'use strict';

const glob = require('glob');
const path = require('path');
const webpack = require('webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const CleanWebpackPlugin = require('clean-webpack-plugin');
const FriendlyErrorsWebpackPlugin = require('friendly-errors-webpack-plugin');

const setMPA = () => {
    const entry = {};
    const htmlWebpackPlugins = [];
    const entryFiles = glob.sync(path.join(__dirname, './src/*/index.js'));

    Object.keys(entryFiles)
        .map((index) => {
            const entryFile = entryFiles[index];
            // '/Users/cpselvis/my-project/src/index/index.js'

            const match = entryFile.match(/src\/(.*)\/index\.js/);
            const pageName = match && match[1];

            entry[pageName] = entryFile;
            htmlWebpackPlugins.push(
                new HtmlWebpackPlugin({
                    template: path.join(__dirname, `src/${pageName}/index.html`),
                    filename: `${pageName}.html`,
                    chunks: [pageName],
                    inject: true,
                    minify: {
                        html5: true,
                        collapseWhitespace: true,
                        preserveLineBreaks: false,
                        minifyCSS: true,
                        minifyJS: true,
                        removeComments: false
                    }
                })
            );
        });

    return {
        entry,
        htmlWebpackPlugins
    }
}

const { entry, htmlWebpackPlugins } = setMPA();

module.exports = {
    entry: entry,
    output: {
        path: path.join(__dirname, 'dist'),
        filename: '[name].js'
    },
    mode: 'development',
    module: {
        rules: [
            {
                test: /.js$/,
                use: 'babel-loader'
            },
            {
                test: /.css$/,
                use: [
                    'style-loader',
                    'css-loader'
                ]
            },
            {
                test: /.less$/,
                use: [
                    'style-loader',
                    'css-loader',
                    'less-loader'
                ]
            },
            {
                test: /.(png|jpg|gif|jpeg)$/,
                use: [
                    {
                        loader: 'url-loader',
                        options: {
                            limit: 10240
                        }
                    }
                ]
            },
            {
                test: /.(woff|woff2|eot|ttf|otf)$/,
                use: 'file-loader'
            }
        ]
    },
    plugins: [
        new webpack.HotModuleReplacementPlugin(),
        new CleanWebpackPlugin(),
        new FriendlyErrorsWebpackPlugin()
    ].concat(htmlWebpackPlugins),
    devServer: {
        contentBase: './dist',
        hot: true,
        stats: 'errors-only'
    },
    devtool: 'cheap-source-map'
};