// Content script for YouTube pages
(function() {
  'use strict';

  // Function to get video information
  function getVideoInfo() {
    const titleElement = document.querySelector('h1.ytd-watch-metadata yt-formatted-string') ||
                        document.querySelector('h1.ytd-video-primary-info-renderer .title') ||
                        document.querySelector('#title h1') ||
                        document.querySelector('h1');

    const title = titleElement ? titleElement.textContent.trim() : document.title;
    const currentUrl = window.location.href;
    const cleanUrl = getCleanVideoUrl(currentUrl);

    return {
      title: title,
      url: cleanUrl,
      videoId: getVideoId(currentUrl)
    };
  }

  // Extract video ID from URL
  function getVideoId(url) {
    const match = url.match(/[?&]v=([^&]+)/);
    return match ? match[1] : null;
  }

  // Clean YouTube URL to only include the video ID
  function getCleanVideoUrl(url) {
    const videoId = getVideoId(url);
    if (videoId) {
      return `https://www.youtube.com/watch?v=${videoId}`;
    }
    return url; // Return original if we can't extract video ID
  }

  // Listen for messages from popup
  chrome.runtime.onMessage.addListener((request, sender, sendResponse) => {
    if (request.action === 'getVideoInfo') {
      const videoInfo = getVideoInfo();
      sendResponse(videoInfo);
    }
    return true; // Keep message channel open for async response
  });

  // Optional: Monitor for navigation changes on YouTube (SPA)
  let lastUrl = location.href;
  new MutationObserver(() => {
    const url = location.href;
    if (url !== lastUrl) {
      lastUrl = url;
      // URL changed, video info might have changed
      console.log('YouTube navigation detected');
    }
  }).observe(document, { subtree: true, childList: true });

})();