import fs from 'fs';
import path from 'path';

let cachedData: any = null;

/**
 * Load WordPress processed content
 * This must only be called server-side (in getStaticProps, getServerSideProps, or API routes)
 */
export function loadWordPressData() {
  if (cachedData) {
    return cachedData;
  }

  try {
    // In Next.js, process.cwd() returns the code directory (where Next.js runs from)
    const dataPath = path.join(process.cwd(), 'lib', 'wordpress-data', 'processed-content.json');
    
    // Check if file exists
    if (!fs.existsSync(dataPath)) {
      // Silently return empty data in production
      if (process.env.NODE_ENV === 'development') {
        console.error('WordPress data file not found at:', dataPath);
      }
      return { pages: [], posts: [], images: [] };
    }
    
    const data = JSON.parse(fs.readFileSync(dataPath, 'utf8'));
    cachedData = data;
    return data;
  } catch (e) {
    // Silently return empty data in production
    if (process.env.NODE_ENV === 'development') {
      console.error('Could not load WordPress data:', e);
    }
    return { pages: [], posts: [], images: [] };
  }
}

/**
 * Load image mapping
 */
export function loadImageMappingData() {
  try {
    const mappingPath = path.join(process.cwd(), 'lib', 'wordpress-data', 'image-mapping.json');
    const mapping = JSON.parse(fs.readFileSync(mappingPath, 'utf8'));
    return mapping;
  } catch (e) {
    // Silently return empty array in production
    if (process.env.NODE_ENV === 'development') {
      console.warn('Could not load image mapping:', e);
    }
    return [];
  }
}

/**
 * Get page by slug
 */
export function getPageBySlug(slug: string) {
  const data = loadWordPressData();
  return data.pages.find((p: any) => p.slug === slug);
}

/**
 * Get post by slug and date
 */
export function getPostBySlugAndDate(
  slug: string,
  year: string,
  month: string,
  day: string
) {
  const data = loadWordPressData();
  return data.posts.find(
    (p: any) =>
      p.slug === slug &&
      p.dateComponents?.year === year &&
      p.dateComponents?.month === month &&
      p.dateComponents?.day === day
  );
}

/**
 * Get all page slugs for static generation
 */
export function getAllPageSlugs() {
  const data = loadWordPressData();
  return data.pages.map((p: any) => p.slug);
}

/**
 * Get all post params for static generation
 */
export function getAllPostParams() {
  const data = loadWordPressData();
  return data.posts
    .map((p: any) => {
      if (!p.dateComponents) return null;
      return {
        year: p.dateComponents.year,
        month: p.dateComponents.month,
        day: p.dateComponents.day,
        slug: p.slug,
      };
    })
    .filter(Boolean);
}