//*******************************************
//DO NOT REMOVE THIS COPYWRITE INFO!
//Brown Bag Savings Calculator
//2004 Daniel C. Peterson ALL RIGHTS RESERVED
//Created: 01/07/2004
//Last Modified: 01/07/2004
//This script may not be copied, edited, distributed or reproduced
//without express written permission from
//Daniel C. Peterson of Web Winder Website Services
//For commercial use rates, contact:
//Dan Peterson:
//Web Winder Website Services
//P.O. Box 11
//Bemidji, MN  56619
//dan@webwinder.com
//http://www.webwinder.com
//Commercial User Licence #:5782-1237-119-1198
//Commercial Licence Date:2008-09-11
//*******************************************



function stripNum(num) {

   num=num.toString();


   var len = num.length;
   var rnum = "";
   var test = "";
   var j = 0;

   var b = num.substring(0,1);
   if(b == "-") {
      rnum = "-";
   }

   for(i = 0; i <= len; i++) {

      b = num.substring(i,i+1);

      if(b == "0" || b == "1" || b == "2" || b == "3" || b == "4" || b == "5" || b == "6" || b == "7" || b == "8" || b == "9" || b == ".") {
         rnum = rnum + "" + b;

      }

   }

   if(rnum == "" || rnum == "-") {
      rnum = 0;
   }

   rnum = Number(rnum);

   return rnum;

}



function formatNumberDec(num, places, comma) {

var isNeg=0;

    if(num < 0) {
       num=num*-1;
       isNeg=1;
    }

    var myDecFact = 1;
    var myPlaces = 0;
    var myZeros = "";
    while(myPlaces < places) {
       myDecFact = myDecFact * 10;
       myPlaces = eval(myPlaces) + eval(1);
       myZeros = myZeros + "0";
    }
    
	onum=Math.round(num*myDecFact)/myDecFact;
		
	integer=Math.floor(onum);

	if (Math.ceil(onum) == integer) {
		decimal=myZeros;
	} else{
		decimal=Math.round((onum-integer)* myDecFact)
	}
	decimal=decimal.toString();
	if (decimal.length<places) {
        fillZeroes = places - decimal.length;
	   for (z=0;z<fillZeroes;z++) {
        decimal="0"+decimal;
        }
     }

   if(places > 0) {
      decimal = "." + decimal;
   }

   if(comma == 1) {
	integer=integer.toString();
	var tmpnum="";
	var tmpinteger="";
	var y=0;

	for (x=integer.length;x>0;x--) {
		tmpnum=tmpnum+integer.charAt(x-1);
		y=y+1;
		if (y==3 & x>1) {
			tmpnum=tmpnum+",";
			y=0;
		}
	}

	for (x=tmpnum.length;x>0;x--) {
		tmpinteger=tmpinteger+tmpnum.charAt(x-1);
	}


	finNum=tmpinteger+""+decimal;
   } else {
      finNum=integer+""+decimal;
   }

    if(isNeg == 1) {
       finNum = "-" + finNum;
    }

	return finNum;
}


function addSpaces(txt,w) {
   var Vtxt = "" + txt + "";
   var add = w - Vtxt.length;
   var i = 0;
   while(i < add) {
      i +=1;
      Vtxt = " " + Vtxt;
   }

  return Vtxt;
}

function computeForm(form) {

if (form.mealHomeCost.value == null || form.mealHomeCost.value.length == 0) {
   alert("Please enter the average cost to bring a bag lunch to work.");
   form.mealHomeCost.focus();
} else
if (form.mealOutCost.value == null || form.mealOutCost.value.length == 0) {
   alert("Please enter the average daily cost to eat lunch at a restaurant, fast food, or cafe.");
   form.mealOutCost.focus();
} else
if (form.dineOutDaysPerWk.value == null || form.dineOutDaysPerWk.value.length == 0) {
   alert("Please enter number of days per week you eat out for lunch.");
   form.dineOutDaysPerWk.focus();
} else
if (form.numYears.value == null || form.numYears.value.length == 0) {
   alert("Please enter number of years you would like to calculate the savings for.");
   form.numYears.focus();
} else
if (form.intRate.value == null || form.intRate.value.length == 0) {
   alert("Please enter the interest rate you could earn if you invested the savings from brown-bagging it.");
   form.intRate.focus();
} else {

var VmealHomeCost = stripNum(form.mealHomeCost.value);
var VmealOutCost = stripNum(form.mealOutCost.value);
var brownBagSave = eval(VmealOutCost) - eval(VmealHomeCost);

var VdineOutDaysPerWk = stripNum(form.dineOutDaysPerWk.value);
var VmonthlySavings = (VdineOutDaysPerWk * 52 * brownBagSave) / 12;

var VnumYears = stripNum(form.numYears.value);
var VintRate = stripNum(form.intRate.value);

if (VintRate >= 1.0) {
   VintRate /= 100;
}
VintRate /= 12;

var numMonths = VnumYears * 12;

var prin = 0;
var count = 0;
var yearCount = 0;
var intEarned = 0;
var accumInt = 0;
var accumAnnSave = 0;
var accumAnnInt = 0;

var Vschedule = "";
var numCol = "";
var intCol = "";
var saveCol = "";
var balCol = "";

while(count < numMonths) {

   count = eval(count) + eval(1);

   intEarned = prin * VintRate;
   prin = eval(prin) + eval(VmonthlySavings) + eval(intEarned);
   accumInt = eval(accumInt) + eval(intEarned);
   accumAnnInt = eval(accumAnnInt) + eval(intEarned);
   accumAnnSave = eval(accumAnnSave) + eval(VmonthlySavings);

   if((count > 1 && count % 12 == 0) || count  == numMonths) {

      yearCount = eval(yearCount) + 1;

      numCol = addSpaces(yearCount,3);
      intCol = addSpaces(formatNumberDec(accumAnnInt,2,1),12);
      saveCol =addSpaces(formatNumberDec(accumAnnSave,2,1),12);
      balCol = addSpaces(formatNumberDec(prin,2,1),15);

      Vschedule = "" + Vschedule + "" + numCol + " " + intCol + " " + saveCol + " " + balCol + "\r";

      accumAnnInt = 0;
      accumAnnSave = 0;

   }



}

var VtotLunchSaved = VmonthlySavings * numMonths;
form.totLunchSaved.value = "$" + formatNumberDec(VtotLunchSaved,2,1);

form.totIntSaved.value = "$" + formatNumberDec(accumInt,2,1);

var VgrandTotal = eval(VtotLunchSaved) + eval(accumInt);
form.grandTotal.value = "$" + formatNumberDec(VgrandTotal,2,1);

form.schedule.value = Vschedule;

   }
}

function clearResults(form) {

form.totLunchSaved.value = "";
form.totIntSaved.value = "";
form.grandTotal.value = "";
form.schedule.value = "";

}