/***
    Copyright (C) 2022 J Reece Wilson (a/k/a "Reece"). All rights reserved.

    File: IPCHandle.hpp
    Date: 2022-4-13
    Author: Reece
***/
#pragma once

namespace Aurora::IO::IPC
{
    AUE_DEFINE(EIPCHandleType, (
        eIPCPipe,
        eIPCMemory,
        eIPCSharedFd,
        eIPCPrimitiveSemaphore,
        eIPCPrimitiveMutex,
        eIPCPrimitiveEvent,
        eIPCPipeEnd
    ));

    struct IPCToken
    {
        IPCToken();

        AuUInt word {};
        AuUInt32 pid {};
        union
        {
            char path[16];
            struct
            {
                AuUInt32 cookie;
            };
        };

        void NewId();

        AuString ToNTPath() const;
        AuUInt32 ToUnixServerCookie() const;
        
#if defined(AURORA_IS_POSIX_DERIVED)
        pid_t ToUnixPid() const;
#endif
    };

    struct IPCValue
    {
        EIPCHandleType subtype;
        IPCToken token;
    };

#pragma pack(push)
#pragma pack(1)
    struct IPCHeader
    {
        union
        {
            struct
            {
                AuUInt8 bmType : 3;
                AuUInt8 bmHasWord : 1;
                AuUInt8 bmHasPid : 1;
                AuUInt8 bmArray : 3;
            };
            AuUInt8 bValue;
        };
    };
#pragma pack(pop)

    static_assert(sizeof(IPCHeader) == 1);

    struct IPCHandle
    {
        IPCHandle();

        bool IsTopEq(EIPCHandleType type) const;
        bool PushId(EIPCHandleType type, const IPCToken &token);

        IPCValue *GetToken(EIPCHandleType type, int id);

        AuUInt32 pid {};

        AuList<IPCValue> values;

        bool FromString(const AuString &in);

        AuString ToString() const;

#if defined(AURORA_IS_POSIX_DERIVED)
        pid_t ToUnixPid() const;
#endif
    };
}