package api

import (
	"net/http"

	"git.golem15.com/golem15/sm-seo-plugin/classes"
)

// LLMS serves GET /llms.txt at the site root (D-25, UI-SPEC C25): while
// llms.txt is on (the robots.txt screen's AI bots tab) and in production,
// the site's indexable pages from the sitemaps as text/plain; otherwise
// 404.
func LLMS(service func() *classes.Service) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		svc := service()
		if svc == nil {
			http.Error(w, "SEO is not available", http.StatusServiceUnavailable)
			return
		}
		body, ok, err := svc.LLMSText(r.Context())
		if err != nil {
			log.Error("golem15.seo: llms.txt", "error", err)
			http.Error(w, "Internal Server Error", http.StatusInternalServerError)
			return
		}
		if !ok {
			http.NotFound(w, r)
			return
		}
		w.Header().Set("Content-Type", "text/plain; charset=utf-8")
		w.Header().Set("X-Content-Type-Options", "nosniff")
		_, _ = w.Write([]byte(body))
	}
}