browser.js

'use strict';
const electron = require('electron');
const config = require('./config');
const elementReady = require('element-ready');

const ipcRenderer = electron.ipcRenderer;
const $ = document.querySelector.bind(document);

var post = 0;

const selectors = {
  root: '#react-root ._onabe',
  loginButton: '#react-root ._fcn8k'
};


ipcRenderer.on('toggle-dark-mode', () => {
  config.set('darkMode', !config.get('darkMode'));
  setDarkMode();
});


ipcRenderer.on('navigate-home', () => {
  const home = $('._n7q2c ._r1svv:nth-child(1) a');
  if(home) {
    home.click();
  }
});


ipcRenderer.on('navigate-discover', () => {
  const discover = $('._n7q2c ._r1svv:nth-child(2) a');
  if(discover) {
    discover.click();
  }
});


ipcRenderer.on('navigate-notifications', () => {
  const notifications = $('._n7q2c ._r1svv:nth-child(3) a');
  if(notifications) {
    notifications.click();
  }
});


ipcRenderer.on('navigate-profile', () => {
  const profile = $('._n7q2c ._r1svv:nth-child(4) a');
  console.log(profile);
  if(profile) {
    profile.click();
  }
});

ipcRenderer.on('navigate-up', () => {
  if (post > 1 ){
    post -= 1;
    var title = $('#react-root > section > main > section > div > div:nth-child(1) > article:nth-child('+post+') > header');
    var rect = title.getBoundingClientRect();
    window.scrollBy(0,rect.top);
  }
});

ipcRenderer.on('navigate-down', () => {
  post += 1;
  var title = $('#react-root > section > main > section > div > div:nth-child(1) > article:nth-child('+post+') > header');
  var rect = title.getBoundingClientRect();
  window.scrollBy(0,rect.top);
});


function backButton() {
  const body = $('body');
  const link = document.createElement('a');
  const element = document.createElement('div');

  link.innerHTML = '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 22.84 17.39"><polygon points="22.84 8.22 1.82 8.22 9.37 0.67 8.7 0 0 8.7 8.7 17.39 9.37 16.72 1.82 9.17 22.84 9.17 22.84 8.22"/></svg>'
  element.classList.add('back-btn', 'inactive');
  element.appendChild(link);
  body.appendChild(element);

  link.addEventListener('click', event => {
    ipcRenderer.send('back');
  });

  ipcRenderer.on('set-button-state', (event, enabled) => {
    if (enabled) {
      element.classList.remove('inactive');
    } else {
      element.classList.add('inactive');
    }
  });
}


function login(elm) {
  elm.addEventListener('click', (e) => {
    elm.classList.toggle('goback');
    process.nextTick(() => {
      if (elm.classList.contains('goback')) {
        elm.innerText = 'Go back';
      } else {
        elm.innerText = 'Log In';
      }
    });
  });
}


function setDarkMode() {
  document.documentElement.classList.toggle('dark-mode', config.get('darkMode'));
}


function init() {
  backButton();
  setDarkMode();

  // Prevent flash of white on startup when in dark mode
  // TODO: Find solution to this with pure css
  if (config.get('darkMode')) {
    document.documentElement.style.backgroundColor = '#192633';
  }
}


document.addEventListener('DOMContentLoaded', (event) => {
  // enable OS specific styles
  document.documentElement.classList.add(`os-${process.platform}`);

  elementReady(selectors.root).then(init);
  elementReady(selectors.loginButton).then(login);
});