const webpack = require("webpack");
const path = require("path");

const CleanupPlugin = require("clean-webpack-plugin");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const ExtractTextPlugin = require("extract-text-webpack-plugin");
const autoprefixer = require("autoprefixer");

const nodeEnv = process.env.NODE_ENV || "development";

const plugins = [
	new webpack.optimize.CommonsChunkPlugin({
		name: "commons",
		filename: "[name]-[hash].js",
		chunks: ["vendor", "app"]
	}),
	new HtmlWebpackPlugin({
		hash: true,
		chunks: ["commons", "app"],
		template: "index.tpl.html",
		inject: "body",
		filename: "index.html"
	}),
	new webpack.optimize.OccurrenceOrderPlugin(),
	new webpack.HotModuleReplacementPlugin(),
	new webpack.NoEmitOnErrorsPlugin(),
	new webpack.DefinePlugin({
		"process.env": {
			NODE_ENV: JSON.stringify(nodeEnv),
		},
	}),
	new webpack.NamedModulesPlugin(),
	new CleanupPlugin(["dist"], {
		verbose: true,
		dry: true,
		watch: true,
	}),
	new webpack.LoaderOptionsPlugin({
		options: {
			postcss: [
				autoprefixer({
					browsers: [
						"last 3 version",
						"ie >= 10",
					],
				}),
			],
			context: path.join(__dirname, "./app"),
		},
	}),
];

const rules = [
	{
		test: /\.(js|jsx)$/,
		exclude: /node_modules/,
		use: [
			"babel-loader",
		],
	},
	{
		test: /\.(png|gif|jpg|svg)$/,
		include: path.join(__dirname, "./app/assets/images"),
		use: "url-loader?limit=20480&name=assets/[name]-[hash].[ext]",
	},
];

if (nodeEnv === "production") {
	plugins.push(
		new webpack.LoaderOptionsPlugin({
			minimize: true,
			debug: false,
		}),
		new webpack.optimize.UglifyJsPlugin({
			compress: {
				warnings: false,
				screw_ie8: true,
				conditionals: true,
				unused: true,
				comparisons: true,
				sequences: true,
				dead_code: true,
				evaluate: true,
				if_return: true,
				join_vars: true,
			},
			output: {
				comments: false,
			},
		}),
		new ExtractTextPlugin("style-[hash].css")
	);

	rules.push({
		test: /\.scss$/,
		loader: ExtractTextPlugin.extract({
			fallback: "style-loader",
			use: "css-loader!postcss-loader!sass-loader",
		}),
	});
} else {
	rules.push({
		test: /\.scss$/,
		exclude: /node_modules/,
		use: [
			"style-loader",
			// "css-loader?sourceMap",
			"css-loader",
			"postcss-loader",
			"sass-loader?sourceMap",
		],
	});
}

module.exports = {
	devtool: nodeEnv === "production" ? "eval" : "source-map",
	context: path.join(__dirname, "./app"),
	entry: {
		app: "./js/index.js",
		vendor: [
			"babel-polyfill",
			"es6-promise",
			"immutable",
			"isomorphic-fetch",
			"react-dom",
			"react-redux",
			"react-router-dom",
			"react",
			"redux-thunk",
			"redux",
		],
	},
	output: {
		path: path.join(__dirname, "./dist"),
		publicPath: "/",
		filename: "[name]-[hash].js",
	},
	module: {
		rules,
	},
	resolve: {
		extensions: [".webpack-loader.js", ".web-loader.js", ".loader.js", ".js", ".jsx"],
		modules: [
			path.resolve(__dirname, "node_modules"),
			path.resolve(__dirname, "./app/js"),
			path.resolve(__dirname, "./"),
		],
	},
	plugins,
};