/* global process :true, __dirname :true, module :true */

import path                     from 'path'
import webpack                  from 'webpack'
import TerserPlugin             from 'terser-webpack-plugin'
import ManifestPlugin           from 'webpack-manifest-plugin'
import PnpWebpackPlugin         from 'pnp-webpack-plugin'
import safePostCssParser        from 'postcss-safe-parser'
import HtmlWebpackPlugin        from 'html-webpack-plugin'
import MiniCssExtractPlugin     from 'mini-css-extract-plugin'
import OptimizeCSSAssetsPlugin  from 'optimize-css-assets-webpack-plugin'
import CaseSensitivePathsPlugin from 'case-sensitive-paths-webpack-plugin'

import { devStyleConfig, prodStyleConfig } from './build-configs'

const LAUNCH_COMMAND = process.env.npm_lifecycle_event
const isProduction = LAUNCH_COMMAND === 'prod'
// const isLocal = LAUNCH_COMMAND === 'local'
const shouldUseSourceMaps = isProduction
const PATHS = {
  app          : path.join(__dirname, 'app'),
  build        : path.join(__dirname, 'build'),
  redux        : path.join(__dirname, 'app/redux'),
  reduxUtils   : path.join(__dirname, 'app/redux/utils'),
  styles       : path.join(__dirname, 'app/styles'),
  configs      : path.join(__dirname, 'app/configs'),
  components   : path.join(__dirname, 'app/components'),
  containers   : path.join(__dirname, 'app/containers'),
  reduxModules : path.join(__dirname, 'app/redux/modules')
}

// Plugins Initialization with configs
const caseSensitivePathPlugin = new CaseSensitivePathsPlugin({
  debug : true
})

const terserPlugin = new TerserPlugin({
  cache         : true,
  parallel      : true,
  sourceMap     : shouldUseSourceMaps,
  terserOptions : {
    parse : {
      ecma : 8
    },
    compress : {
      // warning     : true, // Could cause problems
      comparisons : false,
      ecma        : 5,
      inline      : 2
    },
    output : {
      ascii_only : true,
      ecma       : 5
    }
  }
})

const optimizeCSSAssetsPlugin = new OptimizeCSSAssetsPlugin({
  cssProcessorOptions : {
    parser : safePostCssParser,
    map    : shouldUseSourceMaps
      ? {
          inline     : false,
          annotation : true
        }
      : false
  }
})
const defaultHtmlPlugConfig = {
  inject   : true,
  template : `${PATHS.app}/index.html`
}
const additionalHtmlPlugConfig = isProduction && {
  minify : {
    minifyJS                      : true,
    minifyCSS                     : true,
    minifyURLs                    : true,
    removeComments                : true,
    useShortDoctype               : true,
    keepClosingSlash              : true,
    collapseWhitespace            : true,
    removeEmptyAttributes         : true,
    removeRedundantAttributes     : true,
    removeStyleLinkTypeAttributes : true
  }
}
const htmlWebpackPlugin = new HtmlWebpackPlugin({
  ...defaultHtmlPlugConfig,
  ...additionalHtmlPlugConfig
})

const prodPlugin = new webpack.DefinePlugin({
  'process.env' : {
    NODE_ENV : JSON.stringify('production')
  }
})

const envInfo = new webpack.DefinePlugin({
  env : {
    isProduction,
    command       : JSON.stringify(LAUNCH_COMMAND),
    isDevelopment : LAUNCH_COMMAND === 'start'
  }
})

const manifestPlugin = new ManifestPlugin({
  fileName   : 'asset-manifest.json',
  publicPath : '/',
  generate   : (seed, files) => {
    const manifestFiles = files.reduce(function(manifest, file) {
      manifest[file.name] = file.path
      return manifest
    }, seed)

    return {
      files : manifestFiles
    }
  }
})

const miniCssExtractPlugin = new MiniCssExtractPlugin({
  // filename      : '[name].[hash:8].css',
  filename      : '[name].css',
  chunkFilename : '[id].[hash:8].css'
})

const HMRPlugin = new webpack.HotModuleReplacementPlugin() // Only for CSS
const ignorePlugin = new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/) // For momentjs
// ***************************************************

process.env.BABEL_ENV    = LAUNCH_COMMAND
process.env.LINT_ENV     = LAUNCH_COMMAND
process.env.isProduction = isProduction

const devPlugins = [ HMRPlugin ]
const commonPlugins = [
  caseSensitivePathPlugin,
  htmlWebpackPlugin,
  miniCssExtractPlugin,
  PnpWebpackPlugin,
  prodPlugin,
  envInfo
]
const prodPlugins = [ignorePlugin, manifestPlugin]

const prodEntry = [ PATHS.app, `${PATHS.styles}/main.css` ]
const devEntry = [ ...prodEntry, require.resolve('webpack-dev-server/client') + '?/' ]

const baseConfigs = {
  entry : isProduction ? prodEntry : devEntry,
  output : {
    filename   : '[name].[hash:8].bundle.js',
    path       : PATHS.build,
    publicPath : '/'
  },
  module : {
    strictExportPresence : true,
    rules : [
      { parser : { requireEnsure : false } },
      {
        enforce : 'pre',
        test    : /\.(js|jsx)$/,
        include : PATHS.app,
        options : { fix : true },
        loader  : 'eslint-loader',
        exclude : [/bundle\.js|coverage/, /node_modules/]
      },
      // {
        // oneOf : [
          {
            test    : /\.(js|jsx)$/,
            loader  : 'babel-loader',
            exclude : [/node_modules/]
          },
          {
            loader  : require.resolve('file-loader'),
            exclude : [/\.(js|mjs|jsx|ts|tsx)$/, /\.html$/, /\.json$/],
            options : {
              name : '[name].[hash:8].[ext]'
            }
          },
          {
            test : /\.css$/,
            exclude : [path.resolve(__dirname, 'coverage'), /node_modules/],
            loader : isProduction ? prodStyleConfig : devStyleConfig
          }
        // ]
      // }
    ]
  },
  resolve : {
    extensions : ['.js', '.jsx', '.css', '.json'],
    modules : [path.resolve('.'), 'node_modules'],
    alias : {
      $APP        : PATHS.app,
      $REDUX      : PATHS.redux,
      $BUILD      : PATHS.build,
      $CONFIGS    : PATHS.configs,
      $RUTILS     : PATHS.reduxUtils,
      $RMODULES   : PATHS.reduxModules,
      $CONTAINERS : PATHS.containers,
      $COMPONENTS : PATHS.components
    }
  },
  optimization : {
    minimize    : isProduction,
    minimizer   : [terserPlugin, optimizeCSSAssetsPlugin],
    splitChunks : {
      chunks : 'async',
      // chunks : 'all',
      name   : false,
      cacheGroups : {
        styles : {
          name    : 'styles',
          test    : /\.css$/,
          chunks  : 'all',
          enforce : true
        }
      }
    },
    runtimeChunk : true
  },
  resolveLoader : {
    plugins : [PnpWebpackPlugin.moduleLoader(module)]
  },
  node : {
    fs            : 'empty',
    dns           : 'mock',
    net           : 'empty',
    tls           : 'empty',
    dgram         : 'empty',
    http2         : 'empty',
    module        : 'empty',
    child_process : 'empty'
  }
}

const devConfigs = {
  devtool : 'cheap-module-source-map',
  plugins : [...commonPlugins, ...devPlugins],
  devServer : {
    hot                : true,
    open               : true,
    compress           : true,
    contentBase        : PATHS.build,
    watchContentBase   : true,
    clientLogLevel     : 'info',
    historyApiFallback : true,
    watchOptions : {
      ignored          : /node_modules/,
      aggregateTimeout : 800
    },
    overlay : {
      warnings : isProduction,
      errors   : true
    }
  }
}

const prodConfigs = {
  devtool : false,
  bail    : isProduction,
  plugins : [...commonPlugins, ...prodPlugins]
}

const mainConfig = isProduction
  ? {
      ...baseConfigs,
      ...prodConfigs
    }
  : {
      ...baseConfigs,
      ...devConfigs
    }

export default mainConfig