// Copyright 2017 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 Host from '../../core/host/host.js';
import * as i18n from '../../core/i18n/i18n.js';
import * as UI from '../../ui/legacy/legacy.js';

import {latestReleaseNote, releaseNoteViewId} from './HelpImpl.js';
import releaseNoteStyles from './releaseNote.css.js';

import type {ReleaseNote} from './HelpImpl.js';

const UIStrings = {
  /**
  *@description Text that is usually a hyperlink to more documentation
  */
  learnMore: 'Learn more',
  /**
  *@description Text to close something
  */
  close: 'Close',
};
const str_ = i18n.i18n.registerUIStrings('panels/help/ReleaseNoteView.ts', UIStrings);
const i18nString = i18n.i18n.getLocalizedString.bind(undefined, str_);
let releaseNoteViewInstance: ReleaseNoteView;

export class ReleaseNoteView extends UI.Widget.VBox {
  private readonly releaseNoteElement: Element;
  constructor() {
    super(true);

    this.releaseNoteElement = this.createReleaseNoteElement(latestReleaseNote());
    const topSection = this.contentElement.createChild('div', 'release-note-top-section');
    topSection.textContent = latestReleaseNote().header;
    this.contentElement.appendChild(this.releaseNoteElement);
  }

  static instance(opts: {forceNew: boolean|null} = {forceNew: null}): ReleaseNoteView {
    const {forceNew} = opts;
    if (!releaseNoteViewInstance || forceNew) {
      releaseNoteViewInstance = new ReleaseNoteView();
    }
    return releaseNoteViewInstance;
  }

  elementsToRestoreScrollPositionsFor(): Element[] {
    return [this.releaseNoteElement];
  }

  private createReleaseNoteElement(releaseNote: ReleaseNote): Element {
    const hbox = document.createElement('div');
    hbox.classList.add('hbox');
    const container = hbox.createChild('div', 'release-note-container');
    const contentContainer = container.createChild('ul');
    UI.ARIAUtils.setAccessibleName(contentContainer, latestReleaseNote().header);

    let linkNumber = 1;
    for (const highlight of releaseNote.highlights) {
      const listItem = contentContainer.createChild('li');
      const linkWrapper = UI.XLink.XLink.create(highlight.link, '', 'release-note-link');
      linkWrapper.textContent = '';
      UI.ARIAUtils.markAsLink(linkWrapper);
      UI.ARIAUtils.setAccessibleName(
          linkWrapper, `${highlight.title}: ${highlight.subtitle} ${linkNumber} of ${releaseNote.highlights.length}`);

      const title = linkWrapper.createChild('div', 'release-note-title');
      title.textContent = highlight.title;

      const subtitle = linkWrapper.createChild('div', 'release-note-subtitle');
      subtitle.textContent = highlight.subtitle;

      listItem.appendChild(linkWrapper);
      linkNumber++;
    }

    const actionContainer = container.createChild('div', 'release-note-action-container');
    const learnMore = UI.UIUtils.createTextButton(i18nString(UIStrings.learnMore), event => {
      event.consume(true);
      Host.InspectorFrontendHost.InspectorFrontendHostInstance.openInNewTab(releaseNote.link);
    });
    UI.ARIAUtils.markAsLink(learnMore);
    actionContainer.appendChild(learnMore);

    actionContainer.appendChild(UI.UIUtils.createTextButton(i18nString(UIStrings.close), event => {
      event.consume(true);
      UI.InspectorView.InspectorView.instance().closeDrawerTab(releaseNoteViewId, true);
    }, 'close-release-note'));

    const imageLink = UI.XLink.XLink.create(releaseNote.link, ' ') as HTMLElement;
    imageLink.classList.add('release-note-image');
    const tooltipText = latestReleaseNote().header;
    UI.Tooltip.Tooltip.install(imageLink, tooltipText);

    hbox.appendChild(imageLink);
    const image = imageLink.createChild('img') as HTMLImageElement;
    image.src = new URL('../../Images/whatsnew.avif', import.meta.url).toString();
    UI.Tooltip.Tooltip.install(image, tooltipText);
    image.alt = tooltipText;

    return hbox;
  }
  wasShown(): void {
    super.wasShown();
    this.registerCSSFiles([releaseNoteStyles]);
  }
}