package restgallery

import (
	"fmt"
	"log/slog"
	"net/http"

	"git.schreifuchs.ch/schreifuchs/schreifuchs.ch/internal/pkg/templer"
	"git.schreifuchs.ch/schreifuchs/schreifuchs.ch/web/pages"
)

const preloadCount = 6

func (h *Handler) gallery(w http.ResponseWriter, r *http.Request) {
	imgs, err := h.srv.GetGallerySet(r.Context())
	if err != nil {
		slog.Error("could not get images", "err", err)
		w.WriteHeader(http.StatusInternalServerError)
		return
	}
	ctx := r.Context()
	for i, image := range imgs.LG.Images {
		if i > preloadCount {
			break
		}
		slog.Info("preloading images", "img", image.UID)
		ctx = templer.AppendHeader(ctx, fmt.Sprintf(`<link rel="preload" href="%s" as="image" />`, image.URL()))
	}

	h.r.Render(ctx, w, r, pages.GallerySet(imgs))
}