const path = require('path')
const webpack = require('webpack')

const src = path.resolve(__dirname, 'src')

const options = {
  enableOptimization: false
}

module.exports = env => {
  const getEnvVar = v => {
    return env ? env[v] : undefined
  }
  const getEnvVarStr = v => {
    return env ? JSON.stringify(env[v]) : undefined
  }

  const base = {
    entry: {
      enumListEditor: src + '/enum-list-editor/index.js',
      projectTab: src + '/project-tab/index.js',
      pivot: src + '/pivot/index.js'
    },
    output: {
      path: path.resolve(__dirname, '../backend/src/main/resources/client'),
      filename: '[name].bundle.js'
    },
    module: {
      rules: [
        {
          test: /\.js$/,
          exclude: /node_modules/,
          loader: ['babel-loader', 'eslint-loader']
        },
        {
          test: /\.css$/,
          use: ['style-loader', 'css-loader']
        }
      ]
    },
    plugins: [
      new webpack.DefinePlugin({
        LOCAL: false
      })
    ]
  }

  const dev = {
    devServer: {
      contentBase: path.resolve(__dirname, 'html'),
      publicPath: '/',
      compress: true,
      port: 8081,
      proxy: {
        '/jira-server': {
          target: getEnvVar('server'),
          pathRewrite: { '^/jira-server': '' },
          changeOrigin: true
        }
      }
    },
    plugins: [
      new webpack.DefinePlugin({
        LOCAL: getEnvVar('local'),
        USERNAME: getEnvVarStr('user'),
        PASSWORD: getEnvVarStr('password')
      })
    ]
  }

  const prod = {
  }

  //  это можно заменить react-loadable
  const optimization = {
    plugins: [
      new webpack.HashedModuleIdsPlugin()
    ],
    optimization: {
      runtimeChunk: 'single',
      splitChunks: {
        chunks: 'all',
        maxInitialRequests: Infinity,
        minSize: 0,
        cacheGroups: {
          vendor: {
            test: /[\\/]node_modules[\\/]/,
            name (module) {
              // get the name. E.g. node_modules/packageName/not/this/part.js
              // or node_modules/packageName
              const packageName = module.context.match(/[\\/]node_modules[\\/](.*?)([\\/]|$)/)[1]

              // npm package names are URL-safe, but some servers don't like @ symbols
              return `npm.${packageName.replace('@', '')}`
            }
          }
        }
      }
    }
  }

  //  собираем
  let conf = env && env.local ? { ...base, ...dev } : { ...base, ...prod }

  conf = options.enableOptimization ? { ...conf, ...optimization } : conf

  return conf
}