/* 
 * Scripts needed for operation of the survey editor
 */

var surveyEditor = {
    uid: "",                        // the uid of the currently opened survey
    title: "No title",         // the name of the currently opened survey
    description: "No description",  // the description of the currently opened survey
    numQuestions: 0,                // the number of questions contained in this survey
    questions: [],             // the array containing question objectliterals/uids
    state: {                        // used for checks in onClick events
        editing: false,             // whether or not a question is currently being edited
        editUid: ""                 // the uid of the question being edited, if any
    }
}

// Deze scripts worden gedeeld door bijna alle editors, en deze moeten dan ook in een common scripts
// file komen te staan in plaats van in elk document weer opnieuw invoeren.
// Dit gaat ongetwijfeld conflicten opleveren als er in een van de functies iets veranderd moet worden.

function stringToArray(s, c) {
    var a = s.split(c);
    for (var i = 0; i < a.length; i++) {    // remove empty items
        if (a[i] == "") {
            a.splice(i, 1);
            i--;
        }
    }
    return a;
}

function arrayToString(a, c) {
    var s = "";
    for (var i = 0; i < a.length; i++) {
        if (a[i] != "") {
            s += a[i]+c;
        }
    }
    return s;
}



function loadSurvey() {
    
    /*
     * Take the values from the hiddenfields on the page, load them into the object literal defined at the top of this script,
     * Then delete these fields from the HTML page, since they are not needed anymore.
     * This is possibly more secure than leaving them on the page, and results in cleaner HTML markup
     */

    debugger;
    var fTitle = document.getElementById("surveyTitle");
    if (fTitle != undefined && fTitle.value != "") {
        surveyEditor.title = fTitle.value;
    }
    else {
        surveyEditor.title = "Undefined title";
    }
    
    var fNumQuestions = document.getElementById("numQuestions");
    if (fNumQuestions != undefined && fNumQuestions.value != "") {
        surveyEditor.numQuestions = fNumQuestions;
    }
    else {
        surveyEditor.numQuestions = 0;
        return;
    }
    
    var fQuestions = document.getElementById("questionUids");
    if (fQuestions != undefined && surveyEditor.numQuestions > 0) {
        surveyEditor.questions = stringToArray(fQuestions.value, ",");
        if (surveyEditor.questions.length != surveyEditor.numQuestions) {
            alert("numQuestions and the questions array passed do not match!");
            return;
        }
    }
    else {
        alert("Questions field not found!");
        return;
    }
}

function drawQuestions(firstTime) {
    var length = surveyEditor.questions.length;
    if (length <= 0) return;
    
    var container = document.getElementById("surveyEditorContent");
    
    
    if (firstTime == true) {
        // Loop through questions, add a new smallFrame div for each question with id=question->uid
        // do this via AJAX calls, returnQuestion.php
        // dependencies: stringToArray/arrayToString
        var requestString = "uids=";
        requestString += arrayToString(surveyEditor.questions, ",");
        newAjaxRequest(requestString, "returnQuestionDisplay.php", function(result) {
            //var holderDiv = document.createElement("div");
            //holderDiv.innerHTML = result.responseText;
            container.innerHTML = result.responseText;
        });
    }
    
    
}