import React, { useCallback, useEffect, useRef, useState } from 'react';
import { IPreviewUrlResponse } from 'matrix-js-sdk';
import { Box, Icon, IconButton, Icons, Scroll, Spinner, Text, as, color, config } from 'folds';
import { ImageOverlay } from '../ImageOverlay';
import { AsyncStatus, useAsyncCallback } from '../../hooks/useAsyncCallback';
import { useMatrixClient } from '../../hooks/useMatrixClient';
import { UrlPreview, UrlPreviewContent, UrlPreviewDescription, UrlPreviewImg } from './UrlPreview';
import {
  getIntersectionObserverEntry,
  useIntersectionObserver,
} from '../../hooks/useIntersectionObserver';
import * as css from './UrlPreviewCard.css';
import * as previewCss from './UrlPreview.css';
import { tryDecodeURIComponent } from '../../utils/dom';
import { mxcUrlToHttp } from '../../utils/matrix';
import { useMediaAuthentication } from '../../hooks/useMediaAuthentication';
import { ImageViewer } from '../image-viewer';
import { onEnterOrSpace } from '../../utils/keyboard';

const linkStyles = { color: color.Success.Main };

// ---------------------------------------------------------------------------
// Helpers — URL parsing & variant detection
// ---------------------------------------------------------------------------

type CardVariant =
  | 'youtube-shorts'
  | 'youtube'
  | 'tiktok'
  | 'vimeo'
  | 'github'
  | 'twitter'
  | 'reddit'
  | 'spotify'
  | 'twitch'
  | 'steam'
  | 'wikipedia'
  | 'discord'
  | 'npm'
  | 'stackoverflow'
  | 'imdb'
  | 'giphy'
  | 'tenor'
  | 'generic';

function getYouTubeVideoId(url: string): string | null {
  try {
    const parsed = new URL(url);
    const { hostname, pathname, searchParams } = parsed;

    // youtu.be/<id>
    if (hostname === 'youtu.be') {
      const id = pathname.slice(1).split('/')[0];
      return id || null;
    }

    // youtube.com/watch?v=<id>
    if (hostname === 'www.youtube.com' || hostname === 'youtube.com') {
      if (pathname === '/watch') {
        return searchParams.get('v');
      }
      // youtube.com/shorts/<id> — handled by isYouTubeShorts
      const shortsMatch = pathname.match(/^\/shorts\/([A-Za-z0-9_-]+)/);
      if (shortsMatch) return shortsMatch[1];
    }
  } catch {
    // ignore malformed URLs
  }
  return null;
}

function isYouTubeShorts(url: string): boolean {
  try {
    const { hostname, pathname } = new URL(url);
    if (hostname !== 'www.youtube.com' && hostname !== 'youtube.com') return false;
    return /^\/shorts\/[A-Za-z0-9_-]+/.test(pathname);
  } catch {
    return false;
  }
}

function getYoutubeShortsId(url: string): string | null {
  try {
    const { hostname, pathname } = new URL(url);
    if (hostname !== 'www.youtube.com' && hostname !== 'youtube.com') return null;
    const m = pathname.match(/^\/shorts\/([A-Za-z0-9_-]+)/);
    return m ? m[1] : null;
  } catch {
    return null;
  }
}

function isTikTok(url: string): boolean {
  try {
    const { hostname } = new URL(url);
    const h = hostname.replace(/^www\./, '');
    return h === 'tiktok.com' || h === 'vm.tiktok.com';
  } catch {
    return false;
  }
}

function getTikTokUsername(url: string): string | null {
  try {
    const { pathname } = new URL(url);
    const m = pathname.match(/\/((@[^/]+))/);
    return m ? m[1] : null;
  } catch {
    return null;
  }
}

function getVimeoVideoId(url: string): string | null {
  try {
    const parsed = new URL(url);
    const { hostname, pathname } = parsed;
    if (hostname !== 'vimeo.com' && hostname !== 'www.vimeo.com') return null;
    const m = pathname.match(/^\/(\d+)/);
    return m ? m[1] : null;
  } catch {
    return null;
  }
}

function isGitHubRepo(url: string): boolean {
  try {
    const parsed = new URL(url);
    const { hostname, pathname } = parsed;
    if (hostname !== 'github.com' && hostname !== 'www.github.com') return false;
    // Exactly two path segments: /<owner>/<repo>  (no deeper pages)
    const parts = pathname.replace(/\/$/, '').split('/').filter(Boolean);
    return parts.length === 2;
  } catch {
    return false;
  }
}

function isTwitter(url: string): boolean {
  try {
    const { hostname } = new URL(url);
    const h = hostname.replace(/^www\./, '');
    return h === 'twitter.com' || h === 'x.com';
  } catch {
    return false;
  }
}

function isTwitterTweet(url: string): boolean {
  try {
    const { hostname, pathname } = new URL(url);
    const h = hostname.replace(/^www\./, '');
    if (h !== 'twitter.com' && h !== 'x.com') return false;
    return /\/status\/\d+/.test(pathname);
  } catch {
    return false;
  }
}

function getRedditInfo(url: string): {
  subreddit: string | null;
  isPost: boolean;
  isUser: boolean;
  postId: string | null;
} {
  try {
    const { hostname, pathname } = new URL(url);
    const h = hostname.replace(/^www\./, '');
    if (h !== 'reddit.com' && h !== 'redd.it') {
      return { subreddit: null, isPost: false, isUser: false, postId: null };
    }
    const subMatch = pathname.match(/^\/r\/([^/]+)/);
    const subreddit = subMatch ? subMatch[1] : null;
    const postMatch = pathname.match(/\/comments\/([^/]+)/);
    const postId = postMatch ? postMatch[1] : null;
    const userMatch = pathname.match(/^\/(u|user)\/([^/]+)/);
    return {
      subreddit,
      isPost: !!postId,
      isUser: !!userMatch,
      postId,
    };
  } catch {
    return { subreddit: null, isPost: false, isUser: false, postId: null };
  }
}

function getRedditSubreddit(url: string): string | null {
  return getRedditInfo(url).subreddit;
}

function getSpotifyType(url: string): string | null {
  try {
    const { hostname, pathname } = new URL(url);
    if (hostname !== 'open.spotify.com') return null;
    const m = pathname.match(/^\/(track|album|playlist|artist)\//);
    return m ? m[1] : null;
  } catch {
    return null;
  }
}

function getTwitchType(url: string): 'live' | 'clip' | 'vod' | null {
  try {
    const { hostname, pathname } = new URL(url);
    const h = hostname.replace(/^www\./, '');
    if (h === 'clips.twitch.tv') return 'clip';
    if (h !== 'twitch.tv') return null;
    if (pathname.match(/\/[^/]+\/clip\//)) return 'clip';
    if (pathname.match(/\/[^/]+\/v(?:ideos?)?\//)) return 'vod';
    // Single path segment = channel
    const parts = pathname.replace(/\/$/, '').split('/').filter(Boolean);
    if (parts.length === 1) return 'live';
    return null;
  } catch {
    return null;
  }
}

function getTwitchChannel(url: string): string | null {
  try {
    const { hostname, pathname } = new URL(url);
    const h = hostname.replace(/^www\./, '');
    if (h === 'clips.twitch.tv') return null;
    if (h !== 'twitch.tv') return null;
    const parts = pathname.replace(/\/$/, '').split('/').filter(Boolean);
    return parts[0] ?? null;
  } catch {
    return null;
  }
}

function isTwitch(url: string): boolean {
  try {
    const { hostname } = new URL(url);
    const h = hostname.replace(/^www\./, '');
    return h === 'twitch.tv' || h === 'clips.twitch.tv';
  } catch {
    return false;
  }
}

function isSteamApp(url: string): boolean {
  try {
    const { hostname, pathname } = new URL(url);
    const h = hostname.replace(/^www\./, '');
    if (h !== 'store.steampowered.com') return false;
    return pathname.startsWith('/app/');
  } catch {
    return false;
  }
}

function isWikipedia(url: string): boolean {
  try {
    const { hostname, pathname } = new URL(url);
    return hostname.endsWith('.wikipedia.org') && pathname.startsWith('/wiki/');
  } catch {
    return false;
  }
}

function isDiscordInvite(url: string): boolean {
  try {
    const { hostname, pathname } = new URL(url);
    const h = hostname.replace(/^www\./, '');
    return (
      (h === 'discord.gg' || h === 'discord.com') &&
      (pathname.startsWith('/invite/') || h === 'discord.gg')
    );
  } catch {
    return false;
  }
}

function isNpm(url: string): boolean {
  try {
    const { hostname, pathname } = new URL(url);
    const h = hostname.replace(/^www\./, '');
    return h === 'npmjs.com' && pathname.startsWith('/package/');
  } catch {
    return false;
  }
}

function isStackOverflow(url: string): boolean {
  try {
    const { hostname, pathname } = new URL(url);
    const h = hostname.replace(/^www\./, '');
    return h === 'stackoverflow.com' && pathname.startsWith('/questions/');
  } catch {
    return false;
  }
}

function isImdb(url: string): boolean {
  try {
    const { hostname, pathname } = new URL(url);
    const h = hostname.replace(/^www\./, '');
    return h === 'imdb.com' && pathname.startsWith('/title/');
  } catch {
    return false;
  }
}

function isGiphy(url: string): boolean {
  try {
    const { hostname, pathname } = new URL(url);
    const h = hostname.replace(/^www\./, '');
    if (h === 'gph.is') return true;
    if (h === 'giphy.com' || h === 'media.giphy.com') {
      return (
        pathname.startsWith('/gifs/') ||
        pathname.startsWith('/clips/') ||
        pathname.startsWith('/media/')
      );
    }
    return false;
  } catch {
    return false;
  }
}

function isTenor(url: string): boolean {
  try {
    const { hostname, pathname } = new URL(url);
    const h = hostname.replace(/^www\./, '');
    return h === 'tenor.com' && pathname.startsWith('/view/');
  } catch {
    return false;
  }
}

function getCardVariant(url: string): CardVariant {
  // Shorts must be detected before generic youtube
  if (isYouTubeShorts(url)) return 'youtube-shorts';
  if (getYouTubeVideoId(url) !== null) return 'youtube';
  if (isTikTok(url)) return 'tiktok';
  if (getVimeoVideoId(url) !== null) return 'vimeo';
  if (isGitHubRepo(url)) return 'github';
  if (isTwitter(url)) return 'twitter';
  if (getRedditSubreddit(url) !== null) return 'reddit';
  if (getSpotifyType(url) !== null) return 'spotify';
  if (isTwitch(url)) return 'twitch';
  if (isSteamApp(url)) return 'steam';
  if (isWikipedia(url)) return 'wikipedia';
  if (isDiscordInvite(url)) return 'discord';
  if (isNpm(url)) return 'npm';
  if (isStackOverflow(url)) return 'stackoverflow';
  if (isImdb(url)) return 'imdb';
  if (isGiphy(url)) return 'giphy';
  if (isTenor(url)) return 'tenor';
  return 'generic';
}

function getDomain(url: string): string {
  try {
    return new URL(url).hostname.replace(/^www\./, '');
  } catch {
    return url;
  }
}

// ---------------------------------------------------------------------------
// Parsing helpers for individual cards
// ---------------------------------------------------------------------------

interface ParsedTweet {
  name: string;
  handle?: string;
  text?: string;
}

function parseTweetTitle(ogTitle: string): ParsedTweet {
  // Pattern 1: "Name on X: \"tweet text\"" or "Name on Twitter: \"tweet text\""
  const onXMatch = ogTitle.match(/^(.+?) on (?:X|Twitter):\s*["""](.+)["""]?$/s);
  if (onXMatch) return { name: onXMatch[1], text: onXMatch[2] };

  // Pattern 2: "X / Name (@handle)" or "Twitter / Name (@handle)"
  const xSlashMatch = ogTitle.match(/^(?:X|Twitter)\s*\/\s*(.+?)\s*\(@(.+?)\)/);
  if (xSlashMatch) return { name: xSlashMatch[1], handle: xSlashMatch[2] };

  // Pattern 3: "Name (@handle): text" or "Name (@handle)"
  const handleMatch = ogTitle.match(/^(.+?)\s*\(@(.+?)\)(?::\s*(.+))?$/s);
  if (handleMatch) return { name: handleMatch[1], handle: handleMatch[2], text: handleMatch[3] };

  return { name: ogTitle };
}

function parseTikTokTitle(ogTitle: string): { username: string | null; caption: string | null } {
  // Format 1: "@username on TikTok: "caption""
  const fmt1 = ogTitle.match(/^(@\S+)\s+on\s+TikTok:\s*["""](.+)["""]?$/s);
  if (fmt1) return { username: fmt1[1], caption: fmt1[2] };

  // Format 2: "username TikTok | caption"
  const fmt2 = ogTitle.match(/^(.+?)\s+TikTok\s*\|\s*(.+)$/s);
  if (fmt2) return { username: fmt2[1], caption: fmt2[2] };

  // Format 3: just caption
  return { username: null, caption: ogTitle || null };
}

function extractHashtags(text: string): string[] {
  const found: string[] = [];
  const re = /#\w+/g;
  let m = re.exec(text);
  while (m !== null && found.length < 5) {
    found.push(m[0]);
    m = re.exec(text);
  }
  return found;
}

function parseRedditMeta(ogDescription: string): {
  author: string | null;
  upvotes: string | null;
  comments: string | null;
} {
  let author: string | null = null;
  let upvotes: string | null = null;
  let comments: string | null = null;

  const authorM = ogDescription.match(/Posted\s+by\s+u\/(\S+)/i);
  if (authorM) author = authorM[1];

  const pointsM = ogDescription.match(/([\d,.]+[kKmM]?)\s+(?:points?|upvotes?)/i);
  if (pointsM) upvotes = pointsM[1];

  const commentsM = ogDescription.match(/([\d,.]+[kKmM]?)\s+comments?/i);
  if (commentsM) comments = commentsM[1];

  return { author, upvotes, comments };
}

function parseTwitchGame(ogDescription: string): string | null {
  const m = ogDescription.match(/play(?:ing)?\s+(.+?)(?:\s*[-–—]|\s*\d+\s+viewer|$)/i);
  return m ? m[1].trim() : null;
}

// ---------------------------------------------------------------------------
// Inline SVG logos
// ---------------------------------------------------------------------------

function GitHubIcon({ size = 24 }: { size?: number }) {
  return (
    <svg
      width={size}
      height={size}
      viewBox="0 0 24 24"
      fill="currentColor"
      aria-hidden="true"
      role="img"
    >
      <path d="M12 .297c-6.63 0-12 5.373-12 12 0 5.303 3.438 9.8 8.205 11.385.6.113.82-.258.82-.577 0-.285-.01-1.04-.015-2.04-3.338.724-4.042-1.61-4.042-1.61C4.422 18.07 3.633 17.7 3.633 17.7c-1.087-.744.084-.729.084-.729 1.205.084 1.838 1.236 1.838 1.236 1.07 1.835 2.809 1.305 3.495.998.108-.776.417-1.305.76-1.605-2.665-.3-5.466-1.332-5.466-5.93 0-1.31.465-2.38 1.235-3.22-.135-.303-.54-1.523.105-3.176 0 0 1.005-.322 3.3 1.23.96-.267 1.98-.399 3-.405 1.02.006 2.04.138 3 .405 2.28-1.552 3.285-1.23 3.285-1.23.645 1.653.24 2.873.12 3.176.765.84 1.23 1.91 1.23 3.22 0 4.61-2.805 5.625-5.475 5.92.42.36.81 1.096.81 2.22 0 1.606-.015 2.896-.015 3.286 0 .315.21.69.825.57C20.565 22.092 24 17.592 24 12.297c0-6.627-5.373-12-12-12" />
    </svg>
  );
}

function XLogoIcon({ size = 20 }: { size?: number }) {
  return (
    <svg
      width={size}
      height={size}
      viewBox="0 0 24 24"
      fill="currentColor"
      aria-hidden="true"
      role="img"
    >
      <path d="M18.244 2.25h3.308l-7.227 8.26 8.502 11.24H16.17l-4.714-6.231-5.401 6.231H2.744l7.737-8.847L2 2.25h6.957l4.265 5.64L18.244 2.25zm-1.161 17.52h1.833L7.084 4.126H5.117L17.083 19.77z" />
    </svg>
  );
}

// ---------------------------------------------------------------------------
// Shared badge component
// ---------------------------------------------------------------------------

function SiteBadge({ label, colorClass }: { label: string; colorClass: string }) {
  return (
    <span className={`${previewCss.SiteBadge} ${colorClass}`} aria-label={label}>
      {label}
    </span>
  );
}

// ---------------------------------------------------------------------------
// Shared VideoCard — used by YouTube (non-Shorts) and Vimeo
// ---------------------------------------------------------------------------

function VideoCard({
  url,
  prev,
  thumbnailUrl,
  siteBadgeLabel,
  siteBadgeClass,
  showPlayButton,
}: {
  url: string;
  prev: IPreviewUrlResponse;
  thumbnailUrl: string;
  siteBadgeLabel: string;
  siteBadgeClass: string;
  showPlayButton?: boolean;
}) {
  const title = prev['og:title'] ?? '';
  const description = prev['og:description'] ?? '';

  return (
    <>
      <a
        href={url}
        target="_blank"
        rel="noreferrer"
        className={previewCss.MediaThumbnailWrapper}
        aria-label={`Watch on ${siteBadgeLabel}: ${title}`}
      >
        <img
          className={previewCss.MediaThumbnailImg}
          src={thumbnailUrl}
          alt={title}
          loading="lazy"
        />
        {showPlayButton !== false && (
          <div className={previewCss.MediaPlayOverlay}>
            <div className={previewCss.MediaPlayButton}>
              <Icon size="400" src={Icons.Play} />
            </div>
          </div>
        )}
      </a>
      <UrlPreviewContent>
        <Text
          style={linkStyles}
          truncate
          as="a"
          href={url}
          target="_blank"
          rel="noreferrer"
          size="T200"
          priority="300"
        >
          <SiteBadge label={siteBadgeLabel} colorClass={siteBadgeClass} />
        </Text>
        {title && (
          <Text truncate priority="400">
            <b>{title}</b>
          </Text>
        )}
        {description && (
          <Text size="T200" priority="300">
            <UrlPreviewDescription>{description}</UrlPreviewDescription>
          </Text>
        )}
      </UrlPreviewContent>
    </>
  );
}

// ---------------------------------------------------------------------------
// Card 1: YouTube Shorts
// ---------------------------------------------------------------------------

function YouTubeShortsCard({ url, prev }: { url: string; prev: IPreviewUrlResponse }) {
  const videoId = getYoutubeShortsId(url) ?? '';
  const thumbnailSrc = `https://img.youtube.com/vi/${videoId}/mqdefault.jpg`;
  const title = prev['og:title'] ?? '';
  // YouTube Shorts og:description is often the channel name
  const rawDescription = (prev['og:description'] as string | undefined) ?? '';
  const channelName = rawDescription.length < 80 ? rawDescription : null;

  return (
    <>
      {/* Header bar with Shorts badge */}
      <div className={previewCss.ShortsHeader}>
        <SiteBadge label="Shorts" colorClass={previewCss.BadgeYouTubeShorts} />
        <Text size="T200" priority="300" style={{ opacity: 0.7 }}>
          YouTube
        </Text>
      </div>
      {/* Side-by-side layout */}
      <div className={previewCss.PortraitSideLayout}>
        <a
          href={url}
          target="_blank"
          rel="noreferrer"
          className={previewCss.PortraitThumbnail}
          aria-label={`Watch Short: ${title}`}
        >
          <img
            className={previewCss.PortraitThumbnailImg}
            src={thumbnailSrc}
            alt={title}
            loading="lazy"
          />
          <div className={previewCss.PortraitPlayOverlay}>
            <div className={previewCss.PortraitPlayButton}>▶</div>
          </div>
        </a>
        <Box grow="Yes" direction="Column" gap="100">
          {title && (
            <Text
              priority="400"
              style={{
                fontWeight: 700,
                display: '-webkit-box',
                WebkitLineClamp: 2,
                WebkitBoxOrient: 'vertical',
                overflow: 'hidden',
              }}
            >
              {title}
            </Text>
          )}
          {channelName && (
            <Text size="T200" priority="300" style={{ opacity: 0.65 }}>
              {channelName}
            </Text>
          )}
          <Text
            size="T200"
            priority="300"
            style={{ opacity: 0.5, marginTop: 'auto' }}
            as="a"
            href={url}
            target="_blank"
            rel="noreferrer"
          >
            youtube.com
          </Text>
        </Box>
      </div>
    </>
  );
}

// ---------------------------------------------------------------------------
// Card 2: TikTok
// ---------------------------------------------------------------------------

function TikTokCard({
  url,
  prev,
  mx,
  useAuthentication,
}: {
  url: string;
  prev: IPreviewUrlResponse;
  mx: ReturnType<typeof useMatrixClient>;
  useAuthentication: boolean;
}) {
  const rawTitle = (prev['og:title'] as string | undefined) ?? '';
  const rawDescription = (prev['og:description'] as string | undefined) ?? '';
  const mxcImage = prev['og:image'] as string | undefined;

  const thumbSrc = mxcImage
    ? mxcUrlToHttp(mx, mxcImage, useAuthentication, 160, 284, 'scale', false)
    : null;

  const { username: parsedUsername, caption: parsedCaption } = parseTikTokTitle(rawTitle);
  const usernameFromUrl = getTikTokUsername(url);
  const username = parsedUsername ?? usernameFromUrl;
  const caption = parsedCaption ?? rawDescription;

  // Extract hashtags from caption and description combined
  const hashtagSource = `${caption ?? ''} ${rawDescription}`;
  const hashtags = extractHashtags(hashtagSource);

  // Strip hashtags from caption display
  const captionDisplay = caption ? caption.replace(/#\w+/g, '').trim() : '';

  return (
    <>
      {/* Header */}
      <div className={previewCss.ShortsHeader}>
        {/* TikTok badge with musical note icon */}
        <span className={`${previewCss.SiteBadge} ${previewCss.BadgeTikTok}`}>
          <span style={{ color: '#EE1D52', marginRight: '2px' }}>♫</span>
          TikTok
        </span>
        {username && (
          <Text size="T200" priority="300" style={{ opacity: 0.75 }}>
            {username}
          </Text>
        )}
        <Box grow="Yes" />
        <Text
          size="T200"
          priority="300"
          style={{ opacity: 0.45 }}
          as="a"
          href={url}
          target="_blank"
          rel="noreferrer"
        >
          tiktok.com
        </Text>
      </div>
      {/* Body */}
      <div className={previewCss.PortraitSideLayout}>
        {thumbSrc ? (
          <a
            href={url}
            target="_blank"
            rel="noreferrer"
            className={previewCss.PortraitThumbnail}
            aria-label={`Watch TikTok: ${caption ?? ''}`}
          >
            <img
              className={previewCss.PortraitThumbnailImg}
              src={thumbSrc}
              alt={captionDisplay}
              loading="lazy"
            />
            <div className={previewCss.PortraitPlayOverlay}>
              <div className={previewCss.PortraitPlayButton}>▶</div>
            </div>
          </a>
        ) : (
          <div className={previewCss.PortraitPlaceholder}>
            <span style={{ color: '#EE1D52' }}>♫</span>
          </div>
        )}
        <Box grow="Yes" direction="Column" gap="100">
          {captionDisplay && (
            <Text
              size="T300"
              priority="400"
              style={{
                display: '-webkit-box',
                WebkitLineClamp: 3,
                WebkitBoxOrient: 'vertical',
                overflow: 'hidden',
              }}
            >
              {captionDisplay}
            </Text>
          )}
          {hashtags.length > 0 && (
            <div>
              {hashtags.map((tag) => (
                <span key={tag} className={previewCss.HashtagChip}>
                  {tag}
                </span>
              ))}
            </div>
          )}
        </Box>
      </div>
    </>
  );
}

// ---------------------------------------------------------------------------
// Card 3: Twitter / X
// ---------------------------------------------------------------------------

function TwitterCard({
  url,
  prev,
  mx,
  useAuthentication,
}: {
  url: string;
  prev: IPreviewUrlResponse;
  mx: ReturnType<typeof useMatrixClient>;
  useAuthentication: boolean;
}) {
  const rawTitle = (prev['og:title'] as string | undefined) ?? '';
  const rawDescription = (prev['og:description'] as string | undefined) ?? '';
  const mxcImage = prev['og:image'] as string | undefined;
  const imageWidth = prev['og:image:width'] as number | undefined;

  const isTweet = isTwitterTweet(url);
  const { name, handle, text } = parseTweetTitle(rawTitle);

  const tweetText = text ?? (isTweet ? rawDescription : undefined);

  // Show media image if og:image is wide (>= 300px or unspecified with a tweet URL)
  const showMedia = !!mxcImage && (imageWidth === undefined || imageWidth >= 300) && isTweet;
  const mediaThumbSrc = showMedia
    ? mxcUrlToHttp(mx, mxcImage!, useAuthentication, 400, 200, 'scale', false)
    : null;

  return (
    <>
      {/* Header row */}
      <div className={previewCss.TwitterHeader}>
        <XLogoIcon size={18} />
        <Text priority="400" style={{ fontWeight: 600 }} truncate>
          {name}
        </Text>
        {handle && (
          <Text size="T200" priority="300" style={{ opacity: 0.55 }} truncate>
            @{handle}
          </Text>
        )}
        <Box grow="Yes" />
        <SiteBadge label="𝕏" colorClass={previewCss.BadgeTwitter} />
      </div>

      <UrlPreviewContent>
        {isTweet && tweetText ? (
          <div className={previewCss.TweetBlock}>{tweetText}</div>
        ) : (
          !isTweet &&
          rawDescription && (
            <Text size="T200" priority="300">
              <UrlPreviewDescription>{rawDescription}</UrlPreviewDescription>
            </Text>
          )
        )}

        {mediaThumbSrc && (
          <img
            className={previewCss.TweetMediaImg}
            src={mediaThumbSrc}
            alt={tweetText ?? name}
            loading="lazy"
          />
        )}

        <Text
          size="T200"
          priority="300"
          style={{ opacity: 0.5 }}
          as="a"
          href={url}
          target="_blank"
          rel="noreferrer"
        >
          {getDomain(url)}
        </Text>
      </UrlPreviewContent>
    </>
  );
}

// ---------------------------------------------------------------------------
// Card 4: Twitch
// ---------------------------------------------------------------------------

function TwitchCard({
  url,
  prev,
  mx,
  useAuthentication,
}: {
  url: string;
  prev: IPreviewUrlResponse;
  mx: ReturnType<typeof useMatrixClient>;
  useAuthentication: boolean;
}) {
  const title = (prev['og:title'] as string | undefined) ?? '';
  const description = (prev['og:description'] as string | undefined) ?? '';
  const mxcImage = prev['og:image'] as string | undefined;

  const twitchType = getTwitchType(url) ?? 'live';
  const channel = getTwitchChannel(url);
  const isLive = twitchType === 'live';

  const game = description ? parseTwitchGame(description) : null;

  const thumbSrc = mxcImage
    ? mxcUrlToHttp(mx, mxcImage, useAuthentication, 480, 270, 'scale', false)
    : null;

  return (
    <>
      {/* Thumbnail */}
      {thumbSrc ? (
        <a
          href={url}
          target="_blank"
          rel="noreferrer"
          className={previewCss.TwitchThumbnailWrapper}
          aria-label={`Watch on Twitch: ${title}`}
        >
          <img
            className={previewCss.TwitchThumbnailImg}
            src={thumbSrc}
            alt={title}
            loading="lazy"
          />
          {isLive ? (
            <div className={previewCss.TwitchLiveOverlay}>
              <div className={previewCss.LiveDot} />
              LIVE
            </div>
          ) : (
            <div className={previewCss.MediaPlayOverlay}>
              <div className={previewCss.MediaPlayButton}>
                <Icon size="400" src={Icons.Play} />
              </div>
            </div>
          )}
        </a>
      ) : (
        <Box
          shrink="No"
          alignItems="Center"
          justifyContent="Center"
          className={previewCss.IconWrapper}
        >
          <svg
            width={28}
            height={28}
            viewBox="0 0 24 24"
            fill="#9146ff"
            aria-hidden="true"
            role="img"
          >
            <path d="M11.64 5.93h1.43v4.28h-1.43m3.93-4.28H17v4.28h-1.43M7 2L3.43 5.57v12.86h4.28V22l3.58-3.57h2.85L20.57 12V2m-1.43 9.29-2.85 2.85h-2.86l-2.5 2.5v-2.5H7.71V3.43h11.43z" />
          </svg>
        </Box>
      )}

      {/* Content */}
      <UrlPreviewContent>
        <Box alignItems="Center" gap="100" wrap="Wrap">
          <SiteBadge label="Twitch" colorClass={previewCss.BadgeTwitch} />
          {channel && (
            <Text priority="400" style={{ fontWeight: 600 }}>
              {channel}
            </Text>
          )}
          {isLive && (
            <span className={previewCss.TwitchLiveBadge} style={{ marginLeft: '4px' }}>
              LIVE
            </span>
          )}
        </Box>
        {title && (
          <Text truncate priority="400">
            <b>{title}</b>
          </Text>
        )}
        {game && (
          <Text size="T200" priority="300" style={{ opacity: 0.65 }}>
            🎮 {game}
          </Text>
        )}
        {!game && description && (
          <Text size="T200" priority="300">
            <UrlPreviewDescription>{description}</UrlPreviewDescription>
          </Text>
        )}
      </UrlPreviewContent>
    </>
  );
}

// ---------------------------------------------------------------------------
// Card 5: Reddit
// ---------------------------------------------------------------------------

function RedditCard({
  url,
  prev,
  mx,
  useAuthentication,
}: {
  url: string;
  prev: IPreviewUrlResponse;
  mx: ReturnType<typeof useMatrixClient>;
  useAuthentication: boolean;
}) {
  const title = (prev['og:title'] as string | undefined) ?? '';
  const description = (prev['og:description'] as string | undefined) ?? '';
  const mxcImage = prev['og:image'] as string | undefined;

  const { subreddit, isPost, isUser } = getRedditInfo(url);
  const { author, upvotes, comments } = parseRedditMeta(description);

  // Only render post thumbnail if we have a real image
  const thumbSrc =
    mxcImage && isPost
      ? mxcUrlToHttp(mx, mxcImage, useAuthentication, 160, 120, 'scale', false)
      : null;

  // Text preview: strip "Posted by u/..." metadata prefix
  const textPreview = description
    .replace(/Posted\s+by\s+u\/\S+\s*[·•]?\s*/i, '')
    .replace(/\s*\d+[\d,.]*(k|M)?\s+(points?|upvotes?)\s*[·•]?\s*/gi, '')
    .replace(/\s*\d+[\d,.]*(k|M)?\s+comments?\s*/gi, '')
    .trim();

  if (isUser) {
    // Simple user card
    return (
      <>
        <Box
          shrink="No"
          alignItems="Center"
          justifyContent="Center"
          className={previewCss.IconWrapper}
        >
          <svg
            width={28}
            height={28}
            viewBox="0 0 24 24"
            fill="#ff4500"
            aria-hidden="true"
            role="img"
          >
            <circle cx="12" cy="12" r="12" fill="#ff4500" />
            <path
              fill="#ffffff"
              d="M20 12a2 2 0 0 0-2-2 2 2 0 0 0-1.36.54C15.28 9.8 13.72 9.4 12 9.39l.7-3.26 2.23.47a1.4 1.4 0 1 0 .15-.69l-2.5-.52a.25.25 0 0 0-.29.19l-.78 3.65c-1.74.06-3.3.46-4.63 1.17A2 2 0 0 0 4 12a2 2 0 0 0 1.07 1.76 3.5 3.5 0 0 0 0 .49C5.07 16.69 8.27 19 12.07 19s6.97-2.31 6.97-4.75a3.5 3.5 0 0 0 0-.47A2 2 0 0 0 20 12zm-13 2a1 1 0 1 1 2 0 1 1 0 0 1-2 0zm5.59 2.71c-.72.72-2.1.77-2.53.77s-1.82-.05-2.53-.77a.25.25 0 0 1 .35-.35c.46.46 1.48.62 2.18.62s1.72-.16 2.18-.62a.25.25 0 0 1 .35.35zm-.15-1.71a1 1 0 1 1 2 0 1 1 0 0 1-2 0z"
            />
          </svg>
        </Box>
        <UrlPreviewContent>
          <Text
            style={linkStyles}
            truncate
            as="a"
            href={url}
            target="_blank"
            rel="noreferrer"
            size="T200"
            priority="300"
          >
            <SiteBadge label="Reddit" colorClass={previewCss.BadgeReddit} />
          </Text>
          {title && (
            <Text truncate priority="400">
              <b>{title}</b>
            </Text>
          )}
          {description && (
            <Text size="T200" priority="300">
              <UrlPreviewDescription>{description}</UrlPreviewDescription>
            </Text>
          )}
        </UrlPreviewContent>
      </>
    );
  }

  return (
    <Box direction="Column" style={{ width: '100%' }}>
      {/* Meta header */}
      <Box
        alignItems="Center"
        gap="100"
        style={{
          padding: `${config.space.S100} ${config.space.S200}`,
          paddingTop: config.space.S200,
          flexWrap: 'wrap',
        }}
      >
        {subreddit && <span className={previewCss.RedditSubBadge}>r/{subreddit}</span>}
        {author && (
          <Text size="T200" priority="300" style={{ opacity: 0.65 }}>
            · Posted by u/{author}
          </Text>
        )}
      </Box>

      {/* Main content row */}
      <div className={previewCss.RedditPostLayout}>
        <Box grow="Yes" direction="Column" gap="100">
          {title && (
            <Text
              priority="400"
              style={{
                fontWeight: 700,
                display: '-webkit-box',
                WebkitLineClamp: 3,
                WebkitBoxOrient: 'vertical',
                overflow: 'hidden',
              }}
            >
              {title}
            </Text>
          )}
          {textPreview && textPreview !== title && (
            <Text size="T200" priority="300" style={{ opacity: 0.7 }}>
              <UrlPreviewDescription>{textPreview}</UrlPreviewDescription>
            </Text>
          )}
          {/* Stats row */}
          <div className={previewCss.RedditMeta}>
            {upvotes && <span className={previewCss.RedditUpvote}>▲ {upvotes}</span>}
            {comments && <span>💬 {comments}</span>}
          </div>
        </Box>

        {thumbSrc && (
          <img className={previewCss.RedditThumb} src={thumbSrc} alt={title} loading="lazy" />
        )}
      </div>
    </Box>
  );
}

// ---------------------------------------------------------------------------
// Remaining card variants (unchanged from original)
// ---------------------------------------------------------------------------

function YouTubeCard({ url, prev }: { url: string; prev: IPreviewUrlResponse }) {
  const videoId = getYouTubeVideoId(url)!;
  const thumbnailSrc = `https://img.youtube.com/vi/${videoId}/mqdefault.jpg`;

  return (
    <VideoCard
      url={url}
      prev={prev}
      thumbnailUrl={thumbnailSrc}
      siteBadgeLabel="YouTube"
      siteBadgeClass=""
    />
  );
}

function VimeoCard({ url, prev }: { url: string; prev: IPreviewUrlResponse }) {
  // Vimeo always includes og:image for video thumbnails
  const thumbnailSrc = (prev['og:image'] as string | undefined) ?? '';

  return (
    <VideoCard
      url={url}
      prev={prev}
      thumbnailUrl={thumbnailSrc}
      siteBadgeLabel="Vimeo"
      siteBadgeClass={previewCss.BadgeVimeo}
    />
  );
}

function GitHubCard({ url, prev }: { url: string; prev: IPreviewUrlResponse }) {
  const title = prev['og:title'] ?? '';
  const description = prev['og:description'] ?? '';

  // GitHub og:title is usually "owner/repo: short description" — split on ': '
  const colonIdx = title.indexOf(': ');
  const repoName = colonIdx !== -1 ? title.slice(0, colonIdx) : title;
  const repoDesc = colonIdx !== -1 ? title.slice(colonIdx + 2) : description;

  return (
    <>
      <Box
        shrink="No"
        alignItems="Center"
        justifyContent="Center"
        className={previewCss.GitHubIconWrapper}
      >
        <GitHubIcon size={28} />
      </Box>
      <UrlPreviewContent>
        <Text
          style={linkStyles}
          truncate
          as="a"
          href={url}
          target="_blank"
          rel="noreferrer"
          size="T200"
          priority="300"
        >
          GitHub
        </Text>
        {repoName && (
          <Text truncate priority="400">
            <b>{repoName}</b>
          </Text>
        )}
        {repoDesc && (
          <Text size="T200" priority="300">
            <UrlPreviewDescription>{repoDesc}</UrlPreviewDescription>
          </Text>
        )}
        {description && description !== repoDesc && (
          <Text size="T200" priority="300">
            <UrlPreviewDescription>{description}</UrlPreviewDescription>
          </Text>
        )}
      </UrlPreviewContent>
    </>
  );
}

function SpotifyCard({ url, prev }: { url: string; prev: IPreviewUrlResponse }) {
  const title = prev['og:title'] ?? '';
  const description = prev['og:description'] ?? '';
  const artworkUrl = (prev['og:image'] as string | undefined) ?? '';
  const spotifyType = getSpotifyType(url) ?? 'track';
  const typeLabel = spotifyType.charAt(0).toUpperCase() + spotifyType.slice(1);

  return (
    <>
      {artworkUrl ? (
        <img className={previewCss.ArtworkThumbnail} src={artworkUrl} alt={title} loading="lazy" />
      ) : (
        <Box
          shrink="No"
          alignItems="Center"
          justifyContent="Center"
          className={previewCss.IconWrapper}
        >
          <span style={{ fontSize: '2rem', color: '#1db954' }}>♫</span>
        </Box>
      )}
      <UrlPreviewContent>
        <Text
          style={linkStyles}
          truncate
          as="a"
          href={url}
          target="_blank"
          rel="noreferrer"
          size="T200"
          priority="300"
        >
          <SiteBadge label={`Spotify ${typeLabel}`} colorClass={previewCss.BadgeSpotify} />
        </Text>
        {title && (
          <Text truncate priority="400">
            <b>{title}</b>
          </Text>
        )}
        {description && (
          <Text size="T200" priority="300">
            <UrlPreviewDescription>{description}</UrlPreviewDescription>
          </Text>
        )}
      </UrlPreviewContent>
    </>
  );
}

function SteamCard({ url, prev }: { url: string; prev: IPreviewUrlResponse }) {
  const title = prev['og:title'] ?? '';
  const description = prev['og:description'] ?? '';
  const thumbnailUrl = (prev['og:image'] as string | undefined) ?? '';

  return (
    <>
      {thumbnailUrl ? (
        <a
          href={url}
          target="_blank"
          rel="noreferrer"
          className={previewCss.MediaThumbnailWrapper}
          aria-label={`View on Steam: ${title}`}
        >
          <img
            className={previewCss.MediaThumbnailImg}
            src={thumbnailUrl}
            alt={title}
            loading="lazy"
          />
        </a>
      ) : (
        <Box
          shrink="No"
          alignItems="Center"
          justifyContent="Center"
          className={previewCss.IconWrapper}
        >
          <span style={{ fontSize: '1.5rem', color: '#c7d5e0' }}>⚙</span>
        </Box>
      )}
      <UrlPreviewContent>
        <Text
          style={linkStyles}
          truncate
          as="a"
          href={url}
          target="_blank"
          rel="noreferrer"
          size="T200"
          priority="300"
        >
          <SiteBadge label="Steam" colorClass={previewCss.BadgeSteam} />
        </Text>
        {title && (
          <Text truncate priority="400">
            <b>{title}</b>
          </Text>
        )}
        {description && (
          <Text size="T200" priority="300">
            <UrlPreviewDescription>{description}</UrlPreviewDescription>
          </Text>
        )}
      </UrlPreviewContent>
    </>
  );
}

function WikipediaCard({ url, prev }: { url: string; prev: IPreviewUrlResponse }) {
  const title = prev['og:title'] ?? '';
  const rawDescription = prev['og:description'] ?? '';
  const description =
    rawDescription.length > 200 ? `${rawDescription.slice(0, 200)}…` : rawDescription;

  return (
    <>
      <Box
        shrink="No"
        alignItems="Center"
        justifyContent="Center"
        className={previewCss.IconWrapper}
      >
        {/* Wikipedia "W" mark */}
        <svg
          width={32}
          height={32}
          viewBox="0 0 50 50"
          fill="currentColor"
          aria-hidden="true"
          role="img"
        >
          <path d="M26.5 4a1 1 0 0 0-1 1v.1c-2.1.3-4 1.4-5.3 3.1L12 22.5 5.9 8.7A1 1 0 0 0 5 8H2a1 1 0 1 0 0 2h2.3l7.2 16.9c.2.4.6.7 1 .7h.1c.5 0 .9-.3 1.1-.7l7.1-14.2c.9-1.7 2.4-2.9 4.2-3.4v28.4c-1.3.3-2.5 1-3.4 2H10.5a1 1 0 1 0 0 2h10.6C22 43 23.9 44 26 44h-.5a1 1 0 1 0 0 2H26a9 9 0 0 0 8.9-7.8H45a1 1 0 1 0 0-2H35c-.9-1-2.1-1.7-3.5-2V9.8c1.8.4 3.3 1.7 4.2 3.4l7.1 14.2c.2.4.6.7 1.1.7h.1c.4 0 .8-.3 1-.7L52.7 10H55a1 1 0 1 0 0-2h-3a1 1 0 0 0-.9.7L44 22.5l-8.2-14.3C34.5 5.4 32.6 4.3 30.5 4H27a1 1 0 0 0-.5 0z" />
        </svg>
      </Box>
      <UrlPreviewContent>
        <Text
          style={linkStyles}
          truncate
          as="a"
          href={url}
          target="_blank"
          rel="noreferrer"
          size="T200"
          priority="300"
        >
          <SiteBadge label="Wikipedia" colorClass={previewCss.BadgeWikipedia} />
        </Text>
        {title && (
          <Text truncate priority="400">
            <b>{title}</b>
          </Text>
        )}
        {description && (
          <Text size="T200" priority="300">
            <UrlPreviewDescription>{description}</UrlPreviewDescription>
          </Text>
        )}
      </UrlPreviewContent>
    </>
  );
}

function DiscordCard({ url, prev }: { url: string; prev: IPreviewUrlResponse }) {
  const title = prev['og:title'] ?? '';
  const description = prev['og:description'] ?? '';
  const iconUrl = (prev['og:image'] as string | undefined) ?? '';

  return (
    <>
      {iconUrl ? (
        <img className={previewCss.ArtworkThumbnail} src={iconUrl} alt={title} loading="lazy" />
      ) : (
        <Box
          shrink="No"
          alignItems="Center"
          justifyContent="Center"
          className={previewCss.IconWrapper}
        >
          {/* Discord logo (simple geometric mark) */}
          <svg
            width={28}
            height={28}
            viewBox="0 0 24 24"
            fill="#5865f2"
            aria-hidden="true"
            role="img"
          >
            <path d="M20.317 4.37a19.791 19.791 0 0 0-4.885-1.515.074.074 0 0 0-.079.037c-.21.375-.444.864-.608 1.25a18.27 18.27 0 0 0-5.487 0 12.64 12.64 0 0 0-.617-1.25.077.077 0 0 0-.079-.037A19.736 19.736 0 0 0 3.677 4.37a.07.07 0 0 0-.032.027C.533 9.046-.32 13.58.099 18.057a.082.082 0 0 0 .031.057 19.9 19.9 0 0 0 5.993 3.03.078.078 0 0 0 .084-.028c.462-.63.874-1.295 1.226-1.994a.076.076 0 0 0-.041-.106 13.107 13.107 0 0 1-1.872-.892.077.077 0 0 1-.008-.128 10.2 10.2 0 0 0 .372-.292.074.074 0 0 1 .077-.01c3.928 1.793 8.18 1.793 12.062 0a.074.074 0 0 1 .078.01c.12.098.246.198.373.292a.077.077 0 0 1-.006.127 12.299 12.299 0 0 1-1.873.892.077.077 0 0 0-.041.107c.36.698.772 1.362 1.225 1.993a.076.076 0 0 0 .084.028 19.839 19.839 0 0 0 6.002-3.03.077.077 0 0 0 .032-.054c.5-5.177-.838-9.674-3.549-13.66a.061.061 0 0 0-.031-.03zM8.02 15.33c-1.183 0-2.157-1.085-2.157-2.419 0-1.333.956-2.419 2.157-2.419 1.21 0 2.176 1.096 2.157 2.42 0 1.333-.956 2.418-2.157 2.418zm7.975 0c-1.183 0-2.157-1.085-2.157-2.419 0-1.333.955-2.419 2.157-2.419 1.21 0 2.176 1.096 2.157 2.42 0 1.333-.946 2.418-2.157 2.418z" />
          </svg>
        </Box>
      )}
      <UrlPreviewContent>
        <Text
          style={linkStyles}
          truncate
          as="a"
          href={url}
          target="_blank"
          rel="noreferrer"
          size="T200"
          priority="300"
        >
          <SiteBadge label="Discord" colorClass={previewCss.BadgeDiscord} />
          <span style={{ marginLeft: '6px', opacity: 0.7, fontSize: '0.85em' }}>Join Server</span>
        </Text>
        {title && (
          <Text truncate priority="400">
            <b>{title}</b>
          </Text>
        )}
        {description && (
          <Text size="T200" priority="300">
            <UrlPreviewDescription>{description}</UrlPreviewDescription>
          </Text>
        )}
      </UrlPreviewContent>
    </>
  );
}

function NpmCard({ url, prev }: { url: string; prev: IPreviewUrlResponse }) {
  const title = prev['og:title'] ?? '';
  const description = prev['og:description'] ?? '';

  return (
    <>
      <Box
        shrink="No"
        alignItems="Center"
        justifyContent="Center"
        className={previewCss.IconWrapper}
      >
        {/* npm logo — simple square mark */}
        <svg width={32} height={32} viewBox="0 0 18 7" fill="none" aria-hidden="true" role="img">
          <rect width="18" height="7" fill="#cb3837" />
          <rect x="1" y="1" width="4" height="5" fill="white" />
          <rect x="2" y="1" width="1" height="4" fill="#cb3837" />
          <rect x="6" y="1" width="4" height="5" fill="white" />
          <rect x="7" y="1" width="1" height="3" fill="#cb3837" />
          <rect x="11" y="1" width="4" height="4" fill="white" />
          <rect x="12" y="1" width="1" height="3" fill="#cb3837" />
        </svg>
      </Box>
      <UrlPreviewContent>
        <Text
          style={linkStyles}
          truncate
          as="a"
          href={url}
          target="_blank"
          rel="noreferrer"
          size="T200"
          priority="300"
        >
          <SiteBadge label="npm" colorClass={previewCss.BadgeNpm} />
        </Text>
        {title && (
          <Text truncate priority="400">
            <b>{title}</b>
          </Text>
        )}
        {description && (
          <Text size="T200" priority="300">
            <UrlPreviewDescription>{description}</UrlPreviewDescription>
          </Text>
        )}
      </UrlPreviewContent>
    </>
  );
}

function StackOverflowCard({ url, prev }: { url: string; prev: IPreviewUrlResponse }) {
  const title = prev['og:title'] ?? '';
  const description = prev['og:description'] ?? '';

  return (
    <>
      <Box
        shrink="No"
        alignItems="Center"
        justifyContent="Center"
        className={previewCss.IconWrapper}
      >
        {/* Stack Overflow logo — simplified stack of bars */}
        <svg
          width={28}
          height={28}
          viewBox="0 0 24 24"
          fill="#f48024"
          aria-hidden="true"
          role="img"
        >
          <path d="M18.986 21.865v-6.404h2.134V24H0v-8.539h2.134v6.404zM3.34 13.232l.415-2.396 9.913 1.73-.415 2.396zm1.241-4.065.832-2.26 9.308 3.424-.832 2.26-9.308-3.424zm2.498-3.993 1.248-2.097 8.17 4.857-1.248 2.097L7.079 5.174zm4.568-3.741 1.665-1.665 6.971 6.971-1.665 1.665-6.971-6.97zm7.559 11.866h-2.134V6.796h2.134z" />
        </svg>
      </Box>
      <UrlPreviewContent>
        <Text
          style={linkStyles}
          truncate
          as="a"
          href={url}
          target="_blank"
          rel="noreferrer"
          size="T200"
          priority="300"
        >
          <SiteBadge label="Stack Overflow" colorClass={previewCss.BadgeStackOverflow} />
        </Text>
        {title && (
          <Text truncate priority="400">
            <b>{title}</b>
          </Text>
        )}
        {description && (
          <Text size="T200" priority="300">
            <UrlPreviewDescription>{description}</UrlPreviewDescription>
          </Text>
        )}
      </UrlPreviewContent>
    </>
  );
}

function ImdbCard({ url, prev }: { url: string; prev: IPreviewUrlResponse }) {
  const title = prev['og:title'] ?? '';
  const description = prev['og:description'] ?? '';
  const posterUrl = (prev['og:image'] as string | undefined) ?? '';

  return (
    <>
      {posterUrl ? (
        <img className={previewCss.PosterThumbnail} src={posterUrl} alt={title} loading="lazy" />
      ) : (
        <Box
          shrink="No"
          alignItems="Center"
          justifyContent="Center"
          className={previewCss.IconWrapper}
        >
          <SiteBadge label="IMDb" colorClass={previewCss.BadgeImdb} />
        </Box>
      )}
      <UrlPreviewContent>
        <Text
          style={linkStyles}
          truncate
          as="a"
          href={url}
          target="_blank"
          rel="noreferrer"
          size="T200"
          priority="300"
        >
          <SiteBadge label="IMDb" colorClass={previewCss.BadgeImdb} />
        </Text>
        {title && (
          <Text truncate priority="400">
            <b>{title}</b>
          </Text>
        )}
        {description && (
          <Text size="T200" priority="300">
            <UrlPreviewDescription>{description}</UrlPreviewDescription>
          </Text>
        )}
      </UrlPreviewContent>
    </>
  );
}

// ---------------------------------------------------------------------------
// Card: GIF (Giphy / Tenor)
// ---------------------------------------------------------------------------

function GifCard({
  url,
  prev,
  mx,
  useAuthentication,
  siteBadgeLabel,
  siteBadgeClass,
}: {
  url: string;
  prev: IPreviewUrlResponse;
  mx: ReturnType<typeof useMatrixClient>;
  useAuthentication: boolean;
  siteBadgeLabel: string;
  siteBadgeClass: string;
}) {
  const title = (prev['og:title'] as string | undefined) ?? '';
  const mxcImage = prev['og:image'] as string | undefined;

  const thumbSrc = mxcImage
    ? mxcUrlToHttp(mx, mxcImage, useAuthentication, 400, 200, 'scale', false)
    : null;

  // If there's no image, fall back to a generic-style layout
  if (!thumbSrc) {
    return (
      <>
        <UrlPreviewContent>
          <Text
            style={linkStyles}
            truncate
            as="a"
            href={url}
            target="_blank"
            rel="noreferrer"
            size="T200"
            priority="300"
          >
            <SiteBadge label={siteBadgeLabel} colorClass={siteBadgeClass} />
          </Text>
          {title && (
            <Text truncate priority="400">
              <b>{title}</b>
            </Text>
          )}
        </UrlPreviewContent>
      </>
    );
  }

  return (
    <Box direction="Column" style={{ width: '100%' }}>
      {/* GIF thumbnail — full width */}
      <a
        href={url}
        target="_blank"
        rel="noreferrer"
        className={previewCss.GifThumbnailWrapper}
        aria-label={`View GIF on ${siteBadgeLabel}: ${title}`}
      >
        <img className={previewCss.GifThumbnailImg} src={thumbSrc} alt={title} loading="lazy" />
        <span className={previewCss.GifBadge}>GIF</span>
      </a>
      {/* Footer row */}
      <UrlPreviewContent>
        <Box alignItems="Center" gap="100" wrap="Wrap">
          <SiteBadge label={siteBadgeLabel} colorClass={siteBadgeClass} />
          {title && (
            <Text truncate priority="400" style={{ fontWeight: 600 }}>
              {title}
            </Text>
          )}
        </Box>
      </UrlPreviewContent>
    </Box>
  );
}

function GenericCard({
  url,
  prev,
  onOpenViewer,
  viewer,
  onCloseViewer,
  thumbUrl,
  imgUrl,
}: {
  url: string;
  prev: IPreviewUrlResponse;
  onOpenViewer: () => void;
  viewer: boolean;
  onCloseViewer: () => void;
  thumbUrl: string | null;
  imgUrl: string | null;
}) {
  const title = prev['og:title'] ?? '';
  const description = prev['og:description'] ?? '';
  const siteName = typeof prev['og:site_name'] === 'string' ? prev['og:site_name'] : undefined;
  const domain = getDomain(url);
  const faviconSrc = `https://www.google.com/s2/favicons?domain=${encodeURIComponent(domain)}&sz=16`;

  return (
    <>
      {thumbUrl && (
        <UrlPreviewImg
          src={thumbUrl}
          alt={prev['og:title']}
          title={prev['og:title']}
          tabIndex={0}
          onKeyDown={(evt) => onEnterOrSpace(() => onOpenViewer())(evt)}
          onClick={onOpenViewer}
        />
      )}
      {imgUrl && (
        <ImageOverlay
          src={imgUrl}
          alt={prev['og:title']}
          viewer={viewer}
          requestClose={onCloseViewer}
          renderViewer={(p) => <ImageViewer {...p} />}
        />
      )}
      <UrlPreviewContent>
        <Text
          style={linkStyles}
          truncate
          as="a"
          href={url}
          target="_blank"
          rel="noreferrer"
          size="T200"
          priority="300"
        >
          {!thumbUrl && (
            <img
              className={previewCss.GenericFaviconImg}
              src={faviconSrc}
              alt=""
              aria-hidden="true"
              loading="lazy"
              style={{ marginRight: '4px', verticalAlign: 'text-bottom' }}
            />
          )}
          {siteName ? `${siteName} | ` : ''}
          {tryDecodeURIComponent(url)}
        </Text>
        {title && (
          <Text truncate priority="400">
            <b>{title}</b>
          </Text>
        )}
        {description && (
          <Text size="T200" priority="300">
            <UrlPreviewDescription>{description}</UrlPreviewDescription>
          </Text>
        )}
      </UrlPreviewContent>
    </>
  );
}

// ---------------------------------------------------------------------------
// Main UrlPreviewCard component
// ---------------------------------------------------------------------------

export const UrlPreviewCard = as<'div', { url: string; ts: number }>(
  ({ url, ts, ...props }, ref) => {
    const mx = useMatrixClient();
    const useAuthentication = useMediaAuthentication();
    const [viewer, setViewer] = useState(false);
    const [previewStatus, loadPreview] = useAsyncCallback(
      useCallback(() => mx.getUrlPreview(url, ts), [url, ts, mx]),
    );

    useEffect(() => {
      loadPreview().catch(() => {});
    }, [loadPreview]);

    if (previewStatus.status === AsyncStatus.Error) return null;

    const renderContent = (prev: IPreviewUrlResponse): React.ReactNode => {
      const variant = getCardVariant(url);

      switch (variant) {
        case 'youtube-shorts':
          return <YouTubeShortsCard url={url} prev={prev} />;
        case 'youtube':
          return <YouTubeCard url={url} prev={prev} />;
        case 'tiktok':
          return <TikTokCard url={url} prev={prev} mx={mx} useAuthentication={useAuthentication} />;
        case 'vimeo':
          return <VimeoCard url={url} prev={prev} />;
        case 'github':
          return <GitHubCard url={url} prev={prev} />;
        case 'twitter':
          return (
            <TwitterCard url={url} prev={prev} mx={mx} useAuthentication={useAuthentication} />
          );
        case 'reddit':
          return <RedditCard url={url} prev={prev} mx={mx} useAuthentication={useAuthentication} />;
        case 'spotify':
          return <SpotifyCard url={url} prev={prev} />;
        case 'twitch':
          return <TwitchCard url={url} prev={prev} mx={mx} useAuthentication={useAuthentication} />;
        case 'steam':
          return <SteamCard url={url} prev={prev} />;
        case 'wikipedia':
          return <WikipediaCard url={url} prev={prev} />;
        case 'discord':
          return <DiscordCard url={url} prev={prev} />;
        case 'npm':
          return <NpmCard url={url} prev={prev} />;
        case 'stackoverflow':
          return <StackOverflowCard url={url} prev={prev} />;
        case 'imdb':
          return <ImdbCard url={url} prev={prev} />;
        case 'giphy':
          return (
            <GifCard
              url={url}
              prev={prev}
              mx={mx}
              useAuthentication={useAuthentication}
              siteBadgeLabel="Giphy"
              siteBadgeClass={previewCss.BadgeGiphy}
            />
          );
        case 'tenor':
          return (
            <GifCard
              url={url}
              prev={prev}
              mx={mx}
              useAuthentication={useAuthentication}
              siteBadgeLabel="Tenor"
              siteBadgeClass={previewCss.BadgeTenor}
            />
          );
        default: {
          // Generic fallback — skip empty cards
          if (!prev['og:title'] && !prev['og:description']) return null;

          const thumbUrl = mxcUrlToHttp(
            mx,
            prev['og:image'] || '',
            useAuthentication,
            256,
            256,
            'scale',
            false,
          );
          const imgUrl = mxcUrlToHttp(mx, prev['og:image'] || '', useAuthentication);

          return (
            <GenericCard
              url={url}
              prev={prev}
              onOpenViewer={() => setViewer(true)}
              viewer={viewer}
              onCloseViewer={() => setViewer(false)}
              thumbUrl={thumbUrl}
              imgUrl={imgUrl}
            />
          );
        }
      }
    };

    // Don't render the card wrapper when content is empty (loaded but nothing to show)
    if (previewStatus.status === AsyncStatus.Success) {
      const content = renderContent(previewStatus.data);
      if (content === null) return null;
      return (
        <UrlPreview {...props} ref={ref}>
          {content}
        </UrlPreview>
      );
    }

    return (
      <UrlPreview {...props} ref={ref}>
        <Box grow="Yes" alignItems="Center" justifyContent="Center">
          <Spinner variant="Secondary" size="400" />
        </Box>
      </UrlPreview>
    );
  },
);

export const UrlPreviewHolder = as<'div'>(({ children, ...props }, ref) => {
  const scrollRef = useRef<HTMLDivElement>(null);
  const backAnchorRef = useRef<HTMLDivElement>(null);
  const frontAnchorRef = useRef<HTMLDivElement>(null);
  const [backVisible, setBackVisible] = useState(true);
  const [frontVisible, setFrontVisible] = useState(true);

  const intersectionObserver = useIntersectionObserver(
    useCallback((entries) => {
      const backAnchor = backAnchorRef.current;
      const frontAnchor = frontAnchorRef.current;
      const backEntry = backAnchor && getIntersectionObserverEntry(backAnchor, entries);
      const frontEntry = frontAnchor && getIntersectionObserverEntry(frontAnchor, entries);
      if (backEntry) {
        setBackVisible(backEntry.isIntersecting);
      }
      if (frontEntry) {
        setFrontVisible(frontEntry.isIntersecting);
      }
    }, []),
    useCallback(
      () => ({
        root: scrollRef.current,
        rootMargin: '10px',
      }),
      [],
    ),
  );

  useEffect(() => {
    const backAnchor = backAnchorRef.current;
    const frontAnchor = frontAnchorRef.current;
    if (backAnchor) intersectionObserver?.observe(backAnchor);
    if (frontAnchor) intersectionObserver?.observe(frontAnchor);
    return () => {
      if (backAnchor) intersectionObserver?.unobserve(backAnchor);
      if (frontAnchor) intersectionObserver?.unobserve(frontAnchor);
    };
  }, [intersectionObserver]);

  const handleScrollBack = () => {
    const scroll = scrollRef.current;
    if (!scroll) return;
    const { offsetWidth, scrollLeft } = scroll;
    scroll.scrollTo({
      left: scrollLeft - offsetWidth / 1.3,
      behavior: 'smooth',
    });
  };
  const handleScrollFront = () => {
    const scroll = scrollRef.current;
    if (!scroll) return;
    const { offsetWidth, scrollLeft } = scroll;
    scroll.scrollTo({
      left: scrollLeft + offsetWidth / 1.3,
      behavior: 'smooth',
    });
  };

  return (
    <Box
      direction="Column"
      {...props}
      ref={ref}
      style={{ marginTop: config.space.S200, position: 'relative' }}
    >
      <Scroll ref={scrollRef} direction="Horizontal" size="0" visibility="Hover" hideTrack>
        <Box shrink="No" alignItems="Center">
          <div ref={backAnchorRef} />
          {!backVisible && (
            <>
              <div className={css.UrlPreviewHolderGradient({ position: 'Left' })} />
              <IconButton
                className={css.UrlPreviewHolderBtn({ position: 'Left' })}
                aria-label="Previous preview"
                variant="Secondary"
                radii="Pill"
                size="300"
                outlined
                onClick={handleScrollBack}
              >
                <Icon size="300" src={Icons.ArrowLeft} />
              </IconButton>
            </>
          )}
          <Box alignItems="Inherit" gap="200">
            {children}

            {!frontVisible && (
              <>
                <div className={css.UrlPreviewHolderGradient({ position: 'Right' })} />
                <IconButton
                  className={css.UrlPreviewHolderBtn({ position: 'Right' })}
                  aria-label="Next preview"
                  variant="Primary"
                  radii="Pill"
                  size="300"
                  outlined
                  onClick={handleScrollFront}
                >
                  <Icon size="300" src={Icons.ArrowRight} />
                </IconButton>
              </>
            )}
            <div ref={frontAnchorRef} />
          </Box>
        </Box>
      </Scroll>
    </Box>
  );
});