/**
 * 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 { execSync } from 'child_process';
import * as os from 'os';
import * as path from 'path';
import { assert, getFromENV } from '../helper';

export type BrowserName = 'chromium'|'webkit'|'firefox';
export type BrowserPlatform = 'win32'|'win64'|'mac10.13'|'mac10.14'|'mac10.15'|'linux';
export type BrowserDescriptor = {
	name: BrowserName,
	revision: string
};

export const hostPlatform = ((): BrowserPlatform => {
  const platform = os.platform();
  if (platform === 'darwin') {
    const macVersion = execSync('sw_vers -productVersion').toString('utf8').trim().split('.').slice(0, 2).join('.');
    return `mac${macVersion}` as BrowserPlatform;
  }
  if (platform === 'linux')
    return 'linux';
  if (platform === 'win32')
    return os.arch() === 'x64' ? 'win64' : 'win32';
  return platform as BrowserPlatform;
})();

function getRelativeExecutablePath(browserName: BrowserName): string[] | undefined {
  if (browserName === 'chromium') {
    return new Map<BrowserPlatform, string[]>([
      ['linux', ['chrome-linux', 'chrome']],
      ['mac10.13', ['chrome-mac', 'Chromium.app', 'Contents', 'MacOS', 'Chromium']],
      ['mac10.14', ['chrome-mac', 'Chromium.app', 'Contents', 'MacOS', 'Chromium']],
      ['mac10.15', ['chrome-mac', 'Chromium.app', 'Contents', 'MacOS', 'Chromium']],
      ['win32', ['chrome-win', 'chrome.exe']],
      ['win64', ['chrome-win', 'chrome.exe']],
    ]).get(hostPlatform);
  }

  if (browserName === 'firefox') {
    return new Map<BrowserPlatform, string[]>([
      ['linux', ['firefox', 'firefox']],
      ['mac10.13', ['firefox', 'Nightly.app', 'Contents', 'MacOS', 'firefox']],
      ['mac10.14', ['firefox', 'Nightly.app', 'Contents', 'MacOS', 'firefox']],
      ['mac10.15', ['firefox', 'Nightly.app', 'Contents', 'MacOS', 'firefox']],
      ['win32', ['firefox', 'firefox.exe']],
      ['win64', ['firefox', 'firefox.exe']],
    ]).get(hostPlatform);
  }

  if (browserName === 'webkit') {
    return new Map<BrowserPlatform, string[] | undefined>([
      ['linux', ['pw_run.sh']],
      ['mac10.13', undefined],
      ['mac10.14', ['pw_run.sh']],
      ['mac10.15', ['pw_run.sh']],
      ['win32', ['Playwright.exe']],
      ['win64', ['Playwright.exe']],
    ]).get(hostPlatform);
  }
}

export function browsersPath(packagePath: string): string {
  const result = getFromENV('PLAYWRIGHT_BROWSERS_PATH');
  return result || path.join(packagePath, '.local-browsers');
}

export function browserDirectory(packagePath: string, browser: BrowserDescriptor): string {
  return path.join(browsersPath(packagePath), `${browser.name}-${browser.revision}`);
}

export function executablePath(packagePath: string, browser: BrowserDescriptor): string {
  const relativePath = getRelativeExecutablePath(browser.name);
  assert(relativePath, `Unsupported platform for ${browser.name}: ${hostPlatform}`);
  return path.join(browserDirectory(packagePath, browser), ...relativePath);
}