Adds the ability to sort reviews on GoG by a number of criteria

reviewFilter.user.js

// ==UserScript==
// @name         GoG Reviews Filter
// @namespace    https://gist.github.com/adaliabooks/
// @version      1.2
// @description  Adds the ability to sort reviews on GoG by a number of criteria
// @author       adaliabooks
// @updateURL    https://gist.github.com/adaliabooks/3dd8624a2dd72a7209fe/raw/
// @downloadURL  https://gist.github.com/adaliabooks/3dd8624a2dd72a7209fe/raw/
// @require      https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js
// @grant        none
// @include      http://www.gog.com/game/*
// @include      https://www.gog.com/game/*
// ==/UserScript==

setTimeout(function(){
var versionNumber = 1.2;
    
var reviewsAngularScope = angular.element(document.getElementById('reviews')).scope();
var reviewFactory = angular.element(document.getElementById('reviews')).injector().get('reviewFactory');

var reviewsURL = window.location.protocol + '//www.gog.com/reviews/product/' + gogData.gameProductData.id + '.json';
var reviewsTotalPages = gogData.gameProductData.reviews.totalPages;
var currentPage = 1;
gogData.reviews.pages = [];
//gogData.gameProductData.reviews.pages = [];

$(".reviews__header").append('<div style="float: right">Reviews Per Page <select id="reviewsPerPage" style="margin-right: 10px"><option value="5" selected="">5</option><option value="10">10</option><option value="15">15</option><option value="20">20</option><option value="50">50</option><option value="0">All</option></select>Sort Order <select id="sortOrder" style=""><option value="date" selected="">Date</option><option value="helpfulness">Helpfulness</option><option value="stars">Stars</option><option value="length">Length</option></select><div><span style="float: right">Version: ' + versionNumber + '</span></div></div><br>Total Reviews: ' + reviewsAngularScope.totalResults);
    
var allReviewsArray = [];

function sortByDateInner (a, b)
{
    return (a.added < b.added) ? 1 : (a.added > b.added) ? -1 : 0;
}

function sortByHelpfulnessInner (a, b)
{
    var aHelpfulness = 0;
    var bHelpfulness = 0;
    if (a.totalVotes != 0)
    {
        aHelpfulness = (a.helpfulVotes * a.helpfulVotes) / a.totalVotes;
    }
    if (b.totalVotes != 0)
    {
        bHelpfulness = (b.helpfulVotes * b.helpfulVotes) / b.totalVotes;
    }
    return (aHelpfulness < bHelpfulness) ? 1 : (aHelpfulness > bHelpfulness) ? -1 : 0;
}

function sortByStarsInner (a, b)
{
    return (a.rating < b.rating) ? 1 : (a.rating > b.rating) ? -1 : 0;
}
    
function sortByLengthInner (a, b)
{
    return (a.description.length < b.description.length) ? 1 : (a.description.length > b.description.length) ? -1 : 0;
}

function sortByDate (a, b)
{
    var result = sortByDateInner(a, b);
    if (result == 0)
    {
        result = sortByHelpfulnessInner(a, b);
        if (result == 0)
        {
            result = sortByStarsInner(a, b);
        }
    }
    return result;
}

function sortByHelpfulness (a, b)
{
    var result = sortByHelpfulnessInner(a, b);
    if (result == 0)
    {
        result = sortByDateInner(a, b);
        if (result == 0)
        {
            result = sortByStarsInner(a, b);
        }
    }
    return result;
}

function sortByStars (a, b)
{
    var result = sortByStarsInner(a, b);
    if (result == 0)
    {
        result = sortByHelpfulnessInner(a, b);
        if (result == 0)
        {
            result = sortByDateInner(a, b);
        }
    }
    return result;
}
    
function sortByLength (a, b)
{
    var result = sortByLengthInner(a, b);
    if (result == 0)
    {
        result = sortByHelpfulnessInner(a, b);
        if (result == 0)
        {
            result = sortByDateInner(a, b);
        }
    }
    return result;
}

function sortReviewsArray() 
{
  var sortOrder = $("select#sortOrder option:selected").val();
  switch (sortOrder) {
      case "date":
          allReviewsArray.sort(sortByDate);
          break;
      case "helpfulness":
          allReviewsArray.sort(sortByHelpfulness);
          break;
      case "stars":
          allReviewsArray.sort(sortByStars);
          break;
      case "length":
          allReviewsArray.sort(sortByLength);
          break;
      default:
          allReviewsArray.sort(sortByDate);
          break;
}
}

function updatePage()
{
    var reviewsPerPage = $("select#reviewsPerPage option:selected").val();
    if (reviewsPerPage != 0)
    {
        reviewsAngularScope.reviews = allReviewsArray.slice((reviewsAngularScope.currentPage - 1) * reviewsPerPage, (reviewsAngularScope.currentPage * reviewsPerPage));
        reviewsAngularScope.totalPages = Math.ceil(parseInt(reviewsAngularScope.totalResults) / reviewsPerPage);
        gogData.reviews.totalPages = reviewsAngularScope.totalPages;
        gogData.gameProductData.reviews = reviewsAngularScope.totalPages;
    }
    else
    {
        reviewsAngularScope.reviews = allReviewsArray;
        reviewsAngularScope.totalPages = 1;
        gogData.reviews.totalPages = reviewsAngularScope.totalPages;
        gogData.gameProductData.reviews = reviewsAngularScope.totalPages;
    }
    //reviewsAngularScope.$apply();
    reviewsAngularScope.$evalAsync( function (reviewsAngularScope) {
        //console.log("$evalAsync");
    });
}
    
function changeReviewsPerPage()
{
    reviewsAngularScope.currentPage = 1;
    updatePage();
}

function updateReviews()
{
    sortReviewsArray();
    reviewsAngularScope.currentPage = 1;
    updatePage();
}

$('select#reviewsPerPage').on('change', changeReviewsPerPage);

$('select#sortOrder').on('change', updateReviews);

reviewsAngularScope.$watch(
  function() { return reviewsAngularScope.currentPage; },
  function(newValue, oldValue) {
      updatePage();
  }
);
    
reviewsAngularScope.$watch(
  function() { return reviewsAngularScope.reviews; },
  function(newValue, oldValue) {
      if (newValue[0] != oldValue[0])
      {
          //console.log("Reviews Changed");
          updatePage();
      }
  }
);

reviewsAngularScope.$watch(
  function() { return reviewsAngularScope.totalPages; },
  function(newValue, oldValue) {
    var reviewsPerPage = $("select#reviewsPerPage option:selected").val();
      if (reviewsAngularScope.reviews.length != reviewsPerPage)
      {
          //console.log("Total Pages updated");
          updatePage();
      }
  }
);

$(document).off('ajaxStop');
    $( document ).ajaxStop(function() {
        updateReviews();
    });

for (var i = 1; i <= reviewsTotalPages; i++)
{
    var reviewPageURL = reviewsURL + '?page=' + i;
    $.getJSON(reviewPageURL, function( data ) {
        for (var i = 0; i < data.reviews.length; i++)
        {
            allReviewsArray.push(reviewFactory.create(data.reviews[i]));
        }
        //allReviewsArray.push.apply(allReviewsArray, data.reviews)
    });
}
},1);