import jwt from 'jsonwebtoken';
import crypto from 'crypto';
import 'dotenv/config';

const SECRET = process.env.JWT_SECRET || (process.env.NODE_ENV === 'production'
  ? (() => { throw new Error('JWT_SECRET must be configured in production'); })()
  : crypto.randomBytes(32).toString('hex'));

export function signToken(payload) {
  return jwt.sign(payload, SECRET, { expiresIn: '12h' });
}
export function verifyToken(token) {
  return jwt.verify(token, SECRET);
}
export function authMiddleware(req, res, next) {
  // 静态资源与诊断公开
  if (req.path.startsWith('/admin') || req.path.startsWith('/uploads') || req.path === '/health' || req.path === '/') return next();
  // 诊断相关全部公开（问卷、会话、报告、留资、分享、PDF）- 但CMS诊断后台需鉴权
  if (req.path.startsWith('/api/diagnosis/')) return next();
  // 所有 CMS 管理接口（包括 GET）都必须鉴权；只有下方聚合公开接口例外。
  if (req.path === '/api/auth/login' || req.path === '/api/cms/public' || req.path === '/api/contact/leads') return next();
  // 上传也需鉴权
  const auth = req.headers.authorization;
  if (!auth || !auth.startsWith('Bearer ')) {
    if (req.path === '/api/cms/public' || req.path === '/api/contact/leads') return next();
    return res.status(401).json({ code: 401, msg: '未登录' });
  }
  try {
    const token = auth.slice(7);
    const decoded = jwt.verify(token, SECRET);
    req.user = decoded;
    next();
  } catch (e) {
    return res.status(401).json({ code: 401, msg: '登录失效' });
  }
}