import express from 'express';
import client from 'prom-client';
import dotenv from 'dotenv';

dotenv.config();
const app = express();
const PORT = process.env.PORT || 4000;

// --- Prometheus setup ---
const collectDefaultMetrics = client.collectDefaultMetrics;
collectDefaultMetrics(); // CPU, mémoire, etc.

const httpRequestCounter = new client.Counter({
  name: 'http_requests_total',
  help: 'Nombre total de requêtes HTTP reçues',
  labelNames: ['method', 'route', 'status'],
});

app.use((req, res, next) => {
  res.on('finish', () => {
    httpRequestCounter.inc({
      method: req.method,
      route: req.route?.path || req.path,
      status: res.statusCode,
    });
  });
  next();
});

// --- Ton API existante ---
app.get('/api', (req, res) => {
  res.json({ message: 'API The Tip Top 🚀' });
});

// --- Endpoint de métriques ---
app.get('/metrics', async (req, res) => {
  res.set('Content-Type', client.register.contentType);
  res.end(await client.register.metrics());
});

app.listen(PORT, () => {
  console.log(`🚀 Backend The Tip Top lancé sur le port ${PORT}`);
});