/**
 * 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 * as types from '../types';
import * as api from '../api';
import { helper } from '../helper';
import { TimeoutError } from '../errors';
import { DeviceDescriptors } from '../deviceDescriptors';
import { Chromium } from './chromium';
import { WebKit } from './webkit';
import { Firefox } from './firefox';

const packageJSON = require('../../package.json');

for (const className in api) {
  if (typeof (api as any)[className] === 'function')
    helper.installApiHooks(className[0].toLowerCase() + className.substring(1), (api as any)[className]);
}

type PlaywrightOptions = {
  downloadPath: string,
  browsers: Array<('firefox'|'webkit'|'chromium')>,
  respectEnvironmentVariables: boolean,
};

export class Playwright {
  readonly selectors = api.Selectors._instance();
  readonly devices: types.Devices;
  readonly errors: { TimeoutError: typeof TimeoutError };
  readonly chromium: (Chromium|undefined);
  readonly firefox: (Firefox|undefined);
  readonly webkit: (WebKit|undefined);

  constructor(options: PlaywrightOptions) {
    const {
      downloadPath,
      browsers,
      respectEnvironmentVariables,
    } = options;
    this.devices = DeviceDescriptors;
    this.errors = { TimeoutError };
    const downloadHost = respectEnvironmentVariables ? getFromENV('PLAYWRIGHT_DOWNLOAD_HOST') : undefined;
    if (browsers.includes('chromium'))
      this.chromium = new Chromium(downloadPath, downloadHost, packageJSON.playwright.chromium_revision);
    if (browsers.includes('webkit'))
      this.webkit = new WebKit(downloadPath, downloadHost, packageJSON.playwright.webkit_revision);
    if (browsers.includes('firefox'))
      this.firefox = new Firefox(downloadPath, downloadHost, packageJSON.playwright.firefox_revision);
  }
}

function getFromENV(name: string): (string|undefined) {
  let value = process.env[name];
  value = value || process.env[`npm_config_${name.toLowerCase()}`];
  value = value || process.env[`npm_package_config_${name.toLowerCase()}`];
  return value;
}