import type { APIRoute } from 'astro';
import { 
  getEnv, 
  generateSitemapXml, 
  inferChangeFreq, 
  inferPriority,
  type SitemapUrl 
} from '../lib/astro-helpers';
import { listDocuments } from '../lib/documents';

/**
 * Dynamiczny sitemap generator
 * GET /sitemap.xml
 */
export const GET: APIRoute = async ({ site }) => {
  const base = site?.toString().replace(/\/$/, '') || 
               getEnv('PUBLIC_SITE_URL') || 
               "https://www.fuz.pl";

  const now = new Date().toISOString();
  const urls: SitemapUrl[] = [];

  // ========================================
  // STATYCZNE STRONY
  // ========================================
  const staticPages = [
    '/',
    '/internet-swiatlowodowy',
    '/internet-telewizja',
    '/telefon',
    '/mapa-zasiegu',
    '/kontakt',
    '/dokumenty',
    '/premium',
    '/telewizja-mozliwosci',
  ];

  staticPages.forEach(path => {
    urls.push({
      loc: `${base}${path}`,
      lastmod: now,
      changefreq: inferChangeFreq(path),
      priority: inferPriority(path),
    });
  });

  // ========================================
  // DYNAMICZNE STRONY: Dokumenty
  // ========================================
  try {
    const docs = listDocuments();
    
    docs
      .filter(d => d.visible === true)
      .forEach(d => {
        const path = `/dokumenty/${d.slug}`;
        urls.push({
          loc: `${base}${path}`,
          lastmod: now,
          changefreq: 'yearly',
          priority: 0.5,
        });
      });
  } catch (e) {
    console.warn('⚠️ Sitemap: Could not load documents:', e);
  }

  // ========================================
  // DYNAMICZNE STRONY: Premium packages (opcjonalnie)
  // ========================================
  // TODO: Jeśli masz dynamiczne pakiety premium, dodaj tutaj:
  /*
  try {
    const packages = await loadPremiumPackages();
    packages.forEach(p => {
      urls.push({
        loc: `${base}/premium/${p.tid}`,
        lastmod: now,
        changefreq: 'monthly',
        priority: 0.7,
      });
    });
  } catch (e) {
    console.warn('⚠️ Sitemap: Could not load premium packages:', e);
  }
  */

  // ========================================
  // GENERUJ XML
  // ========================================
  const sitemap = generateSitemapXml(urls);

  return new Response(sitemap, {
    status: 200,
    headers: {
      'Content-Type': 'application/xml; charset=utf-8',
      'Cache-Control': 'public, max-age=3600', // 1h cache
    },
  });
};