/**
 * Copyright 2017 Google Inc. All rights reserved.
 *
 * 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 { EventEmitter } from './EventEmitter.js';
import { assert } from './assert.js';
import { helper, debugError } from './helper.js';
import { ExecutionContext, EVALUATION_SCRIPT_URL } from './ExecutionContext.js';
import {
  LifecycleWatcher,
  PuppeteerLifeCycleEvent,
} from './LifecycleWatcher.js';
import { DOMWorld, WaitForSelectorOptions } from './DOMWorld.js';
import { NetworkManager } from './NetworkManager.js';
import { TimeoutSettings } from './TimeoutSettings.js';
import { CDPSession } from './Connection.js';
import { JSHandle, ElementHandle } from './JSHandle.js';
import { MouseButton } from './Input.js';
import { Page } from './Page.js';
import { HTTPResponse } from './HTTPResponse.js';
import { Protocol } from 'devtools-protocol';
import {
  SerializableOrJSHandle,
  EvaluateHandleFn,
  WrapElementHandle,
  EvaluateFn,
  EvaluateFnReturnType,
  UnwrapPromiseLike,
} from './EvalTypes.js';

const UTILITY_WORLD_NAME = '__puppeteer_utility_world__';

/**
 * We use symbols to prevent external parties listening to these events.
 * They are internal to Puppeteer.
 *
 * @internal
 */
export const FrameManagerEmittedEvents = {
  FrameAttached: Symbol('FrameManager.FrameAttached'),
  FrameNavigated: Symbol('FrameManager.FrameNavigated'),
  FrameDetached: Symbol('FrameManager.FrameDetached'),
  LifecycleEvent: Symbol('FrameManager.LifecycleEvent'),
  FrameNavigatedWithinDocument: Symbol(
    'FrameManager.FrameNavigatedWithinDocument'
  ),
  ExecutionContextCreated: Symbol('FrameManager.ExecutionContextCreated'),
  ExecutionContextDestroyed: Symbol('FrameManager.ExecutionContextDestroyed'),
};

/**
 * @internal
 */
export class FrameManager extends EventEmitter {
  _client: CDPSession;
  private _page: Page;
  private _networkManager: NetworkManager;
  _timeoutSettings: TimeoutSettings;
  private _frames = new Map<string, Frame>();
  private _contextIdToContext = new Map<number, ExecutionContext>();
  private _isolatedWorlds = new Set<string>();
  private _mainFrame: Frame;

  constructor(
    client: CDPSession,
    page: Page,
    ignoreHTTPSErrors: boolean,
    timeoutSettings: TimeoutSettings
  ) {
    super();
    this._client = client;
    this._page = page;
    this._networkManager = new NetworkManager(client, ignoreHTTPSErrors, this);
    this._timeoutSettings = timeoutSettings;
    this._client.on('Page.frameAttached', (event) =>
      this._onFrameAttached(event.frameId, event.parentFrameId)
    );
    this._client.on('Page.frameNavigated', (event) =>
      this._onFrameNavigated(event.frame)
    );
    this._client.on('Page.navigatedWithinDocument', (event) =>
      this._onFrameNavigatedWithinDocument(event.frameId, event.url)
    );
    this._client.on('Page.frameDetached', (event) =>
      this._onFrameDetached(event.frameId)
    );
    this._client.on('Page.frameStoppedLoading', (event) =>
      this._onFrameStoppedLoading(event.frameId)
    );
    this._client.on('Runtime.executionContextCreated', (event) =>
      this._onExecutionContextCreated(event.context)
    );
    this._client.on('Runtime.executionContextDestroyed', (event) =>
      this._onExecutionContextDestroyed(event.executionContextId)
    );
    this._client.on('Runtime.executionContextsCleared', () =>
      this._onExecutionContextsCleared()
    );
    this._client.on('Page.lifecycleEvent', (event) =>
      this._onLifecycleEvent(event)
    );
  }

  async initialize(): Promise<void> {
    const result = await Promise.all<{}, Protocol.Page.GetFrameTreeResponse>([
      this._client.send('Page.enable'),
      this._client.send('Page.getFrameTree'),
    ]);

    const { frameTree } = result[1];
    this._handleFrameTree(frameTree);
    await Promise.all([
      this._client.send('Page.setLifecycleEventsEnabled', { enabled: true }),
      this._client
        .send('Runtime.enable')
        .then(() => this._ensureIsolatedWorld(UTILITY_WORLD_NAME)),
      this._networkManager.initialize(),
    ]);
  }

  networkManager(): NetworkManager {
    return this._networkManager;
  }

  async navigateFrame(
    frame: Frame,
    url: string,
    options: {
      referer?: string;
      timeout?: number;
      waitUntil?: PuppeteerLifeCycleEvent | PuppeteerLifeCycleEvent[];
    } = {}
  ): Promise<HTTPResponse | null> {
    assertNoLegacyNavigationOptions(options);
    const {
      referer = this._networkManager.extraHTTPHeaders()['referer'],
      waitUntil = ['load'],
      timeout = this._timeoutSettings.navigationTimeout(),
    } = options;

    const watcher = new LifecycleWatcher(this, frame, waitUntil, timeout);
    let ensureNewDocumentNavigation = false;
    let error = await Promise.race([
      navigate(this._client, url, referer, frame._id),
      watcher.timeoutOrTerminationPromise(),
    ]);
    if (!error) {
      error = await Promise.race([
        watcher.timeoutOrTerminationPromise(),
        ensureNewDocumentNavigation
          ? watcher.newDocumentNavigationPromise()
          : watcher.sameDocumentNavigationPromise(),
      ]);
    }
    watcher.dispose();
    if (error) throw error;
    return watcher.navigationResponse();

    async function navigate(
      client: CDPSession,
      url: string,
      referrer: string,
      frameId: string
    ): Promise<Error | null> {
      try {
        const response = await client.send('Page.navigate', {
          url,
          referrer,
          frameId,
        });
        ensureNewDocumentNavigation = !!response.loaderId;
        return response.errorText
          ? new Error(`${response.errorText} at ${url}`)
          : null;
      } catch (error) {
        return error;
      }
    }
  }

  async waitForFrameNavigation(
    frame: Frame,
    options: {
      timeout?: number;
      waitUntil?: PuppeteerLifeCycleEvent | PuppeteerLifeCycleEvent[];
    } = {}
  ): Promise<HTTPResponse | null> {
    assertNoLegacyNavigationOptions(options);
    const {
      waitUntil = ['load'],
      timeout = this._timeoutSettings.navigationTimeout(),
    } = options;
    const watcher = new LifecycleWatcher(this, frame, waitUntil, timeout);
    const error = await Promise.race([
      watcher.timeoutOrTerminationPromise(),
      watcher.sameDocumentNavigationPromise(),
      watcher.newDocumentNavigationPromise(),
    ]);
    watcher.dispose();
    if (error) throw error;
    return watcher.navigationResponse();
  }

  _onLifecycleEvent(event: Protocol.Page.LifecycleEventEvent): void {
    const frame = this._frames.get(event.frameId);
    if (!frame) return;
    frame._onLifecycleEvent(event.loaderId, event.name);
    this.emit(FrameManagerEmittedEvents.LifecycleEvent, frame);
  }

  _onFrameStoppedLoading(frameId: string): void {
    const frame = this._frames.get(frameId);
    if (!frame) return;
    frame._onLoadingStopped();
    this.emit(FrameManagerEmittedEvents.LifecycleEvent, frame);
  }

  _handleFrameTree(frameTree: Protocol.Page.FrameTree): void {
    if (frameTree.frame.parentId)
      this._onFrameAttached(frameTree.frame.id, frameTree.frame.parentId);
    this._onFrameNavigated(frameTree.frame);
    if (!frameTree.childFrames) return;

    for (const child of frameTree.childFrames) this._handleFrameTree(child);
  }

  page(): Page {
    return this._page;
  }

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

  frames(): Frame[] {
    return Array.from(this._frames.values());
  }

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

  _onFrameAttached(frameId: string, parentFrameId?: string): void {
    if (this._frames.has(frameId)) return;
    assert(parentFrameId);
    const parentFrame = this._frames.get(parentFrameId);
    const frame = new Frame(this, parentFrame, frameId);
    this._frames.set(frame._id, frame);
    this.emit(FrameManagerEmittedEvents.FrameAttached, frame);
  }

  _onFrameNavigated(framePayload: Protocol.Page.Frame): void {
    const isMainFrame = !framePayload.parentId;
    let frame = isMainFrame
      ? this._mainFrame
      : this._frames.get(framePayload.id);
    assert(
      isMainFrame || frame,
      'We either navigate top level or have old version of the navigated frame'
    );

    // Detach all child frames first.
    if (frame) {
      for (const child of frame.childFrames())
        this._removeFramesRecursively(child);
    }

    // Update or create main frame.
    if (isMainFrame) {
      if (frame) {
        // Update frame id to retain frame identity on cross-process navigation.
        this._frames.delete(frame._id);
        frame._id = framePayload.id;
      } else {
        // Initial main frame navigation.
        frame = new Frame(this, null, framePayload.id);
      }
      this._frames.set(framePayload.id, frame);
      this._mainFrame = frame;
    }

    // Update frame payload.
    frame._navigated(framePayload);

    this.emit(FrameManagerEmittedEvents.FrameNavigated, frame);
  }

  async _ensureIsolatedWorld(name: string): Promise<void> {
    if (this._isolatedWorlds.has(name)) return;
    this._isolatedWorlds.add(name);
    await this._client.send('Page.addScriptToEvaluateOnNewDocument', {
      source: `//# sourceURL=${EVALUATION_SCRIPT_URL}`,
      worldName: name,
    }),
      await Promise.all(
        this.frames().map((frame) =>
          this._client
            .send('Page.createIsolatedWorld', {
              frameId: frame._id,
              grantUniveralAccess: true,
              worldName: name,
            })
            .catch(debugError)
        )
      ); // frames might be removed before we send this
  }

  _onFrameNavigatedWithinDocument(frameId: string, url: string): void {
    const frame = this._frames.get(frameId);
    if (!frame) return;
    frame._navigatedWithinDocument(url);
    this.emit(FrameManagerEmittedEvents.FrameNavigatedWithinDocument, frame);
    this.emit(FrameManagerEmittedEvents.FrameNavigated, frame);
  }

  _onFrameDetached(frameId: string): void {
    const frame = this._frames.get(frameId);
    if (frame) this._removeFramesRecursively(frame);
  }

  _onExecutionContextCreated(
    contextPayload: Protocol.Runtime.ExecutionContextDescription
  ): void {
    const auxData = contextPayload.auxData as { frameId?: string };
    const frameId = auxData ? auxData.frameId : null;
    const frame = this._frames.get(frameId) || null;
    let world = null;
    if (frame) {
      if (contextPayload.auxData && !!contextPayload.auxData['isDefault']) {
        world = frame._mainWorld;
      } else if (
        contextPayload.name === UTILITY_WORLD_NAME &&
        !frame._secondaryWorld._hasContext()
      ) {
        // 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.
        world = frame._secondaryWorld;
      }
    }
    if (contextPayload.auxData && contextPayload.auxData['type'] === 'isolated')
      this._isolatedWorlds.add(contextPayload.name);
    const context = new ExecutionContext(this._client, contextPayload, world);
    if (world) world._setContext(context);
    this._contextIdToContext.set(contextPayload.id, context);
  }

  private _onExecutionContextDestroyed(executionContextId: number): void {
    const context = this._contextIdToContext.get(executionContextId);
    if (!context) return;
    this._contextIdToContext.delete(executionContextId);
    if (context._world) context._world._setContext(null);
  }

  private _onExecutionContextsCleared(): void {
    for (const context of this._contextIdToContext.values()) {
      if (context._world) context._world._setContext(null);
    }
    this._contextIdToContext.clear();
  }

  executionContextById(contextId: number): ExecutionContext {
    const context = this._contextIdToContext.get(contextId);
    assert(context, 'INTERNAL ERROR: missing context with id = ' + contextId);
    return context;
  }

  private _removeFramesRecursively(frame: Frame): void {
    for (const child of frame.childFrames())
      this._removeFramesRecursively(child);
    frame._detach();
    this._frames.delete(frame._id);
    this.emit(FrameManagerEmittedEvents.FrameDetached, frame);
  }
}

/**
 * @public
 */
export interface FrameWaitForFunctionOptions {
  /**
   * An interval at which the `pageFunction` is executed, defaults to `raf`. If
   * `polling` is a number, then it is treated as an interval in milliseconds at
   * which the function would be executed. If `polling` is a string, then it can
   * be one of the following values:
   *
   * - `raf` - to constantly execute `pageFunction` in `requestAnimationFrame`
   *   callback. This is the tightest polling mode which is suitable to observe
   *   styling changes.
   *
   * - `mutation` - to execute `pageFunction` on every DOM mutation.
   */
  polling?: string | number;
  /**
   * Maximum time to wait in milliseconds. Defaults to `30000` (30 seconds).
   * Pass `0` to disable the timeout. Puppeteer's default timeout can be changed
   * using {@link Page.setDefaultTimeout}.
   */
  timeout?: number;
}

/**
 * @public
 */
export interface FrameAddScriptTagOptions {
  /**
   * the URL of the script to be added.
   */
  url?: string;
  /**
   * The path to a JavaScript file to be injected into the frame.
   * @remarks
   * If `path` is a relative path, it is resolved relative to the current
   * working directory (`process.cwd()` in Node.js).
   */
  path?: string;
  /**
   * Raw JavaScript content to be injected into the frame.
   */
  content?: string;
  /**
   * Set the script's `type`. Use `module` in order to load an ES2015 module.
   */
  type?: string;
}

/**
 * @public
 */
export interface FrameAddStyleTagOptions {
  /**
   * the URL of the CSS file to be added.
   */
  url?: string;
  /**
   * The path to a CSS file to be injected into the frame.
   * @remarks
   * If `path` is a relative path, it is resolved relative to the current
   * working directory (`process.cwd()` in Node.js).
   */
  path?: string;
  /**
   * Raw CSS content to be injected into the frame.
   */
  content?: string;
}

/**
 * At every point of time, page exposes its current frame tree via the
 * {@link Page.mainFrame | page.mainFrame} and
 * {@link Frame.childFrames | frame.childFrames} methods.
 *
 * @remarks
 *
 * `Frame` object lifecycles are controlled by three events that are all
 * dispatched on the page object:
 *
 * - {@link PageEmittedEvents.FrameAttached}
 *
 * - {@link PageEmittedEvents.FrameNavigated}
 *
 * - {@link PageEmittedEvents.FrameDetached}
 *
 * @Example
 * An example of dumping frame tree:
 *
 * ```js
 * const puppeteer = require('puppeteer');
 *
 * (async () => {
 *   const browser = await puppeteer.launch();
 *   const page = await browser.newPage();
 *   await page.goto('https://www.google.com/chrome/browser/canary.html');
 *   dumpFrameTree(page.mainFrame(), '');
 *   await browser.close();
 *
 *   function dumpFrameTree(frame, indent) {
 *     console.log(indent + frame.url());
 *     for (const child of frame.childFrames()) {
 *     dumpFrameTree(child, indent + '  ');
 *     }
 *   }
 * })();
 * ```
 *
 * @Example
 * An example of getting text from an iframe element:
 *
 * ```js
 * const frame = page.frames().find(frame => frame.name() === 'myframe');
 * const text = await frame.$eval('.selector', element => element.textContent);
 * console.log(text);
 * ```
 *
 * @public
 */
export class Frame {
  /**
   * @internal
   */
  _frameManager: FrameManager;
  private _parentFrame?: Frame;
  /**
   * @internal
   */
  _id: string;

  private _url = '';
  private _detached = false;
  /**
   * @internal
   */
  _loaderId = '';
  /**
   * @internal
   */
  _name?: string;

  /**
   * @internal
   */
  _lifecycleEvents = new Set<string>();
  /**
   * @internal
   */
  _mainWorld: DOMWorld;
  /**
   * @internal
   */
  _secondaryWorld: DOMWorld;
  /**
   * @internal
   */
  _childFrames: Set<Frame>;

  /**
   * @internal
   */
  constructor(
    frameManager: FrameManager,
    parentFrame: Frame | null,
    frameId: string
  ) {
    this._frameManager = frameManager;
    this._parentFrame = parentFrame;
    this._url = '';
    this._id = frameId;
    this._detached = false;

    this._loaderId = '';
    this._mainWorld = new DOMWorld(
      frameManager,
      this,
      frameManager._timeoutSettings
    );
    this._secondaryWorld = new DOMWorld(
      frameManager,
      this,
      frameManager._timeoutSettings
    );

    this._childFrames = new Set();
    if (this._parentFrame) this._parentFrame._childFrames.add(this);
  }

  /**
   * @remarks
   *
   * `frame.goto` will throw an error if:
   * - there's an SSL error (e.g. in case of self-signed certificates).
   *
   * - target URL is invalid.
   *
   * - the `timeout` is exceeded during navigation.
   *
   * - the remote server does not respond or is unreachable.
   *
   * - the main resource failed to load.
   *
   * `frame.goto` will not throw an error when any valid HTTP status code is
   * returned by the remote server, including 404 "Not Found" and 500 "Internal
   * Server Error".  The status code for such responses can be retrieved by
   * calling {@link HTTPResponse.status}.
   *
   * NOTE: `frame.goto` either throws an error or returns a main resource
   * response. The only exceptions are navigation to `about:blank` or
   * navigation to the same URL with a different hash, which would succeed and
   * return `null`.
   *
   * NOTE: Headless mode doesn't support navigation to a PDF document. See
   * the {@link https://bugs.chromium.org/p/chromium/issues/detail?id=761295 | upstream
   * issue}.
   *
   * @param url - the URL to navigate the frame to. This should include the
   * scheme, e.g. `https://`.
   * @param options - navigation options. `waitUntil` is useful to define when
   * the navigation should be considered successful - see the docs for
   * {@link PuppeteerLifeCycleEvent} for more details.
   *
   * @returns A promise which resolves to the main resource response. In case of
   * multiple redirects, the navigation will resolve with the response of the
   * last redirect.
   */
  async goto(
    url: string,
    options: {
      referer?: string;
      timeout?: number;
      waitUntil?: PuppeteerLifeCycleEvent | PuppeteerLifeCycleEvent[];
    } = {}
  ): Promise<HTTPResponse | null> {
    return await this._frameManager.navigateFrame(this, url, options);
  }

  /**
   * @remarks
   *
   * This resolves when the frame navigates to a new URL. It is useful for when
   * you run code which will indirectly cause the frame to navigate. Consider
   * this example:
   *
   * ```js
   * const [response] = await Promise.all([
   *   // The navigation promise resolves after navigation has finished
   *   frame.waitForNavigation(),
   *   // Clicking the link will indirectly cause a navigation
   *   frame.click('a.my-link'),
   * ]);
   * ```
   *
   * Usage of the {@link https://developer.mozilla.org/en-US/docs/Web/API/History_API | History API} to change the URL is considered a navigation.
   *
   * @param options - options to configure when the navigation is consided finished.
   * @returns a promise that resolves when the frame navigates to a new URL.
   */
  async waitForNavigation(
    options: {
      timeout?: number;
      waitUntil?: PuppeteerLifeCycleEvent | PuppeteerLifeCycleEvent[];
    } = {}
  ): Promise<HTTPResponse | null> {
    return await this._frameManager.waitForFrameNavigation(this, options);
  }

  /**
   * @returns a promise that resolves to the frame's default execution context.
   */
  executionContext(): Promise<ExecutionContext> {
    return this._mainWorld.executionContext();
  }

  /**
   * @remarks
   *
   * The only difference between {@link Frame.evaluate} and
   * `frame.evaluateHandle` is that `evaluateHandle` will return the value
   * wrapped in an in-page object.
   *
   * This method behaves identically to {@link Page.evaluateHandle} except it's
   * run within the context of the `frame`, rather than the entire page.
   *
   * @param pageFunction - a function that is run within the frame
   * @param args - arguments to be passed to the pageFunction
   */
  async evaluateHandle<HandlerType extends JSHandle = JSHandle>(
    pageFunction: EvaluateHandleFn,
    ...args: SerializableOrJSHandle[]
  ): Promise<HandlerType> {
    return this._mainWorld.evaluateHandle<HandlerType>(pageFunction, ...args);
  }

  /**
   * @remarks
   *
   * This method behaves identically to {@link Page.evaluate} except it's run
   * within the context of the `frame`, rather than the entire page.
   *
   * @param pageFunction - a function that is run within the frame
   * @param args - arguments to be passed to the pageFunction
   */
  async evaluate<T extends EvaluateFn>(
    pageFunction: T,
    ...args: SerializableOrJSHandle[]
  ): Promise<UnwrapPromiseLike<EvaluateFnReturnType<T>>> {
    return this._mainWorld.evaluate<T>(pageFunction, ...args);
  }

  /**
   * This method queries the frame for the given selector.
   *
   * @param selector - a selector to query for.
   * @returns A promise which resolves to an `ElementHandle` pointing at the
   * element, or `null` if it was not found.
   */
  async $(selector: string): Promise<ElementHandle | null> {
    return this._mainWorld.$(selector);
  }

  /**
   * This method evaluates the given XPath expression and returns the results.
   *
   * @param expression - the XPath expression to evaluate.
   */
  async $x(expression: string): Promise<ElementHandle[]> {
    return this._mainWorld.$x(expression);
  }

  /**
   * @remarks
   *
   * This method runs `document.querySelector` within
   * the frame and passes it as the first argument to `pageFunction`.
   *
   * If `pageFunction` returns a Promise, then `frame.$eval` would wait for
   * the promise to resolve and return its value.
   *
   * @example
   *
   * ```js
   * const searchValue = await frame.$eval('#search', el => el.value);
   * ```
   *
   * @param selector - the selector to query for
   * @param pageFunction - the function to be evaluated in the frame's context
   * @param args - additional arguments to pass to `pageFuncton`
   */
  async $eval<ReturnType>(
    selector: string,
    pageFunction: (
      element: Element,
      ...args: unknown[]
    ) => ReturnType | Promise<ReturnType>,
    ...args: SerializableOrJSHandle[]
  ): Promise<WrapElementHandle<ReturnType>> {
    return this._mainWorld.$eval<ReturnType>(selector, pageFunction, ...args);
  }

  /**
   * @remarks
   *
   * This method runs `Array.from(document.querySelectorAll(selector))` within
   * the frame and passes it as the first argument to `pageFunction`.
   *
   * If `pageFunction` returns a Promise, then `frame.$$eval` would wait for
   * the promise to resolve and return its value.
   *
   * @example
   *
   * ```js
   * const divsCounts = await frame.$$eval('div', divs => divs.length);
   * ```
   *
   * @param selector - the selector to query for
   * @param pageFunction - the function to be evaluated in the frame's context
   * @param args - additional arguments to pass to `pageFuncton`
   */
  async $$eval<ReturnType>(
    selector: string,
    pageFunction: (
      elements: Element[],
      ...args: unknown[]
    ) => ReturnType | Promise<ReturnType>,
    ...args: SerializableOrJSHandle[]
  ): Promise<WrapElementHandle<ReturnType>> {
    return this._mainWorld.$$eval<ReturnType>(selector, pageFunction, ...args);
  }

  /**
   * This runs `document.querySelectorAll` in the frame and returns the result.
   *
   * @param selector - a selector to search for
   * @returns An array of element handles pointing to the found frame elements.
   */
  async $$(selector: string): Promise<ElementHandle[]> {
    return this._mainWorld.$$(selector);
  }

  /**
   * @returns the full HTML contents of the frame, including the doctype.
   */
  async content(): Promise<string> {
    return this._secondaryWorld.content();
  }

  /**
   * Set the content of the frame.
   *
   * @param html - HTML markup to assign to the page.
   * @param options - options to configure how long before timing out and at
   * what point to consider the content setting successful.
   */
  async setContent(
    html: string,
    options: {
      timeout?: number;
      waitUntil?: PuppeteerLifeCycleEvent | PuppeteerLifeCycleEvent[];
    } = {}
  ): Promise<void> {
    return this._secondaryWorld.setContent(html, options);
  }

  /**
   * @remarks
   *
   * If the name is empty, it returns the `id` attribute instead.
   *
   * Note: This value is calculated once when the frame is created, and will not
   * update if the attribute is changed later.
   *
   * @returns the frame's `name` attribute as specified in the tag.
   */
  name(): string {
    return this._name || '';
  }

  /**
   * @returns the frame's URL.
   */
  url(): string {
    return this._url;
  }

  /**
   * @returns the parent `Frame`, if any. Detached and main frames return `null`.
   */
  parentFrame(): Frame | null {
    return this._parentFrame;
  }

  /**
   * @returns an array of child frames.
   */
  childFrames(): Frame[] {
    return Array.from(this._childFrames);
  }

  /**
   * @returns `true` if the frame has been detached, or `false` otherwise.
   */
  isDetached(): boolean {
    return this._detached;
  }

  /**
   * Adds a `<script>` tag into the page with the desired url or content.
   *
   * @param options - configure the script to add to the page.
   *
   * @returns a promise that resolves to the added tag when the script's
   * `onload` event fires or when the script content was injected into the
   * frame.
   */
  async addScriptTag(
    options: FrameAddScriptTagOptions
  ): Promise<ElementHandle> {
    return this._mainWorld.addScriptTag(options);
  }

  /**
   * Adds a `<link rel="stylesheet">` tag into the page with the desired url or
   * a `<style type="text/css">` tag with the content.
   *
   * @param options - configure the CSS to add to the page.
   *
   * @returns a promise that resolves to the added tag when the stylesheets's
   * `onload` event fires or when the CSS content was injected into the
   * frame.
   */
  async addStyleTag(options: FrameAddStyleTagOptions): Promise<ElementHandle> {
    return this._mainWorld.addStyleTag(options);
  }

  /**
   *
   * This method clicks the first element found that matches `selector`.
   *
   * @remarks
   *
   * This method scrolls the element into view if needed, and then uses
   * {@link Page.mouse} to click in the center of the element. If there's no
   * element matching `selector`, the method throws an error.
   *
   * Bear in mind that if `click()` triggers a navigation event and there's a
   * separate `page.waitForNavigation()` promise to be resolved, you may end up
   * with a race condition that yields unexpected results. The correct pattern
   * for click and wait for navigation is the following:
   *
   * ```javascript
   * const [response] = await Promise.all([
   *   page.waitForNavigation(waitOptions),
   *   frame.click(selector, clickOptions),
   * ]);
   * ```
   * @param selector - the selector to search for to click. If there are
   * multiple elements, the first will be clicked.
   */
  async click(
    selector: string,
    options: {
      delay?: number;
      button?: MouseButton;
      clickCount?: number;
    } = {}
  ): Promise<void> {
    return this._secondaryWorld.click(selector, options);
  }

  /**
   * This method fetches an element with `selector` and focuses it.
   *
   * @remarks
   * If there's no element matching `selector`, the method throws an error.
   *
   * @param selector - the selector for the element to focus. If there are
   * multiple elements, the first will be focused.
   */
  async focus(selector: string): Promise<void> {
    return this._secondaryWorld.focus(selector);
  }

  /**
   * This method fetches an element with `selector`, scrolls it into view if
   * needed, and then uses {@link Page.mouse} to hover over the center of the
   * element.
   *
   * @remarks
   * If there's no element matching `selector`, the method throws an
   *
   * @param selector - the selector for the element to hover. If there are
   * multiple elements, the first will be hovered.
   */
  async hover(selector: string): Promise<void> {
    return this._secondaryWorld.hover(selector);
  }

  /**
   * Triggers a `change` and `input` event once all the provided options have
   * been selected.
   *
   * @remarks
   *
   * If there's no `<select>` element matching `selector`, the
   * method throws an error.
   *
   * @example
   * ```js
   * frame.select('select#colors', 'blue'); // single selection
   * frame.select('select#colors', 'red', 'green', 'blue'); // multiple selections
   * ```
   *
   * @param selector - a selector to query the frame for
   * @param values - an array of values to select. If the `<select>` has the
   * `multiple` attribute, all values are considered, otherwise only the first
   * one is taken into account.
   * @returns the list of values that were successfully selected.
   */
  select(selector: string, ...values: string[]): Promise<string[]> {
    return this._secondaryWorld.select(selector, ...values);
  }

  /**
   * This method fetches an element with `selector`, scrolls it into view if
   * needed, and then uses {@link Page.touchscreen} to tap in the center of the
   * element.
   *
   * @remarks
   *
   * If there's no element matching `selector`, the method throws an error.
   *
   * @param selector - the selector to tap.
   * @returns a promise that resolves when the element has been tapped.
   */
  async tap(selector: string): Promise<void> {
    return this._secondaryWorld.tap(selector);
  }

  /**
   * Sends a `keydown`, `keypress`/`input`, and `keyup` event for each character
   * in the text.
   *
   * @remarks
   * To press a special key, like `Control` or `ArrowDown`, use
   * {@link Keyboard.press}.
   *
   * @example
   * ```js
   * await frame.type('#mytextarea', 'Hello'); // Types instantly
   * await frame.type('#mytextarea', 'World', {delay: 100}); // Types slower, like a user
   * ```
   *
   * @param selector - the selector for the element to type into. If there are
   * multiple the first will be used.
   * @param text - text to type into the element
   * @param options - takes one option, `delay`, which sets the time to wait
   * between key presses in milliseconds. Defaults to `0`.
   *
   * @returns a promise that resolves when the typing is complete.
   */
  async type(
    selector: string,
    text: string,
    options?: { delay: number }
  ): Promise<void> {
    return this._mainWorld.type(selector, text, options);
  }

  /**
   * @remarks
   *
   * This method behaves differently depending on the first parameter. If it's a
   * `string`, it will be treated as a `selector` or `xpath` (if the string
   * starts with `//`). This method then is a shortcut for
   * {@link Frame.waitForSelector} or {@link Frame.waitForXPath}.
   *
   * If the first argument is a function this method is a shortcut for
   * {@link Frame.waitForFunction}.
   *
   * If the first argument is a `number`, it's treated as a timeout in
   * milliseconds and the method returns a promise which resolves after the
   * timeout.
   *
   * @param selectorOrFunctionOrTimeout - a selector, predicate or timeout to
   * wait for.
   * @param options - optional waiting parameters.
   * @param args - arguments to pass to `pageFunction`.
   *
   * @deprecated Don't use this method directly. Instead use the more explicit
   * methods available: {@link Frame.waitForSelector},
   * {@link Frame.waitForXPath}, {@link Frame.waitForFunction} or
   * {@link Frame.waitForTimeout}.
   */
  waitFor(
    selectorOrFunctionOrTimeout: string | number | Function,
    options: {} = {},
    ...args: SerializableOrJSHandle[]
  ): Promise<JSHandle | null> {
    const xPathPattern = '//';

    console.warn(
      'waitFor is deprecated and will be removed in a future release. See https://github.com/puppeteer/puppeteer/issues/6214 for details and how to migrate your code.'
    );

    if (helper.isString(selectorOrFunctionOrTimeout)) {
      const string = selectorOrFunctionOrTimeout;
      if (string.startsWith(xPathPattern))
        return this.waitForXPath(string, options);
      return this.waitForSelector(string, options);
    }
    if (helper.isNumber(selectorOrFunctionOrTimeout))
      return new Promise((fulfill) =>
        setTimeout(fulfill, selectorOrFunctionOrTimeout)
      );
    if (typeof selectorOrFunctionOrTimeout === 'function')
      return this.waitForFunction(
        selectorOrFunctionOrTimeout,
        options,
        ...args
      );
    return Promise.reject(
      new Error(
        'Unsupported target type: ' + typeof selectorOrFunctionOrTimeout
      )
    );
  }

  /**
   * Causes your script to wait for the given number of milliseconds.
   *
   * @remarks
   * It's generally recommended to not wait for a number of seconds, but instead
   * use {@link Frame.waitForSelector}, {@link Frame.waitForXPath} or
   * {@link Frame.waitForFunction} to wait for exactly the conditions you want.
   *
   * @example
   *
   * Wait for 1 second:
   *
   * ```
   * await frame.waitForTimeout(1000);
   * ```
   *
   * @param milliseconds - the number of milliseconds to wait.
   */
  waitForTimeout(milliseconds: number): Promise<void> {
    return new Promise((resolve) => {
      setTimeout(resolve, milliseconds);
    });
  }

  /**
   * @remarks
   *
   *
   * Wait for the `selector` to appear in page. If at the moment of calling the
   * method the `selector` already exists, the method will return immediately.
   * If the selector doesn't appear after the `timeout` milliseconds of waiting,
   * the function will throw.
   *
   * This method works across navigations.
   *
   * @example
   * ```js
   * const puppeteer = require('puppeteer');
   *
   * (async () => {
   *   const browser = await puppeteer.launch();
   *   const page = await browser.newPage();
   *   let currentURL;
   *   page.mainFrame()
   *   .waitForSelector('img')
   *   .then(() => console.log('First URL with image: ' + currentURL));
   *
   *   for (currentURL of ['https://example.com', 'https://google.com', 'https://bbc.com']) {
   *     await page.goto(currentURL);
   *   }
   *   await browser.close();
   * })();
   * ```
   * @param selector - the selector to wait for.
   * @param options - options to define if the element should be visible and how
   * long to wait before timing out.
   * @returns a promise which resolves when an element matching the selector
   * string is added to the DOM.
   */
  async waitForSelector(
    selector: string,
    options: WaitForSelectorOptions = {}
  ): Promise<ElementHandle | null> {
    const handle = await this._secondaryWorld.waitForSelector(
      selector,
      options
    );
    if (!handle) return null;
    const mainExecutionContext = await this._mainWorld.executionContext();
    const result = await mainExecutionContext._adoptElementHandle(handle);
    await handle.dispose();
    return result;
  }

  /**
   * @remarks
   * Wait for the `xpath` to appear in page. If at the moment of calling the
   * method the `xpath` already exists, the method will return immediately. If
   * the xpath doesn't appear after the `timeout` milliseconds of waiting, the
   * function will throw.
   *
   * For a code example, see the example for {@link Frame.waitForSelector}. That
   * function behaves identically other than taking a CSS selector rather than
   * an XPath.
   *
   * @param xpath - the XPath expression to wait for.
   * @param options  - options to configure the visiblity of the element and how
   * long to wait before timing out.
   */
  async waitForXPath(
    xpath: string,
    options: WaitForSelectorOptions = {}
  ): Promise<ElementHandle | null> {
    const handle = await this._secondaryWorld.waitForXPath(xpath, options);
    if (!handle) return null;
    const mainExecutionContext = await this._mainWorld.executionContext();
    const result = await mainExecutionContext._adoptElementHandle(handle);
    await handle.dispose();
    return result;
  }

  /**
   * @remarks
   *
   * @example
   *
   * The `waitForFunction` can be used to observe viewport size change:
   * ```js
   * const puppeteer = require('puppeteer');
   *
   * (async () => {
   * .  const browser = await puppeteer.launch();
   * .  const page = await browser.newPage();
   * .  const watchDog = page.mainFrame().waitForFunction('window.innerWidth < 100');
   * .  page.setViewport({width: 50, height: 50});
   * .  await watchDog;
   * .  await browser.close();
   * })();
   * ```
   *
   * To pass arguments from Node.js to the predicate of `page.waitForFunction` function:
   *
   * ```js
   * const selector = '.foo';
   * await frame.waitForFunction(
   *   selector => !!document.querySelector(selector),
   *   {}, // empty options object
   *   selector
   *);
   * ```
   *
   * @param pageFunction - the function to evaluate in the frame context.
   * @param options - options to configure the polling method and timeout.
   * @param args - arguments to pass to the `pageFunction`.
   * @returns the promise which resolve when the `pageFunction` returns a truthy value.
   */
  waitForFunction(
    pageFunction: Function | string,
    options: FrameWaitForFunctionOptions = {},
    ...args: SerializableOrJSHandle[]
  ): Promise<JSHandle> {
    return this._mainWorld.waitForFunction(pageFunction, options, ...args);
  }

  /**
   * @returns the frame's title.
   */
  async title(): Promise<string> {
    return this._secondaryWorld.title();
  }

  /**
   * @internal
   */
  _navigated(framePayload: Protocol.Page.Frame): void {
    this._name = framePayload.name;
    this._url = `${framePayload.url}${framePayload.urlFragment || ''}`;
  }

  /**
   * @internal
   */
  _navigatedWithinDocument(url: string): void {
    this._url = url;
  }

  /**
   * @internal
   */
  _onLifecycleEvent(loaderId: string, name: string): void {
    if (name === 'init') {
      this._loaderId = loaderId;
      this._lifecycleEvents.clear();
    }
    this._lifecycleEvents.add(name);
  }

  /**
   * @internal
   */
  _onLoadingStopped(): void {
    this._lifecycleEvents.add('DOMContentLoaded');
    this._lifecycleEvents.add('load');
  }

  /**
   * @internal
   */
  _detach(): void {
    this._detached = true;
    this._mainWorld._detach();
    this._secondaryWorld._detach();
    if (this._parentFrame) this._parentFrame._childFrames.delete(this);
    this._parentFrame = null;
  }
}

function assertNoLegacyNavigationOptions(options: {
  [optionName: string]: unknown;
}): void {
  assert(
    options['networkIdleTimeout'] === undefined,
    'ERROR: networkIdleTimeout option is no longer supported.'
  );
  assert(
    options['networkIdleInflight'] === undefined,
    'ERROR: networkIdleInflight option is no longer supported.'
  );
  assert(
    options.waitUntil !== 'networkidle',
    'ERROR: "networkidle" option is no longer supported. Use "networkidle2" instead'
  );
}