#!/usr/bin/env node

/**
 * Copyright 2016, Google, Inc.
 * 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 async = require('async');
const path = require('path');

require('shelljs/global');

// Run the command in up to 7 directories at a time
const queue = async.queue((directory, callback) => {
  runForDirectory(directory, callback);
}, 4);

queue.push('appengine/bower');
queue.push('appengine/express-memcached-session');
queue.push('appengine/geddy');
queue.push('appengine/grunt');
queue.push('appengine/hapi');
queue.push('appengine/koa');
queue.push('appengine/kraken');
queue.push('appengine/loopback');
queue.push('appengine/mailgun');
queue.push('appengine/mailjet');
queue.push('appengine/memcached');
queue.push('appengine/mongodb');
queue.push('appengine/parse-server');
queue.push('appengine/restify');
queue.push('appengine/sails');
queue.push('appengine/twilio');
queue.push('appengine/webpack');
queue.push('appengine/websockets');

/**
 * Run the command in the given directory
 *
 * @param {string} directory The name of the directory in which to run the
 * command.
 * @param {function} callback The callback function.
 */
function runForDirectory(directory, callback) {
  console.log(`${directory}...running "yarn install"`);
  exec('yarn install', {
    async: true,
    cwd: path.join(__dirname, '../', directory)
  }, function (err) {
    console.log(`${directory}...done`);
    callback(err);
  });
}

/**
 * Recursively run the command within a single directory.
 *
 * @param {string} directory The name of the directory in which to recursively
 * run the command.
 */
function queueDirectories(directory) {
  // Move into the directory
  cd(directory);

  // List the files in the directory
  ls('-dl', '*')
    // Find the directories within the directory
    .filter((file) => file.isDirectory() && file.name !== 'test' && file.name !== 'system-test')
    .forEach((file) => {
      queue.push(path.join(directory, file.name));
    });

  // Move out of the directory
  cd('..');
}