const path = require('path')
const { readFileSync, readdirSync } = require('fs')
const webpack = require('webpack')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const VueLoaderPlugin = require('vue-loader/lib/plugin')
const MiniCssExtractPlugin = require('mini-css-extract-plugin')
const CssMinimizerPlugin = require('css-minimizer-webpack-plugin')
const ProcessLocalesPlugin = require('./ProcessLocalesPlugin')
const WatchExternalFilesPlugin = require('webpack-watch-external-files-plugin')
const CopyWebpackPlugin = require('copy-webpack-plugin')

const isDevMode = process.env.NODE_ENV === 'development'

const { version: swiperVersion } = JSON.parse(readFileSync(path.join(__dirname, '../node_modules/swiper/package.json')))

const processLocalesPlugin = new ProcessLocalesPlugin({
  compress: !isDevMode,
  inputDir: path.join(__dirname, '../static/locales'),
  outputDir: 'static/locales',
})

const config = {
  name: 'renderer',
  mode: process.env.NODE_ENV,
  devtool: isDevMode ? 'eval-cheap-module-source-map' : false,
  entry: {
    renderer: path.join(__dirname, '../src/renderer/main.js'),
  },
  infrastructureLogging: {
    // Only warnings and errors
    // level: 'none' disable logging
    // Please read https://webpack.js.org/configuration/other-options/#infrastructurelogginglevel
    level: isDevMode ? 'info' : 'none'
  },
  output: {
    libraryTarget: 'commonjs2',
    path: path.join(__dirname, '../dist'),
    filename: '[name].js',
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        use: 'babel-loader',
        exclude: /node_modules/,
      },
      {
        test: /\.vue$/,
        loader: 'vue-loader',
        options: {
          compilerOptions: {
            whitespace: 'condense',
          }
        }
      },
      {
        test: /\.scss$/,
        use: [
          {
            loader: MiniCssExtractPlugin.loader,
          },
          {
            loader: 'css-loader',
            options: {
              esModule: false
            }
          },
          {
            loader: 'sass-loader',
            options: {
              implementation: require('sass')
            }
          },
        ],
      },
      {
        test: /\.css$/,
        use: [
          {
            loader: MiniCssExtractPlugin.loader
          },
          {
            loader: 'css-loader',
            options: {
              esModule: false
            }
          }
        ],
      },
      {
        test: /\.(png|jpe?g|gif|tif?f|bmp|webp|svg)(\?.*)?$/,
        type: 'asset/resource',
        generator: {
          filename: 'imgs/[name][ext]'
        }
      },
      {
        test: /\.(woff2?|eot|ttf|otf)(\?.*)?$/,
        type: 'asset/resource',
        generator: {
          filename: 'fonts/[name][ext]'
        }
      },
    ],
  },
  // webpack defaults to only optimising the production builds, so having this here is fine
  optimization: {
    minimizer: [
      '...', // extend webpack's list instead of overwriting it
      new CssMinimizerPlugin()
    ]
  },
  node: {
    __dirname: false,
    __filename: false
  },
  plugins: [
    processLocalesPlugin,
    new webpack.DefinePlugin({
      'process.env.IS_ELECTRON': true,
      'process.env.IS_ELECTRON_MAIN': false,
      'process.env.SUPPORTS_LOCAL_API': true,
      'process.env.LOCALE_NAMES': JSON.stringify(processLocalesPlugin.localeNames),
      'process.env.GEOLOCATION_NAMES': JSON.stringify(readdirSync(path.join(__dirname, '..', 'static', 'geolocations')).map(filename => filename.replace('.json', ''))),
      'process.env.SWIPER_VERSION': `'${swiperVersion}'`
    }),
    new HtmlWebpackPlugin({
      excludeChunks: ['processTaskWorker'],
      filename: 'index.html',
      template: path.resolve(__dirname, '../src/index.ejs')
    }),
    new VueLoaderPlugin(),
    new MiniCssExtractPlugin({
      filename: isDevMode ? '[name].css' : '[name].[contenthash].css',
      chunkFilename: isDevMode ? '[id].css' : '[id].[contenthash].css',
    }),
    new CopyWebpackPlugin({
      patterns: [
        {
          from: path.join(__dirname, '../node_modules/swiper/modules/{a11y,navigation,pagination}-element.css').replaceAll('\\', '/'),
          to: `swiper-${swiperVersion}.css`,
          context: path.join(__dirname, '../node_modules/swiper/modules'),
          transformAll: (assets) => {
            return Buffer.concat(assets.map(asset => asset.data))
          }
        }
      ]
    })
  ],
  resolve: {
    alias: {
      vue$: 'vue/dist/vue.runtime.esm.js',

      'DB_HANDLERS_ELECTRON_RENDERER_OR_WEB$': path.resolve(__dirname, '../src/datastores/handlers/electron.js'),

      'youtubei.js$': 'youtubei.js/web',

      // video.js's mpd-parser uses @xmldom/xmldom so that it can support both node and web browsers
      // as FreeTube only runs in electron and web browsers we can use the native DOMParser class, instead of the "polyfill"
      // https://caniuse.com/mdn-api_domparser
      '@xmldom/xmldom$': path.resolve(__dirname, '_domParser.js')
    },
    extensions: ['.js', '.vue']
  },
  target: 'electron-renderer',
}

if (isDevMode) {
  const activeLocales = JSON.parse(readFileSync(path.join(__dirname, '../static/locales/activeLocales.json')))

  config.plugins.push(
    new WatchExternalFilesPlugin({
      files: [
        `./static/locales/{${activeLocales.join(',')}}.yaml`,
      ],
    }),
  )
}

module.exports = config