// Utility functions

export function generateId(): string {
  if (typeof crypto !== 'undefined' && crypto.randomUUID) {
    return crypto.randomUUID();
  }
  // Fallback for environments without crypto
  return `id_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
}

export function formatDate(date: Date | string): string {
  const d = typeof date === 'string' ? new Date(date) : date;
  return d.toLocaleDateString('en-US', {
    year: 'numeric',
    month: 'short',
    day: 'numeric',
    hour: '2-digit',
    minute: '2-digit',
  });
}

export function truncateText(text: string, maxLength: number): string {
  if (text.length <= maxLength) return text;
  return text.substring(0, maxLength).trim() + '...';
}

export function stripHtml(html: string): string {
  const tmp = document.createElement('div');
  tmp.innerHTML = html;
  return tmp.textContent || tmp.innerText || '';
}

export function parseFeedUrl(url: string): { host: string; path: string } | null {
  try {
    const parsed = new URL(url);
    return {
      host: parsed.hostname,
      path: parsed.pathname,
    };
  } catch {
    return null;
  }
}

export function guessFeedUrl(baseUrl: string): string[] {
  const commonFeedPaths = [
    '/feed',
    '/rss',
    '/rss.xml',
    '/feed.xml',
    '/atom.xml',
    '/atom',
    '/opml',
  ];
  
  try {
    const url = new URL(baseUrl);
    // Ensure trailing slash for path concatenation
    const base = url.pathname.endsWith('/') ? url.pathname : `${url.pathname}/`;
    
    return commonFeedPaths.map((path) => `${url.origin}${base}${path}`);
  } catch {
    return [];
  }
}