src/middleware/auth.ts

import { Request, Response, NextFunction } from "express";
import jwt from "jsonwebtoken";
import dotenv from "dotenv";
dotenv.config();

export interface AuthRequest extends Request {
  userId?: number;
  userEmail?: string;
  file?: Express.Multer.File;
  files?: Express.Multer.File[] | { [fieldname: string]: Express.Multer.File[] };
}

export const authenticateToken = (
  req: AuthRequest,
  res: Response,
  next: NextFunction
) => {
  const authHeader = req.headers["authorization"];
  const token = authHeader && authHeader.split(" ")[1];

  if (!token) {
    return res.status(401).json({ success: false, error: "No token provided" });
  }

  const jwtSecret = process.env.JWT_SECRET || "";

  jwt.verify(token, jwtSecret, (err: any, decoded: any) => {
    if (err) {
      return res.status(403).json({ success: false, error: "Invalid or expired token" });
    }

    req.userId = decoded.userId;
    req.userEmail = decoded.email;
    next();
  });
};