const http = require('http');
const fs = require('fs');
const path = require('path');
const PORT = 8081;

const server = http.createServer((req, res) => {
  let filePath = path.join(__dirname, req.url === '/' ? 'index.html' : req.url);
  const ext = path.extname(filePath);
  const contentTypes = {
    '.html': 'text/html',
    '.css': 'text/css',
    '.js': 'application/javascript',
    '.png': 'image/png',
    '.jpg': 'image/jpeg',
    '.gif': 'image/gif',
    '.svg': 'image/svg+xml',
    '.ico': 'image/x-icon'
  };

  console.log(`[${new Date().toISOString()}] 请求：${req.url} -> ${filePath}`);

  fs.readFile(filePath, (err, data) => {
    if (err) {
      console.error(`文件读取失败：${filePath}`);
      res.writeHead(404, { 'Content-Type': 'text/html' });
      res.end('<h1>404 - 文件未找到</h1>');
    } else {
      const contentType = contentTypes[ext] || 'application/octet-stream';
      console.log(`文件读取成功：${filePath} (${contentType})`);
      res.writeHead(200, { 'Content-Type': contentType });
      res.end(data);
    }
  });
});

server.listen(PORT, () => {
  console.log(`================================`);
  console.log(`🚀 中小企业 CRM 前端服务已启动`);
  console.log(`📡 端口：${PORT}`);
  console.log(`🌐 访问地址：http://localhost:${PORT}`);
  console.log(`📁 文件目录：${__dirname}`);
  console.log(`================================`);
});

server.on('error', (err) => {
  console.error(`服务器错误：${err.message}`);
  process.exit(1);
});