import type { ExpressAuthConfig } from "@auth/express";
import Credentials from "@auth/express/providers/credentials";
import bcrypt from "bcryptjs";
import type { RowDataPacket } from "mysql2";
import pool from "../db/pool.js";
import type { Ruolo, Utente } from "../types/index.js";

export const authConfig: ExpressAuthConfig = {
  trustHost: true,
  secret: process.env.AUTH_SECRET,
  session: { strategy: "jwt" },
  pages: { signIn: "/login" },
  providers: [
    Credentials({
      credentials: {
        email: { label: "Email", type: "email" },
        password: { label: "Password", type: "password" },
      },
      async authorize(credentials) {
        const email = credentials?.email?.toString().trim().toLowerCase();
        const password = credentials?.password?.toString();

        if (!email || !password) return null;

        const [rows] = await pool.execute<RowDataPacket[]>(
          "SELECT utente_id, nome, cognome, email, password_hash, ruolo FROM utenti WHERE email = ?",
          [email]
        );

        const user = rows[0] as Utente | undefined;
        if (!user) return null;

        const valid = await bcrypt.compare(password, user.password_hash);
        if (!valid) return null;

        return {
          id: String(user.utente_id),
          email: user.email,
          name: `${user.nome} ${user.cognome}`,
          ruolo: user.ruolo as Ruolo,
        };
      },
    }),
  ],
  callbacks: {
    async jwt({ token, user }) {
      if (user) {
        token.id = user.id;
        token.ruolo = user.ruolo;
      }
      return token;
    },
    async session({ session, token }) {
      if (session.user) {
        session.user.id = token.id as string;
        session.user.ruolo = token.ruolo as Ruolo;
      }
      return session;
    },
  },
};