/**
 * 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
 *		 Modified by Giovanni Arciprete - Internetstores AG
 */


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

		speed: 200,
		easing: null,

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

		sizeDiv: null,
		sizeLi: null,

		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 = $j(this), ul = $j("ul", div), tLi = $j("li", ul), tl = tLi.size(), v = o.visible;

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

        var li = $j("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 = calcSize(); //o.vertical ? height(li,false) : width(li,false);	// Full li size(incl margin)-Used for animation
		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)
		if(o.sizeDiv) { var liSizeWithoutCSS = o.vertical ? liSize - height(li,true) : liSize - width(li,true); }

		if(o.vertical) {
			var liW = o.sizeLi ? o.sizeLi : li.width();
			var liH = o.sizeDiv ? liSizeWithoutCSS : li.height();
		}
		else {
			var liW = o.sizeDiv ? liSizeWithoutCSS : li.width();
			var liH = o.sizeLi ? o.sizeLi : li.height();
		}

		li.css({width: liW, height: liH});
		ul.css(sizeCss, ulSize+"px").css(animCss, -(curr*liSize));
		div.css(sizeCss, divSize+"px");                     // Width of the DIV. length of visible images
		

		var intervalPrev = false;
		var intervalNext = false;

		if(o.mouseOver){
			if(o.btnPrev){
				$j(o.btnPrev).hover(
					function(){ intervalPrev = true;  },
					function(){ intervalPrev = false; }
				);
			}

			if(o.btnNext){
				$j(o.btnNext).hover(
					function(){ intervalNext = true; },
					function(){ intervalNext = false; }
				);
			}

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

			setInterval(function() {
					if(intervalNext){ go(curr+o.scroll); }
			}, o.auto+o.speed);
		}
		else {
			if(o.btnPrev){
				$j(o.btnPrev).click(function() {
					return go(curr-o.scroll);
				});
			}

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

		if(o.btnGo){
			$j.each(o.btnGo, function(i, val) {
				$j(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);
        };

        function go(to) {
            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.animate(
                    animCss == "left" ? { left: -(curr*liSize) } : { top: -(curr*liSize) } , o.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) {
                    $j(o.btnPrev + "," + o.btnNext).removeClass("disabled");
                    $j( (curr-o.scroll<0 && o.btnPrev) || (curr+o.scroll > itemLength-v && o.btnNext) || [] ).addClass("disabled");
                }

            }
            return false;
        }

		function calcSize(){
			if(o.sizeDiv){
				return Math.ceil(o.sizeDiv / o.visible);
			}
			else { return o.vertical ? height(li,false) : width(li,false); }
		}
    });
};

function css(el, prop) {
    return parseInt($j.css(el[0], prop), 10) || 0;
}

function width(el,ok) {
	if(ok){
		return css(el, 'marginLeft') + css(el, 'marginRight');
	}
	else {
		return el[0].offsetWidth + css(el, 'marginLeft') + css(el, 'marginRight');
	}
}

function height(el,ok) {
	if(ok){
		return css(el, 'marginTop') + css(el, 'marginBottom');
	}
	else {
		return el[0].offsetHeight + css(el, 'marginTop') + css(el, 'marginBottom');
	}
}

})(jQuery);