
BUI.use(['bui/menu','bui/tab'],function(Menu,Tab) {
  //定义全局命名空间
  var PageUtil = BUI.app('PageUtil');

  var CLS_SELECTE = 'dl-selected',//选中的模块样式
      CLS_HIDDEN = 'ks-hidden',//隐藏的模块样式
      CLS_LAST = 'dl-last',//最后一个元素
      CLS_HOVER = 'dl-hover',
      CLS_ITEM = 'nav-item',
      CLS_LEFT_SLIB = 'dl-second-slib',
      CLS_TAB_ITEM = 'dl-tab-item',
      CLS_CALLAPSE = 'dl-collapse',
      CLS_HIDE_CURRENT = 'dl-hide-current',
      ATTTR_INDEX ='data-index',
      WIDTH_ITERM = 145;

  function setTopManager(mainPageObj){
    window.topManager = mainPageObj;
  }

  function addSearch(href,search){
    if(href.indexOf('?') !== -1){
      return href + '&' + search;
    }else{
      return href + '?' + search;
    }
  }
  //创建菜单和Tab，并绑定关联,是否收缩，是否有首页
  function tabNav(moduleId,tabConfig,menuConfig,collapsed,homePage){
    
    var _self =this,
      menu = new Menu.SideMenu(menuConfig),
      tab = new Tab.NavTab(tabConfig),
      menuContainerEl = $(menuConfig.render),
      slibEl = menuContainerEl.next('.' + CLS_LEFT_SLIB + '-con'),
      navContainerEl = menuContainerEl.parents('.'+CLS_TAB_ITEM);

    if(slibEl){
      slibEl.on('click',function(){
        navContainerEl.toggleClass(CLS_CALLAPSE);
      });
      slibEl.parent().height(tabConfig.height);
    }
    if(collapsed){
        navContainerEl.addClass(CLS_CALLAPSE);
    }

    //点击菜单，切换Tab，并刷新
    menu.on('menuclick',function(ev){
      var item = ev.item;
      if(item){
        _self.tab.addTab({id: item.get('id'), title: item.get('text'), href: item.get('href'),closeable : item.get('closeable')},true);
      }
      
    });

    //选中的菜单发生改变后，更新链接上的页面编号
    menu.on('itemselected',function(ev){   
      var item = ev.item; 
      if(item){
        setNavPosition(moduleId,item.get('id'));
      }    
      
    });

    //切换Tab激活菜单
    tab.on('activeChange',function(ev){
      var item = ev.item;
      if(item){
        _self.menu.setSelectedByField(item.get('id'));
      }else{
        _self.menu.clearSelection();
      }
      
    });

    _self.tab = tab;
    _self.menu = menu;
    _self.homePage = homePage;
    tab.render();
    menu.render();
    
  }

  //更改地址栏连接
  function setNavPosition(moduleId,pageId){
    pageId = pageId||'';

    var str = '#'+moduleId;
      
    if(pageId){
      str += '/'+pageId;
    }
    location.hash =str;
  }

  function getNavPositionSetting(){
    var pos = location.hash,
      moduleIndex = 0,
      pageId ='',
      splitIndex = pos.indexOf('/'),
      search = null;
    if(!pos){
      return null;
    }
      
    if(splitIndex >= 0){
      moduleIndex = pos.substring(1,splitIndex);
      pageId = pos.substring(splitIndex + 1);
      search = getParam(pageId);
      if(search){
        pageId = pageId.replace('?'+search,'');
      }
    }else{
      moduleIndex=pos.substring(1);
    }

    return {moduleId : moduleIndex,pageId : pageId,search : search};
  }

  function getParam(pageId){
    var index = pageId.indexOf('?');
    if(index >= 0){
      return pageId.substring(index + 1);
    }
    return null;
  }

  //清理权限系统带来的 “,“引起的Bug
  function initModuleConfig(mconfig){
    if(!$.isArray(mconfig)){
      return;
    }
    var emptyIndex = findEmptyIndex(mconfig);
    while(emptyIndex !== -1){
      mconfig.splice(emptyIndex,1);
      emptyIndex = findEmptyIndex(mconfig);
    }
    return mconfig;
  }

  //查找为空的纪录
  function findEmptyIndex(array){
      var result = -1;
      $.each(array,function(index,item){
        if(item === null || item === undefined){
          result = index;
          return false;
        }
      });
      return result;
    }

  //获取用户工作区域
  function getAutoHeight(){
    var height = BUI.viewportHeight(),
      subHeight = 70;
    return height - subHeight;  
  }

  function findItem(element){
    var el = $(element);
    if (el.hasClass(CLS_ITEM)) {
      return element;
    }
    return el.parent('.' + CLS_ITEM)[0];
  }

  var mainPage = function(config){
     initModuleConfig(config);
	   mainPage.superclass.constructor.call(this,config);
	   this._init();
     setTopManager(this);
  };

  mainPage.ATTRS = {
    /**
     * 当前模块的索引
     * @type {Number}
     */
    currentModelIndex:{

    },
    hideItmes : {
      value : []
    },
    //隐藏导航项列表
    hideList : {

    },
    /**
     * 模块集合
     * @type {Array}
     */
    modules : {
      value : []
    },
    /**
     * 模块的配置项
     * @type {Array}
     */
    modulesConfig: {

    },
    /**
     * 一级导航的容器
     * @type {jQuery}
     */
    navList : {
      valueFn : function () {
        return $('#J_Nav');// body...
      }
    },
    /**
     * 导航内容的容器
     * @type {jQuery}
     */
    navContent : {
      valueFn : function () {
        return $('#J_NavContent');
      }
    },
    /**
     * 导航项
     * @type {jQuery}
     */
    navItems : {
      valueFn : function () {
        return $('#J_Nav').children('.' + CLS_ITEM);// body...
      }
    },
    navTabs:{
      valueFn : function(){
        return this.get('navContent').children('.'+CLS_TAB_ITEM)
      }
    },
    /**
     * 页面的后缀
     * @type {Object}
     */
    urlSuffix : {
      value : '.html'
    }
  };

  BUI.extend(mainPage,BUI.Base);

  BUI.augment(mainPage,{
    //打开页面
    openPage : function(pageInfo){
      var _self = this,
        moduleId = pageInfo.moduleId || _self._getCurrentModuleId(),
        id = pageInfo.id,
        title = pageInfo.title || '新的标签页',
        href = pageInfo.href,
        isClose = pageInfo.isClose,
        closeable = pageInfo.closeable,
        reload = pageInfo.reload,
        search = pageInfo.search;

      var module = _self._getModule(moduleId);
      if(module){
        var tab = module.tab,
          menu = module.menu,
          menuItem = menu.getItem(id),
          curTabPage = tab.getActivedItem(),
          sourceId = curTabPage ? curTabPage.get('id') : null,
          moduleIndex = _self._getModuleIndex(moduleId);
        if(moduleId != _self._getCurrentModuleId()){
            _self._setModuleSelected(moduleIndex);
        }
        if(menuItem){
          _self._setPageSelected(moduleIndex,id,reload,search);
        }else{
          tab.addTab({id: id, title: title, href: href, sourceId: sourceId,closeable: closeable},reload);
        }
        
        if(isClose){
          curTabPage.close();
        }
      }
    },
    //关闭页面
    closePage:function(id,moduleId){
      this.operatePage(moduleId,id,'close');
    },
    //刷新
    reloadPage : function(id,moduleId){
      this.operatePage(moduleId,id,'reload');
    },
    //更改标题
    setPageTitle : function(title,id,moduleId){
      this.operatePage(moduleId,id,'setTitle',[title]);
    },
    //操作页面
    operatePage : function(moduleId,id,action,args){

      moduleId = moduleId || this._getCurrentModuleId();
      args = args || [];
      var _self = this,
        module = _self._getModule(moduleId);
      if(module){
         var tab = module.tab,
          item = id ? tab.getItemById(id) : tab.getActivedItem();
        if(item && item[action]){
          item[action].apply(item,args);
        }
      }
    },
    //创建模块
    _createModule:function(id){
      var _self = this,
        item= _self._getModuleConfig(id),
        modules = _self.get('modules');
      if(!item){
          return null;
      }
      var id =item.id,
      tabId = '#J_'+id+'Tab',
      treeId = '#J_'+id+'Tree';
      module = new tabNav(id,{render:tabId,height:getAutoHeight() - 5},{render:treeId,items:item.menu,height:getAutoHeight() - 5},item.collapsed,item.homePage);
      modules[id]= module;
      return module;
    },
    //隐藏列表
    _hideHideList :function(){
      this.get('hideList').hide();
    },
    _init : function(){
      var _self = this;
      _self._initDom();
      _self._initNavItems();
      _self._initEvent();
    },
    //进行自适应计算
    _initNavItems : function(){

      var _self = this,
        navItems = _self.get('navItems'),
        hideItmes = _self.get('hideItmes');
      //如果不存在导航项，不用进行自适应计算
      if(navItems.length === 0)
      {
        return;
      }
      
      $('<div class="nav-item-mask"></div>').appendTo($(navItems));

      var count =  navItems.length,
        clientWidth = BUI.viewportWidth(),//获取窗口宽度
        itemWidth = WIDTH_ITERM,
        totalWidth = itemWidth * count,
        showCount = 0;

      //如果导航项总宽度小于用户可视区域，不用进行自适应计算
      if(totalWidth <= clientWidth){
        return;
      }
      
      //初始化dataIndex
      $.each(navItems,function(index,item){
        $(item).attr(ATTTR_INDEX,index);
        $(item).removeClass(CLS_LAST);

      });

      showCount = parseInt(clientWidth / itemWidth);
      var lastShowItem = navItems[showCount - 1];
      _self._setLastItem(lastShowItem);

      hideItmes.push($(lastShowItem).clone()[0]);
      for(var i = showCount; i < count; i++){
        var itemEl = $(navItems[i]),
          cloneItme = null;
        
        cloneItme = itemEl.clone()[0];
        hideItmes.push(cloneItme);
        itemEl.addClass(CLS_HIDDEN);

      }

      _self._initHideList();
      
    },
    _initHideList : function(){
      var _self = this,
        hideList = _self.get('hideList'),
        hideItmes = _self.get('hideItmes');

      if(hideList){
        return;
      }
      
      var template = '<ul class="dl-hide-list ks-hidden"></ul>',
        hideListEl = $(template).appendTo('body');
      hideList = hideListEl;
      $.each(hideItmes,function(index,item){
        $(item).appendTo(hideList);
      });
      _self.set('hideList',hideList);
      _self._initHideListEvent();
    },
    _initHideListEvent:function(){
      var _self = this,
        hideList = _self.get('hideList');

      if(hideList == null){
        return;
      }
        
      hideList.on('mouseleave',function(){
        _self._hideHideList();
      });

      hideList.on('click',function(event){
        var item = findItem(event.target),
          el = null,
          dataIndex = 0;
        if(item){
          el = $(item);
          dataIndex = el.attr(ATTTR_INDEX);
          _self._setModuleSelected(dataIndex);
          _self._hideHideList();
        }
      });
    },
    _initContents : function () {
      var _self = this,
        modulesConfig = _self.get('modulesConfig'),
        navContent = _self.get('navContent');

      //清空模块容器
      navContent.children().remove();

      //初始化二级菜单一级Tab
      $.each(modulesConfig,function(index,module){
        var id = module.id,
          temp =['<li class="dl-tab-item ks-hidden"><div class="dl-second-nav"><div class="dl-second-tree" id="J_',id,'Tree"></div><div class="', CLS_LEFT_SLIB, '-con"><div class="', CLS_LEFT_SLIB, '"></div></div></div><div class="dl-inner-tab" id="J_',id,'Tab"></div></li>'].join('');
        new $(temp).appendTo(navContent);
      });
    },
    _initDom : function(){
      var _self = this;

      _self._initContents();
      _self._initLocation();

    },
    _initEvent : function(){
      var _self = this,
        navItems = _self.get('navItems');
      navItems.each(function(index,item){
        var item = $(item);
        item.on('click',function(){
          var sender =$(this);
          if(sender.hasClass(CLS_SELECTE)){
            return;
          }
          //sender.addClass(CLS_SELECTE);
          _self._setModuleSelected(index,sender);
        }).on('mouseenter',function(){

          $(this).addClass(CLS_HOVER);
        }).on('mouseleave',function(){
          $(this).removeClass(CLS_HOVER);
        });
      });
      _self._initNavListEvent();
    },
    _initNavListEvent : function(){
      var _self = this,
        hideList = _self.get('hideList'),
        navList = _self.get('navList');

      navList.on('mouseover',function(event){
        var item = findItem(event.target),
          el = $(item),
          offset = null;

        if(el && el.hasClass(CLS_LAST) && hideList){
          offset = el.offset();
          offset.top += 37;
                  
          offset.left += 2;
          _self._showHideList(offset);
        }
      }).on('mouseout',function(event){
        var toElement = event.toElement;
        if(toElement && hideList && !$.contains(hideList[0],toElement) && toElement !== hideList[0]){
          _self._hideHideList();
        }
        
      });
    },
    //初始化选中的模块和页面
    _initLocation :function (){

      //从链接中获取用户定位到的模块，便于刷新和转到指定模块使用
      var _self = this,
        defaultSetting = getNavPositionSetting();
      if(defaultSetting){
        var pageId = defaultSetting.pageId,   //页面编号
          search = defaultSetting.search,
          index = _self._getModuleIndex(defaultSetting.moduleId);   //附加参数

        _self._setModuleSelected(index);
        _self._setPageSelected(index,pageId,true,search);
      }else{
        var currentModelIndex = _self.get('currentModelIndex'),
          moduleId = _self._getModuleId(currentModelIndex);
        if(currentModelIndex == null){
          _self._setModuleSelected(0);
        }else{
          setNavPosition(moduleId);
        }
      }
    },
    //获取模块,如果未初始化则初始化模块
    _getModule : function(id){
      var _self = this,
        module = _self.get('modules')[id];
      if(!module){
          module = _self._createModule(id);
      }
      return module;
    },
    _getModuleIndex : function(id){
      var _self = this,
        result = 0;

      $.each(_self.get('modulesConfig'),function(index,conf){
        if(conf.id === id){
          result = index;
          return false;
        }
      });
      return result;
    },
    _getModuleConfig : function(id){
      var _self = this,
         result =null;
      $.each(_self.get('modulesConfig'),function(index,conf){
        if(conf.id === id){
          result = conf;
          return false;
        }
      });
      return result;
    },
    //获取模块编号
    _getModuleId : function(index){

      var modulesConfig = this.get('modulesConfig');
      if(modulesConfig[index]){
        return modulesConfig[index].id;
      }else{
        return index;
      }
    },
    _getCurrentPageId : function(){
      var _self = this,
        moduleId = _self._getCurrentModuleId(),
        module = _self._getModule(moduleId),
        pageId ='';
      if(module){
        var item = module.menu.getSelected();
        if(item){
          pageId = item.get('id');
        }
      }
      return pageId;
    },
    _getCurrentModuleId : function(){
      return this._getModuleId(this.get('currentModelIndex'));
    },
    //模块是否已经初始化
    _isModuleInitial : function(id){
      return !!this.get('modules')[id];
    },
    //设置最后一个
    _setLastItem : function(item){
      var _self = this,
        lastShowItem = _self.get('lastShowItem');

      if(lastShowItem === item){
        return;
      }
      
      var appendNode = null,
        lastShowItemEl = $(lastShowItem);
        itemEl = $(item);
      if(lastShowItem){
        appendNode = lastShowItemEl.find('.'+CLS_HIDE_CURRENT);
        lastShowItemEl.removeClass(CLS_LAST);
        lastShowItemEl.addClass(CLS_HIDDEN);
      }
      itemEl.addClass(CLS_LAST);
      itemEl.removeClass(CLS_HIDDEN);
      if(!appendNode){
        appendNode = $('<span class="icon icon-white  icon-caret-down '+CLS_HIDE_CURRENT+'">&nbsp;&nbsp;</span>');
      }
      appendNode.appendTo(itemEl.children('.nav-item-inner'));
      _self.set('lastShowItem',item)
    },
    //设置选中的模块
    _setModuleSelected : function(index,sender){
      var _self = this,
        navItems = _self.get('navItems'),
        navTabs = _self.get('navTabs'),
        currentModelIndex = _self.get('currentModelIndex');

      if(currentModelIndex !==index){
        var moduleId = _self._getModuleId(index),
          module = null,
          lastShowItem = _self.get('lastShowItem'),
          isCreated = true;//模块是否已经创建
                    
        if(!_self._isModuleInitial(moduleId)){
          isCreated = false;
        }

        module =  _self._getModule(moduleId);


        sender = sender ||$(_self.get('navItems')[index]); 
        //如果模块隐藏
        if(sender.hasClass(CLS_HIDDEN) && lastShowItem){
          _self._setLastItem(sender[0]);
          _self._setSelectHideItem(index);
        }/**/
        navItems.removeClass(CLS_SELECTE);
        sender.addClass(CLS_SELECTE);
        navTabs.addClass(CLS_HIDDEN);
        $(navTabs[index]).removeClass(CLS_HIDDEN);
      
        currentModelIndex = index;
        _self.set('currentModelIndex',currentModelIndex);
        curPageId = _self._getCurrentPageId();
        setNavPosition(moduleId,curPageId);
                
        if(!curPageId && module.homePage){
            _self._setPageSelected(index,module.homePage);
        }
      }
    },
    _setPageSelected:function(moduleIndex,pageId,isReload,search){
      var _self = this,
        moduleId = _self._getModuleId(moduleIndex)||moduleIndex,
        module = _self._getModule(moduleId);
      if(module && pageId){
        module.menu.setSelectedByField(pageId);
        var item = module.menu.getSelected(),
          tab = module.tab,
          href = '',
          suffixIndex = -1;
        if(item && item.get('id') === pageId){
          href = item.get('href');
          href = search ? (addSearch(href,search)) : href;
          module.tab.addTab({id: item.get('id'), title: item.get('text'),closeable : item.get('closeable'), href: href},!!isReload);

        }else if(pageId){

          var subDir = pageId.replace('-','/');
          if(subDir.indexOf('/') === -1){
            subDir = moduleId + '/' + subDir;
          }
          if((suffixIndex = pageId.indexOf('.')) === -1){
            subDir += _self.get('urlSuffix');
          }
          href = search ? (subDir + '?' + search) : subDir;
          tab.addTab({id:pageId,title:'',href:href},!!isReload);
        }
      }
    },
    _showHideList:function(offset){
      var _self = this,
        hideList = _self.get('hideList');

      hideList.css('left',offset.left);
      hideList.css('top',offset.top);
      hideList.show();
    },
    _setSelectHideItem : function (index) {
      var _self = this,
        hideList = _self.get('hideList'),
        hideItmes = _self.get('hideItmes'),
        currentItem = null,
        selectItem = null,
        selectEl = null,
        appendNode = null;
      BUI.each(hideItmes,function(item){
        var itemEl = $(item);
        if(itemEl.attr(ATTTR_INDEX) == index){
          selectItem = item;
        }

        if(itemEl.hasClass(CLS_LAST)){
          currentItem = item;
        }
      });

      if(currentItem !== selectItem){
        if(currentItem){
          appendNode = $(currentItem).find('.dl-hide-current');
          $(currentItem).removeClass(CLS_LAST);
        }
        $(selectItem).addClass(CLS_LAST);
        if(!appendNode){
          appendNode = new Node('<span class="dl-hide-current">&nbsp;&nbsp;</span>');
        }
        selectEl = $(selectItem);
        appendNode.appendTo(selectEl.children('.nav-item-inner'));
        selectEl.prependTo(hideList);
      }

    }
    
  });
  PageUtil.MainPage = mainPage;
});