// DeQHTTPHandler provides the HTTP endpoint for dequeuing tasks.
type DeQHTTPHandler httpHandler

func (h *DeQHTTPHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	q, ok := mux.Vars(r)["queue"]
	if !ok {
		http.Error(w, "unkown queue", http.StatusBadRequest)
		return
	}

	ctx, cnl := context.WithTimeout(context.Background(), httpTimeout)
	defer cnl()

	d := Deque{
		Queue: Queue(q),
	}
	v, err := h.Hive.Sync(ctx, d)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	if err = json.NewEncoder(w).Encode(v.(Task)); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
}