#!/usr/bin/env node

/**
 * Copyright 2017, 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.
 */

'use strict';

const fs = require(`fs`);
const path = require(`path`);

const PROJECT_ROOT = path.join(__dirname, `..`);

// Dedupe package.json dependencies
// WARNING: This will fail if two different versions of the same package are required.
const pkgSet = {};

function getDeps (directory) {
  // Get subdirectories with a `package.json` file
  const directories = fs.readdirSync(directory)
    .filter((dir) => fs.existsSync(path.join(directory, dir, `package.json`)));

  let pkgJson;
  directories.forEach((dir) => {
    pkgJson = JSON.parse(fs.readFileSync(path.join(directory, dir, `package.json`)));
    Object.assign(pkgSet, pkgJson.dependencies);
  });
}

getDeps(PROJECT_ROOT);
getDeps(path.join(PROJECT_ROOT, 'endpoints/getting-started'));
getDeps(path.join(PROJECT_ROOT, 'functions'));
getDeps(path.join(PROJECT_ROOT, 'language/slackbot'));

console.log(JSON.stringify(pkgSet, null, 2));

// Update root-level package.json (by shelling to npm)
const spawn = require('child_process').spawn;
const args = [`add`, `-D`].concat(Object.keys(pkgSet).map(pkg => `${pkg}@${pkgSet[pkg]}`));
console.log(`yarn ${args.join(' ')}`);
spawn(`yarn`, args, {
  cwd: PROJECT_ROOT
});