/**
 * @license
 * Copyright 2017 Google Inc.
 * SPDX-License-Identifier: Apache-2.0
 */

import assert from 'assert';
import {existsSync} from 'fs';
import {mkdir, unlink} from 'fs/promises';
import os from 'os';
import path from 'path';

import {
  Browser,
  BrowserPlatform,
  downloadUrls,
} from './browser-data/browser-data.js';
import {Cache, InstalledBrowser} from './Cache.js';
import {debug} from './debug.js';
import {detectBrowserPlatform} from './detectPlatform.js';
import {unpackArchive} from './fileUtil.js';
import {downloadFile, getJSON, headHttpRequest} from './httpUtil.js';

const debugInstall = debug('puppeteer:browsers:install');

const times = new Map<string, [number, number]>();
function debugTime(label: string) {
  times.set(label, process.hrtime());
}

function debugTimeEnd(label: string) {
  const end = process.hrtime();
  const start = times.get(label);
  if (!start) {
    return;
  }
  const duration =
    end[0] * 1000 + end[1] / 1e6 - (start[0] * 1000 + start[1] / 1e6); // calculate duration in milliseconds
  debugInstall(`Duration for ${label}: ${duration}ms`);
}

/**
 * @public
 */
export interface InstallOptions {
  /**
   * Determines the path to download browsers to.
   */
  cacheDir: string;
  /**
   * Determines which platform the browser will be suited for.
   *
   * @defaultValue **Auto-detected.**
   */
  platform?: BrowserPlatform;
  /**
   * Determines which browser to install.
   */
  browser: Browser;
  /**
   * Determines which buildId to download. BuildId should uniquely identify
   * binaries and they are used for caching.
   */
  buildId: string;
  /**
   * An alias for the provided `buildId`. It will be used to maintain local
   * metadata to support aliases in the `launch` command.
   *
   * @example 'canary'
   */
  buildIdAlias?: string;
  /**
   * Provides information about the progress of the download.
   */
  downloadProgressCallback?: (
    downloadedBytes: number,
    totalBytes: number
  ) => void;
  /**
   * Determines the host that will be used for downloading.
   *
   * @defaultValue Either
   *
   * - https://storage.googleapis.com/chrome-for-testing-public or
   * - https://archive.mozilla.org/pub/firefox/nightly/latest-mozilla-central
   *
   */
  baseUrl?: string;
  /**
   * Whether to unpack and install browser archives.
   *
   * @defaultValue `true`
   */
  unpack?: boolean;
  /**
   * @internal
   * @defaultValue `false`
   */
  forceFallbackForTesting?: boolean;
}

/**
 * @public
 */
export function install(
  options: InstallOptions & {unpack?: true}
): Promise<InstalledBrowser>;
/**
 * @public
 */
export function install(
  options: InstallOptions & {unpack: false}
): Promise<string>;
export async function install(
  options: InstallOptions
): Promise<InstalledBrowser | string> {
  options.platform ??= detectBrowserPlatform();
  options.unpack ??= true;
  if (!options.platform) {
    throw new Error(
      `Cannot download a binary for the provided platform: ${os.platform()} (${os.arch()})`
    );
  }
  const url = getDownloadUrl(
    options.browser,
    options.platform,
    options.buildId,
    options.baseUrl
  );
  try {
    return await installUrl(url, options);
  } catch (err) {
    // If custom baseUrl is provided, do not fall back to CfT dashboard.
    if (options.baseUrl && !options.forceFallbackForTesting) {
      throw err;
    }
    debugInstall(`Error downloading from ${url}.`);
    switch (options.browser) {
      case Browser.CHROME:
      case Browser.CHROMEDRIVER:
      case Browser.CHROMEHEADLESSSHELL: {
        debugInstall(
          `Trying to find download URL via https://googlechromelabs.github.io/chrome-for-testing.`
        );
        interface Version {
          downloads: Record<string, Array<{platform: string; url: string}>>;
        }
        const version = (await getJSON(
          new URL(
            `https://googlechromelabs.github.io/chrome-for-testing/${options.buildId}.json`
          )
        )) as Version;
        let platform = '';
        switch (options.platform) {
          case BrowserPlatform.LINUX:
            platform = 'linux64';
            break;
          case BrowserPlatform.MAC_ARM:
            platform = 'mac-arm64';
            break;
          case BrowserPlatform.MAC:
            platform = 'mac-x64';
            break;
          case BrowserPlatform.WIN32:
            platform = 'win32';
            break;
          case BrowserPlatform.WIN64:
            platform = 'win64';
            break;
        }
        const url = version.downloads[options.browser]?.find(link => {
          return link['platform'] === platform;
        })?.url;
        if (url) {
          debugInstall(`Falling back to downloading from ${url}.`);
          return await installUrl(new URL(url), options);
        }
        throw err;
      }
      default:
        throw err;
    }
  }
}

async function installUrl(
  url: URL,
  options: InstallOptions
): Promise<InstalledBrowser | string> {
  options.platform ??= detectBrowserPlatform();
  if (!options.platform) {
    throw new Error(
      `Cannot download a binary for the provided platform: ${os.platform()} (${os.arch()})`
    );
  }
  const fileName = url.toString().split('/').pop();
  assert(fileName, `A malformed download URL was found: ${url}.`);
  const cache = new Cache(options.cacheDir);
  const browserRoot = cache.browserRoot(options.browser);
  const archivePath = path.join(browserRoot, `${options.buildId}-${fileName}`);
  if (!existsSync(browserRoot)) {
    await mkdir(browserRoot, {recursive: true});
  }

  if (!options.unpack) {
    if (existsSync(archivePath)) {
      return archivePath;
    }
    debugInstall(`Downloading binary from ${url}`);
    debugTime('download');
    await downloadFile(url, archivePath, options.downloadProgressCallback);
    debugTimeEnd('download');
    return archivePath;
  }

  const outputPath = cache.installationDir(
    options.browser,
    options.platform,
    options.buildId
  );

  try {
    if (existsSync(outputPath)) {
      const installedBrowser = new InstalledBrowser(
        cache,
        options.browser,
        options.buildId,
        options.platform
      );
      if (!existsSync(installedBrowser.executablePath)) {
        throw new Error(
          `The browser folder (${outputPath}) exists but the executable (${installedBrowser.executablePath}) is missing`
        );
      }
      return installedBrowser;
    }
    debugInstall(`Downloading binary from ${url}`);
    try {
      debugTime('download');
      await downloadFile(url, archivePath, options.downloadProgressCallback);
    } finally {
      debugTimeEnd('download');
    }

    debugInstall(`Installing ${archivePath} to ${outputPath}`);
    try {
      debugTime('extract');
      await unpackArchive(archivePath, outputPath);
    } finally {
      debugTimeEnd('extract');
    }
    const installedBrowser = new InstalledBrowser(
      cache,
      options.browser,
      options.buildId,
      options.platform
    );
    if (options.buildIdAlias) {
      const metadata = installedBrowser.readMetadata();
      metadata.aliases[options.buildIdAlias] = options.buildId;
      installedBrowser.writeMetadata(metadata);
    }
    return installedBrowser;
  } finally {
    if (existsSync(archivePath)) {
      await unlink(archivePath);
    }
  }
}

/**
 * @public
 */
export interface UninstallOptions {
  /**
   * Determines the platform for the browser binary.
   *
   * @defaultValue **Auto-detected.**
   */
  platform?: BrowserPlatform;
  /**
   * The path to the root of the cache directory.
   */
  cacheDir: string;
  /**
   * Determines which browser to uninstall.
   */
  browser: Browser;
  /**
   * The browser build to uninstall
   */
  buildId: string;
}

/**
 *
 * @public
 */
export async function uninstall(options: UninstallOptions): Promise<void> {
  options.platform ??= detectBrowserPlatform();
  if (!options.platform) {
    throw new Error(
      `Cannot detect the browser platform for: ${os.platform()} (${os.arch()})`
    );
  }

  new Cache(options.cacheDir).uninstall(
    options.browser,
    options.platform,
    options.buildId
  );
}

/**
 * @public
 */
export interface GetInstalledBrowsersOptions {
  /**
   * The path to the root of the cache directory.
   */
  cacheDir: string;
}

/**
 * Returns metadata about browsers installed in the cache directory.
 *
 * @public
 */
export async function getInstalledBrowsers(
  options: GetInstalledBrowsersOptions
): Promise<InstalledBrowser[]> {
  return new Cache(options.cacheDir).getInstalledBrowsers();
}

/**
 * @public
 */
export async function canDownload(options: InstallOptions): Promise<boolean> {
  options.platform ??= detectBrowserPlatform();
  if (!options.platform) {
    throw new Error(
      `Cannot download a binary for the provided platform: ${os.platform()} (${os.arch()})`
    );
  }
  return await headHttpRequest(
    getDownloadUrl(
      options.browser,
      options.platform,
      options.buildId,
      options.baseUrl
    )
  );
}

function getDownloadUrl(
  browser: Browser,
  platform: BrowserPlatform,
  buildId: string,
  baseUrl?: string
): URL {
  return new URL(downloadUrls[browser](platform, buildId, baseUrl));
}