import fs from 'fs';
import path from 'path';
import matter from 'gray-matter';
import { mapSlugToFileSlug } from './slugs';

const CONTENT_DIR = path.join(process.cwd(), 'content');

export interface PageFrontmatter {
  title: string;
  excerpt?: string;
  featuredImage?: string | null;
  focalX?: number;
  focalY?: number;
  layout?: 'default' | 'fullBleed';
  public?: boolean;
  description?: string;
}

export interface PageData {
  slug: string;
  frontmatter: PageFrontmatter;
  content: string;
}

export async function getPageBySlug(slug: string, locale: string): Promise<PageData | null> {
  const fileSlug = await mapSlugToFileSlug(slug, locale);
  const filePath = path.join(CONTENT_DIR, locale, `${fileSlug}.mdx`);
  
  if (!fs.existsSync(filePath)) {
    return null;
  }

  const source = fs.readFileSync(filePath, 'utf8');
  const { content, data } = matter(source);

  return {
    slug,
    frontmatter: data as PageFrontmatter,
    content,
  };
}

export async function getAllPages(locale: string): Promise<PageData[]> {
  const localeDir = path.join(CONTENT_DIR, locale);
  if (!fs.existsSync(localeDir)) return [];

  const files = fs.readdirSync(localeDir).filter(f => f.endsWith('.mdx'));
  
  const pages = await Promise.all(
    files.map(async f => {
      const slug = f.replace('.mdx', '');
      return await getPageBySlug(slug, locale);
    })
  );

  return pages.filter((p): p is PageData => p !== null);
}

export async function getAllPagesMetadata(locale: string): Promise<PageData[]> {
  const localeDir = path.join(CONTENT_DIR, locale);
  if (!fs.existsSync(localeDir)) return [];

  const files = fs.readdirSync(localeDir).filter(f => f.endsWith('.mdx'));
  
  return files.map(f => {
    const slug = f.replace('.mdx', '');
    const filePath = path.join(localeDir, f);
    const source = fs.readFileSync(filePath, 'utf8');
    const { data } = matter(source);
    return {
      slug,
      frontmatter: data as PageFrontmatter,
      content: '', // Metadata only
    };
  });
}