Kinetic.MultipleChoice = function(config){
	Kinetic.Group.call(this, config);
	this.data = config.data;
	
	// check if multiple answers can be given
	var correctAnswers = this.data.correctAnswers;
	
	this.multipleAnswers = false;
	if (correctAnswers.length > 1){
		this.multipleAnswers = true;
	}
	
	this.initExercise();
	this.createExercise();
	this.eventHandlers();
}

Kinetic.MultipleChoice.prototype = {
	createExercise: function(){
		// question
		var question = new Kinetic.Text({
			'y': 2,
			'text': this.data.question,
			'fontSize': 14,
			'fontFamily': 'Arial',
			'fill': '#000000',
			'width': exerciseSettings.questionWidth
		});
		
		this.add(question);
		
		// answers
		var answerData = this.data.answers;
		
		if (exerciseSettings.shuffleAnswers && eqSettings.forceShuffleAnswersOff != 1){
			answerData = shuffleArray(answerData);
		}
		
		var yPos = question.getHeight() + 30;
		
		this.answers = new Array();
		
		for (var i = 0; i < answerData.length; i++){
			this.answers[i] = new Kinetic.MultipleChoiceAnswer({
				'data': answerData[i],
				'y': yPos
			});
			
			this.add(this.answers[i]);
			
			yPos += this.answers[i].label.getHeight();
		}
	},
	
	eventHandlers: function(){
		var thisObject = this;
		
		for (var i = 0; i < this.answers.length; i++){
			this.answers[i].hitzone.on("mouseup touchend", function(evt){
				if (thisObject.multipleAnswers){
					if (this.getParent().selected){
						this.getParent().setUnselected();
					} else {
						this.getParent().setSelected();
					}
				} else {
					for (var j = 0; j < thisObject.answers.length; j++){
						thisObject.answers[j].setUnselected();
					}
					
					this.getParent().setSelected();
				}
			});
			
			this.answers[i].hitzone.on("mouseover", function(evt){
				this.getParent().setMouseOver();
			});
			
			this.answers[i].hitzone.on("mouseout", function(evt){
			    if (typeof this.getParent() != 'undefined'){
    				this.getParent().setMouseOut();
    			}
			});
		}
	},
	
	checkAnswer: function(){
		this.attempts -= 1;
		
		if (this.attempts == 0){
			this.blockExercise();
		}
		
		var correctAnswers = this.data.correctAnswers;
		
		this.correct = true;
		
		for (var i = 0; i < this.answers.length; i++){
			var selected = this.answers[i].selected;
			
			if ($.inArray(this.answers[i].data.id, correctAnswers) != -1){
				// right answer
				if (selected){
					// mark correct
					if (eqSettings.mode == 'exercise'){
						this.answers[i].setCorrect();
					}
				} else {
					// mark forgot
					if (eqSettings.mode == 'exercise'){
						this.answers[i].setForgot();
					}
					this.correct = false;
				}
			} else {
				// wrong answer
				if (selected){
					// mark wrong
					if (eqSettings.mode == 'exercise'){
						this.answers[i].setWrong();
					}
					this.correct = false;
				}
			}
		}
		
		this.showFeedback(this.correct, this.attempts);
	}
}

Kinetic.Util.extend(Kinetic.MultipleChoice, Kinetic.ExerciseType);