/*
 * Price Format jQuery Plugin
 * By Eduardo Cuducos
 * cuducos [at] gmail [dot] com
 * Version: 1.1
 * Release: 2009-02-10
 * original char limit by Fl�vio Silveira <http://flaviosilveira.com>
 * original keydown event attachment by Kaihua Qi
 */
(function($){

    $.fn.priceFormat = function(options){
    
        var defaults = {
            prefix: ' US$ ',
            centsSeparator: '.',
            thousandsSeparator: ',',
            limit: false,
            centsLimit: 2
        };
        
        var options = $.extend(defaults, options);
        
        return this.each(function(){
        
            // pre defined options
            var obj = $(this);
            var is_number = /[0-9]/;
            
            // load the pluggings settings
            var prefix = options.prefix;
            var centsSeparator = options.centsSeparator;
            var thousandsSeparator = options.thousandsSeparator;
            var limit = options.limit;
            var centsLimit = options.centsLimit;
            
            // skip everything that isn't a number
            // and also skip the left zeroes
            function to_numbers(str){
                var formatted = '';
                for (var i = 0; i < (str.length); i++) {
                    char = str.charAt(i);
                    if (formatted.length == 0 && char == 0) {
						char = false;
					}
                    if (char && char.match(is_number)) {
                        if (limit) {
                            if (formatted.length < limit) 
                                formatted = formatted + char;
                        }
                        else {
                            formatted = formatted + char;
                        }
                    }
                }
                return formatted;
            }
            
            // format to fill with zeros to complete cents chars
            function fill_with_zeroes(str){
                while (str.length < (centsLimit + 1)) 
                    str = "0"+str;
                return str;
            }
            
            // format as price
            function price_format(str){
            
                // formatting settings
               if (str.length < 1)               	return;var formatted = fill_with_zeroes(to_numbers(str));
                var thousandsFormatted = '';
                var thousandsCount = 0;
                
                // split integer from cents			
                var centsVal = formatted.substr(formatted.length - centsLimit, centsLimit);
                var integerVal = formatted.substr(0, formatted.length - centsLimit);
                
                // apply cents pontuation
                formatted = integerVal + centsSeparator + centsVal;
                
                // apply thousands pontuation
                if (thousandsSeparator) {
                    for (var j = integerVal.length; j > 0; j--) {
                        char = integerVal.substr(j - 1, 1);
                        thousandsCount++;
                        if (thousandsCount % 3 == 0) 
                            char = thousandsSeparator + char;
                        thousandsFormatted = char + thousandsFormatted;
                    }
                    if (thousandsFormatted.substr(0, 1) == thousandsSeparator) 
                        thousandsFormatted = thousandsFormatted.substring(1, thousandsFormatted.length);
                    formatted = thousandsFormatted + centsSeparator + centsVal;
                }
                
                // apply the prefix
                if (prefix) 
                    formatted = formatted + prefix;
                
                return formatted;
                
            }
            
            // filter what user type (only numbers and functional keys)
            function key_check(e){
            
                var code = (e.keyCode ? e.keyCode : e.which);
                var typed = String.fromCharCode(code);
                var functional = false;
                var str = obj.val();
                var newValue = price_format(str + typed);
                
                // check Backspace, Tab, Enter
                if (code == 8) 
                    functional = true;
                if (code == 9) 
                    functional = true;
                if (code == 13) 
                    functional = true;
                
                if (!functional) {
                    e.preventDefault();
                    e.stopPropagation();
                    if (str != newValue) 
                        obj.val(newValue);
                }
                
            }
            
            // inster formatted price as a value of an input field
            function price_it(){
                var str = obj.val();
                var price = price_format(str);
                if (str != price) 
                    obj.val(price);
            }
            
            // bind the actions
            $(this).bind('keydown', key_check);
            $(this).bind('keyup', price_it);
            if ($(this).val().length > 0) 
                price_it();
            
        });
        
    };
    
})(jQuery);