'use strict';
const autoprefixer = require('autoprefixer');
const path = require('path');
const webpack = require('webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const ManifestPlugin = require('webpack-manifest-plugin');
const InterpolateHtmlPlugin = require('react-dev-utils/InterpolateHtmlPlugin');
const SWPrecacheWebpackPlugin = require('sw-precache-webpack-plugin');
const eslintFormatter = require('react-dev-utils/eslintFormatter');
const ModuleScopePlugin = require('react-dev-utils/ModuleScopePlugin');
const MonacoWebpackPlugin = require('monaco-editor-webpack-plugin');

const TerserJSPlugin = require('terser-webpack-plugin');
const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin');

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

// Some apps do not use client-side routing with pushState.
// For these, "homepage" can be set to "." to enable relative asset paths.
let publicPath = '/react/build/';
let nodeEnv = process.env.NODE_ENV
if (nodeEnv === 'testBuild') {
	publicPath = 'https://testali-cdn.educoder.net/react/build/';
}
if (nodeEnv === 'preBuild') {
	publicPath = 'https://preali-cdn.educoder.net/react/build/';
}
if (nodeEnv === 'production') {
	publicPath = 'https://ali-cdn.educoder.net/react/build/';
}
const publicUrl = publicPath.slice(0, -1);
const shouldUseSourceMap = process.env.GENERATE_SOURCEMAP !== 'false';
const env = getClientEnvironment(publicPath);

// 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.
// 上线用的
module.exports = {
	optimization: {
		minimizer: [new TerserJSPlugin({}), new OptimizeCSSAssetsPlugin({})],
		splitChunks: {
			chunks: 'async',
			name: true,
			cacheGroups: {
				default: {
					minChunks: 2,
					priority: -20,
					reuseExistingChunk: true,
				}
				, monaco: {
					test: /[\\/]node_modules[\\/]monaco-editor/,
					name: "mc-monaco",
					chunks: "all",
					priority: 1,
				},
				vendors: {
					name: 'vendors',
					test: /[\\/]node_modules[\\/]/,
					priority: -10,
					chunks: "all"
				}
			}
		},
		runtimeChunk: true
	},
	bail: true,
	mode: 'production',
	devtool: false,
	entry: ['@babel/polyfill', paths.appIndexJs],
	output: {
		path: paths.appBuild,
		globalObject: 'this',
		filename: './static/js/[name].[contenthash:8].js',
		chunkFilename: './static/js/[name].[contenthash:8].chunk.js',
		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: ['.web.js', '.mjs', '.js', '.json', '.web.jsx', '.jsx'],
		alias: {
			"educoder": __dirname + "/../src/common/educoder.js",
			'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: [
			{
				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,
						exclude: /node_modules/,
						loader: require.resolve('babel-loader'),
					},

					{
						test: /\.css$/,
						use: [{
							loader: MiniCssExtractPlugin.loader,
							options: {
								publicPath
							},
						},
						{
							loader: require.resolve("css-loader"),
							options: {
								importLoaders: 1,
								sourceMap: shouldUseSourceMap,
							},
						},
						{
							loader: require.resolve('postcss-loader'),
							options: {
								ident: 'postcss',
								plugins: () => [
									require('postcss-flexbugs-fixes'),
									autoprefixer({
										browsers: [
											'>1%',
											'last 4 versions',
											'Firefox ESR',
											'not ie < 9', // React doesn't support IE8 anyway
										],
										flexbox: 'no-2009',
									}),
								],
							},
						}
						]
					},
					{
						test: /\.scss$/,
						use: [{
							loader: MiniCssExtractPlugin.loader,
							options: {
								publicPath
							},
						},
						{
							loader: require.resolve("css-loader"),
							options: {
								importLoaders: 1,
								sourceMap: shouldUseSourceMap,
							},
						},
						{
							loader: require.resolve("sass-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$/],
						options: {
							name: 'static/media/[name].[contenthash:8].[ext]',
						},
					}
				]
			},
			// --- Loaders for monaco ---
			{
				test: /\.ts?$/,
				include: path.join(__dirname, "node_modules", "monaco-editor"),
				use: ["awesome-typescript-loader"],
			},
			{
				test: /\.css$/,
				include: path.join(__dirname, "node_modules", "monaco-editor"),
				use: ["style-loader", "css-loader"],
			},
			{
				test: /\.ttf$/,
				include: path.join(__dirname, "node_modules", "monaco-editor"),
				use: ["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.
		// Generates an `index.html` file with the <script> injected.
		new HtmlWebpackPlugin({
			inject: false,
			template: paths.appHtml,
			minify: {
				removeComments: true,
				collapseWhitespace: true,
				removeRedundantAttributes: true,
				useShortDoctype: true,
				removeEmptyAttributes: true,
				removeStyleLinkTypeAttributes: true,
				keepClosingSlash: true,
				minifyJS: true,
				minifyCSS: true,
				minifyURLs: true,
			},
		}),
		new InterpolateHtmlPlugin(HtmlWebpackPlugin, env.raw),
		// 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),

		new MiniCssExtractPlugin({
			filename: 'static/css/[name].[contenthash:8].css',
			chunkFilename: 'static/css/[name].[contenthash:8].chunk.css',
		}),
		// 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$/, /moment$/),
		new MonacoWebpackPlugin({
			filename: "[name].[contenthash].bundle.js",
			features: [
				"coreCommands",
				"find",
				'bracketMatching',
				'caretOperations',
				'clipboard',
				'comment',
				'folding',
				'format',
				'iPadShowKeyboard',
				'hover',
				'snippets',
				'suggest'
			],
		}),
		new webpack.NamedChunksPlugin(),
		new webpack.HashedModuleIdsPlugin()
	],
	// 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',
	},
};