// server/routes/robots.txt.ts
type RobotsConfig = {
    userAgent?: string | string[]
    allow?: string[]
    disallow?: string[]
    sitemap?: string | string[]
    host?: string
    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];
  }

//     if (gameAlias && gameAlias !== "www") {
//       event.context.gameAlias = gameAlias;
//     }
//   }
    // robots 설정을 직접 가져오기 (미들웨어 context 사용)
    
    let config: RobotsConfig;
    
    try {
      
      // robots 설정 추출
      config = {
        userAgent: "*",
        allow: ["/"],
        disallow: ["/error", "/inspection/", "/inspection/*", "/html/*"],
        sitemap: [`https://static-pubcomm.gate8.com/local/template/${gameAlias}/sitemap.xml`],
        host: `${gameAlias}.onstove.com`,
        cache: { sMaxAge: 300, staleWhileRevalidate: 600 }
      };
    } catch (error) {
      console.error('Failed to fetch robots config:', error);
      
      // 에러 발생 시 기본값 반환
      config = {
        userAgent: "*",
        allow: ["/"],
        disallow: ["/error", "/inspection/", "/inspection/*", "/html/*"],
        cache: { sMaxAge: 300, staleWhileRevalidate: 600 }
      };
    }
  
    setHeader(event, "Content-Type", "text/plain; charset=utf-8")
  
    // 캐시 헤더 (CDN 친화)
    const sMax = config.cache?.sMaxAge ?? 300
    const swr   = config.cache?.staleWhileRevalidate ?? 600
    setHeader(event, "Cache-Control", `public, s-maxage=${sMax}, stale-while-revalidate=${swr}`)
  
    // 여러 user-agent 지원
    const agents = Array.isArray(config.userAgent) ? config.userAgent : [config.userAgent ?? "*"]
  
    const lines: string[] = []
    for (const ua of agents) {
      lines.push(`User-agent: ${ua}`)
      for (const p of config.allow ?? [])    lines.push(`Allow: ${p}`)
      for (const p of config.disallow ?? []) lines.push(`Disallow: ${p}`)
      lines.push("") // 블록 구분 공백
    }
  
    const sitemaps = Array.isArray(config.sitemap) ? config.sitemap : (config.sitemap ? [config.sitemap] : [])
    for (const sm of sitemaps) lines.push(`Sitemap: ${sm}`)
    if (config.host) lines.push(`Host: ${config.host}`)
  
    // 마지막 개행
    return lines.join("\n").trim() + "\n"
  })