#!/usr/bin/env node

'use strict';

const {

  copyFileSync,

  existsSync,

  mkdirSync,

  readFileSync,

  rmdirSync,

} = require('fs');

const {join} = require('path');

const http = require('http');

const DEPENDENCIES = [

  ['scheduler/umd/scheduler.development.js', 'scheduler.js'],

  ['react/umd/react.development.js', 'react.js'],

  ['react-dom/umd/react-dom.development.js', 'react-dom.js'],

];

const BUILD_DIRECTORY = '../../../build/oss-experimental/';

const DEPENDENCIES_DIRECTORY = 'dependencies';

function initDependencies() {

  if (existsSync(DEPENDENCIES_DIRECTORY)) {

    rmdirSync(DEPENDENCIES_DIRECTORY, {recursive: true});

  }

  mkdirSync(DEPENDENCIES_DIRECTORY);

  DEPENDENCIES.forEach(([from, to]) => {

    const fromPath = join(__dirname, BUILD_DIRECTORY, from);

    const toPath = join(__dirname, DEPENDENCIES_DIRECTORY, to);

    console.log(`Copying ${fromPath} => ${toPath}`);

    copyFileSync(fromPath, toPath);

  });

}

function initServer() {

  const host = 'localhost';

  const port = 8000;

  const requestListener = function (request, response) {

    let contents;

    switch (request.url) {

      case '/react.js':

      case '/react-dom.js':

      case '/scheduler.js':

        response.setHeader('Content-Type', 'text/javascript');

        response.writeHead(200);

        contents = readFileSync(

          join(__dirname, DEPENDENCIES_DIRECTORY, request.url)

        );

        response.end(contents);

        break;

      case '/app.js':

        response.setHeader('Content-Type', 'text/javascript');

        response.writeHead(200);

        contents = readFileSync(join(__dirname, 'app.js'));

        response.end(contents);

        break;

      case '/index.html':

      default:

        response.setHeader('Content-Type', 'text/html');

        response.writeHead(200);

        contents = readFileSync(join(__dirname, 'index.html'));

        response.end(contents);

        break;

    }

  };

  const server = http.createServer(requestListener);

  server.listen(port, host, () => {

    console.log(`Server is running on http://${host}:${port}`);

  });

}

initDependencies();

initServer();