const jwt = require('jsonwebtoken');
require('dotenv').config();

exports.verifyToken = (req, res, next) => {
  const authHeader = req.headers.authorization;
  if (!authHeader) {
    return res.status(401).json({ success: false, message: 'No token provided' });
  }

  const token = authHeader.split(' ')[1]; // "Bearer <token>"
  if (!token) {
    return res.status(401).json({ success: false, message: 'Invalid token format' });
  }

  try {
    const decoded = jwt.verify(token, process.env.JWT_SECRET);
    req.user = decoded; // { id, email, nickname, ... }
    next();
  } catch (error) {
    console.error('[Auth Middleware] Token Verification Failed:', error.message);
    if (error.name === 'TokenExpiredError') {
      return res.status(401).json({ success: false, message: 'Token expired' });
    }
    return res.status(401).json({ success: false, message: 'Invalid token' });
  }
};