function parseObj(strData) {
    return (new Function("return " + strData))();
}

function arrayToJson(o) {
    var r = [];
    if (typeof o == "string") return "\"" + o.replace(/([\'\"\\])/g, "\\$1").replace(/(\n)/g, "\\n").replace(/(\r)/g, "\\r").replace(/(\t)/g, "\\t") + "\"";
    if (typeof o == "object") {
        if (!o.sort) {
            for (var i in o)
                r.push(i + ":" + arrayToJson(o[i]));
            if (!!document.all && !/^\n?function\s*toString\(\)\s*\{\n?\s*\[native code\]\n?\s*\}\n?\s*$/.test(o.toString)) {
                r.push("toString:" + o.toString.toString());
            }
            r = "{" + r.join() + "}";
        } else {
            for (var i = 0; i < o.length; i++) {
                r.push(arrayToJson(o[i]));
            }
            r = "[" + r.join() + "]";
        }
        return r;
    }
    return o.toString();
}

function getHistory() {
    var history = $.cookie("history");
    if (history == null) {
        return null;
    }
    else {
        var cook = parseObj(history);
        return cook.slice(0,4);
    }
}

function setHistory(currentProduct) {
    
    var history = $.cookie("history");
    var cur = parseObj(currentProduct);

    if (history == null) {
        $.cookie("history", arrayToJson(cur), {expires: 7, path: '/'});
        return null;
    }
    else {
        var cook = parseObj(history);
        var haveindex = -1;

        $.each(cook, function (index, item) {
            if (item.type == cur[0].type && item.name == cur[0].name) {
                haveindex = index;
                return false;
            }
        });

        if (haveindex != -1) {
            cook.splice(haveindex, 1);
        }

        cook.unshift(cur[0]);

        if (cook.length > 5) {
            cook.pop();
        }

        $.cookie("history", arrayToJson(cook), {expires: 7, path: '/'});

        if (cook.length > 0) {
            cook.shift();
            return cook;
        }
        else {
            return null;
        }
    }
}