import { writable } from "svelte/store";

interface SelectionData {
  path: string,
  hash: string,
}

function createSelectionStore() {
  const {update, set, subscribe} = writable<SelectionData>({
    path: window.location.pathname,
    hash: window.location.hash.slice(1),
  });

  return {
    subscribe,

    refresh() {
      set({
        path: window.location.pathname,
        hash: window.location.hash.slice(1),
      });
    },

    change(key: keyof(SelectionData), value: string) {
      if (key === "hash") {
        window.location.hash = "#" + value;
      }

      update(d => ({...d, [key]: value}));
    },
  }
}

const selectionStore = createSelectionStore();

window.addEventListener("hashchange", () => {
  selectionStore.refresh();
});

export default selectionStore;