// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import '../../ui/legacy/components/inline_editor/inline_editor.js';
import '../../ui/components/report_view/report_view.js';

import * as Common from '../../core/common/common.js';
import * as Host from '../../core/host/host.js';
import * as i18n from '../../core/i18n/i18n.js';
import * as Platform from '../../core/platform/platform.js';
import * as SDK from '../../core/sdk/sdk.js';
import type * as Protocol from '../../generated/protocol.js';
import * as Buttons from '../../ui/components/buttons/buttons.js';
import * as Components from '../../ui/legacy/components/utils/utils.js';
import * as UI from '../../ui/legacy/legacy.js';
import {Directives, html, i18nTemplate, type LitTemplate, nothing, render} from '../../ui/lit/lit.js';
import * as VisualLogging from '../../ui/visual_logging/visual_logging.js';

import appManifestViewStyles from './appManifestView.css.js';
import * as ApplicationComponents from './components/components.js';

const {styleMap, classMap, ref} = Directives;
const {linkifyURL} = Components.Linkifier.Linkifier;
const {widget} = UI.Widget;

const UIStrings = {
  /**
   * @description Text in App Manifest View of the Application panel
   */
  noManifestDetected: 'No manifest detected',
  /**
   * @description Description text on manifests in App Manifest View of the Application panel which describes the app manifest view tab
   */
  manifestDescription:
      'A manifest defines how your app appears on phone’s home screens and what the app looks like on launch.',
  /**
   * @description Text in App Manifest View of the Application panel
   */
  appManifest: 'Manifest',
  /**
   * @description Text in App Manifest View of the Application panel
   */
  errorsAndWarnings: 'Errors and warnings',
  /**
   * @description Text in App Manifest View of the Application panel
   */
  installability: 'Installability',
  /**
   * @description Text in App Manifest View of the Application panel
   */
  identity: 'Identity',
  /**
   * @description Text in App Manifest View of the Application panel
   */
  presentation: 'Presentation',
  /**
   * @description Text in App Manifest View of the Application panel
   */
  protocolHandlers: 'Protocol Handlers',
  /**
   * @description Text in App Manifest View of the Application panel
   */
  icons: 'Icons',
  /**
   * @description Text in App Manifest View of the Application panel
   */
  windowControlsOverlay: 'Window Controls Overlay',
  /**
   * @description Label in the App Manifest View for the "name" property of web app or shortcut item
   */
  name: 'Name',
  /**
   * @description Label in the App Manifest View for the "short_name" property of web app or shortcut item
   */
  shortName: 'Short name',
  /**
   * @description Label in the App Manifest View for the "url" property of shortcut item
   */
  url: 'URL',
  /**
   * @description Label in the App Manifest View for the Computed App Id
   */
  computedAppId: 'Computed App ID',
  /**
   * @description Popup-text explaining what the App Id is used for.
   */
  appIdExplainer:
      'This is used by the browser to know whether the manifest should be updating an existing application, or whether it refers to a new web app that can be installed.',
  /**
   * @description Text which is a hyperlink to more documentation
   */
  learnMore: 'Learn more',
  /**
   * @description Explanation why it is advisable to specify an 'id' field in the manifest.
   * @example {/index.html} PH1
   * @example {(button for copying suggested value into clipboard)} PH2
   */
  appIdNote:
      'Note: `id` is not specified in the manifest, `start_url` is used instead. To specify an App ID that matches the current identity, set the `id` field to {PH1} {PH2}.',

  /**
   * @description Tooltip text that appears when hovering over a button which copies the previous text to the clipboard.
   */
  copyToClipboard: 'Copy suggested ID to clipboard',
  /**
   * @description Screen reader announcement string when the user clicks the copy to clipboard button.
   * @example {/index.html} PH1
   */
  copiedToClipboard: 'Copied suggested ID {PH1} to clipboard',
  /**
   * @description Label in the App Manifest View for the "description" property of web app or shortcut item
   */
  description: 'Description',
  /**
   * @description Text in App Manifest View of the Application panel
   */
  startUrl: 'Start URL',
  /**
   * @description Text in App Manifest View of the Application panel
   */
  themeColor: 'Theme color',
  /**
   * @description Text in App Manifest View of the Application panel
   */
  backgroundColor: 'Background color',
  /**
   * @description Text for the orientation of something
   */
  orientation: 'Orientation',
  /**
   * @description Title of the display attribute in App Manifest View of the Application panel
   * The display attribute defines the preferred display mode for the app such fullscreen or
   * standalone.
   * For more details see https://www.w3.org/TR/appmanifest/#display-member.
   */
  display: 'Display',
  /**
   * @description Title of the new_note_url attribute in the Application panel
   */
  newNoteUrl: 'New note URL',
  /**
   * @description Text in App Manifest View of the Application panel
   */
  descriptionMayBeTruncated: 'Description may be truncated.',
  /**
   * @description Warning text about too many shortcuts
   */
  shortcutsMayBeNotAvailable:
      'The maximum number of shortcuts is platform dependent. Some shortcuts may be not available.',
  /**
   * @description Text in App Manifest View of the Application panel
   */
  showOnlyTheMinimumSafeAreaFor: 'Show only the minimum safe area for maskable icons',
  /**
   * @description Link text for more information on maskable icons in App Manifest view of the Application panel
   */
  documentationOnMaskableIcons: 'documentation on maskable icons',
  /**
   * @description Text wrapping a link pointing to more information on maskable icons in App Manifest view of the Application panel
   * @example {https://web.dev/maskable-icon/} PH1
   */
  needHelpReadOurS: 'Need help? Read the {PH1}.',
  /**
   * @description Text in App Manifest View of the Application panel
   * @example {1} PH1
   */
  shortcutS: 'Shortcut #{PH1}',
  /**
   * @description Text in App Manifest View of the Application panel
   * @example {1} PH1
   */
  shortcutSShouldIncludeAXPixel: 'Shortcut #{PH1} should include a 96×96 pixel icon',
  /**
   * @description Text in App Manifest View of the Application panel
   * @example {1} PH1
   */
  screenshotS: 'Screenshot #{PH1}',
  /**
   * @description Manifest installability error in the Application panel
   */
  pageIsNotLoadedInTheMainFrame: 'Page is not loaded in the main frame',
  /**
   * @description Manifest installability error in the Application panel
   */
  pageIsNotServedFromASecureOrigin: 'Page is not served from a secure origin',
  /**
   * @description Manifest installability error in the Application panel
   */
  pageHasNoManifestLinkUrl: 'Page has no manifest <link> `URL`',
  /**
   * @description Manifest installability error in the Application panel
   */
  manifestCouldNotBeFetchedIsEmpty: 'Manifest could not be fetched, is empty, or could not be parsed',
  /**
   * @description Manifest installability error in the Application panel
   */
  manifestStartUrlIsNotValid: 'Manifest \'`start_url`\' is not valid',
  /**
   * @description Manifest installability error in the Application panel
   */
  manifestDoesNotContainANameOr: 'Manifest does not contain a \'`name`\' or \'`short_name`\' field',
  /**
   * @description Manifest installability error in the Application panel
   */
  manifestDisplayPropertyMustBeOne:
      'Manifest \'`display`\' property must be one of \'`standalone`\', \'`fullscreen`\', or \'`minimal-ui`\'',
  /**
   * @description Manifest installability error in the Application panel
   * @example {100} PH1
   */
  manifestDoesNotContainASuitable:
      'Manifest does not contain a suitable icon—PNG, SVG, or WebP format of at least {PH1}px is required, the \'`sizes`\' attribute must be set, and the \'`purpose`\' attribute, if set, must include \'`any`\'.',
  /**
   * @description Manifest installability error in the Application panel
   */
  avoidPurposeAnyAndMaskable:
      'Declaring an icon with \'`purpose`\' of \'`any maskable`\' is discouraged. It is likely to look incorrect on some platforms due to too much or too little padding.',
  /**
   * @description Manifest installability error in the Application panel
   * @example {100} PH1
   */
  noSuppliedIconIsAtLeastSpxSquare:
      'No supplied icon is at least {PH1} pixels square in `PNG`, `SVG`, or `WebP` format, with the purpose attribute unset or set to \'`any`\'.',
  /**
   * @description Manifest installability error in the Application panel
   */
  couldNotDownloadARequiredIcon: 'Could not download a required icon from the manifest',
  /**
   * @description Manifest installability error in the Application panel
   */
  downloadedIconWasEmptyOr: 'Downloaded icon was empty or corrupted',
  /**
   * @description Manifest installability error in the Application panel
   */
  theSpecifiedApplicationPlatform: 'The specified application platform is not supported on Android',
  /**
   * @description Manifest installability error in the Application panel
   */
  noPlayStoreIdProvided: 'No Play store ID provided',
  /**
   * @description Manifest installability error in the Application panel
   */
  thePlayStoreAppUrlAndPlayStoreId: 'The Play Store app URL and Play Store ID do not match',
  /**
   * @description Manifest installability error in the Application panel
   */
  theAppIsAlreadyInstalled: 'The app is already installed',
  /**
   * @description Manifest installability error in the Application panel
   */
  aUrlInTheManifestContainsA: 'A URL in the manifest contains a username, password, or port',
  /**
   * @description Manifest installability error in the Application panel
   */
  pageIsLoadedInAnIncognitoWindow: 'Page is loaded in an incognito window',
  /**
   * @description Manifest installability error in the Application panel
   */
  pageDoesNotWorkOffline: 'Page does not work offline',
  /**
   * @description Manifest installability error in the Application panel
   */
  couldNotCheckServiceWorker: 'Could not check `service worker` without a \'`start_url`\' field in the manifest',
  /**
   * @description Manifest installability error in the Application panel
   */
  manifestSpecifies: 'Manifest specifies \'`prefer_related_applications`: true\'',
  /**
   * @description Manifest installability error in the Application panel
   */
  preferrelatedapplicationsIsOnly:
      '\'`prefer_related_applications`\' is only supported on `Chrome` Beta and Stable channels on `Android`.',
  /**
   * @description Manifest installability error in the Application panel
   */
  manifestContainsDisplayoverride:
      'Manifest contains \'`display_override`\' field, and the first supported display mode must be one of \'`standalone`\', \'`fullscreen`\', or \'`minimal-ui`\'',
  /**
   * @description Warning message for offline capability check
   * @example {https://developer.chrome.com/blog/improved-pwa-offline-detection} PH1
   */
  pageDoesNotWorkOfflineThePage:
      'Page does not work offline. Starting in Chrome 93, the installability criteria are changing, and this site will not be installable. See {PH1} for more information.',
  /**
   * @description Text to indicate the source of an image
   * @example {example.com} PH1
   */
  imageFromS: 'Image from {PH1}',
  /**
   * @description Text for one or a group of screenshots
   */
  screenshot: 'Screenshot',
  /**
   * @description Label in the App Manifest View for the "form_factor" property of screenshot
   */
  formFactor: 'Form factor',
  /**
   * @description Label in the App Manifest View for the "label" property of screenshot
   */
  label: 'Label',
  /**
   * @description Label in the App Manifest View for the "platform" property of screenshot
   */
  platform: 'Platform',
  /**
   * @description Text in App Manifest View of the Application panel
   */
  icon: 'Icon',
  /**
   * @description This is a warning message telling the user about a problem where the src attribute
   * of an image has not be entered/provided correctly. 'src' is part of the DOM API and should not
   * be translated.
   * @example {ImageName} PH1
   */
  sSrcIsNotSet: '{PH1} \'`src`\' is not set',
  /**
   * @description Warning message for image resources from the manifest
   * @example {Screenshot} PH1
   * @example {https://example.com/image.png} PH2
   */
  sUrlSFailedToParse: '{PH1} URL \'\'{PH2}\'\' failed to parse',
  /**
   * @description Warning message for image resources from the manifest
   * @example {Image} PH1
   * @example {https://example.com/image.png} PH2
   */
  sSFailedToLoad: '{PH1} {PH2} failed to load',
  /**
   * @description Warning message for image resources from the manifest
   * @example {Image} PH1
   * @example {https://example.com/image.png} PH2
   */
  sSDoesNotSpecifyItsSizeInThe: '{PH1} {PH2} does not specify its size in the manifest',
  /**
   * @description Warning message for image resources from the manifest
   * @example {Image} PH1
   * @example {https://example.com/image.png} PH2
   */
  sSShouldSpecifyItsSizeAs: '{PH1} {PH2} should specify its size as `[width]x[height]`',
  /**
   * @description Warning message for image resources from the manifest
   */
  sSShouldHaveSquareIcon:
      'Most operating systems require square icons. Please include at least one square icon in the array.',
  /**
   * @description Warning message for image resources from the manifest
   * @example {100} PH1
   * @example {100} PH2
   * @example {Image} PH3
   * @example {https://example.com/image.png} PH4
   * @example {200} PH5
   * @example {200} PH6
   */
  actualSizeSspxOfSSDoesNotMatch:
      'Actual size ({PH1}×{PH2})px of {PH3} {PH4} does not match specified size ({PH5}×{PH6}px)',
  /**
   * @description Warning message for image resources from the manifest
   * @example {100} PH1
   * @example {Image} PH2
   * @example {https://example.com/image.png} PH3
   * @example {200} PH4
   */
  actualWidthSpxOfSSDoesNotMatch: 'Actual width ({PH1}px) of {PH2} {PH3} does not match specified width ({PH4}px)',
  /**
   * @description Warning message for image resources from the manifest
   * @example {100} PH1
   * @example {Image} PH2
   * @example {https://example.com/image.png} PH3
   * @example {100} PH4
   */
  actualHeightSpxOfSSDoesNotMatch: 'Actual height ({PH1}px) of {PH2} {PH3} does not match specified height ({PH4}px)',
  /**
   * @description Warning message for image resources from the manifest
   * @example {Image} PH1
   * @example {https://example.com/image.png} PH2
   */
  sSSizeShouldBeAtLeast320: '{PH1} {PH2} size should be at least 320×320',
  /**
   * @description Warning message for image resources from the manifest
   * @example {Image} PH1
   * @example {https://example.com/image.png} PH2
   */
  sSSizeShouldBeAtMost3840: '{PH1} {PH2} size should be at most 3840×3840',
  /**
   * @description Warning message for image resources from the manifest
   * @example {Image} PH1
   * @example {https://example.com/image.png} PH2
   */
  sSWidthDoesNotComplyWithRatioRequirement: '{PH1} {PH2} width can\'t be more than 2.3 times as long as the height',
  /**
   * @description Warning message for image resources from the manifest
   * @example {Image} PH1
   * @example {https://example.com/image.png} PH2
   */
  sSHeightDoesNotComplyWithRatioRequirement: '{PH1} {PH2} height can\'t be more than 2.3 times as long as the width',
  /**
   * @description Manifest installability error in the Application panel
   * @example {https://example.com/image.png} url
   */
  screenshotPixelSize:
      'Screenshot {url} should specify a pixel size `[width]x[height]` instead of `any` as first size.',
  /**
   * @description Warning text about screenshots for Richer PWA Install UI on desktop
   */
  noScreenshotsForRicherPWAInstallOnDesktop:
      'Richer PWA Install UI won’t be available on desktop. Please add at least one screenshot with the `form_factor` set to `wide`.',
  /**
   * @description Warning text about screenshots for Richer PWA Install UI on mobile
   */
  noScreenshotsForRicherPWAInstallOnMobile:
      'Richer PWA Install UI won’t be available on mobile. Please add at least one screenshot for which `form_factor` is not set or set to a value other than `wide`.',
  /**
   * @description Warning text about too many screenshots for desktop
   */
  tooManyScreenshotsForDesktop: 'No more than 8 screenshots will be displayed on desktop. The rest will be ignored.',
  /**
   * @description Warning text about too many screenshots for mobile
   */
  tooManyScreenshotsForMobile: 'No more than 5 screenshots will be displayed on mobile. The rest will be ignored.',
  /**
   * @description Warning text about not all screenshots matching the appropriate form factor have the same aspect ratio
   */
  screenshotsMustHaveSameAspectRatio:
      'All screenshots with the same `form_factor` must have the same aspect ratio as the first screenshot with that `form_factor`. Some screenshots will be ignored.',
  /**
   * @description Message for Window Controls Overlay value succsessfully found with links to documnetation
   * @example {window-controls-overlay} PH1
   * @example {https://developer.mozilla.org/en-US/docs/Web/Manifest/display_override} PH2
   * @example {https://developer.mozilla.org/en-US/docs/Web/Manifest} PH3
   */
  wcoFound: 'Chrome has successfully found the {PH1} value for the {PH2} field in the {PH3}.',
  /**
   * @description Message for Windows Control Overlay value not found with link to documentation
   * @example {https://developer.mozilla.org/en-US/docs/Web/Manifest/display_override} PH1
   */
  wcoNotFound:
      'Define {PH1} in the manifest to use the Window Controls Overlay API and customize your app\'s title bar.',
  /**
   * @description Link text for more information on customizing Window Controls Overlay title bar in the Application panel
   */
  customizePwaTitleBar: 'Customize the window controls overlay of your PWA\'s title bar',
  /**
   * @description Text wrapping link to documentation on how to customize WCO title bar
   * @example {https://learn.microsoft.com/en-us/microsoft-edge/progressive-web-apps-chromium/how-to/window-controls-overlay} PH1
   */
  wcoNeedHelpReadMore: 'Need help? Read {PH1}.',
  /**
   * @description Text for emulation OS selection dropdown
   */
  selectWindowControlsOverlayEmulationOs: 'Emulate the Window Controls Overlay on',
  /**
   * @description Alert message for screen reader to announce which subsection is being scrolled to
   * @example {"Identity"} PH1
   */
  onInvokeAlert: 'Scrolled to {PH1}',
} as const;
const str_ = i18n.i18n.registerUIStrings('panels/application/AppManifestView.ts', UIStrings);
const i18nString = i18n.i18n.getLocalizedString.bind(undefined, str_);

export type ParsedSize = {
  any: 'any',
  formatted: string,
}|{
  width: number,
  height: number,
  formatted: string,
};

interface Screenshot {
  src: string;
  type?: string;
  sizes?: string;
  label?: string;
  form_factor?: string;  // eslint-disable-line @typescript-eslint/naming-convention
  platform?: string;
}

/* eslint-disable @typescript-eslint/naming-convention */
interface Manifest {
  background_color?: string;
  description?: string;
  display?: string;
  display_override?: string[];
  icons?: Array<{
    src: string,
    sizes?: string,
    type?: string,
    purpose?: string,
  }>;
  id?: string;
  name?: string;
  note_taking?: {
    new_note_url?: string,
  };
  orientation?: string;
  protocol_handlers?: Protocol.Page.ProtocolHandler[];
  screenshots?: Screenshot[];
  short_name?: string;
  shortcuts?: Array<{
    name: string,
    url: string,
    description?: string,
    short_name?: string,
    icons?: Array<{
           src: string,
           sizes?: string,
           type?: string,
           purpose?: string,
         }>,
  }>;
  start_url?: string;
  theme_color?: string;
}
/* eslint-enable @typescript-eslint/naming-convention */

interface IdentitySectionData {
  name: string;
  shortName: string;
  description: string;
  appId: string|null;
  recommendedId: string|null;
  hasId: boolean;
  warnings: Platform.UIString.LocalizedString[];
}

interface PresentationSectionData {
  startUrl: string;
  completeStartUrl: Platform.DevToolsPath.UrlString|null;
  themeColor: Common.Color.Color|null;
  backgroundColor: Common.Color.Color|null;
  orientation: string;
  display: string;
  newNoteUrl?: string;
  hasNewNoteUrl: boolean;
  completeNewNoteUrl: Platform.DevToolsPath.UrlString|null;
}

interface ProtocolHandlersSectionData {
  protocolHandlers: Protocol.Page.ProtocolHandler[];
  manifestLink: Platform.DevToolsPath.UrlString;
}

interface IconsSectionData {
  icons: Map<string, ProcessedImageResource[]>;
  imageResourceErrors: Platform.UIString.LocalizedString[];
}

interface ProcessedShortcut {
  name: string;
  shortName?: string;
  description?: string;
  url: string;
  shortcutUrl: Platform.DevToolsPath.UrlString;
  icons: Map<string, ProcessedImageResource[]>;
}

interface ShortcutsSectionData {
  shortcuts: ProcessedShortcut[];
  warnings: Platform.UIString.LocalizedString[];
  imageResourceErrors: Platform.UIString.LocalizedString[];
}

interface ProcessedScreenshot {
  screenshot: Screenshot;
  processedImage: ProcessedImageResource;
}

interface ScreenshotsSectionData {
  screenshots: ProcessedScreenshot[];
  warnings: Platform.UIString.LocalizedString[];
  imageResourceErrors: Platform.UIString.LocalizedString[];
}

interface WindowControlsSectionData {
  hasWco: boolean;
  themeColor: string;
  wcoStyleSheetText: boolean;
  url: Platform.DevToolsPath.UrlString;
}

type ProcessedImageResource = {
  imageResourceErrors: Platform.UIString.LocalizedString[],
  imageUrl?: string,
  squareSizedIconAvailable?: boolean,
}|{
  imageResourceErrors: Platform.UIString.LocalizedString[],
  imageUrl: string,
  squareSizedIconAvailable: boolean,
  title: string,
  naturalWidth: number,
  naturalHeight: number,
  imageSrc: string,
};

function renderSectionHeader(text: Platform.UIString.LocalizedString, output?: ViewOutput): LitTemplate {
  // clang-format off
  return html`
    <devtools-report-section-header
        ${ref(e => { if (output && e instanceof HTMLElement) {
            output.scrollToSection.set(text, () => { e.scrollIntoView(); });
          }})}>
      ${text}
    </devtools-report-section-header>`;
  // clang-format on
}

function renderErrors(
    warnings?: Platform.UIString.LocalizedString[], manifestErrors?: Protocol.Page.AppManifestError[],
    imageErrors?: Platform.UIString.LocalizedString[], output?: ViewOutput): LitTemplate {
  // clang-format off
  return html`
    ${renderSectionHeader(i18nString(UIStrings.errorsAndWarnings), output)}
    <div class="report-section" jslog=${VisualLogging.section('errors-and-warnings')}>
      ${manifestErrors?.map(error => html`<div class="report-row">
          <devtools-icon
          name=${error.critical ? 'cross-circle-filled' : 'warning-filled'}
          style=${styleMap({color: error.critical ? 'var(--icon-error)' : 'var(--icon-warning)'})}>
        </devtools-icon>
        ${error.message}</div>
      `)}
      ${warnings?.map(warning => html`<div class="report-row">${warning}</div>`)}
      ${imageErrors?.map(error => html`<div class="report-row">${error}</div>`)}
    </div>`;
  // clang-format on
}

function renderIdentity(identityData: IdentitySectionData, onCopy: () => void, output: ViewOutput): LitTemplate {
  const {name, shortName, description, appId, recommendedId, hasId} = identityData;
  // clang-format off
  return html`${renderSectionHeader(i18nString(UIStrings.identity), output)}
  <div class="report-section" jslog=${VisualLogging.section('identity')}>
    <devtools-report-key>${i18nString(UIStrings.name)}</devtools-report-key>
    <devtools-report-value>${name}</devtools-report-value>
    <devtools-report-key>${i18nString(UIStrings.shortName)}</devtools-report-key>
    <devtools-report-value>${shortName}</devtools-report-value>
    <devtools-report-key>${i18nString(UIStrings.description)}</devtools-report-key>
    <devtools-report-value>${description}</devtools-report-value>
    ${appId && recommendedId ? html`
      <devtools-report-key aria-label="App Id">${i18nString(UIStrings.computedAppId)}</devtools-report-key>
      <devtools-report-value jslog=${VisualLogging.section('identity')}>
        ${appId}
        <devtools-icon class="inline-icon" name="help" title=${i18nString(UIStrings.appIdExplainer)}
            jslog=${VisualLogging.action('help').track({hover: true})}>
        </devtools-icon>
        <devtools-link href="https://developer.chrome.com/blog/pwa-manifest-id/"
                      jslogcontext="learn-more"
                      ${ref(setFocusOnSection(i18nString(UIStrings.identity), output))}>
          ${i18nString(UIStrings.learnMore)}
        </devtools-link>
        ${!hasId ? html`
          <div class="multiline-value">
            ${i18nTemplate(str_, UIStrings.appIdNote, {
              PH1: html`<code>${recommendedId}</code>`,
              PH2: html`<devtools-button class="inline-button" @click=${onCopy}
                          .iconName=${'copy'}
                          .variant=${Buttons.Button.Variant.ICON}
                          .size=${Buttons.Button.Size.SMALL}
                          .jslogContext=${'manifest.copy-id'}
                          .title=${i18nString(UIStrings.copyToClipboard)}>
                        </devtools-button>`,
            })}
        </div>` : nothing}
      </devtools-report-value>` : nothing}
    </div>`;
  // clang-format on
}

function renderPresentation(presentationData: PresentationSectionData, output: ViewOutput): LitTemplate {
  const {
    startUrl,
    completeStartUrl,
    themeColor,
    backgroundColor,
    orientation,
    display,
    newNoteUrl,
    hasNewNoteUrl,
    completeNewNoteUrl,
  } = presentationData;
  // clang-format off
  return html`${renderSectionHeader(i18nString(UIStrings.presentation), output)}
    <div class="report-section" jslog=${VisualLogging.section('presentation')}>
      <devtools-report-key>${i18nString(UIStrings.startUrl)}</devtools-report-key>
      <devtools-report-value>
      ${completeStartUrl ? (() => {
          const link = linkifyURL(completeStartUrl, {text: startUrl, tabStop: true, jslogContext: 'start-url'});
          output.focusOnSection.set(i18nString(UIStrings.presentation), () => link.focus());
          return link;
        })() : nothing}
      </devtools-report-value>
      <devtools-report-key>${i18nString(UIStrings.themeColor)}</devtools-report-key>
      <devtools-report-value>${themeColor
        ? html`<devtools-color-swatch .color=${themeColor}></devtools-color-swatch>`
        : nothing}
      </devtools-report-value>
      <devtools-report-key>${i18nString(UIStrings.backgroundColor)}</devtools-report-key>
      <devtools-report-value>${backgroundColor
        ? html`<devtools-color-swatch .color=${backgroundColor}></devtools-color-swatch>`
        : nothing}
      </devtools-report-value>
      <devtools-report-key>${i18nString(UIStrings.orientation)}</devtools-report-key>
      <devtools-report-value>${orientation}</devtools-report-value>
      <devtools-report-key>${i18nString(UIStrings.display)}</devtools-report-key>
      <devtools-report-value>${display}</devtools-report-value>
      ${completeNewNoteUrl ? html`
        <devtools-report-key>${i18nString(UIStrings.newNoteUrl)}</devtools-report-key>
        <devtools-report-value>${hasNewNoteUrl
          ? linkifyURL(completeNewNoteUrl, {text: newNoteUrl, tabStop: true})
          : nothing}
        </devtools-report-value>
      ` : nothing}
    </div>
  `;
  // clang-format on
}

function renderProtocolHandlers(data: ProtocolHandlersSectionData, output: ViewOutput): LitTemplate {
  // clang-format off
  return html`${renderSectionHeader(i18nString(UIStrings.protocolHandlers), output)}
    <div class="report-row">
      <devtools-widget ${widget(
        ApplicationComponents.ProtocolHandlersView.ProtocolHandlersView,
        {protocolHandlers: data.protocolHandlers, manifestLink: data.manifestLink})}
        ${ref(setFocusOnSection(i18nString(UIStrings.protocolHandlers), output))}>
      </devtools-widget>
    </div>
    <devtools-report-divider></devtools-report-divider>`;
  // clang-format on
}

function renderImage(imageSrc: string, imageUrl: string, naturalWidth: number): LitTemplate {
  // clang-format off
  return html`
    <div class="image-wrapper">
      <img src=${imageSrc} alt=${i18nString(UIStrings.imageFromS, {PH1: imageUrl})}
          width=${naturalWidth}>
    </div>`;
  // clang-format on
}

function setFocusOnSection(section: Platform.UIString.LocalizedString, output: ViewOutput): (e: Element|undefined) =>
    void {
  return (e: Element|undefined) => {
    if (e instanceof HTMLElement) {
      output.focusOnSection.set(section, () => e.focus());
    }
  };
}

function renderIcons(
    data: IconsSectionData, maskedIcons: boolean, onToggleIconMasked: (value: boolean) => void,
    output: ViewOutput): LitTemplate {
  // clang-format off
  return html`${renderSectionHeader(i18nString(UIStrings.icons), output)}
    <div class="report-section" jslog=${VisualLogging.section('icons')}>
      <div class="report-row">
        <devtools-checkbox class="mask-checkbox"
            jslog=${VisualLogging.toggle('show-minimal-safe-area-for-maskable-icons')
                                  .track({change: true})}
            @click=${(event: Event) => onToggleIconMasked((event.target as HTMLInputElement).checked)}
            ${ref(setFocusOnSection(i18nString(UIStrings.icons), output))}>
          ${i18nString(UIStrings.showOnlyTheMinimumSafeAreaFor)}
        </devtools-checkbox>
      </div>
      <div class="report-row">
        ${i18nTemplate(str_, UIStrings.needHelpReadOurS, {
          PH1: html`
            <devtools-link href="https://web.dev/maskable-icon/" jslogcontext="learn-more">
              ${i18nString(UIStrings.documentationOnMaskableIcons)}
            </devtools-link>`,
        })}
      </div>
      ${Array.from(data.icons).map(([title, images]: [string, ProcessedImageResource[]]) => {
        return html`
        <devtools-report-key>${title}</devtools-report-key>
        <devtools-report-value class=${classMap({'show-mask': Boolean(maskedIcons)})}>
          ${images.filter(icon => 'imageSrc' in icon)
              .map(icon => renderImage(icon.imageSrc, icon.imageUrl, icon.naturalWidth))}
        </devtools-report-value>
      `;})}
    </div>`;
  // clang-format on
}

function renderShortcuts(data: ShortcutsSectionData): LitTemplate {
  // clang-format off
  return html`${data.shortcuts.map((shortcut, index) => html`
    ${renderSectionHeader(i18nString(UIStrings.shortcutS, {PH1: index + 1}))}
    <div class="report-section" jslog=${VisualLogging.section('shortcuts')}>
      <devtools-report-key>${i18nString(UIStrings.name)}</devtools-report-key>
      <devtools-report-value>${shortcut.name}</devtools-report-value>
      ${shortcut.shortName ? html`
        <devtools-report-key>${i18nString(UIStrings.shortName)}</devtools-report-key>
        <devtools-report-value>${shortcut.shortName}</devtools-report-value>
      ` : nothing}
      ${shortcut.description ? html`
        <devtools-report-key>${i18nString(UIStrings.description)}</devtools-report-key>
        <devtools-report-value>${shortcut.description}</devtools-report-value>
      ` : nothing}
      <devtools-report-key>${i18nString(UIStrings.url)}</devtools-report-key>
      <devtools-report-value>
        ${linkifyURL(shortcut.shortcutUrl, {text: shortcut.url, tabStop: true, jslogContext: 'shortcut'})}
      </devtools-report-value>
      ${Array.from(shortcut.icons).map(([title, images]) => html`
        <devtools-report-key>${title}</devtools-report-key>
        <devtools-report-value>
          ${images.filter(icon => 'imageSrc' in icon)
            .map(icon => renderImage(icon.imageSrc, icon.imageUrl, icon.naturalWidth))}
        </devtools-report-value>
      `)}
    </div>`)}`;
  // clang-format on
}

function renderScreenshots(data: ScreenshotsSectionData): LitTemplate {
  // clang-format off
  return html`${data.screenshots.map(({screenshot, processedImage}, index) => html`
    ${renderSectionHeader(i18nString(UIStrings.screenshotS, {PH1: index + 1}))}
    <div class="report-section" jslog=${VisualLogging.section('screenshots')}>
      ${screenshot.form_factor
        ? html`<devtools-report-key>${i18nString(UIStrings.formFactor)}</devtools-report-key>
          <devtools-report-value>${screenshot.form_factor}</devtools-report-value>`
        : nothing}
      ${screenshot.label
        ? html`<devtools-report-key>${i18nString(UIStrings.label)}</devtools-report-key>
          <devtools-report-value>${screenshot.label}</devtools-report-value>`
        : nothing}
      ${screenshot.platform
        ? html`<devtools-report-key>${i18nString(UIStrings.platform)}</devtools-report-key>
          <devtools-report-value>${screenshot.platform}</devtools-report-value>`
        : nothing}
      ${'imageSrc' in processedImage ? html`
        <devtools-report-key>${processedImage.title}</devtools-report-key>
        <devtools-report-value>
          ${renderImage(processedImage.imageSrc, processedImage.imageUrl, processedImage.naturalWidth)}
        </devtools-report-value>`
        : nothing}
    </div>
  `)}`;
  // clang-format on
}

function renderInstallability(installabilityErrors: Protocol.Page.InstallabilityError[]): LitTemplate {
  return html`${renderSectionHeader(i18nString(UIStrings.installability))}
    ${getInstallabilityErrorMessages(installabilityErrors).map(content => html`
      <div class="report-row">
        ${content}
      </div>
    `)}`;
}

function renderWindowControlsSection(
    data: WindowControlsSectionData, selectedPlatform: string|undefined,
    onSelectOs: ((selectedOS: SDK.OverlayModel.EmulatedOSType) => Promise<void>)|undefined,
    onToggleWcoToolbar: ((enabled: boolean) => Promise<void>)|undefined, output: ViewOutput): LitTemplate {
  // clang-format off
  return html`
    ${renderSectionHeader(i18nString(UIStrings.windowControlsOverlay), output)}
    <div class="report-section" jslog=${VisualLogging.section('window-controls-overlay')}>
      ${data?.hasWco && output ? html`
        <div class="report-row">
          <devtools-icon class="inline-icon" name="check-circle"></devtools-icon>
          ${i18nTemplate(str_, UIStrings.wcoFound, {
            PH1: html`<code class="wco">window-controls-overlay</code>`,
            PH2: html`<code>
              <devtools-link
                href="https://developer.mozilla.org/en-US/docs/Web/Manifest/display_override"
                jslogcontext="display-override"
                ${ref(setFocusOnSection(i18nString(UIStrings.windowControlsOverlay), output))}>
                display-override
              </devtools-link>
            </code>`,
            PH3: html`${Components.Linkifier.Linkifier.linkifyURL(data.url)}`,
          })}
        </div>
        ${selectedPlatform && onSelectOs && onToggleWcoToolbar ?
            renderWindowControls(selectedPlatform, onSelectOs, onToggleWcoToolbar) :
            nothing}` : html`
          <div class="report-row">
            <devtools-icon class="inline-icon" name="info"></devtools-icon>
            ${i18nTemplate(str_, UIStrings.wcoNotFound, {PH1: html`<code>
                <devtools-link
                    href="https://developer.mozilla.org/en-US/docs/Web/Manifest/display_override"
                    jslogcontext="display-override"
                    ${ref(setFocusOnSection(i18nString(UIStrings.windowControlsOverlay), output))}>
                  display-override
                </devtools-link>
              </code>`})}
          </div>`}
        <div class="report-row">
          ${i18nTemplate(str_, UIStrings.wcoNeedHelpReadMore, {PH1: html`<devtools-link
              href="https://learn.microsoft.com/en-us/microsoft-edge/progressive-web-apps-chromium/how-to/window-controls-overlay"
              jslogcontext="customize-pwa-tittle-bar">
            ${i18nString(UIStrings.customizePwaTitleBar)}
          </devtools-link>`})}
        </div>
    </div>`;
  // clang-format on
}

function getInstallabilityErrorMessages(installabilityErrors: Protocol.Page.InstallabilityError[]): string[] {
  const errorMessages = [];
  for (const installabilityError of installabilityErrors) {
    let errorMessage;
    switch (installabilityError.errorId) {
      case 'not-in-main-frame':
        errorMessage = i18nString(UIStrings.pageIsNotLoadedInTheMainFrame);
        break;
      case 'not-from-secure-origin':
        errorMessage = i18nString(UIStrings.pageIsNotServedFromASecureOrigin);
        break;
      case 'no-manifest':
        errorMessage = i18nString(UIStrings.pageHasNoManifestLinkUrl);
        break;
      case 'manifest-empty':
        errorMessage = i18nString(UIStrings.manifestCouldNotBeFetchedIsEmpty);
        break;
      case 'start-url-not-valid':
        errorMessage = i18nString(UIStrings.manifestStartUrlIsNotValid);
        break;
      case 'manifest-missing-name-or-short-name':
        errorMessage = i18nString(UIStrings.manifestDoesNotContainANameOr);
        break;
      case 'manifest-display-not-supported':
        errorMessage = i18nString(UIStrings.manifestDisplayPropertyMustBeOne);
        break;
      case 'manifest-missing-suitable-icon':
        if (installabilityError.errorArguments.length !== 1 ||
            installabilityError.errorArguments[0].name !== 'minimum-icon-size-in-pixels') {
          console.error('Installability error does not have the correct errorArguments');
          break;
        }
        errorMessage =
            i18nString(UIStrings.manifestDoesNotContainASuitable, {PH1: installabilityError.errorArguments[0].value});
        break;
      case 'no-acceptable-icon':
        if (installabilityError.errorArguments.length !== 1 ||
            installabilityError.errorArguments[0].name !== 'minimum-icon-size-in-pixels') {
          console.error('Installability error does not have the correct errorArguments');
          break;
        }
        errorMessage =
            i18nString(UIStrings.noSuppliedIconIsAtLeastSpxSquare, {PH1: installabilityError.errorArguments[0].value});
        break;
      case 'cannot-download-icon':
        errorMessage = i18nString(UIStrings.couldNotDownloadARequiredIcon);
        break;
      case 'no-icon-available':
        errorMessage = i18nString(UIStrings.downloadedIconWasEmptyOr);
        break;
      case 'platform-not-supported-on-android':
        errorMessage = i18nString(UIStrings.theSpecifiedApplicationPlatform);
        break;
      case 'no-id-specified':
        errorMessage = i18nString(UIStrings.noPlayStoreIdProvided);
        break;
      case 'ids-do-not-match':
        errorMessage = i18nString(UIStrings.thePlayStoreAppUrlAndPlayStoreId);
        break;
      case 'already-installed':
        errorMessage = i18nString(UIStrings.theAppIsAlreadyInstalled);
        break;
      case 'url-not-supported-for-webapk':
        errorMessage = i18nString(UIStrings.aUrlInTheManifestContainsA);
        break;
      case 'in-incognito':
        errorMessage = i18nString(UIStrings.pageIsLoadedInAnIncognitoWindow);
        break;
      case 'not-offline-capable':
        errorMessage = i18nString(UIStrings.pageDoesNotWorkOffline);
        break;
      case 'no-url-for-service-worker':
        errorMessage = i18nString(UIStrings.couldNotCheckServiceWorker);
        break;
      case 'prefer-related-applications':
        errorMessage = i18nString(UIStrings.manifestSpecifies);
        break;
      case 'prefer-related-applications-only-beta-stable':
        errorMessage = i18nString(UIStrings.preferrelatedapplicationsIsOnly);
        break;
      case 'manifest-display-override-not-supported':
        errorMessage = i18nString(UIStrings.manifestContainsDisplayoverride);
        break;
      case 'warn-not-offline-capable':
        errorMessage = i18nString(
            UIStrings.pageDoesNotWorkOfflineThePage,
            {PH1: 'https://developer.chrome.com/blog/improved-pwa-offline-detection/'});
        break;
      default:
        console.error(`Installability error id '${installabilityError.errorId}' is not recognized`);
        break;
    }
    if (errorMessage) {
      errorMessages.push(errorMessage);
    }
  }
  return errorMessages;
}

function renderWindowControls(
    selectedPlatform: string, onSelectOs: (selectedOS: SDK.OverlayModel.EmulatedOSType) => Promise<void>,
    onToggleWcoToolbar: (enabled: boolean) => Promise<void>): LitTemplate {
  // clang-format off
    return html`<div class="report-row">
      <devtools-checkbox @click=${(event: Event) => onToggleWcoToolbar((event.target as HTMLInputElement).checked)}
          title=${i18nString(UIStrings.selectWindowControlsOverlayEmulationOs)}>
        ${i18nString(UIStrings.selectWindowControlsOverlayEmulationOs)}
      </devtools-checkbox>
      <select value=${selectedPlatform}
              @change=${(event: Event): void => {
                const target = event.target as HTMLSelectElement;
                const selectedOS = target.options[target.selectedIndex].value;
                void onSelectOs(selectedOS as SDK.OverlayModel.EmulatedOSType);
              }}
             .selectedIndex=${0}>
        <option value=${SDK.OverlayModel.EmulatedOSType.WINDOWS}
                jslog=${VisualLogging.item('windows').track({click: true})}>
          Windows
        </option>
        <option value=${SDK.OverlayModel.EmulatedOSType.MAC}
                jslog=${VisualLogging.item('macos').track({click: true })}>
          macOS
        </option>
        <option value=${SDK.OverlayModel.EmulatedOSType.LINUX}
                jslog=${VisualLogging.item('linux').track({click: true})}>
          Linux
        </option>
      </select>
    </div>`;
  // clang-format on
}

interface ViewInput {
  isEmpty?: boolean;
  errorsSection?: UI.ReportView.Section;
  installabilitySection?: UI.ReportView.Section;
  identitySection?: UI.ReportView.Section;
  presentationSection?: UI.ReportView.Section;
  iconsSection?: UI.ReportView.Section;
  maskedIcons?: boolean;
  windowControlsSection?: UI.ReportView.Section;
  shortcutSections?: UI.ReportView.Section[];
  screenshotsSections?: UI.ReportView.Section[];
  parsedManifest?: Manifest;
  url?: Platform.DevToolsPath.UrlString;
  identityData?: IdentitySectionData;
  presentationData?: PresentationSectionData;
  protocolHandlersData?: ProtocolHandlersSectionData;
  iconsData?: IconsSectionData;
  shortcutsData?: ShortcutsSectionData;
  screenshotsData?: ScreenshotsSectionData;
  installabilityErrors?: Protocol.Page.InstallabilityError[];
  warnings?: Platform.UIString.LocalizedString[];
  errors?: Protocol.Page.AppManifestError[];
  imageErrors?: Platform.UIString.LocalizedString[];
  windowControlsData?: WindowControlsSectionData;
  selectedPlatform?: string;
  onSelectOs?: (selectedOS: SDK.OverlayModel.EmulatedOSType) => Promise<void>;
  onToggleWcoToolbar?: (enabled: boolean) => Promise<void>;
  onCopyId?: () => void;
  onToggleIconMasked?: (masked: boolean) => void;
}

interface ViewOutput {
  scrollToSection: Map<string, () => void>;
  focusOnSection: Map<string, () => void>;
}

type View = (input: ViewInput, output: ViewOutput, target: HTMLElement) => void;

export const DEFAULT_VIEW: View = (input, output, target) => {
  const {
    isEmpty,
    identityData,
    presentationData,
    protocolHandlersData,
    iconsData,
    shortcutsData,
    screenshotsData,
    installabilityErrors,
    warnings,
    errors,
    imageErrors,
    maskedIcons,
    windowControlsData,
    selectedPlatform,
    onSelectOs,
    onToggleWcoToolbar,
    onToggleIconMasked,
    onCopyId,
    url,
  } = input;
  // clang-format off
  render(html`
    <style>${appManifestViewStyles}</style>
    <style>${UI.inspectorCommonStyles}</style>
    ${isEmpty ? widget(UI.EmptyWidget.EmptyWidget, {
      header: i18nString(UIStrings.noManifestDetected),
      text: i18nString(UIStrings.manifestDescription),
      link: 'https://web.dev/add-manifest/' as Platform.DevToolsPath.UrlString
    }) : html`
    <devtools-report .data=${{reportTitle: i18nString(UIStrings.appManifest), reportUrl: url}}>
      ${renderErrors(warnings, errors, imageErrors, output)}
      ${installabilityErrors?.length ? renderInstallability(installabilityErrors) : nothing}
      ${identityData && onCopyId ? renderIdentity(identityData, onCopyId, output) : nothing}
      ${presentationData ? renderPresentation(presentationData, output) : nothing}
      ${protocolHandlersData ? renderProtocolHandlers(protocolHandlersData, output) : nothing}
      ${iconsData && onToggleIconMasked ?
          renderIcons(iconsData, Boolean(maskedIcons), onToggleIconMasked, output) : nothing}
      ${windowControlsData && output ? renderWindowControlsSection(
          windowControlsData, selectedPlatform, onSelectOs, onToggleWcoToolbar, output) : nothing}
      ${shortcutsData ? renderShortcuts(shortcutsData) : nothing}
      ${screenshotsData ? renderScreenshots(screenshotsData) : nothing}
    </devtools-report>`}`, target);
  // clang-format on
};

export class AppManifestView extends Common.ObjectWrapper.eventMixin<EventTypes, typeof UI.Widget.VBox>(UI.Widget.VBox)
    implements SDK.TargetManager.Observer {
  private registeredListeners: Common.EventTarget.EventDescriptor[];
  private target?: SDK.Target.Target;
  private resourceTreeModel?: SDK.ResourceTreeModel.ResourceTreeModel|null;
  private serviceWorkerManager?: SDK.ServiceWorkerManager.ServiceWorkerManager|null;
  private overlayModel?: SDK.OverlayModel.OverlayModel|null;
  private manifestUrl: Platform.DevToolsPath.UrlString;
  private manifestData: string|null;
  private manifestErrors: Protocol.Page.AppManifestError[];
  private installabilityErrors: Protocol.Page.InstallabilityError[];
  private appIdResponse: Protocol.Page.GetAppIdResponse|null;
  private wcoToolbarEnabled = false;
  private maskedIcons = false;
  private readonly view: View;
  private readonly output: ViewOutput = {scrollToSection: new Map(), focusOnSection: new Map()};

  constructor(view: View = DEFAULT_VIEW) {
    super({
      jslog: `${VisualLogging.pane('manifest')}`,
      useShadowDom: true,
    });
    this.view = view;

    SDK.TargetManager.TargetManager.instance().observeTargets(this);
    this.registeredListeners = [];

    this.manifestUrl = Platform.DevToolsPath.EmptyUrlString;
    this.manifestData = null;
    this.manifestErrors = [];
    this.installabilityErrors = [];
    this.appIdResponse = null;
  }

  scrollToSection(sectionTitle: string): void {
    const handler = this.output.scrollToSection.get(sectionTitle);
    if (!handler) {
      return;
    }
    handler();
    UI.ARIAUtils.LiveAnnouncer.alert(i18nString(UIStrings.onInvokeAlert, {PH1: sectionTitle}));
  }

  focusOnSection(sectionTitle: string): boolean {
    const handler = this.output.focusOnSection.get(sectionTitle);
    if (!handler) {
      return false;
    }
    handler();
    return true;
  }

  getStaticSections(): Array<{title: string, jslogContext: string|undefined}> {
    return [
      {title: i18nString(UIStrings.identity), jslogContext: 'identity'},
      {title: i18nString(UIStrings.presentation), jslogContext: 'presentation'},
      {title: i18nString(UIStrings.protocolHandlers), jslogContext: 'protocol-handlers'},
      {title: i18nString(UIStrings.icons), jslogContext: 'icons'},
      {title: i18nString(UIStrings.windowControlsOverlay), jslogContext: 'window-controls'},
    ];
  }

  getManifestElement(): Element {
    return this.contentElement;
  }

  targetAdded(target: SDK.Target.Target): void {
    if (target !== SDK.TargetManager.TargetManager.instance().primaryPageTarget()) {
      return;
    }
    this.target = target;
    this.resourceTreeModel = target.model(SDK.ResourceTreeModel.ResourceTreeModel);
    this.serviceWorkerManager = target.model(SDK.ServiceWorkerManager.ServiceWorkerManager);
    this.overlayModel = target.model(SDK.OverlayModel.OverlayModel);
    if (!this.resourceTreeModel || !this.serviceWorkerManager || !this.overlayModel) {
      return;
    }

    void this.updateManifest(true);

    this.registeredListeners = [
      this.resourceTreeModel.addEventListener(
          SDK.ResourceTreeModel.Events.DOMContentLoaded,
          () => {
            void this.updateManifest(true);
          }),
      this.serviceWorkerManager.addEventListener(
          SDK.ServiceWorkerManager.Events.REGISTRATION_UPDATED,
          () => {
            void this.updateManifest(false);
          }),
    ];
  }

  targetRemoved(target: SDK.Target.Target): void {
    if (this.target !== target) {
      return;
    }
    if (!this.resourceTreeModel || !this.serviceWorkerManager || !this.overlayModel) {
      return;
    }
    delete this.resourceTreeModel;
    delete this.serviceWorkerManager;
    delete this.overlayModel;
    Common.EventTarget.removeEventListeners(this.registeredListeners);
  }

  private async updateManifest(immediately: boolean): Promise<void> {
    if (!this.resourceTreeModel) {
      return;
    }
    const [{url, data, errors}, installabilityErrors, appId] = await Promise.all([
      this.resourceTreeModel.fetchAppManifest(),
      this.resourceTreeModel.getInstallabilityErrors(),
      this.resourceTreeModel.getAppId(),
    ]);

    this.manifestUrl = url;
    this.manifestData = data;
    this.manifestErrors = errors;
    this.installabilityErrors = installabilityErrors;
    this.appIdResponse = appId;

    if (immediately) {
      await this.performUpdate();
    } else {
      await this.requestUpdate();
    }
  }

  override async performUpdate(): Promise<void> {
    const url = this.manifestUrl;
    let data = this.manifestData;
    const errors = this.manifestErrors;
    const installabilityErrors = this.installabilityErrors;
    const appIdResponse = this.appIdResponse;

    const appId = appIdResponse?.appId || null;
    const recommendedId = appIdResponse?.recommendedId || null;
    if ((!data || data === '{}') && !errors.length) {
      this.view({isEmpty: true}, this.output, this.contentElement);
      this.dispatchEventToListeners(Events.MANIFEST_DETECTED, false);
      return;
    }
    this.dispatchEventToListeners(Events.MANIFEST_DETECTED, true);

    if (!data) {
      this.view({url, errors}, this.output, this.contentElement);
      return;
    }

    if (data.charCodeAt(0) === 0xFEFF) {
      data = data.slice(1);
    }  // Trim the BOM as per https://tools.ietf.org/html/rfc7159#section-8.1.

    const parsedManifest = JSON.parse(data);

    const identityData = this.processIdentity(parsedManifest, appId, recommendedId);

    const presentationData = this.processPresentation(parsedManifest, url);
    const protocolHandlersData = this.processProtocolHandlers(parsedManifest, url);

    const iconsData = await this.processIcons(parsedManifest, url);
    const shortcutsData = await this.processShortcuts(parsedManifest, url);

    const screenshotsData = await this.processScreenshots(parsedManifest, url);

    const warnings = [
      ...identityData.warnings,
      ...shortcutsData.warnings,
      ...screenshotsData.warnings,
    ];

    const imageErrors = [
      ...iconsData.imageResourceErrors,
      ...shortcutsData.imageResourceErrors,
      ...screenshotsData.imageResourceErrors,
    ];

    const windowControlsData = await this.processWindowControls(parsedManifest, url);
    const selectedPlatform = this.overlayModel?.getWindowControlsConfig().selectedPlatform;
    const onSelectOs = this.overlayModel ?
        (selectedOS: SDK.OverlayModel.EmulatedOSType) => this.onSelectOs(selectedOS, windowControlsData.themeColor) :
        undefined;
    const onToggleWcoToolbar = this.overlayModel ? (enabled: boolean) => this.onToggleWcoToolbar(enabled) : undefined;
    const onCopyId = recommendedId ? () : void => {
      UI.ARIAUtils.LiveAnnouncer.alert(i18nString(UIStrings.copiedToClipboard, {PH1: recommendedId}));
      Host.InspectorFrontendHost.InspectorFrontendHostInstance.copyText(recommendedId);
    }: undefined;
    const onToggleIconMasked = (masked: boolean): void => {
      this.maskedIcons = masked;
      this.requestUpdate();
    };
    this.view(
        {
          maskedIcons: this.maskedIcons,
          parsedManifest,
          url,
          identityData,
          presentationData,
          protocolHandlersData,
          iconsData,
          shortcutsData,
          screenshotsData,
          installabilityErrors,
          warnings,
          errors,
          imageErrors,
          windowControlsData,
          selectedPlatform,
          onSelectOs,
          onToggleWcoToolbar,
          onCopyId,
          onToggleIconMasked,
        },
        this.output, this.contentElement);
  }

  private stringProperty(parsedManifest: Manifest, name: keyof Manifest): string {
    const value = parsedManifest[name];
    if (typeof value !== 'string') {
      return '';
    }
    return value;
  }

  private async loadImage(url: Platform.DevToolsPath.UrlString): Promise<{
    naturalWidth: number,
    naturalHeight: number,
    src: string,
  }|null> {
    const frameId = this.resourceTreeModel?.mainFrame?.id;
    if (!this.target) {
      throw new Error('no target');
    }
    if (!frameId) {
      throw new Error('no main frame found');
    }
    let content;
    try {
      const response = await SDK.PageResourceLoader.PageResourceLoader.instance().loadResource(
          url, {
            target: this.target,
            frameId,
            initiatorUrl: this.target.inspectedURL(),
          },
          /* isBinary=*/ true);
      content = response.content;
    } catch {
      return null;
    }
    // Just loading the image, not building UI.
    /* eslint-disable @devtools/no-imperative-dom-api */
    const image = document.createElement('img');
    const result = new Promise((resolve, reject) => {
      image.onload = resolve;
      image.onerror = reject;
    });
    // Octet-stream seems to work for most cases. If it turns out it
    // does not work, we can parse mimeType out of the response headers
    // using front_end/core/platform/MimeType.ts.
    image.src = 'data:application/octet-stream;base64,' + await Common.Base64.encode(content);
    /* eslint-enable @devtools/no-imperative-dom-api */
    try {
      await result;
      return {naturalWidth: image.naturalWidth, naturalHeight: image.naturalHeight, src: image.src};
    } catch {
    }
    return null;
  }

  parseSizes(
      sizes: string, resourceName: Platform.UIString.LocalizedString, imageUrl: string,
      imageResourceErrors: Platform.UIString.LocalizedString[]): ParsedSize[] {
    const rawSizeArray = sizes ? sizes.split(/\s+/) : [];
    const parsedSizes: ParsedSize[] = [];
    for (const size of rawSizeArray) {
      if (size === 'any') {
        if (!parsedSizes.find(x => 'any' in x)) {
          parsedSizes.push({any: 'any', formatted: 'any'});
        }
        continue;
      }
      const match = size.match(/^(?<width>\d+)[xX](?<height>\d+)$/);
      if (match) {
        const width = parseInt(match.groups?.width || '', 10);
        const height = parseInt(match.groups?.height || '', 10);
        const formatted = `${width}×${height}px`;
        parsedSizes.push({width, height, formatted});
      } else {
        imageResourceErrors.push(i18nString(UIStrings.sSShouldSpecifyItsSizeAs, {PH1: resourceName, PH2: imageUrl}));
      }
    }
    return parsedSizes;
  }

  checkSizeProblem(
      size: ParsedSize, naturalWidth: number, naturalHeight: number, resourceName: Platform.UIString.LocalizedString,
      imageUrl: string): {hasSquareSize: boolean, error?: Platform.UIString.LocalizedString} {
    if ('any' in size) {
      return {hasSquareSize: naturalWidth === naturalHeight};
    }
    const hasSquareSize = size.width === size.height;
    if (naturalWidth !== size.width && naturalHeight !== size.height) {
      return {
        error: i18nString(UIStrings.actualSizeSspxOfSSDoesNotMatch, {
          PH1: naturalWidth,
          PH2: naturalHeight,
          PH3: resourceName,
          PH4: imageUrl,
          PH5: size.width,
          PH6: size.height,
        }),
        hasSquareSize,
      };
    }
    if (naturalWidth !== size.width) {
      return {
        error: i18nString(
            UIStrings.actualWidthSpxOfSSDoesNotMatch,
            {PH1: naturalWidth, PH2: resourceName, PH3: imageUrl, PH4: size.width}),
        hasSquareSize,
      };
    }
    if (naturalHeight !== size.height) {
      return {
        error: i18nString(
            UIStrings.actualHeightSpxOfSSDoesNotMatch,
            {PH1: naturalHeight, PH2: resourceName, PH3: imageUrl, PH4: size.height}),
        hasSquareSize,
      };
    }
    return {hasSquareSize};
  }

  private async processImageResource(
      baseUrl: Platform.DevToolsPath.UrlString,
      imageResource: any,  // eslint-disable-line @typescript-eslint/no-explicit-any
      isScreenshot: boolean): Promise<ProcessedImageResource> {
    const imageResourceErrors: Platform.UIString.LocalizedString[] = [];
    const resourceName = isScreenshot ? i18nString(UIStrings.screenshot) : i18nString(UIStrings.icon);
    if (!imageResource.src) {
      imageResourceErrors.push(i18nString(UIStrings.sSrcIsNotSet, {PH1: resourceName}));
      return {imageResourceErrors};
    }
    const imageUrl = Common.ParsedURL.ParsedURL.completeURL(baseUrl, imageResource['src']);
    if (!imageUrl) {
      imageResourceErrors.push(
          i18nString(UIStrings.sUrlSFailedToParse, {PH1: resourceName, PH2: imageResource['src']}));
      return {imageResourceErrors, imageUrl: imageResource['src']};
    }
    const result = await this.loadImage(imageUrl);
    if (!result) {
      imageResourceErrors.push(i18nString(UIStrings.sSFailedToLoad, {PH1: resourceName, PH2: imageUrl}));
      return {imageResourceErrors, imageUrl};
    }
    const {src, naturalWidth, naturalHeight} = result;
    const sizes = this.parseSizes(imageResource['sizes'], resourceName, imageUrl, imageResourceErrors);
    const title = sizes.map(x => x.formatted).join(' ') + '\n' + (imageResource['type'] || '');
    let squareSizedIconAvailable = false;
    if (!imageResource.sizes) {
      imageResourceErrors.push(i18nString(UIStrings.sSDoesNotSpecifyItsSizeInThe, {PH1: resourceName, PH2: imageUrl}));
    } else {
      if (isScreenshot && sizes.length > 0 && 'any' in sizes[0]) {
        imageResourceErrors.push(i18nString(UIStrings.screenshotPixelSize, {url: imageUrl}));
      }
      for (const size of sizes) {
        const {error, hasSquareSize} = this.checkSizeProblem(size, naturalWidth, naturalHeight, resourceName, imageUrl);
        squareSizedIconAvailable = squareSizedIconAvailable || hasSquareSize;
        if (error) {
          imageResourceErrors.push(error);
        } else if (isScreenshot) {
          const width = 'any' in size ? naturalWidth : size.width;
          const height = 'any' in size ? naturalHeight : size.height;
          if (width < 320 || height < 320) {
            imageResourceErrors.push(
                i18nString(UIStrings.sSSizeShouldBeAtLeast320, {PH1: resourceName, PH2: imageUrl}));
          } else if (width > 3840 || height > 3840) {
            imageResourceErrors.push(
                i18nString(UIStrings.sSSizeShouldBeAtMost3840, {PH1: resourceName, PH2: imageUrl}));
          } else if (width > (height * 2.3)) {
            imageResourceErrors.push(
                i18nString(UIStrings.sSWidthDoesNotComplyWithRatioRequirement, {PH1: resourceName, PH2: imageUrl}));
          } else if (height > (width * 2.3)) {
            imageResourceErrors.push(
                i18nString(UIStrings.sSHeightDoesNotComplyWithRatioRequirement, {PH1: resourceName, PH2: imageUrl}));
          }
        }
      }
    }

    const purpose = typeof imageResource['purpose'] === 'string' ? imageResource['purpose'].toLowerCase() : '';
    if (purpose.includes('any') && purpose.includes('maskable')) {
      imageResourceErrors.push(i18nString(UIStrings.avoidPurposeAnyAndMaskable));
    }

    return {
      imageResourceErrors,
      squareSizedIconAvailable,
      naturalWidth,
      naturalHeight,
      title,
      imageSrc: src,
      imageUrl,
    };
  }

  private async onToggleWcoToolbar(enabled: boolean): Promise<void> {
    this.wcoToolbarEnabled = enabled;
    if (this.overlayModel) {
      await this.overlayModel.toggleWindowControlsToolbar(this.wcoToolbarEnabled);
    }
  }

  private async onSelectOs(selectedOS: SDK.OverlayModel.EmulatedOSType, themeColor: string): Promise<void> {
    if (this.overlayModel) {
      this.overlayModel.setWindowControlsPlatform(selectedOS);
      this.overlayModel.setWindowControlsThemeColor(themeColor);
      await this.overlayModel.toggleWindowControlsToolbar(this.wcoToolbarEnabled);
    }
  }

  private processIdentity(parsedManifest: Manifest, appId: string|null, recommendedId: string|null):
      IdentitySectionData {
    const description = this.stringProperty(parsedManifest, 'description');
    const warnings: Platform.UIString.LocalizedString[] = [];
    // See https://crbug.com/1354304 for details.
    if (description.length > 300) {
      warnings.push(i18nString(UIStrings.descriptionMayBeTruncated));
    }
    return {
      name: this.stringProperty(parsedManifest, 'name'),
      shortName: this.stringProperty(parsedManifest, 'short_name'),
      description: this.stringProperty(parsedManifest, 'description'),
      appId,
      recommendedId,
      hasId: Boolean(this.stringProperty(parsedManifest, 'id')),
      warnings,
    };
  }

  private async processIcons(parsedManifest: Manifest, url: Platform.DevToolsPath.UrlString):
      Promise<IconsSectionData> {
    const icons = parsedManifest['icons'] || [];
    const imageErrors: Platform.UIString.LocalizedString[] = [];
    const processedIcons: ProcessedImageResource[] = [];
    let squareSizedIconAvailable = false;

    for (const icon of icons) {
      const result = await this.processImageResource(url, icon, /** isScreenshot= */ false);
      processedIcons.push(result);
      imageErrors.push(...result.imageResourceErrors);

      if (result.squareSizedIconAvailable) {
        squareSizedIconAvailable = true;
      }
    }

    const processedIconsByTitle = Map.groupBy(
        processedIcons.filter((icon): icon is ProcessedImageResource&{title: string} => 'title' in icon),
        img => img.title,
    );

    if (!squareSizedIconAvailable) {
      imageErrors.push(i18nString(UIStrings.sSShouldHaveSquareIcon));
    }
    return {icons: processedIconsByTitle, imageResourceErrors: imageErrors};
  }

  private async processShortcuts(parsedManifest: Manifest, url: Platform.DevToolsPath.UrlString):
      Promise<ShortcutsSectionData> {
    const shortcuts = parsedManifest['shortcuts'] || [];
    const processedShortcuts: ProcessedShortcut[] = [];

    const warnings: Platform.UIString.LocalizedString[] = [];
    const imageErrors: Platform.UIString.LocalizedString[] = [];

    if (shortcuts.length > 4) {
      warnings.push(i18nString(UIStrings.shortcutsMayBeNotAvailable));
    }

    let shortcutIndex = 1;
    for (const shortcut of shortcuts) {
      const shortcutUrl = Common.ParsedURL.ParsedURL.completeURL(url, shortcut.url) as Platform.DevToolsPath.UrlString;
      const shortcutIcons = shortcut.icons || [];
      const processedIcons: ProcessedImageResource[] = [];
      let hasShortcutIconLargeEnough = false;

      for (const shortcutIcon of shortcutIcons) {
        const result = await this.processImageResource(url, shortcutIcon, /** isScreenshot= */ false);
        processedIcons.push(result);
        imageErrors.push(...result.imageResourceErrors);

        if (!hasShortcutIconLargeEnough && shortcutIcon.sizes) {
          const shortcutIconSize = shortcutIcon.sizes.match(/^(\d+)x(\d+)$/);
          if (shortcutIconSize && Number(shortcutIconSize[1]) >= 96 && Number(shortcutIconSize[2]) >= 96) {
            hasShortcutIconLargeEnough = true;
          }
        }
      }

      const iconsByTitle = Map.groupBy(
          processedIcons.filter(icon => 'title' in icon),
          img => img.title,
      );

      processedShortcuts.push({
        name: shortcut.name,
        shortName: shortcut.short_name,
        description: shortcut.description,
        url: shortcut.url,
        shortcutUrl,
        icons: iconsByTitle,
      });

      if (!hasShortcutIconLargeEnough) {
        imageErrors.push(i18nString(UIStrings.shortcutSShouldIncludeAXPixel, {PH1: shortcutIndex}));
      }
      shortcutIndex++;
    }
    return {shortcuts: processedShortcuts, warnings, imageResourceErrors: imageErrors};
  }

  private async processScreenshots(parsedManifest: Manifest, url: Platform.DevToolsPath.UrlString):
      Promise<ScreenshotsSectionData> {
    const screenshots: Screenshot[] = parsedManifest['screenshots'] || [];
    const processedScreenshots: ProcessedScreenshot[] = [];

    const warnings: Platform.UIString.LocalizedString[] = [];
    const imageErrors: Platform.UIString.LocalizedString[] = [];

    let haveScreenshotsDifferentAspectRatio = false;
    const formFactorScreenshotDimensions = new Map<string, {width: number, height: number}>();
    for (const screenshot of screenshots) {
      const result = await this.processImageResource(url, screenshot, /** isScreenshot= */ true);
      processedScreenshots.push({screenshot, processedImage: result});
      imageErrors.push(...result.imageResourceErrors);

      if (screenshot.form_factor && 'naturalWidth' in result) {
        const width = result.naturalWidth;
        const height = result.naturalHeight;
        formFactorScreenshotDimensions.has(screenshot.form_factor) ||
            formFactorScreenshotDimensions.set(screenshot.form_factor, {width, height});
        const formFactorFirstScreenshotDimensions = formFactorScreenshotDimensions.get(screenshot.form_factor);
        if (formFactorFirstScreenshotDimensions) {
          haveScreenshotsDifferentAspectRatio = haveScreenshotsDifferentAspectRatio ||
              (width * formFactorFirstScreenshotDimensions.height !==
               height * formFactorFirstScreenshotDimensions.width);
        }
      }
    }

    if (haveScreenshotsDifferentAspectRatio) {
      warnings.push(i18nString(UIStrings.screenshotsMustHaveSameAspectRatio));
    }

    const screenshotsForDesktop = screenshots.filter(screenshot => screenshot.form_factor === 'wide');
    const screenshotsForMobile = screenshots.filter(screenshot => screenshot.form_factor !== 'wide');

    if (screenshotsForDesktop.length < 1) {
      warnings.push(i18nString(UIStrings.noScreenshotsForRicherPWAInstallOnDesktop));
    }
    if (screenshotsForMobile.length < 1) {
      warnings.push(i18nString(UIStrings.noScreenshotsForRicherPWAInstallOnMobile));
    }
    if (screenshotsForDesktop.length > 8) {
      warnings.push(i18nString(UIStrings.tooManyScreenshotsForDesktop));
    }
    if (screenshotsForMobile.length > 5) {
      warnings.push(i18nString(UIStrings.tooManyScreenshotsForMobile));
    }

    return {screenshots: processedScreenshots, warnings, imageResourceErrors: imageErrors};
  }

  private async processWindowControls(parsedManifest: Manifest, url: Platform.DevToolsPath.UrlString):
      Promise<WindowControlsSectionData> {
    const displayOverride = parsedManifest['display_override'] || [];
    const hasWco = displayOverride.includes('window-controls-overlay');
    const themeColor = this.stringProperty(parsedManifest, 'theme_color');
    let wcoStyleSheetText = false;
    if (this.overlayModel) {
      wcoStyleSheetText = await this.overlayModel.hasStyleSheetText(url);
    }
    return {
      hasWco,
      themeColor,
      wcoStyleSheetText,
      url,
    };
  }

  private processPresentation(parsedManifest: Manifest, url: Platform.DevToolsPath.UrlString): PresentationSectionData {
    const startURL = this.stringProperty(parsedManifest, 'start_url');
    const completeURL = startURL ? Common.ParsedURL.ParsedURL.completeURL(url, startURL) : null;
    const themeColorString = this.stringProperty(parsedManifest, 'theme_color');
    const themeColor = themeColorString ? Common.Color.parse(themeColorString) ?? Common.Color.parse('white') : null;
    const backgroundColorString = this.stringProperty(parsedManifest, 'background_color');
    const backgroundColor =
        backgroundColorString ? Common.Color.parse(backgroundColorString) ?? Common.Color.parse('white') : null;
    const noteTaking = parsedManifest['note_taking'] || {};
    const newNoteUrl = noteTaking['new_note_url'];
    const hasNewNoteUrl = typeof newNoteUrl === 'string';
    const completeNewNoteUrl = hasNewNoteUrl ?
        (Common.ParsedURL.ParsedURL.completeURL(url, newNoteUrl) as Platform.DevToolsPath.UrlString) :
        null;

    return {
      startUrl: startURL,
      completeStartUrl: completeURL,
      themeColor,
      backgroundColor,
      orientation: this.stringProperty(parsedManifest, 'orientation'),
      display: this.stringProperty(parsedManifest, 'display'),
      newNoteUrl,
      hasNewNoteUrl,
      completeNewNoteUrl,
    };
  }

  private processProtocolHandlers(parsedManifest: Manifest, url: Platform.DevToolsPath.UrlString):
      ProtocolHandlersSectionData {
    return {
      protocolHandlers: parsedManifest['protocol_handlers'] || [],
      manifestLink: url,
    };
  }
}

export const enum Events {
  MANIFEST_DETECTED = 'ManifestDetected',
}

export interface EventTypes {
  [Events.MANIFEST_DETECTED]: boolean;
}