// ==UserScript==
// @name         It's learning test filler
// @namespace    http://tyilo.com/
// @version      0.1
// @description  enter something useful
// @include      https://aarhustech.itslearning.com/Ntt/TestTool/TakeTest.aspx*
// @include      https://aarhustech.itslearning.com/Ntt/EditTool/ViewTest.aspx*
// @run-at       document-end
// @copyright    2011+, Asger Drewsen
// ==/UserScript==
/*  Globals  */

var save, testID, currentQuestionID, loading, NOID = 'noID';

/* Settings  */

var fast = true;

/*NodeList.prototype.toArray = function()
{
var array = [];
for(var i = 0; i < this.length; i++)
{
array.push(this[i]);
}
return array;
};*/
function insertAnswers()
{
    if(!save[testID]['questions'][currentQuestionID])
    {
        return;
    }
    var question = save[testID]['questions'][currentQuestionID];
    var inputs = document.getElementById('qti-choiceinteraction-container').getElementsByTagName('input');
    for(var k = 0; k < inputs.length; k++)
    {
        inputs[k].value = question['answers'][k];
        inputs[k].style.backgroundColor = ((question['correct'] == 2)? 'lime': ((question['correct'] == 1)? 'silver': 'red'));
    }
}
function parseResults(evt)
{
    var resultDOM = evt.target.contentWindow.document;
    var answersContainers = resultDOM.getElementsByClassName('NTT_studentReport_RegularRow');
    for(var i = 0; i < answersContainers.length; i++)
    {
        var spans = resultDOM.getElementById('ctl30_' + (i + 1) + '_ctl01_ctl00_fullTextContent').getElementsByTagName('span');
        var questionID;
        if(spans.length == 2)
        {
            questionID = NOID;
        }
        else
        {
            questionID = spans[0].id;
        }
        if(!save[testID]['questions'][questionID])
        {
            save[testID]['questions'][questionID] = {'correct': 0, 'answers': []};
        }
        var correct = (answersContainers[i].getElementsByClassName('NTT_correctAnswer').length? 2: (answersContainers[i].getElementsByClassName('NTT_partlyCorrectAnswer').length? 1: 0));
        if(save[testID]['questions'][questionID]['correct'] > correct)
        {
            continue;
        }
        save[testID]['questions'][questionID]['correct'] = correct;
        if(save[testID]['questions'][questionID]['answers'].length)
        {
            save[testID]['questions'][questionID]['answers'] = [];
        }
        var answers = answersContainers[i].getElementsByClassName('qti-simple-blank');
        for(var j = 0; j < answers.length; j++)
        {
            save[testID]['questions'][questionID]['answers'].push(answers[j].innerText);
        }
        if(currentQuestionID == questionID)
        {
            insertAnswers();
        }
    }
    GM_setValue('save', save);
}
function loadIframes(urls, callback)
{
    if(typeof urls == 'string')
    {
        urls = [urls];
    }
    if(fast)
    {
        urls = [urls.pop()];
    }
    for(var i = 0; i < urls.length; i++)
    {
        var resultIframe = document.createElement('iframe');
        resultIframe.src = urls[i];
        //resultIframe.style.display = 'none';
        resultIframe.onload = callback;
        document.body.appendChild(resultIframe);
    }
}
function parseAttempts(attempts)
{
    var urls = [];
    for(var i = 0; i < attempts.length; i++)
    {
        var match = /TestResultId=([^&]*)/.exec(attempts[i].onclick);
        if(match)
        {
            var testResultID = match[1];
            urls.push('https://aarhustech.itslearning.com/Ntt/EditTool/ShowResult.aspx?TestResultId=' + testResultID);
        }
    }
    return urls;
}
function parseTestOverview(DOM)
{
    console.log(save);
    save[testID]['lastCheck'] = Date.now();
    var attempts = DOM.getElementsByClassName('answered');
    if(attempts.length == 0)
    {
        save[testID]['attempts'] = undefined;
        save[testID]['lastAttempt'] = undefined;
        save[testID]['lastAttempts'] = undefined;
        save[testID]['updated'] = false;
    }
    else if(save['lastAttempts'] || save['lastAttempts'] < attempts.length)
    {
        save[testID]['attempts'] = parseAttempts(attempts);
        var dateString = attempts[attempts.length - 1].innerText
            var dateTime = dateString.split(' ');
        var date = dateTime[0].split('-');
        var time = dateTime[1].split(':');
        save[testID]['lastAttempt'] = (new Date(date[2], date[1] - 1, date[0], time[0], time[1])).getTime();
        save[testID]['lastAttempts'] = attempts.length;
        save[testID]['updated'] = false;
    }
    else
    {
        save[testID]['updated'] = true;
    }
    GM_setValue('save', save);
    console.log(save);
    return attempts;
}
function update()
{

    loadIframes('https://aarhustech.itslearning.com/Ntt/EditTool/ViewTest.aspx?TestID=' + testID, function(evt)
    {
        var resultsDOM = evt.target.contentWindow.document;
        var attempts = parseTestOverview(resultsDOM);
        loadIframes(parseAttempts(attempts), parseResults);
    });
}
var match = /\/([^\/]*)\.aspx\?.*TestID=([^&]*)/.exec(window.location.href);
if(match)
{
    save = GM_getValue('save', {});
/*
Save format:

+ Object save
| + Object   <testID>
| | - Number   lastCheck
| | - Number   lastAttempt
| | - Number   lastAttempts
| | - Boolean  updated
| | - Array    attempts
| | + Object   questions
| | | + Object   <questionID>
| | | | - Number   correct
| | | | - Array    answers
| | | |_______________________
| | |___________________________
| |_______________________________
|___________________________________

*/
    testID = match[2];
    if(!save[testID])
    {
        save[testID] = {};
    }
    if(!save[testID]['questions'])
    {
        save[testID]['questions'] = {};
    }
    switch(match[1])
    {
        case 'ViewTest':
            if(window.top.location.href.indexOf('TakeTest.aspx') == -1)
            {
                parseTestOverview(document);
            }
            break;
        case 'TakeTest':
            var spans = document.getElementsByClassName('qti-wrapper')[0].getElementsByTagName('span');
            if(spans.length == 1)
            {
                currentQuestionID = NOID;
            }
            else
            {
                currentQuestionID = spans[1].id;
            }
            if(!(save[testID]['updated']))  // || Date.now() - save[testID]['lastCheck'] > 24 * 60 * 60 * 1000
            {
                loading = document.createElement('div');
                loading = true;
                if(!save[testID]['attempts'])
                {
                    update(); // Full update
                }
                else
                {
                    loadIframes(save[testID]['attempts'], parseResults); // Cache update
                }
            }
            else
            {
                insertAnswers(); // No update
            }
        break;
    }
}