const library = require('@neutrinojs/library');

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) => {
      library({
        clean: false,
        name,
        target: 'web',
      })(neutrino);
    };
    clientConfig.use.push((neutrino) => {
      neutrino.config.node.set('Buffer', true);
    });
    return [serverConfig, clientConfig];
  }
  else {
    const serverConfig = config();
    serverConfig.options = {
      mains,
    };
    return [serverConfig];
  }
};