/**
 * Dokuwki Survey Plugin Frontend Script
 */

function Dokuwiki_Survey(surveyId, surveyConfig) {

    this.surveyId = surveyId;
    this.surveyConfig = surveyConfig;

    // Skip root

    this.currentSurvey = this.surveyConfig._children[0];
    this.currentSurvey.lastSurvey = this.surveyConfig;

};

Dokuwiki_Survey.prototype.goToSurvey = function (childId) {

    var tmpLastSurvey;

    if (childId == -1) {

        this.currentSurvey = this.currentSurvey.lastSurvey;

    } else {

        tmpLastSurvey = this.currentSurvey;

        this.currentSurvey = this.currentSurvey._children[childId]._children[0];
        this.currentSurvey.lastSurvey = tmpLastSurvey;

    }

    this.makeSurvey();

};

Dokuwiki_Survey.prototype.makeSurvey = function () {

    var answerHtml,
        lastSurvey,
        surveyElement,
        surveyConfig,
        surveyQuestion,
        surveyAnswers,
        currentAnswer;

    surveyConfig = this.currentSurvey;

    surveyElement = document.getElementById("survey_" + this.surveyId);
    lastSurvey = surveyElement.getElementsByClassName("lastSurvey")[0];
    surveyQuestion = surveyElement.getElementsByClassName("surveyQuestion")[0];
    surveyAnswers = surveyElement.getElementsByClassName("surveyAnswers")[0];

    if (surveyConfig.lastSurvey._name !== "root") {

        lastSurvey.onClick = "survey[this.surveyId].goToSurvey(-1)";
        lastSurvey.innerHTML = "<p onClick=\"" +
            "survey[" +
            this.surveyId +
            "].goToSurvey(-1)\">" +
            this.lang.back +
            "</p>\n";

        lastSurvey.style.display = "block";

    } else {

        lastSurvey.innerHTML = "";
        lastSurvey.style.display = "none";

    }

    surveyQuestion.innerHTML = surveyConfig._name;
    answerHtml = "<ul>";

    for (currentAnswer in surveyConfig._children) {

        if (surveyConfig._children.hasOwnProperty(currentAnswer)) {

            if (surveyConfig._children[currentAnswer]["_hasChildren"]) {

                answerHtml = answerHtml +
                    "  <li onClick=\"" +
                    "survey[" +
                    this.surveyId +
                    "].goToSurvey(" +
                    currentAnswer +
                    ")\">" +
                    surveyConfig._children[currentAnswer]["_name"] +
                    "</li>\n";
            } else {

                answerHtml = answerHtml +
                    "  <li>" +
                    surveyConfig._children[currentAnswer]["_name"] +
                    "</li>\n";

            }
        }

    }

    answerHtml = answerHtml + "</ul>";

    surveyAnswers.innerHTML = answerHtml;

};