/**
 * @license
 * Copyright 2017 Google Inc.
 * SPDX-License-Identifier: Apache-2.0
 */
import {existsSync} from 'fs';
import {tmpdir} from 'os';
import {join} from 'path';

import {
  Browser as InstalledBrowser,
  CDP_WEBSOCKET_ENDPOINT_REGEX,
  launch,
  TimeoutError as BrowsersTimeoutError,
  WEBDRIVER_BIDI_WEBSOCKET_ENDPOINT_REGEX,
  computeExecutablePath,
} from '@puppeteer/browsers';

import {
  firstValueFrom,
  from,
  map,
  race,
  timer,
} from '../../third_party/rxjs/rxjs.js';
import type {Browser, BrowserCloseCallback} from '../api/Browser.js';
import {CdpBrowser} from '../cdp/Browser.js';
import {Connection} from '../cdp/Connection.js';
import {TimeoutError} from '../common/Errors.js';
import type {SupportedBrowser} from '../common/SupportedBrowser.js';
import {debugError, DEFAULT_VIEWPORT} from '../common/util.js';
import type {Viewport} from '../common/Viewport.js';

import type {ChromeReleaseChannel, LaunchOptions} from './LaunchOptions.js';
import {NodeWebSocketTransport as WebSocketTransport} from './NodeWebSocketTransport.js';
import {PipeTransport} from './PipeTransport.js';
import type {PuppeteerNode} from './PuppeteerNode.js';

/**
 * @internal
 */
export interface ResolvedLaunchArgs {
  isTempUserDataDir: boolean;
  userDataDir: string;
  executablePath: string;
  args: string[];
}

/**
 * Describes a launcher - a class that is able to create and launch a browser instance.
 *
 * @public
 */
export abstract class BrowserLauncher {
  #browser: SupportedBrowser;

  /**
   * @internal
   */
  puppeteer: PuppeteerNode;

  /**
   * @internal
   */
  constructor(puppeteer: PuppeteerNode, browser: SupportedBrowser) {
    this.puppeteer = puppeteer;
    this.#browser = browser;
  }

  get browser(): SupportedBrowser {
    return this.#browser;
  }

  async launch(options: LaunchOptions = {}): Promise<Browser> {
    const {
      dumpio = false,
      env = process.env,
      handleSIGINT = true,
      handleSIGTERM = true,
      handleSIGHUP = true,
      acceptInsecureCerts = false,
      defaultViewport = DEFAULT_VIEWPORT,
      downloadBehavior,
      slowMo = 0,
      timeout = 30000,
      waitForInitialPage = true,
      protocolTimeout,
    } = options;

    let {protocol} = options;

    // Default to 'webDriverBiDi' for Firefox.
    if (this.#browser === 'firefox' && protocol === undefined) {
      protocol = 'webDriverBiDi';
    }

    const launchArgs = await this.computeLaunchArguments({
      ...options,
      protocol,
    });

    if (!existsSync(launchArgs.executablePath)) {
      throw new Error(
        `Browser was not found at the configured executablePath (${launchArgs.executablePath})`,
      );
    }

    const usePipe = launchArgs.args.includes('--remote-debugging-pipe');

    const onProcessExit = async () => {
      await this.cleanUserDataDir(launchArgs.userDataDir, {
        isTemp: launchArgs.isTempUserDataDir,
      });
    };

    if (
      this.#browser === 'firefox' &&
      protocol !== 'webDriverBiDi' &&
      this.puppeteer.configuration.logLevel === 'warn'
    ) {
      console.warn(
        `Chrome DevTools Protocol (CDP) support for Firefox is deprecated in Puppeteer ` +
          `and it will be eventually removed. ` +
          `Use WebDriver BiDi instead (see https://pptr.dev/webdriver-bidi#get-started).`,
      );
    }

    if (
      this.#browser === 'firefox' &&
      protocol === 'webDriverBiDi' &&
      usePipe
    ) {
      throw new Error(
        'Pipe connections are not supported wtih Firefox and WebDriver BiDi',
      );
    }

    const browserProcess = launch({
      executablePath: launchArgs.executablePath,
      args: launchArgs.args,
      handleSIGHUP,
      handleSIGTERM,
      handleSIGINT,
      dumpio,
      env,
      pipe: usePipe,
      onExit: onProcessExit,
    });

    let browser: Browser;
    let cdpConnection: Connection;
    let closing = false;

    const browserCloseCallback: BrowserCloseCallback = async () => {
      if (closing) {
        return;
      }
      closing = true;
      await this.closeBrowser(browserProcess, cdpConnection);
    };

    try {
      if (this.#browser === 'firefox' && protocol === 'webDriverBiDi') {
        browser = await this.createBiDiBrowser(
          browserProcess,
          browserCloseCallback,
          {
            timeout,
            protocolTimeout,
            slowMo,
            defaultViewport,
            acceptInsecureCerts,
          },
        );
      } else {
        if (usePipe) {
          cdpConnection = await this.createCdpPipeConnection(browserProcess, {
            timeout,
            protocolTimeout,
            slowMo,
          });
        } else {
          cdpConnection = await this.createCdpSocketConnection(browserProcess, {
            timeout,
            protocolTimeout,
            slowMo,
          });
        }
        if (protocol === 'webDriverBiDi') {
          browser = await this.createBiDiOverCdpBrowser(
            browserProcess,
            cdpConnection,
            browserCloseCallback,
            {
              defaultViewport,
              acceptInsecureCerts,
            },
          );
        } else {
          browser = await CdpBrowser._create(
            this.browser,
            cdpConnection,
            [],
            acceptInsecureCerts,
            defaultViewport,
            downloadBehavior,
            browserProcess.nodeProcess,
            browserCloseCallback,
            options.targetFilter,
          );
        }
      }
    } catch (error) {
      void browserCloseCallback();
      if (error instanceof BrowsersTimeoutError) {
        throw new TimeoutError(error.message);
      }
      throw error;
    }

    if (waitForInitialPage) {
      await this.waitForPageTarget(browser, timeout);
    }

    return browser;
  }

  abstract executablePath(
    channel?: ChromeReleaseChannel,
    validatePath?: boolean,
  ): string;

  abstract defaultArgs(object: LaunchOptions): string[];

  /**
   * @internal
   */
  protected abstract computeLaunchArguments(
    options: LaunchOptions,
  ): Promise<ResolvedLaunchArgs>;

  /**
   * @internal
   */
  protected abstract cleanUserDataDir(
    path: string,
    opts: {isTemp: boolean},
  ): Promise<void>;

  /**
   * @internal
   */
  protected async closeBrowser(
    browserProcess: ReturnType<typeof launch>,
    cdpConnection?: Connection,
  ): Promise<void> {
    if (cdpConnection) {
      // Attempt to close the browser gracefully
      try {
        await cdpConnection.closeBrowser();
        await browserProcess.hasClosed();
      } catch (error) {
        debugError(error);
        await browserProcess.close();
      }
    } else {
      // Wait for a possible graceful shutdown.
      await firstValueFrom(
        race(
          from(browserProcess.hasClosed()),
          timer(5000).pipe(
            map(() => {
              return from(browserProcess.close());
            }),
          ),
        ),
      );
    }
  }

  /**
   * @internal
   */
  protected async waitForPageTarget(
    browser: Browser,
    timeout: number,
  ): Promise<void> {
    try {
      await browser.waitForTarget(
        t => {
          return t.type() === 'page';
        },
        {timeout},
      );
    } catch (error) {
      await browser.close();
      throw error;
    }
  }

  /**
   * @internal
   */
  protected async createCdpSocketConnection(
    browserProcess: ReturnType<typeof launch>,
    opts: {
      timeout: number;
      protocolTimeout: number | undefined;
      slowMo: number;
    },
  ): Promise<Connection> {
    const browserWSEndpoint = await browserProcess.waitForLineOutput(
      CDP_WEBSOCKET_ENDPOINT_REGEX,
      opts.timeout,
    );
    const transport = await WebSocketTransport.create(browserWSEndpoint);
    return new Connection(
      browserWSEndpoint,
      transport,
      opts.slowMo,
      opts.protocolTimeout,
    );
  }

  /**
   * @internal
   */
  protected async createCdpPipeConnection(
    browserProcess: ReturnType<typeof launch>,
    opts: {
      timeout: number;
      protocolTimeout: number | undefined;
      slowMo: number;
    },
  ): Promise<Connection> {
    // stdio was assigned during start(), and the 'pipe' option there adds the
    // 4th and 5th items to stdio array
    const {3: pipeWrite, 4: pipeRead} = browserProcess.nodeProcess.stdio;
    const transport = new PipeTransport(
      pipeWrite as NodeJS.WritableStream,
      pipeRead as NodeJS.ReadableStream,
    );
    return new Connection('', transport, opts.slowMo, opts.protocolTimeout);
  }

  /**
   * @internal
   */
  protected async createBiDiOverCdpBrowser(
    browserProcess: ReturnType<typeof launch>,
    connection: Connection,
    closeCallback: BrowserCloseCallback,
    opts: {
      defaultViewport: Viewport | null;
      acceptInsecureCerts?: boolean;
    },
  ): Promise<Browser> {
    const BiDi = await import(/* webpackIgnore: true */ '../bidi/bidi.js');
    const bidiConnection = await BiDi.connectBidiOverCdp(connection);
    return await BiDi.BidiBrowser.create({
      connection: bidiConnection,
      cdpConnection: connection,
      closeCallback,
      process: browserProcess.nodeProcess,
      defaultViewport: opts.defaultViewport,
      acceptInsecureCerts: opts.acceptInsecureCerts,
    });
  }

  /**
   * @internal
   */
  protected async createBiDiBrowser(
    browserProcess: ReturnType<typeof launch>,
    closeCallback: BrowserCloseCallback,
    opts: {
      timeout: number;
      protocolTimeout: number | undefined;
      slowMo: number;
      defaultViewport: Viewport | null;
      acceptInsecureCerts?: boolean;
    },
  ): Promise<Browser> {
    const browserWSEndpoint =
      (await browserProcess.waitForLineOutput(
        WEBDRIVER_BIDI_WEBSOCKET_ENDPOINT_REGEX,
        opts.timeout,
      )) + '/session';
    const transport = await WebSocketTransport.create(browserWSEndpoint);
    const BiDi = await import(/* webpackIgnore: true */ '../bidi/bidi.js');
    const bidiConnection = new BiDi.BidiConnection(
      browserWSEndpoint,
      transport,
      opts.slowMo,
      opts.protocolTimeout,
    );
    return await BiDi.BidiBrowser.create({
      connection: bidiConnection,
      closeCallback,
      process: browserProcess.nodeProcess,
      defaultViewport: opts.defaultViewport,
      acceptInsecureCerts: opts.acceptInsecureCerts,
    });
  }

  /**
   * @internal
   */
  protected getProfilePath(): string {
    return join(
      this.puppeteer.configuration.temporaryDirectory ?? tmpdir(),
      `puppeteer_dev_${this.browser}_profile-`,
    );
  }

  /**
   * @internal
   */
  resolveExecutablePath(
    headless?: boolean | 'shell',
    validatePath = true,
  ): string {
    let executablePath = this.puppeteer.configuration.executablePath;
    if (executablePath) {
      if (validatePath && !existsSync(executablePath)) {
        throw new Error(
          `Tried to find the browser at the configured path (${executablePath}), but no executable was found.`,
        );
      }
      return executablePath;
    }

    function puppeteerBrowserToInstalledBrowser(
      browser?: SupportedBrowser,
      headless?: boolean | 'shell',
    ) {
      switch (browser) {
        case 'chrome':
          if (headless === 'shell') {
            return InstalledBrowser.CHROMEHEADLESSSHELL;
          }
          return InstalledBrowser.CHROME;
        case 'firefox':
          return InstalledBrowser.FIREFOX;
      }
      return InstalledBrowser.CHROME;
    }

    const browserType = puppeteerBrowserToInstalledBrowser(
      this.browser,
      headless,
    );

    executablePath = computeExecutablePath({
      cacheDir: this.puppeteer.defaultDownloadPath!,
      browser: browserType,
      buildId: this.puppeteer.browserVersion,
    });

    if (validatePath && !existsSync(executablePath)) {
      const configVersion =
        this.puppeteer.configuration?.[this.browser]?.version;
      if (configVersion) {
        throw new Error(
          `Tried to find the browser at the configured path (${executablePath}) for version ${configVersion}, but no executable was found.`,
        );
      }
      switch (this.browser) {
        case 'chrome':
          throw new Error(
            `Could not find Chrome (ver. ${this.puppeteer.browserVersion}). This can occur if either\n` +
              ` 1. you did not perform an installation before running the script (e.g. \`npx puppeteer browsers install ${browserType}\`) or\n` +
              ` 2. your cache path is incorrectly configured (which is: ${this.puppeteer.configuration.cacheDirectory}).\n` +
              'For (2), check out our guide on configuring puppeteer at https://pptr.dev/guides/configuration.',
          );
        case 'firefox':
          throw new Error(
            `Could not find Firefox (rev. ${this.puppeteer.browserVersion}). This can occur if either\n` +
              ' 1. you did not perform an installation for Firefox before running the script (e.g. `npx puppeteer browsers install firefox`) or\n' +
              ` 2. your cache path is incorrectly configured (which is: ${this.puppeteer.configuration.cacheDirectory}).\n` +
              'For (2), check out our guide on configuring puppeteer at https://pptr.dev/guides/configuration.',
          );
      }
    }
    return executablePath;
  }
}
