"use strict"

var autoprefixer = require("autoprefixer")
var webpack = require("webpack")
var HtmlWebpackPlugin = require("html-webpack-plugin")
var ExtractTextPlugin = require("extract-text-webpack-plugin")
var ManifestPlugin = require("webpack-manifest-plugin")
var InterpolateHtmlPlugin = require("react-dev-utils/InterpolateHtmlPlugin")
var paths = require("./paths")
var 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.
var 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.
var shouldUseRelativeAssetPaths = publicPath === "./"
// `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.
var publicUrl = publicPath.slice(0, -1)
// Get environment variables to inject into our app.
var 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("../") }
  : undefined

// 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: "source-map",
  // In production, we only want to load the polyfills and the app code.
  entry: [require.resolve("./polyfills"), 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",
    chunkFilename: "_static/js/[name].[chunkhash:8].chunk.js",
    // We inferred the "public path" (such as / or /my-project) from homepage.
    publicPath: publicPath
  },
  resolve: {
    // This allows you to set a fallback for where Webpack should look for modules.
    // We read `NODE_PATH` environment variable in `paths.js` and pass paths here.
    // We use `fallback` instead of `root` because we want `node_modules` to "win"
    // if there any conflicts. This matches Node resolution mechanism.
    // https://github.com/facebookincubator/create-react-app/issues/253
    fallback: paths.nodePaths,
    // 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
    extensions: [".js", ".json", ".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"
    }
  },

  module: {
    // First, run the linter.
    // It's important to do this before Babel processes the JS.
    preLoaders: [
      {
        test: /\.(js|jsx)$/,
        loader: "eslint",
        include: paths.appSrc
      }
    ],
    loaders: [
      // ** ADDING/UPDATING LOADERS **
      // The "url" loader handles all assets unless explicitly excluded.
      // The `exclude` list *must* be updated with every change to loader extensions.
      // When adding a new loader, you must add its `test`
      // as a new entry in the `exclude` list in the "url" loader.

      // "url" loader embeds assets smaller than specified size as data URLs to avoid requests.
      // Otherwise, it acts like the "file" loader.
      {
        exclude: [/\.html$/, /\.(js|jsx)$/, /\.css$/, /\.json$/, /\.svg$/, /\.md$/],
        loader: "url",
        query: {
          limit: 10000,
          name: "_static/media/[name].[hash:8].[ext]"
        }
      },
      // Process JS with Babel.
      {
        test: /\.(js|jsx)$/,
        include: paths.appSrc,
        loader: "babel"
      },
      // The notation here is somewhat confusing.
      // "postcss" loader applies autoprefixer to our CSS.
      // "css" loader resolves paths in CSS and adds assets as dependencies.
      // "style" loader normally turns CSS into JS modules injecting <style>,
      // but unlike in development configuration, we do something different.
      // `ExtractTextPlugin` first applies the "postcss" and "css" loaders
      // (second argument), then grabs the result CSS and puts it into a
      // separate file in our build process. This way we actually ship
      // a single CSS file in production instead of JS code injecting <style>
      // tags. If you use code splitting, however, any async bundles will still
      // use the "style" loader inside the async code so CSS from them won't be
      // in the main CSS file.
      {
        test: /\.css$/,
        loader: ExtractTextPlugin.extract(
          "style",
          "css?importLoaders=1!postcss",
          extractTextPluginOptions
        )
        // Note: this won't work without `new ExtractTextPlugin()` in `plugins`.
      },
      // JSON is not enabled by default in Webpack but both Node and Browserify
      // allow it implicitly so we also enable it.
      {
        test: /\.json$/,
        loader: "json"
      },
      // "file" loader for svg
      {
        test: /\.svg$/,
        loader: "file",
        query: {
          name: "_static/media/[name].[hash:8].[ext]"
        }
      },
      // HTML loader for Markdown files.
      {
        test: /\.md$/,
        loader: "html!markdown"
      }
      // ** STOP ** Are you adding a new loader?
      // Remember to add the new extension(s) to the "url" loader exclusion list.
    ]
  },

  // We use PostCSS for autoprefixing only.
  postcss: function() {
    return [
      autoprefixer({
        browsers: [
          ">1%",
          "last 4 versions",
          "Firefox ESR",
          "not ie < 9" // React doesn't support IE8 anyway
        ]
      })
    ]
  },
  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),
    // This helps ensure the builds are consistent if source hasn't changed:
    new webpack.optimize.OccurrenceOrderPlugin(),
    // Try to dedupe duplicated modules, if any:
    new webpack.optimize.DedupePlugin(),
    // Minify the code.
    new webpack.optimize.UglifyJsPlugin({
      compress: {
        screw_ie8: true, // React doesn't support IE8
        warnings: false
      },
      mangle: {
        screw_ie8: true
      },
      output: {
        comments: false,
        screw_ie8: true
      }
    }),
    // Note: this won't work without ExtractTextPlugin.extract(..) in `loaders`.
    new ExtractTextPlugin(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"
    })
  ],
  // 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: {
    fs: "empty",
    net: "empty",
    tls: "empty"
  }
}