class UserStorage {
  loginUser(id, password, onSuccess, onError) {
    setTimeout(() => {
      if (id === "philz" && password == "swcho") {
        onSuccess(id);
      } else {
        onError(new Error("not found"));
      }
    }, 1_000);
  }

  getRoles(user, onSuccess, onError) {
    setTimeout(() => {
      if (user === "philz") {
        onSuccess({ name: "philz", role: "admin" });
      } else {
        onError(new Error("no access"));
      }
    }, 1_000);
  }
}

const userStorage = new UserStorage();
const id = prompt("enter your id");
const password = prompt("enter your password");

const login = () =>
  new Promise((resolve, reject) => {
    userStorage.loginUser(id, password, resolve, reject);
  });

const getRole = (userWithRole) =>
  new Promise((resolve, reject) => {
    userStorage.getRoles(userWithRole, resolve, reject);
  });

login() //
  .then(getRole)
  .catch(console.error)
  .then((user) => alert(`Hello ${user.name}, you have a ${user.role} role`))
  .catch(console.error);