auth.js

const jwt = require('jsonwebtoken');
const User = require('./User');

// Protect routes - only logged-in users can access
const protect = async (req, res, next) => {
  let token;

  // Check if Authorization header exists
  if (req.headers.authorization && req.headers.authorization.startsWith('Bearer')) {
    try {
      // Extract token from "Bearer <token>"
      token = req.headers.authorization.split(' ')[1];

      // Verify token is valid
      const decoded = jwt.verify(token, process.env.JWT_SECRET);

      // Get user from database
      req.user = await User.findById(decoded.id).select('-password');

      if (!req.user) {
        return res.status(401).json({
          success: false,
          message: 'User not found'
        });
      }

      next();
    } catch (error) {
      return res.status(401).json({
        success: false,
        message: 'Not authorized, token failed'
      });
    }
  }

  if (!token) {
    return res.status(401).json({
      success: false,
      message: 'Not authorized, no token provided'
    });
  }
};

module.exports = { protect };