// server/routes/sitemap.xml.ts
type SitemapUrl = {
  loc: string
  lastmod?: string
  changefreq?: 'always' | 'hourly' | 'daily' | 'weekly' | 'monthly' | 'yearly' | 'never'
  priority?: number
}

type SitemapConfig = {
  urls: SitemapUrl[]
  cache?: { sMaxAge?: number; staleWhileRevalidate?: number }
}

export default defineEventHandler(async (event) => {
  const host = (getHeader(event, "host") || getRequestHost(event)).toString() || "";
  const baseDomain = process.env.BASE_DOMAIN || ".onstove.com";
  const isGameAliasExtractable = host.includes(baseDomain);
  
  let gameAlias = "";
  if (isGameAliasExtractable) {
    gameAlias = host.split(".")[0] || "";
  }

  let config: SitemapConfig;
  

  try {
    // 외부 API에서 sitemap 설정 가져오기
    const response = await $fetch('https://static-pubcomm.gate8.com/dev/test0905/dataization/test0905_homepage_brand_siteConfig.json') as any;
    
    // sitemap 설정에서 urls만 추출
    const sitemapUrls = response.sitemap?.urls || [];
    
    config = {
      urls: sitemapUrls,
      cache: { sMaxAge: 3600, staleWhileRevalidate: 7200 }
    };
  } catch (error) {
    console.error('Failed to fetch sitemap config:', error);
    
    // 에러 발생 시 빈 배열 반환
    config = {
      urls: [],
      cache: { sMaxAge: 3600, staleWhileRevalidate: 7200 }
    };
  }

  setHeader(event, "Content-Type", "application/xml; charset=utf-8");

  // 캐시 헤더 (CDN 친화)
  const sMax = config.cache?.sMaxAge ?? 3600;
  const swr = config.cache?.staleWhileRevalidate ?? 7200;
  setHeader(event, "Cache-Control", `public, s-maxage=${sMax}, stale-while-revalidate=${swr}`);

  // XML 생성
  const xml = `<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
${config.urls.map(url => `  <url>
    <loc>${url.loc}</loc>
    ${url.lastmod ? `    <lastmod>${url.lastmod}</lastmod>` : ''}
    ${url.changefreq ? `    <changefreq>${url.changefreq}</changefreq>` : ''}
    ${url.priority ? `    <priority>${url.priority}</priority>` : ''}
  </url>`).join('\n')}
</urlset>`;

  return xml;
});