// middleware/requireRole.js
const jwt = require('jsonwebtoken');

function requireRole(allowedRoles) {
  return (req, res, next) => {
    const token = req.header('Authorization')?.replace('Bearer ', '');
    
    if (!token) {
      return res.status(401).json({ error: 'Access denied. No token provided.' });
    }

    try {
      const decoded = jwt.verify(token, process.env.JWT_SECRET);
      if (!allowedRoles.includes(decoded.role)) {
        return res.status(403).json({ error: 'Access denied. Insufficient permissions.' });
      }
      req.user = decoded;
      next();
    } catch (error) {
      res.status(400).json({ error: 'Invalid token.' });
    }
  };
}

module.exports = requireRole;