var success="<img src=\"http://distance_ed.unlv.edu/site_grafx/commute_calc/check.gif\" alt=\"\" />";
var question="<img src=\"http://distance_ed.unlv.edu/site_grafx/commute_calc/question.gif\" alt=\"\" />";
var error="<img src=\"http://distance_ed.unlv.edu/site_grafx/commute_calc/error.gif\" alt=\"\" />";
	
function getValues(sameDist){
	var gasPriceHigh = 5.99;
	var gasPriceLow	= 3.00;
	var frUNLV;
	var toUNLV;
	var same=false;
	
	// Check gas price
	if($('gasPriceIn').value.length>0){	
		$('gasPriceIcon').innerHTML=success;
		$('gasPriceMsg').innerHTML="";
		
		var gasPriceIn=$('gasPriceIn').value;
		
		if(gasPriceIn > gasPriceHigh){ 
			$('gasPriceIcon').innerHTML=question;
			$('gasPriceMsg').innerHTML="$"+gasPriceIn+" seems like an awful lot to pay for gas.";
			$('gasPriceMsg').style.display='block';
		}
		else if(gasPriceIn < gasPriceLow){
			$('gasPriceIcon').innerHTML=question;
			$('gasPriceMsg').innerHTML="$"+gasPriceIn+ " seems a little low for a gallon of gas.";
			$('gasPriceMsg').style.display='block';
		}
		gasCalc=true;
	}else {
		gasCalc=false;
		$('gasPriceIcon').innerHTML=error;
		$('gasPriceMsg').style.display='none';
	}

	// Check distances
	if($('toUNLV').value.length>0){
		toUNLV = $('toUNLV').value;
		if($('same').checked){ 
			same = true;
			//alert ('not checke');
			frUNLV = toUNLV;
			frUNLVCalc = true;
			$('frUNLV').disabled=true;
			$('frUNLV').value=$('toUNLV').value;
		}else{
			$('frUNLV').disabled=false;
			frUNLV = $('frUNLV').value;
			frUNLVCalc = false;
		}

		if(toUNLV>0){
			if(toUNLV>100){
				$('toUNLVIcon').innerHTML=question;
				$('toUNLVMsg').innerHTML="Please double check your distances and reenter if necessary";
			}else{
				$('toUNLVIcon').innerHTML=success;
				$('toUNLVMsg').innerHTML="";
			}
			toUNLVCalc = true;
		}else{
			$('toUNLVIcon').innerHTML=error;
			$('toUNLVMsg').innerHTML="Hey, this should be a number greater than 0!";
			toUNLVCalc=false;
		}

		if(!same && $('frUNLV').value.length>0){
			if(frUNLV>0){
				if(frUNLV>100){
					$('frUNLVIcon').innerHTML=question;
					$('frUNLVMsg').innerHTML="Please double check your distances and reenter if necessary";
				}else{
					$('frUNLVIcon').innerHTML=success;
					$('frUNLVMsg').innerHTML="";
				}
				frUNLVCalc = true;
			}else{
				$('frUNLVIcon').innerHTML=error;
				$('frUNLVMsg').innerHTML="Hey, this should be a number greater than 0!";
				frUNLVCalc=false;
			}			
		}
	}else{
		$('toUNLVIcon').innerHTML=error;
		toUNLVCalc=false;
	}

	// Check MPG
	if($('mpg').value.length>0){
		var mpg =	$('mpg').value;

		if(mpg == 0){
			$('mpgMsg').innerHTML="Sorry! Can't figure this out for cars that get "+mpg+" mpg.";
			$('mpgMsg').style.display='block';
			$('mpgIcon').innerHTML=error;
			mpgCalc=false;
		}else{
			if(mpg > 100){
				$('mpgMsg').innerHTML="Wow! You shuold patent that car!";
				$('mpgMsg').style.display='block';
				$('mpgIcon').innerHTML=error;
			}else if(mpg > 40){
				$('mpgMsg').innerHTML="Wow! That is excellent gas mileage, good for you.";
				$('mpgMsg').style.display='block';
				$('mpgIcon').innerHTML=question;	
			}else if($('mpg').value<8){
				$('mpgMsg').innerHTML="Ouch! Do you have a Hummer?";
				$('mpgMsg').style.display='block';
				$('mpgIcon').innerHTML=question;
			}else{
				$('mpgMsg').innerHTML="";
				$('mpgMsg').style.display='none';
				$('mpgIcon').innerHTML=success;
			}
			mpgCalc = true;
		}
	}else{
		mpgCalc=false; 
		$('mpg').innerHTML=error; 
		$('mpg').style.display='block';
	}

	// Check maint expenses
	if($('maint').value.length>0){	
		if($('maint').value>-1 && $('maint').value<2000){
			$('maintIcon').innerHTML=success;
			$('maintMsg').innerHTML='';
			maintCalc=true;
		}else{
			$('maintIcon').innerHTML=success;
			$('maintMsg').innerHTML='';		
			maintCalc=false;
		}
	}
	
	// Check other
	if($('other').value.length>0){
		if($('other').value>-1 && $('other').value<2000){
			$('otherIcon').innerHTML=success;
			$('otherMsg').innerHTML='';
			otherCalc=true;
		}else{
			$('otherIcon').innerHTML=success;
			$('otherMsg').innerHTML='';		
			otherCalc=false;
		}
	}
		
	if(toUNLVCalc && frUNLVCalc && gasCalc && mpgCalc ){
	//if(toUNLVCalc && frUNLVCalc && gasCalc && mpgCalc && maintCalc && otherCalc){
		//alert (toUNLVCalc +" "+ frUNLVCalc +" "+ gasCalc +" "+ mpgCalc);
		displayTotal();
	}else{
		$('results').style.display = 'none';
	}
}

function checkField(field){
	field.value = field.value.replace(/[^0-9.]/g,'');
	//var t=setTimeout("getValues()",250);
}

function displayTotal(){
	// Variables
	var numWeeksInSem = 15;
	var mpg			= parseFloat($('mpg').value);
	var toDist	= parseFloat($('toUNLV').value);
	var frDist	= parseFloat($('frUNLV').value);
	var cost		= parseFloat($('gasPriceIn').value);
	var maintIn	= parseFloat($('maint').value);
	var other		= 0;
	var dist		= toDist+frDist;

	if($('other').value.length>0){
		other = (parseInt($('other').value)) * (numWeeksInSem/52);
	}else{
		//alert($('other').value.length);
	}
//alert (cost);
	var maint		=	(maintIn * ((dist*15)/12000)) + other;
	
	var perDay = (dist * (1/mpg) * cost);
	var perClass = perDay * numWeeksInSem;
	
	var gas1 = perClass;
	var gas2 = perClass * 2;
	var gas3 = perClass * 3;
	var gas4 = perClass * 4;
	var gas5 = perClass * 5;
	
	var maint1 = maint;
	var maint2 = maint * 2 ;
	var maint3 = maint * 3;
	var maint4 = maint * 4;
	var maint5 = maint * 5;
		
	// Create result strings
	$('gas1').innerHTML=addCommas(gas1.toFixed(2));
	$('gas2').innerHTML=addCommas(gas2.toFixed(2));
	$('gas3').innerHTML=addCommas(gas3.toFixed(2));	
	$('gas4').innerHTML=addCommas(gas4.toFixed(2));	
	$('gas5').innerHTML=addCommas(gas5.toFixed(2));	
	
	$('maint1').innerHTML=addCommas(maint1.toFixed(2));
	$('maint2').innerHTML=addCommas(maint2.toFixed(2));
	$('maint3').innerHTML=addCommas(maint3.toFixed(2));
	$('maint4').innerHTML=addCommas(maint4.toFixed(2));
	$('maint5').innerHTML=addCommas(maint5.toFixed(2));
	
	$('total1').innerHTML=addCommas((maint1 + gas1).toFixed(2));
	$('total2').innerHTML=addCommas((maint2 + gas2).toFixed(2));
	$('total3').innerHTML=addCommas((maint3 + gas3).toFixed(2));
	$('total4').innerHTML=addCommas((maint4 + gas4).toFixed(2));
	$('total5').innerHTML=addCommas((maint5 + gas5).toFixed(2));

	 // Display
	 $('results').style.display = 'block';
	 
	/* troubleshooting 
	alert ('dist: '+dist+' '+toDist+' '+frDist+' '+perDay);
	alert ('misc: '+maint1);
	alert ('mpg: '+mpg);

	perDay=$('gasPriceIn').value/$('mpg').value;
	perDay*=$('toUNLV').value*1+$('frUNLV').value*1;
	perDay+=$('other').value*1;
	perDay*=16;
	*/
}

function sameDistance(node){
	if(node.checked){
		$('frUNLV').value = $('toUNLV').value;
		$('frUNLV').disabled=true;
		$('frUNLVIcon').innerHTML='';
		$('frUNLVMsg').innerHTML='';
	} else {
		$('frUNLV').disabled=false;
		$('frUNLV').value = '';
		$('frUNLVIcon').innerHTML=question;
		$('frUNLVMsg').innerHTML="Please add a value for your drive after your UNLV class.";
	}
	//alert ("leaving " + node.checked);
	getValues(node.checked);
}

function addCommas(nStr){ 
      nStr += ''; 
      x = nStr.split('.'); 
      x1 = x[0]; 
      x2 = x.length > 1 ? '.' + x[1] : ''; 
      var rgx = /(\d+)(\d{3})/; 
      while (rgx.test(x1)) { 
           x1 = x1.replace(rgx, '$1' + ',' + '$2'); 
      } 
      return "$" + x1 + x2; 
 }

function toggleButton(){
	//alert('here');
	$("learnMore").toggle(); 
}