'use strict';

const fs = require('fs');

const path = require('path');

const paths = require('./paths');

// Make sure that including paths.js after env.js will read .env variables.

delete require.cache[require.resolve('./paths')];

const NODE_ENV = process.env.NODE_ENV;

if (!NODE_ENV) {

  throw new Error(

    'The NODE_ENV environment variable is required but was not specified.'

  );

}

// https://github.com/bkeepers/dotenv#what-other-env-files-can-i-use

const dotenvFiles = [

  `${paths.dotenv}.${NODE_ENV}.local`,

  // Don't include `.env.local` for `test` environment

  // since normally you expect tests to produce the same

  // results for everyone

  NODE_ENV !== 'test' && `${paths.dotenv}.local`,

  `${paths.dotenv}.${NODE_ENV}`,

  paths.dotenv,

].filter(Boolean);

// Load environment variables from .env* files. Suppress warnings using silent

// if this file is missing. dotenv will never modify any environment variables

// that have already been set.  Variable expansion is supported in .env files.

// https://github.com/motdotla/dotenv

// https://github.com/motdotla/dotenv-expand

dotenvFiles.forEach(dotenvFile => {

  if (fs.existsSync(dotenvFile)) {

    require('dotenv-expand')(

      require('dotenv').config({

        path: dotenvFile,

      })

    );

  }

});

// We support resolving modules according to `NODE_PATH`.

// This lets you use absolute paths in imports inside large monorepos:

// https://github.com/facebook/create-react-app/issues/253.

// It works similar to `NODE_PATH` in Node itself:

// https://nodejs.org/api/modules.html#modules_loading_from_the_global_folders

// Note that unlike in Node, only *relative* paths from `NODE_PATH` are honored.

// Otherwise, we risk importing Node.js core modules into an app instead of webpack shims.

// https://github.com/facebook/create-react-app/issues/1023#issuecomment-265344421

// We also resolve them to make sure all tools using them work consistently.

const appDirectory = fs.realpathSync(process.cwd());

process.env.NODE_PATH = (process.env.NODE_PATH || '')

  .split(path.delimiter)

  .filter(folder => folder && !path.isAbsolute(folder))

  .map(folder => path.resolve(appDirectory, folder))

  .join(path.delimiter);

// Grab NODE_ENV and REACT_APP_* environment variables and prepare them to be

// injected into the application via DefinePlugin in webpack configuration.

const REACT_APP = /^REACT_APP_/i;

function getClientEnvironment(publicUrl) {

  const raw = Object.keys(process.env)

    .filter(key => REACT_APP.test(key))

    .reduce(

      (env, key) => {

        env[key] = process.env[key];

        return env;

      },

      {

        // Useful for determining whether we’re running in production mode.

        // Most importantly, it switches React into the correct mode.

        NODE_ENV: process.env.NODE_ENV || 'development',

        // Useful for resolving the correct path to static assets in `public`.

        // For example, <img src={process.env.PUBLIC_URL + '/img/logo.png'} />.

        // This should only be used as an escape hatch. Normally you would put

        // images into the `src` and `import` them in code to get their paths.

        PUBLIC_URL: publicUrl,

        // We support configuring the sockjs pathname during development.

        // These settings let a developer run multiple simultaneous projects.

        // They are used as the connection `hostname`, `pathname` and `port`

        // in webpackHotDevClient. They are used as the `sockHost`, `sockPath`

        // and `sockPort` options in webpack-dev-server.

        WDS_SOCKET_HOST: process.env.WDS_SOCKET_HOST,

        WDS_SOCKET_PATH: process.env.WDS_SOCKET_PATH,

        WDS_SOCKET_PORT: process.env.WDS_SOCKET_PORT,

        // Whether or not react-refresh is enabled.

        // It is defined here so it is available in the webpackHotDevClient.

        FAST_REFRESH: process.env.FAST_REFRESH !== 'false',

      }

    );

  // Stringify all values so we can feed into webpack DefinePlugin

  const stringified = {

    'process.env': Object.keys(raw).reduce((env, key) => {

      env[key] = JSON.stringify(raw[key]);

      return env;

    }, {}),

  };

  return {raw, stringified};

}

module.exports = getClientEnvironment;