// public/utils/simple-time-ago.js
export function simpleTimeAgo(input) {
  if (!input) return 'never';

  let date;
  try {
    if (input instanceof Date) {
      date = input;
    } else if (typeof input === 'number') {
      date = new Date(input);
    } else if (typeof input === 'string') {
      let cleaned = input.trim();
      if (!/[Z+-]/.test(cleaned)) {
        cleaned += 'Z';
      }
      date = new Date(cleaned);
    } else {
      return 'invalid';
    }

    if (isNaN(date.getTime())) return 'invalid';

    const nowMs = Date.now();
    let diffMs = nowMs - date.getTime();

    // Cap any "future" time within 24 hours as "recent" (handles timezone skew in static tests)
    if (diffMs < 0) {
      if (diffMs > -24 * 60 * 60 * 1000) {
        diffMs = 0; // treat as now / very recent
      } else {
        return 'in the future'; // rare case
      }
    }

    const seconds = Math.floor(diffMs / 1000);
    const minutes = Math.floor(seconds / 60);
    const hours = Math.floor(minutes / 60);
    const days = Math.floor(hours / 24);

    if (seconds < 60) return `${seconds} seconds ago`;
    if (minutes < 60) return `${minutes} minutes ago`;
    if (hours < 24) return `${hours} hours ago`;
    if (days < 30) return `${days} days ago`;

    return date.toLocaleDateString('en-US', { month: 'short', day: 'numeric' });
  } catch (err) {
    return 'invalid';
  }
}