const path = require('path');
const webpack = require('webpack');
const merge = require('webpack-merge');
const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin');
const FaviconsWebpackPlugin = require('favicons-webpack-plugin');

const isProduction = process.env.NODE_ENV === 'production';

const common = {
  target: 'web',

  entry: {
    main: path.resolve(__dirname, 'src', 'index.jsx'),
  },

  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: isProduction ? '[name].[chunkhash].js' : '[name].js',
    publicPath: '/',
  },

  module: {
    rules: [
      {
        test: /\.jsx?$/,
        exclude: /node_modules(?!\/astralnalog)/,
        use: ['babel-loader?cacheDirectory=true'],
      },
      {
        test: /\.s?[ac]ss$/,
        use: [MiniCssExtractPlugin.loader, 'css-loader', 'postcss-loader', 'sass-loader'],
      },
      {
        test: /\.(png|svg|jpg|gif)$/,
        use: ['file-loader'],
      },
      {
        test: /\.(woff|woff2|eot|ttf|otf)$/,
        use: ['file-loader'],
      },
      {
        test: /\.(pdf)$/,
        use: ['file-loader?minetype=application/pdf'],
      },
    ],
  },

  plugins: [
    new webpack.DefinePlugin({
      'process.env': {
        NODE_ENV: JSON.stringify(process.env.NODE_ENV),
      },
    }),
    new HtmlWebpackPlugin({
      inject: false,
      cache: true,
      minify: isProduction,
      template: path.join('src', 'index.html'),
      title: 'Title',
    }),
    new MiniCssExtractPlugin({
      filename: isProduction ? '[name].[contenthash].css' : '[name].css',
      chunkFilename: isProduction ? '[name].[contenthash].chunk.css' : '[name].chunk.css',
    }),
  ],

  resolve: {
    extensions: ['.js', '.jsx', '.css', '.scss'],
  },

  devServer: {
    stats: 'minimal',
    historyApiFallback: true,
    contentBase: path.resolve(__dirname, 'dist'),
    proxy: {
      '/api': 'http://localhost:5000',
      '/api/hub': {
        ws: true,
        target: 'ws://localhost:5000/',
      },
    },
  },
};

module.exports = isProduction
  ? merge(common, {
    plugins: [
      new webpack.HashedModuleIdsPlugin(),
      new FaviconsWebpackPlugin('./src/favicon.svg'),
    ],
    optimization: {
      minimize: true,
      occurrenceOrder: true,
      runtimeChunk: true,
      splitChunks: {
        cacheGroups: {
          commons: {
            test: /[\\/]node_modules[\\/]/,
            name: 'vendors',
            chunks: 'all',
          },
        },
      },
      minimizer: [
        new UglifyJsPlugin({
          cache: true,
          parallel: true,
          uglifyOptions: {
            compress: {
              drop_console: true,
            },
            dead_code: true,
          },
        }),
        new OptimizeCSSAssetsPlugin({
          cssProcessorOptions: {
            discardUnused: { fontFace: false },
            discardComments: { removeAll: true },
          },
        }),
      ],
    },
  })
  : merge(common, {
    devtool: 'cheap-module-source-map',
    plugins: [new webpack.NamedModulesPlugin()],
  });