const os = require('os');
const _ = require('lodash');
const webpack = require('webpack');
const merge = require('webpack-merge');
const UglifyJsparallelPlugin = require('webpack-uglify-parallel');
const OptimizeCSSPlugin = require('optimize-css-assets-webpack-plugin');
const ExtractTextPlugin = require('extract-text-webpack-plugin');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const AddAssetHtmlPlugin = require('add-asset-html-webpack-plugin');

const baseConfig = require('./webpack.base.conf.js');
const config = require('./config');
const utils = require('./utils');
const bundleConfig = require('./dll/bundle-config.json');

const assets = _.map(bundleConfig.vendor, (asset, name) => {
  return {
    filepath: require.resolve(`./dll/${asset}`),
    outputPath: utils.assetsPath(name),
    typeOfAsset: name,
    includeSourcemap: false,
    publicPath:
      (process.env.NODE_ENV === 'production' ? config.build.assetsPublicPath : config.dev.assetsPublicPath) +
      utils.assetsPath(name),
  };
});
const webpackConfig = merge(baseConfig, {
  module: {
    rules: utils.styleLoaders({
      sourceMap: false,
      extract: true,
    }),
  },
  devtool: config.build.productionSourceMap ? '#source-map' : false,
  output: {
    filename: utils.assetsPath('js/[name].[chunkhash:7].js'),
    chunkFilename: utils.assetsPath('js/[name].[chunkhash:7].js'),
  },
  plugins: [
    new webpack.DefinePlugin({
      'process.env': config.build.env,
    }),
    new UglifyJsparallelPlugin({
      workers: os.cpus().length,
      mangle: true,
      compress: {
        warnings: false,
      },
      comments: false,
      sourceMap: true,
    }),
    new ExtractTextPlugin({
      filename: utils.assetsPath('css/[name].[contenthash:7].css'),
    }),
    new OptimizeCSSPlugin({
      cssProcessorOptions: {
        safe: true,
      },
    }),
    new HtmlWebpackPlugin({
      filename: config.build.index,
      template: './index.html',
      inject: true,
      minify: {
        removeComments: true,
        collapseWhitespace: true,
        removeAttributeQuotes: true,
      },
    }),
    new AddAssetHtmlPlugin(assets),
    new webpack.DllReferencePlugin({
      context: __dirname,
      manifest: require('./dll/manifest.json'),
    }),
  ],
});

if (config.build.bundleAnalyzerReport) {
  const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;
  webpackConfig.plugins.push(new BundleAnalyzerPlugin());
}

module.exports = webpackConfig;