function doGet(e) {
  var docId = e && e.parameter && e.parameter.id ? e.parameter.id : 'YOUR_DEFAULT_DOC_ID';
  var page = e && e.parameter && e.parameter.page ? parseInt(e.parameter.page) : 1;
  var postsPerPage = 5;

  var doc = DocumentApp.openById(docId);
  var paragraphs = doc.getBody().getParagraphs();
  var allPosts = parseContentRich(paragraphs);
  var paginatedPosts = paginatePosts(allPosts, page, postsPerPage);

  var jsonOutput = JSON.stringify({
    documentTitle: doc.getName(),
    posts: paginatedPosts.posts,
    totalPosts: allPosts.length,
    currentPage: page,
    hasMore: paginatedPosts.hasMore
  });

  return ContentService.createTextOutput(jsonOutput)
    .setMimeType(ContentService.MimeType.JSON);
}

function parseContentRich(paragraphs) {
  var posts = [];
  var currentPost = null;

  for (var i = 0; i < paragraphs.length; i++) {
    var para = paragraphs[i];
    var plainLine = para.getText().trim();
    var htmlLine = textElementToHtml(para);

    if (plainLine.startsWith('---POST---')) {
      if (currentPost) {
        posts.push(currentPost);
      }
      currentPost = {
        title: plainLine.replace('---POST---', '').trim(),
        publishDate: '',
        content: []
      };
    } else if (plainLine.startsWith('---DATE---') && currentPost) {
      currentPost.publishDate = plainLine.replace('---DATE---', '').trim();
    } else if (currentPost) {
      currentPost.content.push(htmlLine);
    }
  }
  if (currentPost) {
    posts.push(currentPost);
  }

  // Join content lines with <br>, or use <p> if you want real paragraphs
  return posts.map(function(post) {
    return {
      title: post.title,
      publishDate: post.publishDate,
      content: post.content.join('<br>\n').trim()
    };
  });
}

// Converts a Paragraph to HTML with formatting
function textElementToHtml(para) {
  var html = '';
  for (var j = 0; j < para.getNumChildren(); j++) {
    var elem = para.getChild(j);
    if (elem.getType() === DocumentApp.ElementType.TEXT) {
      html += processTextElem(elem);
    }
  }
  return html;
}

function processTextElem(textElem) {
  var text = textElem.getText();
  var html = '';
  var i = 0;
  while (i < text.length) {
    // Get the formatting at the current position
    var bold = textElem.isBold(i);
    var italic = textElem.isItalic(i);
    var underline = textElem.isUnderline(i);
    var url = textElem.getLinkUrl(i);

    // Find the next point where formatting changes
    var j = i + 1;
    while (j < text.length &&
           textElem.isBold(j) === bold &&
           textElem.isItalic(j) === italic &&
           textElem.isUnderline(j) === underline &&
           textElem.getLinkUrl(j) === url) {
      j++;
    }

    // Get the substring with the same formatting
    var substr = text.substring(i, j)
      .replace(/&/g,"&amp;").replace(/</g,"&lt;").replace(/>/g,"&gt;");

    // Wrap the substring as needed
    if (url) substr = '<a href="' + url + '" target="_blank">' + substr + '</a>';
    if (underline) substr = '<u>' + substr + '</u>';
    if (italic) substr = '<em>' + substr + '</em>';
    if (bold) substr = '<strong>' + substr + '</strong>';

    html += substr;
    i = j;
  }
  return html;
}

function paginatePosts(posts, page, postsPerPage) {
  var startIndex = (page - 1) * postsPerPage;
  var endIndex = startIndex + postsPerPage;
  var paginatedPosts = posts.slice(startIndex, endIndex);

  return {
    posts: paginatedPosts,
    hasMore: endIndex < posts.length
  };
}