//callled from the worldpay_form_page $document.ready
function init(){ 
    if ( window.location.search.substring(1) !="" ) { 
        var courseNumber = getPassedValue("courseNum"); 
        var total = getPassedValue("courseCost"); 
        var cartID= getPassedValue("cartID"); 
        var form= document.getElementById('formbuilder'); 
        var form2 = document.getElementsByTagName('input')[0].name; 
        var forwardGetString = buildGetString(cartID, total);

        //var goTo = $("input[name=redirect]").val() 
        var goTo = "http://tischasia.nyu.edu.sg/object/please_wait.html" + forwardGetString;
        $("input[name=redirect]").val( goTo  );

        //disable text in CourseList field
        $("#2287").attr("readonly", true);
        //disable text in CartID field
        $("#2286").attr("readonly", true);
        //disable text in TotalCost field
        $("#2288").attr("readonly", true);
    } 
} 

function buildGetString(theCartID, theTotal){
    var theCartID;
    var theTotal;
    var myGetString = "";
    myGetString = "?cartID="+theCartID+"&total="+theTotal;
    return myGetString;
}

function submitWorldpayForm(){
    $("#worldpayForm").submit();
}

function rewriteSubmit() {
    //remove iOns submit buttons, add custom button that calls function to tally form items and 
    //redirect to object/worldpay_form_page.html 
    $(".button").css("display", "none"); 
    $("form div table").after('<br><a id="added" href="#" onclick="parseCourseSubmit()">Submit </a>'); 
} 

function parseCourseSubmit() { 
    //get form values; append course numbers into a string and tally total cost of all courses to 
    //be passed as get string to object/worldpay_form_page.html 
    var cartID = generateRandom();
    var passParams = parseCourseList(); 
    var courses = passParams[0] ;
    var total = passParams[1] ;
    if ( (Number(total) > 0) ){
        window.location = "http://www.tischasia.nyu.edu.sg/object/worldpay_form_page.html?courseList=" + courses + "&courseCost=" + total + "&cartID=" + cartID; 
    }else{
        alert("Please select a class from the list");
    }
} 

function parseCourseList() { 
    var courseNum = "";
    var totalCost = "";    
    var arr= new Array();    
    var info= "";
    //get value of all checked courses
    var checkedCourses = $("form input[@type='checkbox']:checked");
    
    //go through each course and separate out pertinent part
    checkedCourses.each(function() {
        var str = this.value;

        //get everything in string between ( and )
        firstIndex = str.indexOf( "(" ) + 1;
        lastIndex = str.indexOf( ")" );
        info = str.substring(firstIndex, lastIndex);
    
        arr = info.split(" ");
        
        //add up each total cost
        courseNum =  courseNum + arr[0] + "  " ;

        //break the tuition fee into separate strings
        var strArr= arr[1].split("");
        
        var courseCost = "";
        for (var j=0; j<strArr.length; j++){
                //if the string represents an integer, or a period, concatenate the string
                if ( !( isNaN(parseInt(strArr[j]) ))  || strArr[j] == "." ){
                    courseCost= courseCost + strArr[j] ;
                }
        }
       totalCost = Number(totalCost) + Number(courseCost) ;       
    });

    //alert("total cost = " + totalCost);
    var passValueArray = new Array(courseNum, totalCost);
    return passValueArray; 
} 

function generateRandom(){ 
    var currentTime = new Date(); 
    var cartID = currentTime.getDate()+"_"+currentTime.getMinutes()+"_"+currentTime.getSeconds()+"_"+Math.floor(Math.random()*100642 ) ; 
    //document.write("random cartID " + cartID); 
    return cartID; 
} 

function getPassedValue(key){ 
    //parse the passedvalue by key from the query string 
    var regex = new RegExp("[\\?&amp;]"+key+"=([^&amp;#]*)"); 
    var qs = regex.exec( window.location.search); 
    if (qs == null){ 
        return ("NO COURSE NUMBER"); 
    }else{ 
        return qs[1]; 
    } 
} 

function getNewSubmitForm(){ 
    //helper function to create the form 
    var worldPayForm = document.createElement("FORM"); 
    //fix this to put into proper ID 
    worldPayForm.id = "worldpayForm";
    worldPayForm.method = "POST"; 

    //test mode
    //worldPayForm.action= "https://select-test.worldpay.com/wcc/purchase"; 

    //production mode
    worldPayForm.action= "https://select.worldpay.com/wcc/purchase"; 

    return worldPayForm; 
} 

function createNewFormElement(inputForm, elementName, elementValue){ 
    //helper function to add elements to the form 
    try{ 
            var newElement = document.createElement("<INPUT type=hidden name='"+elementName+"'>"); 
        }catch(err){ 
            var newElement = document.createElement('input'); 
            newElement.setAttribute('name', elementName); 
            newElement.setAttribute('type', 'hidden'); 
        } 
    inputForm.appendChild(newElement); 
    newElement.value = elementValue; 

    return newElement; 
}