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.sql<User>`
            SELECT * FROM users WHERE email = ${email}
        `;
        return user.rows[0];
    } catch (error) {
        console.error('Failed to get user: ', error);
        throw new Error('Failed to get 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;
        },
    })],
});