/**
 * @name: yyslider
 * @overview: 左右滚动组件
 * @require: jquery.js
 * @author: yang(ws2042@163.com)
 */
 
(function($){

	$.fn.yyslider = function( option ){

		// 参数对象

		option = $.extend( {}, $.fn.yyslider.option, option );

		$.fn.yyslider.option = {
			a_sliderbox   : undefined,				//
			a_sliderlist  : undefined,				//
			a_slideritem  : undefined,				//
			a_slider_prev : undefined,				//
			a_slider_next : undefined,				//
			a_show_num    : 1,						//
			a_show_type   : "default",				// 
			a_show_dir	  : "left",					// 滚动方向
			a_steptime	  : 500,					// 滚动单步长动画时间
			a_margin	  : 0,						// margin
			a_scroll_num  : 1,						// 滚动数量
			a_funct       : undefined,				//
			a_classon	  : "on",
			a_statuscheck : function(){}			// 回调函数用于判断当前按钮状态
		};


		// 返回实例
		return this.each(function(){

		// 定义参数
			var slider  	= $(this),
				sliderbox   = slider.find(option.a_sliderbox),
				sliderlist  = slider.find(option.a_sliderlist),
				slideritem	= slider.find(option.a_slideritem),
				slider_prev = slider.find(option.a_slider_prev),
				slider_next = slider.find(option.a_slider_next),
				show_type   = option.a_show_type,
				funct 		= option.a_funct || function(){},
				imargin		= option.a_margin,
				show_num    = option.a_show_num,
				num 		= slideritem.length,
				snum  		= option.a_scroll_num,
				n			= 0,
				sdir        = option.a_show_dir,       	// 
				steptime	= option.a_steptime,       		// 
				stepwh 		= 0,							// 滚动单步长
				classon 	= option.a_classon || "on",
				statuscheck   = option.a_statuscheck
				;
			
			// x
			if(sdir=="left"){
			// init
				stepwh = slideritem.width()+imargin;
				sliderlist.width( (slideritem.width()+imargin)*num );

			// event
				slider_prev.unbind().bind("click",function(){
					if(n<=0 && !sliderlist.hasclass("running")){
						n=n+snum;
						if(n>=0){
							n=0;
							statuscheck("first");
						}else{
							statuscheck("running");
						};
						sliderlist.addclass("running").animate({"left":n*(slideritem.width()+imargin)+"px"},steptime,function(){
							sliderlist.removeclass("running");
						});
					}
				});

				slider_next.unbind().bind("click",function(){
					if(n > -(num-show_num) && !sliderlist.hasclass("running")){
						n=n-snum;
						if(n<=-(num-show_num)){
							n=-(num-show_num)
							statuscheck("last");
						}else{
							statuscheck("running");
						};
						sliderlist.addclass("running").animate({"left":n*(slideritem.width()+imargin)+"px"},steptime,function(){
							sliderlist.removeclass("running");
						});
					}
				});

				slideritem.each(function(i){

					$(this).unbind().bind("click",function(){
						slideritem.removeclass(classon);
						$(this).addclass(classon);

						funct(i);
					})

				});

				$(window).resize(function(){
					sliderlist.css({"left":n*(slideritem.width()+imargin)+"px"})
				})


			};

			// y 
			if(sdir=="top"){
				// init
				stepwh = slideritem.height()+imargin;
				sliderlist.height( (slideritem.height()+imargin)*num );
				
				// event
				slider_prev.unbind().bind("click",function(){
					if(n<=0 && !sliderlist.hasclass("running")){
						n=n+snum;
						if(n>=0){
							n=0;
							statuscheck("first");
						}else{
							statuscheck("running");
						};
						sliderlist.addclass("running").animate({"top":n*(slideritem.height()+imargin)+"px"},steptime,function(){
							sliderlist.removeclass("running");
						});
					}
				});

				slider_next.unbind().bind("click",function(){
					if(n > -(num-show_num) && !sliderlist.hasclass("running")){
						n=n-snum;
						if(n<=-(num-show_num)){
							n=-(num-show_num)
							statuscheck("last");
						}else{
							statuscheck("running");
						};
						sliderlist.addclass("running").animate({"top":n*(slideritem.height()+imargin)+"px"},steptime,function(){
							sliderlist.removeclass("running");
						});
					}
				});

				slideritem.each(function(i){

					$(this).unbind().bind("click",function(){
						slideritem.removeclass(classon);
						$(this).addclass(classon);

						funct(i);
					})

				});

				$(window).resize(function(){
					sliderlist.css({"top":n*(slideritem.height()+imargin)+"px"})
				})
			}


		});
	}

})(jquery);