'use strict'
const path = require('path')
const utils = require('./utils')

const webpack = require('webpack')
const config = require('../config')
const { merge } = require('webpack-merge')
const baseWebpackConfig = require('./webpack.base.conf')
const CopyWebpackPlugin = require('copy-webpack-plugin')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const MiniCssExtractPlugin = require('mini-css-extract-plugin')
const CssMinimizerPlugin = require('css-minimizer-webpack-plugin')
const TerserPlugin = require('terser-webpack-plugin')
const { BundleAnalyzerPlugin } = require('webpack-bundle-analyzer')

function resolve(dir) {
  return path.join(__dirname, '..', dir)
}

const env = require('../config/prod.env')

const webpackConfig = merge(baseWebpackConfig, {
  mode: 'production',
  devtool: config.build.productionSourceMap ? config.build.devtool : false,
  output: {
    path: config.build.assetsRoot,
    filename: utils.assetsPath('js/[name].[contenthash:8].js'),
    chunkFilename: utils.assetsPath('js/[name].[contenthash:8].chunk.js'),
    publicPath: config.build.assetsPublicPath
  },
  plugins: [
    new webpack.DefinePlugin({
      'process.env': env
    }),
    new MiniCssExtractPlugin({
      filename: utils.assetsPath('css/[name].[contenthash:8].css'),
      chunkFilename: utils.assetsPath('css/[name].[contenthash:8].css')
    }),
    new HtmlWebpackPlugin({
      filename: config.build.index,
      template: 'index.html',
      inject: true,
      favicon: resolve('favicon.ico'),
      title: '信息管理系统',
      minify: {
        removeComments: true,
        collapseWhitespace: true,
        removeAttributeQuotes: true,
        minifyCSS: true,
        minifyJS: true
      }
    }),
    new CopyWebpackPlugin({
      patterns: [
        {
          from: path.resolve(__dirname, '../static'),
          to: config.build.assetsSubDirectory,
          globOptions: {
            ignore: ['.*']
          }
        }
      ]
    })
  ],
  optimization: {
    minimize: true,
    minimizer: [
      new TerserPlugin({
        parallel: true,
        terserOptions: {
          compress: {
            drop_console: true
          }
        }
      }),
      new CssMinimizerPlugin()
    ],
    splitChunks: {
      chunks: 'all',
      cacheGroups: {
        libs: {
          name: 'chunk-libs',
          test: /[\\/]node_modules[\\/]/,
          priority: 10,
          chunks: 'initial'
        },
        elementUI: {
          name: 'chunk-elementUI',
          priority: 20,
          test: /[\\/]node_modules[\\/]element-ui[\\/]/
        },
        commons: {
          name: 'chunk-commons',
          test: resolve('src/components'),
          minChunks: 3,
          priority: 5,
          reuseExistingChunk: true
        }
      }
    },
    runtimeChunk: {
      name: 'runtime'
    }
  },
  performance: {
    hints: 'warning',
    maxEntrypointSize: 512000,
    maxAssetSize: 512000
  }
})

if (config.build.productionGzip) {
  const CompressionWebpackPlugin = require('compression-webpack-plugin')
  webpackConfig.plugins.push(
    new CompressionWebpackPlugin({
      filename: '[path][base].gz',
      algorithm: 'gzip',
      test: new RegExp(`\\.(${config.build.productionGzipExtensions.join('|')})$`),
      threshold: 10240,
      minRatio: 0.8
    })
  )
}

if (config.build.bundleAnalyzerReport) {
  webpackConfig.plugins.push(
    new BundleAnalyzerPlugin({
      analyzerPort: 8888
    })
  )
}

module.exports = webpackConfig