var boxLimit	= 20;
var roomLimit	= 7;
var monthLimit	= 12;
var monthQty	= 1;
var beginMonth	= 1278000000;
var studentQty	= 1;
var roomQty		= 1;
var boxOptions	= new Array(1);
for (var i = 1;i < roomLimit;i++){
    boxOptions[i] = 0;
}

function calcCurriculumPrice()
{
    productCalc(monthQty,boxOptions,0);
}

function clearQtys()
{
    for(var i = 0; i < boxOptions.length; i++){
        boxOptions[i] = 0;
        setElementById('boxOption_'+i,0);
    }
    boxOptions[0] = 1;
}

function sortMonths(total)
{
    monthQty = total;
    monthQty = monthQty * 1;
    if(monthQty > monthLimit){
        monthQty = monthLimit;
        setElementById('monthQty',monthLimit);
    }

    clearQtys();
    setQtyValues();
}

function sortStudents(total)
{
    studentQty = total;
    studentQty = studentQty * 1;

    roomQty = 1; //reset the room qty

    clearQtys(); //reset the students in each room
    setQtyValues();
}

function sortRooms(total)
{
    roomQty = total;
    studentQty = document.getElementById('studentQty').value * 1;
    roomQty = roomQty * 1;

    if(studentQty < roomQty){ //make sure we have at least one student in each room
        studentQty = roomQty;
        setElementById('studentQty',studentQty);
    }

    clearQtys();
    setQtyValues();
}

function setElementById(el,val)
{
    if(document.getElementById(el)){
       document.getElementById(el).value = val;
    }
}

function getElementValueById(el)
{
    if(document.getElementById(el)){
       return document.getElementById(el).value;
    } else {
        return 0;
    }
}

function setQtyValues()
{
    var rooms = 0;
    var i = 0;
    var fullBoxes = 0;
    var otherBox = 0;
    var studentSub = studentQty;

    if(studentQty > boxLimit){
        fullBoxes = Math.floor(studentQty / boxLimit);
        otherBox = studentQty % boxLimit;
        rooms = (otherBox != 0)? fullBoxes + 1:fullBoxes;
        if(roomQty <= rooms){
            roomQty = rooms;
            roomLimit = rooms;
            messWithTestBox(rooms);
            setElementById('roomQty',rooms);
            splitByBoxes(fullBoxes,otherBox,rooms);
            countStudents(); // calcCurriculumPrice() is included in this function
        } else {

            messWithTestBox(roomQty);
            splitByRooms();
            calcCurriculumPrice();
        }

    } else if(roomQty == 1) {
        messWithTestBox(roomQty);
        boxOptions[0] = studentQty;
        setElementById('boxOption_0',studentQty);
        setElementById('roomQty',roomQty);
        calcCurriculumPrice();
    } else {
        messWithTestBox(roomQty);
        splitByRooms();
        calcCurriculumPrice();
    }
    //toggleRoomView()
}
function messWithTestBox(rooms)
{
    var box = document.getElementById("testBox");

    var inputs = "";
    var i = 0;
        while(i < rooms){
        inputs = inputs + '<input type="text" name="boxOption[]" onChange="javascript: countStudents();" id="boxOption_'+i+'" size="4" value="';
            if(i == 0){
                inputs = inputs + "1";
            } else {
                inputs = inputs + "0";
            }
            inputs = inputs + '">';
            i++;
        }
        box.innerHTML = inputs;
}

function splitByBoxes(boxes,lastBox,rooms)
{
    boxLimit = boxLimit * 1;
    halfLimit = boxLimit / 2;
    //handle all the boxes leading up to the last one
    for(var i = 0; i < boxes;i++){
        if(i == (boxes - 1)){
            if(lastBox < halfLimit && lastBox != 0){
                boxOptions[i] = lastBox + halfLimit;
                setElementById('boxOption_'+i, lastBox +halfLimit);
            } else {
                boxOptions[i] = boxLimit;
                setElementById('boxOption_'+i,boxLimit);
            }
        } else {
            boxOptions[i] = boxLimit;
            setElementById('boxOption_'+i,boxLimit);
        }
    }
    // last box
    if(lastBox != 0){
        if(lastBox < halfLimit){ //since we've already added the lastBox value to the previous box, use the halfLimit
            boxOptions[boxes] = halfLimit;
                setElementById('boxOption_'+boxes,halfLimit);
        } else { //if we didn't use the lastBox value yet, use it here
            boxOptions[boxes] = lastBox;
            setElementById('boxOption_'+boxes,lastBox);
        }
    } else if(boxes != roomLimit) { // if the limit divides into the total evenly then there is no remainder
        boxOptions[boxes] = 0;
        setElementById('boxOption_'+boxes,0);
    }
    for(i = rooms;i < boxOptions.length;i++){
        boxOptions[i] = 0;
        setElementById('boxOption_'+i,0);
    }
}

function splitByRooms()
{
    var boxes = Math.floor(studentQty / roomQty);
    var leftOver = studentQty % roomQty;
    for(var i = 0; i < roomQty;i++){
        boxOptions[i] = boxes;
        setElementById('boxOption_'+i,boxes);
    }
    if(leftOver != 0){
        boxOptions[0] = leftOver + boxes;
        setElementById('boxOption_0',leftOver + boxes);
    }
    for(i = roomQty;i < boxOptions.length;i++){
        boxOptions[i] = 0;
        setElementById('boxOption_'+i,0);
    }
}

function compareCounts(boxes,studentQty)
{
	if(boxes != studentQty){
		alert("The total number of students must match the quantity entered in the rooms.");
		return false;
	}
	return true;
}

function countStudents()
{
    studentQty = 0;
    roomQty = 0;
    for(var i = 0;i < boxOptions.length; i++){
        boxOptions[i] = Number(getElementValueById('boxOption_'+i));
        if(boxOptions[i] > boxLimit){
            boxOptions[i] = boxLimit;
            setElementById('boxOption_'+i,boxLimit);
            toggleQtyWarning();
        }
        studentQty += boxOptions[i];
        if(boxOptions[i] > 0){
            roomQty += 1;
        }
    }
	setElementById('roomQty',roomQty);
    setElementById('studentQty',studentQty);
    calcCurriculumPrice();
}
function toggleRoomView()
{
    if(roomQty > 1){
        document.getElementById('roomBoxes').style.display = "block";
        document.getElementById('roomBoxesAlt').style.display = "none";
    } else {
        document.getElementById('roomBoxes').style.display = "none";
        document.getElementById('roomBoxesAlt').style.display = "block";
    }
}
function fadeDown(obId,value)
{
    var ob = document.getElementById(obId);
    value = value -1;
    if(value >= 0){
        ob.style.opacity = value/10;
        ob.style.filter = 'alpha(opacity=' + value*10 + ')';
        setTimeout('fadeDown("'+obId+'",'+value+')',100);
    }
}
function toggleQtyWarning()
{
    var box = document.getElementById('qtyWarning');
    if(box.style.opacity == 10){
        fadeDown('qtyWarning',10);
    } else {
        box.style.display = "block";
        box.style.opacity = 10;
        setTimeout('toggleQtyWarning()',5000);
    }
}