/**
 * Author: Up and Running Software, Inc.
 *
 * Short Description: Perform verification on a credit card number to determine its type and validity.  
 *
 * Long Description: This contains Javascript code designed to handle the front of the page where the user
 * enters new payment sources.  In particular, it contains methods for validating credit cards using 
 * a mod-10 check and regular expressions.  It also contains methods that interface with the 
 * modular payment processing system to dynamically load and submit payment source forms via AJAX.
 *
 * Library: jQuery
 */
 
function checkCardNumber(cardNum){
	
	// Patterns for matching different credit cards
	var amx = /^3[47][0-9]{13}$/;
	var dc = /^6[0-9]{15}$/;
	var mc = /^5[1-5][0-9]{14}$/;
	var visa = /^4[0-9]{12}([0-9]{3})?$/;
	
	// Flag for mod-10 check
	var luhncheck = false;
	
	// Perform a mod-10 check on the number
	var digits = [];
	var digitsCount = 0;
	var double = false;
	for(var ind = cardNum.length-1; ind >=0; ind--){
		if(double){
			var num = parseInt(cardNum.charAt(ind))*2;
			if(num >= 10){
				digits[digitsCount++] = 1;
				digits[digitsCount++] = num-10;
			}else{
				digits[digitsCount++] = num;
			}
		}else{
			digits[digitsCount++] = parseInt(cardNum.charAt(ind));
		}
		double = !double;
	}
	
	sum = 0;
	for(var ind = 0; ind < digitsCount; ind++){
		sum += parseInt(digits[ind]);
	}
	
	luhncheck = !(sum % 10);
	
	// Throw an error if the number is invalid or does not match any of the accepted card types
	$("#psource_form #card_type_label").text("");
	if((!amx.test(cardNum) && !dc.test(cardNum) && !mc.test(cardNum) && !visa.test(cardNum)) || !luhncheck){
		alert('The Credit Card number you entered is not valid or not a supported card type.  American Express, Discover Card, Mastercard and Visa are accepted.');
	}else{
		// Update the display to show the credit card type
		if(amx.test(cardNum)){
			$("#psource_form #card_type_label").text("American Express");
		}else if (dc.test(cardNum)){
			$("#psource_form #card_type_label").text("Discover Card");
		}else if (mc.test(cardNum)){
			$("#psource_form #card_type_label").text("Master Card");
		}else if (visa.test(cardNum)){
			$("#psource_form #card_type_label").text("Visa Card");
		}		
	}
}

// Track the current payment source type
curType = 0;

/**
 * Load the new payment form if the user wants to add a new payment source
 */
function loadNewPaymentForm(typeid){
	curType = typeid;
	notify_processing();
	$("#paymentFormContainer").load(base_url+"paymentsource/addform/type/"+typeid, '',function(){
		close_notify_processing(false);
	});
}

/**
 * Submit the new payment form to save the data to the database
 */
function savePaymentMethod(){
	form = $("#psource_form");
	form.ajaxError(close_notify_failed_processing);
	form.ajaxSubmit({
		url: base_url + 'paymentsource/savepsource/type/'+curType, 
		success: function(data) {
			
			// JSON data is returned
			var reqdata = eval(data);
			
			// Check whether any errors occurred, if they did display them, otherwise allow the user to use the new payment source to pay for their order
			if(reqdata['status']){
				$('#new_p_source').selectedIndex = 0;
				$("#paymentFormContainer").innerHTML = '';
				$("#selected_payment_sources").innerHTML += "<div style='text-align: left; margin-bottom: 10px;'><div style='float: right; width: 80px; text-align: right;'><input id='ps"+(psCount++)+"' name='ps["+reqdata['id']+"]' type='text' value='$0.00' style='width: 70px; text-align: right;' onchange='checkSubmit(1);'></div>"+reqdata['name']+"<div style='clear: both;'></div></div>";
			}else{
				var errors = '<ul>';
				for(key in reqdata['errors']){
					var error = reqdata['errors'][key];
					errors += '<li>'+error+'</li>';
        			}
        			errors += '</ul>';
        			$.jGrowl(errors, {sticky:true, open:jgrowl_open, close:jgrowl_close});
        		}
		}
	});
}

/**
 * Verify that the user has allocated enough money from all of their payment sources to cover the order
 */
function checkSubmit(mode){
	
	// Count the payment sources
	var curPs = 0;
	try {
		curIn = $('#ps'+curPs);
		if(!curIn)
			curPs++;
	}catch(e){
		curPs++;
	}
	
	// Count the total payments
	var totalPayments = 0;
	try {
		var curIn;
		while(curIn = $('#ps'+curPs)){
			
			var amount = parseFloat(curIn.value.replace('$',''));
			if(amount > 0){
				totalPayments += amount;
			}
			
			curPs++;
		}
	}catch(e){}
	
	// Check and output the remaining balance
	var remaining;
	try {
		remaining =  parseFloat($('#item_total_box').innerHTML.replace('$',''));
		try {
			var curbox = null;
			var curboxnum = 0;
			var boxval;
			while(curbox = $('#invstip-'+curboxnum)){
				boxval = parseFloat(curbox.value.replace('$',''));
				
				if(boxval > 0){
					remaining += boxval;
				}
				
				curboxnum++;
			}
		}catch(e2){}
		
		try {
			var curbox = null;
			var curboxnum = 0;
			var boxval;
			while(curbox = $('#locked-invstip-'+curboxnum)){
				boxval = parseFloat(curbox.innerHTML.replace('$',''));
				
				if(boxval > 0){
					remaining += boxval;
				}
				
				curboxnum++;
			}
		}catch(e2){}
	}catch(e){
		remaining = parseFloat('<?php echo $this->initial_balance; ?>');
	}
	
	// Make the remaining value pretty
	remaining = (remaining-totalPayments)
	var remaining_pretty = Math.round(remaining*100);
	remaining_pretty = '$'+remaining_pretty;
	
	if(remaining_pretty == '$0') remaining_pretty = '$000' // 100*0 = 0
	
	remaining_pretty = remaining_pretty.substr(0,remaining_pretty.length-2)+"."+remaining_pretty.substr(remaining_pretty.length-2,2);
	
	try {
		$('#remaining_balance').innerHTML = remaining_pretty;
	}catch(e){}
	
	// If errors are enabled, throw one if the total is not enough
	if(mode != 1){
		if(remaining == 0){
			$('#order_status_form').submit();
		}else{
			alert('The payment amounts you entered for this order do not add up to the total balance due.');
		}
	}
}

var curPSnum;

// Close the CCV prompt
function cancelCVV(){
	$("#cvv-model-dialog").dialog('close');
}

/**
 * If the user chooses a credit card based payment method they must enter a CCV value.
 * This method prompts for one and performs basic validation on it.
 */
function checkCVV(){
	var cvv = parseInt($('#cvvconfirm').value);
	if(cvv > 0){
		$('#cvv'+curPSnum).value = cvv;
		$('#cvvconfirm').value = '';
		cancelCVV();
		checkSubmit();
	}else{
		alert('The CVV number you entered does not appear to be valid.');
	}
}