$( "#af #take-survey" ).on("click",function( event ) {
			
	$(this).parent().hide();
	$(this).parent().next().fadeIn();				
	
	event.preventDefault();							
	
});

$( "#af #start" ).on("click",function( event ) {
	
	if( $("#af #ack").is(':checked') ){
		$(this).parent().hide();
		$(this).parent().next().fadeIn();		
	} else {
		alert("Please acknowledge that you have read and understood the information provided above by checking the checkbox.");
	}			
	
	event.preventDefault();							
	
});

$( "#af #ref" ).on("click",function( event ) {

	$(this).parent().parent().hide();
	$(this).parent().parent().next().fadeIn();	

	event.preventDefault();							
	
});			

$( "#af .back" ).on("click",function( event ) {	

	$(this).parent().parent().hide();
	$(this).parent().parent().prev().fadeIn();

	event.preventDefault();							
	
});					

$( "#af .next" ).on("click",function( event ) {			

	var score = 0;

	if ( $(this).hasClass("age") ) {
		
		var age = $("#af #age").find(":selected").val();
		
		if ( age != "" ) {				
			$(this).parent().parent().hide();
			$(this).parent().parent().next().fadeIn();
			
			if ( age <= 39 ) {
				score = 0;
			} else if ( age > 39 && age <= 64 ) {
				score = 1;
			} else if ( age > 64 ) {
				score = 3;
			}
			
			$(this).parent().find(".score").val(score);
								
		} else {
			alert("Please select your age.");
		}
		
	}	

	if ( $(this).hasClass("select") ) {				
		
		if ( $(this).parent().parent().find("input:checked").length != 0 ) {				
		
			$(this).parent().parent().hide();
			$(this).parent().parent().next().fadeIn();	

			$(this).parent().parent().find("input:checked").each(function( index ) {						
				score += parseInt($(this).data("score"));
				console.log(parseInt($(this).data("score")));	
			});			
				
			$(this).parent().find(".score").val(score);	
			
		} else {
			alert("Please answer the question.");
		}
		
	}				
	
	if ( $(this).hasClass("bmi") ) {
		
		var bmi = $( "#af #bmi span:eq(0)" ).text();
		
		if ( bmi != "" ) {	

			if ( bmi >= 18.5 && bmi <= 24.9 ) {
				score = 0;
			} else if ( bmi >= 25 && bmi <= 29.9 ) {
				score = 2;
			} else if ( bmi >= 30 ) {
				score = 4;
			}
			
			$(this).parent().find(".score").val(score);	
		
			$(this).parent().parent().hide();
			$(this).parent().parent().next().fadeIn();				
		} else {
			alert("Please calculate your BMI.");
		}
		
	}		
	
	if ( $(this).hasClass("last") ) {
		
		var final_score = 0;
		
		$("#af .step").each(function( index ) {
			if ( $(this).find(".score").length && $(this).find(".score").val() != "" ) {
				final_score += parseInt($(this).find(".score").val());
			}					
		});				
					
		if ( final_score <= 3 ) {
			$("#af #res").html("<span style='color:rgb(56,118,29);font-weight:bold;' >LOW</span>");					
			$("#af #res-desc").text("A low-risk score for atrial fibrillation (AFib) means your chances of developing AFib are lower than those with medium or high-risk scores. However, it doesn't eliminate the possibility of AFib entirely. To address any concerns, seek advice from a healthcare professional for personalized guidance and informed decisions about your heart health.");					
		} else {
			$("#af #res").html("<span style='color:rgb(236,37,46);font-weight:bold;' >MEDIUM/HIGH</span>");
			$("#af #res-desc").text("Medium/high risk for atrial fibrillation (AFib) means you have a higher chance of having AFib. Seeking further evaluation and guidance from a healthcare professional is crucial. Diagnosing AFib early and taking action can have a significant positive impact on your health and reduce the risk of complications. Don't hesitate to consult with a healthcare professional to ensure proper management and minimize potential health risks.");
		}								
		
	}			
	
	event.preventDefault();							
	
});	
	
	
$("#af #weight_unit, #af #height_unit").on('change', function() {
	calculate_bmi();
});	

$("#af #weight,#af #height").bind('keyup mouseup', function () {
	calculate_bmi();	
});
	
	
function calculate_bmi() {
	
	var weight_unit = $("#af #weight_unit").find(":selected").val();
	var height_unit = $("#af #height_unit").find(":selected").val();
	var weight = ( weight_unit == "KG" ) ? $("#af #weight").val() : $("#af #weight").val() / 2.205;
	var height = ( height_unit == "CM" ) ? $("#af #height").val() / 100 : $("#af #height").val() * 2.54 / 100 ;
	var bmi = Math.round( weight / (height*height) );
	var text;
	
	if ( bmi >= 18.5 && bmi <= 24.9 ) {
		text = "(Normal)";
	} else if ( bmi >= 25 && bmi <= 29.9 ) {
		text = "(Overweight)";
	} else if ( bmi >= 30 ) {
		text = "(Obese)";
	}
	
	if ( bmi > 0 && bmi != "Infinity") {			
		$("#af #bmi span:eq(0)").text(bmi);			
		$("#af #bmi span:eq(1)").text(text);			
	}	
	
}