text: /*
   * Copyright (c) 2014, Groupon, Inc.
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * Redistributions of source code must retain the above copyright notice,
   * this list of conditions and the following disclaimer.
   *
   * Redistributions in binary form must reproduce the above copyright
   * notice, this list of conditions and the following disclaimer in the
   * documentation and/or other materials provided with the distribution.
   *
   * Neither the name of GROUPON nor the names of its contributors may be
   * used to endorse or promote products derived from this software without
   * specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
   * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
   * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
   * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
   * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  'use strict';
  
  const fs = require('fs');
  const path = require('path');
  
  const mkdirp = require('mkdirp');
  const async = require('async');
  
  const tempdir = require('./tempdir');
  const ensureSelenium = require('./selenium');
  const ensureChromedriver = require('./chromedriver');
  
  const TEMP_PATH = `${tempdir}testium`;
  const CHROMEDRIVER = 'chromedriver';
  const SELENIUM_JAR = 'selenium.jar';
  
  const BINARIES = [CHROMEDRIVER, SELENIUM_JAR];
  
  function makePaths(binPath, tempPath) {
    mkdirp.sync(binPath);
    return mkdirp.sync(tempPath);
  }
  
  function cleanupDir(dir) {
    function deleteIfExists(filename) {
      try {
        fs.unlinkSync(path.join(dir, filename));
      } catch (err) {
        if (err.code !== 'ENOENT') throw err;
      }
    }
  
    BINARIES.forEach(deleteIfExists);
  }
  
  function binariesExist(binPath) {
    return BINARIES.every(binary => {
      return fs.existsSync(`${binPath}/${binary}`);
    });
  }
  
  function ensure(binPath, callback) {
    if (binariesExist(binPath)) {
      return callback();
    }
    makePaths(binPath, TEMP_PATH);
    return async.parallel(
      [
        ensureSelenium(binPath, TEMP_PATH),
        ensureChromedriver(binPath, TEMP_PATH),
      ],
      callback
    );
  }
  
  function update(binPath, callback) {
    cleanupDir(binPath);
    return ensure(binPath, callback);
  }
  
  function forceUpdate(binPath, callback) {
    cleanupDir(binPath);
    cleanupDir(TEMP_PATH);
    return ensure(binPath, callback);
  }
  
  module.exports = {
    update,
    forceUpdate,
    ensure,
  };
  