// WEVAL Edge Proxy — Sovereign AI Router
// Deploys on Railway (free $5) or Fly.io (free 3 VMs)
const http = require('http');
const https = require('https');

const PORT = process.env.PORT || 3000;
const WEVAL_API = 'https://weval-consulting.com';

const PROVIDERS = {
  groq: { url: 'https://api.groq.com/openai/v1/chat/completions', model: 'llama-3.3-70b-versatile' },
  cf: { url: 'https://api.cloudflare.com/client/v4/accounts/d3d50d5b6fb372afed8d7a8e4b16dd10/ai/run/@cf/meta/llama-3.1-8b-instruct' },
  cfdeep: { url: 'https://api.cloudflare.com/client/v4/accounts/d3d50d5b6fb372afed8d7a8e4b16dd10/ai/run/@cf/deepseek-ai/deepseek-r1-distill-qwen-32b' },
  gemini: { url: 'https://generativelanguage.googleapis.com/v1beta/models/gemini-2.5-flash:generateContent' },
};

function fetch(url, opts) {
  return new Promise((resolve, reject) => {
    const u = new URL(url);
    const mod = u.protocol === 'https:' ? https : http;
    const req = mod.request(u, { method: opts.method || 'GET', headers: opts.headers || {} }, res => {
      let d = '';
      res.on('data', c => d += c);
      res.on('end', () => resolve({ status: res.statusCode, body: d }));
    });
    req.on('error', reject);
    if (opts.body) req.write(opts.body);
    req.end();
  });
}

const server = http.createServer(async (req, res) => {
  res.setHeader('Access-Control-Allow-Origin', '*');
  res.setHeader('Access-Control-Allow-Methods', 'GET,POST,OPTIONS');
  res.setHeader('Access-Control-Allow-Headers', 'Content-Type');
  if (req.method === 'OPTIONS') { res.writeHead(200); return res.end(); }

  // Health check
  if (req.url === '/' || req.url === '/health') {
    res.writeHead(200, { 'Content-Type': 'application/json' });
    return res.end(JSON.stringify({ status: 'ok', service: 'WEVAL Edge Proxy', providers: Object.keys(PROVIDERS), uptime: process.uptime() }));
  }

  // Chat endpoint
  if (req.url === '/chat' && req.method === 'POST') {
    let body = '';
    req.on('data', c => body += c);
    req.on('end', async () => {
      try {
        const { message, provider } = JSON.parse(body);
        if (!message) { res.writeHead(400); return res.end(JSON.stringify({ error: 'message required' })); }
        // Proxy to WEVAL chatbot
        const r = await fetch(WEVAL_API + '/api/weval-ia-fast.php', {
          method: 'POST',
          headers: { 'Content-Type': 'application/json' },
          body: JSON.stringify({ message, mode: 'fast' })
        });
        res.writeHead(200, { 'Content-Type': 'application/json' });
        res.end(r.body);
      } catch (e) {
        res.writeHead(500); res.end(JSON.stringify({ error: e.message }));
      }
    });
    return;
  }

  // Proxy to WEVAL API
  if (req.url.startsWith('/api/')) {
    try {
      const r = await fetch(WEVAL_API + req.url, { method: req.method, headers: { 'Content-Type': 'application/json' } });
      res.writeHead(r.status, { 'Content-Type': 'application/json' });
      res.end(r.body);
    } catch (e) {
      res.writeHead(502); res.end(JSON.stringify({ error: 'upstream error' }));
    }
    return;
  }

  res.writeHead(404); res.end(JSON.stringify({ error: 'not found' }));
});

server.listen(PORT, () => console.log(`WEVAL Edge Proxy running on :${PORT}`));