/**
* 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
*/

(function($) {        
	                                  // Compliant with jquery.noConflict()
	$.fn.jCarouselLite = function(o) {

		o = $.extend({
			btnPrev: null,
			btnNext: null,
			btnGo: null,
			mouseWheel: false,
			auto: null,
			hoverPause: false,

			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;

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

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

			li.css({float: o.vertical ? "none" : "left"});
			ul.css({margin: "0", padding: "0", position: "relative"});
			div.css({overflow: "hidden", position: "relative", left: "0px"});

			var liSize = o.vertical ? height(li) : width(li);   // 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)

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

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

			li.hover(liFadeOver, liFadeOut);

			if(o.btnPrev) {
				$(o.btnPrev).click(function() {
					return go(curr-o.scroll);
				});
				if(o.hoverPause) {
					$(o.btnPrev).hover(function(){stopAuto();}, function(){startAuto();});
				}
			}


			if(o.btnNext) {
				$(o.btnNext).click(function() {
					return go(curr+o.scroll);
				});
				if(o.hoverPause) {
					$(o.btnNext).hover(function(){stopAuto();}, function(){startAuto();});
				}
			}

			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);
			});

			var autoInterval;

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

			function stopAuto() {
				clearInterval(autoInterval);
			};

			if(o.auto) {
				if(o.hoverPause) {
					div.hover(function(){stopAuto();}, function(){startAuto();});
				}
				startAuto();
			};

			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<0) {           // If before range, then go around
							ul.css(animCss, -( (curr + tl) * liSize)+"px");
							curr = to + tl;
						} else if(to>itemLength-v) { // If beyond range, then come around
							ul.css(animCss, -( (curr - tl) * liSize ) + "px" );
							curr = to - tl;
						} 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) {
						$(o.btnPrev + "," + o.btnNext).removeClass("disabled");
						$( (curr-o.scroll<0 && o.btnPrev)
						||
						(curr+o.scroll > itemLength-v && o.btnNext)
						||
						[]
						).addClass("disabled");
					}

				}
				return false;
			};
		});

	};

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


	liFadeOver = function(){
		//$(this).stop(true);
		$(this).find('.fade_bg').css({opacity:0.66});
		$(this).find('.fade_bg').fadeIn('fast');
		$(this).find('.fade_text').fadeIn('fast');
	}
	liFadeOut = function(){
		$(this).find('.fade_bg').fadeOut();
		$(this).find('.fade_text').fadeOut();
	}

})(jQuery);