/**
 * Metadata Extractor Content Script
 * Extracts page metadata from Open Graph tags, meta tags, and document properties
 */

/**
 * Extract metadata from the current page
 * @returns {object} Metadata object
 */
function extractMetadata() {
  // Helper function to get meta tag content
  const getMeta = (selector) => {
    const element = document.querySelector(selector);
    return element ? element.getAttribute('content') || '' : '';
  };

  // Extract title
  const title =
    getMeta('meta[property="og:title"]') ||
    getMeta('meta[name="twitter:title"]') ||
    document.querySelector('title')?.textContent ||
    document.URL;

  // Extract description
  const description =
    getMeta('meta[property="og:description"]') ||
    getMeta('meta[name="twitter:description"]') ||
    getMeta('meta[name="description"]') ||
    '';

  // Extract image
  const imageUrl =
    getMeta('meta[property="og:image"]') ||
    getMeta('meta[name="twitter:image"]') ||
    '';

  // Extract site name
  const hostname = new URL(document.URL).hostname;
  const siteName =
    getMeta('meta[property="og:site_name"]') ||
    hostname;

  // Extract author
  const author =
    getMeta('meta[name="author"]') ||
    getMeta('meta[property="article:author"]') ||
    '';

  // Extract type
  const type =
    getMeta('meta[property="og:type"]') ||
    'website';

  return {
    url: document.URL,
    title: title.trim(),
    description: description.trim(),
    imageUrl: imageUrl.trim(),
    siteName: siteName.trim(),
    author: author.trim(),
    type: type.trim(),
  };
}

// Listen for messages from popup
chrome.runtime.onMessage.addListener((request, sender, sendResponse) => {
  if (request.action === 'extractMetadata') {
    const metadata = extractMetadata();
    sendResponse(metadata);
  }
});

// Also send metadata automatically if requested
if (window === window.top) {
  // Only run in top frame, not iframes
  console.log('Metadata extractor loaded');
}