/**
 * 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: 1.0.2
 * Note: Requires jquery 1.2 or above from version 1.0.1
 *
 * Modified by John Van Der Loo (geekyjohn.com) to support stopping auto scroll
 * and auto resume after an interval
 */
(function($) {                                          // Compliant with jquery.noConflict()
	$.fn.jCarouselLite = function(o) {
		var timer, GO_SRC_BUTTON = 'button', GO_SRC_AUTO = 'auto';
		o = $.extend({
			btnPrev: null,
			btnNext: null,
			btnGo: null,
			mouseWheel: false,
			auto: null,
			autoStopOnUse:true, // true = stop the auto scrolling when carousel interacted with
			autoResumeInterval:0, //if > 0 will enable the carousel to auto-restart after an interval.
			
			speed: 200,
			easing: null,
	
			vertical: false,
			circular: true,
			visible: 3,
			start: 0,
			scrollAmount: 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+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);   // 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
	
			if(o.btnPrev) {
				$(o.btnPrev).click(function() {
					return go(curr-o.scrollAmount, GO_SRC_BUTTON);
				});
			}
	
			if(o.btnNext) {
				$(o.btnNext).click(function() {
					return go(curr+o.scrollAmount, GO_SRC_BUTTON);
				});
			}
	
			if(o.btnGo) {
				$.each(o.btnGo, function(i, val) {
					$(val).click(function() {
						return go(o.circular ? o.visible+i : i, GO_SRC_BUTTON);
					});
				});
			}
	
			if(o.mouseWheel && div.mousewheel) {
				div.mousewheel(function(e, d) {
					return d>0 ? go(curr-o.scrollAmount, GO_SRC_BUTTON) : go(curr+o.scrollAmount, GO_SRC_BUTTON);
				});
			}
	
			if(o.auto) {
				startAuto();
			}
			
			function vis() {
				return li.slice(curr).slice(0,v);
			};
	
			function startAuto() {
				timer = setInterval(function() {
					go(curr+o.scrollAmount, GO_SRC_AUTO);
				}, o.auto+o.speed);
			}
	
			function stopAuto(){
				clearInterval(timer);
			};
	
			function go(to, go_src) {
				if (o.autoStopOnUse && go_src==GO_SRC_BUTTON) {
					stopAuto();
					if (o.autoResumeInterval>0) {
						setTimeout(startAuto,o.autoResumeInterval);
					}
				}
				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.scrollAmount;
						}
						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.scrollAmount;
						}
						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) } , 
						{ 
							duration: o.speed, 
							easing: o.easing,
							complete: function() {
								if(o.afterEnd){
									o.afterEnd.call(this, vis());
								}
								//running = false;
							},
							queue: 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.scrollAmount<0 && o.btnPrev) || (curr+o.scrollAmount > itemLength-v && o.btnNext) || [] ).addClass("disabled");
					}
	
				}
				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);