// Note: You must restart bin/webpack-dev-server for changes to take effect

const webpack = require('webpack');
const { basename, dirname, join, relative, resolve } = require('path');
const { sync } = require('glob');
const ExtractTextPlugin = require('extract-text-webpack-plugin');
const ManifestPlugin = require('webpack-manifest-plugin');
const extname = require('path-complete-extname');
const { env, settings, themes, output, loadersDir } = require('./configuration.js');
const localePackPaths = require('./generateLocalePacks');

const extensionGlob = `**/*{${settings.extensions.join(',')}}*`;
const entryPath = join(settings.source_path, settings.source_entry_path);
const packPaths = sync(join(entryPath, extensionGlob));
const entryPacks = [...packPaths, ...localePackPaths].filter(path => path !== join(entryPath, 'custom.js'));

const themePaths = Object.keys(themes).reduce(
  (themePaths, name) => {
    const themeData = themes[name];
    themePaths[`themes/${name}`] = resolve(themeData.pack_directory, themeData.pack);
    return themePaths;
  }, {}
);

module.exports = {
  entry: Object.assign(
    entryPacks.reduce(
      (map, entry) => {
        const localMap = map;
        let namespace = relative(join(entryPath), dirname(entry));
        if (namespace === join('..', '..', '..', 'tmp', 'packs')) {
          namespace = ''; // generated by generateLocalePacks.js
        }
        localMap[join(namespace, basename(entry, extname(entry)))] = resolve(entry);
        return localMap;
      }, {}
    ), themePaths
  ),

  output: {
    filename: '[name].js',
    chunkFilename: '[name].js',
    path: output.path,
    publicPath: output.publicPath,
  },

  module: {
    rules: sync(join(loadersDir, '*.js')).map(loader => require(loader)),
  },

  plugins: [
    new webpack.EnvironmentPlugin(JSON.parse(JSON.stringify(env))),
    new webpack.NormalModuleReplacementPlugin(
      /^history\//, (resource) => {
        // temporary fix for https://github.com/ReactTraining/react-router/issues/5576
        // to reduce bundle size
        resource.request = resource.request.replace(/^history/, 'history/es');
      }
    ),
    new ExtractTextPlugin({
      filename: env.NODE_ENV === 'production' ? '[name]-[hash].css' : '[name].css',
      allChunks: true,
    }),
    new ManifestPlugin({
      publicPath: output.publicPath,
      writeToFileEmit: true,
    }),
    new webpack.optimize.CommonsChunkPlugin({
      name: 'common',
      minChunks: Infinity, // It doesn't make sense to use common chunks with multiple frontend support.
    }),
  ],

  resolve: {
    extensions: settings.extensions,
    modules: [
      resolve(settings.source_path),
      'node_modules',
    ],
  },

  resolveLoader: {
    modules: ['node_modules'],
  },

  node: {
    // Called by http-link-header in an API we never use, increases
    // bundle size unnecessarily
    Buffer: false,
  },
};
