/**
 * Page Transitions
 * Tractatus Framework - Phase 3: Page Transitions
 *
 * Provides smooth fade transitions between pages for better UX
 */

class PageTransitions {
  constructor() {
    this.transitionDuration = 300; // milliseconds
    this.init();
  }

  init() {
    // Add fade-in class to body on page load
    document.body.classList.add('page-fade-in');

    // Attach click handlers to internal links
    this.attachLinkHandlers();

    console.log('[PageTransitions] Initialized');
  }

  attachLinkHandlers() {
    // Get all internal links (href starts with / or is relative)
    const links = document.querySelectorAll('a[href^="/"], a[href^="./"], a[href^="../"]');

    links.forEach(link => {
      // Skip if link has target="_blank" or download attribute
      if (link.getAttribute('target') === '_blank' || link.hasAttribute('download')) {
        return;
      }

      link.addEventListener('click', (e) => {
        // Allow Ctrl/Cmd+click to open in new tab
        if (e.ctrlKey || e.metaKey || e.shiftKey) {
          return;
        }

        // Skip if link has hash (same-page navigation)
        const href = link.getAttribute('href');
        if (href && href.startsWith('#')) {
          return;
        }

        e.preventDefault();
        this.transitionToPage(link.href);
      });
    });

    console.log(`[PageTransitions] Attached handlers to ${links.length} links`);
  }

  transitionToPage(url) {
    // Remove fade-in, add fade-out
    document.body.classList.remove('page-fade-in');
    document.body.classList.add('page-fade-out');

    // Navigate after fade-out completes
    setTimeout(() => {
      window.location.href = url;
    }, this.transitionDuration);
  }
}

// Initialize on DOM ready
if (document.readyState === 'loading') {
  document.addEventListener('DOMContentLoaded', () => {
    new PageTransitions();
  });
} else {
  new PageTransitions();
}

// Export for module systems
if (typeof module !== 'undefined' && module.exports) {
  module.exports = PageTransitions;
}