const path = require('path')
const webpack = require('webpack')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const config = require('../config')
const VueLoaderPlugin = require('vue-loader/lib/plugin')
const MiniCssExtractPlugin = require('mini-css-extract-plugin')
const TerserPlugin = require('terser-webpack-plugin')
const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin')

module.exports = {
  mode: 'production',
  entry: path.resolve(__dirname, '../../src/index.js'),
  output: {
    path: path.resolve(__dirname, '../../dist'),
    filename: 'assets/scripts/[name].[chunkhash:8].js',
    publicPath: config.prod.publicPath,
  },
  module: {
    rules: [
      {
        test: /\.css$/i,
        use: [
          MiniCssExtractPlugin.loader,
          {
            loader: 'css-loader',
            options: {
              importLoaders: 1,
            },
          },
          'postcss-loader',
        ],
      },
      {
        test: /\.s[ac]ss$/i,
        use: [
          MiniCssExtractPlugin.loader,
          {
            loader: 'css-loader',
            options: {
              importLoaders: 2,
            },
          },
          'postcss-loader',
          'sass-loader',
        ],
      },
      {
        test: /\.(png|jpe?g|gif|svg)$/i,
        loader: 'file-loader',
        options: {
          name: 'assets/images/[name].[contenthash:8].[ext]',
        },
      },
      {
        test: /\.js$/,
        enforce: 'pre',
        exclude: /node_modules/,
        loader: 'eslint-loader',
      },
      {
        test: /\.js$/,
        exclude: /node_modules/,
        loader: 'babel-loader',
      },
      {
        test: /\.vue$/,
        loader: 'vue-loader',
      },
    ],
  },
  optimization: {
    minimize: true,
    minimizer: [
      new TerserPlugin({
        terserOptions: {
          parse: {
            ecma: 8,
          },
          compress: {
            drop_console: true,
          },
          mangle: {
            safari10: true,
          },
        },
        cache: true,
        parallel: true,
      }),
      new OptimizeCSSAssetsPlugin(),
    ],
    splitChunks: {
      chunks: 'all',
      maxSize: 224000,
      cacheGroups: {
        vendors: {
          test: /[\\/]node_modules[\\/]/,
          name: 'vendors',
        },
      },
    },
  },
  externals: {
    vue: 'Vue',
  },
  resolve: {
    extensions: [
      '.js',
      '.vue',
    ],
    alias: {
      '@': path.resolve(__dirname, '../../src'),
    },
  },
  devtool: 'inline-source-map',
  plugins: [
    new HtmlWebpackPlugin({
      template: config.template,
      inject: true,
      minify: {
        collapseWhitespace: true,
        removeAttributeQuotes: true,
        removeComments: true,
      },
    }),
    new VueLoaderPlugin(),
    new webpack.HashedModuleIdsPlugin(),
    new webpack.DefinePlugin({
      'process.env': config.prod.env,
    }),
    new MiniCssExtractPlugin({
      filename: 'assets/styles/[name].[contenthash:8].css',
      chunkFilename: 'assets/styles/[name].[contenthash:8].chunk.css',
    }),
  ],
}