export function createSidebarPageAiMarkdownRuntime(context) {
  const { escapeHtml } = context;

  function textFromUnknown(value) {
    if (value == null) return '';
    if (typeof value === 'string' || typeof value === 'number' || typeof value === 'boolean') return String(value);
    if (Array.isArray(value)) return value.map(textFromUnknown).filter(Boolean).join(' ');
    if (typeof value !== 'object') return '';
    var parts = [];
    ['text', 'title', 'content', 'children', 'blocks', 'body'].forEach(function(key) {
      if (Object.prototype.hasOwnProperty.call(value, key)) {
        var text = textFromUnknown(value[key]);
        if (text) parts.push(text);
      }
    });
    return parts.join(' ');
  }

  function renderPageAiMarkdownInline(text) {
    var html = escapeHtml(String(text || ''));
    var codeSpans = [];
    html = html.replace(/`([^`\n]+)`/g, function(_, code) {
      var key = '\u0000CODE' + codeSpans.length + '\u0000';
      codeSpans.push('<code>' + code + '</code>');
      return key;
    });
    html = html.replace(/\*\*([^*\n]+)\*\*/g, '<strong>$1</strong>');
    html = html.replace(/(^|[^*])\*([^*\n]+)\*/g, '$1<em>$2</em>');
    codeSpans.forEach(function(value, index) {
      html = html.replace('\u0000CODE' + index + '\u0000', value);
    });
    return html;
  }

  function renderPageAiMarkdown(content) {
    var lines = String(content || '').replace(/\r\n?/g, '\n').split('\n');
    var blocks = [];
    var index = 0;
    function isBlockBoundary(line) {
      return !line.trim() ||
        /^```/.test(line.trim()) ||
        /^#{1,6}\s+/.test(line) ||
        /^\s*[-*]\s+/.test(line) ||
        /^\s*\d+[.)]\s+/.test(line);
    }
    while (index < lines.length) {
      var line = lines[index];
      if (!line.trim()) {
        index += 1;
        continue;
      }
      if (/^```/.test(line.trim())) {
        index += 1;
        var codeLines = [];
        while (index < lines.length && !/^```/.test(lines[index].trim())) {
          codeLines.push(lines[index]);
          index += 1;
        }
        if (index < lines.length) index += 1;
        blocks.push('<pre><code>' + escapeHtml(codeLines.join('\n')) + '</code></pre>');
        continue;
      }
      var heading = line.match(/^(#{1,6})\s+(.+)$/);
      if (heading) {
        var level = Math.min(6, heading[1].length);
        blocks.push('<h' + level + '>' + renderPageAiMarkdownInline(heading[2]) + '</h' + level + '>');
        index += 1;
        continue;
      }
      if (/^\s*[-*]\s+/.test(line)) {
        var unordered = [];
        while (index < lines.length && /^\s*[-*]\s+/.test(lines[index])) {
          unordered.push('<li>' + renderPageAiMarkdownInline(lines[index].replace(/^\s*[-*]\s+/, '')) + '</li>');
          index += 1;
        }
        blocks.push('<ul>' + unordered.join('') + '</ul>');
        continue;
      }
      if (/^\s*\d+[.)]\s+/.test(line)) {
        var ordered = [];
        while (index < lines.length && /^\s*\d+[.)]\s+/.test(lines[index])) {
          ordered.push('<li>' + renderPageAiMarkdownInline(lines[index].replace(/^\s*\d+[.)]\s+/, '')) + '</li>');
          index += 1;
        }
        blocks.push('<ol>' + ordered.join('') + '</ol>');
        continue;
      }
      var paragraph = [];
      while (index < lines.length && !isBlockBoundary(lines[index])) {
        paragraph.push(renderPageAiMarkdownInline(lines[index]));
        index += 1;
      }
      if (paragraph.length) {
        blocks.push('<p>' + paragraph.join('<br />') + '</p>');
      } else {
        index += 1;
      }
    }
    return blocks.join('') || escapeHtml(String(content || ''));
  }

  return {
    textFromUnknown,
    renderPageAiMarkdown,
    renderPageAiMarkdownInline
  };
}