const UNITS = ['B', 'KB', 'MB', 'GB'];

export function formatBytes(bytes) {
  if (!bytes || bytes <= 0) return '0 B';
  const exponent = Math.min(Math.floor(Math.log(bytes) / Math.log(1024)), UNITS.length - 1);
  const value = bytes / 1024 ** exponent;
  const rounded = Math.round(value * 10) / 10;
  const formatted = Number.isInteger(rounded) ? String(rounded) : rounded.toFixed(1);
  return `${formatted} ${UNITS[exponent]}`;
}