wanikani improve 1.3

// ==UserScript==
// @name WaniKani Improve
// @namespace http://www.michaelfrank.com.br/wanikani_improve/
// @include http://www.wanikani.com/review
// @version 1.3
// @grant GM_addStyle
// @grant GM_getResourceText
// @run-at document-end
// @require http://code.jquery.com/jquery-1.9.1.min.js
// @require http://cdnjs.cloudflare.com/ajax/libs/qtip2/2.1.1/jquery.qtip.min.js
// @resource qtipCSS http://qtip2.com/v/stable/jquery.qtip.min.css
// ==/UserScript==

// time in miliseconds to move to the next item in the review session
// if set too low, the script will not be able to check if the answer was correct
var timer_showNextItem = 50;


var qtipCSS = GM_getResourceText("qtipCSS");
GM_addStyle(qtipCSS);

var currentItem = "";
var currentType = "";
var previousItem = "";
var previousType = "";
var previousItemURL = "";

function reviewLoaded()
{
    if ($('#loading').is(':visible'))
    {
        console.log('Initial load in progress...');
        setTimeout(reviewLoaded, 150);
    }
    else
    {
        $('<li id="option-show-previous"><span title="Check previous item"><i class="icon-question-sign"></i></span></li>').insertAfter('#option-home').addClass('disabled');
        $('<style type="text/css"> .qtip{ max-width: 380px !important; } #additional-content ul li { width: 16% !important; } #additional-content {text-align: center;}</style>').appendTo('head');

        // we check if the key pressed is the ENTER key
        $('#user-response').keydown(function (e){
            if(e.keyCode == 13)
            {
                setTimeout(checkAnswer, timer_showNextItem);
            }
        });

        console.log('Initial load finished');
    }
}

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

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

    if($('#answer-form form fieldset').hasClass('correct'))
    {
        $('#answer-form button').click();
        console.log('Correct answer. Moving to the next item.');
    }
    else
    {
        console.log('Wrong answer. We will not move to the next item.');
    }


    if (currentItem != previousItem)
    {
        currentItem = $.trim($('#character').text());
        currentType = $('#character').attr('class');

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

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

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

            if (previousType == 'kanji')
            {
                    previousItemURL += 'kanji/' + previousItem + '/';
            }
            else if (previousType == 'vocabulary')
            {
                    previousItemURL += 'vocabulary/' + previousItem + '/';
            }
            else
            {
                    previousItemURL += 'radicals/' + previousItem + '/';
            }
        }

        console.log('previousItemURL: ' + previousItemURL);
    }

    $('#option-show-previous').not('.disabled').on('click', function(event) {
         $(this).qtip({
            show: 'click',
            hide: 'unfocus',
            overwrite: true, // Don't overwrite tooltips already bound
            content: {
                title: 'Previous ' + previousType,
                text: '<iframe src="' + previousItemURL + '" frameborder="0" marginheight="0" style="width:350px; height: 250px; overflow-x: hidden; overflow-y: scroll"></iframe>'
            },
            position: {
                my: 'Top Center',
                at: 'Bottom Center',
                viewport: $(window)
            },
            show: {
                event: event.type, // Use the same event type as above
                ready: true // Show immediately - important!
            },
            style: 'qtip-bootstrap'
        });
    });
}

// initial load
reviewLoaded();