/**
 * 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';
import { assert } from './assert';
import { helper, debugError } from './helper';
import { Events } from './Events';
import { ExecutionContext, EVALUATION_SCRIPT_URL } from './ExecutionContext';
import { LifecycleWatcher, PuppeteerLifeCycleEvent } from './LifecycleWatcher';
import { DOMWorld, WaitForSelectorOptions } from './DOMWorld';
import { NetworkManager } from './NetworkManager';
import { TimeoutSettings } from './TimeoutSettings';
import { CDPSession } from './Connection';
import { JSHandle, ElementHandle } from './JSHandle';
import { MouseButtonInput } from './Input';
import { Page } from './Page';
import { HTTPResponse } from './HTTPResponse';
import Protocol from '../protocol';

const UTILITY_WORLD_NAME = '__puppeteer_utility_world__';

export class FrameManager extends EventEmitter {
  _client: CDPSession;
  _page: Page;
  _networkManager: NetworkManager;
  _timeoutSettings: TimeoutSettings;
  _frames = new Map<string, Frame>();
  _contextIdToContext = new Map<number, ExecutionContext>();
  _isolatedWorlds = new Set<string>();
  _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.enableReturnValue,
      Protocol.Page.getFrameTreeReturnValue
    >([
      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.lifecycleEventPayload): void {
    const frame = this._frames.get(event.frameId);
    if (!frame) return;
    frame._onLifecycleEvent(event.loaderId, event.name);
    this.emit(Events.FrameManager.LifecycleEvent, frame);
  }

  _onFrameStoppedLoading(frameId: string): void {
    const frame = this._frames.get(frameId);
    if (!frame) return;
    frame._onLoadingStopped();
    this.emit(Events.FrameManager.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, this._client, parentFrame, frameId);
    this._frames.set(frame._id, frame);
    this.emit(Events.FrameManager.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, this._client, null, framePayload.id);
      }
      this._frames.set(framePayload.id, frame);
      this._mainFrame = frame;
    }

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

    this.emit(Events.FrameManager.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(Events.FrameManager.FrameNavigatedWithinDocument, frame);
    this.emit(Events.FrameManager.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);
  }

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

  _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;
  }

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

export class Frame {
  _frameManager: FrameManager;
  _client: CDPSession;
  _parentFrame?: Frame;
  _id: string;

  _url = '';
  _detached = false;
  _loaderId = '';
  _name?: string;

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

  constructor(
    frameManager: FrameManager,
    client: CDPSession,
    parentFrame: Frame | null,
    frameId: string
  ) {
    this._frameManager = frameManager;
    this._client = client;
    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);
  }

  async goto(
    url: string,
    options: {
      referer?: string;
      timeout?: number;
      waitUntil?: PuppeteerLifeCycleEvent | PuppeteerLifeCycleEvent[];
    } = {}
  ): Promise<HTTPResponse | null> {
    return await this._frameManager.navigateFrame(this, url, options);
  }

  async waitForNavigation(
    options: {
      timeout?: number;
      waitUntil?: PuppeteerLifeCycleEvent | PuppeteerLifeCycleEvent[];
    } = {}
  ): Promise<HTTPResponse | null> {
    return await this._frameManager.waitForFrameNavigation(this, options);
  }

  executionContext(): Promise<ExecutionContext> {
    return this._mainWorld.executionContext();
  }

  async evaluateHandle(
    pageFunction: Function | string,
    ...args: unknown[]
  ): Promise<JSHandle> {
    return this._mainWorld.evaluateHandle(pageFunction, ...args);
  }

  async evaluate<ReturnType extends any>(
    pageFunction: Function | string,
    ...args: unknown[]
  ): Promise<ReturnType> {
    return this._mainWorld.evaluate<ReturnType>(pageFunction, ...args);
  }

  async $(selector: string): Promise<ElementHandle | null> {
    return this._mainWorld.$(selector);
  }

  async $x(expression: string): Promise<ElementHandle[]> {
    return this._mainWorld.$x(expression);
  }

  async $eval<ReturnType extends any>(
    selector: string,
    pageFunction: Function | string,
    ...args: unknown[]
  ): Promise<ReturnType> {
    return this._mainWorld.$eval<ReturnType>(selector, pageFunction, ...args);
  }

  async $$eval<ReturnType extends any>(
    selector: string,
    pageFunction: Function | string,
    ...args: unknown[]
  ): Promise<ReturnType> {
    return this._mainWorld.$$eval<ReturnType>(selector, pageFunction, ...args);
  }

  async $$(selector: string): Promise<ElementHandle[]> {
    return this._mainWorld.$$(selector);
  }

  async content(): Promise<string> {
    return this._secondaryWorld.content();
  }

  async setContent(
    html: string,
    options: {
      timeout?: number;
      waitUntil?: PuppeteerLifeCycleEvent | PuppeteerLifeCycleEvent[];
    } = {}
  ): Promise<void> {
    return this._secondaryWorld.setContent(html, options);
  }

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

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

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

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

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

  async addScriptTag(options: {
    url?: string;
    path?: string;
    content?: string;
    type?: string;
  }): Promise<ElementHandle> {
    return this._mainWorld.addScriptTag(options);
  }

  async addStyleTag(options: {
    url?: string;
    path?: string;
    content?: string;
  }): Promise<ElementHandle> {
    return this._mainWorld.addStyleTag(options);
  }

  async click(
    selector: string,
    options: {
      delay?: number;
      button?: MouseButtonInput;
      clickCount?: number;
    } = {}
  ): Promise<void> {
    return this._secondaryWorld.click(selector, options);
  }

  async focus(selector: string): Promise<void> {
    return this._secondaryWorld.focus(selector);
  }

  async hover(selector: string): Promise<void> {
    return this._secondaryWorld.hover(selector);
  }

  select(selector: string, ...values: string[]): Promise<string[]> {
    return this._secondaryWorld.select(selector, ...values);
  }

  async tap(selector: string): Promise<void> {
    return this._secondaryWorld.tap(selector);
  }

  async type(
    selector: string,
    text: string,
    options?: { delay: number }
  ): Promise<void> {
    return this._mainWorld.type(selector, text, options);
  }

  waitFor(
    selectorOrFunctionOrTimeout: string | number | Function,
    options: {} = {},
    ...args: unknown[]
  ): Promise<JSHandle | null> {
    const xPathPattern = '//';

    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
      )
    );
  }

  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;
  }

  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;
  }

  waitForFunction(
    pageFunction: Function | string,
    options: { polling?: string | number; timeout?: number } = {},
    ...args: unknown[]
  ): Promise<JSHandle> {
    return this._mainWorld.waitForFunction(pageFunction, options, ...args);
  }

  async title(): Promise<string> {
    return this._secondaryWorld.title();
  }

  _navigated(framePayload: Protocol.Page.Frame): void {
    this._name = framePayload.name;
    this._url = framePayload.url;
  }

  _navigatedWithinDocument(url: string): void {
    this._url = url;
  }

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

  _onLoadingStopped(): void {
    this._lifecycleEvents.add('DOMContentLoaded');
    this._lifecycleEvents.add('load');
  }

  _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'
  );
}
