/*
 * 	loopedCarousel 0.5 - jQuery plugin
 *	written by Nathan Searles, based on loopedSlider (http://github.com/nathansearles/loopedSlider)	
 *	http://github.com/nathansearles/loopedCarousel
 *
 *	Copyright (c) 2009 Nathan Searles (http://nathansearles.com/)
 *	Dual licensed under the MIT (MIT-LICENSE.txt)
 *	and GPL (GPL-LICENSE.txt) licenses.
 *
 *	Built for jQuery library
 *	http://jquery.com
 *
 */

/*
 *	markup example for $("#loopedCarousel").loopedCarousel();
 *
 *	<div id="loopedCarousel">	
 *		<div class="container">
 *			<div class="slides">
 *				<div>1</div>
 *				<div>2</div>
 *				<div>3</div>
 *				<div>4</div>
 *				<div>5</div>
 *				<div>6</div>
 *				<div>7</div>
 *				<div>8</div>
 *				<div>9</div>
 *				<div>10</div>
 *				<div>11</div>
 *				<div>12</div>
 *				<div>13</div>
 *				<div>14</div>
 *				<div>15</div>
 *			</div>
 *		</div>
 *		<a href="#" class="previous">previous</a>
 *		<a href="#" class="next">next</a>	
 *	</div>
 *
 */

(function($) {
	$.fn.loopedCarousel = function(options) {
		
	var defaults = {			
		container: '.carousel-container',
		slides: '.slides',
		pagination: '.pagination',
		autoStart: 0, // Set to positive number for auto interval and interval time
		slidespeed: 800, // Speed of slide animation
		fadespeed: 300, // Speed of fade animation
		items: 4, // Items show
		padding: 16, // Padding between items
		showPagination: false, // Shows pagination links
		vertical: false
	};
		
	this.each(function() {	
		var obj = $(this);
		var o = $.extend(defaults, options);
		var i = o.items;
		var m = 0;
		var t = 1;
		var s = $(o.slides,obj).children().size();
		var w = $(o.slides,obj).children().outerWidth()+o.padding;
		var h = $(o.slides,obj).children().outerHeight()+o.padding;
		var c = Math.ceil($(o.slides,obj).children().size()/i);
		var pd = o.padding/2;
		var p = 0;
		var u = false;
		var n = 0;
		var pt = 0;
		var os = i*c-s;
		var params = {}; 
		
		if (o.vertical===true) { w = h; }
			
		if(o.showPagination){
			var buttons = s/i;
			$(obj).append('<ul class="pagination">');
			$(o.slides,obj).children().each(function(){
				if (n<buttons) {
					$(o.pagination,obj).append('<li><a rel="'+(n+1)+'" href="#" >'+(n+1)+'</a></li>');
					n = n+1;
				} else {
					n = 0;
					return false;
				}
				$(o.pagination+' li a:eq(0)',obj).parent().addClass('active');
			});
		}
		
		if (o.vertical===true) {
			$(o.container,obj).css({height:(w*i)});
			$(o.slides,obj).css({height:(s*w)});
		} else {
			$(o.container,obj).css({width:(w*i)});
			$(o.slides,obj).css({width:(s*w)});
		}
		
		$(o.slides,obj).children().each(function(){
			if (o.vertical===true) {
				$(this).css({position:'absolute',top:p+pd,display:'block'});
			} else {
				$(this).css({position:'absolute',left:p+pd,display:'block'});
			}
			p=p+w;
		});

		$(o.slides,obj).children().each(function(){
			pt = pt+1;
			if (pt<i+1) {
				params[o.vertical ? 'top' : 'left'] = (-w*pt)+pd-(w*os);
				$(o.slides,obj).children(':eq('+(s-pt)+')').css(params);
			}
			if (pt===i+2) {
				pt = 0;
				return false;
			}
		});
		
		$('.next',obj).click(function(){
			if(u===false) {
				animate('next',true);
				if(o.autoStart){clearInterval(sliderIntervalID);}
			}
			return false;
		});
		
		$('.previous',obj).click(function(){
			if(u===false) {	
				animate('prev',true);
				if(o.autoStart){clearInterval(sliderIntervalID);}
			} return false;
		});
		
		$(o.pagination+' li a',obj).click(function(){
			if ($(this).parent().hasClass('active')) {return false;}
			else {
				t = $(this).attr('rel');
				$(o.pagination+' li a',obj).parent().siblings().removeClass('active');
				$(this).parent().addClass('active');
				animate('fade',t);
				if(o.autoStart){clearInterval(sliderIntervalID);}
			} return false;
		});
		
		if (o.autoStart) {
			sliderIntervalID = setInterval(function(){
				if(u===false) {animate('next',true);}
			}, o.autoStart);
		}
		
		function current(t) {
			if(t===c+1){t=1;}
			if(t===0){t=c;}
			$(o.pagination+' li a',obj).parent().siblings().removeClass('active');
			$(o.pagination+' li a[rel="' + (t) + '"]',obj).parent().addClass('active');
		}
		
		function animate(dir,clicked){	
			u = true;	
			switch(dir){
				case 'next':
					t = t+1;
					m = (-(t*w-w)*i);
					current(t);		
					params[o.vertical ? 'top' : 'left'] = m;				
					$(o.slides,obj).animate(params, o.slidespeed,function(){
						if (t===c+1) {
							t = 1;
							params[o.vertical ? 'top' : 'left'] = 0;
							$(o.slides,obj).css(params,function(){
								$(o.slides,obj).animate(params);
							});						
							$(o.slides,obj).children().each(function(){	
								if (pt<i) {
									params[o.vertical ? 'top' : 'left'] = (w*pt)+pd;
									$(o.slides,obj).children(':eq('+pt+')').css(params);
									params[o.vertical ? 'top' : 'left'] = -(w*(pt+os+1)-pd);
									$(o.slides,obj).children(':eq('+(s-(pt+1))+')').css(params);
								} else {
									pt = 0; 
									return false;
								}
								pt = pt+1;
							});	
						}
						if (t===c) {
							$(o.slides,obj).children().each(function(){	
								if (pt<i) {
									params[o.vertical ? 'top' : 'left'] = w*(s+pt+os)+pd;
									$(o.slides,obj).children(':eq('+(pt)+')').css(params);
								} else {
									pt = 0;
									return false;
								}
								pt = pt+1;
							});
						}
						if (t===2) {
							$(o.slides,obj).children().each(function(){
								pt = pt+1;
								if (pt<i+1) {									
									params[o.vertical ? 'top' : 'left'] = ((w*s)+pd)-(w*pt);
									$(o.slides,obj).children(':eq('+(s-pt)+')').css(params);
								} else {
									pt = 0;
									return false;
								}
							});
						}
						u = false;
					});					
					break; 
				case 'prev':
					t = t-1;
					m = (-(t*w-w)*i);
					current(t);
					params[o.vertical ? 'top' : 'left'] = m;
					$(o.slides,obj).animate(params, o.slidespeed,function(){
						if (t===0) {
							t = c;
							params[o.vertical ? 'top' : 'left'] = -w*(s-i)-(w*os);
							$(o.slides,obj).css(params);
							$(o.slides,obj).children().each(function(){	
								if (pt<i) {
									params[o.vertical ? 'top' : 'left'] = w*(s+pt+os)+pd;
									$(o.slides,obj).children(':eq('+pt+')').css(params);									
									params[o.vertical ? 'top' : 'left'] = (s*w)+pd-(pt*w)-w;
									$(o.slides,obj).children(':eq('+((s-1)-pt)+')').css(params);
								} else {
									pt = 0; 
									return false;
								}
								pt = pt+1;
							});
						}
						if (t===2) {
							$(o.slides,obj).children().each(function(){	
								if (pt<i) {
									params[o.vertical ? 'top' : 'left'] = (w*pt)+pd;
									$(o.slides,obj).children(':eq('+pt+')').css(params);
								} else {
									pt = 0; 
									return false;
								}
								pt = pt+1;
							});
						}
						if (t===1) {
							$(o.slides,obj).children().each(function(){	
								if (pt<i) {
									params[o.vertical ? 'top' : 'left'] = -(w*pt)-w+pd-(w*os);
									$(o.slides,obj).children(':eq('+((s-1)-pt)+')').css(params);
								} else {
									pt = 0; 
									return false;
								}
								pt = pt+1;
							});
						}

						u = false;
					});
					break;
				case 'fade':
					t = [t]*1;
					m = (-(t*w-w)*i);
					current(t);
					$(o.slides,obj).children().fadeOut(o.fadespeed, function(){
						params[o.vertical ? 'top' : 'left'] = m;
						$(o.slides,obj).css(params);
						$(o.slides,obj).children().each(function(){	
							if (pt<i) {
								params[o.vertical ? 'top' : 'left'] = (pt*w)+pd;
								$(o.slides,obj).children(':eq('+pt+')').css(params);
								params[o.vertical ? 'top' : 'left'] = w*(s-pt)-w+pd;
								$(o.slides,obj).children(':eq('+((s-1)-pt)+')').css(params);
							} else {
								pt = 0; 
								return false;
							}
							pt = pt+1;
						});
						
						if(t===c){						
							$(o.slides,obj).children().each(function(){	
								if (pt<i) {
									params[o.vertical ? 'top' : 'left'] = w*(s+pt+os)+pd;
									$(o.slides,obj).children(':eq('+(pt)+')').css(params);
								} else {
									pt = 0;
									return false;
								}
								pt = pt+1;
							});
						}
						if(t===1){
							$(o.slides,obj).children().each(function(){
								pt = pt+1;
								if (pt<i+1) {
									params[o.vertical ? 'top' : 'left'] = -(w*pt)+pd-(w*os);
									$(o.slides,obj).children(':eq('+(s-pt)+')').css(params);
								} else {
									pt = 0;
									return false;
								}
							});
						}
						$(o.slides,obj).children().fadeIn(o.fadespeed);
						u = false;
					});
					break; 
				default:
					break;
				}					
			}
		});
	};
})(jQuery);