export function fmtDur(s) {
  if (!s || s < 0) return '0:00';
  const h = Math.floor(s / 3600);
  const m = Math.floor((s % 3600) / 60);
  const sec = Math.floor(s % 60);
  const mm = String(m).padStart(2, '0');
  const ss = String(sec).padStart(2, '0');
  return h > 0 ? `${h}:${mm}:${ss}` : `${mm}:${ss}`;
}

export function escapeHtml(s) {
  return (s ?? '').replace(/[&<>"']/g, (c) => ({ '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;', "'": '&#39;' }[c]));
}

export function toast(msg, type = 'info') {
  const t = document.getElementById('toast');
  if (!t) return;
  t.textContent = msg;
  t.className = 'toast show ' + type;
  setTimeout(() => t.classList.remove('show'), 2800);
}