/* ASYNC:  To get data frm the servers in the background 
live a goolge typing

*/

/*otherFucnt();

console.log("start");

function otherFucnt() {
  setTimeout(() => {
    console.log("async");
  }, 2000);
}
console.log("end");
*/

//Callbacl and Callback HEll  . onSuccess, onFailure
/*
console.log("start");

function login(email, password, callback) {
  setTimeout(() => {
    callback({ email: email });
  }, 5000);
}

function loginVidoes(email, callback) {
  setTimeout(() => {
    callback(["video1", "video2"]);
  }, 5000);
}

const user = login("m90khan", "a123312", (user) => {
  console.log(user.email);
  loginVidoes(user.email, (videos) => {
    console.log(videos);
  });
}); */

// will give undefined because the function did not return anything by
// the time we console the user

/* Promises
when we fetching data from an api , we migt not get the data instead maybe get error
Promises simply the callback

promise is an object which either give a result or a faailure 


*/

// const promise = new Promise((resolve, reject) => {
//   setTimeout(() => {
//     // resolve({ user: "khan" });
//     reject(new Error("user not found"));
//   }, 2000);
// });

// function loginVidoes(email, callback) {
//   setTimeout(() => {
//     callback(["video1", "video2"]);
//   }, 5000);
// }

// promise
//   .then((user) => {
//     console.log(user);
//   })
//   .catch((err) => {
//     console.log(err);
//   });

// Refatcor into promise
function login(email, password) {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      resolve({ email: email });
    }, 5000);
  });
}

function loginVidoes(email) {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      resolve(["video1", "video2"]);
    }, 5000);
  });
}

//   const user = login("m90khan", "a123312", (user) => {
//     console.log(user.email);
//     loginVidoes(user.email, (videos) => {
//       console.log(videos);
//     });
//   });

login("m90khan", 12345)
  .then((user) => {
    loginVidoes(user.email);
  })
  .then((video) => console.log(video));

Promise.all([login, loginVidoes]).then((result) => console.log(result));

//ASYNC AWAIT

async function displayUser() {
  try {
    const loginuser = await login("khan");
    const videos = await loginVidoes(login.email);
  } catch (err) {
    console.log(err);
  }
}

displayUser();