Wadsworth Constant

Script adds a posibility to apply Wadsworth Constant to YouTube videos. Two buttons are added, one to apply and to auto-switch.

You will need to install an extension such as Tampermonkey, Greasemonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install a user script manager extension to install this script.

(I already have a user script manager, let me install it!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)

// ==UserScript==
// @name        Wadsworth Constant
// @description     Script adds a posibility to apply Wadsworth Constant to YouTube videos. Two buttons are added, one to apply and to auto-switch.
// @namespace   Wadsworth Constant
// @include http*://*.youtube.com/*
// @include http*://www.youtube.com/*
// @include http*://youtube.com/*
// @grant       GM_getValue
// @grant       GM_setValue
// @grant       GM_xmlhttpRequest
// @noframes
// @run-at document-end
// @author      Dexmaster
// @icon        http://i1.kym-cdn.com/photos/images/masonry/000/257/513/662.jpg
// @co-author   Jake Lauer
// @version     1.2.1
// ==/UserScript==
(function () {
  'use strict';
  var c_loc = window.location.search,
  loaded = false;
  function hms_to_s(hms) {
    var arr = hms.split(':'),
        sec = 0, mult = 1;
    while (arr.length > 0) {
        sec = sec + mult * parseInt(arr.pop(), 10);
        mult = mult * 60;
    }
    return parseInt(sec);
  }
  function ww_apply(apply) {
    var url; //,saveURL
    if (!!apply) {
      url = window.location.href;
      if (url.match('#') || url.match('&t')) {
        url = url.split('#') [0].split('&t') [0];
      }
      url = url.split('?') [1].split('&') [0].split('=') [1];
      url = 'https://www.googleapis.com/youtube/v3/videos?part=contentDetails&id='+url+'&key=AIzaSyDrsu_ibWlFRzBPAA2tAqaJcK2gqLhmIQI';
      //console.log(url);
      if (url === 'https://gdata.youtube.com/feeds/api/videos/') {
        //console.log('Something went wrong... dunno what it was. Sorry!');
      }
      window.location.hash = '#';
      //console.log(saveURL);
      GM_xmlhttpRequest({
        method: 'GET',
        // ignoreCache: true,
        redirectionLimit: 0,
        url: url,
        onerror: function (res) {
          var msg = 'An error occurred.' + '\nresponseText: ' + res.responseText + '\nreadyState: ' + res.readyState + '\nresponseHeaders: ' + res.responseHeaders + '\nstatus: ' + res.status + '\nstatusText: ' + res.statusText + '\nfinalUrl: ' + res.finalUrl;
          console.log(msg);
        },
        onload: function (xhr) {
          if (xhr.readyState === 4) {
            if (xhr.status === 200 && xhr.responseText && xhr.responseText.length > 20) {
              var results = JSON.parse(xhr.responseText),
              duration = hms_to_s(results.items[0].contentDetails.duration.replace("PT","").replace("H",":").replace("M",":").replace("S","")),
              newTime = Math.ceil(duration * 0.3),
              hrr = window.location.href,
              mrr = '';
              //console.log(xhr);
              if (hrr.match('&t=')) {
                hrr = hrr.split('&t=') [0];
                if (hrr.split('&t=').length > 1) {
                  mrr = hrr.split('&t=') [1];
                  hrr += (mrr.match('&')) ? '&' + mrr.split('&') [1] : '';
                }
              }
              if (hrr.match('#')) {
                window.location = (hrr.split('#') [0] + '#t=' + newTime + 's');
              } else {
                window.location = (hrr + '#t=' + newTime + 's');
              }
            }
          }
        }
      });
    }
  }
  
  function toggle_cl(element, toggleClass, state){
    if(state || (!element.classList.contains(toggleClass) && (state === undefined))){
      element.classList.add(toggleClass);
    }else{
      element.classList.remove(toggleClass);
    }
  }
  
  function pp_state(event) {
    var t_loc = window.location,
    yt_wadsworth = GM_getValue('yt_wadsworth', false);
    if (c_loc !== t_loc.search || !loaded) {
      if (!loaded) loaded = true;
      if (yt_wadsworth) {
        ww_apply(true);
        // history changed because of pushState/replaceState
      }
    }
  }
  
  function ww_switch() {
    var yt_wadsworth = GM_getValue('yt_wadsworth', false);
    GM_setValue('yt_wadsworth', !yt_wadsworth);
   document.querySelector('#switch_wadsworth').textContent = 'Switch is ' + (!yt_wadsworth ? 'On' : 'Off');
    ww_apply(!yt_wadsworth);
  }
  
  function hide_ww(initial) {
    var yt_wadsworth_h = GM_getValue('yt_wadsworth_h', false);
    GM_setValue('yt_wadsworth_h', !yt_wadsworth_h);
    yt_wadsworth_h = GM_getValue('yt_wadsworth_h', false);
    toggle_cl(document.querySelector('#block_wadsworth'),'show', yt_wadsworth_h);
    toggle_cl(document.querySelector('#block_wadsworth'),'hide', !yt_wadsworth_h);
    document.querySelector('#hide_wadsworth').textContent = '' + (!yt_wadsworth_h ? 'Show' : 'Hide');
  }
  
  function load_once() {
    if (loaded) return;
    
    var yt_wadsworth = GM_getValue('yt_wadsworth', false), bl_ww, sw_ww, hd_ww, ap_ww, cont_yt = document.querySelector('#content');
    var yt_wadsworth_h = GM_getValue('yt_wadsworth_h', false);
    
    cont_yt.insertAdjacentHTML('beforebegin','<style type="text/css">.hide > div,.hide > div.text{display: none;}.show > div,.hide > #hide_wadsworth{display: inline-block;}.show > div.text {display: block;}#block_wadsworth{background-color: rgb(255, 255, 255); display: block; padding: 4px; position: fixed; z-index: 99; margin: 0;}.button_ww{display: inline-block; border: 1px solid red; cursor: pointer; background: none repeat scroll 0% 0% rgb(204, 204, 204); color: black; z-index: 12; padding: 4px 6px; position: relative; margin-top: 3px;margin-right: 3px;}</style><div id="block_wadsworth" class="' + (yt_wadsworth_h ? 'show' : 'hide') + '"><div class="text">Wadsworth Constant: </div><div id="apply_wadsworth" class="button_ww">Apply</div><div id="switch_wadsworth" class="button_ww">Switch is ' + (yt_wadsworth ? 'On' : 'Off') + '</div><div id="hide_wadsworth" class="button_ww">' + (!yt_wadsworth_h ? 'Show' : 'Hide') + '</div></div>');
    
    if (!window.location.href.match('v=') && !window.location.href.match('#p')) {
      bl_ww = document.querySelector('#block_wadsworth');
      bl_ww.parentNode.removeChild(bl_ww);
    }
    
    pp_state();
    
    sw_ww = document.querySelector('#switch_wadsworth');
    sw_ww.addEventListener('click', ww_switch, false);
    
    hd_ww = document.querySelector('#hide_wadsworth');
    hd_ww.addEventListener('click', hide_ww, false);
    
    ap_ww = document.querySelector('#apply_wadsworth');
    ap_ww.addEventListener('click',  function () {
      ww_apply(true);
    }, false);

  }
  document.addEventListener('DOMContentLoaded', load_once);
  window.addEventListener('spfdone', pp_state);
  //window.addEventListener('popstate', pp_state);
}) ();