/**
 * Copyright 2017 Google Inc. All rights reserved.
 * Modifications copyright (c) Microsoft Corporation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import type * as channels from '@protocol/channels';
import type { ConsoleMessage } from './console';
import * as dom from './dom';
import { helper } from './helper';
import type { RegisteredListener } from '../utils/eventsHelper';
import { eventsHelper } from '../utils/eventsHelper';
import * as js from './javascript';
import * as network from './network';
import type { Dialog } from './dialog';
import { Page } from './page';
import * as types from './types';
import { BrowserContext } from './browserContext';
import type { Progress } from './progress';
import { ProgressController } from './progress';
import { assert, constructURLBasedOnBaseURL, makeWaitForNextTask, monotonicTime } from '../utils';
import { ManualPromise } from '../utils/manualPromise';
import { debugLogger } from '../common/debugLogger';
import type { CallMetadata } from './instrumentation';
import { serverSideCallMetadata, SdkObject } from './instrumentation';
import type { InjectedScript, ElementStateWithoutStable, FrameExpectParams, InjectedScriptPoll, InjectedScriptProgress } from './injected/injectedScript';
import { isSessionClosedError } from './protocolError';
import { type ParsedSelector, isInvalidSelectorError } from '../utils/isomorphic/selectorParser';
import type { ScreenshotOptions } from './screenshotter';
import type { InputFilesItems } from './dom';
import { asLocator } from '../utils/isomorphic/locatorGenerators';
import { FrameSelectors } from './frameSelectors';

type ContextData = {
  contextPromise: ManualPromise<dom.FrameExecutionContext | Error>;
  context: dom.FrameExecutionContext | null;
};

type DocumentInfo = {
  // Unfortunately, we don't have documentId when we find out about
  // a pending navigation from things like frameScheduledNavigaiton.
  documentId: string | undefined,
  request: network.Request | undefined,
};

export type GotoResult = {
  newDocumentId?: string,
};

type ConsoleTagHandler = () => void;

type RegularLifecycleEvent = Exclude<types.LifecycleEvent, 'networkidle'>;

export type FunctionWithSource = (source: { context: BrowserContext, page: Page, frame: Frame}, ...args: any) => any;

export type NavigationEvent = {
  // New frame url after navigation.
  url: string,
  // New frame name after navigation.
  name: string,
  // Information about the new document for cross-document navigations.
  // Undefined for same-document navigations.
  newDocument?: DocumentInfo,
  // Error for cross-document navigations if any. When error is present,
  // the navigation did not commit.
  error?: Error,
  // Wether this event should be visible to the clients via the public APIs.
  isPublic?: boolean;
};

export type SchedulableTask<T> = (injectedScript: js.JSHandle<InjectedScript>) => Promise<js.JSHandle<InjectedScriptPoll<T>>>;
export type DomTaskBody<T, R, E> = (progress: InjectedScriptProgress, element: E, data: T, elements: Element[]) => R | symbol;
type ElementCallback<T, R> = (injected: InjectedScript, element: Element, data: T) => R;

export class NavigationAbortedError extends Error {
  readonly documentId?: string;
  constructor(documentId: string | undefined, message: string) {
    super(message);
    this.documentId = documentId;
  }
}

const kDummyFrameId = '<dummy>';

export class FrameManager {
  private _page: Page;
  private _frames = new Map<string, Frame>();
  private _mainFrame: Frame;
  readonly _consoleMessageTags = new Map<string, ConsoleTagHandler>();
  readonly _signalBarriers = new Set<SignalBarrier>();
  private _webSockets = new Map<string, network.WebSocket>();
  _openedDialogs: Set<Dialog> = new Set();
  private _closeAllOpeningDialogs = false;

  constructor(page: Page) {
    this._page = page;
    this._mainFrame = undefined as any as Frame;
  }

  createDummyMainFrameIfNeeded() {
    if (!this._mainFrame)
      this.frameAttached(kDummyFrameId, null);
  }

  dispose() {
    for (const frame of this._frames.values()) {
      frame._stopNetworkIdleTimer();
      frame._invalidateNonStallingEvaluations('Target crashed');
    }
  }

  mainFrame(): Frame {
    return this._mainFrame;
  }

  frames() {
    const frames: Frame[] = [];
    collect(this._mainFrame);
    return frames;

    function collect(frame: Frame) {
      frames.push(frame);
      for (const subframe of frame.childFrames())
        collect(subframe);
    }
  }

  frame(frameId: string): Frame | null {
    return this._frames.get(frameId) || null;
  }

  frameAttached(frameId: string, parentFrameId: string | null | undefined): Frame {
    const parentFrame = parentFrameId ? this._frames.get(parentFrameId)! : null;
    if (!parentFrame) {
      if (this._mainFrame) {
        // Update frame id to retain frame identity on cross-process navigation.
        this._frames.delete(this._mainFrame._id);
        this._mainFrame._id = frameId;
      } else {
        assert(!this._frames.has(frameId));
        this._mainFrame = new Frame(this._page, frameId, parentFrame);
      }
      this._frames.set(frameId, this._mainFrame);
      return this._mainFrame;
    } else {
      assert(!this._frames.has(frameId));
      const frame = new Frame(this._page, frameId, parentFrame);
      this._frames.set(frameId, frame);
      this._page.emit(Page.Events.FrameAttached, frame);
      return frame;
    }
  }

  async waitForSignalsCreatedBy<T>(progress: Progress | null, noWaitAfter: boolean | undefined, action: () => Promise<T>, source?: 'input'): Promise<T> {
    if (noWaitAfter)
      return action();
    const barrier = new SignalBarrier(progress);
    this._signalBarriers.add(barrier);
    if (progress)
      progress.cleanupWhenAborted(() => this._signalBarriers.delete(barrier));
    const result = await action();
    if (source === 'input')
      await this._page._delegate.inputActionEpilogue();
    await barrier.waitFor();
    this._signalBarriers.delete(barrier);
    // Resolve in the next task, after all waitForNavigations.
    await new Promise<void>(makeWaitForNextTask());
    return result;
  }

  frameWillPotentiallyRequestNavigation() {
    for (const barrier of this._signalBarriers)
      barrier.retain();
  }

  frameDidPotentiallyRequestNavigation() {
    for (const barrier of this._signalBarriers)
      barrier.release();
  }

  frameRequestedNavigation(frameId: string, documentId?: string) {
    const frame = this._frames.get(frameId);
    if (!frame)
      return;
    for (const barrier of this._signalBarriers)
      barrier.addFrameNavigation(frame);
    if (frame.pendingDocument() && frame.pendingDocument()!.documentId === documentId) {
      // Do not override request with undefined.
      return;
    }
    frame.setPendingDocument({ documentId, request: undefined });
  }

  frameCommittedNewDocumentNavigation(frameId: string, url: string, name: string, documentId: string, initial: boolean) {
    const frame = this._frames.get(frameId)!;
    this.removeChildFramesRecursively(frame);
    this.clearWebSockets(frame);
    frame._url = url;
    frame._name = name;

    let keepPending: DocumentInfo | undefined;
    const pendingDocument = frame.pendingDocument();
    if (pendingDocument) {
      if (pendingDocument.documentId === undefined) {
        // Pending with unknown documentId - assume it is the one being committed.
        pendingDocument.documentId = documentId;
      }
      if (pendingDocument.documentId === documentId) {
        // Committing a pending document.
        frame._currentDocument = pendingDocument;
      } else {
        // Sometimes, we already have a new pending when the old one commits.
        // An example would be Chromium error page followed by a new navigation request,
        // where the error page commit arrives after Network.requestWillBeSent for the
        // new navigation.
        // We commit, but keep the pending request since it's not done yet.
        keepPending = pendingDocument;
        frame._currentDocument = { documentId, request: undefined };
      }
      frame.setPendingDocument(undefined);
    } else {
      // No pending - just commit a new document.
      frame._currentDocument = { documentId, request: undefined };
    }

    frame._onClearLifecycle();
    const navigationEvent: NavigationEvent = { url, name, newDocument: frame._currentDocument, isPublic: true };
    this._fireInternalFrameNavigation(frame, navigationEvent);
    if (!initial) {
      debugLogger.log('api', `  navigated to "${url}"`);
      this._page.frameNavigatedToNewDocument(frame);
    }
    // Restore pending if any - see comments above about keepPending.
    frame.setPendingDocument(keepPending);
  }

  frameCommittedSameDocumentNavigation(frameId: string, url: string) {
    const frame = this._frames.get(frameId);
    if (!frame)
      return;
    frame._url = url;
    const navigationEvent: NavigationEvent = { url, name: frame._name, isPublic: true };
    this._fireInternalFrameNavigation(frame, navigationEvent);
    debugLogger.log('api', `  navigated to "${url}"`);
  }

  frameAbortedNavigation(frameId: string, errorText: string, documentId?: string) {
    const frame = this._frames.get(frameId);
    if (!frame || !frame.pendingDocument())
      return;
    if (documentId !== undefined && frame.pendingDocument()!.documentId !== documentId)
      return;
    const navigationEvent: NavigationEvent = {
      url: frame._url,
      name: frame._name,
      newDocument: frame.pendingDocument(),
      error: new NavigationAbortedError(documentId, errorText),
      isPublic: !(documentId && frame._redirectedNavigations.has(documentId)),
    };
    frame.setPendingDocument(undefined);
    this._fireInternalFrameNavigation(frame, navigationEvent);
  }

  frameDetached(frameId: string) {
    const frame = this._frames.get(frameId);
    if (frame) {
      this._removeFramesRecursively(frame);
      this._page.mainFrame()._recalculateNetworkIdle();
    }
  }

  frameLifecycleEvent(frameId: string, event: RegularLifecycleEvent) {
    const frame = this._frames.get(frameId);
    if (frame)
      frame._onLifecycleEvent(event);
  }

  requestStarted(request: network.Request, route?: network.RouteDelegate) {
    const frame = request.frame()!;
    this._inflightRequestStarted(request);
    if (request._documentId)
      frame.setPendingDocument({ documentId: request._documentId, request });
    if (request._isFavicon) {
      if (route)
        route.continue(request, {});
      return;
    }
    this._page.emitOnContext(BrowserContext.Events.Request, request);
    if (route) {
      const r = new network.Route(request, route);
      if (this._page._serverRequestInterceptor?.(r, request))
        return;
      if (this._page._clientRequestInterceptor?.(r, request))
        return;
      if (this._page._browserContext._requestInterceptor?.(r, request))
        return;
      r.continue();
    }
  }

  requestReceivedResponse(response: network.Response) {
    if (response.request()._isFavicon)
      return;
    this._page.emitOnContext(BrowserContext.Events.Response, response);
  }

  reportRequestFinished(request: network.Request, response: network.Response | null) {
    this._inflightRequestFinished(request);
    if (request._isFavicon)
      return;
    this._page.emitOnContext(BrowserContext.Events.RequestFinished, { request, response });
  }

  requestFailed(request: network.Request, canceled: boolean) {
    const frame = request.frame()!;
    this._inflightRequestFinished(request);
    if (frame.pendingDocument() && frame.pendingDocument()!.request === request) {
      let errorText = request.failure()!.errorText;
      if (canceled)
        errorText += '; maybe frame was detached?';
      this.frameAbortedNavigation(frame._id, errorText, frame.pendingDocument()!.documentId);
    }
    if (request._isFavicon)
      return;
    this._page.emitOnContext(BrowserContext.Events.RequestFailed, request);
  }

  dialogDidOpen(dialog: Dialog) {
    // Any ongoing evaluations will be stalled until the dialog is closed.
    for (const frame of this._frames.values())
      frame._invalidateNonStallingEvaluations('JavaScript dialog interrupted evaluation');
    if (this._closeAllOpeningDialogs)
      dialog.close().then(() => {});
    else
      this._openedDialogs.add(dialog);
  }

  dialogWillClose(dialog: Dialog) {
    this._openedDialogs.delete(dialog);
  }

  async closeOpenDialogs() {
    await Promise.all([...this._openedDialogs].map(dialog => dialog.close())).catch(() => {});
    this._openedDialogs.clear();
  }

  setCloseAllOpeningDialogs(closeDialogs: boolean) {
    this._closeAllOpeningDialogs = closeDialogs;
  }

  removeChildFramesRecursively(frame: Frame) {
    for (const child of frame.childFrames())
      this._removeFramesRecursively(child);
  }

  private _removeFramesRecursively(frame: Frame) {
    this.removeChildFramesRecursively(frame);
    frame._onDetached();
    this._frames.delete(frame._id);
    if (!this._page.isClosed())
      this._page.emit(Page.Events.FrameDetached, frame);
  }

  private _inflightRequestFinished(request: network.Request) {
    const frame = request.frame()!;
    if (request._isFavicon)
      return;
    if (!frame._inflightRequests.has(request))
      return;
    frame._inflightRequests.delete(request);
    if (frame._inflightRequests.size === 0)
      frame._startNetworkIdleTimer();
  }

  private _inflightRequestStarted(request: network.Request) {
    const frame = request.frame()!;
    if (request._isFavicon)
      return;
    frame._inflightRequests.add(request);
    if (frame._inflightRequests.size === 1)
      frame._stopNetworkIdleTimer();
  }

  interceptConsoleMessage(message: ConsoleMessage): boolean {
    if (message.type() !== 'debug')
      return false;
    const tag = message.text();
    const handler = this._consoleMessageTags.get(tag);
    if (!handler)
      return false;
    this._consoleMessageTags.delete(tag);
    handler();
    return true;
  }

  clearWebSockets(frame: Frame) {
    // TODO: attribute sockets to frames.
    if (frame.parentFrame())
      return;
    this._webSockets.clear();
  }

  onWebSocketCreated(requestId: string, url: string) {
    const ws = new network.WebSocket(this._page, url);
    this._webSockets.set(requestId, ws);
  }

  onWebSocketRequest(requestId: string) {
    const ws = this._webSockets.get(requestId);
    if (ws && ws.markAsNotified())
      this._page.emit(Page.Events.WebSocket, ws);
  }

  onWebSocketResponse(requestId: string, status: number, statusText: string) {
    const ws = this._webSockets.get(requestId);
    if (status < 400)
      return;
    if (ws)
      ws.error(`${statusText}: ${status}`);
  }

  onWebSocketFrameSent(requestId: string, opcode: number, data: string) {
    const ws = this._webSockets.get(requestId);
    if (ws)
      ws.frameSent(opcode, data);
  }

  webSocketFrameReceived(requestId: string, opcode: number, data: string) {
    const ws = this._webSockets.get(requestId);
    if (ws)
      ws.frameReceived(opcode, data);
  }

  webSocketClosed(requestId: string) {
    const ws = this._webSockets.get(requestId);
    if (ws)
      ws.closed();
    this._webSockets.delete(requestId);
  }

  webSocketError(requestId: string, errorMessage: string): void {
    const ws = this._webSockets.get(requestId);
    if (ws)
      ws.error(errorMessage);
  }

  private _fireInternalFrameNavigation(frame: Frame, event: NavigationEvent) {
    frame.emit(Frame.Events.InternalNavigation, event);
  }
}

export class Frame extends SdkObject {
  static Events = {
    InternalNavigation: 'internalnavigation',
    AddLifecycle: 'addlifecycle',
    RemoveLifecycle: 'removelifecycle',
  };

  _id: string;
  _firedLifecycleEvents = new Set<types.LifecycleEvent>();
  private _firedNetworkIdleSelf = false;
  _currentDocument: DocumentInfo;
  private _pendingDocument: DocumentInfo | undefined;
  readonly _page: Page;
  private _parentFrame: Frame | null;
  _url = '';
  private _detached = false;
  private _contextData = new Map<types.World, ContextData>();
  private _childFrames = new Set<Frame>();
  _name = '';
  _inflightRequests = new Set<network.Request>();
  private _networkIdleTimer: NodeJS.Timer | undefined;
  private _setContentCounter = 0;
  readonly _detachedPromise: Promise<void>;
  private _detachedCallback = () => {};
  private _raceAgainstEvaluationStallingEventsPromises = new Set<ManualPromise<any>>();
  readonly _redirectedNavigations = new Map<string, { url: string, gotoPromise: Promise<network.Response | null> }>(); // documentId -> data
  readonly selectors: FrameSelectors;

  constructor(page: Page, id: string, parentFrame: Frame | null) {
    super(page, 'frame');
    this.attribution.frame = this;
    this._id = id;
    this._page = page;
    this._parentFrame = parentFrame;
    this._currentDocument = { documentId: undefined, request: undefined };
    this.selectors = new FrameSelectors(this);

    this._detachedPromise = new Promise<void>(x => this._detachedCallback = x);

    this._contextData.set('main', { contextPromise: new ManualPromise(), context: null });
    this._contextData.set('utility', { contextPromise: new ManualPromise(), context: null });
    this._setContext('main', null);
    this._setContext('utility', null);

    if (this._parentFrame)
      this._parentFrame._childFrames.add(this);

    this._firedLifecycleEvents.add('commit');
    if (id !== kDummyFrameId)
      this._startNetworkIdleTimer();
  }

  isDetached(): boolean {
    return this._detached;
  }

  _onLifecycleEvent(event: RegularLifecycleEvent) {
    if (this._firedLifecycleEvents.has(event))
      return;
    this._firedLifecycleEvents.add(event);
    this.emit(Frame.Events.AddLifecycle, event);
    if (this === this._page.mainFrame() && this._url !== 'about:blank')
      debugLogger.log('api', `  "${event}" event fired`);
    this._page.mainFrame()._recalculateNetworkIdle();
  }

  _onClearLifecycle() {
    for (const event of this._firedLifecycleEvents)
      this.emit(Frame.Events.RemoveLifecycle, event);
    this._firedLifecycleEvents.clear();
    // Keep the current navigation request if any.
    this._inflightRequests = new Set(Array.from(this._inflightRequests).filter(request => request === this._currentDocument.request));
    this._stopNetworkIdleTimer();
    if (this._inflightRequests.size === 0)
      this._startNetworkIdleTimer();
    this._page.mainFrame()._recalculateNetworkIdle(this);
    this._onLifecycleEvent('commit');
  }

  setPendingDocument(documentInfo: DocumentInfo | undefined) {
    this._pendingDocument = documentInfo;
    if (documentInfo)
      this._invalidateNonStallingEvaluations('Navigation interrupted the evaluation');
  }

  pendingDocument(): DocumentInfo | undefined {
    return this._pendingDocument;
  }

  _invalidateNonStallingEvaluations(message: string) {
    if (!this._raceAgainstEvaluationStallingEventsPromises.size)
      return;
    const error = new Error(message);
    for (const promise of this._raceAgainstEvaluationStallingEventsPromises)
      promise.reject(error);
  }

  async raceAgainstEvaluationStallingEvents<T>(cb: () => Promise<T>): Promise<T> {
    if (this._pendingDocument)
      throw new Error('Frame is currently attempting a navigation');
    if (this._page._frameManager._openedDialogs.size)
      throw new Error('Open JavaScript dialog prevents evaluation');

    const promise = new ManualPromise<T>();
    this._raceAgainstEvaluationStallingEventsPromises.add(promise);
    try {
      return await Promise.race([
        cb(),
        promise
      ]);
    } finally {
      this._raceAgainstEvaluationStallingEventsPromises.delete(promise);
    }
  }

  nonStallingRawEvaluateInExistingMainContext(expression: string): Promise<any> {
    return this.raceAgainstEvaluationStallingEvents(() => {
      const context = this._existingMainContext();
      if (!context)
        throw new Error('Frame does not yet have a main execution context');
      return context.rawEvaluateJSON(expression);
    });
  }

  nonStallingEvaluateInExistingContext(expression: string, isFunction: boolean | undefined, world: types.World): Promise<any> {
    return this.raceAgainstEvaluationStallingEvents(() => {
      const context = this._contextData.get(world)?.context;
      if (!context)
        throw new Error('Frame does not yet have the execution context');
      return context.evaluateExpression(expression, { isFunction });
    });
  }

  _recalculateNetworkIdle(frameThatAllowsRemovingNetworkIdle?: Frame) {
    let isNetworkIdle = this._firedNetworkIdleSelf;
    for (const child of this._childFrames) {
      child._recalculateNetworkIdle(frameThatAllowsRemovingNetworkIdle);
      // We require networkidle event to be fired in the whole frame subtree, and then consider it done.
      if (!child._firedLifecycleEvents.has('networkidle'))
        isNetworkIdle = false;
    }
    if (isNetworkIdle && !this._firedLifecycleEvents.has('networkidle')) {
      this._firedLifecycleEvents.add('networkidle');
      this.emit(Frame.Events.AddLifecycle, 'networkidle');
      if (this === this._page.mainFrame() && this._url !== 'about:blank')
        debugLogger.log('api', `  "networkidle" event fired`);
    }
    if (frameThatAllowsRemovingNetworkIdle !== this && this._firedLifecycleEvents.has('networkidle') && !isNetworkIdle) {
      // Usually, networkidle is fired once and not removed after that.
      // However, when we clear them right before a new commit, this is allowed for a particular frame.
      this._firedLifecycleEvents.delete('networkidle');
      this.emit(Frame.Events.RemoveLifecycle, 'networkidle');
    }
  }

  async raceNavigationAction(progress: Progress, options: types.GotoOptions, action: () => Promise<network.Response | null>): Promise<network.Response | null> {
    return Promise.race([
      this._page._disconnectedPromise.then(() => { throw new Error('Navigation failed because page was closed!'); }),
      this._page._crashedPromise.then(() => { throw new Error('Navigation failed because page crashed!'); }),
      this._detachedPromise.then(() => { throw new Error('Navigating frame was detached!'); }),
      action().catch(e => {
        if (e instanceof NavigationAbortedError && e.documentId) {
          const data = this._redirectedNavigations.get(e.documentId);
          if (data) {
            progress.log(`waiting for redirected navigation to "${data.url}"`);
            return data.gotoPromise;
          }
        }
        throw e;
      }),
    ]);
  }

  redirectNavigation(url: string, documentId: string, referer: string | undefined) {
    const controller = new ProgressController(serverSideCallMetadata(), this);
    const data = {
      url,
      gotoPromise: controller.run(progress => this._gotoAction(progress, url, { referer }), 0),
    };
    this._redirectedNavigations.set(documentId, data);
    data.gotoPromise.finally(() => this._redirectedNavigations.delete(documentId));
  }

  async goto(metadata: CallMetadata, url: string, options: types.GotoOptions = {}): Promise<network.Response | null> {
    const constructedNavigationURL = constructURLBasedOnBaseURL(this._page._browserContext._options.baseURL, url);
    const controller = new ProgressController(metadata, this);
    return controller.run(progress => this._goto(progress, constructedNavigationURL, options), this._page._timeoutSettings.navigationTimeout(options));
  }

  private async _goto(progress: Progress, url: string, options: types.GotoOptions): Promise<network.Response | null> {
    return this.raceNavigationAction(progress, options, async () => this._gotoAction(progress, url, options));
  }

  private async _gotoAction(progress: Progress, url: string, options: types.GotoOptions): Promise<network.Response | null> {
    const waitUntil = verifyLifecycle('waitUntil', options.waitUntil === undefined ? 'load' : options.waitUntil);
    progress.log(`navigating to "${url}", waiting until "${waitUntil}"`);
    const headers = this._page.extraHTTPHeaders() || [];
    const refererHeader = headers.find(h => h.name.toLowerCase() === 'referer');
    let referer = refererHeader ? refererHeader.value : undefined;
    if (options.referer !== undefined) {
      if (referer !== undefined && referer !== options.referer)
        throw new Error('"referer" is already specified as extra HTTP header');
      referer = options.referer;
    }
    url = helper.completeUserURL(url);

    const sameDocument = helper.waitForEvent(progress, this, Frame.Events.InternalNavigation, (e: NavigationEvent) => !e.newDocument);
    const navigateResult = await this._page._delegate.navigateFrame(this, url, referer);

    let event: NavigationEvent;
    if (navigateResult.newDocumentId) {
      sameDocument.dispose();
      event = await helper.waitForEvent(progress, this, Frame.Events.InternalNavigation, (event: NavigationEvent) => {
        // We are interested either in this specific document, or any other document that
        // did commit and replaced the expected document.
        return event.newDocument && (event.newDocument.documentId === navigateResult.newDocumentId || !event.error);
      }).promise;

      if (event.newDocument!.documentId !== navigateResult.newDocumentId) {
        // This is just a sanity check. In practice, new navigation should
        // cancel the previous one and report "request cancelled"-like error.
        throw new NavigationAbortedError(navigateResult.newDocumentId, 'Navigation interrupted by another one');
      }
      if (event.error)
        throw event.error;
    } else {
      event = await sameDocument.promise;
    }

    if (!this._firedLifecycleEvents.has(waitUntil))
      await helper.waitForEvent(progress, this, Frame.Events.AddLifecycle, (e: types.LifecycleEvent) => e === waitUntil).promise;

    const request = event.newDocument ? event.newDocument.request : undefined;
    const response = request ? request._finalRequest().response() : null;
    return response;
  }

  async _waitForNavigation(progress: Progress, requiresNewDocument: boolean, options: types.NavigateOptions): Promise<network.Response | null> {
    const waitUntil = verifyLifecycle('waitUntil', options.waitUntil === undefined ? 'load' : options.waitUntil);
    progress.log(`waiting for navigation until "${waitUntil}"`);

    const navigationEvent: NavigationEvent = await helper.waitForEvent(progress, this, Frame.Events.InternalNavigation, (event: NavigationEvent) => {
      // Any failed navigation results in a rejection.
      if (event.error)
        return true;
      if (requiresNewDocument && !event.newDocument)
        return false;
      progress.log(`  navigated to "${this._url}"`);
      return true;
    }).promise;
    if (navigationEvent.error)
      throw navigationEvent.error;

    if (!this._firedLifecycleEvents.has(waitUntil))
      await helper.waitForEvent(progress, this, Frame.Events.AddLifecycle, (e: types.LifecycleEvent) => e === waitUntil).promise;

    const request = navigationEvent.newDocument ? navigationEvent.newDocument.request : undefined;
    return request ? request._finalRequest().response() : null;
  }

  async _waitForLoadState(progress: Progress, state: types.LifecycleEvent): Promise<void> {
    const waitUntil = verifyLifecycle('state', state);
    if (!this._firedLifecycleEvents.has(waitUntil))
      await helper.waitForEvent(progress, this, Frame.Events.AddLifecycle, (e: types.LifecycleEvent) => e === waitUntil).promise;
  }

  async frameElement(): Promise<dom.ElementHandle> {
    return this._page._delegate.getFrameElement(this);
  }

  _context(world: types.World): Promise<dom.FrameExecutionContext> {
    return this._contextData.get(world)!.contextPromise.then(contextOrError => {
      if (contextOrError instanceof js.ExecutionContext)
        return contextOrError;
      throw contextOrError;
    });
  }

  _mainContext(): Promise<dom.FrameExecutionContext> {
    return this._context('main');
  }

  private _existingMainContext(): dom.FrameExecutionContext | null {
    return this._contextData.get('main')?.context || null;
  }

  _utilityContext(): Promise<dom.FrameExecutionContext> {
    return this._context('utility');
  }

  async evaluateExpressionHandleAndWaitForSignals(expression: string, isFunction: boolean | undefined, arg: any, world: types.World = 'main'): Promise<any> {
    const context = await this._context(world);
    const handle = await context.evaluateExpressionHandleAndWaitForSignals(expression, { isFunction }, arg);
    return handle;
  }

  async evaluateExpression(expression: string, isFunction: boolean | undefined, arg: any, world: types.World = 'main'): Promise<any> {
    const context = await this._context(world);
    const value = await context.evaluateExpression(expression, { isFunction }, arg);
    return value;
  }

  async evaluateExpressionAndWaitForSignals(expression: string, options: { isFunction?: boolean, exposeUtilityScript?: boolean }, arg: any, world: types.World = 'main'): Promise<any> {
    const context = await this._context(world);
    const value = await context.evaluateExpressionAndWaitForSignals(expression, options, arg);
    return value;
  }

  async querySelector(selector: string, options: types.StrictOptions): Promise<dom.ElementHandle<Element> | null> {
    debugLogger.log('api', `    finding element using the selector "${selector}"`);
    return this.selectors.query(selector, options);
  }

  async waitForSelector(metadata: CallMetadata, selector: string, options: types.WaitForElementOptions, scope?: dom.ElementHandle): Promise<dom.ElementHandle<Element> | null> {
    const controller = new ProgressController(metadata, this);
    if ((options as any).visibility)
      throw new Error('options.visibility is not supported, did you mean options.state?');
    if ((options as any).waitFor && (options as any).waitFor !== 'visible')
      throw new Error('options.waitFor is not supported, did you mean options.state?');
    const { state = 'visible' } = options;
    if (!['attached', 'detached', 'visible', 'hidden'].includes(state))
      throw new Error(`state: expected one of (attached|detached|visible|hidden)`);
    return controller.run(async progress => {
      progress.log(`waiting for ${this._asLocator(selector)}${state === 'attached' ? '' : ' to be ' + state}`);
      const promise = this.retryWithProgressAndTimeouts(progress, [0, 20, 50, 100, 100, 500], async continuePolling => {
        const resolved = await this.selectors.resolveInjectedForSelector(selector, options, scope);
        progress.throwIfAborted();
        if (!resolved)
          return continuePolling;
        const result = await resolved.injected.evaluateHandle((injected, { info, root }) => {
          const elements = injected.querySelectorAll(info.parsed, root || document);
          const element: Element | undefined  = elements[0];
          const visible = element ? injected.isVisible(element) : false;
          let log = '';
          if (elements.length > 1) {
            if (info.strict)
              throw injected.strictModeViolationError(info.parsed, elements);
            log = `  locator resolved to ${elements.length} elements. Proceeding with the first one: ${injected.previewNode(elements[0])}`;
          } else if (element) {
            log = `  locator resolved to ${visible ? 'visible' : 'hidden'} ${injected.previewNode(element)}`;
          }
          return { log, element, visible, attached: !!element };
        }, { info: resolved.info, root: resolved.frame === this ? scope : undefined });
        const { log, visible, attached } = await result.evaluate(r => ({ log: r.log, visible: r.visible, attached: r.attached }));
        if (log)
          progress.log(log);
        const success = { attached, detached: !attached, visible, hidden: !visible }[state];
        if (!success) {
          result.dispose();
          return continuePolling;
        }
        const element = state === 'attached' || state === 'visible' ? await result.evaluateHandle(r => r.element) : null;
        result.dispose();
        if (!element)
          return null;
        if ((options as any).__testHookBeforeAdoptNode)
          await (options as any).__testHookBeforeAdoptNode();
        try {
          return await element._adoptTo(await resolved.frame._mainContext());
        } catch (e) {
          return continuePolling;
        }
      });
      return scope ? scope._context._raceAgainstContextDestroyed(promise) : promise;
    }, this._page._timeoutSettings.timeout(options));
  }

  async dispatchEvent(metadata: CallMetadata, selector: string, type: string, eventInit: Object = {}, options: types.QueryOnSelectorOptions = {}): Promise<void> {
    await this._callOnElementOnceMatches(metadata, selector, (injectedScript, element, data) => {
      injectedScript.dispatchEvent(element, data.type, data.eventInit);
    }, { type, eventInit }, { mainWorld: true, ...options });
  }

  async evalOnSelectorAndWaitForSignals(selector: string, strict: boolean, expression: string, isFunction: boolean | undefined, arg: any): Promise<any> {
    const handle = await this.selectors.query(selector, { strict });
    if (!handle)
      throw new Error(`Error: failed to find element matching selector "${selector}"`);
    const result = await handle.evaluateExpressionAndWaitForSignals(expression, isFunction, true, arg);
    handle.dispose();
    return result;
  }

  async evalOnSelectorAllAndWaitForSignals(selector: string, expression: string, isFunction: boolean | undefined, arg: any): Promise<any> {
    const arrayHandle = await this.selectors.queryArrayInMainWorld(selector);
    const result = await arrayHandle.evaluateExpressionAndWaitForSignals(expression, isFunction, true, arg);
    arrayHandle.dispose();
    return result;
  }

  async maskSelectors(selectors: ParsedSelector[]): Promise<void> {
    const context = await this._utilityContext();
    const injectedScript = await context.injectedScript();
    await injectedScript.evaluate((injected, { parsed }) => {
      injected.maskSelectors(parsed);
    }, { parsed: selectors });
  }

  async querySelectorAll(selector: string): Promise<dom.ElementHandle<Element>[]> {
    return this.selectors.queryAll(selector);
  }

  async queryCount(selector: string): Promise<number> {
    return await this.selectors.queryCount(selector);
  }

  async content(): Promise<string> {
    try {
      const context = await this._utilityContext();
      return await context.evaluate(() => {
        let retVal = '';
        if (document.doctype)
          retVal = new XMLSerializer().serializeToString(document.doctype);
        if (document.documentElement)
          retVal += document.documentElement.outerHTML;
        return retVal;
      });
    } catch (e) {
      if (js.isJavaScriptErrorInEvaluate(e) || isSessionClosedError(e))
        throw e;
      throw new Error(`Unable to retrieve content because the page is navigating and changing the content.`);
    }
  }

  async setContent(metadata: CallMetadata, html: string, options: types.NavigateOptions = {}): Promise<void> {
    const controller = new ProgressController(metadata, this);
    return controller.run(async progress => {
      await this.raceNavigationAction(progress, options, async () => {
        const waitUntil = options.waitUntil === undefined ? 'load' : options.waitUntil;
        progress.log(`setting frame content, waiting until "${waitUntil}"`);
        const tag = `--playwright--set--content--${this._id}--${++this._setContentCounter}--`;
        const context = await this._utilityContext();
        const lifecyclePromise = new Promise((resolve, reject) => {
          this._page._frameManager._consoleMessageTags.set(tag, () => {
            // Clear lifecycle right after document.open() - see 'tag' below.
            this._onClearLifecycle();
            this._waitForLoadState(progress, waitUntil).then(resolve).catch(reject);
          });
        });
        const contentPromise = context.evaluate(({ html, tag }) => {
          window.stop();
          document.open();
          console.debug(tag);  // eslint-disable-line no-console
          document.write(html);
          document.close();
        }, { html, tag });
        await Promise.all([contentPromise, lifecyclePromise]);
        return null;
      });
    }, this._page._timeoutSettings.navigationTimeout(options));
  }

  name(): string {
    return this._name || '';
  }

  url(): string {
    return this._url;
  }

  parentFrame(): Frame | null {
    return this._parentFrame;
  }

  childFrames(): Frame[] {
    return Array.from(this._childFrames);
  }

  async addScriptTag(params: {
      url?: string,
      content?: string,
      type?: string,
    }): Promise<dom.ElementHandle> {
    const {
      url = null,
      content = null,
      type = ''
    } = params;
    if (!url && !content)
      throw new Error('Provide an object with a `url`, `path` or `content` property');

    const context = await this._mainContext();
    return this._raceWithCSPError(async () => {
      if (url !== null)
        return (await context.evaluateHandle(addScriptUrl, { url, type })).asElement()!;
      const result = (await context.evaluateHandle(addScriptContent, { content: content!, type })).asElement()!;
      // Another round trip to the browser to ensure that we receive CSP error messages
      // (if any) logged asynchronously in a separate task on the content main thread.
      if (this._page._delegate.cspErrorsAsynchronousForInlineScipts)
        await context.evaluate(() => true);
      return result;
    });

    async function addScriptUrl(params: { url: string, type: string }): Promise<HTMLElement> {
      const script = document.createElement('script');
      script.src = params.url;
      if (params.type)
        script.type = params.type;
      const promise = new Promise((res, rej) => {
        script.onload = res;
        script.onerror = e => rej(typeof e === 'string' ? new Error(e) : new Error(`Failed to load script at ${script.src}`));
      });
      document.head.appendChild(script);
      await promise;
      return script;
    }

    function addScriptContent(params: { content: string, type: string }): HTMLElement {
      const script = document.createElement('script');
      script.type = params.type || 'text/javascript';
      script.text = params.content;
      let error = null;
      script.onerror = e => error = e;
      document.head.appendChild(script);
      if (error)
        throw error;
      return script;
    }
  }

  async addStyleTag(params: { url?: string, content?: string }): Promise<dom.ElementHandle> {
    const {
      url = null,
      content = null
    } = params;
    if (!url && !content)
      throw new Error('Provide an object with a `url`, `path` or `content` property');

    const context = await this._mainContext();
    return this._raceWithCSPError(async () => {
      if (url !== null)
        return (await context.evaluateHandle(addStyleUrl, url)).asElement()!;
      return (await context.evaluateHandle(addStyleContent, content!)).asElement()!;
    });

    async function addStyleUrl(url: string): Promise<HTMLElement> {
      const link = document.createElement('link');
      link.rel = 'stylesheet';
      link.href = url;
      const promise = new Promise((res, rej) => {
        link.onload = res;
        link.onerror = rej;
      });
      document.head.appendChild(link);
      await promise;
      return link;
    }

    async function addStyleContent(content: string): Promise<HTMLElement> {
      const style = document.createElement('style');
      style.type = 'text/css';
      style.appendChild(document.createTextNode(content));
      const promise = new Promise((res, rej) => {
        style.onload = res;
        style.onerror = rej;
      });
      document.head.appendChild(style);
      await promise;
      return style;
    }
  }

  private async _raceWithCSPError(func: () => Promise<dom.ElementHandle>): Promise<dom.ElementHandle> {
    const listeners: RegisteredListener[] = [];
    let result: dom.ElementHandle;
    let error: Error | undefined;
    let cspMessage: ConsoleMessage | undefined;
    const actionPromise = func().then(r => result = r).catch(e => error = e);
    const errorPromise = new Promise<void>(resolve => {
      listeners.push(eventsHelper.addEventListener(this._page, Page.Events.Console, (message: ConsoleMessage) => {
        if (message.type() === 'error' && message.text().includes('Content Security Policy')) {
          cspMessage = message;
          resolve();
        }
      }));
    });
    await Promise.race([actionPromise, errorPromise]);
    eventsHelper.removeEventListeners(listeners);
    if (cspMessage)
      throw new Error(cspMessage.text());
    if (error)
      throw error;
    return result!;
  }

  async retryWithProgressAndTimeouts<R>(progress: Progress, timeouts: number[], action: (continuePolling: symbol) => Promise<R | symbol>): Promise<R> {
    const continuePolling = Symbol('continuePolling');
    timeouts = [0, ...timeouts];
    let timeoutIndex = 0;
    while (progress.isRunning()) {
      const timeout = timeouts[Math.min(timeoutIndex++, timeouts.length - 1)];
      if (timeout) {
        // Make sure we react immediately upon page close or frame detach.
        // We need this to show expected/received values in time.
        await Promise.race([
          this._page._disconnectedPromise,
          this._page._crashedPromise,
          this._detachedPromise,
          new Promise(f => setTimeout(f, timeout)),
        ]);
      }
      progress.throwIfAborted();
      try {
        const result = await action(continuePolling);
        if (result === continuePolling)
          continue;
        return result as R;
      } catch (e) {
        if (this._isErrorThatCannotBeRetried(e))
          throw e;
        continue;
      }
    }
    progress.throwIfAborted();
    return undefined as any;
  }

  private _isErrorThatCannotBeRetried(e: Error) {
    // Always fail on JavaScript errors or when the main connection is closed.
    if (js.isJavaScriptErrorInEvaluate(e) || isSessionClosedError(e))
      return true;
    // Certain errors opt-out of the retries, throw.
    if (dom.isNonRecoverableDOMError(e) || isInvalidSelectorError(e))
      return true;
    // If the call is made on the detached frame - throw.
    if (this.isDetached())
      return true;
    // Retry upon all other errors.
    return false;
  }

  private async _retryWithProgressIfNotConnected<R>(
    progress: Progress,
    selector: string,
    strict: boolean | undefined,
    action: (handle: dom.ElementHandle<Element>) => Promise<R | 'error:notconnected'>): Promise<R> {
    progress.log(`waiting for ${this._asLocator(selector)}`);
    return this.retryWithProgressAndTimeouts(progress, [0, 20, 50, 100, 100, 500], async continuePolling => {
      const resolved = await this.selectors.resolveInjectedForSelector(selector, { strict });
      progress.throwIfAborted();
      if (!resolved)
        return continuePolling;
      const result = await resolved.injected.evaluateHandle((injected, { info }) => {
        const elements = injected.querySelectorAll(info.parsed, document);
        const element = elements[0] as Element | undefined;
        let log = '';
        if (elements.length > 1) {
          if (info.strict)
            throw injected.strictModeViolationError(info.parsed, elements);
          log = `  locator resolved to ${elements.length} elements. Proceeding with the first one: ${injected.previewNode(elements[0])}`;
        } else if (element) {
          log = `  locator resolved to ${injected.previewNode(element)}`;
        }
        return { log, success: !!element, element };
      }, { info: resolved.info });
      const { log, success } = await result.evaluate(r => ({ log: r.log, success: r.success }));
      if (log)
        progress.log(log);
      if (!success) {
        result.dispose();
        return continuePolling;
      }
      const element = await result.evaluateHandle(r => r.element) as dom.ElementHandle<Element>;
      result.dispose();
      try {
        const result = await action(element);
        if (result === 'error:notconnected') {
          progress.log('element was detached from the DOM, retrying');
          return continuePolling;
        }
        return result;
      } finally {
        element?.dispose();
      }
    });
  }

  async rafrafTimeoutScreenshotElementWithProgress(progress: Progress, selector: string, timeout: number, options: ScreenshotOptions): Promise<Buffer> {
    return await this._retryWithProgressIfNotConnected(progress, selector, true /* strict */, async handle => {
      await handle._frame.rafrafTimeout(timeout);
      return await this._page._screenshotter.screenshotElement(progress, handle, options);
    });
  }

  async click(metadata: CallMetadata, selector: string, options: types.MouseClickOptions & types.PointerActionWaitOptions & types.NavigatingActionWaitOptions) {
    const controller = new ProgressController(metadata, this);
    return controller.run(async progress => {
      return dom.assertDone(await this._retryWithProgressIfNotConnected(progress, selector, options.strict, handle => handle._click(progress, options)));
    }, this._page._timeoutSettings.timeout(options));
  }

  async dblclick(metadata: CallMetadata, selector: string, options: types.MouseMultiClickOptions & types.PointerActionWaitOptions & types.NavigatingActionWaitOptions = {}) {
    const controller = new ProgressController(metadata, this);
    return controller.run(async progress => {
      return dom.assertDone(await this._retryWithProgressIfNotConnected(progress, selector, options.strict, handle => handle._dblclick(progress, options)));
    }, this._page._timeoutSettings.timeout(options));
  }

  async dragAndDrop(metadata: CallMetadata, source: string, target: string,  options: types.DragActionOptions & types.PointerActionWaitOptions & types.NavigatingActionWaitOptions = {}) {
    const controller = new ProgressController(metadata, this);
    await controller.run(async progress => {
      dom.assertDone(await this._retryWithProgressIfNotConnected(progress, source, options.strict, async handle => {
        return handle._retryPointerAction(progress, 'move and down', false, async point => {
          await this._page.mouse.move(point.x, point.y);
          await this._page.mouse.down();
        }, {
          ...options,
          position: options.sourcePosition,
          timeout: progress.timeUntilDeadline(),
        });
      }));
      dom.assertDone(await this._retryWithProgressIfNotConnected(progress, target, options.strict, async handle => {
        return handle._retryPointerAction(progress, 'move and up', false, async point => {
          await this._page.mouse.move(point.x, point.y);
          await this._page.mouse.up();
        }, {
          ...options,
          position: options.targetPosition,
          timeout: progress.timeUntilDeadline(),
        });
      }));
    }, this._page._timeoutSettings.timeout(options));
  }

  async tap(metadata: CallMetadata, selector: string, options: types.PointerActionWaitOptions & types.NavigatingActionWaitOptions) {
    if (!this._page._browserContext._options.hasTouch)
      throw new Error('The page does not support tap. Use hasTouch context option to enable touch support.');
    const controller = new ProgressController(metadata, this);
    return controller.run(async progress => {
      return dom.assertDone(await this._retryWithProgressIfNotConnected(progress, selector, options.strict, handle => handle._tap(progress, options)));
    }, this._page._timeoutSettings.timeout(options));
  }

  async fill(metadata: CallMetadata, selector: string, value: string, options: types.NavigatingActionWaitOptions & { force?: boolean }) {
    const controller = new ProgressController(metadata, this);
    return controller.run(async progress => {
      return dom.assertDone(await this._retryWithProgressIfNotConnected(progress, selector, options.strict, handle => handle._fill(progress, value, options)));
    }, this._page._timeoutSettings.timeout(options));
  }

  async focus(metadata: CallMetadata, selector: string, options: types.TimeoutOptions & types.StrictOptions = {}) {
    const controller = new ProgressController(metadata, this);
    await controller.run(async progress => {
      dom.assertDone(await this._retryWithProgressIfNotConnected(progress, selector, options.strict, handle => handle._focus(progress)));
    }, this._page._timeoutSettings.timeout(options));
  }

  async blur(metadata: CallMetadata, selector: string, options: types.TimeoutOptions & types.StrictOptions = {}) {
    const controller = new ProgressController(metadata, this);
    await controller.run(async progress => {
      dom.assertDone(await this._retryWithProgressIfNotConnected(progress, selector, options.strict, handle => handle._blur(progress)));
    }, this._page._timeoutSettings.timeout(options));
  }

  async textContent(metadata: CallMetadata, selector: string, options: types.QueryOnSelectorOptions = {}): Promise<string | null> {
    return this._callOnElementOnceMatches(metadata, selector, (injected, element) => element.textContent, undefined, options);
  }

  async innerText(metadata: CallMetadata, selector: string, options: types.QueryOnSelectorOptions = {}): Promise<string> {
    return this._callOnElementOnceMatches(metadata, selector, (injectedScript, element) => {
      if (element.namespaceURI !== 'http://www.w3.org/1999/xhtml')
        throw injectedScript.createStacklessError('Node is not an HTMLElement');
      return (element as HTMLElement).innerText;
    }, undefined, options);
  }

  async innerHTML(metadata: CallMetadata, selector: string, options: types.QueryOnSelectorOptions = {}): Promise<string> {
    return this._callOnElementOnceMatches(metadata, selector, (injected, element) => element.innerHTML, undefined, options);
  }

  async getAttribute(metadata: CallMetadata, selector: string, name: string, options: types.QueryOnSelectorOptions = {}): Promise<string | null> {
    return this._callOnElementOnceMatches(metadata, selector, (injected, element, data) => element.getAttribute(data.name), { name }, options);
  }

  async inputValue(metadata: CallMetadata, selector: string, options: types.TimeoutOptions & types.StrictOptions = {}): Promise<string> {
    return this._callOnElementOnceMatches(metadata, selector, (injectedScript, node) => {
      const element = injectedScript.retarget(node, 'follow-label');
      if (!element || (element.nodeName !== 'INPUT' && element.nodeName !== 'TEXTAREA' && element.nodeName !== 'SELECT'))
        throw injectedScript.createStacklessError('Node is not an <input>, <textarea> or <select> element');
      return (element as any).value;
    }, undefined, options);
  }

  async highlight(selector: string) {
    const resolved = await this.selectors.resolveInjectedForSelector(selector);
    if (!resolved)
      return;
    return await resolved.injected.evaluate((injected, { info }) => {
      return injected.highlight(info.parsed);
    }, { info: resolved.info });
  }

  async hideHighlight() {
    return this.raceAgainstEvaluationStallingEvents(async () => {
      const context = await this._utilityContext();
      const injectedScript = await context.injectedScript();
      return await injectedScript.evaluate(injected => {
        return injected.hideHighlight();
      });
    });
  }

  private async _elementState(metadata: CallMetadata, selector: string, state: ElementStateWithoutStable, options: types.QueryOnSelectorOptions = {}): Promise<boolean> {
    const result = await this._callOnElementOnceMatches(metadata, selector, (injected, element, data) => {
      return injected.elementState(element, data.state);
    }, { state }, options);
    return dom.throwRetargetableDOMError(result);
  }

  async isVisible(metadata: CallMetadata, selector: string, options: types.StrictOptions = {}): Promise<boolean> {
    const controller = new ProgressController(metadata, this);
    return controller.run(async progress => {
      progress.log(`  checking visibility of ${this._asLocator(selector)}`);
      const resolved = await this.selectors.resolveInjectedForSelector(selector, options);
      if (!resolved)
        return false;
      return await resolved.injected.evaluate((injected, { info }) => {
        const element = injected.querySelector(info.parsed, document, info.strict);
        const state = element ? injected.elementState(element, 'visible') : false;
        return state === 'error:notconnected' ? false : state;
      }, { info: resolved.info });
    }, this._page._timeoutSettings.timeout({}));
  }

  async isHidden(metadata: CallMetadata, selector: string, options: types.StrictOptions = {}): Promise<boolean> {
    return !(await this.isVisible(metadata, selector, options));
  }

  async isDisabled(metadata: CallMetadata, selector: string, options: types.QueryOnSelectorOptions = {}): Promise<boolean> {
    return this._elementState(metadata, selector, 'disabled', options);
  }

  async isEnabled(metadata: CallMetadata, selector: string, options: types.QueryOnSelectorOptions = {}): Promise<boolean> {
    return this._elementState(metadata, selector, 'enabled', options);
  }

  async isEditable(metadata: CallMetadata, selector: string, options: types.QueryOnSelectorOptions = {}): Promise<boolean> {
    return this._elementState(metadata, selector, 'editable', options);
  }

  async isChecked(metadata: CallMetadata, selector: string, options: types.QueryOnSelectorOptions = {}): Promise<boolean> {
    return this._elementState(metadata, selector, 'checked', options);
  }

  async hover(metadata: CallMetadata, selector: string, options: types.PointerActionOptions & types.PointerActionWaitOptions & types.NavigatingActionWaitOptions = {}) {
    const controller = new ProgressController(metadata, this);
    return controller.run(async progress => {
      return dom.assertDone(await this._retryWithProgressIfNotConnected(progress, selector, options.strict, handle => handle._hover(progress, options)));
    }, this._page._timeoutSettings.timeout(options));
  }

  async selectOption(metadata: CallMetadata, selector: string, elements: dom.ElementHandle[], values: types.SelectOption[], options: types.NavigatingActionWaitOptions & types.ForceOptions = {}): Promise<string[]> {
    const controller = new ProgressController(metadata, this);
    return controller.run(async progress => {
      return await this._retryWithProgressIfNotConnected(progress, selector, options.strict, handle => handle._selectOption(progress, elements, values, options));
    }, this._page._timeoutSettings.timeout(options));
  }

  async setInputFiles(metadata: CallMetadata, selector: string, items: InputFilesItems, options: types.NavigatingActionWaitOptions = {}): Promise<channels.FrameSetInputFilesResult> {
    const controller = new ProgressController(metadata, this);
    return controller.run(async progress => {
      return dom.assertDone(await this._retryWithProgressIfNotConnected(progress, selector, options.strict, handle => handle._setInputFiles(progress, items, options)));
    }, this._page._timeoutSettings.timeout(options));
  }

  async type(metadata: CallMetadata, selector: string, text: string, options: { delay?: number } & types.NavigatingActionWaitOptions = {}) {
    const controller = new ProgressController(metadata, this);
    return controller.run(async progress => {
      return dom.assertDone(await this._retryWithProgressIfNotConnected(progress, selector, options.strict, handle => handle._type(progress, text, options)));
    }, this._page._timeoutSettings.timeout(options));
  }

  async press(metadata: CallMetadata, selector: string, key: string, options: { delay?: number } & types.NavigatingActionWaitOptions = {}) {
    const controller = new ProgressController(metadata, this);
    return controller.run(async progress => {
      return dom.assertDone(await this._retryWithProgressIfNotConnected(progress, selector, options.strict, handle => handle._press(progress, key, options)));
    }, this._page._timeoutSettings.timeout(options));
  }

  async check(metadata: CallMetadata, selector: string, options: types.PointerActionWaitOptions & types.NavigatingActionWaitOptions = {}) {
    const controller = new ProgressController(metadata, this);
    return controller.run(async progress => {
      return dom.assertDone(await this._retryWithProgressIfNotConnected(progress, selector, options.strict, handle => handle._setChecked(progress, true, options)));
    }, this._page._timeoutSettings.timeout(options));
  }

  async uncheck(metadata: CallMetadata, selector: string, options: types.PointerActionWaitOptions & types.NavigatingActionWaitOptions = {}) {
    const controller = new ProgressController(metadata, this);
    return controller.run(async progress => {
      return dom.assertDone(await this._retryWithProgressIfNotConnected(progress, selector, options.strict, handle => handle._setChecked(progress, false, options)));
    }, this._page._timeoutSettings.timeout(options));
  }

  async waitForTimeout(metadata: CallMetadata, timeout: number) {
    const controller = new ProgressController(metadata, this);
    return controller.run(async () => {
      await new Promise(resolve => setTimeout(resolve, timeout));
    });
  }

  async expect(metadata: CallMetadata, selector: string, options: FrameExpectParams): Promise<{ matches: boolean, received?: any, log?: string[], timedOut?: boolean }> {
    let timeout = this._page._timeoutSettings.timeout(options);
    const start = timeout > 0 ? monotonicTime() : 0;
    const lastIntermediateResult: { received?: any, isSet: boolean } = { isSet: false };
    const resultOneShot = await this._expectInternal(metadata, selector, options, true, timeout, lastIntermediateResult);
    if (resultOneShot.matches !== options.isNot)
      return resultOneShot;
    if (timeout > 0) {
      const elapsed = monotonicTime() - start;
      timeout -= elapsed;
    }
    if (timeout < 0)
      return { matches: options.isNot, log: metadata.log, timedOut: true, received: lastIntermediateResult.received };
    return await this._expectInternal(metadata, selector, options, false, timeout, lastIntermediateResult);
  }

  private async _expectInternal(metadata: CallMetadata, selector: string, options: FrameExpectParams, oneShot: boolean, timeout: number, lastIntermediateResult: { received?: any, isSet: boolean }): Promise<{ matches: boolean, received?: any, log?: string[], timedOut?: boolean }> {
    const controller = new ProgressController(metadata, this);
    return controller.run(async progress => {
      if (oneShot)
        progress.log(`${metadata.apiName}${timeout ? ` with timeout ${timeout}ms` : ''}`);
      progress.log(`waiting for ${this._asLocator(selector)}`);
      return await this.retryWithProgressAndTimeouts(progress, [100, 250, 500, 1000], async continuePolling => {
        const selectorInFrame = await this.selectors.resolveFrameForSelector(selector, { strict: true });
        progress.throwIfAborted();

        const { frame, info } = selectorInFrame || { frame: this, info: undefined };
        const world = options.expression === 'to.have.property' ? 'main' : (info?.world ?? 'utility');
        const context = await frame._context(world);
        const injected = await context.injectedScript();
        progress.throwIfAborted();

        const { log, matches, received, missingRecevied } = await injected.evaluate(async (injected, { info, options, snapshotName }) => {
          const elements = info ? injected.querySelectorAll(info.parsed, document) : [];
          const isArray = options.expression === 'to.have.count' || options.expression.endsWith('.array');
          let log = '';
          if (isArray)
            log = `  locator resolved to ${elements.length} element${elements.length === 1 ? '' : 's'}`;
          else if (elements.length > 1)
            throw injected.strictModeViolationError(info!.parsed, elements);
          else if (elements.length)
            log = `  locator resolved to ${injected.previewNode(elements[0])}`;
          if (snapshotName)
            injected.markTargetElements(new Set(elements), snapshotName);
          return { log, ...(await injected.expect(elements[0], options, elements)) };
        }, { info, options, snapshotName: progress.metadata.afterSnapshot });

        if (log)
          progress.log(log);
        // Note: missingReceived avoids `unexpected value "undefined"` when element was not found.
        if (matches === options.isNot && !missingRecevied) {
          lastIntermediateResult.received = received;
          lastIntermediateResult.isSet = true;
          if (!Array.isArray(received))
            progress.log(`  unexpected value "${renderUnexpectedValue(options.expression, received)}"`);
        }
        if (!oneShot && matches === options.isNot) {
          // Keep waiting in these cases:
          // expect(locator).conditionThatDoesNotMatch
          // expect(locator).not.conditionThatDoesMatch
          return continuePolling;
        }
        return { matches, received };
      });
    }, oneShot ? 0 : timeout).catch(e => {
      // Q: Why not throw upon isSessionClosedError(e) as in other places?
      // A: We want user to receive a friendly message containing the last intermediate result.
      if (js.isJavaScriptErrorInEvaluate(e) || isInvalidSelectorError(e))
        throw e;
      const result: { matches: boolean, received?: any, log?: string[], timedOut?: boolean } = { matches: options.isNot, log: metadata.log };
      if (lastIntermediateResult.isSet)
        result.received = lastIntermediateResult.received;
      else
        result.timedOut = true;
      return result;
    });
  }

  async _waitForFunctionExpression<R>(metadata: CallMetadata, expression: string, isFunction: boolean | undefined, arg: any, options: types.WaitForFunctionOptions, world: types.World = 'main'): Promise<js.SmartHandle<R>> {
    const controller = new ProgressController(metadata, this);
    if (typeof options.pollingInterval === 'number')
      assert(options.pollingInterval > 0, 'Cannot poll with non-positive interval: ' + options.pollingInterval);
    expression = js.normalizeEvaluationExpression(expression, isFunction);
    return controller.run(async progress => {
      return this.retryWithProgressAndTimeouts(progress, [100], async () => {
        const context = world === 'main' ? await this._mainContext() : await this._utilityContext();
        const injectedScript = await context.injectedScript();
        const handle = await injectedScript.evaluateHandle((injected, { expression, isFunction, polling, arg }) => {
          const predicate = (): R => {
            // NOTE: make sure to use `globalThis.eval` instead of `self.eval` due to a bug with sandbox isolation
            // in firefox.
            // See https://bugzilla.mozilla.org/show_bug.cgi?id=1814898
            let result = globalThis.eval(expression);
            if (isFunction === true) {
              result = result(arg);
            } else if (isFunction === false) {
              result = result;
            } else {
              // auto detect.
              if (typeof result === 'function')
                result = result(arg);
            }
            return result;
          };

          let fulfill: (result: R) => void;
          let reject: (error: Error) => void;
          let aborted = false;
          const result = new Promise<R>((f, r) => { fulfill = f; reject = r; });

          const next = () => {
            if (aborted)
              return;
            try {
              const success = predicate();
              if (success) {
                fulfill(success);
                return;
              }
              if (typeof polling !== 'number')
                requestAnimationFrame(next);
              else
                setTimeout(next, polling);
            } catch (e) {
              reject(e);
            }
          };

          next();
          return { result, abort: () => aborted = true };
        }, { expression, isFunction, polling: options.pollingInterval, arg });
        progress.cleanupWhenAborted(() => handle.evaluate(h => h.abort()).catch(() => {}));
        return handle.evaluateHandle(h => h.result);
      });
    }, this._page._timeoutSettings.timeout(options));
  }

  async waitForFunctionValueInUtility<R>(progress: Progress, pageFunction: js.Func1<any, R>) {
    const expression = `() => {
      const result = (${pageFunction})();
      if (!result)
        return result;
      return JSON.stringify(result);
    }`;
    const handle = await this._waitForFunctionExpression(serverSideCallMetadata(), expression, true, undefined, { timeout: progress.timeUntilDeadline() }, 'utility');
    return JSON.parse(handle.rawValue()) as R;
  }

  async title(): Promise<string> {
    const context = await this._utilityContext();
    return context.evaluate(() => document.title);
  }

  async rafrafTimeout(timeout: number): Promise<void> {
    if (timeout === 0)
      return;
    const context = await this._utilityContext();
    await Promise.all([
      // wait for double raf
      context.evaluate(() => new Promise(x => {
        requestAnimationFrame(() => {
          requestAnimationFrame(x);
        });
      })),
      new Promise(fulfill => setTimeout(fulfill, timeout)),
    ]);
  }

  _onDetached() {
    this._stopNetworkIdleTimer();
    this._detached = true;
    this._detachedCallback();
    const error = new Error('Frame was detached');
    for (const data of this._contextData.values()) {
      if (data.context)
        data.context.contextDestroyed(error);
      data.contextPromise.resolve(error);
    }
    if (this._parentFrame)
      this._parentFrame._childFrames.delete(this);
    this._parentFrame = null;
  }

  private async _callOnElementOnceMatches<T, R>(metadata: CallMetadata, selector: string, body: ElementCallback<T, R>, taskData: T, options: types.TimeoutOptions & types.StrictOptions & { mainWorld?: boolean } = {}): Promise<R> {
    const callbackText = body.toString();
    const controller = new ProgressController(metadata, this);
    return controller.run(async progress => {
      progress.log(`waiting for ${this._asLocator(selector)}`);
      return this.retryWithProgressAndTimeouts(progress, [0, 20, 50, 100, 100, 500], async continuePolling => {
        const resolved = await this.selectors.resolveInjectedForSelector(selector, options);
        progress.throwIfAborted();
        if (!resolved)
          return continuePolling;
        const { log, success, value } = await resolved.injected.evaluate((injected, { info, callbackText, taskData, snapshotName }) => {
          const callback = injected.eval(callbackText) as ElementCallback<T, R>;
          const element = injected.querySelector(info.parsed, document, info.strict);
          if (!element)
            return { success: false };
          const log = `  locator resolved to ${injected.previewNode(element)}`;
          if (snapshotName)
            injected.markTargetElements(new Set([element]), snapshotName);
          return { log, success: true, value: callback(injected, element, taskData as T) };
        }, { info: resolved.info, callbackText, taskData, snapshotName: progress.metadata.afterSnapshot });

        if (log)
          progress.log(log);
        if (!success)
          return continuePolling;
        return value!;
      });
    }, this._page._timeoutSettings.timeout(options));
  }

  private _setContext(world: types.World, context: dom.FrameExecutionContext | null) {
    const data = this._contextData.get(world)!;
    data.context = context;
    if (context)
      data.contextPromise.resolve(context);
    else
      data.contextPromise = new ManualPromise();
  }

  _contextCreated(world: types.World, context: dom.FrameExecutionContext) {
    const data = this._contextData.get(world)!;
    // In case of multiple sessions to the same target, there's a race between
    // connections so we might end up creating multiple isolated worlds.
    // We can use either.
    if (data.context) {
      data.context.contextDestroyed(new Error('Execution context was destroyed, most likely because of a navigation'));
      this._setContext(world, null);
    }
    this._setContext(world, context);
  }

  _contextDestroyed(context: dom.FrameExecutionContext) {
    // Sometimes we get this after detach, in which case we should not reset
    // our already destroyed contexts to something that will never resolve.
    if (this._detached)
      return;
    context.contextDestroyed(new Error('Execution context was destroyed, most likely because of a navigation'));
    for (const [world, data] of this._contextData) {
      if (data.context === context)
        this._setContext(world, null);
    }
  }

  _startNetworkIdleTimer() {
    assert(!this._networkIdleTimer);
    // We should not start a timer and report networkidle in detached frames.
    // This happens at least in Firefox for child frames, where we may get requestFinished
    // after the frame was detached - probably a race in the Firefox itself.
    if (this._firedLifecycleEvents.has('networkidle') || this._detached)
      return;
    this._networkIdleTimer = setTimeout(() => {
      this._firedNetworkIdleSelf = true;
      this._page.mainFrame()._recalculateNetworkIdle();
    }, 500);
  }

  _stopNetworkIdleTimer() {
    if (this._networkIdleTimer)
      clearTimeout(this._networkIdleTimer);
    this._networkIdleTimer = undefined;
    this._firedNetworkIdleSelf = false;
  }

  async extendInjectedScript(source: string, arg?: any): Promise<js.JSHandle> {
    const context = await this._context('main');
    const injectedScriptHandle = await context.injectedScript();
    return injectedScriptHandle.evaluateHandle((injectedScript, { source, arg }) => {
      return injectedScript.extend(source, arg);
    }, { source, arg });
  }

  async resetStorageForCurrentOriginBestEffort(newStorage: channels.OriginStorage | undefined) {
    const context = await this._utilityContext();
    await context.evaluate(async ({ ls }) => {
      // Clean DOMStorage.
      sessionStorage.clear();
      localStorage.clear();

      // Add new DOM Storage values.
      for (const entry of ls || [])
        localStorage[entry.name] = entry.value;

      // Clean Service Workers
      const registrations = navigator.serviceWorker ? await navigator.serviceWorker.getRegistrations() : [];
      await Promise.all(registrations.map(async r => {
        // Heuristic for service workers that stalled during main script fetch or importScripts:
        // Waiting for them to finish unregistering takes ages so we do not await.
        // However, they will unregister immediately after fetch finishes and should not affect next page load.
        // Unfortunately, loading next page in Chromium still takes 5 seconds waiting for
        // some operation on this bogus service worker to finish.
        if (!r.installing && !r.waiting && !r.active)
          r.unregister().catch(() => {});
        else
          await r.unregister().catch(() => {});
      }));

      // Clean IndexedDB
      for (const db of await indexedDB.databases?.() || []) {
        // Do not wait for the callback - it is called on timer in Chromium (slow).
        if (db.name)
          indexedDB.deleteDatabase(db.name!);
      }
    }, { ls: newStorage?.localStorage }).catch(() => {});
  }

  private _asLocator(selector: string) {
    return asLocator(this._page.context()._browser.options.sdkLanguage, selector);
  }
}

class SignalBarrier {
  private _progress: Progress | null;
  private _protectCount = 0;
  private _promise = new ManualPromise<void>();

  constructor(progress: Progress | null) {
    this._progress = progress;
    this.retain();
  }

  waitFor(): PromiseLike<void> {
    this.release();
    return this._promise;
  }

  async addFrameNavigation(frame: Frame) {
    // Auto-wait top-level navigations only.
    if (frame.parentFrame())
      return;
    this.retain();
    const waiter = helper.waitForEvent(null, frame, Frame.Events.InternalNavigation, (e: NavigationEvent) => {
      if (!e.isPublic)
        return false;
      if (!e.error && this._progress)
        this._progress.log(`  navigated to "${frame._url}"`);
      return true;
    });
    await Promise.race([
      frame._page._disconnectedPromise,
      frame._page._crashedPromise,
      frame._detachedPromise,
      waiter.promise,
    ]).catch(e => {});
    waiter.dispose();
    this.release();
  }

  retain() {
    ++this._protectCount;
  }

  release() {
    --this._protectCount;
    if (!this._protectCount)
      this._promise.resolve();
  }
}

function verifyLifecycle(name: string, waitUntil: types.LifecycleEvent): types.LifecycleEvent {
  if (waitUntil as unknown === 'networkidle0')
    waitUntil = 'networkidle';
  if (!types.kLifecycleEvents.has(waitUntil))
    throw new Error(`${name}: expected one of (load|domcontentloaded|networkidle|commit)`);
  return waitUntil;
}

function renderUnexpectedValue(expression: string, received: any): string {
  if (expression === 'to.be.checked')
    return received ? 'checked' : 'unchecked';
  if (expression === 'to.be.unchecked')
    return received ? 'unchecked' : 'checked';
  if (expression === 'to.be.visible')
    return received ? 'visible' : 'hidden';
  if (expression === 'to.be.hidden')
    return received ? 'hidden' : 'visible';
  if (expression === 'to.be.enabled')
    return received ? 'enabled' : 'disabled';
  if (expression === 'to.be.disabled')
    return received ? 'disabled' : 'enabled';
  if (expression === 'to.be.editable')
    return received ? 'editable' : 'readonly';
  if (expression === 'to.be.readonly')
    return received ? 'readonly' : 'editable';
  if (expression === 'to.be.empty')
    return received ? 'empty' : 'not empty';
  if (expression === 'to.be.focused')
    return received ? 'focused' : 'not focused';
  return received;
}
