// Body Mass Index Calculator
// copyright 28th April 2006, by Stephen Chapman
// permission to use this Javascript on your web page is granted
// provided that all of the code in this script (including these
// comments) is used without any alteration

function valButton(btn) {var cnt = -1;for (var i=btn.length-1; i > -1; i--) {   if (btn[i].checked) {cnt = i; i = -1;}}if (cnt > -1) return btn[cnt].value;else return null;}
function stripBlanks(fld) {var result = "";var c = 0;for (i=0; i < fld.length; i++) {if (fld.charAt(i) != " " || c > 0) {result += fld.charAt(i);if (fld.charAt(i) != " ") c = result.length;}}return result.substr(0,c);}
function calc(thisform) {
	var d = valButton(thisform.d);
	if (d == null) {alert("You must choose centimeters/kg or inches/lb");return false;}
	cv = d.split(',');;

	var h = stripBlanks(thisform.h.value);if (h == '') {alert("You must enter your height in ft/m"); thisform.h.focus();return false;}
	var h2 = stripBlanks(thisform.h2.value);if (h2 == '') {alert("You must enter your height in inches/cm"); thisform.h2.focus();return false;}

	if (h != Number(h)) {alert("Invalid height entered");thisform.h.focus();return false;}
	if (cv[0] == 2.54) { h = Number(h) * 12; } else { h = Number(h) * 100; }

	if (h2 != Number(h2)) {alert("Invalid height entered");thisform.h2.focus();return false;}
	if (cv[0] == 2.54) { h = Number(h) + Number(h2); } else { h = Number(h) + Number(h2); }
	h = Number(h*cv[0]/100);
 
	var w = Number(stripBlanks(thisform.w.value));
	if (w == '') {alert("You must enter your weight");thisform.w.focus();return false;}
	if (w != Number(w)) {alert("Invalid weight entered");thisform.w.focus();return false;} 
	w = Number(w/cv[1]);

	thisform.f.value = Math.round(w / (h*h)*100)/100;

}

function calc_hr(thisform) {
						var dropdownIndex = thisform.intensity.selectedIndex;
						var intensity = thisform.intensity[dropdownIndex].value;
						rest = Math.floor(thisform.rest.value);
						max  = Math.floor(thisform.max.value);
                                                thisform.target1.value = ((max - rest) * intensity) + rest;
}

function max_calc_hr(thisform) {					
						var ss = thisform.gender.selectedIndex;
						var exp = thisform.experience.selectedIndex;
						if (exp == 2) {
	                                                if (ss == 0){
		                                                val = 217-(0.85 * thisform.age.value);
                	                                }
                        	                        if (ss == 1){
	                        	                        val = 212-(0.75 * thisform.age.value);
                                        	        }
                                                } else {
	                                                if (ss == 0){
		                                                val = 205.8-(0.685 * thisform.age.value);
                	                                }
                        	                        if (ss == 1){
	                        	                        val = 205.8-(0.7 * thisform.age.value);
                                        	        }
						};
                                                thisform.target1.value = Math.round(val);
}

// * * * * * * * * * * * * *
// Pace Calculator JavaScript Base
// created by: Keith Jenci
// modified 01/02/2001
// http://www.mredkj.com
// * * * * * * * * * * * * *
// 
// Modified for runningmagazine.ca by Travis Sitzlar - http://www.infoclipper.com
//

// set global variables to be used by all functions
var dist
var ndist
var time //in total secs
var pace //in total secs
var thr //hr component for time
var tmin
var tsec
var phr //hr component for pace
var pmin
var psec
var dunit //type of unit dist is in (miles, kilometers, etc)
var event //or dist like marathon, half-marathon
var punit //unit pace is in (the per unit, aka mile, kilometer, quarter, half, etc)
var maradist = '26.2'
var halfmaradist = '13.1'
var shgt = 34 // height of rows in split table to compute height of subwindow

function CalcTime(form){
// Main routine for Time
// Validate required data, convert to total secs, do computation, display results
// Time = Dist * Pace
	if (!(CheckTime(form))){
		alert("To calculate Time, enter the Pace and Distance")
	}else{ //got good data, now process it
		dunit = form.dunit.options[form.dunit.selectedIndex].value
		punit = form.punit.options[form.punit.selectedIndex].value
		var factor = convUnit(dunit, punit)
		time = dist  * pace * factor
		form.thr.value = HrsFromTSecs(time)
		form.tmin.value = MinsFromTSecs(time)
		form.tsec.value = SecsFromTSecs(time)
	}
}

function CalcTimePrev(form){
// Main routine for Time
// Validate required data, convert to total secs, do computation, display results
//T2= T1 * ((D2/D1) * factor)^1.06

        ndist = form.ndist.value
        if (!(isPosNum(ndist))) { alert("New race distance is not valid."); return false;}
        ndist = StripZeroes(ndist)
        ndist = parseFloat(ndist, 10)
	
	if (!(CheckTime(form))){
		alert("To calculate Time, enter your Previous Time, Previous Distance, and New Distance")
	}else{ //got good data, now process it
		dunit = form.dunit.options[form.dunit.selectedIndex].value
		ndunit = form.ndunit.options[form.ndunit.selectedIndex].value
		phr = form.phr.value;
		pmin = form.pmin.value;
		psec = form.psec.value;
		var factor = convUnit(dunit, ndunit)

		t1 = toSecs(phr, pmin, psec);
		t2 = t1 * Math.pow(((ndist/dist) * factor), 1.06);
 
		form.finish.value = HrsFromTSecs(t2) + ":" + MinsFromTSecs(t2) + ":" + SecsFromTSecs(t2);
	}
}

function CalcDist(form){
// Main routine for Dist
// Validate required data, do computation, and display results
// Dist = Time / Pace
	if (!(CheckDist(form))){
		alert("To calculate Dist, enter the Time and Pace")
	}else{
		dunit = form.dunit.options[form.dunit.selectedIndex].value
		punit = form.punit.options[form.punit.selectedIndex].value
		var factor = convUnit(punit, dunit)
		dist = time / (pace / factor)
		form.dist.value = dist
	}
}

function CalcPace(form){
// Main routine for Pace
// Validate required data, do computation, and display results
// Pace = Time / Dist
	if (!(CheckPace(form))){
		alert("To calculate Pace, enter the Time and Distance")
	}else{
		dunit = form.dunit.options[form.dunit.selectedIndex].value
		punit = form.punit.options[form.punit.selectedIndex].value
		var factor = convUnit(dunit, punit)
		pace = (time / dist) / factor

		form.phr.value = HrsFromTSecs(pace)
		form.pmin.value = MinsFromTSecs(pace)
		form.psec.value = SecsFromTSecs(pace)
	}
}

function convUnit (funit, tunit ){
		if (funit == tunit) return 1
		else if (funit == "Mile" && tunit == "Kilometer") return 1.609344
		else if (funit == "Mile" && tunit == "Meter") return 1609.344
		else if (funit == "Mile" && tunit == "Yard") return  1760
		else if (funit == "Mile" && tunit == "Half Mile") return 2
		else if (funit == "Mile" && tunit == "Quarter Mile") return 4
		else if (funit == "Mile" && tunit == "Eigth Mile") return 8
		else if (funit == "Mile" && tunit == "1500M") return 1.072896
		else if (funit == "Mile" && tunit == "800M") return 2.01168
		else if (funit == "Mile" && tunit == "400M") return 4.02336
		else if (funit == "Mile" && tunit == "200M") return 8.04672

		else if (funit == "Kilometer" && tunit == "Mile") return .6213712
		else if (funit == "Kilometer" && tunit == "Meter") return 1000
		else if (funit == "Kilometer" && tunit == "Yard") return  1093.613
		else if (funit == "Kilometer" && tunit == "Half Mile") return 1.2427424
		else if (funit == "Kilometer" && tunit == "Quarter Mile") return 2.4854848
		else if (funit == "Kilometer" && tunit == "Eigth Mile") return 4.9709696
		else if (funit == "Kilometer" && tunit == "1500M") pace = (time / dist)  / .66666666
		else if (funit == "Kilometer" && tunit == "800M") return 1.25
		else if (funit == "Kilometer" && tunit == "400M") return 2.5
		else if (funit == "Kilometer" && tunit == "200M") return 5

		else if (funit == "Meter" && tunit == "Mile") return .0006213712
		else if (funit == "Meter" && tunit == "Kilometer") return .001
		else if (funit == "Meter" && tunit == "Yard") return  1.093613
		else if (funit == "Meter" && tunit == "Half Mile") return .0012427424
		else if (funit == "Meter" && tunit == "Quarter Mile") return .0024854848
		else if (funit == "Meter" && tunit == "Eigth Mile") return .0049709696
		else if (funit == "Meter" && tunit == "1500M") pace = (time / dist)  /  .0006666
		else if (funit == "Meter" && tunit == "800M") return .00125
		else if (funit == "Meter" && tunit == "400M") return .0025
		else if (funit == "Meter" && tunit == "200M") return .005

		else if (funit == "Yard" && tunit == "Mile") return .0005681 // (1/1760=)
		else if (funit == "Yard" && tunit == "Kilometer") return .0009144
		else if (funit == "Yard" && tunit == "Meter") return  .9144
		else if (funit == "Yard" && tunit == "Half Mile") return .0011362
		else if (funit == "Yard" && tunit == "Quarter Mile") return .0022724
		else if (funit == "Yard" && tunit == "Eigth Mile") return .0045448
		else if (funit == "Yard" && tunit == "1500M") pace = (time / dist)  / .0006096
		else if (funit == "Yard" && tunit == "800M") return .001143
		else if (funit == "Yard" && tunit == "400M") return .002286
		else if (funit == "Yard" && tunit == "200M") return .004572
}

function CheckTime(form){
// Makes sure that both the Dist and Pace data needed to calc Time are valid
	if((getDist(form)) && (getPace(form))){
		return true
	}else{
		return false
	}
}

function CheckDist(form){
// Makes sure that both the Time and Pace data needed to calc Dist are valid
	if(getTime(form) && getPace(form)){
		return true
	}else{
		return false
	}
}

function CheckPace(form){
// Makes sure that both the Dist and Time data needed to calc Pace are valid
	if((getTime(form)) && (getDist(form))){
		return true
	}else{
		return false
	}
}

function getTime(form){
// set global time var to total secs and return true if input valid
	thour = form.thr.value
	if (thour == "") {thour = "0"} // substitute 0 for null components
	if (!(isPosNum(thour))){return false}
	thr = StripZeroes(thour)
	tminute = form.tmin.value
	if (tminute == "") {tminute = "0"} // substitute 0 for null components
	if(!(isPosNum(tminute))){return false}
	tmin = StripZeroes(tminute)
	tsecond = form.tsec.value
	if (tsecond == "") {tsecond = "0"} // substitute 0 for null components
	if(!(isPosNum(tsecond))){return false}
	tsec = StripZeroes(tsecond)
	time = toSecs(thr, tmin, tsec)
	time = parseFloat(time, 10)
	if (time == 0) return false // means all components were null
return true
}

function getDist(form){
// set global dist var to a number and return true if input valid
	dist = form.dist.value
	if (!(isPosNum(dist))) {return false}
	dist = StripZeroes(dist)
	dist = parseFloat(dist, 10)
	return true
}

function getPace(form){
// set global pace var to total secs and return true	if input valid
	phr = form.phr.value
	if (phr == "") {phr = "0"} // substitute 0 for null components
	if (!(isPosNum(phr))) {return false}
	phr = StripZeroes(phr)
	pmin = form.pmin.value
	if (pmin == "") {pmin = "0"} // substitute 0 for null components
	if (!(isPosNum(pmin))) {return false}
	pmin = StripZeroes(pmin)
	psec = form.psec.value
	if (psec == "") {psec = "0"} // substitute 0 for null components
	if (!(isPosNum(psec))) {return false}
	psec = StripZeroes(psec)
	pace = toSecs(phr, pmin, psec)
	pace = parseFloat(pace, 10)
	if (pace == 0) return false
return true
}

function toSecs(hr, min, sec){
// Convert each component to a number (remove leading 0) and sum them
	var hour = parseFloat(hr, 10)
	var minute = parseFloat(min, 10)
	var second = parseFloat(sec, 10)
	var hsecs = parseFloat(hour * 3600)
	var msecs = parseFloat(minute * 60)
	var total = hsecs + msecs + second
return total
}

function HrsFromTSecs(totsecs){
// Gets hr component for hr:min:sec string
	var hrs // hr component as string
	var flthrs = totsecs / 3600
	hrs = Math.floor(flthrs) //get next int less or equal
	hrs = hrs.toString(10)
	if (hrs.length == 1) {hrs = "0" + hrs}
return hrs
}

function MinsFromTSecs(totsecs){
// Gets min component for  hr:min:sec string
	var mins // hr component as string
	var hrs = HrsFromTSecs(totsecs)
	var nsecs = hrs * 3600
	var secsleft = totsecs - nsecs
	var fltmin = secsleft / 60
	mins = Math.floor(fltmin) //conv to integer
	mins = mins.toString(10)
	if (mins.length == 1) {mins = "0" + mins}
return mins
}

function SecsFromTSecs(totsecs){
// Converts total seconds number to hr:min:sec string
// secs is only component that may have a decimal value
	var secs // hr component as string
	secs = totsecs - (HrsFromTSecs(totsecs) * 3600) - (MinsFromTSecs(totsecs) * 60)
	secs = Math.floor(secs)
	secs = secs.toString(10)
	if (secs.length == 1) {
		secs = "0" + secs
	}else{ // check for a decimal point
		for (var i = 0; i < secs.length; i++){
				tchar = secs.charAt(i)
			if (i == 1 && tchar == "."){
				secs = "0" + secs
				break
			}
		}
	}
return secs
}

function StripZeroes(number){
// Strips off the leading 0, unless only one char
	if (number.length == 1) return number
	var outnum = ""
	var goodc
	mynum = number.toString(10)
	for (var i = 0; i < mynum.length;  i++){
		goodc  = mynum.charAt(i)
		if (i == 0 && goodc  == "0"){
			continue // skip
		}
		outnum += goodc
	}
return outnum
}

function isPosNum(number){
// Validates number as positive number with only one decimal point at most
	mynum = number.toString(10)
	if (mynum.length == 0) {return false}
	oneDecimal = false
	for (var i = 0 ; i < mynum.length; i++){
		var oneChar = mynum.charAt(i)
		if (oneChar  ==  "." && !oneDecimal){
			oneDecimal = true
			continue
		}
		if (oneChar < "0" ||  oneChar > "9"){
			return false
		}
	}// end of for
	return true
}

function setDunit (form){
	if (form.event.options[1].selected == true){ //mara
		form.dunit.options[0].selected=true // set dist unit to miles
		form.dist.value = maradist //set dist to mara
	}
	if (form.event.options[2].selected==true){//halfmara
		form.dunit.options[0].selected=true // set dist unit to miles
		form.dist.value = halfmaradist
	}
	if (form.event.options[3].selected==true){//5K
		form.dunit.options[1].selected=true // set dist unit to kilometers
		form.dist.value = 5
	}
	if (form.event.options[4].selected==true){//5M
		form.dunit.options[0].selected=true // set dist unit to miles
		form.dist.value = 5
	}
	if (form.event.options[5].selected==true){//8K
		form.dunit.options[1].selected=true // set dist unit to kilometers
		form.dist.value = 8
	}
	if (form.event.options[6].selected==true){//10K
		form.dunit.options[1].selected=true // set dist unit to kilometers
		form.dist.value = 10
	}
	if (form.event.options[7].selected==true){//15K
		form.dunit.options[1].selected=true // set dist unit to kilometers
		form.dist.value = 15
	}
	if (form.event.options[8].selected==true){//10M
		form.dunit.options[0].selected=true // set dist unit to miles
		form.dist.value = 10
	}
	if (form.event.options[9].selected==true){//20K
		form.dunit.options[1].selected=true // set dist unit to kilometers
		form.dist.value = 20
	}
	if (form.event.options[10].selected==true){//15M
		form.dunit.options[0].selected=true // set dist unit to miles
		form.dist.value = 15
	}

	if (form.event.options[11].selected==true){//25K
		form.dunit.options[1].selected=true // set dist unit to kilometers
		form.dist.value = 25
	}
	if (form.event.options[12].selected==true){//30K
		form.dunit.options[1].selected=true // set dist unit to kilometers
		form.dist.value = 30
	}
	if (form.event.options[13].selected==true){//20M
		form.dunit.options[0].selected=true // set dist unit to miles
		form.dist.value = 20
	}
}

function cal_bmr(lbs, ins, gen, age) {
   hcm = ins * 2.54; // convert to centimeters
   wkg = lbs * 0.4536; //convert to kilos
   var bmr
   if (gen == "F") {
	bmr = 655 + (9.6 * wkg) + (1.8 * hcm) - (4.7 * age);
   } else {
	bmr = 66 + (13.7 * wkg) + (5 * hcm) - (6.8 * age);
   }
   f_bmr = Math.floor(bmr);
   diff  = bmr - f_bmr;
   diff = diff * 10;
   diff = Math.round(diff);

   if (diff == 10) {
      // Need to bump up the whole thing instead
      f_bmr += 1;
      diff = 0;
   }

   bmr = f_bmr + "." + diff;
   return bmr;
}

function compute(f) {
   var gen = f.gen.options[f.gen.selectedIndex].value;
   var age = f.age.value;
   var fi = parseInt(f.htf.options[f.htf.selectedIndex].value * 12);
   var ii = parseInt(f.hti.options[f.hti.selectedIndex].value);
   var i = fi + ii;
 

   w = f.wt.value;
   if (chkw(w) && chkw(age)){
      f.bmr.value = cal_bmr(w, i, gen, age);
   } else { 
      alert("Please enter a number for your weight."); 
   }
}

function chkw(w) {
   if (isNaN(parseInt(w))) {
      return false;
   } else if (w < 0) {
      return false;
   }
   else {
      return true;
   }
}