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

/*
 * Webpack Plugins
 */
// problem with copy-webpack-plugin
const AssetsPlugin = require('assets-webpack-plugin');
const NormalModuleReplacementPlugin = require('webpack/lib/NormalModuleReplacementPlugin');
const ContextReplacementPlugin = require('webpack/lib/ContextReplacementPlugin');
const CopyWebpackPlugin = require('copy-webpack-plugin');
const CheckerPlugin = require('awesome-typescript-loader').CheckerPlugin;
const HtmlElementsPlugin = require('./html-elements-plugin');
const ExtractTextPlugin = require('extract-text-webpack-plugin');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const LoaderOptionsPlugin = require('webpack/lib/LoaderOptionsPlugin');
const CommonsChunkPlugin = require('webpack/lib/optimize/CommonsChunkPlugin');
const ScriptExtHtmlWebpackPlugin = require('script-ext-html-webpack-plugin');
const ngcWebpack = require('ngc-webpack');


/*
 * Webpack Constants
 */
const HMR = helpers.hasProcessFlag('hot');
const AOT = helpers.hasNpmFlag('aot');
const METADATA = {
  title: 'ng2-admin - Angular 2 Admin Template',
  description: 'Free Angular 2 and Bootstrap 4 Admin Template',
  baseUrl: '/',
  isDevServer: helpers.isWebpackDevServer()
};

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

    /*
     * 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.browser.ts',
      'vendor': './src/vendor.browser.ts',
      'main':      AOT ? './src/main.browser.aot.ts' : './src/main.browser.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', '.css', '.scss', '.json'],

      // An array of directory names to be resolved to the current directory
      modules: [helpers.root('src'), helpers.root('node_modules')],

    },

    /*
     * Options affecting the normal modules.
     *
     * See: http://webpack.github.io/docs/configuration.html#module
     */
    module: {

      rules: [

        /*
         * Typescript loader support for .ts
         *
         * Component Template/Style integration using `angular2-template-loader`
         * Angular 2 lazy loading (async routes) via `ng-router-loader`
         *
         * `ng-router-loader` expects vanilla JavaScript code, not TypeScript code. This is why the
         * order of the loader matter.
         *
         * See: https://github.com/s-panferov/awesome-typescript-loader
         * See: https://github.com/TheLarkInn/angular2-template-loader
         * See: https://github.com/shlomiassaf/ng-router-loader
         */
        {
          test: /\.ts$/,
          use: [
            {
              loader: '@angularclass/hmr-loader',
              options: {
                pretty: !isProd,
                prod: isProd
              }
            },
            { // MAKE SURE TO CHAIN VANILLA JS CODE, I.E. TS COMPILATION OUTPUT.
              loader: 'ng-router-loader',
              options: {
                loader: 'async-import',
                genDir: 'compiled',
                aot: AOT
              }
            },
            {
              loader: 'awesome-typescript-loader',
              options: {
                configFileName: 'tsconfig.webpack.json'
              }
            },
            {
              loader: 'angular2-template-loader'
            }
          ],
          exclude: [/\.(spec|e2e)\.ts$/]
        },

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

        /*
         * to string and css loader support for *.css files (from Angular components)
         * Returns file content as string
         *
         */
        {
          test: /\.css$/,
          use: ['raw-loader']
        },

        {
          test: /\.scss$/,
          use: ['raw-loader', 'sass-loader']
        },

        {
          test: /initial\.scss$/,
          use: ExtractTextPlugin.extract({
            fallback: 'style-loader',
            use: 'css-loader!sass-loader?sourceMap'
          })
        },

        {
          test: /\.woff(2)?(\?v=.+)?$/,
          use: 'url-loader?limit=10000&mimetype=application/font-woff'
        },

        {
          test: /\.(ttf|eot|svg)(\?v=.+)?$/,
          use: 'file-loader'
        },

        {
          test: /bootstrap\/dist\/js\/umd\//,
          use: 'imports-loader?jQuery=jquery'
        },

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

        /* File loader for supporting images, for example, in CSS files.
         */
        {
          test: /\.(jpg|png|gif)$/,
          use: 'file-loader'
        }
      ]
    },

    /*
     * Add additional plugins to the compiler.
     *
     * See: http://webpack.github.io/docs/configuration.html#plugins
     */
    plugins: [
      new ExtractTextPlugin({filename: 'initial.css', allChunks: true}),

      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 CheckerPlugin(),
      /*
       * 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 CommonsChunkPlugin({
        name: 'polyfills',
        chunks: ['polyfills']
      }),
      // This enables tree shaking of the vendor modules
      new CommonsChunkPlugin({
        name: 'vendor',
        chunks: ['main'],
        minChunks: module => /node_modules/.test(module.resource)
      }),
      // Specify the correct order the scripts will be injected in
      new 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(\\|\/)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/ckeditor', to: 'ckeditor'},
        {from: 'src/meta'}
      ]),

      /*
       * 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',
        title: METADATA.title,
        chunksSortMode: 'dependency',
        metadata: METADATA,
        inject: 'head'
      }),

      /*
       * Plugin: ScriptExtHtmlWebpackPlugin
       * Description: Enhances html-webpack-plugin functionality
       * with different deployment options for your scripts including:
       *
       * See: https://github.com/numical/script-ext-html-webpack-plugin
       */
      new ScriptExtHtmlWebpackPlugin({
        defaultAttribute: 'defer'
      }),

      /*
       * Plugin: HtmlHeadConfigPlugin
       * Description: Generate html tags based on javascript maps.
       *
       * If a publicPath is set in the webpack output configuration, it will be automatically added to
       * href attributes, you can disable that by adding a "=href": false property.
       * You can also enable it to other attribute by settings "=attName": true.
       *
       * The configuration supplied is map between a location (key) and an element definition object (value)
       * The location (key) is then exported to the template under then htmlElements property in webpack configuration.
       *
       * Example:
       *  Adding this plugin configuration
       *  new HtmlElementsPlugin({
       *    headTags: { ... }
       *  })
       *
       *  Means we can use it in the template like this:
       *  <%= webpackConfig.htmlElements.headTags %>
       *
       * Dependencies: HtmlWebpackPlugin
       */
      new HtmlElementsPlugin({
        headTags: require('./head-config.common')
      }),

      /**
       * Plugin LoaderOptionsPlugin (experimental)
       *
       * See: https://gist.github.com/sokra/27b24881210b56bbaff7
       */
      new LoaderOptionsPlugin({}),

      new webpack.ProvidePlugin({
        $: "jquery",
        jQuery: "jquery",
        "window.jQuery": "jquery",
        Tether: "tether",
        "window.Tether": "tether",
        Tooltip: "exports-loader?Tooltip!bootstrap/js/dist/tooltip",
        Alert: "exports-loader?Alert!bootstrap/js/dist/alert",
        Button: "exports-loader?Button!bootstrap/js/dist/button",
        Carousel: "exports-loader?Carousel!bootstrap/js/dist/carousel",
        Collapse: "exports-loader?Collapse!bootstrap/js/dist/collapse",
        Dropdown: "exports-loader?Dropdown!bootstrap/js/dist/dropdown",
        Modal: "exports-loader?Modal!bootstrap/js/dist/modal",
        Popover: "exports-loader?Popover!bootstrap/js/dist/popover",
        Scrollspy: "exports-loader?Scrollspy!bootstrap/js/dist/scrollspy",
        Tab: "exports-loader?Tab!bootstrap/js/dist/tab",
        Util: "exports-loader?Util!bootstrap/js/dist/util"
      }),

      // Fix Angular 2
      new NormalModuleReplacementPlugin(
        /facade(\\|\/)async/,
        helpers.root('node_modules/@angular/core/src/facade/async.js')
      ),
      new NormalModuleReplacementPlugin(
        /facade(\\|\/)collection/,
        helpers.root('node_modules/@angular/core/src/facade/collection.js')
      ),
      new NormalModuleReplacementPlugin(
        /facade(\\|\/)errors/,
        helpers.root('node_modules/@angular/core/src/facade/errors.js')
      ),
      new NormalModuleReplacementPlugin(
        /facade(\\|\/)lang/,
        helpers.root('node_modules/@angular/core/src/facade/lang.js')
      ),
      new NormalModuleReplacementPlugin(
        /facade(\\|\/)math/,
        helpers.root('node_modules/@angular/core/src/facade/math.js')
      ),

      new ngcWebpack.NgcWebpackPlugin({
        disabled: !AOT,
        tsConfig: helpers.root('tsconfig.webpack.json'),
        resourceOverride: helpers.root('config/resource-override.js')
      })
    ],

    /*
     * 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: true,
      module: false,
      clearImmediate: false,
      setImmediate: false
    }

  };
}