import { NextResponse } from 'next/server';
import { dataService } from '@/lib/data-service';
import { generateWhatsAppCatalogCsv } from '@/lib/whatsapp-catalog';
import { getProductsFromAppwrite } from '@/lib/server-appwrite';

export const dynamic = 'force-dynamic';
export const revalidate = 0;

export async function GET() {
  try {
    let products = dataService.getProducts();

    // Sincronizar siempre con Appwrite para garantizar catálogo en tiempo real
    try {
      const appwriteProducts = await getProductsFromAppwrite();
      if (appwriteProducts && appwriteProducts.length > 0) {
        const existingIds = new Set(products.map((p) => p.id));
        for (const ap of appwriteProducts) {
          if (!existingIds.has(ap.id)) {
            dataService.addProduct(ap);
          }
        }
        products = dataService.getProducts();
      }
    } catch (e: any) {
      console.warn('Error sincronizando productos con Appwrite para CSV Feed:', e.message);
    }

    const csv = generateWhatsAppCatalogCsv(products);

    return new Response(csv, {
      status: 200,
      headers: {
        'Content-Type': 'text/csv; charset=utf-8',
        'Content-Disposition': 'inline; filename="dripzone_whatsapp_catalog.csv"',
        'Cache-Control': 'public, max-age=60, s-maxage=60, stale-while-revalidate=120',
      },
    });
  } catch (error: any) {
    console.error('[WhatsApp Catalog Feed CSV] Error:', error);
    return new NextResponse('error,message\n500,"Error generating CSV catalog feed"', {
      status: 500,
      headers: { 'Content-Type': 'text/csv; charset=utf-8' },
    });
  }
}