'use strict'

const path = require('path')
const webpack = require('webpack')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const ExtractTextPlugin = require('extract-text-webpack-plugin')
const ManifestPlugin = require('webpack-manifest-plugin')
const InterpolateHtmlPlugin = require('react-dev-utils/InterpolateHtmlPlugin')
const SWPrecacheWebpackPlugin = require('sw-precache-webpack-plugin')
const ModuleScopePlugin = require('react-dev-utils/ModuleScopePlugin')
const ForkTsCheckerWebpackPlugin = require('fork-ts-checker-webpack-plugin')
const TsconfigPathsPlugin = require('tsconfig-paths-webpack-plugin')
const UglifyJsPlugin = require('uglifyjs-webpack-plugin')
const nodeExternals = require('webpack-node-externals')
const paths = require('./paths')
const getClientEnvironment = require('./env')
const alias = require('./alias')

delete alias.exotic
delete alias.proptypes

// Webpack uses `publicPath` to determine where the app is being served from.
// It requires a trailing slash, or the file assets will get an incorrect path.
const publicPath = paths.servedPath
// Some apps do not use client-side routing with pushState.
// For these, "homepage" can be set to "." to enable relative asset paths.
const shouldUseRelativeAssetPaths = publicPath === './'
// Source maps are resource heavy and can cause out of memory issue for large source files.
const shouldUseSourceMap = process.env.GENERATE_SOURCEMAP !== 'false'
// `publicUrl` is just like `publicPath`, but we will provide it to our app
// as %PUBLIC_URL% in `index.html` and `process.env.PUBLIC_URL` in JavaScript.
// Omit trailing slash as %PUBLIC_URL%/xyz looks better than %PUBLIC_URL%xyz.
const publicUrl = publicPath.slice(0, -1)
// Get environment variables to inject into our app.
const env = getClientEnvironment(publicUrl)

// Assert this just to be safe.
// Development builds of React are slow and not intended for production.
// if (env.stringified['process.env'].NODE_ENV !== '"production"') {
//   throw new Error('Production builds must have NODE_ENV=production.')
// }

// Note: defined here because it will be used more than once.
const cssFilename = 'static/css/[name].[contenthash:8].css'

// ExtractTextPlugin expects the build output to be flat.
// (See https://github.com/webpack-contrib/extract-text-webpack-plugin/issues/27)
// However, our output is structured with css, js and media folders.
// To have this structure working with relative paths, we have to use custom options.
const extractTextPluginOptions = shouldUseRelativeAssetPaths
  ? // Making sure that the publicPath goes back to to build folder.
    { publicPath: Array(cssFilename.split('/').length).join('../') }
  : {}

// This is the production configuration.
// It compiles slowly and is focused on producing a fast and minimal bundle.
// The development configuration is different and lives in a separate file.
module.exports = {
  // Don't attempt to continue if there are any errors.
  bail: true,
  // Webpack 4 feature - currently we are just building dev
  mode: 'development',

  // https://webpack.js.org/configuration/devtool/
  // We generate sourcemaps in production. This is slow but gives good results.
  // You can exclude the *.map files from the build during deployment.
  // devtool: shouldUseSourceMap ? 'source-map' : false,
  devtool: 'inline-source-map',

  // In production, we only want to load the polyfills and the app code.
  // entry: [require.resolve('./polyfills'), paths.appIndexJs],
  entry: [paths.appIndexJs],

  output: {
    // The build folder.
    path: paths.appBuild,
    // Generated JS file names (with nested folders).
    // There will be one main bundle, and one file per asynchronous chunk.
    // We don't currently advertise code splitting but Webpack supports it.
    //
    // filename: 'static/js/[name].[chunkhash:8].js',
    filename: '[name].js',
    // needed as-a-library
    libraryTarget: 'commonjs2',

    chunkFilename: 'static/js/[name].[chunkhash:8].chunk.js',
    // We inferred the "public path" (such as / or /my-project) from homepage.
    publicPath,
    // Point sourcemap entries to original disk location (format as URL on Windows)
    devtoolModuleFilenameTemplate: info =>
      path
        .relative(paths.appSrc, info.absoluteResourcePath)
        .replace(/\\/g, '/'),
  },
  resolve: {
    // This allows you to set a fallback for where Webpack should look for modules.
    // We placed these paths second because we want `node_modules` to "win"
    // if there are any conflicts. This matches Node resolution mechanism.
    // https://github.com/facebookincubator/create-react-app/issues/253
    modules: ['node_modules', paths.appNodeModules].concat(
      // It is guaranteed to exist because we tweak it in `env.js`
      process.env.NODE_PATH.split(path.delimiter).filter(Boolean)
    ),
    // These are the reasonable defaults supported by the Node ecosystem.
    // We also include JSX as a common component filename extension to support
    // some tools, although we do not recommend using it, see:
    // https://github.com/facebookincubator/create-react-app/issues/290
    // `web` extension prefixes have been added for better support
    // for React Native Web.
    extensions: [
      '.mjs',
      '.web.ts',
      '.ts',
      '.web.tsx',
      '.tsx',
      '.web.js',
      '.js',
      '.json',
      '.web.jsx',
      '.jsx',
    ],
    alias: {
      // Support React Native Web
      // https://www.smashingmagazine.com/2016/08/a-glimpse-into-the-future-with-react-native-for-web/
      'react-native': 'react-native-web',
      ...alias,
    },
    plugins: [
      // Prevents users from importing files from outside of src/ (or node_modules/).
      // This often causes confusion because we only process files within src/ with babel.
      // To fix this, we prevent you from importing files out of src/ -- if you'd like to,
      // please link the files into your node_modules/ and let module-resolution kick in.
      // Make sure your source files are compiled, as they will not be processed in any way.
      new ModuleScopePlugin(paths.appSrc, [paths.appPackageJson]),
      new TsconfigPathsPlugin({ configFile: paths.appTsConfig }),
    ],
  },
  module: {
    strictExportPresence: true,
    rules: [
      // TODO: Disable require.ensure as it's not a standard language feature.
      // We are waiting for https://github.com/facebookincubator/create-react-app/issues/2176.
      // { parser: { requireEnsure: false } },
      {
        test: /\.(js|jsx|mjs)$/,
        loader: require.resolve('source-map-loader'),
        enforce: 'pre',
        include: paths.appSrc,
      },
      {
        // "oneOf" will traverse all following loaders until one will
        // match the requirements. When no loader matches it will fall
        // back to the "file" loader at the end of the loader list.
        oneOf: [
          // "url" loader works just like "file" loader but it also embeds
          // assets smaller than specified size as data URLs to avoid requests.
          {
            test: [/\.bmp$/, /\.gif$/, /\.jpe?g$/, /\.png$/],
            loader: require.resolve('url-loader'),
            options: {
              limit: 10000,
              name: 'static/media/[name].[hash:8].[ext]',
            },
          },
          {
            test: /\.(js|jsx|mjs)$/,
            include: paths.appSrc,
            loader: require.resolve('babel-loader'),
            options: {
              compact: true,
            },
          },
          // Compile .tsx?
          {
            test: /\.(ts|tsx)$/,
            include: paths.appSrc,
            use: [
              {
                loader: require.resolve('ts-loader'),
                options: {
                  // disable type checker - we will use it in fork plugin
                  transpileOnly: true,
                },
              },
            ],
          },

          // "file" loader makes sure assets end up in the `build` folder.
          // When you `import` an asset, you get its filename.
          // This loader doesn't use a "test" so it will catch all modules
          // that fall through the other loaders.
          {
            loader: require.resolve('file-loader'),
            // Exclude `js` files to keep "css" loader working as it injects
            // it's runtime that would otherwise processed through "file" loader.
            // Also exclude `html` and `json` extensions so they get processed
            // by webpacks internal loaders.
            exclude: [/\.js$/, /\.html$/, /\.json$/],
            options: {
              name: 'static/media/[name].[hash:8].[ext]',
            },
          },
          // ** STOP ** Are you adding a new loader?
          // Make sure to add the new loader(s) before the "file" loader.
        ],
      },
    ],
  },
  plugins: [
    // Makes some environment variables available in index.html.
    // The public URL is available as %PUBLIC_URL% in index.html, e.g.:
    // <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
    // In production, it will be an empty string unless you specify "homepage"
    // in `package.json`, in which case it will be the pathname of that URL.
    // new InterpolateHtmlPlugin(env.raw),
    // // Generates an `index.html` file with the <script> injected.
    // new HtmlWebpackPlugin({
    //   inject: true,
    //   template: paths.appHtml,
    //   minify: {
    //     removeComments: true,
    //     collapseWhitespace: true,
    //     removeRedundantAttributes: true,
    //     useShortDoctype: true,
    //     removeEmptyAttributes: true,
    //     removeStyleLinkTypeAttributes: true,
    //     keepClosingSlash: true,
    //     minifyJS: true,
    //     minifyCSS: true,
    //     minifyURLs: true,
    //   },
    // }),
    // Makes some environment variables available to the JS code, for example:
    // if (process.env.NODE_ENV === 'production') { ... }. See `./env.js`.
    // It is absolutely essential that NODE_ENV was set to production here.
    // Otherwise React will be compiled in the very slow development mode.
    // new webpack.DefinePlugin(env.stringified),
    // Minify the code.
    // new UglifyJsPlugin({
    //   parallel: true,
    //   cache: true,
    //   uglifyOptions: {
    //     ecma: 8,
    //     compress: {
    //       warnings: false,
    //       // Disabled because of an issue with Uglify breaking seemingly valid code:
    //       // https://github.com/facebookincubator/create-react-app/issues/2376
    //       // Pending further investigation:
    //       // https://github.com/mishoo/UglifyJS2/issues/2011
    //       comparisons: false,
    //     },
    //     mangle: {
    //       safari10: true,
    //     },
    //     output: {
    //       comments: false,
    //       // Turned on because emoji and regex is not minified properly using default
    //       // https://github.com/facebookincubator/create-react-app/issues/2488
    //       ascii_only: true,
    //     },
    //   },
    //   sourceMap: shouldUseSourceMap,
    // }),
    // Note: this won't work without ExtractTextPlugin.extract(..) in `loaders`.
    // new ExtractTextPlugin({
    //   filename: cssFilename,
    // }),
    // Generate a manifest file which contains a mapping of all asset filenames
    // to their corresponding output file so that tools can pick it up without
    // having to parse `index.html`.
    new ManifestPlugin({
      fileName: 'asset-manifest.json',
    }),
    // Generate a service worker script that will precache, and keep up to date,
    // the HTML & assets that are part of the Webpack build.
    // new SWPrecacheWebpackPlugin({
    //   // By default, a cache-busting query parameter is appended to requests
    //   // used to populate the caches, to ensure the responses are fresh.
    //   // If a URL is already hashed by Webpack, then there is no concern
    //   // about it being stale, and the cache-busting can be skipped.
    //   dontCacheBustUrlsMatching: /\.\w{8}\./,
    //   filename: 'service-worker.js',
    //   logger(message) {
    //     if (message.indexOf('Total precache size is') === 0) {
    //       // This message occurs for every build and is a bit too noisy.
    //       return
    //     }
    //     if (message.indexOf('Skipping static resource') === 0) {
    //       // This message obscures real errors so we ignore it.
    //       // https://github.com/facebookincubator/create-react-app/issues/2612
    //       return
    //     }
    //     console.log(message)
    //   },
    //   minify: true,
    //   // For unknown URLs, fallback to the index page
    //   navigateFallback: publicUrl + '/index.html',
    //   // Ignores URLs starting from /__ (useful for Firebase):
    //   // https://github.com/facebookincubator/create-react-app/issues/2237#issuecomment-302693219
    //   navigateFallbackWhitelist: [/^(?!\/__).*/],
    //   // Don't precache sourcemaps (they're large) and build asset manifest:
    //   staticFileGlobsIgnorePatterns: [/\.map$/, /asset-manifest\.json$/],
    // }),
    // Moment.js is an extremely popular library that bundles large locale files
    // by default due to how Webpack interprets its code. This is a practical
    // solution that requires the user to opt into importing specific locales.
    // https://github.com/jmblog/how-to-optimize-momentjs-with-webpack
    // You can remove this if you don't use Moment.js:
    // new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/),
    // Perform type checking and linting in a separate process to speed up compilation
    // new ForkTsCheckerWebpackPlugin({
    //   async: false,
    //   tsconfig: paths.appTsConfig,
    //   tslint: paths.appTsLint,
    // }),
  ],
  // We are making all dependencies external so that we have a smaller output build
  // since this is a library, not an application
  // later, we can use rollup instead
  externals: [
    nodeExternals(),
    // https://github.com/liady/webpack-node-externals/blob/master/index.js
    function externals(context, request, callback) {
      // if (/node_modules/.test(request)) {
      console.log(request)
      if (request && request.includes && request.includes('node_modules')) {
        callback(null, 'commonjs ' + request)
        return
      }
      callback()
    },
    {
      exotic: 'exotic',
    },
  ],
  // Some libraries import Node modules but don't use them in the browser.
  // Tell Webpack to provide empty mocks for them so importing them works.
  node: {
    // https://github.com/webpack-contrib/css-loader/issues/454
    Buffer: false,
    dgram: 'empty',
    fs: 'empty',
    net: 'empty',
    tls: 'empty',
    child_process: 'empty',
  },
}