import { Request, Response, NextFunction } from 'express';
import jwt from 'jsonwebtoken';
import { getUserByUsername, User } from './db.js';

const JWT_SECRET = process.env.JWT_SECRET || 'tiktok-rezepte-secret-key-change-in-production';

export interface AuthenticatedRequest extends Request {
  user?: User;
}

export function authMiddleware(req: AuthenticatedRequest, res: Response, next: NextFunction) {
  const authHeader = req.headers.authorization;
  if (!authHeader || !authHeader.startsWith('Bearer ')) {
    return res.status(401).json({ error: 'Nicht authentifiziert' });
  }
  try {
    const token = authHeader.split(' ')[1];
    const decoded = jwt.verify(token, JWT_SECRET) as { username: string };
    const user = getUserByUsername(decoded.username);
    if (!user) return res.status(401).json({ error: 'Benutzer nicht gefunden' });
    req.user = user;
    next();
  } catch {
    res.status(401).json({ error: 'Ungültiges Token' });
  }
}

export function adminMiddleware(req: AuthenticatedRequest, res: Response, next: NextFunction) {
  if (!req.user || !req.user.is_admin) {
    return res.status(403).json({ error: 'Keine Berechtigung' });
  }
  next();
}