/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */



var totalcost = 0;
var numanimals = 0;

function checkAnimals()
{
    var animalselector = document.getElementById("animals");
 //   <option value = "1">Tiger $2000</option>
 //   <option value = "2">Elephant $1900</option>
 //   <option value = "3">Chimpanzee $1800</option>
 //   <option value = "4">Warthog $1050</option>
 //   <option value = "5">Lemur $180</option>
    numanimals = 0;
    totalcost = 0;

    if (animalselector[0].selected)
        {
            numanimals++;
            totalcost+=2000;
        }
    if (animalselector[1].selected)
        {
            numanimals++;
            totalcost+=1900;
        }
    if (animalselector[2].selected)
        {
            numanimals++;
            totalcost+=1800;
        }
    if (animalselector[3].selected)
        {
            numanimals++;
            totalcost+=1050;
        }
    if (animalselector[4].selected)
        {
            numanimals++;
            totalcost+=190;
        }
    return numanimals>0;
}
function checkCard()
{
    var cardinput = document.getElementById("cardnum");
    var cardnumber = cardinput.value;
    var numdigits = 0;
    var len = cardnumber.length;

    for(var i = 0; i<len; i++)
    {
        var ch = cardnumber.charAt(i);
        if ((ch >='0') && (ch <= '9'))
    {
        numdigits++;
        }
    }

    return numdigits == 16;
}

function checkCardName()
{
    var cardnumber = document.getElementById("cardnum");
    var cardinput = document.getElementById("cardname");
    if (cardinput[0].selected)
        {
            if (cardnumber.value.charAt(0) == '4')
                {
                    return true;
                }
                else
                    return false;
        }
        if (cardinput[1].selected)
        {
            if (cardnumber.value.charAt(0) == '5')
                {
                    return true;
                }
                else
                    return false;
        }
        else
            return false;
}


function confirmSubmit()
{
   if (!checkAnimals())
       {
           alert("You didn't select an animal to sponsor");
           return false;
       }
   else if (!checkCard())
       {
           alert("Your credit card details are invalid");
           return false;
       }
   else if (!checkCardName())
       {
           alert("Your credit card details are invalid (try 4 or 5 as the first digit)");
           return false;
       }
//  alert("nurrrrrrrrr");
   else
    {
       msg = "Thankyou for offering to sponsor ";
       if (numanimals == 1) msg = msg + "one of our zoo's residents.";
       else msg = msg + numanimals + " of our zoo's residents.";
       msg = msg + "The cost of sponsorship is $" + totalcost;
       msg = msg + ". Confirm order.";
       return confirm(msg);
    }
}