import {setGlobal, useGlobal} from "reactn";
import {fetchGet, fetchPost} from "../Helpers/fetcher";

setGlobal({
  "auth/login": false,
  "auth/checked": false,
  "auth/users/me": null,
  "auth/users/all": [],
});

export default function useAuth() {
  const [isLoggedIn, setIsLoggedIn] = useGlobal("auth/login");
  const [isChecked, setIsChecked] = useGlobal("auth/checked");
  const [user, setUser] = useGlobal("auth/users/me");
  const [users, setUsers] = useGlobal("auth/users/all");

  function fetchUsers() {
    fetchGet("/user/").then(({data, error}) => {
      if (error === null) {
        setUsers(data);
      }
    });
  }

  function verify() {
    setIsChecked(false);

    fetchGet("/user/session").then(({data, error}) => {
      const validSession = error === null && data.loggedIn;

      setIsLoggedIn(validSession);

      if (validSession) {
        setUser(data.user);
        fetchUsers();
      }

      setIsChecked(true);
    })
  }

  function login(username, password) {
    setIsChecked(false);

    fetchPost("/user/login", {username, password}).then(({data, error}) => {
      setIsChecked(true);

      if (error !== null) {
        setIsLoggedIn(false);
        return;
      }

      setIsLoggedIn(true);
      setIsLoggedIn(data);
      fetchUsers();
    });
  }

  function logout() {
    setIsChecked(false);

    fetchPost("/user/logout").then(({data, error}) => {
      setIsChecked(true);

      if (error !== null) {
        setIsLoggedIn(false);
        return;
        // TODO: Show errors ¿?
      }

      setIsLoggedIn(false);
    });
  }

  function register(username, password, repeated) {
    setIsChecked(false);

    if (password !== repeated) {
      alert("Passordene er ikke like");
      return;
    }

    fetchPost("/user/register", {username, password}).then(({data, error}) => {
      if (error !== null) {
        login(username, password);
      }
    })
  }

  return {isLoggedIn, isChecked, user, users, verify, login, logout, register};
}