auth.ts

import NextAuth from 'next-auth';
import { authConfig } from './auth.config';
import Credentials from 'next-auth/providers/credentials';
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 user")
        return null;
    },
    }),
],
});