const webpack = require('webpack')
const config = require('sapper/webpack/config.js')
const UglifyJSPlugin = require('uglifyjs-webpack-plugin')
const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin
const LodashModuleReplacementPlugin = require('lodash-webpack-plugin')

const isDev = config.dev;

module.exports = {
	entry: config.client.entry(),
	output: config.client.output(),
	resolve: {
		extensions: ['.js', '.html']
	},
	module: {
		rules: [
			{
				test: /\.html$/,
				exclude: /node_modules/,
				use: {
					loader: 'svelte-loader',
					options: {
						hydratable: true,
						emitCss: !isDev,
						cascade: false,
						store: true
					}
				}
			},
			isDev && {
				test: /\.css$/,
				use: [
					{ loader: 'style-loader' },
					{ loader: 'css-loader' }
				]
			},
			!isDev && {
				test: /\.css$/,
				/* disable while https://github.com/sveltejs/sapper/issues/79 is open */
				/*use: ExtractTextPlugin.extract({
					fallback: 'style-loader',
					use: [{ loader: 'css-loader', options: { sourceMap:isDev } }]
				}) */
        use: [
          { loader: 'style-loader' },
          { loader: 'css-loader' }
        ]
			}
		].filter(Boolean)
	},
	plugins: [
		new webpack.optimize.CommonsChunkPlugin({
			minChunks: 2,
			async: false,
			children: true
		})
	].concat(isDev ? [
		new webpack.HotModuleReplacementPlugin()
	] : [
    new webpack.DefinePlugin({
			'process.browser': true,
			'process.env.NODE_ENV': '"production"'
    }),
		/* disable while https://github.com/sveltejs/sapper/issues/79 is open */
    //new ExtractTextPlugin('main.css'),
    new LodashModuleReplacementPlugin(),
		new webpack.optimize.ModuleConcatenationPlugin(),
		new UglifyJSPlugin(),
    new BundleAnalyzerPlugin({ // generates report.html and stats.json
      analyzerMode: 'static',
      generateStatsFile: true,
      statsOptions: {
        // allows usage with http://chrisbateman.github.io/webpack-visualizer/
        chunkModules: true,
      },
      openAnalyzer: false,
      logLevel: 'silent', // do not bother Webpacker, who runs with --json and parses stdout
    }),
	]).filter(Boolean),
	devtool: isDev && 'inline-source-map'
};