// 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.

/* eslint-disable rulesdir/no_underscored_properties */
import * as Common from '../common/common.js';
import * as DataGrid from '../data_grid/data_grid.js';
import * as Host from '../host/host.js';
import * as i18n from '../i18n/i18n.js';
import * as SDK from '../sdk/sdk.js';
import * as UI from '../ui/ui.js';

export const UIStrings = {
  /**
  *@description Label for button that allows user to download the private key related to a credential.
  */
  export: 'Export',
  /**
  *@description Label for an item to remove something
  */
  remove: 'Remove',
  /**
  *@description Label for empty credentials table.
  *@example {navigator.credentials.create()} PH1
  */
  noCredentialsTryCallingSFromYour: 'No credentials. Try calling {PH1} from your website.',
  /**
  *@description Label for checkbox to toggle the virtual authenticator environment allowing user to interact with software-based virtual authenticators.
  */
  enableVirtualAuthenticator: 'Enable virtual authenticator environment',
  /**
  *@description Label for ID field for credentials.
  */
  id: 'ID',
  /**
  *@description Label for field that describes whether a credential is a resident credential.
  */
  isResident: 'Is Resident',
  /**
  *@description Label for credential field that represents the Relying Party ID that the credential is scoped to.
  */
  rpId: 'RP ID',
  /**
  *@description Label for credential field that represents the user a credential is mapped to
  */
  userHandle: 'User Handle',
  /**
  *@description Label for signature counter field for credentials which represents the number of successful assertions.
  */
  signCount: 'Sign Count',
  /**
  *@description Label for column with actions for credentials.
  */
  actions: 'Actions',
  /**
  *@description Title for the table that holds the credentials that a authenticator has registered.
  */
  credentials: 'Credentials',
  /**
  *@description Label for the learn more link that is shown before the virtual environment is enabled.
  */
  useWebauthnForPhishingresistant: 'Use WebAuthn for phishing-resistant authentication',
  /**
  *@description Text that is usually a hyperlink to more documentation
  */
  learnMore: 'Learn more',
  /**
  *@description Title for section of interface that allows user to add a new virtual authenticator.
  */
  newAuthenticator: 'New authenticator',
  /**
  *@description Text for security or network protocol
  */
  protocol: 'Protocol',
  /**
  *@description Label for input to select which transport option to use on virtual authenticators, e.g. USB or Bluetooth.
  */
  transport: 'Transport',
  /**
  *@description Label for checkbox that toggles resident key support on virtual authenticators.
  */
  supportsResidentKeys: 'Supports resident keys',
  /**
  *@description Text to add something
  */
  add: 'Add',
  /**
  *@description Label for button to add a new virtual authenticator.
  */
  addAuthenticator: 'Add authenticator',
  /**
  *@description Label for radio button that toggles whether an authenticator is active.
  */
  active: 'Active',
  /**
  *@description Title for button that enables user to customize name of authenticator.
  */
  editName: 'Edit name',
  /**
  *@description Title for button that enables user to save name of authenticator after editing it.
  */
  saveName: 'Save name',
  /**
  *@description Title for a user-added virtual authenticator which is uniquely identified with its AUTHENTICATORID.
  *@example {8c7873be-0b13-4996-a794-1521331bbd96} PH1
  */
  authenticatorS: 'Authenticator {PH1}',
  /**
  *@description Name for generated file which user can download. A private key is a secret code which enables encoding and decoding of a credential. .pem is the file extension.
  */
  privateKeypem: 'Private key.pem',
  /**
  *@description Label for field that holds an authenticator's universally unique identifier (UUID).
  */
  uuid: 'UUID',
  /**
  *@description Label for checkbox that toggles user verification support on virtual authenticators.
  */
  supportsUserVerification: 'Supports user verification',
  /**
  *@description Text in Timeline indicating that input has happened recently
  */
  yes: 'Yes',
  /**
  *@description Text in Timeline indicating that input has not happened recently
  */
  no: 'No',
  /**
  *@description Title of radio button that sets an authenticator as active.
  *@example {Authenticator ABCDEF} PH1
  */
  setSAsTheActiveAuthenticator: 'Set {PH1} as the active authenticator',
};
const str_ = i18n.i18n.registerUIStrings('webauthn/WebauthnPane.ts', UIStrings);
const i18nString = i18n.i18n.getLocalizedString.bind(undefined, str_);
const TIMEOUT = 1000;

const enum Events {
  ExportCredential = 'ExportCredential',
  RemoveCredential = 'RemoveCredential',
}


class DataGridNode extends DataGrid.DataGrid.DataGridNode<DataGridNode> {
  constructor(credential: Protocol.WebAuthn.Credential) {
    super(credential);
  }

  nodeSelfHeight(): number {
    return 24;
  }

  createCell(columnId: string): HTMLElement {
    const cell = super.createCell(columnId);
    UI.Tooltip.Tooltip.install(cell, cell.textContent || '');

    if (columnId !== 'actions') {
      return cell;
    }

    const exportButton = UI.UIUtils.createTextButton(i18nString(UIStrings.export), (): void => {
      if (this.dataGrid) {
        this.dataGrid.dispatchEventToListeners(Events.ExportCredential, this.data);
      }
    });

    cell.appendChild(exportButton);

    const removeButton = UI.UIUtils.createTextButton(i18nString(UIStrings.remove), (): void => {
      if (this.dataGrid) {
        this.dataGrid.dispatchEventToListeners(Events.RemoveCredential, this.data);
      }
    });

    cell.appendChild(removeButton);

    return cell;
  }
}

class EmptyDataGridNode extends DataGrid.DataGrid.DataGridNode<DataGridNode> {
  createCells(element: Element): void {
    element.removeChildren();
    const td = (this.createTDWithClass(DataGrid.DataGrid.Align.Center) as HTMLTableCellElement);
    if (this.dataGrid) {
      td.colSpan = this.dataGrid.visibleColumnsArray.length;
    }

    const code = document.createElement('span', {is: 'source-code'});
    code.textContent = 'navigator.credentials.create()';
    code.classList.add('code');
    const message = i18n.i18n.getFormatLocalizedString(str_, UIStrings.noCredentialsTryCallingSFromYour, {PH1: code});

    td.appendChild(message);
    element.appendChild(td);
  }
}

type AvailableAuthenticatorOptions = Protocol.WebAuthn.VirtualAuthenticatorOptions&{
  active: boolean,
  authenticatorId: Protocol.WebAuthn.AuthenticatorId,
};

let webauthnPaneImplInstance: WebauthnPaneImpl;

export class WebauthnPaneImpl extends UI.Widget.VBox {
  _enabled: boolean;
  _activeAuthId: string|null;
  _hasBeenEnabled: boolean;
  _dataGrids: Map<string, DataGrid.DataGrid.DataGridImpl<DataGridNode>>;
  // @ts-ignore
  _enableCheckbox: UI.Toolbar.ToolbarCheckbox;
  _availableAuthenticatorSetting: Common.Settings.Setting<AvailableAuthenticatorOptions[]>;
  _model: SDK.WebAuthnModel.WebAuthnModel|null|undefined;
  _authenticatorsView: HTMLElement;
  _topToolbarContainer: HTMLElement|undefined;
  _topToolbar: UI.Toolbar.Toolbar|undefined;
  _learnMoreView: HTMLElement|undefined;
  _newAuthenticatorSection: HTMLElement|undefined;
  _newAuthenticatorForm: HTMLElement|undefined;
  _protocolSelect: HTMLSelectElement|undefined;
  _transportSelect: HTMLSelectElement|undefined;
  _residentKeyCheckboxLabel: UI.UIUtils.CheckboxLabel|undefined;
  _residentKeyCheckbox: HTMLInputElement|undefined;
  _userVerificationCheckboxLabel: UI.UIUtils.CheckboxLabel|undefined;
  _userVerificationCheckbox: HTMLInputElement|undefined;
  _addAuthenticatorButton: HTMLButtonElement|undefined;
  _isEnabling?: Promise<void>;

  constructor() {
    super(true);
    this.registerRequiredCSS('webauthn/webauthnPane.css', {enableLegacyPatching: true});
    this.contentElement.classList.add('webauthn-pane');
    this._enabled = false;
    this._activeAuthId = null;
    this._hasBeenEnabled = false;
    this._dataGrids = new Map();

    this._availableAuthenticatorSetting =
        (Common.Settings.Settings.instance().createSetting('webauthnAuthenticators', []) as
         Common.Settings.Setting<AvailableAuthenticatorOptions[]>);

    const mainTarget = SDK.SDKModel.TargetManager.instance().mainTarget();
    if (mainTarget) {
      this._model = mainTarget.model(SDK.WebAuthnModel.WebAuthnModel);
    }

    this._createToolbar();
    this._authenticatorsView = this.contentElement.createChild('div', 'authenticators-view');
    this._createNewAuthenticatorSection();
    this._updateVisibility(false);
  }

  static instance(opts = {forceNew: null}): WebauthnPaneImpl {
    const {forceNew} = opts;
    if (!webauthnPaneImplInstance || forceNew) {
      webauthnPaneImplInstance = new WebauthnPaneImpl();
    }

    return webauthnPaneImplInstance;
  }

  async _loadInitialAuthenticators(): Promise<void> {
    let activeAuthenticatorId: string|null = null;
    const availableAuthenticators = this._availableAuthenticatorSetting.get();
    for (const options of availableAuthenticators) {
      if (!this._model) {
        continue;
      }

      const authenticatorId = await this._model.addAuthenticator(options);
      this._addAuthenticatorSection(authenticatorId, options);
      // Update the authenticatorIds in the options.
      options.authenticatorId = authenticatorId;
      if (options.active) {
        activeAuthenticatorId = authenticatorId;
      }
    }

    // Update the settings to reflect the new authenticatorIds.
    this._availableAuthenticatorSetting.set(availableAuthenticators);
    if (activeAuthenticatorId) {
      this._setActiveAuthenticator(activeAuthenticatorId);
    }
  }

  async ownerViewDisposed(): Promise<void> {
    if (this._enableCheckbox) {
      this._enableCheckbox.setChecked(false);
    }
    await this._setVirtualAuthEnvEnabled(false);
  }

  _createToolbar(): void {
    this._topToolbarContainer = this.contentElement.createChild('div', 'webauthn-toolbar-container');
    this._topToolbar = new UI.Toolbar.Toolbar('webauthn-toolbar', this._topToolbarContainer);
    const enableCheckboxTitle = i18nString(UIStrings.enableVirtualAuthenticator);
    this._enableCheckbox =
        new UI.Toolbar.ToolbarCheckbox(enableCheckboxTitle, enableCheckboxTitle, this._handleCheckboxToggle.bind(this));
    this._topToolbar.appendToolbarItem(this._enableCheckbox);
  }

  _createCredentialsDataGrid(authenticatorId: string): DataGrid.DataGrid.DataGridImpl<DataGridNode> {
    const columns = ([
      {
        id: 'credentialId',
        title: i18nString(UIStrings.id),
        longText: true,
        weight: 24,
      },
      {
        id: 'isResidentCredential',
        title: i18nString(UIStrings.isResident),
        dataType: DataGrid.DataGrid.DataType.Boolean,
        weight: 10,
      },
      {
        id: 'rpId',
        title: i18nString(UIStrings.rpId),
      },
      {
        id: 'userHandle',
        title: i18nString(UIStrings.userHandle),
      },
      {
        id: 'signCount',
        title: i18nString(UIStrings.signCount),
      },
      {id: 'actions', title: i18nString(UIStrings.actions)},
    ] as DataGrid.DataGrid.ColumnDescriptor[]);

    const dataGridConfig = {
      displayName: i18nString(UIStrings.credentials),
      columns,
      editCallback: undefined,
      deleteCallback: undefined,
      refreshCallback: undefined,
    };
    const dataGrid = new DataGrid.DataGrid.DataGridImpl(dataGridConfig);
    dataGrid.renderInline();
    dataGrid.setStriped(true);
    dataGrid.addEventListener(Events.ExportCredential, this._handleExportCredential, this);
    dataGrid.addEventListener(Events.RemoveCredential, this._handleRemoveCredential.bind(this, authenticatorId));

    this._dataGrids.set(authenticatorId, dataGrid);

    return dataGrid;
  }

  _handleExportCredential(e: {data: Protocol.WebAuthn.Credential}): void {
    this._exportCredential(e.data);
  }

  _handleRemoveCredential(authenticatorId: string, e: {data: Protocol.WebAuthn.Credential}): void {
    this._removeCredential(authenticatorId, e.data.credentialId);
  }

  async _updateCredentials(authenticatorId: string): Promise<void> {
    const dataGrid = this._dataGrids.get(authenticatorId);
    if (!dataGrid) {
      return;
    }

    if (this._model) {
      const credentials = await this._model.getCredentials(authenticatorId);

      dataGrid.rootNode().removeChildren();
      for (const credential of credentials) {
        const node = new DataGridNode(credential);
        dataGrid.rootNode().appendChild(node);
      }

      this._maybeAddEmptyNode(dataGrid);
    }

    // TODO(crbug.com/1112528): Add back-end events for credential creation and removal to avoid polling.
    setTimeout(this._updateCredentials.bind(this, authenticatorId), TIMEOUT);
  }

  _maybeAddEmptyNode(dataGrid: DataGrid.DataGrid.DataGridImpl<DataGridNode>): void {
    if (dataGrid.rootNode().children.length) {
      return;
    }

    const node = new EmptyDataGridNode();
    dataGrid.rootNode().appendChild(node);
  }

  async _setVirtualAuthEnvEnabled(enable: boolean): Promise<void> {
    await this._isEnabling;
    this._isEnabling = new Promise<void>(async (resolve: (value: void) => void) => {
      if (enable && !this._hasBeenEnabled) {
        // Ensures metric is only tracked once per session.
        Host.userMetrics.actionTaken(Host.UserMetrics.Action.VirtualAuthenticatorEnvironmentEnabled);
        this._hasBeenEnabled = true;
      }
      this._enabled = enable;
      if (this._model) {
        await this._model.setVirtualAuthEnvEnabled(enable);
      }

      if (enable) {
        await this._loadInitialAuthenticators();
      } else {
        this._removeAuthenticatorSections();
      }

      this._updateVisibility(enable);
      this._isEnabling = undefined;
      resolve();
    });
  }

  _updateVisibility(enabled: boolean): void {
    this.contentElement.classList.toggle('enabled', enabled);
  }

  _removeAuthenticatorSections(): void {
    this._authenticatorsView.innerHTML = '';
    this._dataGrids.clear();
  }

  _handleCheckboxToggle(e: MouseEvent): void {
    this._setVirtualAuthEnvEnabled((e.target as HTMLInputElement).checked);
  }

  _updateEnabledTransportOptions(enabledOptions: Protocol.WebAuthn.AuthenticatorTransport[]): void {
    if (!this._transportSelect) {
      return;
    }

    const prevValue = this._transportSelect.value;
    this._transportSelect.removeChildren();

    for (const option of enabledOptions) {
      this._transportSelect.appendChild(new Option(option, option));
    }

    // Make sure the currently selected value stays the same.
    this._transportSelect.value = prevValue;
    // If the new set does not include the previous value.
    if (!this._transportSelect.value) {
      // Select the first available value.
      this._transportSelect.selectedIndex = 0;
    }
  }

  _updateNewAuthenticatorSectionOptions(): void {
    if (!this._protocolSelect || !this._residentKeyCheckbox || !this._userVerificationCheckbox) {
      return;
    }

    if (this._protocolSelect.value === Protocol.WebAuthn.AuthenticatorProtocol.Ctap2) {
      this._residentKeyCheckbox.disabled = false;
      this._userVerificationCheckbox.disabled = false;
      this._updateEnabledTransportOptions([
        Protocol.WebAuthn.AuthenticatorTransport.Usb,
        Protocol.WebAuthn.AuthenticatorTransport.Ble,
        Protocol.WebAuthn.AuthenticatorTransport.Nfc,
        // TODO (crbug.com/1034663): Toggle cable as option depending on if cablev2 flag is on.
        // Protocol.WebAuthn.AuthenticatorTransport.Cable,
        Protocol.WebAuthn.AuthenticatorTransport.Internal,
      ]);
    } else {
      this._residentKeyCheckbox.checked = false;
      this._residentKeyCheckbox.disabled = true;
      this._userVerificationCheckbox.checked = false;
      this._userVerificationCheckbox.disabled = true;
      this._updateEnabledTransportOptions([
        Protocol.WebAuthn.AuthenticatorTransport.Usb,
        Protocol.WebAuthn.AuthenticatorTransport.Ble,
        Protocol.WebAuthn.AuthenticatorTransport.Nfc,
      ]);
    }
  }

  _createNewAuthenticatorSection(): void {
    this._learnMoreView = this.contentElement.createChild('div', 'learn-more');
    this._learnMoreView.appendChild(UI.Fragment.html`
  <div>
  ${i18nString(UIStrings.useWebauthnForPhishingresistant)}<br /><br />
  ${
        UI.XLink.XLink.create(
            'https://developers.google.com/web/updates/2018/05/webauthn', i18nString(UIStrings.learnMore))}
  </div>
  `);

    this._newAuthenticatorSection = this.contentElement.createChild('div', 'new-authenticator-container');
    const newAuthenticatorTitle =
        UI.UIUtils.createLabel(i18nString(UIStrings.newAuthenticator), 'new-authenticator-title');
    this._newAuthenticatorSection.appendChild(newAuthenticatorTitle);
    this._newAuthenticatorForm = this._newAuthenticatorSection.createChild('div', 'new-authenticator-form');

    const protocolGroup = this._newAuthenticatorForm.createChild('div', 'authenticator-option');
    const transportGroup = this._newAuthenticatorForm.createChild('div', 'authenticator-option');
    const residentKeyGroup = this._newAuthenticatorForm.createChild('div', 'authenticator-option');
    const userVerificationGroup = this._newAuthenticatorForm.createChild('div', 'authenticator-option');
    const addButtonGroup = this._newAuthenticatorForm.createChild('div', 'authenticator-option');

    const protocolSelectTitle = UI.UIUtils.createLabel(i18nString(UIStrings.protocol), 'authenticator-option-label');
    protocolGroup.appendChild(protocolSelectTitle);
    this._protocolSelect = (protocolGroup.createChild('select', 'chrome-select') as HTMLSelectElement);
    UI.ARIAUtils.bindLabelToControl(protocolSelectTitle, (this._protocolSelect as Element));
    Object.values(Protocol.WebAuthn.AuthenticatorProtocol)
        .sort()
        .forEach((option: Protocol.WebAuthn.AuthenticatorProtocol): void => {
          if (this._protocolSelect) {
            this._protocolSelect.appendChild(new Option(option, option));
          }
        });

    if (this._protocolSelect) {
      this._protocolSelect.value = Protocol.WebAuthn.AuthenticatorProtocol.Ctap2;
    }

    const transportSelectTitle = UI.UIUtils.createLabel(i18nString(UIStrings.transport), 'authenticator-option-label');
    transportGroup.appendChild(transportSelectTitle);
    this._transportSelect = (transportGroup.createChild('select', 'chrome-select') as HTMLSelectElement);
    UI.ARIAUtils.bindLabelToControl(transportSelectTitle, (this._transportSelect as Element));
    // transportSelect will be populated in _updateNewAuthenticatorSectionOptions.

    this._residentKeyCheckboxLabel = UI.UIUtils.CheckboxLabel.create(i18nString(UIStrings.supportsResidentKeys), false);
    this._residentKeyCheckboxLabel.textElement.classList.add('authenticator-option-label');
    residentKeyGroup.appendChild(this._residentKeyCheckboxLabel.textElement);
    this._residentKeyCheckbox = this._residentKeyCheckboxLabel.checkboxElement;
    this._residentKeyCheckbox.checked = false;
    this._residentKeyCheckbox.classList.add('authenticator-option-checkbox');
    residentKeyGroup.appendChild(this._residentKeyCheckboxLabel);

    this._userVerificationCheckboxLabel = UI.UIUtils.CheckboxLabel.create('Supports user verification', false);
    this._userVerificationCheckboxLabel.textElement.classList.add('authenticator-option-label');
    userVerificationGroup.appendChild(this._userVerificationCheckboxLabel.textElement);
    this._userVerificationCheckbox = this._userVerificationCheckboxLabel.checkboxElement;
    this._userVerificationCheckbox.checked = false;
    this._userVerificationCheckbox.classList.add('authenticator-option-checkbox');
    userVerificationGroup.appendChild(this._userVerificationCheckboxLabel);

    this._addAuthenticatorButton =
        UI.UIUtils.createTextButton(i18nString(UIStrings.add), this._handleAddAuthenticatorButton.bind(this), '');
    addButtonGroup.createChild('div', 'authenticator-option-label');
    addButtonGroup.appendChild(this._addAuthenticatorButton);
    const addAuthenticatorTitle = UI.UIUtils.createLabel(i18nString(UIStrings.addAuthenticator), '');
    UI.ARIAUtils.bindLabelToControl(addAuthenticatorTitle, this._addAuthenticatorButton);

    this._updateNewAuthenticatorSectionOptions();
    if (this._protocolSelect) {
      this._protocolSelect.addEventListener('change', this._updateNewAuthenticatorSectionOptions.bind(this));
    }
  }

  async _handleAddAuthenticatorButton(): Promise<void> {
    const options = this._createOptionsFromCurrentInputs();
    if (this._model) {
      const authenticatorId = await this._model.addAuthenticator(options);
      const availableAuthenticators = this._availableAuthenticatorSetting.get();
      availableAuthenticators.push({authenticatorId, active: true, ...options});
      this._availableAuthenticatorSetting.set(
          availableAuthenticators.map(a => ({...a, active: a.authenticatorId === authenticatorId})));
      const section = await this._addAuthenticatorSection(authenticatorId, options);
      const mediaQueryList = window.matchMedia('(prefers-reduced-motion: reduce)');
      const prefersReducedMotion = mediaQueryList.matches;
      section.scrollIntoView({block: 'start', behavior: prefersReducedMotion ? 'auto' : 'smooth'});
    }
  }

  async _addAuthenticatorSection(authenticatorId: string, options: Protocol.WebAuthn.VirtualAuthenticatorOptions):
      Promise<HTMLDivElement> {
    const section = document.createElement('div');
    section.classList.add('authenticator-section');
    section.setAttribute('data-authenticator-id', authenticatorId);
    this._authenticatorsView.appendChild(section);

    const headerElement = section.createChild('div', 'authenticator-section-header');
    const titleElement = headerElement.createChild('div', 'authenticator-section-title');
    UI.ARIAUtils.markAsHeading(titleElement, 2);

    await this._clearActiveAuthenticator();
    const activeButtonContainer = headerElement.createChild('div', 'active-button-container');
    const activeLabel =
        UI.UIUtils.createRadioLabel(`active-authenticator-${authenticatorId}`, i18nString(UIStrings.active));
    activeLabel.radioElement.addEventListener('click', this._setActiveAuthenticator.bind(this, authenticatorId));
    activeButtonContainer.appendChild(activeLabel);
    /** @type {!HTMLInputElement} */ (activeLabel.radioElement as HTMLInputElement).checked = true;
    this._activeAuthId = authenticatorId;  // Newly added authenticator is automatically set as active.

    const removeButton = headerElement.createChild('button', 'text-button');
    removeButton.textContent = i18nString(UIStrings.remove);
    removeButton.addEventListener('click', this._removeAuthenticator.bind(this, authenticatorId));

    const toolbar = new UI.Toolbar.Toolbar('edit-name-toolbar', titleElement);
    const editName = new UI.Toolbar.ToolbarButton(i18nString(UIStrings.editName), 'largeicon-edit');
    const saveName = new UI.Toolbar.ToolbarButton(i18nString(UIStrings.saveName), 'largeicon-checkmark');
    saveName.setVisible(false);

    const nameField = (titleElement.createChild('input', 'authenticator-name-field') as HTMLInputElement);
    nameField.disabled = true;
    const userFriendlyName = authenticatorId.slice(-5);  // User friendly name defaults to last 5 chars of UUID.
    nameField.value = i18nString(UIStrings.authenticatorS, {PH1: userFriendlyName});
    this._updateActiveLabelTitle(activeLabel, nameField.value);

    editName.addEventListener(
        UI.Toolbar.ToolbarButton.Events.Click,
        (): void => this._handleEditNameButton(titleElement, nameField, editName, saveName));
    saveName.addEventListener(
        UI.Toolbar.ToolbarButton.Events.Click,
        (): void => this._handleSaveNameButton(titleElement, nameField, editName, saveName, activeLabel));

    nameField.addEventListener(
        'focusout', (): void => this._handleSaveNameButton(titleElement, nameField, editName, saveName, activeLabel));
    nameField.addEventListener('keydown', (event: KeyboardEvent): void => {
      if (event.key === 'Enter') {
        this._handleSaveNameButton(titleElement, nameField, editName, saveName, activeLabel);
      }
    });

    toolbar.appendToolbarItem(editName);
    toolbar.appendToolbarItem(saveName);

    this._createAuthenticatorFields(section, authenticatorId, options);

    const label = document.createElementWithClass('div', 'credentials-title');
    label.textContent = i18nString(UIStrings.credentials);
    section.appendChild(label);

    const dataGrid = this._createCredentialsDataGrid(authenticatorId);
    dataGrid.asWidget().show(section);

    this._updateCredentials(authenticatorId);

    return section;
  }

  _exportCredential(credential: Protocol.WebAuthn.Credential): void {
    let pem = '-----BEGIN PRIVATE KEY-----\n';
    for (let i = 0; i < credential.privateKey.length; i += 64) {
      pem += credential.privateKey.substring(i, i + 64) + '\n';
    }
    pem += '-----END PRIVATE KEY-----';

    const link = document.createElement('a');
    link.download = i18nString(UIStrings.privateKeypem);
    link.href = 'data:application/x-pem-file,' + encodeURIComponent(pem);
    link.click();
  }

  async _removeCredential(authenticatorId: string, credentialId: string): Promise<void> {
    const dataGrid = this._dataGrids.get(authenticatorId);
    if (!dataGrid) {
      return;
    }

    // @ts-ignore dataGrid node type is indeterminate.
    dataGrid.rootNode()
        .children
        .find((n: DataGrid.DataGrid.DataGridNode<DataGridNode>): boolean => n.data.credentialId === credentialId)
        .remove();
    this._maybeAddEmptyNode(dataGrid);

    if (this._model) {
      await this._model.removeCredential(authenticatorId, credentialId);
    }
  }

  /**
   * Creates the fields describing the authenticator in the front end.
   */
  _createAuthenticatorFields(
      section: Element, authenticatorId: string, options: Protocol.WebAuthn.VirtualAuthenticatorOptions): void {
    const sectionFields = section.createChild('div', 'authenticator-fields');
    const uuidField = sectionFields.createChild('div', 'authenticator-field');
    const protocolField = sectionFields.createChild('div', 'authenticator-field');
    const transportField = sectionFields.createChild('div', 'authenticator-field');
    const srkField = sectionFields.createChild('div', 'authenticator-field');
    const suvField = sectionFields.createChild('div', 'authenticator-field');

    uuidField.appendChild(UI.UIUtils.createLabel(i18nString(UIStrings.uuid), 'authenticator-option-label'));
    protocolField.appendChild(UI.UIUtils.createLabel(i18nString(UIStrings.protocol), 'authenticator-option-label'));
    transportField.appendChild(UI.UIUtils.createLabel(i18nString(UIStrings.transport), 'authenticator-option-label'));
    srkField.appendChild(
        UI.UIUtils.createLabel(i18nString(UIStrings.supportsResidentKeys), 'authenticator-option-label'));
    suvField.appendChild(
        UI.UIUtils.createLabel(i18nString(UIStrings.supportsUserVerification), 'authenticator-option-label'));

    uuidField.createChild('div', 'authenticator-field-value').textContent = authenticatorId;
    protocolField.createChild('div', 'authenticator-field-value').textContent = options.protocol;
    transportField.createChild('div', 'authenticator-field-value').textContent = options.transport;
    srkField.createChild('div', 'authenticator-field-value').textContent =
        options.hasResidentKey ? i18nString(UIStrings.yes) : i18nString(UIStrings.no);
    suvField.createChild('div', 'authenticator-field-value').textContent =
        options.hasUserVerification ? i18nString(UIStrings.yes) : i18nString(UIStrings.no);
  }

  _handleEditNameButton(
      titleElement: Element, nameField: HTMLInputElement, editName: UI.Toolbar.ToolbarButton,
      saveName: UI.Toolbar.ToolbarButton): void {
    nameField.disabled = false;
    titleElement.classList.add('editing-name');
    nameField.focus();
    saveName.setVisible(true);
    editName.setVisible(false);
  }

  _handleSaveNameButton(
      titleElement: Element, nameField: HTMLInputElement, editName: UI.Toolbar.ToolbarItem,
      saveName: UI.Toolbar.ToolbarItem, activeLabel: UI.UIUtils.DevToolsRadioButton): void {
    nameField.disabled = true;
    titleElement.classList.remove('editing-name');
    editName.setVisible(true);
    saveName.setVisible(false);
    this._updateActiveLabelTitle(activeLabel, nameField.value);
  }

  _updateActiveLabelTitle(activeLabel: UI.UIUtils.DevToolsRadioButton, authenticatorName: string): void {
    UI.Tooltip.Tooltip.install(
        activeLabel.radioElement, i18nString(UIStrings.setSAsTheActiveAuthenticator, {PH1: authenticatorName}));
  }

  /**
   * Removes both the authenticator and its respective UI element.
   */
  _removeAuthenticator(authenticatorId: string): void {
    if (this._authenticatorsView) {
      const child = this._authenticatorsView.querySelector(`[data-authenticator-id=${CSS.escape(authenticatorId)}]`);
      if (child) {
        child.remove();
      }
    }
    this._dataGrids.delete(authenticatorId);

    if (this._model) {
      this._model.removeAuthenticator(authenticatorId);
    }

    // Update available authenticator setting.
    const prevAvailableAuthenticators = this._availableAuthenticatorSetting.get();
    const newAvailableAuthenticators = prevAvailableAuthenticators.filter(a => a.authenticatorId !== authenticatorId);
    this._availableAuthenticatorSetting.set(newAvailableAuthenticators);

    if (this._activeAuthId === authenticatorId) {
      const availableAuthenticatorIds = Array.from(this._dataGrids.keys());
      if (availableAuthenticatorIds.length) {
        this._setActiveAuthenticator(availableAuthenticatorIds[0]);
      } else {
        this._activeAuthId = null;
      }
    }
  }

  _createOptionsFromCurrentInputs(): Protocol.WebAuthn.VirtualAuthenticatorOptions {
    // TODO(crbug.com/1034663): Add optionality for isUserVerified param.
    if (!this._protocolSelect || !this._transportSelect || !this._residentKeyCheckbox ||
        !this._userVerificationCheckbox) {
      throw new Error('Unable to create options from current inputs');
    }

    /**
     * @type {!Protocol.WebAuthn.VirtualAuthenticatorOptions}
     */
    const options = ({
      protocol: this._protocolSelect.options[this._protocolSelect.selectedIndex].value,
      transport: this._transportSelect.options[this._transportSelect.selectedIndex].value,
      hasResidentKey: this._residentKeyCheckbox.checked,
      hasUserVerification: this._userVerificationCheckbox.checked,
      automaticPresenceSimulation: true,
      isUserVerified: true,
    } as Protocol.WebAuthn.VirtualAuthenticatorOptions);

    return options;
  }

  /**
   * Sets the given authenticator as active.
   * Note that a newly added authenticator will automatically be set as active.
   */
  async _setActiveAuthenticator(authenticatorId: string): Promise<void> {
    await this._clearActiveAuthenticator();
    if (this._model) {
      await this._model.setAutomaticPresenceSimulation(authenticatorId, true);
    }
    this._activeAuthId = authenticatorId;

    const prevAvailableAuthenticators = this._availableAuthenticatorSetting.get();
    const newAvailableAuthenticators =
        prevAvailableAuthenticators.map(a => ({...a, active: a.authenticatorId === authenticatorId}));
    this._availableAuthenticatorSetting.set(newAvailableAuthenticators);

    this._updateActiveButtons();
  }

  _updateActiveButtons(): void {
    const authenticators = this._authenticatorsView.getElementsByClassName('authenticator-section');
    Array.from(authenticators).forEach((authenticator: Element): void => {
      const button = (authenticator.querySelector('input.dt-radio-button') as HTMLInputElement);
      if (!button) {
        return;
      }
      button.checked =
          /** @type {!HTMLElement} */ (authenticator as HTMLElement).dataset.authenticatorId === this._activeAuthId;
    });
  }

  async _clearActiveAuthenticator(): Promise<void> {
    if (this._activeAuthId && this._model) {
      await this._model.setAutomaticPresenceSimulation(this._activeAuthId, false);
    }
    this._activeAuthId = null;
    this._updateActiveButtons();
  }
}