const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const CopyWebpackPlugin = require('copy-webpack-plugin');
const ReactRefreshWebpackPlugin = require('@pmmmwh/react-refresh-webpack-plugin');
const FaviconsWebpackPlugin = require('favicons-webpack-plugin');
const TerserPlugin = require('terser-webpack-plugin');
const CompressionPlugin = require('compression-webpack-plugin');
const zlib = require('zlib');
const sharp = require('sharp');
const webpack = require('webpack');
const packageJson = require('./package.json');

const HOUSE_IMAGE_WIDTH = 260;

function envString(...names) {
  for (const name of names) {
    const value = process.env[name];
    if (typeof value === 'string' && value.trim().length > 0) {
      return value.trim();
    }
  }
  return undefined;
}

function envBoolean(name, fallback = false) {
  const value = process.env[name];
  if (typeof value !== 'string' || value.trim().length === 0) {
    return fallback;
  }
  return ['1', 'true', 'yes', 'on'].includes(value.trim().toLowerCase());
}

module.exports = (env, argv) => {
  const isProduction = argv.mode === 'production';
  const bugsinkEnvironment =
    envString('FRONTEND_BUGSINK_ENVIRONMENT', 'BUGSINK_ENVIRONMENT', 'SENTRY_ENVIRONMENT') ||
    (isProduction ? 'production' : 'development');
  const bugsinkRelease =
    envString('FRONTEND_BUGSINK_RELEASE', 'BUGSINK_RELEASE', 'SENTRY_RELEASE') ||
    `${packageJson.name}@${packageJson.version}`;

  return {
    entry: './src/index.tsx',
    output: {
      path: path.resolve(__dirname, 'dist'),
      filename: isProduction ? '[name].[contenthash:8].js' : 'bundle.js',
      chunkFilename: isProduction ? '[name].[contenthash:8].js' : '[name].bundle.js',
      clean: true,

      publicPath: '/',
    },
    devtool: isProduction ? 'hidden-source-map' : 'eval-cheap-module-source-map',
    resolve: {
      extensions: ['.ts', '.tsx', '.js'],
    },
    module: {
      rules: [
        {
          test: /\.tsx?$/,
          exclude: /node_modules/,
          use: {
            loader: 'babel-loader',
            options: {
              presets: [
                '@babel/preset-env',
                ['@babel/preset-react', { runtime: 'automatic' }],
                '@babel/preset-typescript',
              ],
              plugins: isProduction ? [] : ['react-refresh/babel'],
            },
          },
        },
        {
          test: /\.css$/,
          use: [
            isProduction ? MiniCssExtractPlugin.loader : 'style-loader',
            {
              loader: 'css-loader',
              options: {
                url: {
                  filter: (url) => !url.startsWith('/'),
                },
              },
            },
            'postcss-loader',
          ],
        },
      ],
    },
    plugins: [
      new webpack.DefinePlugin({
        __DEV__: JSON.stringify(!isProduction),
        __BUGSINK_DSN__: JSON.stringify(
          envString('FRONTEND_BUGSINK_DSN', 'PUBLIC_BUGSINK_DSN', 'BUGSINK_DSN') || ''
        ),
        __BUGSINK_ENVIRONMENT__: JSON.stringify(bugsinkEnvironment),
        __BUGSINK_RELEASE__: JSON.stringify(bugsinkRelease),
        __BUGSINK_SEND_DEFAULT_PII__: JSON.stringify(
          envBoolean('BUGSINK_SEND_DEFAULT_PII', false)
        ),
      }),
      new HtmlWebpackPlugin({
        template: './src/index.html',
      }),
      new CopyWebpackPlugin({
        patterns: [
          {
            from: 'public',
            noErrorOnMissing: true,
            globOptions: {
              ignore: ['**/house.png'],
            },
          },
          isProduction
            ? {
                from: 'public/house.png',
                to: 'house.png',
                noErrorOnMissing: true,
                transform: {
                  transformer(content) {
                    return sharp(content)
                      .resize({ width: HOUSE_IMAGE_WIDTH, withoutEnlargement: true })
                      .png({ compressionLevel: 9, palette: true, quality: 85 })
                      .toBuffer();
                  },
                },
              }
            : {
                from: 'public/house.png',
                to: 'house.png',
                noErrorOnMissing: true,
              },
        ],
      }),
      new FaviconsWebpackPlugin({
        logo: './public/favicon.svg',
        favicons: {
          background: '#0c0a09',
          icons: {
            favicons: true,
            android: false,
            appleIcon: false,
            appleStartup: false,
            yandex: false,
            windows: false,
          },
        },
      }),
      ...(isProduction
        ? [
            new MiniCssExtractPlugin({
              filename: '[name].[contenthash:8].css',
              chunkFilename: '[name].[contenthash:8].css',
            }),
            new CompressionPlugin({
              filename: '[path][base].gz',
              algorithm: 'gzip',
              test: /\.(js|css|html|svg|json|wasm)$/,
              threshold: 1024,
              minRatio: 0.8,
            }),
            new CompressionPlugin({
              filename: '[path][base].br',
              algorithm: 'brotliCompress',
              test: /\.(js|css|html|svg|json|wasm)$/,
              compressionOptions: {
                params: {
                  [zlib.constants.BROTLI_PARAM_QUALITY]: 11,
                },
              },
              threshold: 1024,
              minRatio: 0.8,
            }),
          ]
        : [new ReactRefreshWebpackPlugin()]),
    ],
    optimization: isProduction
      ? {
          minimize: true,
          minimizer: [
            new TerserPlugin({
              parallel: true,
              extractComments: false,
              terserOptions: {
                compress: {
                  drop_console: true,
                  drop_debugger: true,
                  passes: 2,
                },
                format: {
                  comments: false,
                },
                keep_classnames: true,
                keep_fnames: false,
              },
            }),
          ],
          splitChunks: {
            chunks: 'all',
            cacheGroups: {
              maplibre: {
                test: /[\\/]node_modules[\\/]maplibre-gl[\\/]/,
                name: 'vendor-maplibre',
                chunks: 'async',
                priority: 50,
                enforce: true,
                reuseExistingChunk: true,
              },
              h3: {
                test: /[\\/]node_modules[\\/]h3-js[\\/]/,
                name: 'vendor-h3',
                chunks: 'async',
                priority: 45,
                enforce: true,
                reuseExistingChunk: true,
              },
              deckMapbox: {
                test: /[\\/]node_modules[\\/]@deck\.gl[\\/]mapbox[\\/]/,
                name: 'vendor-deck-mapbox',
                chunks: 'async',
                priority: 44,
                enforce: true,
                reuseExistingChunk: true,
              },
              deckCore: {
                test: /[\\/]node_modules[\\/]@deck\.gl[\\/]core[\\/]/,
                name: 'vendor-deck-core',
                chunks: 'async',
                priority: 43,
                enforce: true,
                reuseExistingChunk: true,
              },
              deckLayers: {
                test: /[\\/]node_modules[\\/]@deck\.gl[\\/](?:layers|geo-layers)[\\/]/,
                name: 'vendor-deck-layers',
                chunks: 'async',
                priority: 42,
                enforce: true,
                reuseExistingChunk: true,
              },
              deck: {
                test: /[\\/]node_modules[\\/]@deck\.gl[\\/]/,
                name: 'vendor-deck',
                chunks: 'async',
                priority: 40,
                enforce: true,
                reuseExistingChunk: true,
              },
              luma: {
                test: /[\\/]node_modules[\\/]@luma\.gl[\\/]/,
                name: 'vendor-luma',
                chunks: 'async',
                priority: 35,
                enforce: true,
                reuseExistingChunk: true,
              },
              webgpuSupport: {
                test: /[\\/]node_modules[\\/]wgsl_reflect[\\/]/,
                name: 'vendor-webgpu-support',
                chunks: 'async',
                priority: 34,
                enforce: true,
                reuseExistingChunk: true,
              },
              mapData: {
                test: /[\\/]node_modules[\\/](?:@mapbox[\\/]tiny-sdf|@protomaps[\\/]basemaps|earcut|supercluster)[\\/]/,
                name: 'vendor-map-data',
                chunks: 'async',
                priority: 33,
                enforce: true,
                reuseExistingChunk: true,
              },
              mapSupport: {
                test: /[\\/]node_modules[\\/](?:@loaders\.gl|@math\.gl|@probe\.gl|@vis\.gl|mjolnir\.js|react-map-gl)[\\/]/,
                name: 'vendor-map-support',
                chunks: 'async',
                priority: 30,
                enforce: true,
                reuseExistingChunk: true,
              },
              joyride: {
                test: /[\\/]node_modules[\\/](?:react-joyride|deepmerge|scroll|scrollparent|react-innertext)[\\/]/,
                name: 'vendor-joyride',
                chunks: 'async',
                priority: 25,
                enforce: true,
                reuseExistingChunk: true,
              },
            },
          },
        }
      : undefined,
    devServer: {
      host: '0.0.0.0',
      port: 3001,
      allowedHosts: 'all',
      client: {
        webSocketURL: 'auto://0.0.0.0:0/ws',
      },
      historyApiFallback: {
        index: '/index.html',
      },
      hot: true,
      liveReload: true,
      static: {
        directory: path.resolve(__dirname, 'public'),
        watch: {
          ignored: ['**/assets/**'],
        },
      },
      proxy: [
        {
          context: ['/api', '/s'],
          target: process.env.API_PROXY_TARGET || 'http://localhost:8001',
        },
        {
          context: ['/pb'],
          target: process.env.PB_PROXY_TARGET || 'http://localhost:8090',
          pathRewrite: { '^/pb': '' },
        },
      ],
    },
  };
};