package handler

import (
	"context"
	"net/http"
	"time"

	"github.com/prabhupadasays/spsays-bff/internal/repository"
	"github.com/prabhupadasays/spsays-bff/pkg/response"
)

// SitemapHandler serves the flat list of public content URLs the frontend
// turns into sitemap XML. Public + heavily cached on the frontend (daily
// ISR), so this expensive-ish sweep runs ~once/day, never per crawler request.
type SitemapHandler struct{ repo *repository.SitemapRepo }

func NewSitemapHandler(repo *repository.SitemapRepo) *SitemapHandler {
	return &SitemapHandler{repo: repo}
}

// GetContent — GET /sitemap/content → { "urls": ["/books/bg/1/1", …] }.
func (h *SitemapHandler) GetContent(w http.ResponseWriter, r *http.Request) {
	// The sweep touches tens of thousands of docs across several collections;
	// give it room but bound it so a stuck query can't hang the handler.
	ctx, cancel := context.WithTimeout(r.Context(), 90*time.Second)
	defer cancel()

	urls, err := h.repo.ContentURLs(ctx)
	if err != nil {
		response.Error(w, http.StatusInternalServerError, "could not build sitemap")
		return
	}
	response.JSON(w, http.StatusOK, map[string]any{"urls": urls})
}