const webpack = require('webpack')
const helpers = require('./helpers')

/*
 * Webpack Plugins
 */

const CopyWebpackPlugin = require('copy-webpack-plugin')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const ForkCheckerPlugin = require('awesome-typescript-loader').ForkCheckerPlugin
const AssetsPlugin = require('assets-webpack-plugin')
const ContextReplacementPlugin = require('webpack/lib/ContextReplacementPlugin')
const WebpackNotifierPlugin = require('webpack-notifier')

/*
 * Webpack Constants
 */
const METADATA = {
  title: 'PeerTube',
  baseUrl: '/',
  isDevServer: helpers.isWebpackDevServer()
}

/*
 * Webpack configuration
 *
 * See: http://webpack.github.io/docs/configuration.html#cli
 */
module.exports = function (options) {
  var isProd = options.env === 'production'

  return {
    /*
     * Static metadata for index.html
     *
     * See: (custom attribute)
     */
    metadata: METADATA,

    /*
     * Cache generated modules and chunks to improve performance for multiple incremental builds.
     * This is enabled by default in watch mode.
     * You can pass false to disable it.
     *
     * See: http://webpack.github.io/docs/configuration.html#cache
     */
    // cache: false,

    /*
     * The entry point for the bundle
     * Our Angular.js app
     *
     * See: http://webpack.github.io/docs/configuration.html#entry
     */
    entry: {
      'polyfills': './src/polyfills.ts',
      'vendor': './src/vendor.ts',
      'main': './src/main.ts'
    },

    /*
     * Options affecting the resolving of modules.
     *
     * See: http://webpack.github.io/docs/configuration.html#resolve
     */
    resolve: {
      /*
       * An array of extensions that should be used to resolve modules.
       *
       * See: http://webpack.github.io/docs/configuration.html#resolve-extensions
       */
      extensions: [ '', '.ts', '.js', '.scss' ],

      // Make sure root is src
      root: helpers.root('src'),

      // remove other default values
      modulesDirectories: [ 'node_modules' ]
    },

    output: {
      publicPath: '/client/'
    },

    /*
     * Options affecting the normal modules.
     *
     * See: http://webpack.github.io/docs/configuration.html#module
     */
    module: {
      /*
       * An array of applied pre and post loaders.
       *
       * See: http://webpack.github.io/docs/configuration.html#module-preloaders-module-postloaders
       */
      preLoaders: [
        {
          test: /\.ts$/,
          loader: 'string-replace-loader',
          query: {
            search: '(System|SystemJS)(.*[\\n\\r]\\s*\\.|\\.)import\\((.+)\\)',
            replace: '$1.import($3).then(mod => (mod.__esModule && mod.default) ? mod.default : mod)',
            flags: 'g'
          },
          include: [helpers.root('src')]
        }
      ],

      /*
       * An array of automatically applied loaders.
       *
       * IMPORTANT: The loaders here are resolved relative to the resource which they are applied to.
       * This means they are not resolved relative to the configuration file.
       *
       * See: http://webpack.github.io/docs/configuration.html#module-loaders
       */
      loaders: [

        /*
         * Typescript loader support for .ts and Angular 2 async routes via .async.ts
         *
         * See: https://github.com/s-panferov/awesome-typescript-loader
         */
        {
          test: /\.ts$/,
          loaders: [
            '@angularclass/hmr-loader?pretty=' + !isProd + '&prod=' + isProd,
            'awesome-typescript-loader',
            'angular2-template-loader'
          ],
          exclude: [/\.(spec|e2e)\.ts$/]
        },

        /*
         * Json loader support for *.json files.
         *
         * See: https://github.com/webpack/json-loader
         */
        {
          test: /\.json$/,
          loader: 'json-loader'
        },

        {
          test: /\.(sass|scss)$/,
          loaders: ['css-to-string-loader', 'css-loader?sourceMap', 'resolve-url', 'sass-loader?sourceMap']
        },
        { test: /\.woff(2)?(\?v=[0-9]\.[0-9]\.[0-9])?$/, loader: 'url?limit=10000&minetype=application/font-woff' },
        { test: /\.(ttf|eot|svg)(\?v=[0-9]\.[0-9]\.[0-9])?$/, loader: 'file' },

        /* Raw loader support for *.html
         * Returns file content as string
         *
         * See: https://github.com/webpack/raw-loader
         */
        {
          test: /\.html$/,
          loader: 'raw-loader',
          exclude: [ helpers.root('src/index.html') ]
        }

      ]

    },

    sassLoader: {
      precision: 10
    },

    /*
     * Add additional plugins to the compiler.
     *
     * See: http://webpack.github.io/docs/configuration.html#plugins
     */
    plugins: [
      new AssetsPlugin({
        path: helpers.root('dist'),
        filename: 'webpack-assets.json',
        prettyPrint: true
      }),

      /*
       * Plugin: ForkCheckerPlugin
       * Description: Do type checking in a separate process, so webpack don't need to wait.
       *
       * See: https://github.com/s-panferov/awesome-typescript-loader#forkchecker-boolean-defaultfalse
       */
      new ForkCheckerPlugin(),

      /*
       * Plugin: CommonsChunkPlugin
       * Description: Shares common code between the pages.
       * It identifies common modules and put them into a commons chunk.
       *
       * See: https://webpack.github.io/docs/list-of-plugins.html#commonschunkplugin
       * See: https://github.com/webpack/docs/wiki/optimization#multi-page-app
       */
      new webpack.optimize.CommonsChunkPlugin({
        name: [ 'polyfills', 'vendor' ].reverse()
      }),

      /**
       * Plugin: ContextReplacementPlugin
       * Description: Provides context to Angular's use of System.import
       *
       * See: https://webpack.github.io/docs/list-of-plugins.html#contextreplacementplugin
       * See: https://github.com/angular/angular/issues/11580
      */
      new ContextReplacementPlugin(
        // The (\\|\/) piece accounts for path separators in *nix and Windows
        /angular(\\|\/)core(\\|\/)(esm(\\|\/)src|src)(\\|\/)linker/,
        helpers.root('src') // location of your src
      ),

      /*
       * Plugin: CopyWebpackPlugin
       * Description: Copy files and directories in webpack.
       *
       * Copies project static assets.
       *
       * See: https://www.npmjs.com/package/copy-webpack-plugin
       */
      new CopyWebpackPlugin([
        {
          from: 'src/assets',
          to: 'assets'
        },
        {
          from: 'node_modules/webtorrent/webtorrent.min.js',
          to: 'assets/webtorrent'
        }
      ]),

      /*
       * Plugin: HtmlWebpackPlugin
       * Description: Simplifies creation of HTML files to serve your webpack bundles.
       * This is especially useful for webpack bundles that include a hash in the filename
       * which changes every compilation.
       *
       * See: https://github.com/ampedandwired/html-webpack-plugin
       */
      new HtmlWebpackPlugin({
        template: 'src/index.html',
        chunksSortMode: 'dependency'
      }),

      new WebpackNotifierPlugin({ alwaysNotify: true })
    ],

    /*
     * 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',
      fs: 'empty',
      events: true,
      module: false,
      clearImmediate: false,
      setImmediate: false
    }
  }
}