/* eslint-disable no-console */
require('dotenv').config();
const path = require('path');

const webpack = require('webpack');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const { CleanWebpackPlugin } = require('clean-webpack-plugin');
const Copy = require('copy-webpack-plugin');
const Html = require('html-webpack-plugin');
const Define = webpack.DefinePlugin;
const BundleAnalyze = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;

const publicFolder = path.resolve(__dirname, 'public');
const env = process.env.NODE_ENV || 'development';
const remarkUrl = process.env.REMARK_URL || 'https://demo.remark42.com';
const NODE_ID = 'remark42';
const pathToCustomCssProperties = './app/custom-properties.css';

// let's log some env variables because we can
console.log(`NODE_ENV = ${env}`);
console.log(`REMARK_ENV = ${remarkUrl}`);

/**
 * Generates excludes for babel-loader
 *
 * Exclude is a module that has >=es6 code and resides in node_modules.
 * By defaut babel-loader ignores everything from node_modules,
 * so we have to exclude from ignore these modules
 */
function getExcluded() {
  const modules = [
    '@github/markdown-toolbar-element',
    '@github/text-expander-element',
    '@github/combobox-nav',
    'react-intl',
    'intl-messageformat',
    'intl-messageformat-parser',
  ];
  const exclude = new RegExp(`node_modules\\/(?!(${modules.map(m => m.replace(/\//g, '\\/')).join('|')})\\/).*`);

  return {
    exclude,
  };
}

// console.log(getExcluded())
// process.exit(1)

const postCssLoader = wrap => ({
  loader: 'postcss-loader',
  options: {
    plugins: [
      require('postcss-custom-properties')({
        importFrom: path.resolve(__dirname, pathToCustomCssProperties),
      }),
      require('postcss-for'),
      require('postcss-simple-vars'),
      require('postcss-nested'),
      require('postcss-calc'),
      require('autoprefixer'),
      require('postcss-url')({ url: 'inline', maxSize: 5 }),
      wrap ? require('postcss-prefixwrap')(`#${NODE_ID}`, { ignoredSelectors: [':root'] }) : false,
      require('postcss-csso'),
    ].filter(plugin => plugin),
  },
});

const commonStyleLoaders = ['css-loader', postCssLoader(true)];

const babelConfigPath = path.resolve(__dirname, './.babelrc.js');

module.exports = () => ({
  context: __dirname,
  devtool: env === 'development' ? 'source-map' : false,
  entry: {
    embed: './app/embed.ts',
    counter: './app/counter.ts',
    'last-comments': [pathToCustomCssProperties, './app/last-comments.tsx'],
    remark: [pathToCustomCssProperties, './app/remark.tsx'],
    deleteme: './app/deleteme.ts',
  },
  output: {
    path: publicFolder,
    filename: `[name].js`,
    chunkFilename: '[name].js',
  },
  resolve: {
    extensions: ['.tsx', '.ts', '.jsx', '.js'],
    alias: {
      '@app': path.resolve(__dirname, 'app'),
      react: 'preact/compat',
      'react-dom': 'preact/compat',
    },
    modules: [path.resolve(__dirname, 'node_modules')],
  },
  module: {
    rules: [
      {
        oneOf: [
          {
            include: [path.resolve(__dirname, './app/embed.ts'), path.resolve(__dirname, './app/counter.ts')],
            use: {
              loader: 'ts-loader',
              options: {
                compilerOptions: {
                  lib: ['es5', 'dom'],
                  target: 'es5',
                  downlevelIteration: true,
                },
              },
            },
          },
          {
            test: /\.js(x?)$/,
            use: [{ loader: 'babel-loader', options: { configFile: babelConfigPath } }],
            ...getExcluded(),
          },
          {
            test: /\.ts(x?)$/,
            use: [{ loader: 'babel-loader', options: { configFile: babelConfigPath } }, 'ts-loader'],
            ...getExcluded(),
          },
          {
            test: /\.(s?css|pcss)$/,
            exclude: /\.module\.pcss$/,
            use: [
              {
                loader: MiniCssExtractPlugin.loader,
              },
              ...commonStyleLoaders,
            ],
          },
          {
            test: /\.module\.pcss$/,
            use: [
              {
                loader: MiniCssExtractPlugin.loader,
              },
              {
                loader: 'css-loader',
                options: {
                  modules: {
                    mode: `local`,
                    localIdentName: `${NODE_ID}__[name]__[local]`,
                  },
                },
              },
              postCssLoader(false),
            ],
          },
          {
            test: /\.(png|jpg|jpeg|gif|svg)$/,
            use: {
              loader: 'file-loader',
              options: {
                name: `files/[name].[hash].[ext]`,
              },
            },
          },
        ],
      },
    ],
  },
  plugins: [
    new CleanWebpackPlugin(),
    new Define({
      'process.env.NODE_ENV': JSON.stringify(env),
      'process.env.REMARK_NODE': JSON.stringify(NODE_ID),
      'process.env.REMARK_URL': env === 'production' ? JSON.stringify(remarkUrl) : 'window.location.origin',
    }),
    new Html({
      template: path.resolve(__dirname, 'iframe.html'),
      filename: 'iframe.html',
      inject: false,
      env,
    }),
    new Html({
      template: path.resolve(__dirname, 'index.ejs'),
      inject: false,
    }),
    new Html({
      template: path.resolve(__dirname, 'counter.ejs'),
      filename: 'counter.html',
      inject: false,
    }),
    new Html({
      template: path.resolve(__dirname, 'last-comments.ejs'),
      filename: 'last-comments.html',
      inject: false,
    }),
    new Html({
      template: path.resolve(__dirname, 'comments.ejs'),
      filename: 'comments.html',
      inject: false,
    }),
    new MiniCssExtractPlugin({
      filename: '[name].css',
    }),
    new webpack.optimize.ModuleConcatenationPlugin(),
    ...(process.env.CI
      ? []
      : [
          new BundleAnalyze({
            analyzerMode: 'static',
            reportFilename: 'report.html',
            defaultSizes: 'parsed',
            generateStatsFile: false,
            logLevel: 'info',
            openAnalyzer: false,
          }),
        ]),
    new Copy({
      patterns: [
        { from: './deleteme.html', to: 'deleteme.html' },
        { from: './markdown-help.html', to: 'markdown-help.html' },
      ],
    }),
  ],
  watchOptions: {
    ignored: /(node_modules|\.vendor\.js$)/,
    aggregateTimeout: 3000,
  },
  stats: {
    children: false,
    entrypoints: false,
  },
  devServer: {
    host: '0.0.0.0',
    port: process.env.PORT || 9000,
    contentBase: publicFolder,
    publicPath: '/web',
    disableHostCheck: true,
    proxy: {
      '/api': {
        target: remarkUrl,
        logLevel: 'debug',
        changeOrigin: true,
      },
      '/auth': {
        target: remarkUrl,
        logLevel: 'debug',
        changeOrigin: true,
      },
    },
    stats: {
      children: false,
      entrypoints: false,
    },
  },
});