//////////////////////
/* HELPER FUNCTIONS */
//////////////////////

function hasClass(ele,cls) {
    if (ele.className)
        return ele.className.match(new RegExp('(\\s|^)'+cls+'(\\s|$)'));
}
 
function addClass(ele,cls) {
    if (!this.hasClass(ele,cls)) ele.className += " "+cls;
}
 
function removeClass(ele,cls) {
    if (hasClass(ele,cls)) {
        var reg = new RegExp('(\\s|^)'+cls+'(\\s|$)');
        ele.className=ele.className.replace(reg,' ');
    }
}

//////////////////////////
/* END HELPER FUNCTIONS */
//////////////////////////

//////////////////////
/* CREATE FUNCTIONS */
//////////////////////

function createQuestionEditor() {
    // Outer div
    var editorElement = ce("div");
    this.className = "smallFrame questionEditor";
    editorElement.id = sequencer.state.selectedObject.uid;
    // Header
    var titleDiv = ce("div");
    titleDiv.className = "smallTitle";
    var numberDiv = ce("div");
    numberDiv.className = "listNumber";
    numberDiv.innerHTML = "4";
    var nameSpan = ce("span");
    nameSpan.innerHTML = "New question";
    titleDiv.appendChild(numberDiv);
    titleDiv.innerHTML += "Editing: ";
    titleDiv.appendChild(nameSpan);
    editorElement.appendChild(titleDiv);
    
    //Content area
    var contentDiv = ce("div");
    contentDiv.className = "content";
    var bodyText = createNewElement("textarea", null, "qBodyTextField", "qBodyTextField", null);
    bodyText.value = "Question body text goes here";
    
    
    // The dynamic questionParams div, where all the control elements and inputs will be located
    var questionParams = ce("div");
    questionParams.className = "questionParams";
    contentDiv.appendChild(bodyText);
    var qIdentField = createNewElement("input", "text", "qIdentField", "questionParamField", null);
    var qIdentField_lbl = createNewInputLabel("Question code:","qIdentField", "l");
    questionParams.appendChild(qIdentField_lbl);
    questionParams.appendChild(qIdentField);
    
    var qTypeField = createNewElement("select", null, "qTypeField", "questionParamField", null);
    var qTypeField_lbl = createNewInputLabel("Answer type:","qTypeField", "l");
    questionParams.appendChild(qTypeField_lbl);
    questionParams.appendChild(qTypeField);
    qTypeField.addEventListener("change", function(){
        debugger;
        selectAnswerType();
    }, false);
    // Add the select options. Do this in a block scope to prevent the o1 var from messing things up. 
    // Also helps in structuring code.
    {
        var o1 = ce("option");
        o1.value = null;
        o1.text = "";
        qTypeField.appendChild(o1);
        
        o1 = ce("option");
        o1.value = "int";
        o1.text = "Integer";
        qTypeField.appendChild(o1);
        
        o1 = ce("option");
        o1.value = "scale";
        o1.text = "Scale";
        qTypeField.appendChild(o1);
        
        o1 = ce("option");
        o1.value = "choice";
        o1.text = "Multiple choice";
        qTypeField.appendChild(o1);
        
        o1 = ce("option");
        o1.value = "text";
        o1.text = "Text";
        qTypeField.appendChild(o1);
    }
    
    contentDiv.appendChild(questionParams);
    editorElement.appendChild(contentDiv);
    
    // Controls bar
    var controlsDiv = ce("div");
    controlsDiv.className = "controls";
    var btnDiscard = createNewElement("input", "button", "btnDiscard", null, "Discard");
    var btnSave = createNewElement("input", "button", "btnSave", null, "Save");
    controlsDiv.appendChild(btnDiscard);
    controlsDiv.appendChild(btnSave);
    btnSave.addEventListener("click", function(){
        swapQuestionState(true);
    }, false);
    btnDiscard.addEventListener("click", function(){
        swapQuestionState(false);
    }, false);
    editorElement.appendChild(controlsDiv);
    
    return editorElement;
}

function swapQuestionState(save) {
    // Function that replaces a question display with the question editor, or vice versa.
    if (sequencer.state.editing == false) {
        // Start editing
        sequencer.state.editing = true;
        var questionElement = ge(sequencer.state.selectedObject.uid);
        // test
        var editor = new QuestionEditor();
        editor.init();
        // end test
        //var editorElement = createQuestionEditor();
        var content = ge("seqContentWrapper");
        content.replaceChild(editor.element, questionElement);
    }
    else {
        
        if (save) {
            if (save == true) {
                alert("Saving shit yo!");
            // User is done editing
            // 1. Create the edited question in db (createObject.php), then set the proper properties (saveObject.php)
            // 2. Revert back to question display
            }
            else {
                // Anders discard gewoon alles en haal de question display weg.
                ge("seqContentWrapper").removeChild(ge(sequencer.state.selectedObject.uid));
            }
        }
    
    }
}


//////////////////////////
/* END CREATE FUNCTIONS */
//////////////////////////

var qUID, parentObjectUID, qName, qTag, qType, qAnswerLength;

function selectAnswerType(){
    var selectBox = document.getElementById("qTypeField");
    if (selectBox.value != undefined && selectBox.value != "") {
        qType = selectBox.value;
    }
    else {
        return;
    }
    removeWrongAnswerFields(selectBox);
    switch (qType) {
        case "int":
            selectIntType();
            break;
        case "scale":
            selectScaleType();
            break;
        case "choice":
            //selectChoiceType();
            break;
        case "text":
            //selectTextType();
            break;
        default:
            alert("Invalid answer type selected!");
            break;
    }
    
}

function createNewElement(tag, type, id, cl, value) {
    // This is a double of the ce() alias function in generalScripts.js. 
    // It allows for more specific creation of elements on one line, 
    // instead of 5 subsequent lines of code defining tag, id, class, value, etc...
    // This is handy when doing creation-heavy operations such as adding inputs
    //!!! Since this is defined in questionEditorScripts.js, it should only be used in this context.
    //!!! Use ce() whenever possible, since it's included on every page and works faster.
    
    var newElement = document.createElement(tag);
    if (type != undefined) newElement.type = type;
    if (id != undefined) newElement.id = id;
    if (cl != undefined) newElement.className = cl;
    if (value != undefined) {
        newElement.value = value;
        newElement.text = value;
    }
    return newElement;
}

function createNewInputLabel(text, target, align) {
    var newLabel = document.createElement("label");
    if (target) newLabel.setAttribute("for",target);
    if (align) newLabel.className = "questionParamLabel "+align+"Align"; else newLabel.className="questionParamLabel";
    newLabel.innerHTML = text;
    return newLabel;
}

function removeWrongAnswerFields(el) {
    while (el.nextSibling) {
        el.parentNode.removeChild(el.nextSibling);
    }
}

function updateIdentifier() {
    var identField = document.getElementById("questionIdentifierField");
    if (identField.value == undefined && identField.value == "") {
        return;
    }
    var headerField = document.getElementById("header_identifier");
    headerField.innerHTML = identField.value;
}


///////////////////
/* INT SELECTION */
///////////////////

function selectIntType() {
    var selectBox = document.getElementById("questionType");
    var content = document.getElementById("questionEditor_questionParams");
    // Add minimum value input
    var minValueBox = createNewElement("input","text","minValueBox", "questionParamField", null);
    var minValueBoxLabel = createNewInputLabel("Minimum value:", "minValueBox");
    addClass(minValueBoxLabel, "formLineBreak");
    content.appendChild(minValueBoxLabel);
    content.appendChild(minValueBox);
    // Add maximum value input
    var maxValueBox = createNewElement("input", "text", "maxValueBox", "questionParamField", null);
    var maxValueBoxLabel = createNewInputLabel("Maximum value:","maxValueBox");
    addClass(maxValueBoxLabel, "formLineBreak");
    content.appendChild(maxValueBoxLabel);
    content.appendChild(maxValueBox);
}

/////////////////////
/* SCALE SELECTION */
/////////////////////

function selectScaleType() {
    // I heard you like walls of text!
    var content = document.getElementById("questionEditor_questionParams");
    // Add number of choices input
    var numChoicesBox = createNewElement("select", null, "numChoicesBox","questionParamField",null);
    var numChoicesBoxLabel = createNewInputLabel("Scale size:","numChoicesBox");
    for (var i = 0; i < 10; i++) {
        var option = createNewElement("option");
        option.text = i+1;
        option.value = i+1;
        numChoicesBox.appendChild(option);
    }
    addClass(numChoicesBoxLabel, "formLineBreak");
    content.appendChild(numChoicesBoxLabel);
    content.appendChild(numChoicesBox);
    // Add legends enabled input
    var legendsEnabledCheckBox = createNewElement("input","checkbox","legendsEnabledCheckbox","questionParamField",null);
    var legendsEnabledCheckBoxLabel = createNewInputLabel("Enable legends","legendsEnabledCheckBox");
    addClass(legendsEnabledCheckBoxLabel, "formLineBreak");
    content.appendChild(legendsEnabledCheckBoxLabel);
    content.appendChild(legendsEnabledCheckBox);
    // Add legend labels boxes
    var upperLegendBox = createNewElement("input","text","upperLegendBox","questionParamField");
    var lowerLegendBox = createNewElement("input","text","lowerLegendBox","questionParamField");
    var lowerLegendBoxLabel = createNewInputLabel("Lower legend","lowerLegendBox");
    var upperLegendBoxLabel = createNewInputLabel("Upper legend","upperLegendBox");
    addClass(lowerLegendBoxLabel,"formLineBreak");
    content.appendChild(lowerLegendBoxLabel);
    content.appendChild(lowerLegendBox);
    addClass(upperLegendBoxLabel,"formLineBreak");
    content.appendChild(upperLegendBoxLabel);
    content.appendChild(upperLegendBox);
    // Disable these boxes, since the checkbox is unchecked by default
    lowerLegendBox.disabled = true;
    upperLegendBox.disabled = true;
    if (legendsEnabledCheckBox.addEventListener) {
        legendsEnabledCheckBox.addEventListener("click", toggleScaleLegends, true);
    }
}

function toggleScaleLegends() {
    var content = document.getElementById("questionEditor_questionParams");
    var checkbox = document.getElementById("legendsEnabledCheckbox");
    var upperLegendBox = document.getElementById("upperLegendBox");
    var lowerLegendBox = document.getElementById("lowerLegendBox");
    if (checkbox.checked == true) {
        upperLegendBox.disabled = false;
        lowerLegendBox.disabled = false;
    }
    else {
        upperLegendBox.disabled = true;
        lowerLegendBox.disabled = true;
    }
}

///////////////////////////////
/* MULTIPLE CHOICE SELECTION */
///////////////////////////////

function selectChoiceType() {
    var selectionBox = document.getElementById("questionType");
    var content = document.getElementById("questionEditor_questionParams");
}

function resizeTextArea() {
    var textArea = document.getElementById("questionEditor_bodyText");
    if (document.getElementById("hiddenScalingDiv")) {
        var hiddenDiv = document.getElementById("hiddenScalingDiv");
    }
    else {
        var hiddenDiv = document.createElement("div");
        hiddenDiv.style.visibility = "hidden";
        textArea.appendChild(hiddenDiv);
    }
    
    debugger;
    hiddenDiv.innerHTML = "";
    var userText = textArea.firstChild;
    alert(userText);
}


//TEST FUNCTIONS

/*
 * These functions are an attempt at making editors class based, for easier organisation and parameter storage and access.
 * It prevents having to add more question-specific clutter to the sequencer object
 */

function QuestionEditor() {
    // Properties    
    this.uid = null;
    this.element = null;
    this.paramsElement = null;
    
    // Basic functionality
    this.setValues = function(arguments) {
        // Query question information from database, then fill element fields with correct information.
        
    }
    this.init = function() {
        // Outer div
        this.element = ce("div");
        this.element.className = "smallFrame questionEditor";
        this.element.id = sequencer.state.selectedObject.uid;
        this.uid = sequencer.state.selectedObject.uid;
        // Header
        var titleDiv = ce("div");
        titleDiv.className = "smallTitle";
        var numberDiv = ce("div");
        numberDiv.className = "listNumber";
        numberDiv.innerHTML = "4";
        var nameSpan = ce("span");
        nameSpan.id = "qTitleField";
        nameSpan.innerHTML = "New question";
        titleDiv.appendChild(numberDiv);
        titleDiv.innerHTML += "Editing: ";
        titleDiv.appendChild(nameSpan);
        this.element.appendChild(titleDiv);
    
        //Content area
        var contentDiv = ce("div");
        contentDiv.className = "content";
        var bodyText = createNewElement("textarea", null, "qBodyTextField", "qBodyTextField", null);
        bodyText.value = "Question body text goes here";
    
    
        // The dynamic questionParams div, where all the control elements and inputs will be located
        var questionParams = ce("div");
        this.paramsElement = questionParams;
        questionParams.className = "questionParams";
        contentDiv.appendChild(bodyText);
        var qIdentField = createNewElement("input", "text", "qIdentField", "questionParamField", null);
        var qIdentField_lbl = createNewInputLabel("Question code:","qIdentField", "l");
        questionParams.appendChild(qIdentField_lbl);
        questionParams.appendChild(qIdentField);
    
        var qTypeField = createNewElement("select", null, "qTypeField", "questionParamField", null);
        var qTypeField_lbl = createNewInputLabel("Answer type:","qTypeField", "l");
        questionParams.appendChild(qTypeField_lbl);
        questionParams.appendChild(qTypeField);
        qTypeField.addEventListener("change", function(){
            debugger;
            selectAnswerType();
        }, false);
        // Add the select options. Do this in a block scope to prevent the o1 var from messing things up. 
        // Also helps in structuring code.
        {
            var o1 = ce("option");
            o1.value = null;
            o1.text = "";
            qTypeField.appendChild(o1);
        
            o1 = ce("option");
            o1.value = "int";
            o1.text = "Integer";
            qTypeField.appendChild(o1);
        
            o1 = ce("option");
            o1.value = "scale";
            o1.text = "Scale";
            qTypeField.appendChild(o1);
        
            o1 = ce("option");
            o1.value = "choice";
            o1.text = "Multiple choice";
            qTypeField.appendChild(o1);
        
            o1 = ce("option");
            o1.value = "text";
            o1.text = "Text";
            qTypeField.appendChild(o1);
        }
    
        contentDiv.appendChild(questionParams);
        this.element.appendChild(contentDiv);
    
        // Controls bar
        var controlsDiv = ce("div");
        controlsDiv.className = "controls";
        var btnDiscard = createNewElement("input", "button", "btnDiscard", null, "Discard");
        var btnSave = createNewElement("input", "button", "btnSave", null, "Save");
        controlsDiv.appendChild(btnDiscard);
        controlsDiv.appendChild(btnSave);
        btnSave.addEventListener("click", function(){
            swapQuestionState(true);
        }, false);
        btnDiscard.addEventListener("click", function(){
            swapQuestionState(false);
        }, false);
        this.element.appendChild(controlsDiv);
        var request = {
            "uid": this.uid,
            "type": "Question"
        }
        var requestString = "args="+JSON.stringify(request);
        newAjaxRequest(requestString, "returnObjectDisplay.php", function(result){
            // Fill in the element with the correct values
            // Result is sent to setValues in object form already, perhaps better idea to send in string format and parse within the target method?
            this.setValues(JSON.parse(result.responseText));
        }, true);
    }
    this.submit = function() {
        var request = {
            "title": ge("qTitleField").value,
            "type": ge("qTypeField").value
        }
        
        newAjaxRequest(requestString, "createObject.php", function(result){
            // Display a success message, or throw an error.
        }, true);
    }
    
    // Updating input fields
    this.selectAnswertype = function () {
        // Switch statement, call this.type_x where x is the relevant answer type.
        // For all this.type_X funtions:
        // Use the createNewElement and createNewInputLabel methods to add controls or input fields.
        // Input field convention:  class = questionParamField, id = qTypeField / qScaleSize, etc...
        // Input label class: "l" or "r" depending on alignment with respect to parent ("for") input element.
        // Important: use the this.paramsElement to access the questionParams div!
        // To fully make use of this class-based approach, the editor should be added to a global variable. This global variable should be removed on page unload!
    }
    this.type_Scale = function () {
        
    }
    this.type_Integer = function () {
        
    }
    this.type_Text = function () {
        
    }
    this.type_Choice = function() {
        
    }
    
}

function newEditor() {
    // Get variables, ofc not null...
    var arguments = null;
    var editor = new QuestionEditor(arguments);
    editor.setValues(arguments);
    ge("seqContentWrapper").appendChild(editor.element);
// Etc. We can put the switchModes() command in here as well, I'd say...
// Or should that be in the QuestionEditor class? That's probably better, since it has direct access to all the internal variables.
}

function startEditingQuestion(uid) {
    if (sequencer.state.editing == true) return;
    
    var element = ge(uid);
    var editor = new QuestionEditor();
    var newElement = editor.createElement();
    // Query parameters
    editor.setValues(parameters);
    element.parentNode.replaceChild(newElement, element);
    sequencer.state.editing = true;
}