currentExerciseNumber = 0;
testId = null;
savingInProgress = 0;
exerciseLoading = false;

function initEQ(){
    if (eqSettings.startAtExercise > 0){
        currentExerciseNumber = eqSettings.startAtExercise;
    }
    
	$.post('eq/index/getproject', {'projectId': 3}, function(data){
		projectData = $.parseJSON(data);
		
		// exercise settings
		var exerciseSettingsData = projectData.settings.exerciseSettings;
		globalExerciseSettings = new Array();
		
		for (var type in exerciseSettingsData){
			globalExerciseSettings[type] = new Array();
			
			for (var i = 0; i < exerciseSettingsData[type].length; i++){
				globalExerciseSettings[type][exerciseSettingsData[type][i]['settingName']] = exerciseSettingsData[type][i]['value'];
			}
		}
		
		drawCanvas();
	});
	
	if (eqSettings.mode == 'test' && eqSettings.saveAnswer){
		// create test
		var chapterId = null;
		if (eqSettings.chapterId > 0){
		    chapterId = eqSettings.chapterId;
		}
		
		$.post('eq/index/createtest', {'chapterId': chapterId}, function(data){
			testId = data;
		});
	}
	
	playerEvents();
}


function playerEvents(){
	if (eqSettings.mode == 'exercise'){
		$('#checkAnswer').show();
		$('#nextTest').hide();
		$('#finishTest').hide();
		$('#showTheory').hide();
		$('#nextExercise').hide();
		$('#backToOverview').hide();
		
		$('#checkAnswer').click(function(){
				if (savingInProgress > 0 || exerciseLoading){
					return false;
				}
				
				if (isCanvasSupported()){
					exercise.checkAnswer();
				}else{
					eqSwf.showSolution();
				}
				$('#checkAnswer').hide();
				$('#showTheory').show();
				if ((parseInt(currentExerciseNumber)+1) < 0){
					$('#nextExercise').show();
				} else {
				    $('#backToOverview').show();
				}
		});
		
		$('#nextExercise').click(function(){
			if (savingInProgress > 0 || exerciseLoading){
				return false;
			}
			
			$('#messageBox').hide();
			$('#nextExercise').hide();
			$('#checkAnswer').show();
			$('#showTheory').hide();
			
			updateProgressBar()
			
			currentExerciseNumber++;
			
			if (isCanvasSupported()){
				loadExercise();
			}else{
				eqSwf.gotoNext();
			}
		});
	} else {
		$('#nextTest').show();
		$('#checkAnswer').hide();
		$('#nextExercise').hide();
		$('#showTheory').hide();
		$('#backToOverview').hide();
		
		$('#nextTest').click(function(){
			if (savingInProgress > 0 || exerciseLoading){
				return false;
			}
			
			if ((parseInt(currentExerciseNumber)+2) == 0){
				$('#nextTest').hide();
				$('#finishTest').show();
			}
			
			if (isCanvasSupported()){
				exercise.checkAnswer();
			}else{
				eqSwf.showSolution();
			}
			
			currentExerciseNumber++;
			if (isCanvasSupported()){
				loadExercise();
			}else{
				eqSwf.gotoNext();
			}
		});
		
		
		$('#finishTest').click(function(){
			if (savingInProgress > 0 || exerciseLoading){
				return false;
			}
			
			$('#finishTest').hide();
			
			exercise.checkAnswer();
			
			if (typeof showResult == 'function'){
				showResult();
			}
		});
	}
}


function drawCanvas(){
	stage = new Kinetic.Stage({
		'container': "exerciseCanvas",
		'width': projectData.stageWidth,
		'height': projectData.stageHeight
	});
	
	loadExercise();
}


function clearCanvas(){
	if (typeof(exercise) !== 'undefined'){
		stage.removeChildren();
	}
}


function clearMedia(){
    $('#media, #behindMedia').html('');
}


function loadExercise(){
	exerciseLoading = true;
	
	clearCanvas();
	clearMedia();
	
	$.post('eq/index/getexercise/',{'projectId': 3, 'num': currentExerciseNumber}, function(data){
	    if (data != ''){
    		exerciseData = $.parseJSON(data);
	   	
		  exercise = new Kinetic.Exercise({
		  	'data': exerciseData
		  });
		  
		  exerciseLoading = false;
	   }
	});
}


function showMessage(message){
	$('#messageBox').html(message).show();
}