/*  
	评论及登录插件
	author:liuyue
	date:2015-01-07
*/
var $=require("jquery");
require('./lazyloadImage');

(function(global, undefined) {

	var Slider = function(element, options) {
		this.options = options;
		this.$element = $(element);
		this.$lis = this.$element.children();
		this.len = this.$lis.length;
   		this.timer = null;
   		this.width = this.$lis.width();
   		this.index = 0;
   		this.ctrlIndex = 0;
   		this.ctrl = this.options.pageCtrl;
   		this.ctrlEle = this.options.pageCtrl.children();
   		this.ctrlLen = this.ctrlEle.length;
   		this.ctrlWidth = this.ctrlEle.width() + parseInt(this.ctrlEle.eq(1).css("marginLeft"));
   		this.init();
   		this.ctrlMaxLeft = this.ctrl.width()-this.ctrl.parent().width()-parseInt(this.ctrlEle.eq(1).css("marginLeft"));
   		this.excessWidth = this.ctrlMaxLeft - this.ctrlWidth*(this.ctrlLen -this.options.ctrlShowNum);
	};


	Slider.DEFAULTS = {
		pageCtrl:'',
		ctrlShowNum:6,
		prevBtn:$(".detail-slide-ctrl-prev"),
		nextBtn:$(".detail-slide-ctrl-next")
	};


	Slider.prototype = {
		init:function(){
			this.setWidth();
			if(this.options.autoPlay){
				this.play();
			}
			this.cloneDom();
			this.bindEvent();
			this.addIndex();
			if(this.ctrlLen<=this.options.ctrlShowNum){
				this.options.prevBtn.hide();
				this.options.nextBtn.hide();
			}
		},

		setWidth:function(){
			this.$element.width(this.len*this.width);
			this.options.pageCtrl.width(this.ctrlWidth*this.ctrlLen);
			this.ctrlMaxLeft = this.ctrl.width()-this.ctrl.parent().width()-parseInt(this.ctrlEle.eq(1).css("marginLeft"));
			this.excessWidth = this.ctrlMaxLeft - this.ctrlWidth*(this.ctrlLen -this.options.ctrlShowNum);
		},

		cloneDom:function(){
			if(this.$element.children().length > this.len) return;
		},

		addIndex:function(){
			this.options.pageCtrl.children().each(function(i){
				$(this).attr("index",i);
			})
		},

		bindEvent:function(){
			var _this =this;
			this.options.pageCtrl.children().on("click",function(){
				if (_this.$element.is(':animated') || $(this).attr('class')=='current') {
                     return;
                 }
                 var myIndex = parseInt($(this).attr("index"));
                 var offset = -_this.width * (myIndex - _this.index);
                 _this.animate(offset);
                 clearTimeout(_this.timer);
                 _this.index = myIndex;
                if(_this.options.autoPlay){
					_this.play();
				}
                 _this.showButton();

                 var left = Math.abs(parseInt($(".detail-slide-ctrl-tabs").css("left")));
                 if($(this).index() == _this.options.ctrlShowNum-1+parseInt(left/_this.ctrlWidth) && left< _this.ctrlMaxLeft){
                 	_this.options.nextBtn.trigger("click.next");
                 }else if($(this).index() == parseInt(left/_this.ctrlWidth) && left>0){
                 	_this.options.prevBtn.trigger("click.prev");
                 }

			});
			this.options.prevBtn.on("click.prev",function(){
				if (_this.options.pageCtrl.is(':animated')) {
                     return;
                 }
				_this.prev();
			});
			this.options.nextBtn.on("click.next",function(){
				if (_this.options.pageCtrl.is(':animated')) {
                     return;
                 }
				_this.next();
			});
		},

		prev:function(){
			var excessWidth = this.excessWidth;
			var maxCtrlIndex = this.ctrlLen -this.options.ctrlShowNum;
			this.ctrlIndex--;

			if(this.ctrlIndex < 0){
            	this.ctrlIndex = maxCtrlIndex;
            }
			if(this.ctrlIndex === 0){
				this.options.pageCtrl.stop().animate({"left":0});
			}else{
				this.options.pageCtrl.stop().animate({"left":-this.ctrlWidth*this.ctrlIndex-excessWidth});
			}
		},

		next:function(){
			var maxCtrlIndex = this.ctrlLen -this.options.ctrlShowNum;

            if(this.ctrlIndex < maxCtrlIndex){
            	this.ctrlIndex++;
            }else{
            	this.ctrlIndex=0;
            }
            if(this.ctrlIndex == maxCtrlIndex && this.ctrlMaxLeft>0){
            	this.options.pageCtrl.stop().animate({"left":-this.ctrlMaxLeft});
            }else{
            	this.options.pageCtrl.stop().animate({"left":-this.ctrlWidth*this.ctrlIndex});
            }
		},

		showButton: function() {
            this.options.pageCtrl.children().eq(this.index).addClass('current').siblings().removeClass('current');
        },

		animate:function(offset){
			//var left = parseInt(this.$element.css('left')) + offset;
			var _this = this;
            if (offset>0) {
                offset = '+=' + offset;
            }
            else {
                offset = '-=' + Math.abs(offset);
            }
            this.$element.stop().animate({'left': offset}, 300);
             _this.$element.find(".lazy").lazyload();
		},

		//屏幕改变大小时重新计算
		resize:function(){
			this.width = this.$lis.width();
			this.ctrlWidth = this.ctrlEle.width() + parseInt(this.ctrlEle.eq(1).css("marginLeft"));
			this.setWidth();
			this.$element.css({'left': -this.index*this.width});
			if(this.ctrlIndex === 0) return;
			this.options.pageCtrl.css({"left":-this.ctrlWidth*this.ctrlIndex-this.excessWidth});
			
		}
	};


	function Plugin(option, _relatedTarget) {
		return this.each(function() {
			var $this = $(this);
			var data = $this.data('yoho.Slider');
			var options = $.extend({}, Slider.DEFAULTS, $this.data(), typeof option == 'object' && option);
			// 如果没有初始化，则初始化该对象，并且把该对象绑定到此元素的yoho.PicSilder属性下。
			if (!data) $this.data('yoho.Slider', (data = new Slider(this, options)));

			// 如果传递的options是一个字符串，则表示调用改对象的原型方法。
			if (typeof option == 'string') data[option](_relatedTarget);
		});
	}

	$.fn.slider             = Plugin;
  	$.fn.slider.Constructor = Slider;

})(this);