import { clsx } from 'clsx';
import { twMerge } from 'tailwind-merge';

export function cn(...inputs) {
  return twMerge(clsx(inputs));
}

export function fmt(amount) {
  return '$' + Number(amount || 0).toFixed(2).replace(/\B(?=(\d{3})+(?!\d))/g, ',');
}

export function fmtDate(dateStr) {
  if (!dateStr) return '—';
  const [y, m, d] = dateStr.split('-');
  return `${parseInt(m)}/${parseInt(d)}/${y}`;
}

export function todayStr() {
  return new Date().toISOString().slice(0, 10);
}

export function fmtUptime(seconds) {
  const d = Math.floor(seconds / 86400);
  const h = Math.floor((seconds % 86400) / 3600);
  const m = Math.floor((seconds % 3600) / 60);
  const s = seconds % 60;
  if (d > 0) return `${d}d ${h}h ${m}m`;
  if (h > 0) return `${h}h ${m}m ${s}s`;
  if (m > 0) return `${m}m ${s}s`;
  return `${s}s`;
}

export function fmtBytes(bytes) {
  if (!bytes) return '0 B';
  if (bytes < 1024)    return `${bytes} B`;
  if (bytes < 1048576) return `${(bytes / 1024).toFixed(1)} KB`;
  return `${(bytes / 1048576).toFixed(2)} MB`;
}