// Content script for Cortex browser extension
// Injected into web pages to extract content

// Extract page content
function extractContent() {
  const title = document.title;

  // Get selected text
  const selection = window.getSelection()?.toString() || '';

  // Try to find main content using common selectors
  let content = '';
  const contentSelectors = [
    'article',
    '[role="main"]',
    'main',
    '.post-content',
    '.article-content',
    '.entry-content',
    '.content',
    '#content',
  ];

  for (const selector of contentSelectors) {
    const el = document.querySelector(selector);
    if (el && el.textContent) {
      content = el.textContent;
      break;
    }
  }

  // Fall back to body content
  if (!content) {
    content = document.body.textContent || '';
  }

  // Clean up content
  content = content
    .replace(/\s+/g, ' ')
    .replace(/\n{3,}/g, '\n\n')
    .trim()
    .slice(0, 100000); // Limit to 100k chars

  // Get meta description
  const metaDesc = document.querySelector('meta[name="description"]')?.content || '';

  // Get author
  const author = document.querySelector('meta[name="author"]')?.content ||
                 document.querySelector('[rel="author"]')?.textContent || '';

  // Get published date
  const datePublished = document.querySelector('meta[property="article:published_time"]')?.content ||
                        document.querySelector('time[datetime]')?.getAttribute('datetime') || '';

  return {
    title,
    content,
    selection,
    excerpt: metaDesc || content.slice(0, 200),
    url: window.location.href,
    author,
    datePublished,
  };
}

// Listen for messages from popup or background
chrome.runtime.onMessage.addListener((request, sender, sendResponse) => {
  if (request.action === 'extract') {
    try {
      const data = extractContent();
      sendResponse(data);
    } catch (err) {
      sendResponse({ error: err.message });
    }
  }
  return true; // Keep channel open for async response
});

// Make extract function available globally for background script injection
window.__cortexExtract = extractContent;