const react = require('@neutrinojs/react');
const nodeExternals = require('webpack-node-externals');

const config = require('./.neutrinorc');

module.exports = ({name, files}, clientMains) => {
  const mains = files
    .filter((file) => file.match(/\.js$/))
    .map((file) => file.slice(0, -3))
    .reduce((r, file) => ({...r, [file]: file}), {});

  if (clientMains.length > 0) {
    const serverMains = Object
      .entries(mains)
      .filter(([key]) => -1 === clientMains.indexOf(key))
      .reduce((r, [k, v]) => ({...r, [k]: v}), {});
    const serverConfig = config();
    serverConfig.options.mains = serverMains;
    const clientConfig = config();
    clientConfig.options.mains = clientMains.reduce((r, file) => ({...r, [file]: file}), {});
    clientConfig.use[2] = (neutrino) => {
      react({
        clean: false,
      })(neutrino);
      Object.keys(clientConfig.options.mains).forEach((main) => {
        neutrino.config.plugins.delete(`html-${main}`);
      });
      neutrino.config
        .target('web')
        .optimization
          .splitChunks(false)
          .runtimeChunk(false)
        .end()
        .output
          .filename('[name].js')
          .library(name)
          .libraryTarget('umd')
          .umdNamedDefine(true);
    };
    clientConfig.use.push((neutrino) => {
      neutrino.config.node.set('Buffer', true);
    });
    return [serverConfig, clientConfig];
  }
  else {
    const serverConfig = config();
    serverConfig.options = {
      mains,
    };
    return [serverConfig];
  }
};