export default {
  async fetch(request) {
    const url = new URL(request.url);

    const pathname = url.pathname;
    const hostname = url.hostname;

    const isBlogPath = pathname.startsWith("/blog");

    const isAdminPath =
      pathname.includes("/wp-admin") ||
      pathname.includes("/wp-login.php") ||
      pathname.includes("/wp-json") ||
      pathname.includes("/xmlrpc.php") ||
      pathname.includes("/admin-ajax.php");

    const cookie = request.headers.get("cookie") || "";
    const hasAuthCookie =
      cookie.includes("wordpress_logged_in") ||
      cookie.includes("wordpress_sec") ||
      cookie.includes("wp-settings-");

    // =====================================================
    // 1. FORCE API TO SUBDOMAIN 
    // =====================================================
    if (pathname.startsWith("/blog/wp-json")) {
      return Response.redirect(
        "https://blog.rtspvtltd.com/wp-json" +
          pathname.replace("/blog/wp-json", ""),
        302
      );
    }

    // =====================================================
    // 2. FORCE ADMIN TO SUBDOMAIN
    // =====================================================
    if (pathname.startsWith("/blog/wp-admin")) {
      return Response.redirect(
        "https://blog.rtspvtltd.com/wp-admin",
        302
      );
    }

    // =====================================================
    // Redirect subdomain → main domain /blog
    // (except admin & API)
    // =====================================================
    if (hostname === "blog.rtspvtltd.com" && !isAdminPath) {
      return Response.redirect(
        "https://rtspvtltd.com/blog" + pathname,
        301
      );
    }

    // =====================================================
    // Proxy /blog → subdomain
    // =====================================================
    if (isBlogPath) {
      const newUrl = new URL(request.url);
      newUrl.hostname = "blog.rtspvtltd.com";
      newUrl.pathname = newUrl.pathname.replace("/blog", "") || "/";

      // No cache for admin or logged-in users
      if (isAdminPath || hasAuthCookie) {
        return fetch(newUrl, {
          cf: { cacheTtl: 0, cacheEverything: false }
        });
      }

      // Static files (1 day cache)
      const isStatic = /\.(jpg|jpeg|png|gif|webp|svg|css|js|woff|woff2|ttf|ico)$/i.test(newUrl.pathname);

      if (isStatic) {
        return fetch(newUrl, {
          cf: {
            cacheTtl: 86400,
            cacheEverything: true
          }
        });
      }

      // HTML (short cache)
      return fetch(newUrl, {
        cf: {
          cacheTtl: 300,
          cacheEverything: true
        }
      });
    }

    // =====================================================
    // Default
    // =====================================================
    return fetch(request);
  }
};