// @no-flow
const path = require("path");
const webpack = require("webpack");
const ManifestPlugin = require("webpack-manifest-plugin");
const SWPrecacheWebpackPlugin = require("sw-precache-webpack-plugin");
const StaticSiteGeneratorPlugin = require("static-site-generator-webpack-plugin");
const eslintFormatter = require("react-dev-utils/eslintFormatter");
const ModuleScopePlugin = require("react-dev-utils/ModuleScopePlugin");
const paths = require("./paths");
const getClientEnvironment = require("./env");

// 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;
// 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.");
}

// 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,
  // 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,
  // In production, we only want to load the polyfills and the app code.
  entry: {
    main: [require.resolve("./polyfills"), paths.appIndexJs],
    ssr: [require.resolve("./polyfills"), paths.appServerSideRenderingIndexJs],
  },
  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",
    chunkFilename: "static/js/[name].[chunkhash:8].chunk.js",
    // We inferred the "public path" (such as / or /my-project) from homepage.
    publicPath: publicPath,
    // Point sourcemap entries to original disk location (format as URL on Windows)
    devtoolModuleFilenameTemplate: (info) =>
      path
        .relative(paths.appSrc, info.absoluteResourcePath)
        .replace(/\\/g, "/"),
    // We need to use a UMD module to build the static site.
    libraryTarget: "umd",
  },
  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: [".web.js", ".mjs", ".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",
    },
    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]),
    ],
  },
  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 } },

      // First, run the linter.
      // It's important to do this before Babel processes the JS.
      {
        test: /\.(js|jsx|mjs)$/,
        enforce: "pre",
        use: [
          {
            options: {
              formatter: eslintFormatter,
              eslintPath: require.resolve("eslint"),
            },
            loader: require.resolve("eslint-loader"),
          },
        ],
        include: paths.appSrc,
      },
      {
        // "oneOf" will traverse all following loaders until one will
        // match the requirements. When no loader matches it will fall
        // back to the "file" loader at the end of the loader list.
        oneOf: [
          // "url" loader works just like "file" loader but it also embeds
          // assets smaller than specified size as data URLs to avoid requests.
          {
            test: [/\.bmp$/, /\.gif$/, /\.jpe?g$/, /\.png$/],
            loader: require.resolve("url-loader"),
            options: {
              limit: 10000,
              name: "static/media/[name].[hash:8].[ext]",
            },
          },
          // Process JS with Babel.
          {
            test: /\.(js|jsx|mjs)$/,
            include: paths.appSrc,
            loader: require.resolve("babel-loader"),
            options: {
              compact: true,
            },
          },
          {
            test: /\.css$/,
            loader: "css-loader", // TODO(@wchargin): add csso-loader
          },
          // "file" loader makes sure assets end up in the `build` folder.
          // When you `import` an asset, you get its filename.
          // This loader doesn't use a "test" so it will catch all modules
          // that fall through the other loaders.
          {
            loader: require.resolve("file-loader"),
            // Exclude `js` files to keep "css" loader working as it injects
            // it's runtime that would otherwise processed through "file" loader.
            // Also exclude `html` and `json` extensions so they get processed
            // by webpacks internal loaders.
            exclude: [/\.(js|jsx|mjs)$/, /\.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: [
    new StaticSiteGeneratorPlugin({
      entry: "ssr",
      paths: require(paths.appRouteData).routeData.map(({path}) => path),
      locals: {},
    }),
    // 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 webpack.optimize.UglifyJsPlugin({
      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,
    }),
    // 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$/, /moment$/),
  ],
  // 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: {
    dgram: "empty",
    fs: "empty",
    net: "empty",
    tls: "empty",
    child_process: "empty",
  },
};