/**
 * 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 * as os from 'os';
import * as fs from 'fs';
import * as path from 'path';
import * as util from 'util';
import * as childProcess from 'child_process';
import * as https from 'https';
import * as http from 'http';

import * as extract from 'extract-zip';
import * as debug from 'debug';
import * as removeRecursive from 'rimraf';
import * as URL from 'url';
import * as ProxyAgent from 'https-proxy-agent';
import {getProxyForUrl} from 'proxy-from-env';

import {helper, assert} from './helper';
const debugFetcher = debug(`puppeteer:fetcher`);

const downloadURLs = {
  chrome: {
    linux: '%s/chromium-browser-snapshots/Linux_x64/%d/%s.zip',
    mac: '%s/chromium-browser-snapshots/Mac/%d/%s.zip',
    win32: '%s/chromium-browser-snapshots/Win/%d/%s.zip',
    win64: '%s/chromium-browser-snapshots/Win_x64/%d/%s.zip',
  },
  firefox: {
    linux: '%s/firefox-%s.0a1.en-US.%s-x86_64.tar.bz2',
    mac: '%s/firefox-%s.0a1.en-US.%s.dmg',
    win32: '%s/firefox-%s.0a1.en-US.%s.zip',
    win64: '%s/firefox-%s.0a1.en-US.%s.zip',
  },
} as const;

const browserConfig = {
  chrome: {
    host: 'https://storage.googleapis.com',
    destination: '.local-chromium',
  },
  firefox: {
    host: 'https://archive.mozilla.org/pub/firefox/nightly/latest-mozilla-central',
    destination: '.local-firefox',
  }
} as const;

type Platform = 'linux' | 'mac' | 'win32' | 'win64';
type Product = 'chrome' | 'firefox';

function archiveName(product: Product, platform: Platform, revision: string): string {
  if (product === 'chrome') {
    if (platform === 'linux')
      return 'chrome-linux';
    if (platform === 'mac')
      return 'chrome-mac';
    if (platform === 'win32' || platform === 'win64') {
      // Windows archive name changed at r591479.
      return parseInt(revision, 10) > 591479 ? 'chrome-win' : 'chrome-win32';
    }
  } else if (product === 'firefox') {
    return platform;
  }
}

/**
 * @param {string} product
 * @param {string} platform
 * @param {string} host
 * @param {string} revision
 * @return {string}
 */
function downloadURL(product: Product, platform: Platform, host: string, revision: string): string {
  const url = util.format(downloadURLs[product][platform], host, revision, archiveName(product, platform, revision));
  return url;
}

const readdirAsync = helper.promisify(fs.readdir.bind(fs));
const mkdirAsync = helper.promisify(fs.mkdir.bind(fs));
const unlinkAsync = helper.promisify(fs.unlink.bind(fs));
const chmodAsync = helper.promisify(fs.chmod.bind(fs));

function existsAsync(filePath: string): Promise<boolean> {
  return new Promise(resolve => {
    fs.access(filePath, err => resolve(!err));
  });
}

export interface BrowserFetcherOptions {
  platform?: Platform;
  product?: string;
  path?: string;
  host?: string;
}

interface BrowserFetcherRevisionInfo {
  folderPath: string;
  executablePath: string;
  url: string;
  local: boolean;
  revision: string;
  product: string;
}
/**
 */

export class BrowserFetcher {
  private _product: Product;
  private _downloadsFolder: string;
  private _downloadHost: string;
  private _platform: Platform;

  constructor(projectRoot: string, options: BrowserFetcherOptions = {}) {
    this._product = (options.product || 'chrome').toLowerCase() as Product;
    assert(this._product === 'chrome' || this._product === 'firefox', `Unknown product: "${options.product}"`);

    this._downloadsFolder = options.path || path.join(projectRoot, browserConfig[this._product].destination);
    this._downloadHost = options.host || browserConfig[this._product].host;
    this.setPlatform(options.platform);
    assert(downloadURLs[this._product][this._platform], 'Unsupported platform: ' + this._platform);
  }

  private setPlatform(platformFromOptions?: Platform): void {
    if (platformFromOptions) {
      this._platform = platformFromOptions;
      return;
    }

    const platform = os.platform();
    if (platform === 'darwin')
      this._platform = 'mac';
    else if (platform === 'linux')
      this._platform = 'linux';
    else if (platform === 'win32')
      this._platform = os.arch() === 'x64' ? 'win64' : 'win32';
    else
      assert(this._platform, 'Unsupported platform: ' + os.platform());
  }

  platform(): string {
    return this._platform;
  }

  product(): string {
    return this._product;
  }

  host(): string {
    return this._downloadHost;
  }

  canDownload(revision: string): Promise<boolean> {
    const url = downloadURL(this._product, this._platform, this._downloadHost, revision);
    return new Promise(resolve => {
      const request = httpRequest(url, 'HEAD', response => {
        resolve(response.statusCode === 200);
      });
      request.on('error', error => {
        console.error(error);
        resolve(false);
      });
    });
  }

  /**
   * @param {string} revision
   * @param {?function(number, number):void} progressCallback
   * @return {!Promise<!BrowserFetcher.RevisionInfo>}
   */
  async download(revision: string, progressCallback: (x: number, y: number) => void): Promise<BrowserFetcherRevisionInfo> {
    const url = downloadURL(this._product, this._platform, this._downloadHost, revision);
    const fileName = url.split('/').pop();
    const archivePath = path.join(this._downloadsFolder, fileName);
    const outputPath = this._getFolderPath(revision);
    if (await existsAsync(outputPath))
      return this.revisionInfo(revision);
    if (!(await existsAsync(this._downloadsFolder)))
      await mkdirAsync(this._downloadsFolder);
    try {
      await downloadFile(url, archivePath, progressCallback);
      await install(archivePath, outputPath);
    } finally {
      if (await existsAsync(archivePath))
        await unlinkAsync(archivePath);
    }
    const revisionInfo = this.revisionInfo(revision);
    if (revisionInfo)
      await chmodAsync(revisionInfo.executablePath, 0o755);
    return revisionInfo;
  }

  async localRevisions(): Promise<string[]> {
    if (!await existsAsync(this._downloadsFolder))
      return [];
    const fileNames = await readdirAsync(this._downloadsFolder);
    return fileNames.map(fileName => parseFolderPath(this._product, fileName)).filter(entry => entry && entry.platform === this._platform).map(entry => entry.revision);
  }

  async remove(revision: string): Promise<void> {
    const folderPath = this._getFolderPath(revision);
    assert(await existsAsync(folderPath), `Failed to remove: revision ${revision} is not downloaded`);
    await new Promise(fulfill => removeRecursive(folderPath, fulfill));
  }

  revisionInfo(revision: string): BrowserFetcherRevisionInfo {
    const folderPath = this._getFolderPath(revision);
    let executablePath = '';
    if (this._product === 'chrome') {
      if (this._platform === 'mac')
        executablePath = path.join(folderPath, archiveName(this._product, this._platform, revision), 'Chromium.app', 'Contents', 'MacOS', 'Chromium');
      else if (this._platform === 'linux')
        executablePath = path.join(folderPath, archiveName(this._product, this._platform, revision), 'chrome');
      else if (this._platform === 'win32' || this._platform === 'win64')
        executablePath = path.join(folderPath, archiveName(this._product, this._platform, revision), 'chrome.exe');
      else
        throw new Error('Unsupported platform: ' + this._platform);
    } else if (this._product === 'firefox') {
      if (this._platform === 'mac')
        executablePath = path.join(folderPath, 'Firefox Nightly.app', 'Contents', 'MacOS', 'firefox');
      else if (this._platform === 'linux')
        executablePath = path.join(folderPath, 'firefox', 'firefox');
      else if (this._platform === 'win32' || this._platform === 'win64')
        executablePath = path.join(folderPath, 'firefox', 'firefox.exe');
      else
        throw new Error('Unsupported platform: ' + this._platform);
    } else {
      throw new Error('Unsupported product: ' + this._product);
    }
    const url = downloadURL(this._product, this._platform, this._downloadHost, revision);
    const local = fs.existsSync(folderPath);
    debugFetcher({revision, executablePath, folderPath, local, url, product: this._product});
    return {revision, executablePath, folderPath, local, url, product: this._product};
  }

  /**
   * @param {string} revision
   * @return {string}
   */
  _getFolderPath(revision: string): string {
    return path.join(this._downloadsFolder, this._platform + '-' + revision);
  }
}

function parseFolderPath(product: Product, folderPath: string): {product: string; platform: string; revision: string} | null {
  const name = path.basename(folderPath);
  const splits = name.split('-');
  if (splits.length !== 2)
    return null;
  const [platform, revision] = splits;
  if (!downloadURLs[product][platform])
    return null;
  return {product, platform, revision};
}

/**
 * @param {string} url
 * @param {string} destinationPath
 * @param {?function(number, number):void} progressCallback
 * @return {!Promise}
 */
function downloadFile(url: string, destinationPath: string, progressCallback: (x: number, y: number) => void): Promise<void> {
  debugFetcher(`Downloading binary from ${url}`);
  let fulfill, reject;
  let downloadedBytes = 0;
  let totalBytes = 0;

  const promise = new Promise<void>((x, y) => { fulfill = x; reject = y; });

  const request = httpRequest(url, 'GET', response => {
    if (response.statusCode !== 200) {
      const error = new Error(`Download failed: server returned code ${response.statusCode}. URL: ${url}`);
      // consume response data to free up memory
      response.resume();
      reject(error);
      return;
    }
    const file = fs.createWriteStream(destinationPath);
    file.on('finish', () => fulfill());
    file.on('error', error => reject(error));
    response.pipe(file);
    totalBytes = parseInt(/** @type {string} */ (response.headers['content-length']), 10);
    if (progressCallback)
      response.on('data', onData);
  });
  request.on('error', error => reject(error));
  return promise;

  function onData(chunk: string): void {
    downloadedBytes += chunk.length;
    progressCallback(downloadedBytes, totalBytes);
  }
}

function install(archivePath: string, folderPath: string): Promise<unknown> {
  debugFetcher(`Installing ${archivePath} to ${folderPath}`);
  if (archivePath.endsWith('.zip'))
    return extractZip(archivePath, folderPath);
  else if (archivePath.endsWith('.tar.bz2'))
    return extractTar(archivePath, folderPath);
  else if (archivePath.endsWith('.dmg'))
    return mkdirAsync(folderPath).then(() => installDMG(archivePath, folderPath));
  else
    throw new Error(`Unsupported archive format: ${archivePath}`);
}

async function extractZip(zipPath: string, folderPath: string): Promise<void> {
  const nodeVersion = process.version;

  /* There is currently a bug with extract-zip and Node v14.0.0 that
   * causes extractZip to silently fail:
   * https://github.com/puppeteer/puppeteer/issues/5719
   *
   * Rather than silenty fail if the user is on Node 14 we instead
   * detect that and throw an error directing the user to that bug. The
   * rejection message below is surfaced to the user in the command
   * line.
   *
   * The issue seems to be in streams never resolving so we wrap the
   * call in a timeout and give it 10s to resolve before deciding on
   * an error.
   *
   * If the user is on Node < 14 we maintain the behaviour we had before
   * this patch.
   */
  if (nodeVersion.startsWith('v14.')) {
    let timeoutReject;
    const timeoutPromise = new Promise((resolve, reject) => { timeoutReject = reject; });

    const timeoutToken = setTimeout(() => {
      const error = new Error(`Puppeteer currently does not work on Node v14 due to an upstream bug. Please see: https://github.com/puppeteer/puppeteer/issues/5719 for details.`);
      timeoutReject(error);
    }, 10 * 1000);

    await Promise.race([
      extract(zipPath, {dir: folderPath}),
      timeoutPromise
    ]);

    clearTimeout(timeoutToken);
  } else {
    try {
      await extract(zipPath, {dir: folderPath});
    } catch (error) {
      return error;
    }
  }
}

/**
 * @param {string} tarPath
 * @param {string} folderPath
 * @return {!Promise<?Error>}
 */
function extractTar(tarPath: string, folderPath: string): Promise<unknown> {
  // eslint-disable-next-line @typescript-eslint/no-var-requires
  const tar = require('tar-fs');
  // eslint-disable-next-line @typescript-eslint/no-var-requires
  const bzip = require('unbzip2-stream');
  return new Promise((fulfill, reject) => {
    const tarStream = tar.extract(folderPath);
    tarStream.on('error', reject);
    tarStream.on('finish', fulfill);
    const readStream = fs.createReadStream(tarPath);
    readStream.on('data', () => { process.stdout.write('\rExtracting...'); });
    readStream.pipe(bzip()).pipe(tarStream);
  });
}

/**
 * Install *.app directory from dmg file
 *
 * @param {string} dmgPath
 * @param {string} folderPath
 * @return {!Promise<?Error>}
 */
function installDMG(dmgPath: string, folderPath: string): Promise<void> {
  let mountPath;

  function mountAndCopy(fulfill: () => void, reject: (Error) => void): void {
    const mountCommand = `hdiutil attach -nobrowse -noautoopen "${dmgPath}"`;
    childProcess.exec(mountCommand, (err, stdout) => {
      if (err)
        return reject(err);
      const volumes = stdout.match(/\/Volumes\/(.*)/m);
      if (!volumes)
        return reject(new Error(`Could not find volume path in ${stdout}`));
      mountPath = volumes[0];
      readdirAsync(mountPath).then(fileNames => {
        const appName = fileNames.filter(item => typeof item === 'string' && item.endsWith('.app'))[0];
        if (!appName)
          return reject(new Error(`Cannot find app in ${mountPath}`));
        const copyPath = path.join(mountPath, appName);
        debugFetcher(`Copying ${copyPath} to ${folderPath}`);
        childProcess.exec(`cp -R "${copyPath}" "${folderPath}"`, err => {
          if (err)
            reject(err);
          else
            fulfill();
        });
      }).catch(reject);
    });
  }

  function unmount(): void {
    if (!mountPath)
      return;
    const unmountCommand = `hdiutil detach "${mountPath}" -quiet`;
    debugFetcher(`Unmounting ${mountPath}`);
    childProcess.exec(unmountCommand, err => {
      if (err)
        console.error(`Error unmounting dmg: ${err}`);
    });
  }

  return new Promise<void>(mountAndCopy).catch(error => { console.error(error); }).finally(unmount);
}

function httpRequest(url: string, method: string, response: (x: http.IncomingMessage) => void): http.ClientRequest {
  const urlParsed = URL.parse(url);

 type Options = Partial<URL.UrlWithStringQuery> & {
   method?: string;
   agent?: ProxyAgent;
   rejectUnauthorized?: boolean;
 };

 let options: Options = {
   ...urlParsed,
   method,
 };

 const proxyURL = getProxyForUrl(url);
 if (proxyURL) {
   if (url.startsWith('http:')) {
     const proxy = URL.parse(proxyURL);
     options = {
       path: options.href,
       host: proxy.hostname,
       port: proxy.port,
     };
   } else {
     const parsedProxyURL = URL.parse(proxyURL);

     const proxyOptions = {
       ...parsedProxyURL,
       secureProxy: parsedProxyURL.protocol === 'https:',
     } as ProxyAgent.HttpsProxyAgentOptions;

     options.agent = new ProxyAgent(proxyOptions);
     options.rejectUnauthorized = false;
   }
 }

 const requestCallback = (res: http.IncomingMessage): void => {
   if (res.statusCode >= 300 && res.statusCode < 400 && res.headers.location)
     httpRequest(res.headers.location, method, response);
   else
     response(res);
 };
 const request = options.protocol === 'https:' ?
   https.request(options, requestCallback) :
   http.request(options, requestCallback);
 request.end();
 return request;
}