/* eslint-env node */

const ExtractTextPlugin = require('extract-text-webpack-plugin');
const HtmlWebpackPlugin = require('html-webpack-plugin');

const _ = require('lodash');
const path = require('path');
const webpack = require('webpack');

const __DEV__ = process.env.NODE_ENV !== 'production';

function getClientEnvironment() {
  const allowedKeys = [
    'API_ENV',
    'NODE_ENV',
    'DISABLED_MONITORS',
    'MESSENGER_RECIPIENT'
  ];

  const env = Object.assign(
    {},
    require('./config/api-env'),
    _.pick(process.env, allowedKeys)
  );

  return {
    'process.env': _.mapValues(env, envValue => JSON.stringify(envValue))
  };
}

const config = {
  cache: true,
  context: path.join(__dirname, 'src'),
  entry: {
    app: './index.js'
  },
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: __DEV__ ? 'main.js' : 'main.[hash].js'
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        use: ['babel-loader?cacheDirectory'],
        include: [
          path.resolve(__dirname, 'src'),
          path.resolve(__dirname, 'node_modules/angular-common-auth')
        ]
      },
      {
        test: /\.html$/,
        loader: 'html-loader'
      },
      {
        test: /\.css$/,
        loader: ExtractTextPlugin.extract({
          fallback: 'style-loader',
          use: 'css-loader'
        })
      },
      {
        test: /\.(eot|svg|ttf|woff|woff2)$/,
        loader: 'file-loader?name=assets/fonts/[name].[ext]'
      },
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        loader: 'file-loader?name=assets/img/[name].[ext]'
      }
    ]
  },

  resolve: {
    modules: [path.join(__dirname, 'src'), 'node_modules'],
    alias: {
      components: path.resolve(__dirname, 'src/components'),
      enums: path.resolve(__dirname, 'src/enums'),
      libs: path.resolve(__dirname, 'src/libs')
    }
  },

  devtool: __DEV__ ? 'cheap-source-map' : 'source-map',
  stats: 'errors-only',

  devServer: {
    contentBase: path.join(__dirname, 'dist'),
    port: 3000,
    overlay: true,
    inline: false,
    stats: {
      children: false,
      assets: false
    }
  },

  plugins: [
    new webpack.PrefetchPlugin(
      path.join(__dirname, 'src'),
      'ng-components/index.js'
    ),

    new ExtractTextPlugin({
      filename: __DEV__ ? 'main.css' : 'main.[hash].css',
      allChunks: true
    }),

    new webpack.DefinePlugin(getClientEnvironment()),

    new HtmlWebpackPlugin({
      template: './index.html',
      favicon: './assets/img/favicon.png'
    })
  ]
};

if (!__DEV__) {
  // add angular injection annotation to js files
  config.module.rules[0].use.unshift('ng-annotate-loader');
  // optimise minimise js
  config.plugins.push(
    new webpack.LoaderOptionsPlugin({
      // https://webpack.js.org/guides/migrating/#uglifyjsplugin-minimize-loaders
      minimize: true
    }),
    new webpack.optimize.UglifyJsPlugin({
      sourceMap: true
    }),
    new webpack.optimize.OccurrenceOrderPlugin()
  );
}

module.exports = config;