/**
 * @file mix_cc/ihyper_db/connection.h
 * @brief ihyperDB的连接库
 * @author Cat (null.null.null@qq.com)
 * @version 0.1
 * @date 2020-12-12
 *
 * Copyright: Baosight Co. Ltd.
 * DO NOT COPY/USE WITHOUT PERMISSION
 *
 */
#pragma once

#include "mix_cc/fp.h"
#include "mix_cc/ihyper_db/utility.h"
#include "mix_cc/type/mix_time.h"
#include <atomic>
#include <future>
#include <mutex>
#include <numeric>
#include <stdint.h>
#include <string>
#include <thread>
#include <vector>

namespace mix_cc {

namespace ihd {
/**
 * @brief IhyperDB的连接
 */
struct Connection {
  // 由于iHyperDB的设计独特，一个进程只使用一个iHyperDB连接
  // 且ihyperDB的连接一经建立，即使断开网络连接，也不会自动释放，故不再对其使用手动释放
  struct Config {
    // 基本信息
    std::string username;
    std::string password;
    HD3Connection hd3_conn;
  };
  enum class State { disconnected, connected };
  Config config;
  State state;
  std::thread::id tid;
};

auto read_conn_config_maybe() -> maybe<Connection::Config>;

auto init_conn_maybe(maybe<Connection::Config>&& conn_config_maybe)
    -> maybe<Connection>;

auto disconnect_maybe(maybe<Connection> conn_maybe) -> maybe<Connection>;

auto connect_maybe(maybe<Connection> conn_maybe) -> maybe<Connection>;

auto read_conn_state() -> Connection::State;

auto read_conn() -> Connection;

auto store_conn_to_local(Connection& conn) -> Connection;

auto auto_connect() -> maybe<Connection>;

}  // namespace ihd
}  // namespace mix_cc