layui.define(['element', 'common'], function (exports) {
    var mod_name = 'tab',
		$ = layui.jquery,
		element = layui.element(),
		commom = layui.common,
		globalTabIdIndex = 0,
		Tab = function () {
		    this.config = {
		        elem: undefined,
		        closed: true //是否包含删除按钮
		    };
		};
    var ELEM = {};
    /**
	 * 参数设置
	 * @param {Object} options
	 */
    Tab.prototype.set = function (options) {
        var that = this;
        $.extend(true, that.config, options);
        return that;
    };
    /**
	 * 初始化
	 */
    Tab.prototype.init = function () {
        var that = this;
        var _config = that.config;
        if (typeof (_config.elem) !== 'string' && typeof (_config.elem) !== 'object') {
            common.throwError('Tab error: elem参数未定义或设置出错，具体设置格式请参考文档API.');
        }
        var $container;
        if (typeof (_config.elem) === 'string') {
            $container = $('' + _config.elem + '');
        }
        if (typeof (_config.elem) === 'object') {
            $container = _config.elem;
        }
        if ($container.length === 0) {
            common.throwError('Tab error:找不到elem参数配置的容器，请检查.');
        }
        var filter = $container.attr('lay-filter');
        if (filter === undefined || filter === '') {
            common.throwError('Tab error:请为elem容器设置一个lay-filter过滤器');
        }
        _config.elem = $container;
        ELEM.titleBox = $container.children('ul.layui-tab-title');
        ELEM.contentBox = $container.children('div.layui-tab-content');
        ELEM.tabFilter = filter;
        return that;
    };
    /**
	 * 查询tab是否存在，如果存在则返回索引值，不存在返回-1
	 * @param {String} 标题
	 */
    Tab.prototype.exists = function (title) {
        var that = ELEM.titleBox === undefined ? this.init() : this,
			tabIndex = -1;
        ELEM.titleBox.find('li').each(function (i, e) {
            var $cite = $(this).children('cite');
            if ($cite.text() === title) {
                tabIndex = i;
            };
        });
        return tabIndex;
    };
    /**
	 * 添加选择卡，如果选择卡存在则获取焦点
	 * @param {Object} data
	 */
    Tab.prototype.tabAdd = function (data) {
        var that = this;
        var tabIndex = that.exists(data.title);
        if (tabIndex === -1) {
            globalTabIdIndex++;
            var content = '<iframe src="' + data.href + '" data-id="' + globalTabIdIndex + '"></iframe>';
            var title = '';
            if (data.icon !== undefined) {
                if (data.icon.indexOf('fa-') !== -1) {
                    title += '<i class="' + data.icon + '" aria-hidden="true"></i>';
                } else {
                    title += '<i class="layui-icon">' + data.icon + '</i>';
                }
            }
            title += '<cite>' + data.title + '</cite>';
            if (that.config.closed) {
                title += '<i class="layui-icon layui-unselect layui-tab-close" data-id="' + globalTabIdIndex + '">&#x1006;</i>';
            }
            //添加tab
            element.tabAdd(ELEM.tabFilter, {
                title: title,
                content: content
            });
            //iframe 自适应
            ELEM.contentBox.find('iframe[data-id=' + globalTabIdIndex + ']').each(function () {
                $(this).height(ELEM.contentBox.height());
            });
            if (that.config.closed) {
                //监听关闭事件
                ELEM.titleBox.find('li').children('i.layui-tab-close[data-id=' + globalTabIdIndex + ']').on('click', function () {
                    element.tabDelete(ELEM.tabFilter, $(this).parent('li').index()).init();
                });
            };
            //切换到当前打开的选项卡
            element.tabChange(ELEM.tabFilter, ELEM.titleBox.find('li').length - 1);
        } else {
            element.tabChange(ELEM.tabFilter, tabIndex);
        }
    };
    Tab.prototype.on = function (events, callback) {

    }

    var tab = new Tab();
    exports(mod_name, function (options) {
        return tab.set(options);
    });
});