#pragma once

#include <optional>
#include <string>
#include <string_view>
#include <unordered_map>

#include "nlohmann/json.hpp"

// 前置声明，避免头文件膨胀
namespace httplib
{
class Client;
}

class TboxConfigClient
{
   public:
    explicit TboxConfigClient(std::string server = "127.0.0.1", int port = 18080);

    // ================= 拉取配置 =================
    bool fetch();

    uint64_t version() const;
    bool isDirty() const;

    // ================= 读取 =================
    std::optional<std::string> getString(std::string_view semantic) const;
    std::optional<int> getInt(std::string_view semantic) const;
    std::optional<bool> getBool(std::string_view semantic) const;

    // ================= 修改（仅本地 staging） =================
    void setString(std::string_view semantic, const std::string& v);
    void setInt(std::string_view semantic, int v);
    void setBool(std::string_view semantic, bool v);

    // ================= 提交并确认 =================
    bool commitAndFetch();

   private:
    std::string server_;
    int port_;
    uint64_t version_{0};
    bool dirty_{false};

    std::unordered_map<std::string, nlohmann::json> cache_;
    std::unordered_map<std::string, nlohmann::json> pending_;
};