"use strict";

/*
  Copyright 2018 Google LLC

  Use of this source code is governed by an MIT-style
  license that can be found in the LICENSE file or at
  https://opensource.org/licenses/MIT.
*/
const crypto = require('crypto');

module.exports = (compositeURL, dependencyDetails) => {
  let totalSize = 0;
  let compositeHash = '';

  for (const fileDetails of dependencyDetails) {
    totalSize += fileDetails.size;
    compositeHash += fileDetails.hash;
  }

  const md5 = crypto.createHash('md5');
  md5.update(compositeHash);
  const hashOfHashes = md5.digest('hex');
  return {
    file: compositeURL,
    hash: hashOfHashes,
    size: totalSize
  };
};