const webpack = require("webpack");
const path = require("path");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const webpackBundleAnalyzer = require("webpack-bundle-analyzer");
const CopyPlugin = require("copy-webpack-plugin");
const config = require("./config");

process.env.NODE_ENV = config.prod.NODE_ENV;
process.env.PUBLIC_URL = config.prod.PUBLIC_URL;

let configs = {};
Object.keys(config.dev).forEach(z => {
  configs[`process.env.${z}`] = JSON.stringify(config.dev[z]);
});

module.exports = {
  mode: "production",
  target: "web",
  devtool: "source-map",
  entry: "./src/index",
  output: {
    path: path.resolve(__dirname, "build"),
    publicPath: process.env.PUBLIC_URL,
    filename: "bundle.js"
  },
  plugins: [
    // Display bundle stats
    new webpackBundleAnalyzer.BundleAnalyzerPlugin({ analyzerMode: "static" }),

    new MiniCssExtractPlugin({
      filename: "[name].[contenthash].css"
    }),

    new webpack.DefinePlugin(configs),
    new HtmlWebpackPlugin({
      template: "src/index.html",
      favicon: "src/favicon.ico",
      minify: {
        // see https://github.com/kangax/html-minifier#options-quick-reference
        removeComments: true,
        collapseWhitespace: true,
        removeRedundantAttributes: true,
        useShortDoctype: true,
        removeEmptyAttributes: true,
        removeStyleLinkTypeAttributes: true,
        keepClosingSlash: true,
        minifyJS: true,
        minifyCSS: true,
        minifyURLs: true
      }
    }),
    new CopyPlugin({
      patterns: [{ from: "public", to: "public" }]
    })
  ],
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        use: ["babel-loader", "eslint-loader"]
      },
      {
        test: /(\.css)$/,
        use: [
          MiniCssExtractPlugin.loader,
          {
            loader: "css-loader",
            options: {
              sourceMap: true
            }
          },
          {
            loader: "postcss-loader",
            options: {
              plugins: () => [require("cssnano")],
              sourceMap: true
            }
          }
        ]
      }
    ]
  }
};