(function($) {
    $.fn.priceFormat = function(options) {
        var defaults = {
            prefix: 'US$ ',
            centsSeparator: '.',
            thousandsSeparator: ',',
            limit: false,
            centsLimit: 2,
            clearPrefix: false,
            allowNegative: false
        };
        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;
            var clearPrefix = options.clearPrefix;
            var allowNegative = options.allowNegative;
            // 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
                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;
                }
                // if the string contains a dash, it is negative - add it to the begining (except for zero)
                if (allowNegative && str.indexOf('-') != -1 && (integerVal != 0 || centsVal != 0)) formatted = '-' + formatted;
                // apply the prefix
                if (prefix) formatted = prefix+formatted;
                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);

                // allow key numbers, 0 to 9
                if((code >= 48 && code <= 57) || (code >= 96 && code <= 105)) functional = true;

                // check Backspace, Tab, Enter, Delete, and left/right arrows
                if (code ==  8) functional = true;
                if (code ==  9) functional = true;
                if (code == 13) functional = true;
                if (code == 46) functional = true;
                if (code == 37) functional = true;
                if (code == 39) functional = true;
                if (allowNegative && (code == 189 || code == 109)) functional = true; // dash as well

                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);
            }

            // Add prefix on focus
            function add_prefix() {
                var val = obj.val();
                obj.val(prefix + val);
            }

            // Clear prefix on blur if is set to true
            function clear_prefix() {
                if($.trim(prefix) != '' && clearPrefix) {
                    var array = obj.val().split(prefix);
                    obj.val(array[1]);
                }
            }

            // bind the actions
            $(this).bind('keydown', key_check);
            $(this).bind('keyup', price_it);

            // Clear Prefix and Add Prefix
            if(clearPrefix) {
                $(this).bind('focusout', function() {
                    clear_prefix();
                });

                $(this).bind('focusin', function() {
                    add_prefix();
                });
            }

            // If value has content
            if ($(this).val().length>0) {
                price_it();
                clear_prefix();
            }
        });
    };
})(jQuery);