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

const PORT = 13013;

const server = http.createServer((req, res) => {
    // 1. 处理 API 请求
    if (req.url === '/api/chat') {
        if (req.method === 'OPTIONS') {
            res.writeHead(200, {
                'Access-Control-Allow-Origin': '*',
                'Access-Control-Allow-Headers': '*',
                'Access-Control-Allow-Methods': 'POST, OPTIONS'
            });
            res.end();
            return;
        }

        if (req.method === 'POST') {
            const options = {
                hostname: 'opencode.ai',
                path: '/zen/v1/chat/completions',
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json',
                    'Authorization': 'Bearer public',
                    'User-Agent': 'opencode/1.18.12 ai-sdk/provider-utils/4.0.23 runtime/bun/1.3.13',
                    'x-opencode-client': 'cli'
                }
            };

            const proxyReq = https.request(options, (proxyRes) => {
                res.writeHead(proxyRes.statusCode, {
                    ...proxyRes.headers,
                    'Access-Control-Allow-Origin': '*'
                });
                proxyRes.pipe(res);
            });

            proxyReq.on('error', (e) => {
                res.writeHead(500);
                res.end(JSON.stringify({ error: e.message }));
            });

            req.pipe(proxyReq);
        }
        return;
    }

    // 2. 托管本地 HTML 页面 (默认加载同目录下的 public.html)
    const filePath = path.join(__dirname, 'public.html');
    fs.readFile(filePath, (err, data) => {
        if (err) {
            res.writeHead(404, { 'Content-Type': 'text/plain; charset=utf-8' });
            res.end('未找到 public.html 文件，请确认该文件与 server.js 在同一文件夹下！');
        } else {
            res.writeHead(200, { 'Content-Type': 'text/html; charset=utf-8' });
            res.end(data);
        }
    });
});

server.listen(PORT, () => {
    console.log(`服务启动成功！请在浏览器打开地址: http://localhost:${PORT}`);
});