const express = require('express');
const app = express();
app.use(express.json({ limit: '1mb' }));

// تأتي من Settings → Secrets في الـ Space
const API_KEY = process.env.ANTHROPIC_API_KEY;
const APP_TOKEN = process.env.APP_TOKEN; // اختياري: رمز بسيط يرسله تطبيقك

if (!API_KEY) {
  console.error('ANTHROPIC_API_KEY is missing');
  process.exit(1);
}

// فحص أن السيرفر يعمل
app.get('/', (_req, res) => res.send('AISD proxy is running'));

app.post('/ai/messages', async (req, res) => {
  if (APP_TOKEN && req.get('x-app-token') !== APP_TOKEN) {
    return res.status(401).json({ error: 'unauthorized' });
  }

  try {
    const { model, max_tokens, system, tools, tool_choice, messages } = req.body;

    const r = await fetch('https://api.anthropic.com/v1/messages', {
      method: 'POST',
      headers: {
        'content-type': 'application/json',
        'x-api-key': API_KEY,
        'anthropic-version': '2023-06-01',
      },
      body: JSON.stringify({
        model,
        max_tokens: Math.min(max_tokens || 1500, 2000),
        system,
        tools,
        tool_choice,
        messages,
      }),
    });

    res.status(r.status).type('json').send(await r.text());
  } catch (e) {
    res.status(500).json({ error: String(e) });
  }
});

app.listen(process.env.PORT || 7860, '0.0.0.0', () =>
  console.log('Proxy running'),
);