"use strict";

const autoprefixer = require("autoprefixer");
const path = require("path");
const webpack = require("webpack");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const CaseSensitivePathsPlugin = require("case-sensitive-paths-webpack-plugin");
const InterpolateHtmlPlugin = require("react-dev-utils/InterpolateHtmlPlugin");
const WatchMissingNodeModulesPlugin = require("react-dev-utils/WatchMissingNodeModulesPlugin");
const eslintFormatter = require("react-dev-utils/eslintFormatter");
const ModuleScopePlugin = require("react-dev-utils/ModuleScopePlugin");
const getClientEnvironment = require("./env");
const paths = require("./paths");

// Webpack uses `publicPath` to determine where the app is being served from.
// In development, we always serve from the root. This makes config easier.
const 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_PATH%/xyz looks better than %PUBLIC_PATH%xyz.
const publicUrl = "";
// Get environment variables to inject into our app.
const env = getClientEnvironment(publicUrl);

// This is the development configuration.
// It is focused on developer experience and fast rebuilds.
// The production configuration is different and lives in a separate file.
module.exports = {
	// You may want 'eval' instead if you prefer to see the compiled output in DevTools.
	// See the discussion in https://github.com/facebookincubator/create-react-app/issues/343.
	devtool: "cheap-module-source-map",
	// These are the "entry points" to our application.
	// This means they will be the "root" imports that are included in JS bundle.
	// The first two entry points enable "hot" CSS and auto-refreshes for JS.
	entry: [
		// Include an alternative client for WebpackDevServer. A client's job is to
		// connect to WebpackDevServer by a socket and get notified about changes.
		// When you save a file, the client will either apply hot updates (in case
		// of CSS changes), or refresh the page (in case of JS changes). When you
		// make a syntax error, this client will display a syntax error overlay.
		// Note: instead of the default WebpackDevServer client, we use a custom one
		// to bring better experience for Create React App users. You can replace
		// the line below with these two lines if you prefer the stock client:
		// require.resolve('webpack-dev-server/client') + '?/',
		// require.resolve('webpack/hot/dev-server'),
		require.resolve("react-dev-utils/webpackHotDevClient"),
		// We ship a few polyfills by default:
		require.resolve("./polyfills"),
		// Errors should be considered fatal in development
		require.resolve("react-error-overlay"),
		// Finally, this is your app's code:
		paths.appIndexJs
		// We include the app code last so that if there is a runtime error during
		// initialization, it doesn't blow up the WebpackDevServer client, and
		// changing JS code would still trigger a refresh.
	],
	output: {
		// Next line is not used in dev but WebpackDevServer crashes without it:
		path: paths.appBuild,
		// Add /* filename */ comments to generated require()s in the output.
		pathinfo: true,
		// This does not produce a real file. It's just the virtual path that is
		// served by WebpackDevServer in development. This is the JS bundle
		// containing code from all our entry points, and the Webpack runtime.
		filename: "static/js/bundle.js",
		// There are also additional JS chunk files if you use code splitting.
		chunkFilename: "static/js/[name].chunk.js",
		// This is the URL that app is served from. We use "/" in development.
		publicPath: publicPath,
		// Point sourcemap entries to original disk location (format as URL on Windows)
		devtoolModuleFilenameTemplate: info =>
			path.resolve(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: [".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"
		},
		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)$/,
				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 like "file" loader except that it embeds assets
					// smaller than specified limit in bytes as data URLs to avoid requests.
					// A missing `test` is equivalent to a match.
					{
						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)$/,
						include: paths.appSrc,
						loader: require.resolve("babel-loader"),
						options: {

							// This is a feature of `babel-loader` for webpack (not Babel itself).
							// It enables caching results in ./node_modules/.cache/babel-loader/
							// directory for faster rebuilds.
							cacheDirectory: true
						}
					},
					// "postcss" loader applies autoprefixer to our CSS.
					// "css" loader resolves paths in CSS and adds assets as dependencies.
					// "style" loader turns CSS into JS modules that inject <style> tags.
					// In production, we use a plugin to extract that CSS to a file, but
					// in development "style" loader enables hot editing of CSS.
					{
						test: /\.css$/,
						use: [
							require.resolve("style-loader"),
							{
								loader: require.resolve("css-loader"),
								options: {
									importLoaders: 1
								}
							},
							{
								loader: require.resolve("postcss-loader"),
								options: {
									// Necessary for external CSS imports to work
									// https://github.com/facebookincubator/create-react-app/issues/2677
									ident: "postcss",
									plugins: () => [
										require("postcss-flexbugs-fixes"),
										autoprefixer({
											browsers: [
												">1%",
												"last 4 versions",
												"Firefox ESR",
												"not ie < 9" // React doesn't support IE8 anyway
											],
											flexbox: "no-2009"
										})
									]
								}
							}
						]
					},
					/*
					{
						test: /\.css$/,
						loader: `style!css?importLoaders=1&modules&localIdentName=[name]__[local]___[hash:base64:5]!postcss`
					},
					*/
					// "file" loader makes sure those assets get served by WebpackDevServer.
					// When you `import` an asset, you get its (virtual) filename.
					// In production, they would get copied to the `build` folder.
					// This loader don't uses a "test" so it will catch all modules
					// that fall through the other loaders.
					{
						// 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$/],
						loader: require.resolve("file-loader"),
						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 development, this will be an empty string.
		new InterpolateHtmlPlugin(env.raw),
		// Generates an `index.html` file with the <script> injected.
		new HtmlWebpackPlugin({
			inject: true,
			template: paths.appHtml
		}),
		// Add module names to factory functions so they appear in browser profiler.
		new webpack.NamedModulesPlugin(),
		// Makes some environment variables available to the JS code, for example:
		// if (process.env.NODE_ENV === 'development') { ... }. See `./env.js`.
		new webpack.DefinePlugin(env.stringified),
		// This is necessary to emit hot updates (currently CSS only):
		new webpack.HotModuleReplacementPlugin(),
		// Watcher doesn't work well if you mistype casing in a path so we use
		// a plugin that prints an error when you attempt to do this.
		// See https://github.com/facebookincubator/create-react-app/issues/240
		new CaseSensitivePathsPlugin(),
		// If you require a missing module and then `npm install` it, you still have
		// to restart the development server for Webpack to discover it. This plugin
		// makes the discovery automatic so you don't have to restart.
		// See https://github.com/facebookincubator/create-react-app/issues/186
		new WatchMissingNodeModulesPlugin(paths.appNodeModules),
		// 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"
	},
	// Turn off performance hints during development because we don't do any
	// splitting or minification in interest of speed. These warnings become
	// cumbersome.
	performance: {
		hints: false
	}
};
