const puppeteer  = require("puppeteer");
//use puppeteer

function setTimeoutPromise(ms) {
    return new Promise((resolve, reject) => {
      setTimeout(() => resolve(), ms);
    });
}

async function loglogin(id, pw) {
    try{
        //for visibility, headless: false  
        const browser = await puppeteer.launch({headless: false, args:['--window-size=1920,1080']});
        
        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.type("#login_user_id", id);
        await page.type("#login_user_password", pw);
        
        //press the login button on E_Campus homepage
        await page.click('#form1 > div > div.login_btn > a > span');
        await page.waitForTimeout(500);
        await setTimeoutPromise(1000);
        
        //When login is failed, return [id, pw, message] -> ["", "", "Incorrect~"]
        if(page.url() === 'https://e-campus.khu.ac.kr/xn-sso/gw-cb.php?from=&login_type=standalone&return_url=https%3A%2F%2Fe-campus.khu.ac.kr%2Flogin%2Fcallback'){
            return ["", "", "Incorrect user ID or password."];   
        }
        else {
            return [id, pw, `I got data { id:"${id}"  pw:"${pw}" }`]; 
         }
    }catch(err){
        console.log(err)
    }
}
async function login(id, pw) {
    await setTimeoutPromise(1000);
  try {
    // value has the list ["","","Incorrect~"] or [id, pw, "I got data~"]
    const value = await loglogin(id, pw);
    console.log(value[2]);
  } catch (e) {
    console.error(e);
  }
}

export { login };