module.exports = {
  publicPath: ‘https://api.weixin.qq.com/cgi-bin/‘,  // 公共的接口地址
  appId: ‘‘, // 你公眾號的id
  appSecret: ‘‘, // 你公眾號的appSecret
}

const fs = require(‘fs‘)
const https = require(‘https‘)
const config 
 
= require(‘./config‘)

const write = (file, ca) => {
  // 獲取token並寫入
  switch (file) {
    case ‘token‘:
      httpsGet(‘access_token‘, `${config.publicPath}token?grant_type=client_credential&appid=${config.appId}&secret=${config.appSecret}`, ca)
      break;
    case ‘ticket‘:
      read(
 
‘token‘, res => {
        httpsGet(‘jsapi_ticket‘, `${config.publicPath}ticket/getticket?access_token=${res.access_token.access_token}&type=jsapi`, ca)
      })
      break;
  }
}

const httpsGet = (filesName, getUrl, ca) => {
  // 請求token和ticket
  https.get(
    getUrl,
    function
 
 (data) {

      var str = "";
      data.on("data", function (chunk) {
        str += chunk; //監聽數據響應，拼接數據片段
      })
      data.on("end", function () {

        let times = Date.parse(new Date())
        let result = `{"${filesName}":${str.toString()},"times":${times + 7200 * 1000}}`


        // 判斷 jsapi_ticket 是否獲取成功, 成功後寫入，不成功側打印 jsapi_ticket 獲取失敗
        if (filesName === ‘jsapi_ticket‘) {
          let resultObj = JSON.parse(result)
          if (resultObj.jsapi_ticket.errmsg !== ‘ok‘) {
            // 沒有獲取成功
            console.log(`jsapi_ticket 獲取失敗，寫入失敗, 原因：token錯誤，或其他錯誤`)

            return
          }
        }

        // console.log(result)
        const writeStream = fs.createWriteStream(`./config/json/${filesName}.json`);
        //寫入數據，指定數據的編碼格式
        writeStream.write(result, ‘utf8‘);
        //標記寫入完成（寫入完成後會廣播一個finish事件）
        writeStream.end();

        //接收finish事件
        writeStream.on(‘finish‘, () => {
          console.log(‘寫入完成‘);
          ca(JSON.parse(result))
        });
        //寫入失敗
        writeStream.on(‘error‘, () => {
          console.log(‘寫入失敗‘);
        })
      })
    })
}

const read = (file, ca) => {
  //讀取文件(文件流的方式讀取文件)（文件比較多的時候分開來讀，這樣不會卡死）
  // return new Promise((resolve, reject) => {

  // })

  let files = [‘access_token‘, ‘jsapi_ticket‘]
  let filesName = files[0]
  switch (file) {
    case ‘token‘:
      filesName = files[0]
      break;
    case ‘ticket‘:
      filesName = files[1]
      break;
  }
  let readStream = fs.createReadStream(`./config/json/${filesName}.json`);

  let str = ‘‘
  //接收讀取到的數據
  readStream.on(‘data‘, (chunk) => {
    str += chunk;
  });

  //讀取完成後觸發
  readStream.on(‘end‘, (chunk) => {
    let res = JSON.parse(str)
    ca(res)
  });
  //讀取失敗
  readStream.on(‘error‘, (error) => {
    console.log(error);
  });
}

// 過期自動寫入
(() => {
  read(‘token‘, res => {

    let times = Date.parse(new Date())

    if (times < res.times) {
      console.log("沒過期")
    }
    if (times > res.times) {
      console.log("過期了")
      // 過期了
      // 寫入token
      write(‘token‘, token_res => {
        console.log(`寫入token成功 ---${token_res}`);

        // 寫入token完成後寫入ticket
        write(‘ticket‘, res => {
          console.log(`寫入ticket成功 --- ${res}`)
        })
      })
    }
  })
})()


module.exports = {
  read
}

node獲取token和ticket並存儲