#pragma once

#include <unordered_map>
#include <functional>
#include <string>
#include <memory>
#include <thread>
#include <mutex>
#include <vector>
#include <stdexcept>
#include "IpAddress.hpp"
#include "../types.hpp"
#include "../utils.hpp"
#include "Socket.hpp"
#include "Message.hpp"
#include <future>

namespace sibs
{
    class SocketCreateException : public std::runtime_error
    {
    public:
        SocketCreateException(const std::string &errMsg) : std::runtime_error(errMsg) {}
    };
    
    enum class PubSubResult
    {
        RESULT_OK,
        RESULT_ERROR
    };
    
    struct DirectConnectionPeer;

    struct PubSubConnectResult
    {
        std::shared_ptr<DirectConnectionPeer> peer;
        PubSubResult result;
        std::string resultStr;
    };
    
    using PubSubConnectCallback = std::function<void(std::shared_ptr<DirectConnectionPeer> peer, PubSubResult result, const std::string &resultStr)>;
    using PubSubReceiveDataCallback = std::function<void(std::shared_ptr<DirectConnectionPeer> peer, MessageType messageType, const void *data, const usize size)>;
    using PubSubSendDataCallback = std::function<void(PubSubResult result, const std::string &resultStr)>;
    using PubSubOnRemoveDisconnectedPeerCallback = std::function<void(std::shared_ptr<DirectConnectionPeer> peer)>;

    enum class PeerType
    {
        SERVER,
        CLIENT
    };
    
    struct DirectConnectionPeer
    {
        std::unique_ptr<Socket> socket;
        Ipv4 address;
        PubSubReceiveDataCallback receiveDataCallbackFunc;
        int sharedKeys = 0;
        PeerType type = PeerType::CLIENT;
        bool routed = false;

        bool operator == (const DirectConnectionPeer &other) const;
        bool operator != (const DirectConnectionPeer &other) const;
    };
    
    class DirectConnections
    {
        DISABLE_COPY(DirectConnections)
        friend class BootstrapNode;
    public:
        DirectConnections(u16 port = 0);
        ~DirectConnections();
        
        // Throws ConnectionException on error
        void connectServer(const Ipv4 &address, PubSubConnectCallback connectCallbackFunc, PubSubReceiveDataCallback receiveDataCallbackFunc);
        // Throws ConnectionException on error
        void connect(const Ipv4 &address, PubSubConnectCallback connectCallbackFunc, PubSubReceiveDataCallback receiveDataCallbackFunc);
        // Returns false if data is larger than 800kb
        bool send(const std::shared_ptr<DirectConnectionPeer> peer, std::shared_ptr<Message> data, PubSubSendDataCallback sendDataCallbackFunc = nullptr);

        void onRemoveDisconnectedPeer(PubSubOnRemoveDisconnectedPeerCallback callbackFunc);
        bool removePeer(int peerSocket);

        std::vector<std::shared_ptr<DirectConnectionPeer>> getPeers();
    protected:
        std::unique_ptr<Socket> createSocket(const Ipv4 &addressToBind, bool rendezvous, bool reuseAddr, bool bind = true);
    private:
        void connect(const Ipv4 &address, bool rendezvous, bool reuseAddr, PubSubConnectCallback connectCallbackFunc, PubSubReceiveDataCallback receiveDataCallbackFunc, bool bind, bool server);
        void removeDisconnectedPeers();
        void receiveData();
        int receiveDataFromPeer(const int socket, char *output, usize *receivedTotalSize);
    private:
        u16 port;
        int eid;
        std::unordered_map<int, std::shared_ptr<DirectConnectionPeer>> peers;
        std::thread receiveDataThread;
        std::mutex peersMutex;
        bool alive;
        PubSubOnRemoveDisconnectedPeerCallback removeDisconnectedPeerCallback;
        Ipv4Map<std::shared_future<PubSubConnectResult>> connectionResults;
        std::mutex connectionResultsMutex; 
    };

    struct DirectConnectionsUtils
    {
        static std::vector<u8> serializePeers(const std::vector<std::shared_ptr<DirectConnectionPeer>> &peers);
        // Throws DeserializeException on error
        static std::vector<std::shared_ptr<DirectConnectionPeer>> deserializePeers(const u8 *data, const usize size);
    };
}