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/**
 * @author: @AngularClass
 */

const helpers = require('./helpers')
const webpackMerge = require('webpack-merge') // used to merge webpack configs
const commonConfig = require('./webpack.common.js') // the settings that are common to prod and dev

/**
 * Webpack Plugins
 */
// const ProvidePlugin = require('webpack/lib/ProvidePlugin')
const DefinePlugin = require('webpack/lib/DefinePlugin')
const NormalModuleReplacementPlugin = require('webpack/lib/NormalModuleReplacementPlugin')
// const IgnorePlugin = require('webpack/lib/IgnorePlugin')
// const DedupePlugin = require('webpack/lib/optimize/DedupePlugin')
const UglifyJsPlugin = require('webpack/lib/optimize/UglifyJsPlugin')
const WebpackMd5Hash = require('webpack-md5-hash')

/**
 * Webpack Constants
 */
const ENV = process.env.NODE_ENV = process.env.ENV = 'production'
const HOST = process.env.HOST || 'localhost'
const PORT = process.env.PORT || 8080
const METADATA = webpackMerge(commonConfig({env: ENV}).metadata, {
  host: HOST,
  port: PORT,
  ENV: ENV,
  HMR: false
})

module.exports = function (env) {
  return webpackMerge(commonConfig({env: ENV}), {
    /**
     * Switch loaders to debug mode.
     *
     * See: http://webpack.github.io/docs/configuration.html#debug
     */
    debug: false,

    /**
     * Developer tool to enhance debugging
     *
     * See: http://webpack.github.io/docs/configuration.html#devtool
     * See: https://github.com/webpack/docs/wiki/build-performance#sourcemaps
     */
    devtool: 'source-map',

    /**
     * Options affecting the output of the compilation.
     *
     * See: http://webpack.github.io/docs/configuration.html#output
     */
    output: {
      /**
       * The output directory as absolute path (required).
       *
       * See: http://webpack.github.io/docs/configuration.html#output-path
       */
      path: helpers.root('dist'),

      /**
       * Specifies the name of each output file on disk.
       * IMPORTANT: You must not specify an absolute path here!
       *
       * See: http://webpack.github.io/docs/configuration.html#output-filename
       */
      filename: '[name].[chunkhash].bundle.js',

      /**
       * The filename of the SourceMaps for the JavaScript files.
       * They are inside the output.path directory.
       *
       * See: http://webpack.github.io/docs/configuration.html#output-sourcemapfilename
       */
      sourceMapFilename: '[name].[chunkhash].bundle.map',

      /**
       * The filename of non-entry chunks as relative path
       * inside the output.path directory.
       *
       * See: http://webpack.github.io/docs/configuration.html#output-chunkfilename
       */
      chunkFilename: '[id].[chunkhash].chunk.js'

    },

    externals: {
      webtorrent: 'WebTorrent'
    },

    /**
     * Add additional plugins to the compiler.
     *
     * See: http://webpack.github.io/docs/configuration.html#plugins
     */
    plugins: [

      /**
       * Plugin: WebpackMd5Hash
       * Description: Plugin to replace a standard webpack chunkhash with md5.
       *
       * See: https://www.npmjs.com/package/webpack-md5-hash
       */
      new WebpackMd5Hash(),

      /**
       * Plugin: DedupePlugin
       * Description: Prevents the inclusion of duplicate code into your bundle
       * and instead applies a copy of the function at runtime.
       *
       * See: https://webpack.github.io/docs/list-of-plugins.html#defineplugin
       * See: https://github.com/webpack/docs/wiki/optimization#deduplication
       */
      // new DedupePlugin(),

      /**
       * Plugin: DefinePlugin
       * Description: Define free variables.
       * Useful for having development builds with debug logging or adding global constants.
       *
       * Environment helpers
       *
       * See: https://webpack.github.io/docs/list-of-plugins.html#defineplugin
       */
      // NOTE: when adding more properties make sure you include them in custom-typings.d.ts
      new DefinePlugin({
        'ENV': JSON.stringify(METADATA.ENV),
        'HMR': METADATA.HMR,
        'process.env': {
          'ENV': JSON.stringify(METADATA.ENV),
          'NODE_ENV': JSON.stringify(METADATA.ENV),
          'HMR': METADATA.HMR
        }
      }),

      /**
       * Plugin: UglifyJsPlugin
       * Description: Minimize all JavaScript output of chunks.
       * Loaders are switched into minimizing mode.
       *
       * See: https://webpack.github.io/docs/list-of-plugins.html#uglifyjsplugin
       */
      // NOTE: To debug prod builds uncomment //debug lines and comment //prod lines
      new UglifyJsPlugin({
        // beautify: true, //debug
        // mangle: false, //debug
        // dead_code: false, //debug
        // unused: false, //debug
        // deadCode: false, //debug
        // compress: {
        //   screw_ie8: true,
        //   keep_fnames: true,
        //   drop_debugger: false,
        //   dead_code: false,
        //   unused: false
        // }, // debug
        // comments: true, //debug

        beautify: false, // prod
        mangle: { screw_ie8: true, keep_fnames: true }, // prod
        compress: { screw_ie8: true }, // prod
        comments: false // prod
      }),

      new NormalModuleReplacementPlugin(
        /angular2-hmr/,
        helpers.root('config/modules/angular2-hmr-prod.js')
      )

      /**
       * Plugin: CompressionPlugin
       * Description: Prepares compressed versions of assets to serve
       * them with Content-Encoding
       *
       * See: https://github.com/webpack/compression-webpack-plugin
       */
      // new CompressionPlugin({
      //   regExp: /\.css$|\.html$|\.js$|\.map$/,
      //   threshold: 2 * 1024
      // })

    ],

    /**
     * Static analysis linter for TypeScript advanced options configuration
     * Description: An extensible linter for the TypeScript language.
     *
     * See: https://github.com/wbuchwalter/tslint-loader
     */
    tslint: {
      emitErrors: true,
      failOnHint: true,
      resourcePath: 'src'
    },

    /**
     * Html loader advanced options
     *
     * See: https://github.com/webpack/html-loader#advanced-options
     */
    // TODO: Need to workaround Angular 2's html syntax => #id [bind] (event) *ngFor
    htmlLoader: {
      minimize: true,
      removeAttributeQuotes: false,
      caseSensitive: true,
      customAttrSurround: [
        [/#/, /(?:)/],
        [/\*/, /(?:)/],
        [/\[?\(?/, /(?:)/]
      ],
      customAttrAssign: [/\)?\]?=/]
    },

    /*
     * Include polyfills or mocks for various node stuff
     * Description: Node configuration
     *
     * See: https://webpack.github.io/docs/configuration.html#node
     */
    node: {
      global: 'window',
      crypto: 'empty',
      process: false,
      module: false,
      clearImmediate: false,
      setImmediate: false
    }

  })
}