var Cookies = {};

Cookies.set = function (name, value) {

    var argv = arguments;

    var argc = arguments.length;

    var expires = (argc > 2) ? argv[2] : null;

    var path = (argc > 3) ? argv[3] : '/';

    var domain = (argc > 4) ? argv[4] : null;

    var secure = (argc > 5) ? argv[5] : false;

    document.cookie = name + "=" + escape(value) +

      ((expires == null) ? "" : ("; expires=" + expires.toGMTString())) +

      ((path == null) ? "" : ("; path=" + path)) +

      ((domain == null) ? "" : ("; domain=" + domain)) +

      ((secure == true) ? "; secure" : "");

};

Cookies.get = function (name) {

    var arg = name + "=";

    var alen = arg.length;

    var clen = document.cookie.length;

    var i = 0;

    var j = 0;

    while (i < clen) {

        j = i + alen;

        if (document.cookie.substring(i, j) == arg)

            return Cookies.getCookieVal(j);

        i = document.cookie.indexOf(" ", i) + 1;

        if (i == 0)

            break;

    }

    return null;

};

Cookies.clear = function (name) {

    if (Cookies.get(name)) {

        var expdate = new Date();

        expdate.setTime(expdate.getTime() - (86400 * 1000 * 1));

        Cookies.set(name, "", expdate);

    }

};

Cookies.getCookieVal = function (offset) {

    var endstr = document.cookie.indexOf(";", offset);

    if (endstr == -1) {

        endstr = document.cookie.length;

    }

    return unescape(document.cookie.substring(offset, endstr));

};

var Global = {};

Global.getParam = function (param) {

    var params = Ext.urlDecode(location.search.substring(1));

    return param ? params[param] : params;

}

//购物车

var ShoppingCart = {};

//新增商品

ShoppingCart.add = function (cid, did, price) {

    var ck = Global.getParam("sid") + "_" + Global.getParam("uid") + "_sc";

    if (Cookies.get(ck) == null) {

        var exp = new Date();

        exp.setTime(exp.getTime() + 7 * 24 * 60 * 60 * 1000);

        Cookies.set(ck, JSON.stringify({ TotalCount: 0, TotalMoney: 0 }), exp);

    }

    var cart = eval('(' + Cookies.get(ck) + ')');

    //类别

    if (cart[cid] == undefined) {

        cart[cid] = { num: 0 };

    }

    //商品

    if (cart[did] == undefined) {

        cart[did] = { cid: cid, num: 0 };

    }

    //计算

    if (cart[did].num < 9) {

        cart[did].num = cart[did].num + 1;

        //类别（方便查找）

        cart[cid].num = cart[cid].num + 1;

        //总数量，总金额

        cart["TotalCount"] = cart["TotalCount"] + 1;

        cart["TotalMoney"] = cart["TotalMoney"] + price;

    }

    console.log(cart);

    Cookies.set(ck, JSON.stringify(cart));

};

//移除商品

ShoppingCart.remove = function (cid, did, price) {

    var ck = Global.getParam("sid") + "_" + Global.getParam("uid") + "_sc";

    var cart = eval('(' + Cookies.get(ck) + ')');

    if (cart[did] != undefined && cart[did].num > 0) {

        cart[did].num = cart[did].num - 1;

        cart["TotalCount"] = cart["TotalCount"] - 1;

        cart["TotalMoney"] = cart["TotalMoney"] - price;

        if (cart[cid] != undefined) {

            cart[cid].num = cart[cid].num - 1;

        }

    }

    Cookies.set(ck, JSON.stringify(cart));

};

//清空购物车

ShoppingCart.clear = function () {

    var ck = Global.getParam("sid") + "_" + Global.getParam("uid") + "_sc";

    Cookies.clear(ck);

};

//获取某商品的数量

ShoppingCart.getGoodNum = function (did) {

    var ck = Global.getParam("sid") + "_" + Global.getParam("uid") + "_sc";

    if (Cookies.get(ck) == null)

        return 0;

    var cart = eval('(' + Cookies.get(ck) + ')');

    if (cart[did] == undefined)

        return 0;

    else

        return cart[did].num;

};

//显示购物车的总数量和价格

ShoppingCart.displayTotal = function () {

    var ck = Global.getParam("sid") + "_" + Global.getParam("uid") + "_sc";

    if (Cookies.get(ck) == null)

        return "数量：0，金额：￥0";

    var cart = eval('(' + Cookies.get(ck) + ')');

    return "数量：" + cart["TotalCount"] + "，金额：￥" + cart["TotalMoney"];

};