const path = require('path');
const webpack = require('webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const CleanWebpackPlugin = require('clean-webpack-plugin');

const entryList = {
  dashboard: './src/dashboard/index.js',
  style: './src/styles/index.scss',
  login_style: './src/styles/login.scss',
  order_detail: './src/detail-display/index.js',
  sku: './src/sku/index.js',
  mini_program_management: './src/mini-program-management/index.js',
  spread: './src/spread/index.js',
  sku_item: './src/sku-item/index.js',
  'custom-menu': './src/custom-menu/index.js',
  sku_for_activity: './src/sku-for-activity/index.js',
};

const needIconfontEntries = ['style', 'login_style'];

module.exports = function (env, argv) {
  const pathToClean = argv.module ? `${argv.module}.*.js` : 'custom';
  const entry = argv.module ? {[argv.module]: entryList[argv.module]} : entryList;
  const htmlWebpackPluginList = Object.keys(entry).map(entryItem => new HtmlWebpackPlugin({
    filename: `${entryItem}.html`,
    chunks: [entryItem],
    template: needIconfontEntries.includes(entryItem) ? 'src/iconfont.html' : 'src/import.html'
  }));

  return {
    entry,
    output: {
      filename: '[name].[chunkhash].js',
      path: path.resolve(__dirname, 'custom'),
      publicPath: '/custom/'
    },
    module: {
      rules: [
        {
          test: /\.js$/,
          exclude: /(node_modules|bower_components)/,
          use: {
            loader: 'babel-loader'
          }
        },
        {
          test: /\.scss$/,
          use: ["style-loader", "css-loader", "resolve-url-loader", "sass-loader?sourceMap",
            {
              loader: 'sass-resources-loader',
              options: {
                resources: './src/styles/variables.scss'
              }
            }]
        },
        {
          test: /\.css$/,
          use: ["style-loader", "css-loader"]
        },
        {
          test: /\.(png|jpg|gif|eot|svg|ttf|woff2?)(\?.*)?$/i,
          use: [
            {
              loader: 'url-loader',
              options: {
                limit: 10000
              }
            },
            'file-loader'
          ]
        }
      ]
    },
    plugins: [
      new CleanWebpackPlugin({
        cleanOnceBeforeBuildPatterns: [pathToClean]
      }),
      new webpack.DefinePlugin({
        ENV_DEV: JSON.stringify(argv.mode === 'development')
      }),
      ...htmlWebpackPluginList,
    ]
  };
};