import express from "express";
import prometheus from "prom-client";
import dotenv from "dotenv";
import pkg from "pg";

dotenv.config();

const { Client } = pkg;

// --- Connexion PostgreSQL ---
const db = new Client({
  host: process.env.DB_HOST,
  user: process.env.DB_USER,
  password: process.env.DB_PASS,
  database: process.env.DB_NAME,
});

db.connect()
  .then(() => console.log("✅ Connecté à PostgreSQL avec succès"))
  .catch(err => console.error("❌ Erreur de connexion à PostgreSQL :", err));

// --- App Express ---
const app = express();
const port = process.env.PORT || 4000;
app.use(express.json());

// --- Prometheus ---
const register = new prometheus.Registry();
prometheus.collectDefaultMetrics({ register });

const httpRequestsTotal = new prometheus.Counter({
  name: "http_requests_total",
  help: "Nombre total de requêtes HTTP",
  labelNames: ["method", "route", "status"],
  registers: [register],
});

// Route API
app.get("/api", (req, res) => {
  httpRequestsTotal.labels("GET", "/api", "200").inc();
  res.json({ message: "Bienvenue sur The Tip Top API!" });
});

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

app.listen(port, "0.0.0.0", () => {
  console.log(`🚀 Backend The Tip Top lancé sur le port ${port}`);
});