import type { MetadataRoute } from "next";
import { unstable_noStore as noStore } from "next/cache";

import { getMaintenanceMode, getSeoSettings } from "@/lib/app-config";
import { INTERNAL_ADMIN_PREFIX } from "@/lib/admin-routing";
import { getSiteUrl } from "@/lib/metadata";

export const dynamic = "force-dynamic";

/** Paths that must never be crawled even when indexing is enabled. */
export const ROBOTS_DISALLOWED_PATHS = [
  INTERNAL_ADMIN_PREFIX,
  "/root",
  "/api/",
  "/success",
  "/coming-soon",
  "/*/success",
  "/*/coming-soon",
];

export function buildRobots(input: { indexable: boolean }): MetadataRoute.Robots {
  const siteUrl = getSiteUrl();

  if (!input.indexable) {
    return {
      rules: [{ userAgent: "*", disallow: "/" }],
      host: siteUrl.origin,
    };
  }

  return {
    rules: [
      {
        userAgent: "*",
        allow: "/",
        disallow: ROBOTS_DISALLOWED_PATHS,
      },
    ],
    sitemap: new URL("/sitemap.xml", siteUrl).toString(),
    host: siteUrl.origin,
  };
}

export default async function robots(): Promise<MetadataRoute.Robots> {
  noStore();
  const [seo, maintenanceEnabled] = await Promise.all([getSeoSettings(), getMaintenanceMode()]);

  return buildRobots({ indexable: seo.allowIndexing && !maintenanceEnabled });
}