/*
bxCarousel v1.0
Plugin developed by: Steven Wanderski
http://bxcarousel.com
http://stevenwanderski.com

Released under the GPL license:
http://www.gnu.org/licenses/gpl.html
*/

(function($){

	$.fn.bxCarousel = function(options){

		var defaults = {
			move: 4,
			display_num: 4,
			speed: 500,
			margin:0,
			auto: false,
			auto_interval: 2000,
			auto_dir: 'next',
			auto_hover: false,
			next_text: 'next',
			next_image: '',
			prev_text: 'prev',
			prev_image: '',
			controls: true
		};

		var options = $.extend(defaults, options);

		return this.each(function() {
			var $this = $(this);                
			var li = $this.find('li');
			var first = 0;
			var fe = 0;
			var last = options.display_num-1;
			var le = options.display_num-1;
			var is_working = false;
			var j = '';
			var clicked = false;		

			li.css({'float':'left','listStyle':'none', 'marginRight':options.margin});
			var ow = li.outerWidth(true);
			wrap_width = (ow*options.display_num) - options.margin;                
			var seg = ow*options.move;
			$this.wrap('<div class="bx_container"></div>').width(999999);
			if(options.controls){
				if(options.next_image != '' || options.prev_image != ''){var controls = '<a href="" class="prev"><img src="'+options.prev_image+'"/></a><a href="" class="next"><img src="'+options.next_image+'"/></a>';}
				else{var controls = '<a href="" class="prev">'+options.prev_text+'</a><a href="" class="next">'+options.next_text+'</a>';}	
			}			
			$this.parent('.bx_container').wrap('<div class="bx_wrap"></div>').css({'position':'relative', 'width':wrap_width,'overflow':'hidden'}).before(controls);
			var w = li.slice(0, options.display_num).clone();
			var last_appended = (options.display_num+options.move)-1;
			$this.empty().append(w);				
			get_p();				
			get_a();
			$this.css({'position':'relative', 'left':-(seg)});
						
			$this.parent().siblings('.next').click(function(){
				slide_next();
				clearInterval(j);
				clicked = true;
				return false;
			});				
			$this.parent().siblings('.prev').click(function(){
				slide_prev();
				clearInterval(j);
				clicked = true;
				return false;
			});
			if(options.auto){
				start_slide();
				if(options.auto_hover && clicked != true){
					$this.find('li').live('mouseenter', function(){
						if(!clicked){clearInterval(j);}						
					});
					$this.find('li').live('mouseleave', function(){
						if(!clicked){start_slide();}
					});
					
				}
			}
			
			function start_slide(){
				if(options.auto_dir == 'next'){
					j = setInterval(function(){slide_next()}, options.auto_interval);
				}else{
					j = setInterval(function(){slide_prev()}, options.auto_interval);
				}
			}

			function slide_next(){
				if(!is_working){
					is_working = true;
					set_pos('next');
					$this.animate({left:'-='+seg}, options.speed, function(){
						$this.find('li').slice(0, options.move).remove();
						$this.css('left',-(seg));
						get_a();
						is_working = false;			
					});
				}
			}
			
			function slide_prev(){
				if(!is_working){
					is_working = true;
					set_pos('prev');
					$this.animate({left:'+='+seg}, options.speed, function(){
						$this.find('li').slice(-options.move).remove();
						$this.css('left',-(seg));
						get_p();
						is_working = false;                 
					});
				}
			}

			function get_a(){
				var str = new Array();
				var lix = li.clone();
				le = last;
				for(i=0;i<options.move;i++){
					le++
					if(lix[le] != undefined){
						str[i] = $(lix[le]);    
					}else{
						le = 0;
						str[i] = $(lix[le]);
					}                                                                       
				}					                 
				$.each(str, function(index){
					$this.append(str[index][0]);
				});
			}
							
			function get_p(){
				var str = new Array();
				var lix = li.clone();
				fe = first;
				for(i=0;i<options.move;i++){
					fe--
					if(lix[fe] != undefined){
						str[i] = $(lix[fe]);    
					}else{
						fe = li.length-1;
						str[i] = $(lix[fe]);
					}                                                                       
				}					        
				$.each(str, function(index){
					$this.prepend(str[index][0]);
				}); 
			}
							
			function set_pos(dir){
				if (dir == 'next') {
					first += options.move;
					if (first >= li.length) {
						first = first % li.length;
					}
					last += options.move;
					if (last >= li.length){
						last = last % li.length;
					}
				}else if (dir == 'prev'){
					first -= options.move;
					if (first < 0){
						first = li.length + first;
					}
					last -= options.move;
					if (last < 0){
						last = li.length + last;
					}
				}
			}				
		});			
	}    
})(jQuery);