electron.js

const {app, BrowserWindow, ipcMain, ipcRenderer} = require('electron')
const path = require('path')
const express = require('express')
var bodyParser = require('body-parser')
const fs = require("fs")

let serverStarted = false;
let mainWindow;

process.env['ELECTRON_DISABLE_SECURITY_WARNINGS'] = 'true'

var configData = {
  port: 4444, 
  scene: null,
  password: null,
  covers: {
    draft: null,
    minimap: null,
  },
};
const configFile = `${app.getAppPath()}/config.json`

function createWindow() {
  mainWindow = new BrowserWindow({
    width: 400, 
    height: 775,
    resizable: false,
    fullscreenable: false,
    backgroundColor: '#1f1f1f',
    webPreferences: {
      preload: path.join(__dirname, 'preload.js'),
      nodeIntegration: true,
      webSecurity: false
    },
  })
  mainWindow.loadURL('http://127.0.0.1:8000');
  //mainWindow.webContents.openDevTools()
  loadConfig()
}

function loadConfig() {
  fs.exists(configFile, exists => {
    if (exists) {
      console.log(`Loaded config from: ${configFile}`)
      fs.readFile(configFile, 'utf8', (err, data) => {
        if (err) {
          return console.error(err);
        }
        configData = JSON.parse(data);
      })
    } else {
      console.log("Config file not exists! creating one.")
      fs.writeFile(configFile, JSON.stringify(configData), (err, data) => {
        if (err) {
          return console.error(err)
        }
      })
    }
  })
}

app.whenReady().then(() => {

  createWindow()

  app.on('activate', function () {
    // On macOS it's common to re-create a window in the app when the
    // dock icon is clicked and there are no other windows open.
    if (BrowserWindow.getAllWindows().length === 0) createWindow()
  })

  ipcMain.on('update_config', (_, config) => {
    configData = config;
    fs.writeFile(configFile, JSON.stringify(config), (err, data) => {
      if (err) {
        return console.error(err)
      }
    });
  })

  ipcMain.on('config', () => {
    mainWindow.webContents.send('config_loaded', {config: configData})
  });
  
  ipcMain.on('start-server', (_, config) => {
    
    //console.log(config);
    
    if (!serverStarted) {
      
      const httpApp = express()

      httpApp.use(bodyParser.json());
      
      httpApp.get('/', (req, res) => {
        const data = req.body;
        if (data.map.name === "start") {
          switch (data.map.game_state) {
            case "DOTA_GAMERULES_STATE_HERO_SELECTION":
              console.log("Choosing hero...")    
              mainWindow.webContents.send('toggle_drafting_cover', {visible: true});
              mainWindow.webContents.send('toggle_minimap_cover', {visible: false});
              break
            case "DOTA_GAMERULES_STATE_PLAYING":
              mainWindow.webContents.send('toggle_drafting_cover', {visible: false});
              mainWindow.webContents.send('toggle_minimap_cover', {visible: true});
              break
            case "DOTA_GAMERULES_STATE_POST_GAME":
              mainWindow.webContents.send('toggle_drafting_cover', {visible: false});
              mainWindow.webContents.send('toggle_minimap_cover', {visible: false});
              break
            default:
              mainWindow.webContents.send('toggle_drafting_cover', {visible: false})
              mainWindow.webContents.send('toggle_minimap_cover', {visible: false});
              break
          }
        }
        res.sendStatus(200)
      })
      httpApp.listen(31558, () => console.log('Server running on port 31558!'))
      serverStarted = true;
    }
  })

  app.on('window-all-closed', () => {
    if(process.platform !== 'darwin') app.quit()
  })

});