/**
 * Video Player Hydration for MkDocs
 *
 * Automatically converts .video-block placeholders into actual video players
 * when landing pages with video blocks are exported to MkDocs.
 *
 * Supports both standard HTML5 video and advanced player with reactions.
 */

(function() {
  'use strict';

  // Configuration
  const MEDIA_API_URL = window.MEDIA_API_URL || 'http://localhost:4100';
  const PUBLIC_URL = window.PUBLIC_URL || 'http://localhost:3000';

  /**
   * Fetch video metadata from Media API
   */
  async function fetchVideoMetadata(videoId) {
    try {
      const response = await fetch(`${MEDIA_API_URL}/api/videos/${videoId}/metadata`);
      if (!response.ok) {
        throw new Error(`Failed to fetch video ${videoId}: ${response.statusText}`);
      }
      return await response.json();
    } catch (error) {
      console.error(`Error fetching video ${videoId} metadata:`, error);
      return null;
    }
  }

  /**
   * Create standard HTML5 video player
   */
  function createStandardPlayer(metadata, options) {
    const video = document.createElement('video');
    video.src = `${MEDIA_API_URL}/api/videos/${metadata.id}/stream`;
    video.poster = `${MEDIA_API_URL}/api/videos/${metadata.id}/thumbnail`;
    video.controls = options.controls !== false;
    video.autoplay = options.autoplay === true;
    video.loop = options.loop === true;
    video.muted = options.muted === true;
    video.style.width = options.width || '100%';
    video.style.height = options.height || 'auto';
    video.style.maxWidth = '100%';
    video.style.borderRadius = '8px';
    video.style.display = 'block';

    // Add title attribute for accessibility
    video.setAttribute('title', metadata.title);
    video.setAttribute('aria-label', metadata.title);

    return video;
  }

  /**
   * Create advanced player container with reactions
   * Note: Full reaction functionality requires React components,
   * so this is a simplified version for MkDocs
   */
  function createAdvancedPlayer(metadata, options) {
    const container = document.createElement('div');
    container.className = 'advanced-video-container';
    container.style.maxWidth = options.width || '100%';
    container.style.margin = '0 auto';

    // Video player
    const video = createStandardPlayer(metadata, options);
    container.appendChild(video);

    // Reaction placeholder (simplified for MkDocs)
    if (options.showReactions !== false) {
      const reactionBar = document.createElement('div');
      reactionBar.className = 'video-reactions';
      reactionBar.style.marginTop = '12px';
      reactionBar.style.padding = '12px';
      reactionBar.style.background = '#f5f5f5';
      reactionBar.style.borderRadius = '8px';
      reactionBar.style.textAlign = 'center';
      reactionBar.style.fontSize = '14px';
      reactionBar.style.color = '#666';
      reactionBar.innerHTML = `
        <p style="margin: 0;">
          <a href="${PUBLIC_URL}/media/${metadata.id}" target="_blank" style="color: #1890ff; text-decoration: none;">
            View full player with reactions →
          </a>
        </p>
      `;
      container.appendChild(reactionBar);
    }

    // Video metadata
    const metaInfo = document.createElement('div');
    metaInfo.className = 'video-meta';
    metaInfo.style.marginTop = '8px';
    metaInfo.style.fontSize = '13px';
    metaInfo.style.color = '#999';
    metaInfo.innerHTML = `
      <strong style="color: #333;">${escapeHtml(metadata.title)}</strong>
      ${metadata.durationSeconds ? `<span style="margin-left: 8px;">• ${formatDuration(metadata.durationSeconds)}</span>` : ''}
      ${metadata.width && metadata.height ? `<span style="margin-left: 8px;">• ${metadata.width}×${metadata.height}</span>` : ''}
    `;
    container.appendChild(metaInfo);

    return container;
  }

  /**
   * Render a video block
   */
  async function renderVideoBlock(blockElement) {
    const videoId = parseInt(blockElement.dataset.videoId, 10);
    const playerType = blockElement.dataset.playerType || 'standard';
    const width = blockElement.dataset.width || '100%';
    const height = blockElement.dataset.height || 'auto';
    const autoplay = blockElement.dataset.autoplay === 'true';
    const controls = blockElement.dataset.controls !== 'false';
    const showReactions = blockElement.dataset.showReactions !== 'false';

    if (!videoId || isNaN(videoId)) {
      console.warn('Invalid video ID in video block:', blockElement);
      showError(blockElement, 'Invalid video ID');
      return;
    }

    // Show loading state
    blockElement.innerHTML = '<div class="video-loading" style="text-align: center; padding: 40px; color: #999;">Loading video...</div>';

    // Fetch metadata
    const metadata = await fetchVideoMetadata(videoId);
    if (!metadata) {
      showError(blockElement, `Video not found (ID: ${videoId})`);
      return;
    }

    // Create player
    const options = { width, height, autoplay, controls, showReactions };
    const player = playerType === 'advanced'
      ? createAdvancedPlayer(metadata, options)
      : createStandardPlayer(metadata, options);

    // Replace placeholder with player
    blockElement.innerHTML = '';
    blockElement.appendChild(player);

    console.log(`Rendered ${playerType} video player for video ${videoId}`);
  }

  /**
   * Show error state
   */
  function showError(blockElement, message) {
    blockElement.innerHTML = `
      <div class="video-error" style="
        padding: 40px;
        text-align: center;
        background: #fff3f3;
        border: 1px solid #ffccc7;
        border-radius: 8px;
        color: #cf1322;
      ">
        <svg style="width: 48px; height: 48px; margin-bottom: 12px;" fill="currentColor" viewBox="0 0 20 20">
          <path fill-rule="evenodd" d="M10 18a8 8 0 100-16 8 8 0 000 16zM8.707 7.293a1 1 0 00-1.414 1.414L8.586 10l-1.293 1.293a1 1 0 101.414 1.414L10 11.414l1.293 1.293a1 1 0 001.414-1.414L11.414 10l1.293-1.293a1 1 0 00-1.414-1.414L10 8.586 8.707 7.293z" clip-rule="evenodd" />
        </svg>
        <p style="margin: 0; font-weight: 600;">${escapeHtml(message)}</p>
      </div>
    `;
  }

  /**
   * Format duration in seconds to MM:SS
   */
  function formatDuration(seconds) {
    const mins = Math.floor(seconds / 60);
    const secs = Math.floor(seconds % 60);
    return `${mins}:${secs.toString().padStart(2, '0')}`;
  }

  /**
   * Escape HTML to prevent XSS
   */
  function escapeHtml(unsafe) {
    return String(unsafe)
      .replace(/&/g, '&amp;')
      .replace(/</g, '&lt;')
      .replace(/>/g, '&gt;')
      .replace(/"/g, '&quot;')
      .replace(/'/g, '&#039;');
  }

  /**
   * Initialize all video blocks on page load
   */
  function initVideoBlocks() {
    const blocks = document.querySelectorAll('.video-block');
    console.log(`Found ${blocks.length} video block(s) to hydrate`);

    blocks.forEach(block => {
      // Skip if already rendered (has video element)
      if (block.querySelector('video')) {
        console.log('Video block already rendered, skipping');
        return;
      }

      renderVideoBlock(block);
    });
  }

  // Initialize when DOM is ready
  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', initVideoBlocks);
  } else {
    initVideoBlocks();
  }

  // Re-initialize on MkDocs navigation (for SPA-style navigation)
  if (typeof window.document$ !== 'undefined') {
    window.document$.subscribe(() => {
      console.log('MkDocs navigation detected, re-initializing video blocks');
      setTimeout(initVideoBlocks, 100);
    });
  }
})();