frontend/src/utils/index.ts

export const formattedFileSize = (size: number): string => {
  if (size < 1024 * 1024) {
    return `${(size / 1024).toFixed(2)}KB`;
  }
  if (size < 1024 * 1024 * 1024) {
    return `${(size / 1024 / 1024).toFixed(2)}MB`;
  }
  return `${(size / 1024 / 1024 / 1024).toFixed(2)}GB`;
};

export function isMobileDevice() {
  return (
    /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent) ||
    window.innerWidth <= 768
  );
}

export function throttle<T extends (...args: any[]) => any>(fn: T, delay: number): T {
  let lastTime = 0;

  return function (this: any, ...args: Parameters<T>) {
    const now = Date.now();

    if (now - lastTime >= delay) {
      fn.apply(this, args);
      lastTime = now;
    }
  } as T;
}