function login(id, pw) {
  const crawler = async() => {
      try{
          const browser = await puppeteer.launch({headless: false, args:['--window-size=1920,1080']});
          // for observing the process of login, headless -> false
          const page = await browser.newPage();
          await page.setViewport({
              width:1920,
              height:1080
          })
          await page.goto('https://e-campus.khu.ac.kr/xn-sso/login.php?auto_login=&sso_only=&cvs_lgn=&return_url=https%3A%2F%2Fe-campus.khu.ac.kr%2Fxn-sso%2Fgw-cb.php%3Ffrom%3D%26login_type%3Dstandalone%26return_url%3Dhttps%253A%252F%252Fe-campus.khu.ac.kr%252Flogin%252Fcallback');
          await page.evaluate(() => {
              document.querySelector("#login_user_id").value = id
              document.querySelector("#login_user_password").value = pw
              document.querySelector('#form1 > div > div.login_btn > a > span').click();
          })

      }catch(err){
          console.log(err)
      }
      if(page.url() === 'https://e-campus.khu.ac.kr/xn-sso/login.php?auto_login=&sso_only=&cvs_lgn=&return_url=https%3A%2F%2Fe-campus.khu.ac.kr%2Fxn-sso%2Fgw-cb.php%3Ffrom%3D%26login_type%3Dstandalone%26return_url%3Dhttps%253A%252F%252Fe-campus.khu.ac.kr%252Flogin%252Fcallback'){
        return "the account id or password you entered is incorrect";}
      else {
        return `I got data { id:"${id}"  pw:"${pw}" }`;
      }
  }
  crawler();
}

export { login };