const webpack = require('webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const ModuleScopePlugin = require('react-dev-utils/ModuleScopePlugin');
const OfflinePlugin = require('offline-plugin');
const TerserPlugin = require('terser-webpack-plugin');
const { BundleAnalyzerPlugin } = require('webpack-bundle-analyzer');
const WebpackPwaManifest = require('webpack-pwa-manifest');
const CompressionPlugin = require('compression-webpack-plugin');
const WebpackPluginFrTheme = require('webpack-plugin-fr-theme');
const { HashedModuleIdsPlugin } = require('webpack');
const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin');
const { CleanWebpackPlugin } = require('clean-webpack-plugin');
const CopyWebpackPlugin = require('copy-webpack-plugin');
const ProgressBarPlugin = require('progress-bar-webpack-plugin');
const paths = require('./paths');
const getClientEnvironment = require('./env');
const loaders = require('./loader.prod');

const publicPath = paths.servedPath;
const publicUrl = publicPath.slice(0, -1);
const env = getClientEnvironment(publicUrl);

if (env.stringified['process.env'].NODE_ENV !== '"production"') {
  throw new Error('生产环境编译，必须设定环境变量为 NODE_ENV=production.');
}
module.exports = {
  mode: 'production',
  // build遇到错误，中止build
  bail: true,
  target: 'web',
  entry: [require.resolve('react-app-polyfill/ie11'), paths.appIndexJs],
  output: {
    path: paths.appBuild,
    pathinfo: true,
    publicPath: '',
    filename: 'assets/js/[name].[hash].js',
    sourceMapFilename: 'assets/js/[name].[hash].map',
    chunkFilename: 'assets/js/[name].[chunkhash].chunk.js',
  },
  resolve: {
    modules: [paths.appSrc, paths.appNodeModules],
    extensions: ['.jsx', '.js', '.scss', '.css', '.json'],
    alias: {
      '@': paths.appSrc,
    },
    plugins: [
      // 阻止从src和node_modules目录之外导入模块
      new ModuleScopePlugin(paths.appSrc, [paths.appPackageJson]),
    ],
  },
  optimization: {
    nodeEnv: 'production',
    sideEffects: true,
    noEmitOnErrors: true,
    runtimeChunk: true,
    minimize: true,
    minimizer: [
      new TerserPlugin({
        terserOptions: {
          warnings: false,
          parse: {},
          compress: {
            ecma: 5,
            warnings: false,
            comparisons: false,
            inline: 2,
          },
          mangle: true,
          output: {
            ecma: 5,
            comments: false,
            ascii_only: true,
          },
        },
        parallel: true,
        cache: true,
        sourceMap: true,
      }),
      new OptimizeCSSAssetsPlugin(),
    ],
    splitChunks: {
      chunks: 'async', // 必须三选一： "initial直接引入" | "all"(默认就是all)全部 | "async动态引入"
      minSize: 30000, // 最小尺寸，默认0
      minChunks: 1, // 最小 chunk ，默认1
      maxAsyncRequests: 5, // 最大异步请求数， 默认1
      maxInitialRequests: 3, // 最大初始化请求书，默认1
      name: false,
      cacheGroups: {
        vendor: {
          name: 'vendor',
          test: /[\\/]node_modules[\\/]/,
          chunks: 'all',
        },
        otherBase: {
          test: module =>
            /@ant-design|swagger-ui-react|react|prop-types|antd|recharts|lodash|react-quill/.test(module.context), // 直接使用 test 来做路径匹配，抽离react相关代码
          chunks: 'all',
          name: 'otherBase',
          priority: 10,
        },
        // styles: {
        //   name: 'styles',
        //   test: /\.(scss|css|less)$/,
        //   chunks: 'all',
        //   enforce: true,
        // },
      },
    },
  },
  module: {
    // 缺少exports，报错而不是警告
    strictExportPresence: true,
    rules: [
      loaders.jsLoader,
      {
        oneOf: [
          loaders.cssLoaderRule,
          loaders.scssLoaderRule,
          loaders.lessLoaderRule,
          loaders.svgSpriteLoader,
          loaders.fontWoffLoader,
          loaders.fontTtfLoader,
          loaders.imageLoader,
          loaders.mediaLoader,
          loaders.otherLoader,
        ],
      },
    ],
  },
  performance: {
    hints: false,
  },
  plugins: [
    // new ProgressBarPlugin(),
    new WebpackPluginFrTheme(),
    new webpack.DefinePlugin(env.stringified),
    new webpack.NamedModulesPlugin(),
    new webpack.optimize.ModuleConcatenationPlugin(),
    new webpack.optimize.OccurrenceOrderPlugin(true),
    new MiniCssExtractPlugin({
      filename: 'assets/css/app.[name].css',
      chunkFilename: 'assets/css/app.[contenthash:12].css',
    }),
    new webpack.ContextReplacementPlugin(/moment[\/\\]locale$/, /en-gb|zh-cn/),
    new CopyWebpackPlugin([
      {
        from: paths.appPublic,
        to: paths.appBuild,
      },
    ]),
    new HtmlWebpackPlugin({
      inject: true,
      template: paths.appHtml,
      sourceMap: true,
      minify: {
        removeComments: true,
        collapseWhitespace: true,
        removeRedundantAttributes: true,
        useShortDoctype: true,
        removeEmptyAttributes: true,
        removeStyleLinkTypeAttributes: true,
        keepClosingSlash: true,
        minifyJS: true,
        minifyCSS: true,
        minifyURLs: true,
      },
    }),
    new CleanWebpackPlugin(),
    new CompressionPlugin({
      algorithm: 'gzip',
      test: /\.js$|\.css$|\.html$/,
      threshold: 10240,
      minRatio: 0.8,
    }),
    new WebpackPwaManifest({
      name: 'AISware AI²',
      short_name: 'AISquare',
      description: '通用人工智能平台',
      background_color: '#fafafa',
      theme_color: '#b1624d',
      inject: true,
      ios: false,
    }),
    new HashedModuleIdsPlugin({
      hashFunction: 'sha256',
      hashDigest: 'hex',
      hashDigestLength: 20,
    }),
    new OfflinePlugin({
      relativePaths: true,
      appShell: '/',
      caches: 'all',
      AppCache: false,
      updateStrategy: 'changed',
      safeToUseOptionalCaches: true,
      ServiceWorker: {
        output: 'assets/js/sw.js',
        publicPath: 'assets/js',
        minify: true,
        events: true,
      },
    }),
    //new BundleAnalyzerPlugin(),
  ],
};