auth.ts

import NextAuth from 'next-auth';
import { PrismaAdapter } from '@auth/prisma-adapter';
import { UserRole } from '@prisma/client';
import { db } from './lib/db';
import authConfig from './auth.config';
import { getUserById } from './data/user';
import { getTwoFactorConfirmationByUserId } from './data/two-factor-confirmation';
import { getAccountByUserId } from './data/account';

export const {
  handlers: { GET, POST },
  auth,
  signIn,
  signOut,
} = NextAuth({
  pages: {
    signIn: '/auth/login',
    error: '/auth/error',
  },

  events: {
    async linkAccount({ user }) {
      await db.user.update({
        where: {
          id: user.id,
        },
        data: {
          emailVerified: new Date(),
        },
      });
    },
  },
  callbacks: {
    async signIn({ user, account }) {
      // Allow OAuth without email verification
      if (account?.provider !== 'credentials') return true;

      if (!user.id) {
        return false;
      }

      const existingUser = await getUserById(user.id);

      // Prevent sign in without email verification
      if (!existingUser?.emailVerified) return false;

      if (existingUser.isTwoFactorEnabled) {
        const twoFactorConfirmation = await getTwoFactorConfirmationByUserId(
          existingUser.id,
        );

        if (!twoFactorConfirmation) return false;

        // Delete two factor confirmation for next sign in
        await db.twoFactorConfirmation.delete({
          where: {
            id: twoFactorConfirmation.id,
          },
        });
      }

      return true;
    },
    async session({ session, token }) {
      if (token.sub && session.user) {
        session.user.id = token.sub;
      }

      if (token.role && session.user) {
        session.user.role = token.role as UserRole;
      }

      if (session.user) {
        session.user.isTwoFactorEnabled = token.isTwoFactorEnabled as boolean;
      }

      if (session.user) {
        session.user.name = token.name;
        session.user.email = token.email as string;
        session.user.isOAuth = token.isOAuth as boolean;
      }

      // return { ...session, user: { ...session.user, ...user } };

      return session;
    },
    async jwt({ token }) {
      if (!token.sub) return token;

      const existingUser = await getUserById(token.sub);

      if (!existingUser) return token;

      const existingAccount = await getAccountByUserId(existingUser.id);

      token.isOAuth = !!existingAccount;
      token.name = existingUser.name;
      token.email = existingUser.email;
      token.role = existingUser.role;
      token.isTwoFactorEnabled = existingUser.isTwoFactorEnabled;

      return token;
    },
  },
  adapter: PrismaAdapter(db),
  trustHost: true,
  session: {
    strategy: 'jwt',
  },
  ...authConfig,
});