/**
 * jCarouselLite - jQuery plugin to navigate images/any content in a carousel style widget.
 * http://gmarwaha.com/jquery/jcarousellite/
 *
 * Copyright (c) 2007 Ganeshji Marwaha (gmarwaha.com)
 * Dual licensed under the MIT and GPL licenses:
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 * Version: 1.0.1
 *
 * Changes made by Manoel Neto (manoel@formaecor.com.br)
 * Date Change: 14/11/2010
 * 1. Add buttons Pause and Play
 * 2. Add var timeOut 
 * 3. Change var auto for accept only boolean 
 */

(function($) {                                          
$.fn.jCarouselLite = function(o) {
    o = $.extend({
        btnPrev: null,
        btnNext: null,
        btnGo: null,
        btnPause: null,
        mouseWheel: false,
        auto: false,
		
		timeOut: 3000, 
        speed: 500,
        easing: null,

        vertical: false,
        circular: true,
        visible: 3,
        start: 0,
        scroll: 1,

        beforeStart: null,
        afterEnd: null
    }, o || {});

    return this.each(function() {                           

        var running = false, animCss=o.vertical?"top":"left", sizeCss=o.vertical?"height":"width";
        var div = $(this), ul = $("ul", div), tLi = $("li", ul), tl = tLi.size(), v = o.visible;
		var autoInterval;

        if(o.circular) {
            ul.prepend(tLi.slice(tl-v-1+1).clone())
              .append(tLi.slice(0,v).clone());
            o.start += v;
        }

        var li = $("li", ul), itemLength = li.size(), curr = o.start;
        div.css("visibility", "visible");

        li.css({overflow: "hidden", float: o.vertical ? "none" : "left"});
        ul.css({margin: "0", padding: "0", position: "relative", "list-style-type": "none", "z-index": "1"});
        div.css({overflow: "hidden", position: "relative", "z-index": "2", left: "0px"});

        var liSize = o.vertical ? height(li) : width(li);
        var ulSize = liSize * itemLength;
        var divSize = liSize * v;

        li.css({width: li.width(), height: li.height()});
        ul.css(sizeCss, ulSize+"px").css(animCss, -(curr*liSize));

        div.css(sizeCss, divSize+"px");
		if ( o.auto )
		{		
			$(o.btnPlay).hide();
			$(o.btnPause).show();
		}
		else
		{
			$(o.btnPlay).show();
			$(o.btnPause).hide();
		}

        if(o.btnPrev)
            $(o.btnPrev).click(function() {
                return go(curr-o.scroll);
            });

        if(o.btnNext)
            $(o.btnNext).click(function() {
                return go(curr+o.scroll);
            });

        if(o.btnGo)
            $.each(o.btnGo, function(i, val) {
                $(val).click(function()
				{
					clearInterval( autoInterval );
                    return go(o.circular ? o.visible+i : i);
                });
            });
	
		if(o.btnPause)
		{
            $(o.btnPause).click(
			function()
			{	
				clearInterval( autoInterval );
				$(o.btnPlay).show();
				$(o.btnPause).hide();
            });				
		}
			
		if(o.btnPlay)
            $(o.btnPlay).click(function()
			{	
				clearInterval( autoInterval );
				autoInterval = setInterval(function() { go(curr+o.scroll); }, o.timeOut+o.speed);
				$(o.btnPlay).hide();
				$(o.btnPause).show();				
				return go(curr+o.scroll);
            });			
		
        if(o.mouseWheel && div.mousewheel)
            div.mousewheel(function(e, d) {
                return d>0 ? go(curr-o.scroll) : go(curr+o.scroll);
            });

        if(o.auto)
            autoInterval = setInterval(function() { go(curr+o.scroll); }, o.timeOut+o.speed);

        function vis()
		{
            return li.slice(curr).slice(0,v);
        };

        function go(to) {
            if(!running) {

                if(o.circular)
				{            
                    if(to<=o.start-v-1)
					{
                        ul.css(animCss, -((itemLength-(v*2))*liSize)+"px");
                        curr = to==o.start-v-1 ? itemLength-(v*2)-1 : itemLength-(v*2)-o.scroll;
                    }
					else if(to>=itemLength-v+1)
					{
                        ul.css(animCss, -( (v) * liSize ) + "px" );
                        curr = to==itemLength-v+1 ? v+1 : v+o.scroll;
                    }
					else
					{
						curr = to;
					}
                }
				else
				{                    
                    if(to<0 || to>itemLength-v)
					{
						return;
					}
                    else
					{
						curr = to;
					}
                }
				
                if(o.beforeStart)
				{
                    o.beforeStart.call(this, curr );
				}

                running = true;

                ul.animate(
                    animCss == "left" ? { left: -(curr*liSize) } : { top: -(curr*liSize) } , o.speed, o.easing,
                    function() {
                        if(o.afterEnd)
						{
                            o.afterEnd.call(this, vis());
						}
                        running = false;
                    }
                );

                if(!o.circular) {
                    $(o.btnPrev + "," + o.btnNext).removeClass("disabled").css( { cursor: 'pointer' } ).animate( { opacity: 1 } );
                    $( (curr-o.scroll<0 && o.btnPrev)
                        ||
                       (curr+o.scroll > itemLength-v && o.btnNext)
                        ||
                       []
                     ).addClass("disabled").css( { cursor: 'default' } ).animate( { opacity: .5 } );
                }

            }
            return false;
        };
    });
};

function css(el, prop) {
    return parseInt($.css(el[0], prop)) || 0;
};
function width(el) {
    return  el[0].offsetWidth + css(el, 'marginLeft') + css(el, 'marginRight');
};
function height(el) {
    return el[0].offsetHeight + css(el, 'marginTop') + css(el, 'marginBottom');
};

})(jQuery);