/* 

Twirlie - jQuery animation made simple
Debashis Chakraborty and Qiming Weng
http://www.designerinfusion.com/

Twirlie is licensed under MIT and GPL licenses.

Created: November 13, 2009
Last updated: December 14, 2009

Version 1.1

*/

(function($){

    $.fn.twirlie = function(options) {

        var defaults = {
            transtime   : 500,
            nextSel     : '.next',
            prevSel     : '.prev'
        };

        var options = $.extend(defaults, options);

        this.each(function() {
            var obj = $(this);
            var next = options.nextSel;
            var prev = options.prevSel;
            var current = 0;
            var total = $('img.slide', obj).size();
            var width = parseInt(($(obj).css("width")).substring(0, ($(obj).css("width")).length-2));

            $(obj).data('current', current);
            $(obj).data('width', width);
            $(obj).data('transtime', options.transtime);

            $(next).click(function() {
                current = $(obj).data("current");
                current += 1;
                if (current == total) {
                    $(next).css('visibility','hidden');
                    current = 0;
                }
                else if (current+1 == total) {
                    $(next).css('visibility','hidden');
                    obj.gotoSlide(current+1);
                }
                else {
                    $(next).css('visibility','visible');
                    obj.gotoSlide(current+1);
                }
                $(prev).css('visibility','visible');
                return false;
            });

            $(prev).click(function() {
                current = $(obj).data("current");
                current -= 1;
                if (current < 0) {
                    current = 0;
                    $(prev).css('visibility','hidden');
                }
                else if (current == 0) {
                    $(prev).css('visibility','hidden');
                    obj.gotoSlide(current+1);
                }
                else {
                    $(prev).css('visibility','visible');
                    obj.gotoSlide(current+1);
                }
                $(next).css('visibility','visible');
                return false;
            });

        });

        return this;
        
    }

    $.fn.gotoSlide = function(slide) {
        var width = parseInt($(this).data("width"));
        var transtime = $(this).data("transtime");
        $('div', this).stop().animate({
            left: (slide-1)*(0-width) + "px"
        }, transtime);
        $(this).data("current", slide-1);
    }

})(jQuery);