/**
 * Diagnostic script: inspect the actual DOM structure of Reddit chat
 * to understand how media images are rendered.
 *
 * Usage: npx tsx scripts/inspect-chat-dom.ts
 */
import { chromium } from 'playwright';
import path from 'path';

async function main() {
  const sessionDir = '/tmp/reddit-session-copy';

  console.log('Launching browser with session copy...');
  const context = await chromium.launchPersistentContext(sessionDir, {
    headless: false,
    viewport: { width: 1280, height: 720 },
    args: ['--no-sandbox', '--disable-blink-features=AutomationControlled'],
  });

  const page = await context.newPage();
  await page.goto('https://chat.reddit.com/', {
    waitUntil: 'domcontentloaded',
    timeout: 30000,
  });
  await page.waitForTimeout(5000);

  console.log('\n=== Finding chat rooms ===');

  // Find the first chat room and click into it
  const firstChatUrl = await page.evaluate(`
    (function() {
      var rsApp = document.querySelector('rs-app');
      if (!rsApp || !rsApp.shadowRoot) return null;

      // Look for room links
      function findLinks(root) {
        if (!root) return [];
        var links = Array.from(root.querySelectorAll('a[href*="/room/"]'));
        var allElements = root.querySelectorAll('*');
        for (var i = 0; i < allElements.length; i++) {
          if (allElements[i].shadowRoot) {
            links = links.concat(findLinks(allElements[i].shadowRoot));
          }
        }
        return links;
      }

      var links = findLinks(rsApp.shadowRoot);
      if (links.length === 0) return null;
      return links[0].href;
    })()
  `);

  console.log('First chat URL:', firstChatUrl);

  if (firstChatUrl) {
    await page.goto(firstChatUrl, { waitUntil: 'domcontentloaded', timeout: 15000 });
    await page.waitForTimeout(3000);
  }

  console.log('\n=== Inspecting message area DOM structure ===');

  const domInfo = await page.evaluate(`
    (function() {
      var results = {
        rsApp: false,
        rsRoom: false,
        rsRoomShadow: false,
        customElements: [],
        allImages: [],
        messageStructure: [],
        shadowRootChain: [],
      };

      var rsApp = document.querySelector('rs-app');
      if (!rsApp || !rsApp.shadowRoot) {
        results.error = 'No rs-app shadow root found';
        return results;
      }
      results.rsApp = true;

      var rsRoom = rsApp.shadowRoot.querySelector('rs-room');
      if (!rsRoom) {
        results.error = 'No rs-room found';
        return results;
      }
      results.rsRoom = true;
      results.rsRoomShadow = !!rsRoom.shadowRoot;

      // Find ALL custom elements and their shadow roots recursively
      function mapShadowDom(root, depth, path) {
        if (!root || depth > 8) return;
        var allEls = root.querySelectorAll('*');
        for (var i = 0; i < allEls.length; i++) {
          var el = allEls[i];
          var tag = el.tagName.toLowerCase();
          if (tag.includes('-') || el.shadowRoot) {
            var entry = {
              tag: tag,
              depth: depth,
              path: path + ' > ' + tag,
              hasShadow: !!el.shadowRoot,
              childCount: el.childElementCount,
              className: (el.className || '').toString().slice(0, 100),
            };
            results.customElements.push(entry);
            if (el.shadowRoot) {
              mapShadowDom(el.shadowRoot, depth + 1, path + ' > ' + tag + ' [shadow]');
            }
          }
        }
      }

      var searchRoot = rsRoom.shadowRoot || rsRoom;
      mapShadowDom(searchRoot, 0, 'rs-room');

      // Find ALL images recursively through shadow DOMs
      function findAllImages(root, depth, path) {
        if (!root || depth > 8) return;
        var imgs = root.querySelectorAll('img');
        for (var i = 0; i < imgs.length; i++) {
          var img = imgs[i];
          results.allImages.push({
            src: (img.getAttribute('src') || '').slice(0, 200),
            alt: img.getAttribute('alt') || '',
            width: img.width,
            height: img.height,
            naturalWidth: img.naturalWidth,
            naturalHeight: img.naturalHeight,
            className: (img.className || '').toString().slice(0, 100),
            parentTag: img.parentElement ? img.parentElement.tagName.toLowerCase() : 'none',
            parentClass: img.parentElement ? (img.parentElement.className || '').toString().slice(0, 100) : '',
            grandparentTag: img.parentElement && img.parentElement.parentElement ? img.parentElement.parentElement.tagName.toLowerCase() : 'none',
            path: path,
            depth: depth,
          });
        }
        var allEls = root.querySelectorAll('*');
        for (var j = 0; j < allEls.length; j++) {
          if (allEls[j].shadowRoot) {
            findAllImages(allEls[j].shadowRoot, depth + 1, path + ' > ' + allEls[j].tagName.toLowerCase() + '[shadow]');
          }
        }
      }

      findAllImages(searchRoot, 0, 'rs-room');

      // Try to understand message structure: look for repeated patterns
      // Walk the shadow DOM and find elements that look like messages
      function findMessageElements(root, depth, path) {
        if (!root || depth > 8) return;
        var allEls = root.querySelectorAll('*');
        for (var i = 0; i < allEls.length; i++) {
          var el = allEls[i];
          var tag = el.tagName.toLowerCase();
          var cls = (el.className || '').toString().toLowerCase();
          var text = (el.textContent || '').trim();

          // Look for elements that contain message-like content
          if (tag.includes('message') || cls.includes('message') ||
              tag.includes('msg') || cls.includes('msg') ||
              tag.includes('chat') || cls.includes('bubble')) {
            results.messageStructure.push({
              tag: tag,
              className: cls.slice(0, 150),
              path: path,
              depth: depth,
              textSnippet: text.slice(0, 100),
              childCount: el.childElementCount,
              hasImages: el.querySelectorAll('img').length,
              innerHTML: el.innerHTML.slice(0, 300),
            });
          }

          if (el.shadowRoot) {
            findMessageElements(el.shadowRoot, depth + 1, path + ' > ' + tag + '[shadow]');
          }
        }
      }

      findMessageElements(searchRoot, 0, 'rs-room');

      return results;
    })()
  `);

  console.log('\n--- Shadow DOM Structure ---');
  console.log('rs-app:', domInfo.rsApp);
  console.log('rs-room:', domInfo.rsRoom);
  console.log('rs-room has shadow:', domInfo.rsRoomShadow);
  if (domInfo.error) console.log('ERROR:', domInfo.error);

  console.log('\n--- Custom Elements with Shadow Roots ---');
  for (const el of domInfo.customElements || []) {
    console.log(`${'  '.repeat(el.depth)}${el.tag} (shadow: ${el.hasShadow}, children: ${el.childCount}) ${el.className ? '[class: ' + el.className + ']' : ''}`);
  }

  console.log('\n--- All Images Found ---');
  for (const img of domInfo.allImages || []) {
    console.log(`  [depth=${img.depth}] ${img.src}`);
    console.log(`    size: ${img.width}x${img.height} (natural: ${img.naturalWidth}x${img.naturalHeight})`);
    console.log(`    class: ${img.className}`);
    console.log(`    parent: <${img.parentTag} class="${img.parentClass}">`);
    console.log(`    path: ${img.path}`);
    console.log('');
  }

  console.log('\n--- Message-like Elements ---');
  for (const msg of domInfo.messageStructure || []) {
    console.log(`  [depth=${msg.depth}] <${msg.tag}> images=${msg.hasImages}`);
    console.log(`    class: ${msg.className}`);
    console.log(`    text: ${msg.textSnippet}`);
    console.log(`    path: ${msg.path}`);
    console.log(`    html: ${msg.innerHTML}`);
    console.log('');
  }

  // Also dump a broader view - find what's directly inside rs-room shadow
  console.log('\n=== Direct children of message area ===');
  const directChildren = await page.evaluate(`
    (function() {
      var rsApp = document.querySelector('rs-app');
      if (!rsApp || !rsApp.shadowRoot) return 'no rs-app';
      var rsRoom = rsApp.shadowRoot.querySelector('rs-room');
      if (!rsRoom) return 'no rs-room';
      var root = rsRoom.shadowRoot || rsRoom;

      var children = [];
      for (var i = 0; i < root.children.length; i++) {
        var child = root.children[i];
        children.push({
          tag: child.tagName.toLowerCase(),
          className: (child.className || '').toString().slice(0, 200),
          id: child.id || '',
          childCount: child.childElementCount,
          hasShadow: !!child.shadowRoot,
          textSnippet: (child.textContent || '').trim().slice(0, 150),
        });
      }
      return children;
    })()
  `);
  console.log(JSON.stringify(directChildren, null, 2));

  console.log('\nDone. Closing browser...');
  await context.close();
}

main().catch(console.error);