'use strict';

const { getOptionValue } = require('internal/options');

function initializeClusterIPC() {
  // If this is a worker in cluster mode, start up the communication
  // channel. This needs to be done before any user code gets executed
  // (including preload modules).
  if (process.argv[1] && process.env.NODE_UNIQUE_ID) {
    const cluster = require('cluster');
    cluster._setupWorker();
    // Make sure it's not accidentally inherited by child processes.
    delete process.env.NODE_UNIQUE_ID;
  }
}

function initializePolicy() {
  const experimentalPolicy = getOptionValue('--experimental-policy');
  if (experimentalPolicy) {
    process.emitWarning('Policies are experimental.',
                        'ExperimentalWarning');
    const { pathToFileURL, URL } = require('url');
    // URL here as it is slightly different parsing
    // no bare specifiers for now
    let manifestURL;
    if (require('path').isAbsolute(experimentalPolicy)) {
      manifestURL = new URL(`file:///${experimentalPolicy}`);
    } else {
      const cwdURL = pathToFileURL(process.cwd());
      cwdURL.pathname += '/';
      manifestURL = new URL(experimentalPolicy, cwdURL);
    }
    const fs = require('fs');
    const src = fs.readFileSync(manifestURL, 'utf8');
    require('internal/process/policy')
      .setup(src, manifestURL.href);
  }
}

function initializeESMLoader() {
  const experimentalModules = getOptionValue('--experimental-modules');
  const experimentalVMModules = getOptionValue('--experimental-vm-modules');
  if (experimentalModules || experimentalVMModules) {
    if (experimentalModules) {
      process.emitWarning(
        'The ESM module loader is experimental.',
        'ExperimentalWarning', undefined);
    }

    const {
      setImportModuleDynamicallyCallback,
      setInitializeImportMetaObjectCallback
    } = internalBinding('module_wrap');
    const esm = require('internal/process/esm_loader');
    // Setup per-isolate callbacks that locate data or callbacks that we keep
    // track of for different ESM modules.
    setInitializeImportMetaObjectCallback(esm.initializeImportMetaObject);
    setImportModuleDynamicallyCallback(esm.importModuleDynamicallyCallback);
    const userLoader = getOptionValue('--loader');
    // If --loader is specified, create a loader with user hooks. Otherwise
    // create the default loader.
    esm.initializeLoader(process.cwd(), userLoader);
  }
}

function loadPreloadModules() {
  // For user code, we preload modules if `-r` is passed
  const preloadModules = getOptionValue('--require');
  if (preloadModules) {
    const {
      _preloadModules
    } = require('internal/modules/cjs/loader');
    _preloadModules(preloadModules);
  }
}

module.exports = {
  initializeClusterIPC,
  initializePolicy,
  initializeESMLoader,
  loadPreloadModules
};