const webpack = require('webpack');
const webpackMerge = require('webpack-merge');
const ExtractTextPlugin = require("extract-text-webpack-plugin");
const Visualizer = require('webpack-visualizer-plugin');
const UglifyJSPlugin = require('uglifyjs-webpack-plugin');
const WorkboxPlugin = require('workbox-webpack-plugin');
const AngularCompilerPlugin = require('@ngtools/webpack').AngularCompilerPlugin;
const path = require('path');

const utils = require('./utils.js');
const commonConfig = require('./webpack.common.js');

const ENV = 'production';
const extractCSS = new ExtractTextPlugin(`[name].[hash].css`);

module.exports = webpackMerge(commonConfig({env: ENV}), {
    // Enable source maps. Please note that this will slow down the build.
    // You have to enable it in UglifyJSPlugin config below and in tsconfig-aot.json as well
    // devtool: 'source-map',
    entry: {
        polyfills: './src/main/webapp/app/polyfills',
        global: './src/main/webapp/content/css/global.css',
        main: './src/main/webapp/app/app.main'
    },
    output: {
        path: utils.root('build/www'),
        filename: 'app/[name].[hash].bundle.js',
        chunkFilename: 'app/[id].[hash].chunk.js'
    },
    module: {
        rules: [{
            test: /(?:\.ngfactory\.js|\.ngstyle\.js|\.ts)$/,
            use: ['@ngtools/webpack']
        },
            {
                test: /\.css$/,
                loaders: ['to-string-loader', 'css-loader'],
                exclude: /(vendor\.css|global\.css)/
            },
            {
                test: /\.scss$/,
                loaders: ['style-loader', 'css-loader', 'sass-loader'],
                exclude: /(vendor\.css|global\.css)/
            },
            {
                test: /(vendor\.css|global\.css)/,
                use: extractCSS.extract({
                        fallback: 'style-loader',
                        use: ['css-loader']
                    },
                    {
                        test: /\.js$/,
                        loader: ["babel-loader"],
                        exclude: /node_modules/
                    })
            }]
    },
    plugins: [
        extractCSS,
        new Visualizer({
            // Webpack statistics in target folder
            filename: '../stats.html'
        }),
        new UglifyJSPlugin({
            parallel: true,
            uglifyOptions: {
                ie8: false,
                sourceMap: true, // Enable source maps. Please note that this will slow down the build
                compress: {
                    dead_code: true,
                    warnings: false,
                    properties: true,
                    drop_debugger: true,
                    conditionals: true,
                    booleans: true,
                    loops: true,
                    unused: true,
                    toplevel: true,
                    if_return: true,
                    inline: true,
                    join_vars: true
                },
                output: {
                    comments: false,
                    beautify: false,
                    indent_level: 2
                }
            }
        }),
        new AngularCompilerPlugin({
            mainPath: utils.root('src/main/webapp/app/app.main.ts'),
            tsConfigPath: utils.root('tsconfig-aot.json'),
            sourceMap: true
        }),
        new webpack.LoaderOptionsPlugin({
            minimize: true,
            debug: false
        }),
        new WorkboxPlugin.GenerateSW({
            clientsClaim: true,
            skipWaiting: true,
        })
    ]
});
