import { Request, Response, NextFunction } from 'express';
import jwt from 'jsonwebtoken';

export interface JwtPayload {
  userId: string;
  email: string;
  role: string;
}

declare global {
  namespace Express {
    interface Request {
      user?: JwtPayload;
    }
  }
}

export function authMiddleware(req: Request, res: Response, next: NextFunction): void {
  const authHeader = req.headers.authorization;
  const token =
    authHeader?.startsWith('Bearer ') ? authHeader.slice(7) : req.cookies?.token;

  if (!token) {
    res.status(401).json({ error: 'No token provided' });
    return;
  }

  try {
    const secret = process.env.JWT_SECRET || 'fallback-secret';
    const payload = jwt.verify(token, secret) as JwtPayload;
    req.user = payload;
    next();
  } catch {
    res.status(401).json({ error: 'Invalid or expired token' });
  }
}

export function optionalAuth(req: Request, res: Response, next: NextFunction): void {
  const authHeader = req.headers.authorization;
  const token =
    authHeader?.startsWith('Bearer ') ? authHeader.slice(7) : req.cookies?.token;

  if (token) {
    try {
      const secret = process.env.JWT_SECRET || 'fallback-secret';
      const payload = jwt.verify(token, secret) as JwtPayload;
      req.user = payload;
    } catch {
      // ignore invalid token for optional auth
    }
  }
  next();
}