const http = require('http');
const fs = require('fs');
const path = require('path');
const { spawn } = require('child_process');

const GATEWAY_PORT = 18789;
const WEB_PORT = 7860;

// Start OpenClaw Gateway as child process
console.log('🤖 Checking Telegram...');
if (process.env.TELEGRAM_BOT_TOKEN) {
    console.log(`✅ Telegram Bot Token found (${process.env.TELEGRAM_BOT_TOKEN.substring(0, 8)}...${process.env.TELEGRAM_BOT_TOKEN.slice(-4)})`);
} else {
    console.log('⚠️ No Telegram Bot Token set');
}

const gateway = spawn('openclaw', ['gateway', '--port', String(GATEWAY_PORT), '--bind', 'lan'], {
    stdio: ['pipe', 'inherit', 'inherit'],
    env: {
        ...process.env,
        OPENCLAW_CONFIG_PATH: '/app/openclaw.json',
    }
});

gateway.on('error', (err) => {
    console.error('❌ Failed to start OpenClaw Gateway:', err);
});

gateway.on('exit', (code) => {
    console.log(`❌ OpenClaw Gateway exited with code ${code}`);
});

// Read HTML template
const html = fs.readFileSync(path.join(__dirname, 'index.html'), 'utf-8');

// Create web server for chat UI
const server = http.createServer((req, res) => {
    const url = new URL(req.url, `http://${req.headers.host}`);

    // Serve static files
    if (url.pathname === '/' || url.pathname === '/index.html') {
        res.writeHead(200, { 'Content-Type': 'text/html; charset=utf-8' });
        res.end(html);
        return;
    }

    // Proxy API requests to OpenClaw Gateway
    if (url.pathname.startsWith('/api/')) {
        const options = {
            hostname: '127.0.0.1',
            port: GATEWAY_PORT,
            path: url.pathname + url.search,
            method: req.method,
            headers: {
                ...req.headers,
                host: `127.0.0.1:${GATEWAY_PORT}`,
            }
        };

        const proxyReq = http.request(options, (proxyRes) => {
            res.writeHead(proxyRes.statusCode, proxyRes.headers);
            proxyRes.pipe(res);
        });

        proxyReq.on('error', (err) => {
            res.writeHead(502, { 'Content-Type': 'application/json' });
            res.end(JSON.stringify({ error: 'Gateway unavailable', details: err.message }));
        });

        req.pipe(proxyReq);
        return;
    }

    // 404 for everything else
    res.writeHead(404);
    res.end('Not Found');
});

server.listen(WEB_PORT, '0.0.0.0', () => {
    console.log(`🌐 Web UI running on http://0.0.0.0:${WEB_PORT}`);
    console.log(`🦞 OpenClaw Gateway running on http://127.0.0.1:${GATEWAY_PORT}`);
});

// Graceful shutdown
process.on('SIGTERM', () => {
    console.log('Shutting down...');
    gateway.kill('SIGTERM');
    server.close();
    process.exit(0);
});