var tabFilter,menu=[],liIndex,curNav,delMenu;
layui.define(["element","jquery"],function(exports){
	var element = layui.element(),
		$ = layui.jquery,
		layId,
		Tab = function(){
			this.tabConfig = {
				closed : true,  
				openTabNum : undefined,  //最大可打开窗口数量
				tabFilter : "bodyTab",  //添加窗口的filter
				url : undefined  //获取菜单json地址
			}
		};

	//获取二级菜单数据
	Tab.prototype.render = function() {
		var url = this.tabConfig.url;
		$.get(url,function(data){
			//显示左侧菜单
			if($(".navBar").html() == ''){
				var _this = this;
				$(".navBar").html(navBar(data)).height($(window).height()-245);
				element.init();  //初始化页面元素
				$(window).resize(function(){
					$(".navBar").height($(window).height()-245);
				})
			}
		})
	}

	//参数设置
	Tab.prototype.set = function(option) {
		var _this = this;
		$.extend(true, _this.tabConfig, option);
		return _this;
	};

	//通过title获取lay-id
	Tab.prototype.getLayId = function(title){
		$(".layui-tab-title.top_tab li").each(function(){
			if($(this).find("cite").text() == title){
				layId = $(this).attr("lay-id");
			}
		})
		return layId;
	}
	//通过title判断tab是否存在
	Tab.prototype.hasTab = function(title){
		var tabIndex = -1;
		$(".layui-tab-title.top_tab li").each(function(){
			if($(this).find("cite").text() == title){
				tabIndex = 1;
			}
		})
		return tabIndex;
	}

	//右侧内容tab操作
	var tabIdIndex = 0;
	Tab.prototype.tabAdd = function(_this){
		if(window.sessionStorage.getItem("menu")){
			menu = JSON.parse(window.sessionStorage.getItem("menu"));
		}
		var that = this;
		var closed = that.tabConfig.closed,
			openTabNum = that.tabConfig.openTabNum;
			tabFilter = that.tabConfig.tabFilter;
		if(_this.attr("target") == "_blank"){
			window.location.href = _this.attr("data-url");
		}else{
			var title = '';
			if(_this.find("i.iconfont,i.layui-icon").attr("data-icon") != undefined){
				if(_this.find("i.iconfont").attr("data-icon") != undefined){
					title += '<i class="iconfont '+_this.find("i.iconfont").attr("data-icon")+'"></i>';
				}else{
					title += '<i class="layui-icon">'+_this.find("i.layui-icon").attr("data-icon")+'</i>';
				}
			}
			else
			{
				title += '<i class="iconfont icon-menu"></i>';
			}
			//已打开的窗口中不存在
			if(that.hasTab(_this.find("cite").text()) == -1 && _this.siblings("dl.layui-nav-child").length == 0){
				if($(".layui-tab-title.top_tab li").length == openTabNum){
					layer.msg('只能同时打开'+openTabNum+'个选项卡哦。不然系统会卡的！');
					return;
				}
				tabIdIndex++;
				title += '<cite>'+_this.find("cite").text()+'</cite>';
				title += '<i class="layui-icon layui-unselect layui-tab-close" data-id="'+tabIdIndex+'">&#x1006;</i>';
				element.tabAdd(tabFilter, {
			        title : title,
			        content :"<iframe src='"+_this.attr("data-url")+"' data-id='"+tabIdIndex+"'></frame>",
			        id : new Date().getTime()
			    })
				//当前窗口内容
				var curmenu = {
					"icon" : _this.find("i.iconfont").attr("data-icon")!=undefined ? _this.find("i.iconfont").attr("data-icon") : _this.find("i.layui-icon").attr("data-icon"),
					"title" : _this.find("cite").text(),
					"href" : _this.attr("data-url"),
					"layId" : new Date().getTime()
				}
				menu.push(curmenu);
				window.sessionStorage.setItem("menu",JSON.stringify(menu)); //打开的窗口
				window.sessionStorage.setItem("curmenu",JSON.stringify(curmenu));  //当前的窗口
				element.tabChange(tabFilter, that.getLayId(_this.find("cite").text()));
				that.tabMove(); //顶部窗口是否可滚动
			}else{
				//当前窗口内容
				var curmenu = {
					"icon" : _this.find("i.iconfont").attr("data-icon")!=undefined ? _this.find("i.iconfont").attr("data-icon") : _this.find("i.layui-icon").attr("data-icon"),
					"title" : _this.find("cite").text(),
					"href" : _this.attr("data-url")
				}
				window.sessionStorage.setItem("curmenu",JSON.stringify(curmenu));  //当前的窗口
				element.tabChange(tabFilter, that.getLayId(_this.find("cite").text()));
				that.tabMove(); //顶部窗口是否可滚动
				that.fresh(that.getLayId(_this.find("cite").text()));
			}
		}
	}
	//重新点击
    Tab.prototype.fresh = function(index) {
        element.tabChange(tabFilter, index);
        var titleBox = $(".layui-tab-title"),
			othis = titleBox.find('>li[lay-id="' + index + '"]'),
            index = othis.parent().children('li').index(othis),
            parents = othis.parents('.layui-tab').eq(0),
            item = parents.children('.layui-tab-content').children('.layui-tab-item'),
            src = item.eq(index).find('iframe').attr("src");
        item.eq(index).find('iframe').attr("src", src);
    }
	
	//顶部窗口移动
	Tab.prototype.tabMove = function(){
		$(window).on("resize",function(){
			var topTabsBox = $("#top_tabs_box"),
				topTabsBoxWidth = $("#top_tabs_box").width(),
				topTabs = $("#top_tabs"),
				topTabsWidth = $("#top_tabs").width(),
				tabLi = topTabs.find("li.layui-this"),
				top_tabs = document.getElementById("top_tabs");;

			if(topTabsWidth > topTabsBoxWidth){
				if(tabLi.position().left > topTabsBoxWidth || tabLi.position().left+topTabsBoxWidth > topTabsWidth){
					topTabs.css("left",topTabsBoxWidth-topTabsWidth);
				}else{
					topTabs.css("left",-tabLi.position().left);
				}
				//拖动效果
				var flag = false;
				var cur = {
				    x:0,
				    y:0
				}
				var nx,dx,x ;
				function down(){
				    flag = true;
				    var touch ;
				    if(event.touches){
				        touch = event.touches[0];
				    }else {
				        touch = event;
				    }
				    cur.x = touch.clientX;
				    dx = top_tabs.offsetLeft;
				}
				function move(){
					var self=this;
					window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty();
				    if(flag){
				        var touch ;
				        if(event.touches){
				            touch = event.touches[0];
				        }else {
				            touch = event;
				        }
				        nx = touch.clientX - cur.x;
				        x = dx+nx;
				        if(x > 0){
				        	x = 0;
				        }else{
				        	 if(x < topTabsBoxWidth-topTabsWidth){
				        	 	x = topTabsBoxWidth-topTabsWidth;
				        	 }else{
				        	 	x = dx+nx;
				        	 }
				        }
				        top_tabs.style.left = x +"px";
				        //阻止页面的滑动默认事件
				        document.addEventListener("touchmove",function(){
				            event.preventDefault();
				        },false);
				    }
				}
				//鼠标释放时候的函数
				function end(){
				    flag = false;
				}
				//pc端拖动效果
				topTabs.on("mousedown",down);
				topTabs.on("mousemove",move);
				$(document).on("mouseup",end);
				//移动端拖动效果
				topTabs.on("touchstart",down);
				topTabs.on("touchmove",move);
				topTabs.on("touchend",end);
			}else{
				//移除pc端拖动效果
				topTabs.off("mousedown",down);
				topTabs.off("mousemove",move);
				topTabs.off("mouseup",end);
				//移除移动端拖动效果
				topTabs.off("touchstart",down);
				topTabs.off("touchmove",move);
				topTabs.off("touchend",end);
				topTabs.removeAttr("style");
				return false;
			}
		}).resize();
	}

	$("body").on("click",".top_tab li",function(){
		//切换后获取当前窗口的内容
		var curmenu = '';
		var menu = JSON.parse(window.sessionStorage.getItem("menu"));
		curmenu = menu[$(this).index()-1];
		if($(this).index() == 0){
			window.sessionStorage.setItem("curmenu",'');
		}else{
			window.sessionStorage.setItem("curmenu",JSON.stringify(curmenu));
			if(window.sessionStorage.getItem("curmenu") == "undefined"){
				//如果删除的不是当前选中的tab,则将curmenu设置成当前选中的tab
				if(curNav != JSON.stringify(delMenu)){
					window.sessionStorage.setItem("curmenu",curNav);
				}else{
					window.sessionStorage.setItem("curmenu",JSON.stringify(menu[liIndex-1]));
				}
			}
		}
		element.tabChange(tabFilter,$(this).attr("lay-id")).init();
		// new Tab().tabMove();
	})

	//删除tab
	$("body").on("click",".top_tab li i.layui-tab-close",function(){
		//删除tab后重置session中的menu和curmenu
		liIndex = $(this).parent("li").index();
		var menu = JSON.parse(window.sessionStorage.getItem("menu"));
		//获取被删除元素
		delMenu = menu[liIndex-1];
		var curmenu = window.sessionStorage.getItem("curmenu")=="undefined" ? undefined : window.sessionStorage.getItem("curmenu")=="" ? '' : JSON.parse(window.sessionStorage.getItem("curmenu"));
		if(JSON.stringify(curmenu) != JSON.stringify(menu[liIndex-1])){  //如果删除的不是当前选中的tab
			// window.sessionStorage.setItem("curmenu",JSON.stringify(curmenu));
			curNav = JSON.stringify(curmenu);
		}else{
			if($(this).parent("li").length > liIndex){
				window.sessionStorage.setItem("curmenu",curmenu);
				curNav = curmenu;
			}else{
				window.sessionStorage.setItem("curmenu",JSON.stringify(menu[liIndex-1]));
				curNav = JSON.stringify(menu[liIndex-1]);
			}
		}
		menu.splice((liIndex-1), 1);
		window.sessionStorage.setItem("menu",JSON.stringify(menu));
		element.tabDelete("bodyTab",$(this).parent("li").attr("lay-id")).init();
		new Tab().tabMove();
	})

	var bodyTab = new Tab();
	exports("bodyTab",function(option){
		return bodyTab.set(option);
	});
})