// Copyright 2020 The Chromium Authors. All rights reserved.
// 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 Changes from './changes.js';

let loadedChangesModule: (typeof Changes|undefined);

const UIStrings = {
  /**
   * @description Title of the 'Changes' tool in the bottom drawer
   */
  changes: 'Changes',
  /**
   * @description Command for showing the 'Changes' tool in the bottom drawer
   */
  showChanges: 'Show Changes',
  /**
   *@description Title for action in the Changes tool that reverts all changes to the currently open file.
   */
  revertAllChangesToCurrentFile: 'Revert all changes to current file',
  /**
   *@description Title for action in the Changes tool that copies all changes from the currently open file.
   */
  copyAllChangesFromCurrentFile: 'Copy all changes from current file',
};
const str_ = i18n.i18n.registerUIStrings('panels/changes/changes-meta.ts', UIStrings);
const i18nLazyString = i18n.i18n.getLazilyComputedLocalizedString.bind(undefined, str_);

async function loadChangesModule(): Promise<typeof Changes> {
  if (!loadedChangesModule) {
    loadedChangesModule = await import('./changes.js');
  }
  return loadedChangesModule;
}

function maybeRetrieveContextTypes<T = unknown>(getClassCallBack: (changesModule: typeof Changes) => T[]): T[] {
  if (loadedChangesModule === undefined) {
    return [];
  }
  return getClassCallBack(loadedChangesModule);
}

UI.ViewManager.registerViewExtension({
  location: UI.ViewManager.ViewLocationValues.DRAWER_VIEW,
  id: 'changes.changes',
  title: i18nLazyString(UIStrings.changes),
  commandPrompt: i18nLazyString(UIStrings.showChanges),
  persistence: UI.ViewManager.ViewPersistence.CLOSEABLE,
  async loadView() {
    const Changes = await loadChangesModule();
    return new Changes.ChangesView.ChangesView();
  },
});

UI.ActionRegistration.registerActionExtension({
  actionId: 'changes.revert',
  category: UI.ActionRegistration.ActionCategory.CHANGES,
  title: i18nLazyString(UIStrings.revertAllChangesToCurrentFile),
  iconClass: UI.ActionRegistration.IconClass.UNDO,
  async loadActionDelegate() {
    const Changes = await loadChangesModule();
    return new Changes.ChangesView.ActionDelegate();
  },
  contextTypes() {
    return maybeRetrieveContextTypes(Changes => [Changes.ChangesView.ChangesView]);
  },
});

UI.ActionRegistration.registerActionExtension({
  actionId: 'changes.copy',
  category: UI.ActionRegistration.ActionCategory.CHANGES,
  title: i18nLazyString(UIStrings.copyAllChangesFromCurrentFile),
  iconClass: UI.ActionRegistration.IconClass.COPY,
  async loadActionDelegate() {
    const Changes = await loadChangesModule();
    return new Changes.ChangesView.ActionDelegate();
  },
  contextTypes() {
    return maybeRetrieveContextTypes(Changes => [Changes.ChangesView.ChangesView]);
  },
});