// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import * as i18n from '../../core/i18n/i18n.js';
import * as UI from '../../ui/legacy/legacy.js';

import type * as Layers from './layers.js';

const UIStrings = {
  /**
   * @description Title of the Layers tool
   */
  layers: 'Layers',
  /**
   * @description Command for showing the Layers tool
   */
  showLayers: 'Show Layers',
} as const;
const str_ = i18n.i18n.registerUIStrings('panels/layers/layers-meta.ts', UIStrings);
const i18nLazyString = i18n.i18n.getLazilyComputedLocalizedString.bind(undefined, str_);

let loadedLayersModule: (typeof Layers|undefined);

async function loadLayersModule(): Promise<typeof Layers> {
  if (!loadedLayersModule) {
    loadedLayersModule = await import('./layers.js');
  }
  return loadedLayersModule;
}

UI.ViewManager.registerViewExtension({
  location: UI.ViewManager.ViewLocationValues.PANEL,
  id: 'layers',
  title: i18nLazyString(UIStrings.layers),
  commandPrompt: i18nLazyString(UIStrings.showLayers),
  order: 100,
  persistence: UI.ViewManager.ViewPersistence.CLOSEABLE,
  async loadView() {
    const Layers = await loadLayersModule();
    return Layers.LayersPanel.LayersPanel.instance();
  },
});