const sql = require('mssql');

let pool = null;

function getConfig() {
  return {
    server: process.env.CLOUD_DB_HOST,
    port: Number(process.env.CLOUD_DB_PORT || 1433),
    database: process.env.CLOUD_DB_NAME,
    user: process.env.CLOUD_DB_USER,
    password: process.env.CLOUD_DB_PASSWORD,
    options: {
      encrypt: String(process.env.CLOUD_DB_SSL || '').toLowerCase() === 'true',
      trustServerCertificate: true,
    },
    pool: {
      max: 6,
      min: 0,
      idleTimeoutMillis: 60000,
    },
    connectionTimeout: 10000,
    requestTimeout: 60000,
  };
}

async function getPool() {
  if (pool?.connected) return pool;
  if (pool) {
    await pool.close().catch(() => {});
  }
  pool = await new sql.ConnectionPool(getConfig()).connect();
  return pool;
}

async function query(sqlText, params = {}) {
  const activePool = await getPool();
  const request = activePool.request();
  Object.entries(params).forEach(([key, value]) => request.input(key, value));
  const result = await request.query(sqlText);
  return result.recordset || [];
}

async function close() {
  if (pool) await pool.close().catch(() => {});
  pool = null;
}

module.exports = {
  query,
  close,
};