import NextAuth, { NextAuthConfig } from 'next-auth';
import GoogleProvider from 'next-auth/providers/google';
import { Session } from 'next-auth';

const authConfig: NextAuthConfig = {
   callbacks: {
      // method verifies if the user is logged in or not
      // -> is called by Next-Auth when the midleware calls the `auth` method (exported below)
      authorized({ auth, request: { nextUrl } }) {
         const isLoggedIn = !!auth?.user;
         return (isLoggedIn);
      },
      // method is called when the user is not logged in
      // this is a hack which takes user ID and assigns it temporaty to the token, which is then used to extend Session.user
      // see: https://stackoverflow.com/questions/70409219/get-user-id-from-session-in-next-auth-client
      jwt({ token, account, user }) {
         if (account) {
           token.accessToken = account.access_token
           token.id = user?.id
         }
         return token
      },
      // method is called after the JWT token is created
      // this is a hack which takes user ID temporaty assigned to the token and assigns it to the Session.user
      // see: https://stackoverflow.com/questions/70409219/get-user-id-from-session-in-next-auth-client
      async session({ session, token }:{ session:Session, token:any }) {
         if(session.user && token) {
            session.user.id = token.id;
         }
         return session;
       },
   },
   providers: [
      GoogleProvider({
         clientId: process.env.GOOGLE_ID,
         clientSecret: process.env.GOOGLE_SECRET,
      }),
   ],
   secret: process.env.AUTH_SECRET,
   session: {
      // Use JSON Web Tokens for session instead of database sessions.
      // This option can be used with or without a database for users/accounts.
      // Note: `jwt` is automatically set to `true` if no database is specified.
      strategy: 'jwt'
   },
};

export const { auth, handlers: { GET, POST } } = NextAuth(authConfig);