const webpack = require('webpack');
const path = require('path');
const fileSystem = require('fs-extra');
const { CleanWebpackPlugin } = require('clean-webpack-plugin');
const { VueLoaderPlugin } = require('vue-loader');
const CopyWebpackPlugin = require('copy-webpack-plugin');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const TerserPlugin = require('terser-webpack-plugin');
const env = require('./utils/env');

const ASSET_PATH = process.env.ASSET_PATH || '/';

const alias = {
  '@': path.resolve(__dirname, 'src/'),
};

// load the secrets
const secretsPath = path.join(__dirname, `secrets.${env.NODE_ENV}.js`);

const fileExtensions = [
  'jpg',
  'jpeg',
  'png',
  'gif',
  'eot',
  'otf',
  'svg',
  'ttf',
  'woff',
  'woff2',
];

if (fileSystem.existsSync(secretsPath)) {
  alias.secrets = secretsPath;
}

const options = {
  mode: process.env.NODE_ENV || 'development',
  entry: {
    newtab: path.join(__dirname, 'src', 'newtab', 'index.js'),
    popup: path.join(__dirname, 'src', 'popup', 'index.js'),
    background: path.join(__dirname, 'src', 'background', 'index.js'),
    contentScript: path.join(__dirname, 'src', 'content', 'index.js'),
    shortcut: path.join(__dirname, 'src', 'content', 'shortcut.js'),
  },
  chromeExtensionBoilerplate: {
    notHotReload: ['contentScript', 'shortcut'],
  },
  output: {
    path: path.resolve(__dirname, 'build'),
    filename: '[name].bundle.js',
    publicPath: ASSET_PATH,
  },
  module: {
    rules: [
      {
        test: /\.vue$/,
        loader: 'vue-loader',
      },
      {
        test: /\.css$/,
        use: [
          MiniCssExtractPlugin.loader,
          // {
          //   loader: 'style-loader',
          // },
          {
            loader: 'css-loader',
          },
          {
            loader: 'postcss-loader',
          },
        ],
      },
      {
        test: new RegExp(`.(${fileExtensions.join('|')})$`),
        loader: 'file-loader',
        type: 'javascript/auto',
        options: {
          name: '[name].[ext]',
        },
        exclude: /node_modules/,
      },
      {
        test: /\.js$/,
        use: [
          {
            loader: 'source-map-loader',
          },
          {
            loader: 'babel-loader',
          },
        ],
        exclude: /node_modules/,
      },
    ],
  },
  resolve: {
    alias,
    extensions: fileExtensions
      .map((extension) => `.${extension}`)
      .concat(['.js', '.vue', '.css']),
  },
  plugins: [
    new MiniCssExtractPlugin(),
    new VueLoaderPlugin(),
    new webpack.ProgressPlugin(),
    // clean the build folder
    new CleanWebpackPlugin({
      verbose: true,
      cleanStaleWebpackAssets: true,
    }),
    // expose and write the allowed env vars on the compiled bundle
    new webpack.EnvironmentPlugin(['NODE_ENV']),
    new CopyWebpackPlugin({
      patterns: [
        {
          from: 'src/manifest.json',
          to: path.join(__dirname, 'build'),
          force: true,
          transform(content) {
            // generates the manifest file using the package.json informations
            return Buffer.from(
              JSON.stringify({
                description: process.env.npm_package_description,
                version: process.env.npm_package_version,
                ...JSON.parse(content.toString()),
              })
            );
          },
        },
        {
          from: 'src/assets/images/icon-128.png',
          to: path.join(__dirname, 'build'),
          force: true,
        },
      ],
    }),
    new HtmlWebpackPlugin({
      template: path.join(__dirname, 'src', 'newtab', 'index.html'),
      filename: 'newtab.html',
      chunks: ['newtab'],
      cache: false,
    }),
    new HtmlWebpackPlugin({
      template: path.join(__dirname, 'src', 'popup', 'index.html'),
      filename: 'popup.html',
      chunks: ['popup'],
      cache: false,
    }),
    new webpack.DefinePlugin({
      __VUE_OPTIONS_API__: true,
      __VUE_PROD_DEVTOOLS__: false,
    }),
  ],
  infrastructureLogging: {
    level: 'info',
  },
};

if (env.NODE_ENV === 'development') {
  options.devtool = 'cheap-module-source-map';
} else {
  options.optimization = {
    minimize: true,
    minimizer: [
      new TerserPlugin({
        extractComments: false,
      }),
    ],
    // runtimeChunk: 'single',
    // splitChunks: {
    //   chunks: 'all',
    //   maxInitialRequests: Infinity,
    //   minSize: 0,
    //   cacheGroups: {
    //     vendor: {
    //       test: /[\\/]node_modules[\\/]/,
    //       name: 'vendor',
    //     },
    //   },
    // },
  };
}

module.exports = options;