/* eslint-env node */
const { merge } = require('webpack-merge'),
CopyPlugin = require('copy-webpack-plugin'),
path = require('path'),
TerserPlugin = require('terser-webpack-plugin'),
webpack = require('webpack'),
file = (dir) => path.resolve(path.resolve(__dirname, '..'),dir);
module.exports = (env,args) => {
  let brws = env.brws,
  plugins = [
    new webpack.optimize.LimitChunkCountPlugin({ maxChunks: 1 }),
    new CopyPlugin({
      patterns: [
        {
          from: file(`src/manifest/${brws}.json`),
          to: file(`tests/${brws}/manifest.json`),
          transform(content) {
            const { version, description, author, homepage: homepage_url } = require('../package.json');
            const manifest = JSON.parse(content);
            return JSON.stringify(Object.assign(manifest, {
              version,
              description,
              author,
              homepage_url
            }),null,' ');
          },
        },
        {
          from: file('src/_locales'),
          to: file(`tests/${brws}/_locales`),
        },
        {
          from: file('src/html'),
          to: file(`tests/${brws}`),
        },
        {
          from: file('tests/compiled'),
          to: file(`tests/${brws}/css`),
          force: true,
        },
        {
          from: file('src/img'),
          to: file(`tests/${brws}/img`),
        },
        {
          from: file('src/web_accessible_resources'),
          to: file(`tests/${brws}/web_accessible_resources`),
          // force: true,
        },
        {
          from: file('src/js'),
          to: file(`tests/${brws}/js`),
          // force: true,
        },
        {
          from: file('src/sass/fonts'),
          to: file(`tests/${brws}/css/fonts`),
        },
      ],
    }),
  ],
  commonConfig = {
    context: file('src'),
    entry: {
      start: './js/start.js',
    },
    output: {
      path: file(`tests/${brws}/js`),
      filename: '[name].js',
    },
    module: {
      rules: [
        {
          test: /\.m?js$/,
          exclude: /(node_modules|bower_components)/,
          use: {
            loader: 'swc-loader',
            options: {
              sync: true,
              jsc: {
                parser: {
                  syntax: 'ecmascript'
                },
                target: 'es2020',
              },
              module: {
                type: 'es6',
              },
            },
          },
        },
      ],
    },
    resolve: {
      extensions: ['.js'],
      fallback: {
        'path': require.resolve('path-browserify')
      }
    },
    plugins,
    // experiments: {topLevelAwait: true,},
  },
  productionConfig = {
    mode: 'production',
    optimization: {
      minimize: true,
      minimizer: [
      new TerserPlugin({
        // test: /\.m?js$/,
        // minify: TerserPlugin.swcMinify,
        terserOptions: {
          format: {
            comments: false,
          },
        },
        extractComments: false,
        parallel: true,
      })],
    },
  },
  developmentConfig = {
    mode: 'development',
    devtool: 'source-map',
    optimization: {
      minimize: false
    },
    watch: true,
    watchOptions: {
      poll: 1000,
      aggregateTimeout: 500,
      ignored: /(node_modules|bower_components)/,
    },
  };
  switch(args.mode) {
    case 'development':
      return merge(commonConfig, developmentConfig);
    case 'production':
      return merge(commonConfig, productionConfig);
    default:
      throw new Error('No matching configuration was found!');
  }
};