/*
 * @Description: 车位分配算法模块，使用单例模式，接收外部请求并通过调用通信块接口发送反馈
 * @Author: yct
 * @Date: 2020-07-10 09:25:56
 * @LastEditTime: 2020-08-06 10:18:56
 * @LastEditors: yct
 */ 

#ifndef PARKSPACE_ALLOCATOR_HH
#define PARKSPACE_ALLOCATOR_HH

#include "../tool/thread_pool.h"
#include "../tool/singleton.h"
#include "../error_code/error_code.h"
#include "../communication/communication_message.h"
#include "../message/parkspace_allocation_message.pb.h"
#include "parkspace_db_manager.h"
#include <ctime>

class Parkspace_allocator : public Singleton<Parkspace_allocator>
{
    friend class Singleton<Parkspace_allocator>;
public:
    enum parkspace_allocator_status
    {
        eParkspace_allocator_unknown,
        eParkspace_allocator_normal,
        eParkspace_allocator_fault
    };

private:
    // 父类的构造函数必须保护，子类的构造函数必须私有。
    Parkspace_allocator();
public:
    // 必须关闭拷贝构造和赋值构造，只能通过 get_instance 函数来进行操作唯一的实例。
    Parkspace_allocator(const Parkspace_allocator &) = delete;
    Parkspace_allocator &operator=(const Parkspace_allocator &) = delete;
    ~Parkspace_allocator();
public://API functions
	//初始化
	Error_manager parkspace_allocator_init(int threads_size, parkspace_proto::database_config db_config);
	//反初始化
	Error_manager parkspace_allocator_uninit();

	//检查执行者的状态, 判断能否处理这条消息,
	Error_manager check_executer(Communication_message* p_msg);
	//处理消息的执行函数
	Error_manager execute_msg(Communication_message* p_msg);

	//判断是否为待机，如果已经准备好，则可以执行任务。
	bool is_ready();

    // 获取模块状态
    parkspace_allocator_status get_parkspace_allocator_status();

    // 检查车辆是否已存在，通常分配前调用
    bool check_car_existence(std::string license, message::Parkspace_allocation_status_msg status_msg);

public://execute_msg创建各线程进行处理
	//分配车位线程函数
    void execute_for_allocate(message::Car_info car_info, int terminal_id,std::string command_key);
    //查询车位线程函数
    void execute_for_search(message::Car_info car_info,std::string command_key);
    //释放车位线程函数
    void execute_for_release(message::Parkspace_info space_info, std::string command_key);
    //强制更新车位信息线程函数
    void execute_for_force_update(message::Parkspace_info space_info, std::string command_key);
    //确认分配车位线程函数
    void execute_for_confirm_alloc(message::Parkspace_info space_info, std::string command_key);

private:
    parkspace_allocator_status  m_current_status;               //分配器当前状态
	Thread_pool 				m_thread_pool;					//执行多任务的线程池
    std::mutex                  m_mutex;                        //车位变动锁
    Parkspace_db_manager*       mp_db_manager;                  //车位模块数据库管理句柄

};

#endif // !PARKSPACE_ALLOCATOR_HH