/**
 * 开发环境代理服务器
 * 用于解决跨域问题和统一 API 请求
 */

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

const app = express();
const PORT = 8080;

// 目标 API 服务器地址
const API_TARGET = process.env.API_TARGET || 'http://localhost:3000';

// 配置代理
app.use(
  '/api',
  createProxyMiddleware({
    target: API_TARGET,
    changeOrigin: true,
    pathRewrite: {
      '^/api': '/api', // 保持路径不变，或者根据需要重写
    },
    onProxyReq: (proxyReq, req, res) => {
      console.log(`[Proxy] ${req.method} ${req.url} → ${API_TARGET}${req.url}`);
    },
    onProxyRes: (proxyRes, req, res) => {
      console.log(`[Proxy] ${req.method} ${req.url} ← ${proxyRes.statusCode}`);
    },
    onError: (err, req, res) => {
      console.error('[Proxy Error]', err.message);
      res.status(500).json({
        error: 'Proxy Error',
        message: err.message,
      });
    },
  })
);

// 健康检查
app.get('/health', (req, res) => {
  res.json({
    status: 'ok',
    proxy: API_TARGET,
    timestamp: new Date().toISOString(),
  });
});

app.listen(PORT, () => {
  console.log(`
╔════════════════════════════════════════════════════════╗
║  🚀 Proxy Server Running                              ║
╠════════════════════════════════════════════════════════╣
║  Local:   http://localhost:${PORT}                       ║
║  Target:  ${API_TARGET.padEnd(40)} ║
║  Health:  http://localhost:${PORT}/health                ║
╚════════════════════════════════════════════════════════╝
  `);
});