/**
 * 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 fs from 'fs';
import os from 'os';
import path from 'path';
import { CRBrowser } from './crBrowser';
import { Env, gracefullyCloseSet } from '../../utils/processLauncher';
import { kBrowserCloseMessageId } from './crConnection';
import { rewriteErrorMessage } from '../../utils/stackTrace';
import { BrowserType } from '../browserType';
import { ConnectionTransport, ProtocolRequest, WebSocketTransport } from '../transport';
import { CRDevTools } from './crDevTools';
import { Browser, BrowserOptions, BrowserProcess, PlaywrightOptions } from '../browser';
import * as types from '../types';
import { debugMode, fetchData, getUserAgent, headersArrayToObject, HTTPRequestParams, removeFolders, streamToString } from '../../utils/utils';
import { RecentLogsCollector } from '../../utils/debugLogger';
import { Progress, ProgressController } from '../progress';
import { TimeoutSettings } from '../../utils/timeoutSettings';
import { helper } from '../helper';
import { CallMetadata } from '../instrumentation';
import http from 'http';
import https from 'https';
import { registry } from '../../utils/registry';
import { ManualPromise } from '../../utils/async';

const ARTIFACTS_FOLDER = path.join(os.tmpdir(), 'playwright-artifacts-');

export class Chromium extends BrowserType {
  private _devtools: CRDevTools | undefined;

  constructor(playwrightOptions: PlaywrightOptions) {
    super('chromium', playwrightOptions);

    if (debugMode())
      this._devtools = this._createDevTools();
  }

  override async connectOverCDP(metadata: CallMetadata, endpointURL: string, options: { slowMo?: number, headers?: types.HeadersArray }, timeout?: number) {
    const controller = new ProgressController(metadata, this);
    controller.setLogName('browser');
    return controller.run(async progress => {
      return await this._connectOverCDPInternal(progress, endpointURL, options);
    }, TimeoutSettings.timeout({ timeout }));
  }

  async _connectOverCDPInternal(progress: Progress, endpointURL: string, options: { slowMo?: number, headers?: types.HeadersArray }, onClose?: () => Promise<void>) {
    let headersMap: { [key: string]: string; } | undefined;
    if (options.headers)
      headersMap = headersArrayToObject(options.headers, false);

    if (!headersMap)
      headersMap = { 'User-Agent': getUserAgent() };
    else if (headersMap && !Object.keys(headersMap).some(key => key.toLowerCase() === 'user-agent'))
      headersMap['User-Agent'] = getUserAgent();

    const artifactsDir = await fs.promises.mkdtemp(ARTIFACTS_FOLDER);

    const wsEndpoint = await urlToWSEndpoint(progress, endpointURL);
    progress.throwIfAborted();

    const chromeTransport = await WebSocketTransport.connect(progress, wsEndpoint, headersMap);
    const cleanedUp = new ManualPromise<void>();
    const doCleanup = async () => {
      await removeFolders([ artifactsDir ]);
      await onClose?.();
      cleanedUp.resolve();
    };
    const doClose = async () => {
      await chromeTransport.closeAndWait();
      await cleanedUp;
    };
    const browserProcess: BrowserProcess = { close: doClose, kill: doClose };
    const browserOptions: BrowserOptions = {
      ...this._playwrightOptions,
      slowMo: options.slowMo,
      name: 'chromium',
      isChromium: true,
      persistent: { noDefaultViewport: true },
      browserProcess,
      protocolLogger: helper.debugProtocolLogger(),
      browserLogsCollector: new RecentLogsCollector(),
      artifactsDir,
      downloadsPath: artifactsDir,
      tracesDir: artifactsDir,
      // On Windows context level proxies only work, if there isn't a global proxy
      // set. This is currently a bug in the CR/Windows networking stack. By
      // passing an arbitrary value we disable the check in PW land which warns
      // users in normal (launch/launchServer) mode since otherwise connectOverCDP
      // does not work at all with proxies on Windows.
      proxy: { server: 'per-context' },
    };
    progress.throwIfAborted();
    const browser = await CRBrowser.connect(chromeTransport, browserOptions);
    browser.on(Browser.Events.Disconnected, doCleanup);
    return browser;
  }

  private _createDevTools() {
    // TODO: this is totally wrong when using channels.
    const directory = registry.findExecutable('chromium').directory;
    return directory ? new CRDevTools(path.join(directory, 'devtools-preferences.json')) : undefined;
  }

  async _connectToTransport(transport: ConnectionTransport, options: BrowserOptions): Promise<CRBrowser> {
    let devtools = this._devtools;
    if ((options as any).__testHookForDevTools) {
      devtools = this._createDevTools();
      await (options as any).__testHookForDevTools(devtools);
    }
    return CRBrowser.connect(transport, options, devtools);
  }

  _rewriteStartupError(error: Error): Error {
    // These error messages are taken from Chromium source code as of July, 2020:
    // https://github.com/chromium/chromium/blob/70565f67e79f79e17663ad1337dc6e63ee207ce9/content/browser/zygote_host/zygote_host_impl_linux.cc
    if (!error.message.includes('crbug.com/357670') && !error.message.includes('No usable sandbox!') && !error.message.includes('crbug.com/638180'))
      return error;
    return rewriteErrorMessage(error, [
      `Chromium sandboxing failed!`,
      `================================`,
      `To workaround sandboxing issues, do either of the following:`,
      `  - (preferred): Configure environment to support sandboxing: https://playwright.dev/docs/troubleshooting`,
      `  - (alternative): Launch Chromium without sandbox using 'chromiumSandbox: false' option`,
      `================================`,
      ``,
    ].join('\n'));
  }

  _amendEnvironment(env: Env, userDataDir: string, executable: string, browserArguments: string[]): Env {
    return env;
  }

  _attemptToGracefullyCloseBrowser(transport: ConnectionTransport): void {
    const message: ProtocolRequest = { method: 'Browser.close', id: kBrowserCloseMessageId, params: {} };
    transport.send(message);
  }

  override async _launchWithSeleniumHub(progress: Progress, hubUrl: string, options: types.LaunchOptions): Promise<CRBrowser> {
    if (!hubUrl.endsWith('/'))
      hubUrl = hubUrl + '/';

    const args = this._innerDefaultArgs(options);
    args.push('--remote-debugging-port=0');
    let desiredCapabilities = { 'browserName': 'chrome', 'goog:chromeOptions': { args } };
    try {
      if (process.env.SELENIUM_REMOTE_CAPABILITIES) {
        const parsed = JSON.parse(process.env.SELENIUM_REMOTE_CAPABILITIES);
        desiredCapabilities = { ...desiredCapabilities, ...parsed };
        progress.log(`<selenium> using additional capabilities "${process.env.SELENIUM_REMOTE_CAPABILITIES}"`);
      }
    } catch (e) {
      progress.log(`<selenium> ignoring additional capabilities "${process.env.SELENIUM_REMOTE_CAPABILITIES}": ${e}`);
    }

    progress.log(`<selenium> connecting to ${hubUrl}`);
    const response = await fetchData({
      url: hubUrl + 'session',
      method: 'POST',
      data: JSON.stringify({
        desiredCapabilities,
        capabilities: { alwaysMatch: desiredCapabilities }
      }),
      timeout: progress.timeUntilDeadline(),
    }, seleniumErrorHandler);
    const value = JSON.parse(response).value;
    const sessionId = value.sessionId;
    progress.log(`<selenium> connected to sessionId=${sessionId}`);

    const disconnectFromSelenium = async () => {
      progress.log(`<selenium> disconnecting from sessionId=${sessionId}`);
      await fetchData({
        url: hubUrl + 'session/' + sessionId,
        method: 'DELETE',
      }).catch(error => progress.log(`<error disconnecting from selenium>: ${error}`));
      progress.log(`<selenium> disconnected from sessionId=${sessionId}`);
      gracefullyCloseSet.delete(disconnectFromSelenium);
    };
    gracefullyCloseSet.add(disconnectFromSelenium);

    try {
      const capabilities = value.capabilities;
      let endpointURL: URL;

      if (capabilities['se:cdp']) {
        // Selenium 4 - use built-in CDP websocket proxy.
        progress.log(`<selenium> using selenium v4`);
        const endpointURLString = addProtocol(capabilities['se:cdp']);
        endpointURL = new URL(endpointURLString);
        if (endpointURL.hostname === 'localhost' || endpointURL.hostname === '127.0.0.1')
          endpointURL.hostname = new URL(hubUrl).hostname;
        progress.log(`<selenium> retrieved endpoint ${endpointURL.toString()} for sessionId=${sessionId}`);
      } else {
        // Selenium 3 - resolve target node IP to use instead of localhost ws url.
        progress.log(`<selenium> using selenium v3`);
        const maybeChromeOptions = capabilities['goog:chromeOptions'];
        const chromeOptions = maybeChromeOptions && typeof maybeChromeOptions === 'object' ? maybeChromeOptions : undefined;
        const debuggerAddress = chromeOptions && typeof chromeOptions.debuggerAddress === 'string' ? chromeOptions.debuggerAddress : undefined;
        const chromeOptionsURL = typeof maybeChromeOptions === 'string' ? maybeChromeOptions : undefined;
        const endpointURLString = addProtocol(debuggerAddress || chromeOptionsURL);
        progress.log(`<selenium> retrieved endpoint ${endpointURLString} for sessionId=${sessionId}`);
        endpointURL = new URL(endpointURLString);
        if (endpointURL.hostname === 'localhost' || endpointURL.hostname === '127.0.0.1') {
          const sessionInfoUrl = new URL(hubUrl).origin + '/grid/api/testsession?session=' + sessionId;
          try {
            const sessionResponse = await fetchData({
              url: sessionInfoUrl,
              method: 'GET',
              timeout: progress.timeUntilDeadline(),
            }, seleniumErrorHandler);
            const proxyId = JSON.parse(sessionResponse).proxyId;
            endpointURL.hostname = new URL(proxyId).hostname;
            progress.log(`<selenium> resolved endpoint ip ${endpointURL.toString()} for sessionId=${sessionId}`);
          } catch (e) {
            progress.log(`<selenium> unable to resolve endpoint ip for sessionId=${sessionId}, running in standalone?`);
          }
        }
      }

      return await this._connectOverCDPInternal(progress, endpointURL.toString(), { slowMo: options.slowMo }, disconnectFromSelenium);
    } catch (e) {
      await disconnectFromSelenium();
      throw e;
    }
  }

  _defaultArgs(options: types.LaunchOptions, isPersistent: boolean, userDataDir: string): string[] {
    const chromeArguments = this._innerDefaultArgs(options);
    chromeArguments.push(`--user-data-dir=${userDataDir}`);
    if (options.useWebSocket)
      chromeArguments.push('--remote-debugging-port=0');
    else
      chromeArguments.push('--remote-debugging-pipe');
    if (isPersistent)
      chromeArguments.push('about:blank');
    else
      chromeArguments.push('--no-startup-window');
    return chromeArguments;
  }

  private _innerDefaultArgs(options: types.LaunchOptions): string[] {
    const { args = [], proxy } = options;
    const userDataDirArg = args.find(arg => arg.startsWith('--user-data-dir'));
    if (userDataDirArg)
      throw new Error('Pass userDataDir parameter to `browserType.launchPersistentContext(userDataDir, ...)` instead of specifying --user-data-dir argument');
    if (args.find(arg => arg.startsWith('--remote-debugging-pipe')))
      throw new Error('Playwright manages remote debugging connection itself.');
    if (args.find(arg => !arg.startsWith('-')))
      throw new Error('Arguments can not specify page to be opened');
    const chromeArguments = [...DEFAULT_ARGS];

    // See https://github.com/microsoft/playwright/issues/7362
    if (os.platform() === 'darwin')
      chromeArguments.push('--enable-use-zoom-for-dsf=false');

    if (options.devtools)
      chromeArguments.push('--auto-open-devtools-for-tabs');
    if (options.headless) {
      chromeArguments.push(
          '--headless',
          '--hide-scrollbars',
          '--mute-audio',
          '--blink-settings=primaryHoverType=2,availableHoverTypes=2,primaryPointerType=4,availablePointerTypes=4',
      );
    }
    if (options.chromiumSandbox !== true)
      chromeArguments.push('--no-sandbox');
    if (proxy) {
      const proxyURL = new URL(proxy.server);
      const isSocks = proxyURL.protocol === 'socks5:';
      // https://www.chromium.org/developers/design-documents/network-settings
      if (isSocks && !this._playwrightOptions.socksProxyPort) {
        // https://www.chromium.org/developers/design-documents/network-stack/socks-proxy
        chromeArguments.push(`--host-resolver-rules="MAP * ~NOTFOUND , EXCLUDE ${proxyURL.hostname}"`);
      }
      chromeArguments.push(`--proxy-server=${proxy.server}`);
      const proxyBypassRules = [];
      // https://source.chromium.org/chromium/chromium/src/+/master:net/docs/proxy.md;l=548;drc=71698e610121078e0d1a811054dcf9fd89b49578
      if (this._playwrightOptions.socksProxyPort)
        proxyBypassRules.push('<-loopback>');
      if (proxy.bypass)
        proxyBypassRules.push(...proxy.bypass.split(',').map(t => t.trim()).map(t => t.startsWith('.') ? '*' + t : t));
      if (!process.env.PLAYWRIGHT_DISABLE_FORCED_CHROMIUM_PROXIED_LOOPBACK && !proxyBypassRules.includes('<-loopback>'))
        proxyBypassRules.push('<-loopback>');
      if (proxyBypassRules.length > 0)
        chromeArguments.push(`--proxy-bypass-list=${proxyBypassRules.join(';')}`);
    }
    chromeArguments.push(...args);
    return chromeArguments;
  }
}

const DEFAULT_ARGS = [
  '--disable-background-networking',
  '--enable-features=NetworkService,NetworkServiceInProcess',
  '--disable-background-timer-throttling',
  '--disable-backgrounding-occluded-windows',
  '--disable-breakpad',
  '--disable-client-side-phishing-detection',
  '--disable-component-extensions-with-background-pages',
  '--disable-default-apps',
  '--disable-dev-shm-usage',
  '--disable-extensions',
  '--disable-features=ImprovedCookieControls,LazyFrameLoading,GlobalMediaControls,DestroyProfileOnBrowserClose,MediaRouter,AcceptCHFrame,AutoExpandDetailsElement',
  '--allow-pre-commit-input',
  '--disable-hang-monitor',
  '--disable-ipc-flooding-protection',
  '--disable-popup-blocking',
  '--disable-prompt-on-repost',
  '--disable-renderer-backgrounding',
  '--disable-sync',
  '--force-color-profile=srgb',
  '--metrics-recording-only',
  '--no-first-run',
  '--enable-automation',
  '--password-store=basic',
  '--use-mock-keychain',
  // See https://chromium-review.googlesource.com/c/chromium/src/+/2436773
  '--no-service-autorun',
  '--export-tagged-pdf'
];

async function urlToWSEndpoint(progress: Progress, endpointURL: string) {
  if (endpointURL.startsWith('ws'))
    return endpointURL;
  progress.log(`<ws preparing> retrieving websocket url from ${endpointURL}`);
  const httpURL = endpointURL.endsWith('/') ? `${endpointURL}json/version/` : `${endpointURL}/json/version/`;
  const request = endpointURL.startsWith('https') ? https : http;
  const json = await new Promise<string>((resolve, reject) => {
    request.get(httpURL, resp => {
      if (resp.statusCode! < 200 || resp.statusCode! >= 400) {
        reject(new Error(`Unexpected status ${resp.statusCode} when connecting to ${httpURL}.\n` +
        `This does not look like a DevTools server, try connecting via ws://.`));
      }
      let data = '';
      resp.on('data', chunk => data += chunk);
      resp.on('end', () => resolve(data));
    }).on('error', reject);
  });
  return JSON.parse(json).webSocketDebuggerUrl;
}

async function seleniumErrorHandler(params: HTTPRequestParams, response: http.IncomingMessage) {
  const body = await streamToString(response);
  let message = body;
  try {
    const json = JSON.parse(body);
    message = json.value.localizedMessage || json.value.message;
  } catch (e) {
  }
  return new Error(`Error connecting to Selenium at ${params.url}: ${message}`);
}

function addProtocol(url: string) {
  if (!['ws://', 'wss://', 'http://', 'https://'].some(protocol => url.startsWith(protocol)))
    return 'http://' + url;
  return url;
}