import Terria from "../Models/Terria";

/**
 * Updates the  {@link Terria} when the window's 'hashchange' event is raised.  This allows new init files and
 * "start=" URLs to be loaded just by changing the hash portion of the URL in the browser's address bar.
 *
 * @param  {Terria} terria The Terria instance to update.
 * @param {Window} window The browser's window DOM object.
 */
export default function (terria: Terria, window: Window) {
  window.addEventListener(
    "hashchange",
    async function () {
      try {
        (
          await terria.updateApplicationUrl(window.location.toString())
        ).throwIfError();
        (await terria.loadInitSources()).throwIfError();
      } catch (e) {
        terria.raiseErrorToUser(e);
      }
    },
    false
  );
}