/**
 * jCarouselLite - jQuery plugin to navigate images/any content in a carousel style widget.
 * @requires jQuery v1.2 or above
 *
 * 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
 * Note: Requires jquery 1.2 or above from version 1.0.1
 *
 *
 * @cat Plugins/Image Gallery
 * @author Ganeshji Marwaha/ganeshread@gmail.com
 * @modifiedby Dan Rades (dan.rades@gmail.com)
 */

(function($) {                                          // Compliant with jquery.noConflict()
$.fn.jCarouselLite = function(o) {
    o = $.extend({
        btnPrev: null,
        btnNext: null,
        btnGo: null,
        mouseWheel: false,
        auto: null,

        speed: 200,
        easing: null,

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

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

    return this.each(function() {                           // Returns the element collection. Chainable.

        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;
		
		o.size = tl;
		o.oldCurr = '';
		o.diff = 0;
		
        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;
		var liSize;
		var liWidth = (o.width) ? o.width : li.width();
		var liHeight = (o.height) ? o.height : li.height();
		if (o.height && o.vertical)
		{
			liSize = o.height;
		}
		else
		{
			liSize = height(li);
		}
		if (o.width && !o.vertical)
		{
			liSize = o.width;
		}
		else
		{
			liSize = width(li);
		}		
	//	var liSize = o.vertical ? height(li) : width(li);   // Full li size(incl margin)-Used for animation
        //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 ulSize = liSize * itemLength;                   // size of full ul(total length, not just for the visible items)
        var divSize = liSize * v;                           // size of entire div(total length for just the visible items)

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

        div.css(sizeCss, divSize+"px");                     // Width of the DIV. length of visible images

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

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

        if(o.btnGo)
            $.each(o.btnGo, function(i, val) {
                $(val).click(function() {
                    return go(o.circular ? o.visible+i : i);
                });
            });

        if(o.mouseWheel && div.mousewheel)
            div.mousewheel(function(e, d) {
                return d>0 ? go(curr-o.scroll) : go(curr+o.scroll);
            });

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

        function vis() {
            return li.slice(curr).slice(0,v);
        };
		
		this.go = function(to)
		{
		
			//return go(o.circular ? o.visible+i : i, 0);
            if(!running) 
			{
                if(o.beforeStart)
                    o.beforeStart.call(this, vis());

                if(o.circular) 
				{            // If circular we are in first or last, then goto the other end
                    if(to<=o.start-v-1) 
					{           // If first, then goto last
                        ul.css(animCss, -((itemLength-(v*2))*liSize)+"px");
                        // If "scroll" > 1, then the "to" might not be equal to the condition; it can be lesser depending on the number of elements.
                        curr = to==o.start-v-1 ? itemLength-(v*2)-1 : itemLength-(v*2)-o.scroll;
                    } 
					else if(to>=itemLength-v+1) 
					{ // If last, then goto first
                        ul.css(animCss, -( (v) * liSize ) + "px" );
                        // If "scroll" > 1, then the "to" might not be equal to the condition; it can be greater depending on the number of elements.
                        curr = to==itemLength-v+1 ? v+1 : v+o.scroll;
                    } 
					else curr = to;
                } 
				else 
				{                    // If non-circular and to points to first or last, we just return.
                    if (to<0 || to>itemLength-v) return;
                    else curr = to;
                }                           // If neither overrides it, the curr will still be "to" and we can proceed.

                running = true;

                ul.css(
                    animCss == "left" ? { left: -(curr*liSize) } : { top: -(curr*liSize) }
                );
				
				if(o.afterEnd)
				{
					o.afterEnd.call(this, vis());
				}
				running = false;				
                // Disable buttons when the carousel reaches the last/first, and enable when not
                if(!o.circular) 
				{
                    $(o.btnPrev + "," + o.btnNext).removeClass("disabled");
					
					if (parseInt(curr) - o.scroll < 0)
					{
						$(o.btnPrev).addClass('disabled');
					}
					if (parseInt(curr) + o.scroll > itemLength - v)
					{
						$(o.btnNext).addClass('disabled');
					}					

                }
			}
		}
        function go(to) {
		
            if(!running) {
				
				var speed = arguments[1] || o.speed;
				
                if(o.beforeStart)
                    o.beforeStart.call(this, vis());

                if(o.circular) 
				{            // If circular we are in first or last, then goto the other end				
                    if(to<=o.start-v-1) 
					{           // If first, then goto last
                        ul.css(animCss, -((itemLength-(v*2))*liSize)+"px");
                        // If "scroll" > 1, then the "to" might not be equal to the condition; it can be lesser depending on the number of elements.
                        curr = to==o.start-v-1 ? itemLength-(v*2)-1 : itemLength-(v*2)-o.scroll;
                    } 
					else if(to>=itemLength-v+1) 
					{ // If last, then goto first
                        ul.css(animCss, -( (v) * liSize ) + "px" );
                        // If "scroll" > 1, then the "to" might not be equal to the condition; it can be greater depending on the number of elements.
                        curr = (to == itemLength - v + 1) ? v + 1 : v + o.scroll;
                    } 
					else curr = to;
                } 
				else 
				{                    // If non-circular and to points to first or last, we just return.
				
                    if( to < 0 || (to > itemLength || to + v - o.scroll >= o.size)) 
					{
						//console.log('return ' + to +'----'+ (to + v));
						return;
					}
                    else curr = to;
                }                           // If neither overrides it, the curr will still be "to" and we can proceed.

                running = true;
				var _curr = curr;

				if (o.diff != 0)
				{
					_curr = _curr - Math.abs(o.diff);				
				}
				
				if (curr + v > o.size)
				{	
					o.diff = o.size - _curr - v;
					_curr = curr + o.diff;					
				}
				else
				{
					o.diff = 0;
				}
				if (_curr < 0)
				{
					_curr = 0;
				}

				o.oldCurr = _curr;
				
                ul.animate(
                    animCss == "left" ? { left: -(_curr*liSize) } : { top: -(_curr*liSize) } , speed, o.easing,
					
                    function() {
                        if(o.afterEnd)
                            o.afterEnd.call(this, vis());
                        running = false;
                    }
                );
                // Disable buttons when the carousel reaches the last/first, and enable when not
                if(!o.circular) {
					o.btnPrev.removeClass("disabled");
					o.btnNext.removeClass("disabled");
					//console.log(curr + '---' + o.scroll + '----' + itemLength + '---' + v + '----' + o.size);
					curr = parseInt(curr);
					if (curr - o.scroll < 0)
					{
						$(o.btnPrev).addClass('disabled');
					}
					if ((curr + o.scroll > itemLength) || (curr + v >= o.size))
					{
						$(o.btnNext).addClass('disabled');
					}
                }

            }

            return false;
        };
    });
};

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

})(jQuery);