import { NextResponse } from 'next/server';
import { productService } from '../../lib/services/productService';
import { PRODUCTS } from '../../lib/data/products';

export const dynamic = 'force-dynamic';
export const revalidate = 3600; // Revalidate every hour

export async function GET() {
  const baseUrl = process.env.NEXT_PUBLIC_SITE_URL || 'https://canina.ir';
  
  let productsList: any[] = [];
  try {
    const res = await productService.getProducts({ limit: 999 });
    productsList = res.data && res.data.length > 0 ? res.data : PRODUCTS;
  } catch {
    productsList = PRODUCTS;
  }

  // Filter out noIndex products
  const indexableProducts = productsList.filter(p => !p.noIndex);

  const urlsXml = indexableProducts.map(product => {
    const slug = product.slug || product.artNo || product.id;
    const loc = `${baseUrl}/shop/${slug}`;
    const lastmod = product.updatedAt ? new Date(product.updatedAt).toISOString() : new Date().toISOString();
    const primaryImg = product.ogImage || product.image;
    const title = product.nameFa || product.name || 'مکمل درمانی کنینا';

    const imageTag = primaryImg ? `
    <image:image>
      <image:loc>${primaryImg.startsWith('http') ? primaryImg : `${baseUrl}${primaryImg}`}</image:loc>
      <image:title><![CDATA[${title}]]></image:title>
    </image:image>` : '';

    return `  <url>
    <loc>${loc}</loc>
    <lastmod>${lastmod}</lastmod>
    <changefreq>daily</changefreq>
    <priority>0.9</priority>${imageTag}
  </url>`;
  }).join('\n');

  const xmlContent = `<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
        xmlns:image="http://www.google.com/schemas/sitemap-image/1.1">
${urlsXml}
</urlset>`;

  return new NextResponse(xmlContent, {
    status: 200,
    headers: {
      'Content-Type': 'application/xml; charset=utf-8',
      'Cache-Control': 'public, max-age=3600, s-maxage=3600, stale-while-revalidate=86400',
    },
  });
}