auth.ts

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

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, handlers: {GET, POST}} = 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;
            },
        }),
    ],
});