//保存页面id的field
var pageIdField = "data-pageId";

function getPageId(element) {
    if (element instanceof jQuery) {
        return element.attr(pageIdField);
    } else {
        return $(element).attr(pageIdField);
    }
}

function findTabTitle(pageId) {
    var $ele = null;
    $(".page-tabs-content").find("a.menu_tab").each(function () {
        var $a = $(this);
        if ($a.attr(pageIdField) == pageId) {
            $ele = $a;
            return false;//退出循环
        }
    });
    return $ele;
}

function findTabPanel(pageId) {
    var $ele = null;
    $("#tab-content").find("div.tab-pane").each(function () {
        var $div = $(this);
        if ($div.attr(pageIdField) == pageId) {
            $ele = $div;
            return false;//退出循环
        }
    });
    return $ele;
}

function findIframeById(pageId) {
    return findTabPanel(pageId).children("iframe");
}

function getActivePageId() {
    var $a = $('.page-tabs-content').find('.active');
    return getPageId($a);
}

function canRemoveTab(pageId) {
    return findTabTitle(pageId).find('.fa-remove').size() > 0;
}

//添加tab
var addTabs = function (options) {
    var defaultTabOptions = {
        id: Math.random() * 200,
        urlType: "relative",
        title: "新页面"
    };

    options = $.extend(true, defaultTabOptions, options);

    if (options.urlType === "relative") {
        // var url = window.location.protocol + '//' + window.location.host + "/";
        var basePath = window.location.pathname + "/../";
        options.url = basePath + options.url;
    }

    var pageId = options.id;

    //判断这个id的tab是否已经存在,不存在就新建一个
    if (findTabPanel(pageId) === null) {

        //创建新TAB的title
        // title = '<a  id="tab_' + pageId + '"  data-id="' + pageId + '"  class="menu_tab" >';

        var $title = $('<a href="javascript:void(0);"></a>').attr(pageIdField, pageId).addClass("menu_tab");

        var $text = $("<span class='page_tab_title'></span>").text(options.title).appendTo($title);
        // title += '<span class="page_tab_title">' + options.title + '</span>';

        //是否允许关闭
        if (options.close) {
            var $i = $("<i class='fa fa-remove page_tab_close' style='cursor: pointer' onclick='closeTab(this);'></i>").attr(pageIdField, pageId).appendTo($title);
            // title += ' <i class="fa fa-remove page_tab_close" style="cursor: pointer;" data-id="' + pageId + '" onclick="closeTab(this)"></i>';
        }

        //加入TABS
        $(".page-tabs-content").append($title);


        var $tabPanel = $('<div role="tabpanel" class="tab-pane"></div>').attr(pageIdField, pageId);

        if (options.content) {
            //是否指定TAB内容
            $tabPanel.append(options.content);
        } else {
            //没有内容，使用IFRAME打开链接

            App.blockUI({
                target: '#tab-content',
                boxed: true,
                message: '加载中......'//,
                // animate: true
            });

            var $iframe = $("<iframe></iframe>").attr("src", options.url).css("width", "100%").attr("frameborder", "no").attr("id", "iframe_" + pageId).addClass("tab_iframe").attr(pageIdField, pageId);
            //frameborder="no" border="0" marginwidth="0" marginheight="0" scrolling="yes"  allowtransparency="yes"

            //iframe 加载完成事件
            $iframe.load(function () {
                App.unblockUI('#tab-content');//解锁界面
                App.fixIframeCotent();//修正高度
            });

            $tabPanel.append($iframe);

        }

        // $tab = $(content);
        $("#tab-content").append($tabPanel);

        //iframe 加载完成事件
        /*$tab.find("iframe").load(function () {
         App.fixIframeCotent();
         });*/
    }

    activeTabByPageId(pageId);

};

//关闭tab
var closeTab = function (item) {
    //item可以是a标签,也可以是i标签
    //它们都有data-id属性,获取完成之后就没事了
    var pageId = getPageId(item);
    closeTabByPageId(pageId);
};

function closeTabByPageId(pageId) {
    var $title = findTabTitle(pageId);//有tab的标题
    var $tabPanel = findTabPanel(pageId);//装有iframe

    if ($title.hasClass("active")) {
        //要关闭的tab处于活动状态
        //要把active class传递给其它tab

        //优先传递给后面的tab,没有的话就传递给前一个
        var $nextTitle = $title.next();
        var activePageId;
        if ($nextTitle.size() > 0) {
            activePageId = getPageId($nextTitle);
        } else {
            activePageId = getPageId($title.prev());
        }

        setTimeout(function () {
            //某种bug，需要延迟执行
            activeTabByPageId(activePageId);
        }, 100);

    } else {
        //要关闭的tab不处于活动状态
        //直接移除就可以了,不用传active class

    }

    $title.remove();
    $tabPanel.remove();
    // scrollToTab($('.menu_tab.active')[0]);

}

function closeTabOnly(pageId) {
    var $title = findTabTitle(pageId);//有tab的标题
    var $tabPanel = findTabPanel(pageId);//装有iframe
    $title.remove();
    $tabPanel.remove();
}

var closeCurrentTab = function () {
    var pageId = getActivePageId();
    if (canRemoveTab(pageId)) {
        closeTabByPageId(pageId);
    }
};

function refreshTabById(pageId) {
    var $iframe = findIframeById(pageId);
    var url = $iframe.attr('src');

    if (url.indexOf(top.document.domain) < 0) {
        $iframe.attr("src", url);// 跨域状况下，重新设置url
    } else {
        $iframe[0].contentWindow.location.reload(true);//带参数刷新
    }

    App.blockUI({
        target: '#tab-content',
        boxed: true,
        message: '加载中......'//,
        // animate: true
    });
}

var refreshTab = function () {
    //刷新当前tab
    var pageId = getActivePageId();
    refreshTabById(pageId);
};

function getTabUrlById(pageId) {
    var $iframe = findIframeById(pageId);
    return $iframe[0].contentWindow.location.href;
}

function getTabUrl(element) {
    var pageId = getPageId(element);
    getTabUrlById(pageId);
}


/**
 * 编辑tab的标题
 * @param pageId
 * @param title
 */
function editTabTitle(pageId, title) {
    var $title = findTabTitle(pageId);//有tab的标题
    var $span = $title.children("span.page_tab_title");
    $span.text(title);
}

//计算多个jq对象的宽度和
var calSumWidth = function (element) {
    var width = 0;
    $(element).each(function () {
        width += $(this).outerWidth(true);
    });
    return width;
};
//滚动到指定选项卡
var scrollToTab = function (element) {
    //element是tab(a标签),装有标题那个
    //div.content-tabs > div.page-tabs-content
    var marginLeftVal = calSumWidth($(element).prevAll()),//前面所有tab的总宽度
        marginRightVal = calSumWidth($(element).nextAll());//后面所有tab的总宽度
    //一些按钮(向左,向右滑动)的总宽度
    var tabOuterWidth = calSumWidth($(".content-tabs").children().not(".menuTabs"));
    // tab(a标签)显示区域的总宽度
    var visibleWidth = $(".content-tabs").outerWidth(true) - tabOuterWidth;
    //将要滚动的长度
    var scrollVal = 0;
    if ($(".page-tabs-content").outerWidth() < visibleWidth) {
        //所有的tab都可以显示的情况
        scrollVal = 0;
    } else if (marginRightVal <= (visibleWidth - $(element).outerWidth(true) - $(element).next().outerWidth(true))) {
        //向右滚动
        //marginRightVal(后面所有tab的总宽度)小于可视区域-(当前tab和下一个tab的宽度)
        if ((visibleWidth - $(element).next().outerWidth(true)) > marginRightVal) {
            scrollVal = marginLeftVal;
            var tabElement = element;
            while ((scrollVal - $(tabElement).outerWidth()) > ($(".page-tabs-content").outerWidth() - visibleWidth)) {
                scrollVal -= $(tabElement).prev().outerWidth();
                tabElement = $(tabElement).prev();
            }
        }
    } else if (marginLeftVal > (visibleWidth - $(element).outerWidth(true) - $(element).prev().outerWidth(true))) {
        //向左滚动
        scrollVal = marginLeftVal - $(element).prev().outerWidth(true);
    }
    //执行动画
    $('.page-tabs-content').animate({
        marginLeft: 0 - scrollVal + 'px'
    }, "fast");
};
//滚动条滚动到左边
var scrollTabLeft = function () {
    var marginLeftVal = Math.abs(parseInt($('.page-tabs-content').css('margin-left')));
    var tabOuterWidth = calSumWidth($(".content-tabs").children().not(".menuTabs"));
    var visibleWidth = $(".content-tabs").outerWidth(true) - tabOuterWidth;
    var scrollVal = 0;
    if ($(".page-tabs-content").width() < visibleWidth) {
        return false;
    } else {
        var tabElement = $(".menu_tab:first");
        var offsetVal = 0;
        while ((offsetVal + $(tabElement).outerWidth(true)) <= marginLeftVal) {
            offsetVal += $(tabElement).outerWidth(true);
            tabElement = $(tabElement).next();
        }
        offsetVal = 0;
        if (calSumWidth($(tabElement).prevAll()) > visibleWidth) {
            while ((offsetVal + $(tabElement).outerWidth(true)) < (visibleWidth) && tabElement.length > 0) {
                offsetVal += $(tabElement).outerWidth(true);
                tabElement = $(tabElement).prev();
            }
            scrollVal = calSumWidth($(tabElement).prevAll());
        }
    }
    $('.page-tabs-content').animate({
        marginLeft: 0 - scrollVal + 'px'
    }, "fast");
};
//滚动条滚动到右边
var scrollTabRight = function () {
    var marginLeftVal = Math.abs(parseInt($('.page-tabs-content').css('margin-left')));
    var tabOuterWidth = calSumWidth($(".content-tabs").children().not(".menuTabs"));
    var visibleWidth = $(".content-tabs").outerWidth(true) - tabOuterWidth;
    var scrollVal = 0;
    if ($(".page-tabs-content").width() < visibleWidth) {
        return false;
    } else {
        var tabElement = $(".menu_tab:first");
        var offsetVal = 0;
        while ((offsetVal + $(tabElement).outerWidth(true)) <= marginLeftVal) {
            offsetVal += $(tabElement).outerWidth(true);
            tabElement = $(tabElement).next();
        }
        offsetVal = 0;
        while ((offsetVal + $(tabElement).outerWidth(true)) < (visibleWidth) && tabElement.length > 0) {
            offsetVal += $(tabElement).outerWidth(true);
            tabElement = $(tabElement).next();
        }
        scrollVal = calSumWidth($(tabElement).prevAll());
        if (scrollVal > 0) {
            $('.page-tabs-content').animate({
                marginLeft: 0 - scrollVal + 'px'
            }, "fast");
        }
    }
};

//关闭其他选项卡
var closeOtherTabs = function (isAll) {
    if (isAll) {
        //关闭全部
        $('.page-tabs-content').children("[" + pageIdField + "]").find('.fa-remove').parents('a').each(function () {
            var $a = $(this);
            var pageId = getPageId($a);
            closeTabOnly(pageId);

            // closeTab($a);
            /*$('#' + $(this).data('id')).remove();
             $(this).remove();*/
        });
        var firstChild = $(".page-tabs-content").children().eq(0); //选中那些删不掉的第一个菜单
        if (firstChild) {
            //激活这个选项卡
            activeTabByPageId(getPageId(firstChild));

            /*$('#' + firstChild.data('id')).addClass('active');
             firstChild.addClass('active');*/
        }
    } else {
        //除此之外全部删除
        $('.page-tabs-content').children("[" + pageIdField + "]").find('.fa-remove').parents('a').not(".active").each(function () {
            var $a = $(this);
            var pageId = getPageId($a);
            closeTabOnly(pageId);

            // closeTab($a);
            /*$('#' + $(this).data('id')).remove();
             $(this).remove();*/
        });

    }
};

//激活Tab,通过id
function activeTabByPageId(pageId) {
    $(".menu_tab").removeClass("active");
    $("#tab-content").find(".active").removeClass("active");
    //激活TAB
    var $title = findTabTitle(pageId).addClass('active');
    findTabPanel(pageId).addClass("active");
    // scrollToTab($('.menu_tab.active'));
    scrollToTab($title[0]);
}

$(function () {
    var $tabs = $(".menuTabs");
    //点击选项卡的时候就激活tab
    $tabs.on("click", ".menu_tab", function () {
        var pageId = getPageId(this);
        activeTabByPageId(pageId);
    });

    //双击选项卡刷新页面
    $tabs.on("dblclick", ".menu_tab", function () {
        // console.log("dbclick");
        var pageId = getPageId(this);
        refreshTabById(pageId);
    });

    //选项卡右键菜单
    function findTabElement(target) {
        var $ele = $(target);
        if (!$ele.is("a")) {
            $ele = $ele.parents("a.menu_tab");
        }
        return $ele;
    }

    context.init({
        preventDoubleContext: false,//不禁用原始右键菜单
        compress: true//元素更少的padding
    });
    context.attach('.page-tabs-content', [
//            {header: 'Options'},
        {
            text: '刷新',
            action: function (e, $selector, rightClickEvent) {
                //e是点击菜单的事件
                //$selector就是＄（".page-tabs-content")
                //rightClickEvent就是右键打开菜单的事件

                var pageId = getPageId(findTabElement(rightClickEvent.target));
                refreshTabById(pageId);

            }
        },
        {
            text: "在新窗口打开",
            action: function (e, $selector, rightClickEvent) {

                var pageId = getPageId(findTabElement(rightClickEvent.target));
                var url = getTabUrlById(pageId);
                window.open(url);

            }
        }
//            {text: 'Open in new Window', href: '#'},
//            {divider: true},
//            {text: 'Copy', href: '#'},
//            {text: 'Dafuq!?', href: '#'}
    ]);

});