// keep track of what they're currently using
var additionalRadio = false;
var currentCartItem = 0;
var totalBooklets = 0;

function formatDollars(aNumber) {
	if (aNumber > 0) {
		aNumber = aNumber.toString();
		aNumber = aNumber.substring(0,aNumber.length - 2) + '.' + aNumber.substr(aNumber.length - 2);
		return aNumber;
	} else {
		return '0.00';
	}
}

function normalizeQuantities() {
	if (! (document.orderForm.gleo_quant.value >= 0)) {
		document.orderForm.gleo_quant.value = 0;
	}
	
	if (! (document.orderForm.image_quant.value >= 0)) {
		document.orderForm.image_quant.value = 0;
	}
	
	if (! (document.orderForm.dnapi_quant.value >= 0)) {
		document.orderForm.dnapi_quant.value = 0;
	}
	
	if (! (document.orderForm.agc_quant.value >= 0)) {
		document.orderForm.agc_quant.value = 0;
	}
	
	if (! (document.orderForm.additional.value >= 0)) {
		document.orderForm.additional.value = 0;
	}
}	

function calculateTotals() {
	var subtotal = 0;
	var shipping = 0;
	var total = 0;
	var additional;
	
	normalizeQuantities();
	
	// figure out the additional contribution
	additional = Math.round(Number(document.orderForm.additional.value) * 100);
	
	document.orderForm.additional_opt[0].checked = false;
	document.orderForm.additional_opt[1].checked = false;
	document.orderForm.additional_opt[2].checked = false;
	if (document.orderForm.additional_opt[0].value * 100 == additional)
		document.orderForm.additional_opt[0].checked = true;
	else if (document.orderForm.additional_opt[1].value * 100 == additional)
		document.orderForm.additional_opt[1].checked = true;
	else if (additional > 0)
		document.orderForm.additional_opt[2].checked = true;
	
	// things are measured as integers (cents) to prevent javascript rounding errors
	
	// god loves each one / made in god's image
	if ((Number(document.orderForm.gleo_quant.value) + Number(document.orderForm.image_quant.value) + Number(document.orderForm.dnapi_quant.value) + Number(document.orderForm.agc_quant.value)) < 10) {
		document.orderForm.gleo_cost.value = document.orderForm.gleo_quant.value * 700;
		document.orderForm.image_cost.value = document.orderForm.image_quant.value * 700;
		document.orderForm.dnapi_cost.value = document.orderForm.dnapi_quant.value * 700;
		document.orderForm.agc_cost.value = document.orderForm.agc_quant.value * 700;
	} else {
		document.orderForm.gleo_cost.value = document.orderForm.gleo_quant.value * 500;
		document.orderForm.image_cost.value = document.orderForm.image_quant.value * 500;
		document.orderForm.dnapi_cost.value = document.orderForm.dnapi_quant.value * 500;
		document.orderForm.agc_cost.value = document.orderForm.agc_quant.value * 500;
	}
	subtotal += document.orderForm.gleo_cost.value * 1;
	subtotal += document.orderForm.image_cost.value * 1;
	subtotal += document.orderForm.dnapi_cost.value * 1;
	subtotal += document.orderForm.agc_cost.value * 1;
	
	// calculate shipping
	totalBooklets = Number(document.orderForm.gleo_quant.value) + Number(document.orderForm.image_quant.value) + Number(document.orderForm.dnapi_quant.value) + Number(document.orderForm.agc_quant.value);
	if (totalBooklets > 0)
		shipping = 600;
	if (totalBooklets > 1)
		shipping += 150 * (totalBooklets - 1);
	if (shipping > 1500)
		shipping = 1500;

	total = subtotal + shipping + additional;

	// calculated fields
	document.orderForm.subtotal.value = formatDollars(subtotal);
	document.orderForm.shipping.value = formatDollars(shipping);
	document.orderForm.total.value = formatDollars(total);

	document.orderForm.additional.value = formatDollars(additional);
	document.orderForm.additional_cost.value = formatDollars(additional);
	
	// cost holders
	document.orderForm.gleo_cost.value = document.orderForm.gleo_sub.value = formatDollars(document.orderForm.gleo_cost.value);
	document.orderForm.image_cost.value = document.orderForm.image_sub.value = formatDollars(document.orderForm.image_cost.value);
	document.orderForm.dnapi_cost.value = document.orderForm.dnapi_sub.value = formatDollars(document.orderForm.dnapi_cost.value);
	document.orderForm.agc_cost.value = document.orderForm.agc_sub.value = formatDollars(document.orderForm.agc_cost.value);
}

function validate() {
	var email_p = /^(.+\@.+\..+)$/;
	var ccNum_p = /^[0-9]{16}$/;
	
	calculateTotals();

	if (document.orderForm.total.value == '0.00') {
		alert('Please order at least one booklet or make a contribution.');
		document.orderForm.image_quant.focus();
		return false;
	}
	
	if ((totalBooklets >= 6) && (totalBooklets < 10)) {
		if (! confirm('We noticed you\'ve ordered ' + totalBooklets + ' booklets - if you increase your order to 10, you\'ll save money and have extra to share.\r\rPress "OK" to continue with your order as is, or "Cancel" to edit your choices.')) {
			return false;
		}
	}	

	return true;
}

function addCartItem(name, price, quantity) {
	currentCartItem++;
	document.paypalForm['item_name_' + currentCartItem].value = name;
	document.paypalForm['amount_' + currentCartItem].value = formatDollars((price * 100) / quantity);
	document.paypalForm['quantity_' + currentCartItem].value = quantity;
	document.paypalForm['shipping_' + currentCartItem].value = 0;
}

function addCartItemFromPrefix(prefix) {
	if (Number(document.orderForm[prefix + '_quant'].value) > 0) {
		addCartItem(document.orderForm[prefix + '_name'].value, document.orderForm[prefix + '_sub'].value, document.orderForm[prefix + '_quant'].value);
	}
}

function resetPayPalPayment() {
	for (var i = 1; i <= 6; i++) {
		document.paypalForm['item_name_' + i].value = '';
		document.paypalForm['amount_' + i].value = '';
		document.paypalForm['quantity_' + i].value = '';
	}

	currentCartItem = 0;
}

function doPayPalPayment() {
	resetPayPalPayment();

	addCartItemFromPrefix('gleo');	
	addCartItemFromPrefix('image');	
	addCartItemFromPrefix('dnapi');	
	addCartItemFromPrefix('agc');	
	
	if (Number(document.orderForm.additional.value) > 0) {
		addCartItem('Contribution', document.orderForm.additional.value, 1);	
	}
	
	document.paypalForm.shipping_1.value = Number(document.orderForm.shipping.value);
	
	return true;
}