const jwt = require('jsonwebtoken');
const { User } = require('../models'); // Import from models/index.js to get models with associations

const authenticateToken = async (req, res, next) => {
  const authHeader = req.headers['authorization'];
  const token = authHeader && authHeader.split(' ')[1];

  if (!token) {
    return res.status(401).json({ error: 'Access token required' });
  }

  try {
    const decoded = jwt.verify(token, process.env.JWT_SECRET);
    // Handle both 'userId' and 'id' for backward compatibility
    const userId = decoded.userId || decoded.id;
    
    if (!userId) {
      return res.status(401).json({ error: 'Invalid token format' });
    }
    
    const user = await User.findByPk(userId);
    
    if (!user) {
      return res.status(401).json({ error: 'User not found' });
    }

    req.user = user;
    next();
  } catch (error) {
    console.error('Auth middleware error:', error);
    return res.status(403).json({ error: 'Invalid or expired token' });
  }
};

module.exports = { authenticateToken };