType)) {
            resolve(res)
            return
          }
          const data = req.responseText ? JSON.parse(res) : {}
          if (data.message) {
            reject(new Error(data.message))
          } else {
            resolve(data)
          }
        })
        req.addEventListener('error', error => reject(error))
      })
      req.open(method, url, true)
  
      req.setRequestHeader('Accept', 'application/vnd.github.squirrel-girl-preview, application/vnd.github.html+json')
      if (token) {
        req.setRequestHeader('Authorization', `token ${token}`)
      }
      if (method !== 'GET' && method !== 'DELETE') {
        body = JSON.stringify(data)
        req.setRequestHeader('Content-Type', 'application/json')
      }
  
      req.send(body)
      return p
    }
  }
  
  export const http = {
    get: ajaxFactory('GET'),
    post: ajaxFactory('POST'),
    delete: ajaxFactory('DELETE'),
    put: ajaxFactory('PUT'),
  }
  