import { NextResponse } from "next/server"
import type { NextRequest } from "next/server"
import {
  PRODUCTION_HOST,
  PRODUCTION_WEBSITE,
  isProductionHost,
  normalizeHost,
} from "@/lib/seo-config"

export const dynamic = "force-dynamic"

const productionRobots = `User-agent: *
Allow: /
Disallow: /api/
Disallow: /admin/
Disallow: /_next/
Disallow: /test-page/
Disallow: /manuals/dashboard/

Sitemap: ${PRODUCTION_WEBSITE}/sitemap.xml
Host: ${PRODUCTION_HOST}
`

const previewRobots = `User-agent: *
Disallow: /

Sitemap: ${PRODUCTION_WEBSITE}/sitemap.xml
Host: ${PRODUCTION_HOST}
`

export function GET(request: NextRequest) {
  const host = normalizeHost(request.headers.get("host"))
  const body = isProductionHost(host) ? productionRobots : previewRobots

  return new NextResponse(body, {
    headers: {
      "Content-Type": "text/plain; charset=utf-8",
    },
  })
}