import fs from 'fs';
import path from 'path';
import matter from 'gray-matter';

type PostData = { slug: string[]; frontmatter: Record<string, any> };
const CONTENT_DIR = path.join(process.cwd(), 'content');

export function getAllPosts(lang: string): PostData[] {
  const dir = path.join(CONTENT_DIR, lang);
  if (!fs.existsSync(dir)) return [];
  return fs.readdirSync(dir)
    .filter(f => f.endsWith('.md'))
    .map(file => {
      const full = path.join(dir, file);
      const { data } = matter(fs.readFileSync(full, 'utf-8'));
      const slug = file.replace(/\.md$/, '');
      return { slug: [slug], frontmatter: data };
    });
}

// ===== News (Markdown CMS) =====
export type NewsItem = {
  slug: string;
  title: string;
  date: string;
  summary?: string;
  tags?: string[];
};

const NEWS_DIR = path.join(CONTENT_DIR, 'news');

export function getAllNews(): NewsItem[] {
  if (!fs.existsSync(NEWS_DIR)) return [];
  return fs
    .readdirSync(NEWS_DIR)
    .filter(f => f.endsWith('.md'))
    .map(file => {
      const full = path.join(NEWS_DIR, file);
      const { data } = matter(fs.readFileSync(full, 'utf-8'));
      const slug = file.replace(/\.md$/, '');
      return {
        slug,
        title: String(data.title || slug),
        date: String(data.date || ''),
        summary: data.summary ? String(data.summary) : undefined,
        tags: Array.isArray(data.tags) ? data.tags.map(String) : undefined,
      } as NewsItem;
    })
    .sort((a, b) => (a.date < b.date ? 1 : -1));
}

export function getNewsBySlug(slug: string): { frontmatter: Record<string, any>; content: string } | null {
  const filepath = path.join(NEWS_DIR, `${slug}.md`);
  if (!fs.existsSync(filepath)) return null;
  const raw = fs.readFileSync(filepath, 'utf-8');
  const { data, content } = matter(raw);
  return { frontmatter: data, content };
}