const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const ReactRefreshWebpackPlugin = require('@pmmmwh/react-refresh-webpack-plugin');

module.exports = (env, argv) => {
  const isProduction = argv.mode === 'production';

  return {
    entry: './src/index.tsx',
    output: {
      path: path.resolve(__dirname, 'dist'),
      filename: 'bundle.js',
      clean: true,

      // Dev needs '/' for HMR WebSocket; prod uses '' for relative paths through proxies
      publicPath: isProduction ? '' : '/',
    },
    resolve: {
      extensions: ['.ts', '.tsx', '.js'],
    },
    module: {
      rules: [
        {
          test: /\.tsx?$/,
          exclude: /node_modules/,
          use: {
            loader: 'babel-loader',
            options: {
              presets: [
                '@babel/preset-env',
                ['@babel/preset-react', { runtime: 'automatic' }],
                '@babel/preset-typescript',
              ],
              plugins: isProduction ? [] : ['react-refresh/babel'],
            },
          },
        },
        {
          test: /\.css$/,
          use: [
            isProduction ? MiniCssExtractPlugin.loader : 'style-loader',
            'css-loader',
            'postcss-loader',
          ],
        },
      ],
    },
    plugins: [
      new HtmlWebpackPlugin({
        template: './src/index.html',
      }),
      ...(isProduction
        ? [new MiniCssExtractPlugin()]
        : [new ReactRefreshWebpackPlugin()]),
    ],
    devServer: {
      port: 3000,
      allowedHosts: 'all',
      historyApiFallback: {
        index: 'index.html',
      },
      hot: true,
      liveReload: true,
      proxy: [
        {
          context: ['/api'],
          target: 'http://localhost:8001',
        },
      ],
    },
  };
};