function escapeHtml(unsafe) {
    return unsafe
      .replace(/&/g, "&")
      .replace(/</g, "&lt;")
      .replace(/>/g, "&gt;")
      .replace(/"/g, "&quot;")
      .replace(/'/g, "&#039;");
  }

  function toot_active(toot, what) {
    var count = toot[what+'_count'];
    return count > 0 ? 'active' : '';
  }

  function toot_count(toot, what) {
    var count = toot[what+'_count'];
    return count > 0 ? count : '';
  }

  function user_account(account) {
    var result =`@${account.acct}`;
    if (account.acct.indexOf('@') === -1) {
      var domain = new URL(account.url)
      result += `@${domain.hostname}`
    }
    return result;
  }

  function render_toots(toots, in_reply_to, depth) {
    var tootsToRender = toots
      .filter(toot => toot.in_reply_to_id === in_reply_to)
      .sort((a, b) => a.created_at.localeCompare(b.created_at));
    tootsToRender.forEach(toot => render_toot(toots, toot, depth));
  }

  function render_toot(toots, toot, depth) {
    toot.account.display_name = escapeHtml(toot.account.display_name);
    toot.account.emojis.forEach(emoji => {
      toot.account.display_name = toot.account.display_name.replace(`:${emoji.shortcode}:`, `<img src="${escapeHtml(emoji.static_url)}" alt="Emoji ${emoji.shortcode}" height="20" width="20" />`);
    });
    if (!blockedToots.includes(toot.url)) {
      mastodonComment =
        `<div class="mastodon-comment" style="margin-left: calc(var(--mastodon-comment-indent) * ${depth})">
          <div class="author">
            <div class="avatar">
              <img src="${escapeHtml(toot.account.avatar_static)}" height=60 width=60 alt="">
            </div>
            <div class="details">
              <a class="name" href="${toot.account.url}" rel="nofollow">${toot.account.display_name}</a>
              <a class="user" href="${toot.account.url}" rel="nofollow">${user_account(toot.account)}</a>
            </div>
            <a class="date" href="${toot.url}" rel="nofollow">${toot.created_at.substr(0, 10)} ${toot.created_at.substr(11, 8)}</a>
          </div>
          <div class="content">${toot.content}</div>
          <div class="attachments">
            ${toot.media_attachments.map(attachment => {
              if (attachment.type === 'image') {
                return `<a href="${attachment.url}" rel="nofollow"><img src="${attachment.preview_url}" alt="${attachment.description}" /></a>`;
              } else if (attachment.type === 'video') {
                return `<video controls><source src="${attachment.url}" type="${attachment.mime_type}"></video>`;
              } else if (attachment.type === 'gifv') {
                return `<video autoplay loop muted playsinline><source src="${attachment.url}" type="${attachment.mime_type}"></video>`;
              } else if (attachment.type === 'audio') {
                return `<audio controls><source src="${attachment.url}" type="${attachment.mime_type}"></audio>`;
              } else {
                return `<a href="${attachment.url}" rel="nofollow">${attachment.type}</a>`;
              }
            }).join('')}
          </div>
          <div class="status">
            <div class="replies ${toot_active(toot, 'replies')}">
              <a href="${toot.url}" rel="nofollow"><i class="fa fa-reply fa-fw"></i>${toot_count(toot, 'replies')}</a>
            </div>
            <div class="reblogs ${toot_active(toot, 'reblogs')}">
              <a href="${toot.url}" rel="nofollow"><i class="fa fa-retweet fa-fw"></i>${toot_count(toot, 'reblogs')}</a>
            </div>
            <div class="favourites ${toot_active(toot, 'favourites')}">
              <a href="${toot.url}" rel="nofollow"><i class="fa fa-star fa-fw"></i>${toot_count(toot, 'favourites')}</a>
            </div>
          </div>
        </div>`;
      document.getElementById('mastodon-comments-list').appendChild(DOMPurify.sanitize(mastodonComment, {'RETURN_DOM_FRAGMENT': true}));
    }

    render_toots(toots, toot.id, depth + 1)
  }

  function loadComments() {
    if (commentsLoaded) return;

    document.getElementById("mastodon-comments-list").innerHTML = "Loading comments from the Fediverse...";

    console.log('Comment URL: https://' + host + '/api/v1/statuses/' + id + '/context');
    fetch('https://' + host + '/api/v1/statuses/' + id + '/context')
      .then(function(response) {
        return response.json();
      })
      .then(function(data) {
        if(data['descendants'] && Array.isArray(data['descendants']) && data['descendants'].length > 0) {
            document.getElementById('mastodon-comments-list').innerHTML = "";
            render_toots(data['descendants'], id, 0)
        } else {
          document.getElementById('mastodon-comments-list').innerHTML = "<p>No comments found</p>";
        }

        commentsLoaded = true;
      });
  }

  function respondToVisibility(element, callback) {
    var options = {
      root: null,
    };

    var observer = new IntersectionObserver((entries, observer) => {
      entries.forEach(entry => {
        if (entry.intersectionRatio > 0) {
          callback();
        }
      });
    }, options);

    observer.observe(element);
  }