import styles from './embed.module.css';

interface EmbedProps {
  url: string;
}

const Embed = ({ url }: EmbedProps) => {
  const parsedUrl = new URL(url);

  if (youtubeHosts.has(parsedUrl.host) || (parsedUrl.host.startsWith('yt.') && parsedUrl.searchParams.has('v'))) {
    return <YoutubeEmbed parsedUrl={parsedUrl} />;
  }
  if (xHosts.has(parsedUrl.host)) {
    return <XEmbed parsedUrl={parsedUrl} />;
  }
  if (redditHosts.has(parsedUrl.host)) {
    return <RedditEmbed parsedUrl={parsedUrl} />;
  }
  if (twitchHosts.has(parsedUrl.host)) {
    return <TwitchEmbed parsedUrl={parsedUrl} />;
  }
  if (tiktokHosts.has(parsedUrl.host)) {
    return <TiktokEmbed parsedUrl={parsedUrl} />;
  }
  if (instagramHosts.has(parsedUrl.host)) {
    return <InstagramEmbed parsedUrl={parsedUrl} />;
  }
  if (odyseeHosts.has(parsedUrl.host)) {
    return <OdyseeEmbed parsedUrl={parsedUrl} />;
  }
  if (bitchuteHosts.has(parsedUrl.host)) {
    return <BitchuteEmbed parsedUrl={parsedUrl} />;
  }
  if (streamableHosts.has(parsedUrl.host)) {
    return <StreamableEmbed parsedUrl={parsedUrl} />;
  }
  if (spotifyHosts.has(parsedUrl.host)) {
    return <SpotifyEmbed parsedUrl={parsedUrl} />;
  }
  if (soundcloudHosts.has(parsedUrl.host)) {
    return <SoundcloudEmbed parsedUrl={parsedUrl} />;
  }
};

interface EmbedComponentProps {
  parsedUrl: URL;
}

const srcDocSandbox = 'allow-scripts allow-popups allow-popups-to-escape-sandbox';

const youtubeHosts = new Set<string>([
  'youtube.com',
  'www.youtube.com',
  'youtu.be',
  'www.youtu.be',
  'm.youtube.com',
  'music.youtube.com',
  // working Invidious instances - https://docs.invidious.io/instances/ - https://uptime.invidious.io/
  'yewtu.be',
  'inv.nadeko.net',
  'yt.artemislena.eu',
  'invidious.nerdvpn.de',
]);

const YoutubeEmbed = ({ parsedUrl }: EmbedComponentProps) => {
  let embedSrc = '';

  const isInvidious = parsedUrl.host !== 'youtube.com' && parsedUrl.host !== 'www.youtube.com' && parsedUrl.host !== 'youtu.be' && parsedUrl.host !== 'www.youtu.be';

  if (parsedUrl.searchParams.has('list')) {
    const playlistId = parsedUrl.searchParams.get('list');
    embedSrc = `https://www.youtube.com/embed/videoseries?list=${playlistId}`;
  } else {
    let videoId = parsedUrl.searchParams.get('v');

    if (!videoId) {
      if (parsedUrl.host.includes('youtu.be')) {
        videoId = parsedUrl.pathname.substring(1);
      } else if (parsedUrl.pathname.includes('/shorts/')) {
        videoId = parsedUrl.pathname.split('/shorts/')[1];
      } else if (isInvidious) {
        if (parsedUrl.pathname.startsWith('/watch')) {
          videoId = parsedUrl.searchParams.get('v');
        } else {
          videoId = parsedUrl.pathname.split('/').pop() || null;
        }
      }
    }

    if (videoId) {
      embedSrc = `https://www.youtube.com/embed/${videoId}`;
    }
  }
  if (embedSrc) {
    return (
      <iframe
        className={styles.videoEmbed}
        height='100%'
        width='100%'
        referrerPolicy='origin'
        allow='accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share'
        allowFullScreen
        title={parsedUrl.href}
        src={embedSrc}
      />
    );
  }
  return null;
};

const xHosts = new Set<string>(['twitter.com', 'www.twitter.com', 'x.com', 'www.x.com']);

const getXTweetId = (parsedUrl: URL): string | undefined => {
  const pathParts = parsedUrl.pathname.split('/').filter(Boolean);
  const statusIndex = pathParts.findIndex((part) => part === 'status' || part === 'statuses');
  const statusId = statusIndex === -1 ? undefined : pathParts[statusIndex + 1];

  return statusId && /^\d+$/.test(statusId) ? statusId : undefined;
};

const XEmbed = ({ parsedUrl }: EmbedComponentProps) => {
  const tweetId = getXTweetId(parsedUrl);
  if (!tweetId) {
    return null;
  }

  const searchParams = new URLSearchParams({
    id: tweetId,
    theme: 'dark',
    dnt: 'false',
    hideThread: 'false',
    hideCard: 'false',
    lang: 'en',
  });

  return (
    <iframe
      className={styles.xEmbed}
      height='100%'
      width='100%'
      referrerPolicy='no-referrer'
      allow='accelerometer; encrypted-media; gyroscope; picture-in-picture; web-share'
      sandbox={`${srcDocSandbox} allow-same-origin`}
      title={parsedUrl.href}
      src={`https://platform.twitter.com/embed/Tweet.html?${searchParams.toString()}`}
    />
  );
};

const redditHosts = new Set<string>(['reddit.com', 'www.reddit.com', 'old.reddit.com']);

const RedditEmbed = ({ parsedUrl }: EmbedComponentProps) => {
  return (
    <iframe
      className={styles.redditEmbed}
      height='100%'
      width='100%'
      referrerPolicy='no-referrer'
      allow='accelerometer; encrypted-media; gyroscope; picture-in-picture; web-share'
      sandbox={srcDocSandbox}
      title={parsedUrl.href}
      srcDoc={`
      <style>
        /* fix reddit iframe being centered */
        iframe {
          margin: 0!important;
        }
      </style>
      <blockquote class="reddit-embed-bq" style="height:240px" data-embed-theme="dark">
        <a href="${parsedUrl.href}"></a>    
      </blockquote>
      <script async src="https://embed.reddit.com/widgets.js" charset="UTF-8"></script>
    `}
    />
  );
};

const twitchHosts = new Set<string>(['twitch.tv', 'www.twitch.tv']);

const TwitchEmbed = ({ parsedUrl }: EmbedComponentProps) => {
  let iframeUrl;
  if (parsedUrl.pathname.startsWith('/videos/')) {
    const videoId = parsedUrl.pathname.replace('/videos/', '');
    iframeUrl = `https://player.twitch.tv/?video=${videoId}&parent=${window.location.hostname}`;
  } else {
    const channel = parsedUrl.pathname.replaceAll('/', '');
    iframeUrl = `https://player.twitch.tv/?channel=${channel}&parent=${window.location.hostname}`;
  }
  return (
    <iframe
      className={styles.videoEmbed}
      height='100%'
      width='100%'
      referrerPolicy='no-referrer'
      allow='accelerometer; encrypted-media; gyroscope; picture-in-picture; web-share'
      allowFullScreen
      title={parsedUrl.href}
      src={iframeUrl}
    />
  );
};

const tiktokHosts = new Set<string>(['tiktok.com', 'www.tiktok.com']);

const TiktokEmbed = ({ parsedUrl }: EmbedComponentProps) => {
  const videoId = parsedUrl.pathname.replace(/.+\/video\//, '').replaceAll('/', '');
  return (
    <iframe
      className={styles.tiktokEmbed}
      height='100%'
      width='100%'
      referrerPolicy='no-referrer'
      allow='accelerometer; encrypted-media; gyroscope; picture-in-picture; web-share'
      sandbox={srcDocSandbox}
      title={parsedUrl.href}
      srcDoc={`
      <blockquote class="tiktok-embed" data-video-id="${videoId}">
        <a></a>
      </blockquote> 
      <script async src="https://www.tiktok.com/embed.js"></script>
    `}
    />
  );
};

const instagramHosts = new Set<string>(['instagram.com', 'www.instagram.com']);

const InstagramEmbed = ({ parsedUrl }: EmbedComponentProps) => {
  const pathNames = parsedUrl.pathname.replace(/\/+$/, '').split('/');
  const id = pathNames[pathNames.length - 1];
  return (
    <iframe
      className={styles.instagramEmbed}
      height='100%'
      width='100%'
      referrerPolicy='no-referrer'
      allow='accelerometer; encrypted-media; gyroscope; picture-in-picture; web-share'
      title={parsedUrl.href}
      srcDoc={`
      <blockquote class="instagram-media">
        <a href="https://www.instagram.com/p/${id}/"></a>
      </blockquote>
      <script async src="https://www.instagram.com/embed.js"></script>
    `}
      sandbox={srcDocSandbox}
    />
  );
};

const odyseeHosts = new Set<string>(['odysee.com', 'www.odysee.com']);

const OdyseeEmbed = ({ parsedUrl }: EmbedComponentProps) => {
  const iframeUrl = `https://odysee.com/$/embed${parsedUrl.pathname}`;
  return (
    <iframe
      className={styles.videoEmbed}
      height='100%'
      width='100%'
      referrerPolicy='no-referrer'
      allow='accelerometer; encrypted-media; gyroscope; picture-in-picture; web-share'
      allowFullScreen
      title={parsedUrl.href}
      src={iframeUrl}
    />
  );
};

const bitchuteHosts = new Set<string>(['bitchute.com', 'www.bitchute.com']);

const BitchuteEmbed = ({ parsedUrl }: EmbedComponentProps) => {
  const videoId = parsedUrl.pathname.replace(/\/video\//, '').replaceAll('/', '');
  return (
    <iframe
      className={styles.videoEmbed}
      height='100%'
      width='100%'
      referrerPolicy='no-referrer'
      allow='accelerometer; encrypted-media; gyroscope; picture-in-picture; web-share'
      allowFullScreen
      title={parsedUrl.href}
      src={`https://www.bitchute.com/embed/${videoId}/`}
    />
  );
};

const streamableHosts = new Set<string>(['streamable.com', 'www.streamable.com']);

const StreamableEmbed = ({ parsedUrl }: EmbedComponentProps) => {
  const videoId = parsedUrl.pathname.replaceAll('/', '');
  return (
    <iframe
      className={styles.videoEmbed}
      height='100%'
      width='100%'
      referrerPolicy='no-referrer'
      allow='accelerometer; encrypted-media; gyroscope; picture-in-picture; web-share'
      allowFullScreen
      title={parsedUrl.href}
      src={`https://streamable.com/e/${videoId}`}
    />
  );
};

const spotifyHosts = new Set<string>(['spotify.com', 'www.spotify.com', 'open.spotify.com']);

const SpotifyEmbed = ({ parsedUrl }: EmbedComponentProps) => {
  const iframeUrl = `https://open.spotify.com/embed${parsedUrl.pathname}?theme=0`;
  return (
    <iframe
      className={styles.audioEmbed}
      height='100%'
      width='100%'
      referrerPolicy='no-referrer'
      allow='accelerometer; encrypted-media; gyroscope; picture-in-picture; web-share'
      allowFullScreen
      title={parsedUrl.href}
      src={iframeUrl}
    />
  );
};

const soundcloudHosts = new Set(['soundcloud.com', 'www.soundcloud.com', 'on.soundcloud.com', 'api.soundcloud.com', 'w.soundcloud.com']);

// not officially documented https://stackoverflow.com/questions/20870270/how-to-get-soundcloud-embed-code-by-soundcloud-com-url
const SoundcloudEmbed = ({ parsedUrl }: EmbedComponentProps) => {
  return (
    <iframe
      className={styles.soundcloudEmbed}
      height='100%'
      width='100%'
      referrerPolicy='no-referrer'
      allow='accelerometer; encrypted-media; gyroscope; picture-in-picture; web-share'
      allowFullScreen
      title={parsedUrl.href}
      src={`https://w.soundcloud.com/player/?url=${parsedUrl.href}`}
    />
  );
};

const canEmbedHosts = new Set<string>([
  ...youtubeHosts,
  ...xHosts,
  ...redditHosts,
  ...twitchHosts,
  ...tiktokHosts,
  ...instagramHosts,
  ...odyseeHosts,
  ...bitchuteHosts,
  ...soundcloudHosts,
  ...streamableHosts,
  ...spotifyHosts,
]);

export const canEmbed = (parsedUrl: URL): boolean => {
  if (xHosts.has(parsedUrl.host)) {
    return Boolean(getXTweetId(parsedUrl));
  }

  if (redditHosts.has(parsedUrl.host)) {
    // Reddit posts are not embeddable if the URL does not include '/comments/'
    return parsedUrl.pathname.includes('/comments/');
  }

  return canEmbedHosts.has(parsedUrl.host) || (parsedUrl.host.startsWith('yt.') && parsedUrl.searchParams.has('v'));
};

export default Embed;