auth.ts

import NextAuth from 'next-auth';
import Credentials from 'next-auth/providers/credentials';
import {authConfig} from './auth.config';
import {z} from 'zod';
import {sql} from '@vercel/postgres';
import type {User} from '@/app/lib/definitions';
import bcrypt from 'bcrypt';

async function getUser(email: string): Promise<User | undefined> {
   try {
      const user = await sql<User>`SELECT *
                                   FROM users
                                   WHERE email = ${email}`;
      return user.rows[0];
   } catch (error) {
      console.error('Failed to fetch user:', error);
      throw new Error('Failed to fetch user.');
   }
}

export const {auth, signIn, signOut} = NextAuth({
   ...authConfig,
   providers: [
      Credentials({
         async authorize(credentials) {
            const parsedCredentials = z
               .object({email: z.string().email(), password: z.string().min(6)})
               .safeParse(credentials);

            if (parsedCredentials.success) {
               const {email, password} = parsedCredentials.data;
               const user = await getUser(email);
               if (!user) return null;
               const passwordsMatch = await bcrypt.compare(password, user.password);

               if (passwordsMatch) return user;
            }
            console.log('Invalid credentials');
            return null;
         }
      })
   ]
});