const { DebugBuilder } = require("./utilities/debugBuilder");
const log = new DebugBuilder("server", "libUtils");

/**
 * sleep - sleep/wait
 * @constructor
 */
exports.sleep = (ms) => new Promise((resolve) => {
    setTimeout(resolve, ms);
  })

/**
 * Normalize a port into a number, string, or false.
 * 
 * @param {*} val Value to be normalized
 * @returns Normalized value
 */
exports.normalizePort = (val) => {
  var port = parseInt(val, 10);

  if (isNaN(port)) {
    // named pipe
    return val;
  }

  if (port >= 0) {
    // port number
    return port;
  }

  return false;
}

/**
 * Event listener for HTTP server "error" event.
 */
exports.onError = (error) => {
  if (error.syscall !== 'listen') {
    throw error;
  }

  var bind = typeof port === 'string'
    ? 'Pipe ' + port
    : 'Port ' + port;

  // handle specific listen errors with friendly messages
  switch (error.code) {
    case 'EACCES':
      log.ERROR(bind + ' requires elevated privileges');
      process.exit(1);
      break;
    case 'EADDRINUSE':
      log.ERROR(bind + ' is already in use');
      process.exit(1);
      break;
    default:
      throw error;
  }
}