const _ = require(‘lodash‘)
const path = require(‘path‘)
const fs = require(‘fs‘)
const extendRequest = require(‘request‘);
const wget = require(‘wget‘)

const icon = [{  // 自动维护图标
  aliUrl: ‘//at.alicdn.com/t/font_2562802_c09nnj8xe7i.css‘, // 暂时只支持使用阿里巴巴图标库
  dir: ‘./public/fonts‘  // 公共图标
}]
 

const postUrl = (_url,fn) => {
  extendRequest(_url, function(err, response, body) {
    if(!err && response.statusCode == 200) {
      fn(body);
    } else {
        console.log(err);
    }
  });
}
 
const downIcon = (iconUrl,dir)=> {
  postUrl(‘https:‘+iconUrl,(chunk)=>{
    let form = 0
    let to = form
    let urlList = []
    let count = 0
    while (form !== -1 && to !== -1){
      count++
      if(count > 3000) throw new Error("gen icon failed")
      form = to + 1
      form = chunk.indexOf("url(",form)
      to = chunk.indexOf(")",form+1)
      if(form !== -1 && to !== -1){
        urlList.push(chunk.substr(form+5,to - form-6))
      }
    }
    urlList = _.uniq( urlList.map(_url => _url.split("#")[0]) )
    count = urlList.length
    urlList.forEach(_url => {
      let __url = _url.split("?")[0]
      let {ext} = path.parse(__url)
      let fileName = "iconfont"+ext
      let filePath = path.join(dir,fileName)
      fs.existsSync(filePath) && fs.unlinkSync(filePath)
      if(__url[0] !== ‘/‘) return
      let download = wget.download("https:"+__url, filePath, {})
      chunk.split(_url).join("")
      download.on(‘error‘, function(err) {
        throw err
      })
    })
    urlList.forEach(_url => {
      let strs = _url.split(‘?‘)[0].split(‘.‘)
      let type = strs[strs.length - 1]
      if(_url[0] !== ‘/‘) return
      chunk = chunk.replace(_url, ‘./iconfont.‘ + type)
      chunk = chunk.replace(_url, ‘./iconfont.‘ + type)
    })

    // chunk = chunk.replace(‘./iconfont‘, "./public/fonts/iconfont");    //去掉空格
    chunk = chunk.replace(/\.\/iconfont/g, "./iconfont");    //去掉空格
    console.log(chunk)
    fs.writeFileSync(path.join(‘./public/fonts/fonts.css‘),chunk)
  })
}


// 删除文件方法
const delDir = (path)=>{
  let files = [];

  return new Promise((resolve,rejec)=>{
    console.log(fs.existsSync(path),5555)
    if(fs.existsSync(path)){
      files = fs.readdirSync(path);
      files.forEach((file, index) => {
          let curPath = path + "/" + file;
          if(fs.statSync(curPath).isDirectory()){
              delDir(curPath); //递归删除文件夹
          } else {
              fs.unlinkSync(curPath); //删除文件
          }
          // 
          if(fs.readdirSync(path).length==0){
             fs.rmdirSync(path);
            resolve(true)
          }
      });
      if(files.length==0){
        fs.rmdirSync(path);
       resolve(true)
     }
    }else{
      resolve(true);
    }
  })
}

// 删除文件夹
delDir(path.resolve(icon[0].dir)).then(r=>{
  if(!r) return;
  // 重新创建文件夹 
  fs.mkdir(‘./public/fonts/‘,function(error){
    if(error){
      console.log(error);
      return false;
    }
    console.log(‘创建目录成功‘);
      // 循环获取文件
    for(let item of icon){
      downIcon(item.aliUrl,path.resolve(item.dir));
    }
  })
});