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#pragma once
 
#include "events.h" 
#include "event_local.h" 
#include <library/cpp/actors/protos/interconnect.pb.h>
#include <util/string/cast.h> 
#include <util/string/builder.h> 

namespace NActors {
    class TNodeLocation { 
    public:
        struct TKeys { 
            enum E : int { 
                DataCenter = 10, 
                Module = 20, 
                Rack = 30, 
                Unit = 40, 
            }; 
        }; 
 
        struct TLegacyValue { 
            ui32 DataCenter; 
            ui32 Room; 
            ui32 Rack; 
            ui32 Body; 
 
            auto ConvertToTuple() const { return std::make_tuple(DataCenter, Room, Rack, Body); } 
 
            int Compare(const TLegacyValue& other) const { 
                const auto x = ConvertToTuple(); 
                const auto y = other.ConvertToTuple(); 
                if (x < y) { 
                    return -1; 
                } else if (y < x) { 
                    return 1; 
                } else { 
                    return 0; 
                } 
            } 
 
            friend bool operator ==(const TLegacyValue& x, const TLegacyValue& y) { return x.Compare(y) == 0; } 
 
            void Serialize(NActorsInterconnect::TNodeLocation *pb) const { 
                pb->SetDataCenterNum(DataCenter); 
                pb->SetRoomNum(Room); 
                pb->SetRackNum(Rack); 
                pb->SetBodyNum(Body); 
            } 
        }; 
 
    private: 
        std::optional<TLegacyValue> LegacyValue; 
        std::vector<std::pair<TKeys::E, TString>> Items; 
 
    public: 
        // generic ctors 
        TNodeLocation() = default; 
        TNodeLocation(const TNodeLocation&) = default; 
        TNodeLocation(TNodeLocation&&) = default; 
 
        // protobuf-parser ctor 
        explicit TNodeLocation(const NActorsInterconnect::TNodeLocation& location); 

        // serialized protobuf ctor 
        static constexpr struct TFromSerialized {} FromSerialized {}; 
        TNodeLocation(TFromSerialized, const TString& s); 
 
        // parser helper function 
        static NActorsInterconnect::TNodeLocation ParseLocation(const TString& s); 
 
        // assignment operators 
        TNodeLocation& operator =(const TNodeLocation&) = default; 
        TNodeLocation& operator =(TNodeLocation&&) = default; 
 
        void Serialize(NActorsInterconnect::TNodeLocation *pb) const; 
        TString GetSerializedLocation() const; 
 
        TString GetDataCenterId() const { return ToStringUpTo(TKeys::DataCenter); } 
        TString GetModuleId() const { return ToStringUpTo(TKeys::Module); } 
        TString GetRackId() const { return ToStringUpTo(TKeys::Rack); } 
        TString ToString() const { return ToStringUpTo(TKeys::E(Max<int>())); } 
        TString ToStringUpTo(TKeys::E upToKey) const; 
 
        TLegacyValue GetLegacyValue() const; 
 
        const std::vector<std::pair<TKeys::E, TString>>& GetItems() const { return Items; } 
 
        bool HasKey(TKeys::E key) const { 
            auto comp = [](const auto& p, TKeys::E value) { return p.first < value; }; 
            const auto it = std::lower_bound(Items.begin(), Items.end(), key, comp); 
            return it != Items.end() && it->first == key; 
        } 
 
        int Compare(const TNodeLocation& other) const { 
            if (LegacyValue || other.LegacyValue) { 
                return GetLegacyValue().Compare(other.GetLegacyValue()); 
            } else if (Items < other.Items) { 
                return -1; 
            } else if (other.Items < Items) { 
                return 1; 
            } else { 
                return 0; 
            } 
        } 
 
        void InheritLegacyValue(const TNodeLocation& other) { 
            LegacyValue = other.GetLegacyValue(); 
        } 
 
        friend bool operator ==(const TNodeLocation& x, const TNodeLocation& y) { return x.Compare(y) == 0; } 
        friend bool operator !=(const TNodeLocation& x, const TNodeLocation& y) { return x.Compare(y) != 0; } 
        friend bool operator < (const TNodeLocation& x, const TNodeLocation& y) { return x.Compare(y) <  0; } 
        friend bool operator <=(const TNodeLocation& x, const TNodeLocation& y) { return x.Compare(y) <= 0; } 
        friend bool operator > (const TNodeLocation& x, const TNodeLocation& y) { return x.Compare(y) >  0; } 
        friend bool operator >=(const TNodeLocation& x, const TNodeLocation& y) { return x.Compare(y) >= 0; } 
    };

    struct TEvInterconnect {
        enum EEv {
            EvForward = EventSpaceBegin(TEvents::ES_INTERCONNECT),
            EvResolveNode, // resolve info about node (internal)
            EvNodeAddress, // node info (internal)
            EvConnectNode, // request proxy to establish connection (like: we would send something there soon)
            EvAcceptIncoming,
            EvNodeConnected,    // node connected notify
            EvNodeDisconnected, // node disconnected notify
            EvRegisterNode,
            EvRegisterNodeResult,
            EvListNodes,
            EvNodesInfo,
            EvDisconnect,
            EvGetNode,
            EvNodeInfo,
            EvClosePeerSocket, 
            EvCloseInputSession, 
            EvPoisonSession, 
            EvTerminate, 
            EvEnd
        };
 
        enum ESubscribes {
            SubConnected,
            SubDisconnected,
        };

        static_assert(EvEnd < EventSpaceEnd(TEvents::ES_INTERCONNECT), "expect EvEnd < EventSpaceEnd(TEvents::ES_INTERCONNECT)");

        struct TEvResolveNode;
        struct TEvNodeAddress;

        struct TEvConnectNode: public TEventBase<TEvConnectNode, EvConnectNode> {
            DEFINE_SIMPLE_LOCAL_EVENT(TEvConnectNode, "TEvInterconnect::TEvConnectNode")
        };

        struct TEvAcceptIncoming;

        struct TEvNodeConnected: public TEventLocal<TEvNodeConnected, EvNodeConnected> {
            DEFINE_SIMPLE_LOCAL_EVENT(TEvNodeConnected, "TEvInterconnect::TEvNodeConnected")
            TEvNodeConnected(ui32 node) noexcept
                : NodeId(node)
            {
            }
            const ui32 NodeId;
        };

        struct TEvNodeDisconnected: public TEventLocal<TEvNodeDisconnected, EvNodeDisconnected> {
            DEFINE_SIMPLE_LOCAL_EVENT(TEvNodeDisconnected, "TEvInterconnect::TEvNodeDisconnected")
            TEvNodeDisconnected(ui32 node) noexcept
                : NodeId(node)
            {
            }
            const ui32 NodeId;
        };

        struct TEvRegisterNode;
        struct TEvRegisterNodeResult;

        struct TEvListNodes: public TEventLocal<TEvListNodes, EvListNodes> {
        };

        struct TNodeInfo {
            ui32 NodeId;
            TString Address;
            TString Host;
            TString ResolveHost;
            ui16 Port;
            TNodeLocation Location; 

            TNodeInfo() = default;
            TNodeInfo(const TNodeInfo&) = default;
            TNodeInfo& operator =(const TNodeInfo&) = default;
            TNodeInfo(ui32 nodeId,
                      const TString& address,
                      const TString& host,
                      const TString& resolveHost,
                      ui16 port,
                      const TNodeLocation& location) 
                : NodeId(nodeId)
                , Address(address)
                , Host(host)
                , ResolveHost(resolveHost)
                , Port(port)
                , Location(location)
            {
            }

            operator ui32() const {
                return NodeId;
            }
        };

        struct TEvNodesInfo: public TEventLocal<TEvNodesInfo, EvNodesInfo> {
            TVector<TNodeInfo> Nodes;

            const TNodeInfo* GetNodeInfo(ui32 nodeId) const {
                for (const auto& x : Nodes) {
                    if (x.NodeId == nodeId)
                        return &x;
                }
                return nullptr;
            }
        };

        struct TEvDisconnect;

        struct TEvGetNode: public TEventLocal<TEvGetNode, EvGetNode> {
            ui32 NodeId;
            TInstant Deadline; 

            TEvGetNode(ui32 nodeId, TInstant deadline = TInstant::Max()) 
                : NodeId(nodeId)
                , Deadline(deadline) 
            {
            }
        };

        struct TEvNodeInfo: public TEventLocal<TEvNodeInfo, EvNodeInfo> {
            TEvNodeInfo(ui32 nodeId)
                : NodeId(nodeId)
            {
            }

            ui32 NodeId;
            THolder<TNodeInfo> Node;
        };
 
        struct TEvClosePeerSocket : TEventLocal<TEvClosePeerSocket, EvClosePeerSocket> {};
 
        struct TEvCloseInputSession : TEventLocal<TEvCloseInputSession, EvCloseInputSession> {};
 
        struct TEvPoisonSession : TEventLocal<TEvPoisonSession, EvPoisonSession> {}; 
 
        struct TEvTerminate : TEventLocal<TEvTerminate, EvTerminate> {}; 
    };
}