/**
 * @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 DefinePlugin = require('webpack/lib/DefinePlugin')
const LoaderOptionsPlugin = require('webpack/lib/LoaderOptionsPlugin')
const NormalModuleReplacementPlugin = require('webpack/lib/NormalModuleReplacementPlugin')
const OptimizeJsPlugin = require('optimize-js-plugin')
const UglifyJsPlugin = require('webpack/lib/optimize/UglifyJsPlugin')
const HashedModuleIdsPlugin = require('webpack/lib/HashedModuleIdsPlugin')

/**
 * 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}), {
    /**
    * 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: '[file].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: '[name].[chunkhash].chunk.js',

      publicPath: '/client/'
    },

    externals: {
      webtorrent: 'WebTorrent'
    },

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

      /**
       * Webpack plugin to optimize a JavaScript file for faster initial load
       * by wrapping eagerly-invoked functions.
       *
       * See: https://github.com/vigneshshanmugam/optimize-js-plugin
       */

      new OptimizeJsPlugin({
        sourceMap: false
      }),

      /**
       * 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
        output: {
          comments: false
        }, // prod
        mangle: {
          screw_ie8: true
        }, // prod
        compress: {
          screw_ie8: true,
          warnings: false,
          conditionals: true,
          unused: true,
          comparisons: true,
          sequences: true,
          dead_code: true,
          evaluate: true,
          if_return: true,
          join_vars: true,
          negate_iife: false // we need this for lazy v8
        }
      }),

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

      new NormalModuleReplacementPlugin(
        /zone\.js(\\|\/)dist(\\|\/)long-stack-trace-zone/,
        helpers.root('config/empty.js')
      ),

      new HashedModuleIdsPlugin(),

      /**
      * Plugin: IgnorePlugin
      * Description: Don’t generate modules for requests matching the provided RegExp.
      *
      * See: http://webpack.github.io/docs/list-of-plugins.html#ignoreplugin
      */

      // new IgnorePlugin(/angular2-hmr/),

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

      /**
      * Plugin LoaderOptionsPlugin (experimental)
      *
      * See: https://gist.github.com/sokra/27b24881210b56bbaff7
      */
      new LoaderOptionsPlugin({
        minimize: true,
        debug: false,
        options: {

          /**
          * 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: [
              [/#/, /(?:)/],
              [/\*/, /(?:)/],
              [/\[?\(?/, /(?:)/]
            ],
            customAttrAssign: [/\)?]?=/]
          },

          // FIXME: Remove
          // https://github.com/bholloway/resolve-url-loader/issues/36
          // https://github.com/jtangelder/sass-loader/issues/289
          context: __dirname,
          output: {
            path: helpers.root('dist')
          }
        }
      })
    ],

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

  })
}