const path = require('path')
const MiniCssExtractPlugin = require('mini-css-extract-plugin')
const CleanWebpackPlugin = require('clean-webpack-plugin')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const CopyWebpackPlugin = require('copy-webpack-plugin')

module.exports = {
  entry: {
    background: './src/js/background.js',
    content: './src/js/content.js',
    popup: './src/js/popup.js',
    options: './src/js/options.js'
  },
  output: {
    path: path.join(__dirname, 'build'),
    filename: '[name].js'
  },
  module: {
    rules: [
      {
        test: /\.scss$/,
        use: [
          {
            loader: MiniCssExtractPlugin.loader
          },
          'css-loader',
          {
            loader: 'sass-loader',
            options: {
              includePaths: [path.join(__dirname, 'src/css')]
            }
          }
        ],
        exclude: /node_modules/
      },
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader'
        }
      },
      {
        test: /\.(jpg|png)$/,
        loader: 'file-loader',
        options: {
          name: '[path][name].[ext]'
        },
        exclude: /node_modules/
      }
    ]
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: '[name].css',
      chunkFilename: '[id].css'
    }),
    new CleanWebpackPlugin(['build']),
    new CopyWebpackPlugin([
      {
        from: 'src/manifest.json',
        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 HtmlWebpackPlugin({
      template: path.join(__dirname, 'src', 'popup.html'),
      filename: 'popup.html',
      chunks: ['popup']
    }),
    new HtmlWebpackPlugin({
      template: path.join(__dirname, 'src', 'options.html'),
      filename: 'options.html',
      chunks: ['options']
    })
  ],
  resolve: {
    modules: [path.join(__dirname, 'src/js'), 'node_modules'],
    alias: {
      images: path.join(__dirname, 'src/images')
    }
  },
  // webpack creates sourcemaps by default and evals js code
  // this is not allowed by chrome extensions
  // https://stackoverflow.com/a/49100966
  devtool: 'none',
  mode: process.env.NODE_ENV || 'development'
}