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

const PORT = process.env.PORT || 11022;
const ROOT_DIR = path.join(__dirname);

const server = http.createServer((req, res) => {
    let filePath = path.join(ROOT_DIR, req.url === '/' ? '/index.html' : req.url);
    
    // SPA fallback: 所有路由都返回 index.html
    const extname = path.extname(filePath);
    if (extname === '' || !['.html', '.js', '.css', '.jpg', '.jpeg', '.png', '.gif', '.svg', '.ico'].includes(extname)) {
        filePath = path.join(ROOT_DIR, 'index.html');
    }
    
    const contentType = {
        '.html': 'text/html',
        '.js': 'application/javascript',
        '.css': 'text/css',
        '.jpg': 'image/jpeg',
        '.png': 'image/png'
    }[extname] || 'application/octet-stream';
    
    fs.readFile(filePath, (err, content) => {
        if (err) {
            res.writeHead(500);
            res.end('Error');
        } else {
            res.writeHead(200, { 
                'Content-Type': contentType,
                'Access-Control-Allow-Origin': '*'
            });
            res.end(content, 'utf-8');
        }
    });
});

server.listen(PORT, () => {
    console.log(`Server running at http://localhost:${PORT}/`);
    console.log(`SPA fallback enabled - all routes return index.html`);
});