#!/usr/bin/env ts-node
/**
 * Master Brochure Generator
 * 
 * Generates a multi-page PDF brochure containing all products.
 * Combines Payload CMS marketing text with Excel technical data.
 */

import * as fs from 'fs';
import * as path from 'path';
import * as React from 'react';
import { renderToBuffer } from '@react-pdf/renderer';
import { getAllProducts } from '../lib/products';
import { getExcelTechnicalDataForProduct, preloadExcelData } from '../lib/excel-products';
import { PDFBrochure } from '../lib/pdf-brochure';
import { ProductData as PDFProductData } from '../lib/pdf-datasheet';

const CONFIG = {
  outputDir: path.join(process.cwd(), 'public/downloads'),
  locales: ['en', 'de'] as const,
} as const;

async function ensureOutputDir() {
  if (!fs.existsSync(CONFIG.outputDir)) {
    fs.mkdirSync(CONFIG.outputDir, { recursive: true });
  }
}

async function generateBrochure(locale: 'en' | 'de') {
  console.log(`\nGenerating brochure for locale: ${locale.toUpperCase()}...`);
  
  // 1. Load data
  const products = await getAllProducts(locale);
  console.log(`- Loaded ${products.length} products from Payload`);
  
  // 2. Map and Enrich
  const pdfProducts: PDFProductData[] = products.map((p, index) => {
    const excelData = getExcelTechnicalDataForProduct({
      slug: p.slug,
      sku: p.frontmatter.sku,
      name: p.frontmatter.title,
    });

    return {
      id: index + 1,
      name: p.frontmatter.title,
      sku: p.frontmatter.sku,
      shortDescriptionHtml: p.frontmatter.description,
      descriptionHtml: p.frontmatter.description,
      applicationHtml: '',
      featuredImage: p.frontmatter.images[0] || null,
      images: p.frontmatter.images,
      categories: p.frontmatter.categories.map(name => ({ name })),
      attributes: excelData?.attributes || [],
    };
  });

  if (pdfProducts.length === 0) {
    console.warn(`! No products found for ${locale}. Skipping.`);
    return;
  }

  // 3. Render
  console.log(`- Rendering PDF with ${pdfProducts.length} pages...`);
  const buffer = await renderToBuffer(
    React.createElement(PDFBrochure, {
      products: pdfProducts,
      locale,
      title: locale === 'de' ? 'Produktkatalog' : 'Product Catalog',
      subtitle: '2026',
    })
  );

  // 4. Save
  const fileName = `KLZ_Cables_Brochure_2026_${locale.toUpperCase()}.pdf`;
  const filePath = path.join(CONFIG.outputDir, fileName);
  fs.writeFileSync(filePath, buffer);
  
  const stats = fs.statSync(filePath);
  console.log(`✓ Generated: ${fileName} (${(stats.size / 1024 / 1024).toFixed(2)} MB)`);
}

async function main() {
  const start = Date.now();
  console.log('--- KLZ Brochure Generator ---');
  
  try {
    await ensureOutputDir();
    preloadExcelData();
    
    for (const locale of CONFIG.locales) {
      await generateBrochure(locale);
    }
    
    console.log(`\n✅ Brochure generation completed in ${((Date.now() - start) / 1000).toFixed(2)}s`);
  } catch (error) {
    console.error('\n❌ Fatal error:', error);
    process.exit(1);
  }
}

main().catch(console.error);