/*

* 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
* keydown fixes by Thasmo <http://thasmo.com>

*/

(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
                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 = 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 keypad numbers, 0 to 9
                if (code >= 96 && code <= 105) functional = true;

                // check Backspace, Tab, Enter, and left/right arrows
                if (code == 8) functional = true;
                if (code == 9) functional = true;
                if (code == 13) functional = true;
                if (code == 37) functional = true;
                if (code == 39) 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);