#ifndef VRSHAREMEM_H
#define VRSHAREMEM_H

#include "IVrShareMem.h"
#include <string>
#include <mutex>
#include <chrono>

#ifdef _WIN32
    #include <windows.h>
#else
    #include <sys/mman.h>
    #include <sys/stat.h>
    #include <fcntl.h>
    #include <unistd.h>
#endif

/**
 * @brief 共享内存实现类
 * 提供 Windows 和 Linux 平台的共享内存操作实现
 */
class VrShareMem : public IVrShareMem
{
public:
    VrShareMem();
    virtual ~VrShareMem();

    // 实现 IVrShareMem 接口
    virtual int CreateOrOpen(const std::string& name, size_t size, bool create = true) override;
    virtual void* MapView() override;
    virtual int UnmapView() override;
    virtual int Close() override;
    virtual size_t GetSize() const override;
    virtual void* GetMappedAddress() const override;
    virtual bool IsValid() const override;
    virtual int WriteData(size_t offset, const void* data, size_t size) override;
    virtual int ReadData(size_t offset, void* buffer, size_t size) override;
    virtual int Lock(int timeout = -1) override;
    virtual int Unlock() override;

private:
    std::string m_name;           // 共享内存名称
    size_t m_size;               // 内存大小
    void* m_mappedAddress;       // 映射地址
    bool m_created;              // 是否创建者

#ifdef _WIN32
    HANDLE m_hMapFile;           // Windows 文件映射句柄
#else
    int m_fd;                    // Linux 文件描述符
#endif

    std::timed_mutex m_mutex;    // 互斥锁

    // 私有辅助方法
    std::string GetPlatformName(const std::string& name) const;
    bool CheckBounds(size_t offset, size_t size) const;
};

#endif // VRSHAREMEM_H