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#pragma once

#include <util/digest/numeric.h>
#include <util/generic/hash.h>
#include <util/generic/ptr.h>
#include <util/generic/strbuf.h>
#include <util/generic/vector.h>
#include <util/network/address.h>

namespace NBus {
    using namespace NAddr; 

    /// IP protocol version. 
    enum EIpVersion { 
        EIP_VERSION_4 = 1, 
        EIP_VERSION_6 = 2, 
        EIP_VERSION_ANY = EIP_VERSION_4 | EIP_VERSION_6, 
    }; 

    inline bool IsFamilyAllowed(ui16 sa_family, EIpVersion ipVersion) { 
        if (ipVersion == EIP_VERSION_4 && sa_family != AF_INET) { 
            return false; 
        } 
        if (ipVersion == EIP_VERSION_6 && sa_family != AF_INET6) { 
            return false; 
        } 
        return true; 
    }

    const char* ToCString(EIpVersion); 
    int ToAddrFamily(EIpVersion); 

    /// Hold referenced pointer to address description structure (ex. sockaddr_storage) 
    /// It's make possible to work with IPv4 / IPv6 addresses simultaneously 
    class TNetAddr: public IRemoteAddr { 
    public: 
        class TError: public yexception { 
        }; 

        TNetAddr(); 
        TNetAddr(TAutoPtr<IRemoteAddr> addr); 
        TNetAddr(const char* hostPort, EIpVersion requireVersion = EIP_VERSION_ANY, EIpVersion preferVersion = EIP_VERSION_ANY); 
        TNetAddr(TStringBuf host, int port, EIpVersion requireVersion = EIP_VERSION_ANY, EIpVersion preferVersion = EIP_VERSION_ANY); 
        TNetAddr(const TNetworkAddress& na, EIpVersion requireVersion = EIP_VERSION_ANY, EIpVersion preferVersion = EIP_VERSION_ANY); 
        TNetAddr(const TNetworkAddress& na, const TAddrInfo& ai); 

        bool operator==(const TNetAddr&) const; 
        bool operator!=(const TNetAddr& other) const { 
            return !(*this == other); 
        } 
        inline explicit operator bool() const noexcept { 
            return !!Ptr; 
        } 

        const sockaddr* Addr() const override; 
        socklen_t Len() const override; 

        bool IsIpv4() const; 
        bool IsIpv6() const; 
        int GetPort() const; 

    private: 
        TAtomicSharedPtr<IRemoteAddr> Ptr; 
    }; 

    using TSockAddrInVector = TVector<TNetAddr>; 

    struct TNetAddrHostPortHash { 
        inline size_t operator()(const TNetAddr& a) const { 
            const sockaddr* s = a.Addr(); 
            const sockaddr_in* const sa = reinterpret_cast<const sockaddr_in*>(s); 
            const sockaddr_in6* const sa6 = reinterpret_cast<const sockaddr_in6*>(s); 

            switch (s->sa_family) { 
                case AF_INET: 
                    return CombineHashes<size_t>(ComputeHash(TStringBuf(reinterpret_cast<const char*>(&sa->sin_addr), sizeof(sa->sin_addr))), IntHashImpl(sa->sin_port));

                case AF_INET6: 
                    return CombineHashes<size_t>(ComputeHash(TStringBuf(reinterpret_cast<const char*>(&sa6->sin6_addr), sizeof(sa6->sin6_addr))), IntHashImpl(sa6->sin6_port));
            } 

            return ComputeHash(TStringBuf(reinterpret_cast<const char*>(s), a.Len()));
        }
    }; 

}