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 users = await sql<User>`
      SELECT * FROM users WHERE email = ${email}
    `;

    return users.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) {
            const isValid = await bcrypt.compare(password, user.password);
            if (isValid) {
              return user;
            }
          }
        }

        return null;
      }
    })],
  },
);