Cleverflow (with audio) 2.5

// ==UserScript==
// @name Cleverflow (with audio)
// @namespace http://waniiikaniii.com/
// @include http://www.wanikani.com/review/session
// @version 2.5
// @grant GM_addStyle
// @grant GM_getResourceText
// @run-at document-end
// @require http://code.jquery.com/jquery-1.9.1.min.js
// ==/UserScript==

//This is the timer that dictates how quickly to check for a new item to update the 'last item' button
var timer_showNextItem = 350;

//AUDIO SETTINGS
//This toggles the audio on or off: ON = 1, OFF = 0
var playAudioWhenAvailable = 1;
//This is the timer that dictates how long it gives the audio to play before moving on to the next item
var timer_audioPlayTime = 1500;


var lastItem = "";
var lastType = "";
var saved_lastType = "";
var saved_lastItem = "";
var saved_currentItem="";
var currentItem = "";
var currentType = "";
var previousItem = "";
var previousType = "";
var previousItemURL = "";
var submittedAnswer = "";
var previousCorrect = false;

function reviewLoaded()
{
    if ($('#loading').is(':visible'))
    {
        console.log('Initial load in progress...');
        setTimeout(reviewLoaded, 250);
    }
    else
    {
        $('<li id="option-show-previous"><span title="Check previous item"><i class="icon-question-sign"></i></span></li>').insertBefore('#option-last-items').addClass('disabled');
        $('#additional-content ul').css('text-align','center');
        $('#additional-content ul li').css('width','16%');
        console.log('Initial load finished');
    }
}

function checkAnswer()
{
    previousItem = $.trim($('#character span').html());
    previousType = $('#character').attr('class');

    console.log('previousItem: ' + previousItem);
    console.log('previousType: ' + previousType);

    if($('#answer-form form fieldset').hasClass('correct'))
    {
        previousCorrect = true;
        console.log('Correct answer. Moving to the next item.');
        $('#option-show-previous span').css('background-color', '#FBFBFB');
    }
    else if($('#answer-form form fieldset').hasClass('incorrect'))
    {
        previousCorrect = false;
        console.log('Wrong answer. We will move to the next item and change the button color to red');
        $('#option-show-previous span').css('background-color', '#FF8E8E');
    }

    if (playAudioWhenAvailable == 1)
    {
        playAudioThenMove();
    }
    else
    {
        moveToNextItem();
    }
}

function playAudioThenMove()
{
    console.log('Attempting to play audio clip before advancing');
    if ($("#option-audio").attr('class') != "disabled")
    {
        $("#option-audio").click();
        setTimeout(moveToNextItem, timer_audioPlayTime);
    }
    else
    {
        moveToNextItem();
    }
}

function moveToNextItem()
{
    $('#answer-form button').click();

    currentItem = $.trim($('#character span').html());
    currentType = $('#character').attr('class');

    console.log('currentItem: ' + currentItem);
    console.log('currentType: ' + currentType);

    if(previousItem != currentItem)
    {
        $('#option-show-previous').off("click");

        if(previousItem == '')
        {
            $('#option-show-previous').addClass('disabled');
            $('#option-show-previous span').attr('title', 'Previous item unavailable').html('<i class="icon-question-sign"></i> ' + previousItem);
            console.log('lastItem: Previous item unavailable');
        }
        else
        {
            $('#option-show-previous').removeClass('disabled');

            if(previousCorrect === true)
                $('#option-show-previous span').attr('title', 'Check the previous ' + previousType).html('<i class="icon-question-sign"></i> ' + previousItem);
            else
                $('#option-show-previous span').attr('title', 'You answered ' + submittedAnswer).html('<i class="icon-question-sign"></i> ' + previousItem);

            previousItemURL = 'http://www.wanikani.com/';

            if (previousType == 'kanji')
            {
                    previousItemURL += 'kanji/' + previousItem + '/';
            }
            else if (previousType == 'vocabulary')
            {
                    previousItemURL += 'vocabulary/' + previousItem + '/';
            }
            else
            {
                    previousItemURL += 'radicals/' + submittedAnswer.toLowerCase().replace(' ', '-') + '/';
            }
            console.log('previousItemURL: ' + previousItemURL);

            $('#option-show-previous').on("click", function(event){ window.open(previousItemURL); });
        }
    }
}

$(document).keyup(function(e) {
    code = (e.keyCode ? e.keyCode : e.which);
    if(code == 13)
    {
        submittedAnswer = $('#user-response').val();
        console.log('submittedAnswer: ' + submittedAnswer);

        setTimeout(checkAnswer, timer_showNextItem);
    }
});

reviewLoaded();