/*
 * Christian Bryan
 * christianbryan@gmail.com
 * March 19, 2007
 * 
 */

// This function toggles the display of element named 'cc_area' in the calling document.
// Takes 'on' and 'off' as input. The function is case sensitive.
function display_cc_area(toggle)
{
	var cc_area = document.getElementById("cc_area");
	var pp_area = document.getElementById("pp_area");
	
 	if(toggle == "on")
	{
		cc_area.style.display = "block";
		pp_area.style.display = "none";
	}
	else if(toggle == "off")
	{
		cc_area.style.display = "none";
		pp_area.style.display = "block";

	}
	else
	{
		alert("'display_cc_area()' was passed an unknown value. 'on' and 'off' are the only valid values.");
	}
}


// Function submits a form named 'daisy_chain_form' in the calling document.
function start_daisy_chain()
{
	document.daisy_chain_form.submit();
}

function validate_form()
{
	// Reset any errors that were displayed.
	clear_errors();
	
	// General use variables.
	var fields_missing = 0;
	var fields_malformed = 0;
	var num_alerts = fields_missing + fields_malformed;
		
	// Grab all of the fields we want to validate.
	var first_name = document.getElementById("first_name");
	var last_name = document.getElementById("last_name");
	var email = document.getElementById("email");
	var shirt = document.getElementById("shirt_size");
	
	var street = document.getElementById("dataStreet");
	var city = document.getElementById("dataCity");
	var region = document.getElementById("dataState");
	var zip = document.getElementById("dataZip");
	var country = document.getElementById("dataCountry");
	// Remember to make sure that a credit card type is entered.
	// var cc_number  = document.getElementById("cc_number");
	// var cc_exp_month = document.getElementById("ccExpMonth");
	// var cc_exp_year = document.getElementById("ccExpYear");

	// Get the error fields we want to show/hide.
	var first_name_err = document.getElementById("first_name_miss");
	var last_name_err = document.getElementById("last_name_miss");
	var email_err = document.getElementById("email_err");	
	var email_miss = document.getElementById("email_miss");
	var shirt_size_miss = document.getElementById("shirt_size_miss");
	var no_pay_meth = document.getElementById("no_pay_meth");
		
	// Check the first few fields.
	if(first_name.value == "")
	{
		first_name_err.style.display = "block";
		fields_missing++;
	}

	if(last_name.value == "")
	{
		last_name_err.style.display = "block";
		fields_missing++;
	}

	if(email.value == "")
	{
		email_miss.style.display = "block";
		fields_missing++;
	}
	else if(is_valid_email(email.value) == false)
	{
		email_err.style.display = "block";
		fields_malformed++;
	}
	
	if(shirt.value == "none")
	{
		shirt_size_miss.style.display = "block";
		fields_missing++;
	}
	
	if(!document.pcf_form.payment_type[0].checked && !document.pcf_form.payment_type[1].checked)
	{
		fields_missing++;
	}
	
	if(document.pcf_form.payment_type[1].checked)
	{
		// if(street.value = "")
		// {
		// 	fields_missing++;
		// }
		
		// if(city.value = "")
		// {
		//	fields_missing++;
		// }
		
		// if(region.value = "")
		// {
		// 	fields.missing++;
		// }
		
		// if(zip.value = "")
		// {
		// 	fields.missing++;
		// }
		// else if(zip.value.length > 5)
		// {
		// 	fields_malformed++;
		// }
		
		// if(country.value = "")
		// {
		//	fields.missing++;
		// }
		
		
	}
	
	// alert(fields_missing);
	// alert(fields_malformed);
	
	// Exit strategy.
	if((fields_missing + fields_malformed) > 0)
	{
		document.getElementById("error_box").style.display = "block";
		
		if(fields_missing > 0)
		{
			document.getElementById("missing_miss").style.display = "block";
		}
		
		if(fields_malformed > 0)
		{
			document.getElementById("error_err").style.display = "block";
		}
		
		return false;
	}
	else
	{
		return true;
	}
}

function is_valid_email(str)
{
   return (str.indexOf(".") > 2) && (str.indexOf("@") > 0);
}

function check_cc_num(cc_num)
{
	var CardNumber = argc > 0 ? argv[0] : this.cardnumber;

	var no_digit = CardNumber.length;
	var oddoeven = no_digit & 1;
	var sum = 0;

	for(var count = 0; count < no_digit; count++)
	{
		var digit = parseInt(CardNumber.charAt(count));
		if (!((count & 1) ^ oddoeven))
		{
			digit *= 2;
			if (digit > 9)
			digit -= 9;
		}
		sum += digit;
	}
	
	if(sum % 10 == 0)
	{
		return true;
	}
	else
	{
		return false;
	}
}

function clear_errors()
{
	// Hide the containers
	document.getElementById("error_box").style.display = "none";
	document.getElementById("missing_miss").style.display = "none";
	document.getElementById("error_err").style.display = "none";
	
	// Hide the missing element errors.
	document.getElementById("first_name_miss").style.display = "none";
	document.getElementById("last_name_miss").style.display = "none";
	document.getElementById("shirt_size_miss").style.display = "none";
	document.getElementById("email_miss").style.display = "none";
	document.getElementById("dataStreet_miss").style.display = "none";
	document.getElementById("dataCity_miss").style.display = "none";
	document.getElementById("dataState_miss").style.display = "none";
	document.getElementById("dataCountry_miss").style.display = "none";
	document.getElementById("ccExpYear_miss").style.display = "none";
	document.getElementById("ccExpMonth_miss").style.display = "none";
	document.getElementById("cc_miss").style.display = "none";	
		
	// Hide the malformed field errors.
	document.getElementById("email_err").style.display = "none";
	document.getElementById("cc_err").style.display = "none";
	document.getElementById("dataZip_err").style.display = "none";
}