/**
 * Build for production:
 * $ NODE_ENV=production webpack
 * 
 * Build for staging or development mode
 * $ webpack
 * 
 * Run app server in dev mode and use Hot Module Replacement
 * $ NODE_ENV=webpack nodemon --watch ./app index.js
 * 
 */
 
var webpack = require('webpack');
var autoprefixer = require('autoprefixer-core');


function isProduction() {
	return process.env.NODE_ENV == 'production';
}

function isWebpack() {
	return process.env.NODE_ENV == 'webpack';
}

function addHotEntries(base) {
	var entries = [];
	if (isWebpack()) {
		entries.push('webpack/hot/dev-server', 'webpack-hot-middleware/client');
	}
	entries.push(base);
	return entries;
}


module.exports = {

	entry: {
		'main': addHotEntries('./public/js/main.js')
	},

	output: {
		path: require('path').resolve('./public/_/'),
		publicPath: '/assets/',
		filename: '[name].js',
		// it’s useful to have static filenames in development mode and hash-based in production
		chunkFilename: isProduction() ? '[chunkhash].chunk.js' : '[id].chunk.js'
	},

	module: {
		loaders: (function () {
			var list = [];

			if (isWebpack()) {
				// add react hot loader only to jsx files
				list.push({ test: /\.jsx$/, loader: 'react-hot' });
			}

			list.push([
				// any js run through babel
				{ test: /\.jsx?$/, exclude: /node_modules/, loader: 'babel-loader?stage=0' },
				// load css as is
				{ test: /\.css$/, loader: 'style-loader!css-loader?-minimize' },
				// process less files using postcss plugins
				{ test: /\.less$/, loader: 'style-loader!css-loader?-minimize!postcss-loader!less-loader' },
				// load external assets as files. use url-loader to embed them into styles
				{ test: /\.(eot|ttf|woff|woff2|svg|png|jpg|jpeg)$/, loader: 'file-loader' }
			]);

			return list;

		})()
	},

	postcss: function () {
		return [autoprefixer]
	},

	plugins: (function () {
		var plugins = [];

		plugins.push(
			new webpack.DefinePlugin({
				// nice to have environment mode as JS variable
				'process.env.NODE_ENV': '"' + process.env.NODE_ENV + '"'
			})
		);

		if (isWebpack()) {
			plugins.push(
				new webpack.optimize.OccurenceOrderPlugin(),
				new webpack.HotModuleReplacementPlugin(),
				new webpack.NoErrorsPlugin()
			);
		}

		if (isProduction()) {
			plugins.push(
				new webpack.optimize.DedupePlugin(),
				new webpack.optimize.UglifyJsPlugin({
					compress: {
						warnings: false
					}
				})
			);
		}

		return plugins;
	}())

};