const jwt = require('jsonwebtoken');
const asyncHandler = require('../utils/asyncHandler');
const ErrorResponse = require('../utils/errorResponse');
const User = require('../models/User');

exports.protect = asyncHandler(async (req, res, next) => {
  let token;

  // 1. Check Authorization Header
  if (req.headers.authorization && req.headers.authorization.startsWith('Bearer')) {
    token = req.headers.authorization.split(' ')[1];
  } 
  // 2. Check Cookies
  else if (req.cookies && req.cookies.token) {
    token = req.cookies.token;
  }

  if (!token) {
    console.log(`AUTH_FAILURE: No token found in request to ${req.path}`);
    return next(new ErrorResponse('Not authorized: Neural token missing', 401));
  }

  console.log(`[DEBUG_AUTH] Verifying token: ${token.substring(0, 10)}... (Length: ${token.length})`);

  try {
    const decoded = jwt.verify(token, process.env.JWT_SECRET || 'secret');
    req.user = await User.findById(decoded.id);
    
    if (!req.user) {
      res.clearCookie('token');
      return next(new ErrorResponse('Not authorized: Subject not found in archive. Please log in again.', 401));
    }
    next();
  } catch (err) {
    console.log(`AUTH_FAILURE: Token verification failed (${err.message})`);
    res.clearCookie('token');
    return next(new ErrorResponse('Not authorized: Link signature invalid', 401));
  }
});

exports.authorize = (...roles) => {
  return (req, res, next) => {
    if (!roles.includes(req.user.role)) {
      return next(new ErrorResponse(`Rank ${req.user.role} unauthorized for this sector`, 403));
    }
    next();
  };
};