/**
 * Utility functions shared across pages.
 */

/**
 * Convert seconds to a human-readable duration string.
 * e.g., 3723 → "1h2m3s"
 */
function secondsToDuration(input) {
  input = parseInt(input, 10);
  if (isNaN(input)) return '0s';

  var out = '';
  var hours = Math.floor(input / 3600);
  if (hours > 0) out += hours + 'h';

  var minutes = Math.floor((input % 3600) / 60);
  if (minutes > 0) out += minutes + 'm';

  var seconds = input % 60;
  out += seconds + 's';

  return out;
}

/**
 * Strip HTML tags from a string.
 */
function stripHtml(text) {
  return text ? String(text).replace(/<[^>]+>/gm, '') : '';
}

/**
 * Format a number with locale-aware separators (fallback).
 */
function formatNumber(n) {
  n = parseInt(n, 10);
  if (isNaN(n)) return '0';
  return n.toLocaleString ? n.toLocaleString() : String(n);
}

/**
 * Check if user is scrolled to the bottom of an element.
 */
function isScrolledToBottom(el) {
  return (el.scrollTop + el.clientHeight) >= (el.scrollHeight - 10);
}