'use strict';

const path = require('path');
const webpack = require('webpack');
const { rules, plugins } = require('./webpack.common');
const TerserPlugin = require('terser-webpack-plugin');
const CopyPlugin = require('copy-webpack-plugin');
const CleanPlugin = require('clean-webpack-plugin');
const isDev = process.env.NODE_ENV !== 'production';

const resolveDir = dir => path.resolve(__dirname, dir);
const HTMLPlugin = require('html-webpack-plugin');
const html = new HTMLPlugin({
  title: 'yacd - Yet Another Clash Dashboard',
  template: 'src/index.template.ejs',
  inject: false,
  filename: 'index.html'
});

const svgSpriteRule = {
  test: /\.svg$/,
  use: ['svg-sprite-loader']
};

// ---- entry

const entry = {
  // app: ['whatwg-fetch', '@babel/polyfill', './src/app.js']
  app: ['whatwg-fetch', './src/app.js']
};

// ---- output

const output = {
  path: path.resolve(__dirname, 'public'),
  // use contenthash instead of chunkhash to take advantage of caching
  filename: isDev ? '[name].bundle.js' : '[name].[contenthash].js',
  publicPath: ''
};

// const vendor = ['redux', 'react', 'react-dom', 'react-router-dom'];

// if (!isDev) entry.vendor = vendor; // generate common vendor bundle in prod

// if (isDev) {
//   const dllRefPlugin = new webpack.DllReferencePlugin({
//     context: '.',
//     manifest: require('./public/vendor-manifest.json')
//   });
//   plugins.push(dllRefPlugin);
// }

// since we don't use dll plugin for now - we still get vendor's bundled in a separate bundle
// entry.vendor = vendor;
// entry.react = react;

const mode = isDev ? 'development' : 'production';

const definePlugin = new webpack.DefinePlugin({
  __DEV__: JSON.stringify(isDev),
  'process.env': {
    NODE_ENV: JSON.stringify(process.env.NODE_ENV)
  }
});

plugins.push(html);
plugins.push(definePlugin);
plugins.push(new CopyPlugin([{ from: 'assets/*', flatten: true }]));

if (!isDev) {
  plugins.push(
    new CleanPlugin(['**/*'], {
      root: path.join(__dirname, 'public'),
      verbose: false,
      beforeEmit: true
    })
  );
}

let devtool;
if (isDev) {
  devtool = 'eval-source-map';
} else {
  // devtool = 'source-map';
  devtool = false;
}

module.exports = {
  devtool,
  entry,
  output,
  mode,
  resolve: {
    alias: {
      a: resolveDir('src/api'),
      s: resolveDir('src/svg'),
      m: resolveDir('src/misc'),
      d: resolveDir('src/ducks'),
      c: resolveDir('src/components')
    }
  },
  module: {
    rules: [
      svgSpriteRule,
      rules.js,
      rules.file,
      rules.css,
      rules.cssModules,
      rules.sass,
      rules.sassCssModules
    ]
  },
  optimization: {
    splitChunks: {
      chunks: 'all',
      // see https://gist.github.com/sokra/1522d586b8e5c0f5072d7565c2bee693#optimizationruntimechunk
      cacheGroups: {
        // corejs: {
        //   test: /[\\/]node_modules[\\/](core-js)[\\/]/,
        //   chunks: 'all'
        // },
        // chartjs: {
        //   test: /[\\/]node_modules[\\/]chart\.js[\\/]/,
        //   // name: 'chartjs',
        //   chunks: 'all'
        // },
        react: {
          test: /[\\/]node_modules[\\/](react-dom|react|redux|react-router|react-router-dom|schedule|react-redux|react-modal)[\\/]/,
          chunks: 'all'
        }
      }
    },
    runtimeChunk: true,
    minimizer: [
      // the current uglifyjs-webpack-plugin has problems workin with React Hooks
      // see also:
      // https://github.com/webpack-contrib/uglifyjs-webpack-plugin/issues/374
      new TerserPlugin({
        cache: true,
        parallel: true
      })
    ]
  },
  plugins
};