import fs from 'fs/promises';
import path from 'path';
import matter from 'gray-matter';
import { config } from '@/lib/config';

export interface ProductFrontmatter {
  title: string;
  sku: string;
  description: string;
  categories: string[];
  images: string[];
  focalX?: number;
  focalY?: number;
  isFallback?: boolean;
}

export interface ProductData {
  slug: string;
  frontmatter: ProductFrontmatter;
  content: any; // Lexical AST from Payload
  application?: any; // Lexical AST for Application field
}

export async function getProductMetadata(
  slug: string,
  locale: string,
): Promise<Partial<ProductData> | null> {
  const p = await getProductBySlug(slug, locale);
  if (!p) return null;
  return {
    slug: p.slug,
    frontmatter: p.frontmatter,
  };
}

export async function getProductBySlug(slug: string, locale: string): Promise<ProductData | null> {
  try {
    const filePath = path.join(process.cwd(), 'content', 'products', `${slug}.mdx`);
    const fileContent = await fs.readFile(filePath, 'utf-8');
    const { data, content } = matter(fileContent);

    // Fix MDX data props dropped by next-mdx-remote
    // Payload serializes as data={{"items":...}} which Acorn treats as a Block statement.
    const fixedContent = content.replace(/data=\{\{([\s\S]*?)\}\}/g, (match, p1) => {
      return 'data="{' + p1.replace(/"/g, '&quot;') + '}"';
    });

    let parsedContent = fixedContent;
    try {
      if (content.trim().startsWith('{')) {
        parsedContent = JSON.parse(content);
      }
    } catch (e) {
      // Not JSON
    }

    // Filter images
    const resolvedImages = ((data.images as any[]) || [])
      .map((img) => (typeof img === 'string' ? img : img?.url))
      .filter(Boolean);

    if (resolvedImages.length === 0) return null;

    return {
      slug,
      frontmatter: {
        title: data.title || '',
        sku: data.sku || '',
        description: data.description || '',
        categories: Array.isArray(data.categories)
          ? data.categories.map((c: any) => c?.category || c)
          : [],
        images: resolvedImages,
        focalX: data.focalX || 50,
        focalY: data.focalY || 50,
      },
      content: parsedContent,
      application: data.application,
    };
  } catch (error) {
    console.error(`getProductBySlug failed for ${slug}:`, error);
    return null;
  }
}

export async function getAllProductSlugs(locale: string): Promise<string[]> {
  try {
    const dir = path.join(process.cwd(), 'content', 'products');
    const files = await fs.readdir(dir);
    return files.filter((f) => f.endsWith('.mdx')).map((f) => f.replace('.mdx', ''));
  } catch (error) {
    console.error(`getAllProductSlugs failed for ${locale}:`, error);
    return [];
  }
}

export async function getAllProducts(locale: string): Promise<ProductData[]> {
  try {
    const slugs = await getAllProductSlugs(locale);
    const products = await Promise.all(slugs.map((slug) => getProductBySlug(slug, locale)));
    return products.filter(
      (p): p is ProductData =>
        p !== null && p.frontmatter.images && p.frontmatter.images.length > 0,
    );
  } catch (error) {
    console.error(`getAllProducts failed for ${locale}:`, error);
    return [];
  }
}

export async function getAllProductsMetadata(locale: string): Promise<Partial<ProductData>[]> {
  const products = await getAllProducts(locale);
  return products.map((p) => ({
    slug: p.slug,
    frontmatter: p.frontmatter,
  }));
}