import webpack from 'webpack';
import { fileURLToPath } from 'url';
import path, { dirname } from 'path';
import fileSystem from 'fs-extra';
import env from './utils/env.js';
import CopyWebpackPlugin from 'copy-webpack-plugin';
import HtmlWebpackPlugin from 'html-webpack-plugin';
import TerserPlugin from 'terser-webpack-plugin';
import { CleanWebpackPlugin } from 'clean-webpack-plugin';
import MiniCssExtractPlugin from 'mini-css-extract-plugin';

const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);

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

const alias = {
  'react-dom': '@hot-loader/react-dom',
};

// 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;
}

let options = {
  mode: process.env.NODE_ENV || 'development',
  entry: {
    options: path.join(__dirname, 'src', 'pages', 'Options', 'index.jsx'),
    popup: path.join(__dirname, 'src', 'pages', 'Popup', 'index.jsx'),
    background: path.join(__dirname, 'src', 'pages', 'Background', 'index.ts'),
    contentScript: path.join(
      __dirname,
      'src',
      'pages',
      'ContentScripts',
      'index.ts'
    ),
  },
  // "custom" is not a standard key of webpack options
  // it will be consumed by utils/server.js and must be deleted before webpack(config)
  custom: {
    notHMR: ['background', 'contentScript'],
    enableBackgroundAutoReload: true, // always true when "enableContentScriptsAutoReload" is set true
    enableContentScriptsAutoReload: true,
  },
  output: {
    filename: '[name].bundle.js',
    path: path.resolve(__dirname, 'build'),
    clean: true,
    publicPath: ASSET_PATH,
  },
  module: {
    rules: [
      {
        test: /README\.md$/,
        use: [
          {
            loader: './utils/features-loader.cjs',
          },
        ],
      },
      {
        // look for .css or .scss files
        test: /\.(css|scss)$/,
        // in the `src` directory
        use: [
          MiniCssExtractPlugin.loader,
          {
            loader: 'css-loader',
          },
          {
            loader: 'sass-loader',
            options: {
              sourceMap: true,
            },
          },
        ],
      },
      {
        test: new RegExp('.(' + fileExtensions.join('|') + ')$'),
        type: 'asset/resource',
        exclude: /node_modules/,
        // loader: 'file-loader',
        // options: {
        //   name: '[name].[ext]',
        // },
      },
      {
        test: /\.html$/,
        loader: 'html-loader',
        exclude: /node_modules/,
      },
      { test: /\.(ts|tsx)$/, loader: 'ts-loader', exclude: /node_modules/ },
      {
        test: /\.(js|jsx)$/,
        use: [
          {
            loader: 'source-map-loader',
          },
          {
            loader: 'babel-loader',
          },
        ],
        exclude: /node_modules/,
      },
    ],
  },
  resolve: {
    alias: alias,
    extensions: fileExtensions
      .map((extension) => '.' + extension)
      .concat(['.js', '.jsx', '.ts', '.tsx', '.css']),
  },
  plugins: [
    new MiniCssExtractPlugin(),
    new CleanWebpackPlugin({ verbose: false }),
    new webpack.ProgressPlugin(),
    // expose and write the allowed env vars on the compiled bundle
    new webpack.EnvironmentPlugin({
      NODE_ENV: env.NODE_ENV,
      PORT: env.PORT,
    }),
    new CopyWebpackPlugin({
      patterns: [
        {
          from: 'src/manifest.json',
          to: path.join(__dirname, 'build'),
          force: true,
          transform: function (content, path) {
            // 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()),
              })
            );
          },
        },
      ],
    }),
    new CopyWebpackPlugin({
      patterns: [
        {
          from: 'src/assets/img/main.png',
          to: path.join(__dirname, 'build'),
          force: true,
        },
      ],
    }),
    new HtmlWebpackPlugin({
      template: path.join(__dirname, 'src', 'pages', 'Options', 'index.html'),
      filename: 'options.html',
      chunks: ['options'],
      cache: false,
    }),
    new HtmlWebpackPlugin({
      template: path.join(__dirname, 'src', 'pages', 'Popup', 'index.html'),
      filename: 'popup.html',
      chunks: ['popup'],
      cache: false,
    }),
    // Work around for Buffer is undefined:
    new webpack.ProvidePlugin({
      Buffer: ['buffer', 'Buffer'],
    }),
  ],
  infrastructureLogging: {
    level: 'info',
  },
};

if (env.NODE_ENV === 'development') {
  options.devtool = 'cheap-module-source-map';
} else {
  options.optimization = {
    minimize: true,
    minimizer: [
      new TerserPlugin({
        extractComments: false,
        terserOptions: {
          // avoid all constructor.name to be 't' after code compression in production mode,
          // because the same constructor.name will lead to only one key in Features(a Map() obj),
          // which then faild the inject2Perceptor step.
          keep_fnames: true,
        },
      }),
    ],
  };
}

export default options;