// JavaScript Document
/* This script is Copyright (c) Paul McFedries and 
Logophilia Limited (http://www.mcfedries.com/).
Permission is granted to use this script as long as 
this Copyright notice remains in place.*/



function CalculateTotal(frm) {
    var order_total = 0
	var credit_total = 0
	var keyword_total = 0
	var credit_base = .03
	var keyword_base = 10	


			
			var credit_quantity_element = document.getElementById('credit-quantity');
			var credit_quantity = credit_quantity_element.value.replace(",","");
			
			
			var credit_price_element = document.getElementById('credit-price');
			var credit_price = credit_price_element.value; 
			
			credit_total = (credit_price - credit_base) * credit_quantity
			
			
			var keyword_quantity_element = document.getElementById('keyword-quantity'); 
			var keyword_quantity = keyword_quantity_element.value.replace(",","");
			
			var keyword_price_element = document.getElementById('keyword-price'); 
			var keyword_price = keyword_price_element.value
 
			
			keyword_total = (keyword_price - keyword_base) * keyword_quantity
			
			order_total = credit_total + keyword_total
		

    // Display the total rounded to two decimal places
    frm.total.value = round_decimals(order_total, 2)
}

function round_decimals(original_number, decimals) {
    var result1 = original_number * Math.pow(10, decimals)
    var result2 = Math.round(result1)
    var result3 = result2 / Math.pow(10, decimals)
    return pad_with_zeros(result3, decimals)
}

function pad_with_zeros(rounded_value, decimal_places) {

    // Convert the number to a string
    var value_string = rounded_value.toString()
    
    // Locate the decimal point
    var decimal_location = value_string.indexOf(".")

    // Is there a decimal point?
    if (decimal_location == -1) {
        
        // If no, then all decimal places will be padded with 0s
        decimal_part_length = 0
        
        // If decimal_places is greater than zero, tack on a decimal point
        value_string += decimal_places > 0 ? "." : ""
    }
    else {

        // If yes, then only the extra decimal places will be padded with 0s
        decimal_part_length = value_string.length - decimal_location - 1
    }
    
    // Calculate the number of decimal places that need to be padded with 0s
    var pad_total = decimal_places - decimal_part_length
    
    if (pad_total > 0) {
        
        // Pad the string with 0s
        for (var counter = 1; counter <= pad_total; counter++) 
            value_string += "0"
        }
    return value_string
}