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 NamedModulesPlugin = require('webpack/lib/NamedModulesPlugin')

/**
 * Webpack Constants
 */
const ENV = process.env.ENV = process.env.NODE_ENV = 'development'
const HOST = process.env.HOST || 'localhost'
const PORT = process.env.PORT || 3000
const HMR = helpers.hasProcessFlag('hot')
const METADATA = webpackMerge(commonConfig({env: ENV}).metadata, {
  host: HOST,
  port: PORT,
  ENV: ENV,
  HMR: HMR
})

/**
 * Webpack configuration
 *
 * See: http://webpack.github.io/docs/configuration.html#cli
 */
module.exports = webpackMerge(commonConfig({env: ENV}), {
  /**
   * Merged metadata from webpack.common.js for index.html
   *
   * See: (custom attribute)
   */
  metadata: METADATA,

  /**
   * Switch loaders to debug mode.
   *
   * See: http://webpack.github.io/docs/configuration.html#debug
   */
  debug: true,

  /**
   * 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: 'cheap-module-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].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].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].chunk.js',

    library: 'ac_[name]',
    libraryTarget: 'var'

  },

  externals: {
    webtorrent: 'WebTorrent'
  },

  plugins: [

    /**
     * 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
      }
    }),

    new NamedModulesPlugin()
  ],

  /**
   * 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: false,
    failOnHint: false,
    resourcePath: 'src'
  },

  devServer: {
    port: METADATA.port,
    host: METADATA.host,
    historyApiFallback: true,
    watchOptions: {
      aggregateTimeout: 300,
      poll: 1000
    },
    outputPath: 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: 'window',
    crypto: 'empty',
    process: true,
    module: false,
    clearImmediate: false,
    setImmediate: false
  }

})