import { Pool } from "pg";

// Configuration de la base de données
const dbConfig = {
  host: process.env.DB_HOST || "localhost",
  port: parseInt(process.env.DB_PORT || "5432"),
  database: process.env.DB_NAME || "peakskills",
  user: process.env.DB_USER || "peakskills_user",
  password: process.env.DB_PASSWORD || "peakskills_password",
  // ✅ AJOUT : Configuration optimisée du pool
  max: 20, // Connexions max
  min: 2, // Connexions min
  idleTimeoutMillis: 30000, // 30s
  connectionTimeoutMillis: 2000, // 2s
  acquireTimeoutMillis: 10000, // 10s
  // Optimisations supplémentaires
  allowExitOnIdle: true,
  maxUses: 7500, // Recycler les connexions après 7500 utilisations
};

// Pool de connexions global
let pool: Pool | null = null;

export function getPool(): Pool {
  if (!pool) {
    pool = new Pool(dbConfig);

    pool.on("error", (err) => {
      console.error("Unexpected error on idle client", err);
      process.exit(-1);
    });
  }

  return pool;
}

export async function closePool(): Promise<void> {
  if (pool) {
    await pool.end();
    pool = null;
  }
}