import React, { createContext, useContext, useEffect, useState } from "react";

import { supabase } from "utils/supabaseClient";

// create a context for authentication
const AuthContext = createContext();

export const AuthProvider = ({ children }) => {
  const [user, setUser] = useState();
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    // Check active sessions and sets the user
    const session = supabase.auth.session();

    setUser(session?.user ?? null);
    setLoading(false);

    // Listen for changes on auth state (logged in, signed out, etc.)
    const { data: listener } = supabase.auth.onAuthStateChange(
      async (event, session) => {
        if ((event === "SIGNED_OUT") | (event === "SIGNED_IN")) {
          fetch("/api/auth", {
            method: "POST",
            headers: new Headers({ "Content-Type": "application/json" }),
            credentials: "same-origin",
            body: JSON.stringify({ event, session }),
          }).then((res) => res.json());
        }
        if (event === "USER_UPDATED") {
        }
        setUser(session?.user ?? null);
        setLoading(false);
      }
    );

    return () => {
      listener?.unsubscribe();
    };
  }, []);

  // Will be passed down to Signup, Login and Dashboard components
  const value = {
    signUp: (data) => supabase.auth.signUp(data),
    signIn: (data) => supabase.auth.signIn(data),
    signOut: () => supabase.auth.signOut(),
    resetPassword: (data) => supabase.auth.api.resetPasswordForEmail(data),
    user,
  };

  return (
    <AuthContext.Provider value={value}>
      {!loading && children}
    </AuthContext.Provider>
  );
};

// export the useAuth hook
export const useAuth = () => {
  return useContext(AuthContext);
};