const fs = require('fs');
const path = require('path');
const Electron = require('macaca-electron');

const electron = new Electron();

/**
  default options
  {
    show: true,
    alwaysOnTop: false,
    x: 0,
    y: 0,
    width: 800,
    height: 600,
    userAgent: 'userAgent string',
    webPreferences: {
      nodeIntegration: false
    }
  }
*/
const sleep = ms => new Promise(resolve => setTimeout(resolve, ms));

(async () => {
  await electron.startDevice({
    show: false // in silence
  });
  await electron.maximize();
  await electron.setWindowSize(null, 500, 500);
  await electron.get('https://www.baidu.com');
  await sleep(3000);
  const imgData = await electron.getScreenshot();
  const img = Buffer.from(imgData, 'base64');
  const p = path.join('screenshot.png');
  fs.writeFileSync(p, img.toString('binary'), 'binary');
  console.log(`screenshot: ${p}`);

  await electron.stopDevice();
})();