// src/lib/blog.ts
import fs from 'fs';
import path from 'path';
import matter from 'gray-matter';
import { remark } from 'remark';
import html from 'remark-html';

const postsDirectory = path.join(process.cwd(), 'content/case-studies');

export async function getPostBySlug(slug: string) {
  const fullPath = path.join(postsDirectory, `${slug}.md`);
  
  // Guard against file system traversal attacks or missing files
  if (!fs.existsSync(fullPath)) {
    return null;
  }

  const fileContents = fs.readFileSync(fullPath, 'utf8');
  
  // Use gray-matter to parse the study metadata section
  const { data, content } = matter(fileContents);

  // Use remark to convert markdown into HTML string
  const processedContent = await remark().use(html).process(content);
  const contentHtml = processedContent.toString();

  return {
    slug,
    contentHtml,
    title: data.title || 'Untitled Study',
    ...data,
  };
}