const express = require('express');
const path = require('path');
const compression = require('compression');
const helmet = require('helmet');
const { createProxyMiddleware } = require('http-proxy-middleware');

const app = express();
const PORT = process.env.PORT || 3000;

// 安全中间件
app.use(helmet({
  contentSecurityPolicy: false, // 允许内联脚本和样式
}));

// 压缩中间件
app.use(compression());

// API 代理中间件 - 将 /api/* 请求代理到 10.100.5.86:8113
app.use('/api', createProxyMiddleware({
  target: 'http://10.100.51.86:8113',
  changeOrigin: true,
  pathRewrite: {
    '^/api': '/api', // 保持 /api 路径
  },
  onProxyReq: (proxyReq, req, res) => {
    console.log(`🔄 代理请求: ${req.method} ${req.url} -> http://10.100.51.86:8113${req.url}`);
  },
  onProxyRes: (proxyRes, req, res) => {
    console.log(`✅ 代理响应: ${req.method} ${req.url} - 状态码: ${proxyRes.statusCode}`);
  },
  onError: (err, req, res) => {
    console.error(`❌ 代理错误: ${req.method} ${req.url}`, err.message);
    res.status(500).json({ error: '代理请求失败', message: err.message });
  }
}));

// 静态文件服务
app.use(express.static(path.join(__dirname, 'dist')));

// 处理 SPA 路由，所有未匹配的路由都返回 index.html
app.get('*', (req, res) => {
  res.sendFile(path.join(__dirname, 'dist', 'index.html'));
});

// 错误处理中间件
app.use((err, req, res, next) => {
  console.error('服务器错误:', err.stack);
  res.status(500).send('服务器内部错误');
});

app.listen(PORT, () => {
  console.log(`🚀 VDI 管理平台服务器已启动`);
  console.log(`📍 访问地址: http://localhost:${PORT}`);
  console.log(`⏰ 启动时间: ${new Date().toLocaleString()}`);
});

// 优雅关闭
process.on('SIGTERM', () => {
  console.log('收到 SIGTERM 信号，正在关闭服务器...');
  process.exit(0);
});

process.on('SIGINT', () => {
  console.log('收到 SIGINT 信号，正在关闭服务器...');
  process.exit(0);
});