const fs = require('fs');
const path = require('path');
const fetch = (...args) => import('node-fetch').then(({default: fetch}) => fetch(...args));

const WORDPRESS_API = 'https://wp.mistergeek.net/wp-json/wp/v2';
const OUTPUT_DIR = path.join(__dirname, '..', 'data', 'wordpress');
const HUGO_DATA_DIR = path.join(__dirname, '..', 'data');

async function fetchAll(endpoint, perPage = 100) {
  let page = 1;
  let items = [];

  while (true) {
    const url = `${WORDPRESS_API}/${endpoint}?page=${page}&per_page=${perPage}&_embed`;
    const response = await fetch(url);

    // If endpoint does not support paging or returns empty, break
    if (!response.ok) {
      // 400 often means "page out of range" for WP; stop paging
      if (response.status === 400) break;
      throw new Error(`Failed to fetch ${endpoint} (page ${page}): ${response.status} ${response.statusText}`);
    }

    const batch = await response.json();
    items = items.concat(batch);

    const totalPages = parseInt(response.headers.get('x-wp-totalpages') || '1', 10);
    if (page >= totalPages) break;
    page++;
  }

  return items;
}

async function generateData() {
  // Ensure output directory exists
  if (!fs.existsSync(OUTPUT_DIR)) {
    fs.mkdirSync(OUTPUT_DIR, { recursive: true });
  }

  console.log('Fetching WordPress data...');

  // Fetch all relevant endpoints concurrently (pages + posts + taxonomies + users)
  const [
    posts,
    pages,
    categories,
    tags,
    authors
  ] = await Promise.all([
    fetchAll('posts'),
    fetchAll('pages'),
    fetchAll('categories'),
    fetchAll('tags'),
    fetchAll('users')
  ]);

  // Filter pages to only include published pages
  const publishedPages = pages.filter(page => page.status === 'publish');

  // Create navigation data from published pages
  const navigationData = publishedPages.map(page => ({
    id: page.id,
    title: page.title?.rendered || page.slug,
    slug: page.slug,
    link: page.link,
    date: page.date,
    modified: page.modified
  }));

  // Create author-post mapping
  const authorPosts = {};
  posts.forEach(post => {
    if (post.status === 'publish') {
      const author = post._embedded?.author?.[0];
      if (author) {
        const authorSlug = author.slug;
        if (!authorPosts[authorSlug]) {
          authorPosts[authorSlug] = {
            id: author.id,
            name: author.name,
            slug: author.slug,
            description: author.description || '',
            avatar: author.avatar_urls || {},
            link: author.link,
            posts: []
          };
        }
        authorPosts[authorSlug].posts.push({
          id: post.id,
          title: post.title.rendered,
          slug: post.slug,
          date: post.date,
          excerpt: post.excerpt.rendered,
          featured_image: post._embedded?.['wp:featuredmedia']?.[0]?.source_url || '',
          categories: (post._embedded?.['wp:term']?.[0] || []).map(cat => ({
            id: cat.id,
            name: cat.name,
            slug: cat.slug
          })),
          tags: (post._embedded?.['wp:term']?.[1] || []).map(tag => ({
            id: tag.id,
            name: tag.name,
            slug: tag.slug
          }))
        });
      }
    }
  });

  // Save data as JSON files
  fs.writeFileSync(path.join(OUTPUT_DIR, 'posts.json'), JSON.stringify(posts, null, 2));
  fs.writeFileSync(path.join(OUTPUT_DIR, 'pages.json'), JSON.stringify(publishedPages, null, 2));
  // Extract category descriptions
  const categoriesWithDescriptions = categories.map(cat => ({
    id: cat.id,
    name: cat.name,
    slug: cat.slug,
    description: cat.description || '',
    count: cat.count || 0
  }));

  // Also save to wordpress directory
  fs.writeFileSync(path.join(OUTPUT_DIR, 'categories.json'), JSON.stringify(categories, null, 2));
  fs.writeFileSync(path.join(OUTPUT_DIR, 'tags.json'), JSON.stringify(tags, null, 2));
  fs.writeFileSync(path.join(OUTPUT_DIR, 'authors.json'), JSON.stringify(authors, null, 2));
  fs.writeFileSync(path.join(OUTPUT_DIR, 'author-posts.json'), JSON.stringify(authorPosts, null, 2));
  fs.writeFileSync(path.join(OUTPUT_DIR, 'navigation.json'), JSON.stringify(navigationData, null, 2));

  console.log(`✅ Fetched ${posts.length} posts, ${publishedPages.length} pages, ${categories.length} categories, ${tags.length} tags, ${authors.length} authors`);
  console.log(`✅ Generated navigation data with ${navigationData.length} items`);
}

generateData().catch(console.error);