/**
 * 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.
 */
const fs = require('fs');
const browserFetcher = require('./lib/server/browserFetcher.js');
const packageJSON = require('./package.json');

async function downloadBrowserWithProgressBar(downloadPath, browser, version = '') {
  let progressBar = null;
  let lastDownloadedBytes = 0;
  const revision = packageJSON.playwright[`${browser}_revision`];
  function progress(downloadedBytes, totalBytes) {
    if (!progressBar) {
      const ProgressBar = require('progress');
      progressBar = new ProgressBar(`Downloading ${browser} r${revision} - ${toMegabytes(totalBytes)} [:bar] :percent :etas `, {
        complete: '=',
        incomplete: ' ',
        width: 20,
        total: totalBytes,
        host: getFromENV('PLAYWRIGHT_DOWNLOAD_HOST'),
      });
    }
    const delta = downloadedBytes - lastDownloadedBytes;
    lastDownloadedBytes = downloadedBytes;
    progressBar.tick(delta);
  }
  const executablePath = await browserFetcher.downloadBrowser({
    downloadPath,
    browser,
    revision,
    progress,
  });
  logPolitely(`${browser} downloaded to ${downloadPath}`);
  return executablePath;
}

function toMegabytes(bytes) {
  const mb = bytes / 1024 / 1024;
  return `${Math.round(mb * 10) / 10} Mb`;
}

function logPolitely(toBeLogged) {
  const logLevel = process.env.npm_config_loglevel;
  const logLevelDisplay = ['silent', 'error', 'warn'].indexOf(logLevel) > -1;

  if (!logLevelDisplay)
    console.log(toBeLogged);
}

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

module.exports = {downloadBrowserWithProgressBar};