/*==LICENSE==*

CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011  Cyan Worlds, Inc.

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

Additional permissions under GNU GPL version 3 section 7

If you modify this Program, or any covered work, by linking or
combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK,
NVIDIA PhysX SDK, Microsoft DirectX SDK, OpenSSL library, Independent
JPEG Group JPEG library, Microsoft Windows Media SDK, or Apple QuickTime SDK
(or a modified version of those libraries),
containing parts covered by the terms of the Bink SDK EULA, 3ds Max EULA,
PhysX SDK EULA, DirectX SDK EULA, OpenSSL and SSLeay licenses, IJG
JPEG Library README, Windows Media SDK EULA, or QuickTime SDK EULA, the
licensors of this Program grant you additional
permission to convey the resulting work. Corresponding Source for a
non-source form of such a combination shall include the source code for
the parts of OpenSSL and IJG JPEG Library used as well as that of the covered
work.

You can contact Cyan Worlds, Inc. by email legal@cyan.com
 or by snail mail at:
      Cyan Worlds, Inc.
      14617 N Newport Hwy
      Mead, WA   99021

*==LICENSE==*/
/*****************************************************************************
*
*   $/Plasma20/Sources/Plasma/NucleusLib/pnNetDiag/pnNdTcp.cpp
*   
***/

#include "Pch.h"
#pragma hdrstop

/*****************************************************************************
*
*   Local types
*
***/

struct AuthConn : AtomicRef {
    NetDiag *               diag;
    FNetDiagDumpProc        dump;
    FNetDiagTestCallback    callback;
    void *                  param;
    AsyncSocket             sock;
    AsyncCancelId           cancelId;
    NetCli *                cli;
    long                    pingsInRoute;
    long                    pingsCompleted;
    bool                    done;
    ENetError               error;
    
    ~AuthConn ();
};

struct AuthTrans : THashKeyVal<unsigned> {
    HASHLINK(AuthTrans) link;
    AuthConn *  conn;
    unsigned    pingAtMs;

    AuthTrans (AuthConn * conn);    
    ~AuthTrans ();
};

struct FileConn : AtomicRef {
    NetDiag *               diag;
    FNetDiagDumpProc        dump;
    FNetDiagTestCallback    callback;
    void *                  param;
    AsyncSocket             sock;
    AsyncCancelId           cancelId;
    ARRAY(uint8_t)             recvBuffer;
    long                    pingsInRoute;
    long                    pingsCompleted;
    bool                    done;
    ENetError               error;
    
    ~FileConn ();
};

struct FileTrans : THashKeyVal<unsigned> {
    HASHLINK(FileTrans) link;
    FileConn *  conn;
    unsigned    pingAtMs;
    
    FileTrans (FileConn * conn);
    ~FileTrans ();
};



/*****************************************************************************
*
*   Local data
*
***/

static const unsigned kPingTimeoutMs    = 5000;
static const unsigned kTimeoutCheckMs   = 100;
static const unsigned kMaxPings         = 15;   


static long         s_authProtocolRegistered;
static unsigned     s_transId;
static CCritSect    s_critsect;
static bool         s_shutdown;
static uint8_t         s_payload[32];
static AsyncTimer * s_timer;

static HASHTABLEDECL(
    AuthTrans,
    THashKeyVal<unsigned>,
    link
) s_authTrans;

static HASHTABLEDECL(
    FileTrans,
    THashKeyVal<unsigned>,
    link
) s_fileTrans;


/*****************************************************************************
*
*   Cli2Auth protocol
*
***/

//============================================================================
static bool Recv_PingReply (
    const uint8_t      msg[],
    unsigned        bytes,
    void *
) {
    const Auth2Cli_PingReply & reply = *(const Auth2Cli_PingReply *)msg;
    
    AuthTrans * trans;
    s_critsect.Enter();
    {
        if (bytes < sizeof(Auth2Cli_PingReply)) {
            // beta6 compatibility
            if (nil != (trans = s_authTrans.Tail()))
                s_authTrans.Unlink(trans);
        }
        else if (nil != (trans = s_authTrans.Find(reply.transId)))
            s_authTrans.Unlink(trans);
    }
    s_critsect.Leave();

    if (trans) {
        unsigned replyAtMs = TimeGetMs();
        trans->conn->dump(L"[TCP] Reply from SrvAuth. ms=%u", replyAtMs - trans->pingAtMs);
        delete trans;
        return true;
    }
    else {
        return false;
    }
}

//============================================================================
#define MSG(s)  kNetMsg_Cli2Auth_##s
static NetMsgInitSend s_send[] = {
    { MSG(PingRequest)              },
};

#undef MSG
#define MSG(s)  kNetMsg_Auth2Cli_##s, Recv_##s
static NetMsgInitRecv s_recv[] = {
    { MSG(PingReply)                },
};
#undef MSG


/*****************************************************************************
*
*   Local functions
*
***/

//============================================================================
static unsigned TimerCallback (void *) {

    unsigned timeMs = TimeGetMs();
    s_critsect.Enter();
    {
        ENetError error = kNetErrTimeout;
        {for (AuthTrans * next, * curr = s_authTrans.Head(); curr; curr = next) {
            next = s_authTrans.Next(curr);
            unsigned diff = timeMs - curr->pingAtMs;
            if (diff > kPingTimeoutMs) {
                if (!curr->conn->error)
                    curr->conn->error = error;
                curr->conn->dump(L"[TCP] No reply from SrvAuth: %u, %s (ms=%u)", error, NetErrorToString(error), diff);
                delete curr;
            }
        }}
        {for (FileTrans * next, * curr = s_fileTrans.Head(); curr; curr = next) {
            next = s_fileTrans.Next(curr);
            unsigned diff = timeMs - curr->pingAtMs;
            if (diff > kPingTimeoutMs) {
                if (!curr->conn->error)
                    curr->conn->error = error;
                curr->conn->dump(L"[TCP] No reply from SrvFile: %u, %s (ms=%u)", error, NetErrorToString(error), diff);
                delete curr;
            }
        }}
    }
    s_critsect.Leave();
    
    return kTimeoutCheckMs;
}

//============================================================================
static void AuthPingProc (void * param) {

    AuthConn * conn = (AuthConn *)param;

    while (!conn->done && conn->pingsCompleted < kMaxPings) {

        if (!conn->pingsInRoute) {

            AuthTrans * trans = new AuthTrans(conn);
            trans->pingAtMs = TimeGetMs();

            s_critsect.Enter();
            for (;;) {
                if (conn->done) {
                    conn->pingsCompleted = kMaxPings;
                    delete trans;
                    break;
                }
                while (++s_transId == 0)
                    NULL_STMT;
                trans->SetValue(s_transId);
                s_authTrans.Add(trans);

                const uintptr_t msg[] = {
                    kCli2Auth_PingRequest,
                                    trans->pingAtMs,
                                    trans->GetValue(),
                                    sizeof(s_payload),
                    (uintptr_t)  s_payload,
                };
                
                NetCliSend(conn->cli, msg, arrsize(msg));
                NetCliFlush(conn->cli);
                break;
            }
            s_critsect.Leave();
        }
        AsyncSleep(10);
    }

    s_critsect.Enter();
    {   
        conn->done = true;
        AsyncSocketDisconnect(conn->sock, true);
        NetCliDelete(conn->cli, false);
        conn->cli = nil;
    }
    s_critsect.Leave();
        
    conn->DecRef("Pinging");
}

//============================================================================
static bool AuthConnEncrypt (ENetError error, void * param) {

    AuthConn * conn = (AuthConn *)param;
    
    if (IS_NET_SUCCESS(error)) {
        conn->dump(L"[TCP] SrvAuth stream encrypted.");
        conn->dump(L"[TCP] Pinging SrvAuth with 32 bytes of data...");
        conn->IncRef("Pinging");
        _beginthread(AuthPingProc, 0, conn);
    }
    else {
        conn->dump(L"[TCP] SrvAuth stream encryption failed: %u, %s", error, NetErrorToString(error));
    }
    
    return IS_NET_SUCCESS(error);
}

//============================================================================
static void NotifyAuthConnSocketConnect (AuthConn * conn) {

    conn->dump(L"[TCP] SrvAuth socket established, encrypting stream...");
    
    conn->TransferRef("Connecting", "Connected");
    conn->cli = NetCliConnectAccept(
        conn->sock,
        kNetProtocolCli2Auth,
        false,
        AuthConnEncrypt,
        0,
        nil,
        conn
    );
}

//============================================================================
static void NotifyAuthConnSocketConnectFailed (AuthConn * conn) {

    conn->error = kNetErrConnectFailed;

    conn->cancelId = 0;
    conn->dump(L"[TCP] SrvAuth socket connection failed %u, %s", conn->error, NetErrorToString(conn->error));

    conn->DecRef("Connecting");
}

//============================================================================
static void NotifyAuthConnSocketDisconnect (AuthConn * conn) {

    if (!conn->done && !conn->error)
        conn->error = kNetErrDisconnected;

    conn->cancelId = 0;
    conn->dump(L"[TCP] SrvAuth socket closed: %u, %s", conn->error, NetErrorToString(conn->error));

    HASHTABLEDECL(
        AuthTrans,
        THashKeyVal<unsigned>,
        link
    ) authTrans;
    
    s_critsect.Enter();
    {
        conn->done = true;
        while (AuthTrans * trans = s_authTrans.Head())
            authTrans.Add(trans);
    }
    s_critsect.Leave();
    
    while (AuthTrans * trans = authTrans.Head()) {
        conn->dump(L"[TCP] No reply from SrvAuth: %u, %s", conn->error, NetErrorToString(conn->error));
        delete trans;
    }
    
    conn->DecRef("Connected");
}

//============================================================================
static bool NotifyAuthConnSocketRead (AuthConn * conn, AsyncNotifySocketRead * read) {

    NetCliDispatch(conn->cli, read->buffer, read->bytes, conn);
    read->bytesProcessed += read->bytes;
    
    return true;
}

//============================================================================
static bool AuthSocketNotifyCallback (
    AsyncSocket         sock,
    EAsyncNotifySocket  code,
    AsyncNotifySocket * notify,
    void **             userState
) {
    bool result = true;
    AuthConn * conn;

    switch (code) {
        case kNotifySocketConnectSuccess:
            conn = (AuthConn *) notify->param;
            *userState      = conn;
            conn->sock      = sock;
            conn->cancelId  = 0;
            NotifyAuthConnSocketConnect(conn);
        break;

        case kNotifySocketConnectFailed:
            conn = (AuthConn *) notify->param;
            NotifyAuthConnSocketConnectFailed(conn);
        break;

        case kNotifySocketDisconnect:
            conn = (AuthConn *) *userState;
            NotifyAuthConnSocketDisconnect(conn);
        break;

        case kNotifySocketRead:
            conn = (AuthConn *) *userState;
            result = NotifyAuthConnSocketRead(conn, (AsyncNotifySocketRead *) notify);
        break;
    }
    
    return result;
}

//============================================================================
static bool Recv_File2Cli_ManifestReply (FileConn * conn, const File2Cli_ManifestReply & msg) {

    FileTrans * trans;
    s_critsect.Enter();
    {
        if (nil != (trans = s_fileTrans.Find(msg.transId)))
            s_fileTrans.Unlink(trans);
    }
    s_critsect.Leave();

    if (trans) {
        unsigned replyAtMs = TimeGetMs();
        trans->conn->dump(L"[TCP] Reply from SrvFile. ms=%u", replyAtMs - trans->pingAtMs);
        delete trans;
        return true;
    }
    else {
        return false;
    }
}

//============================================================================
static void FilePingProc (void * param) {

    FileConn * conn = (FileConn *)param;

    while (!conn->done && conn->pingsCompleted < kMaxPings) {

        if (!conn->pingsInRoute) {

            FileTrans * trans = new FileTrans(conn);
            trans->pingAtMs = TimeGetMs();

            s_critsect.Enter();
            for (;;) {
                if (conn->done) {
                    conn->pingsCompleted = kMaxPings;
                    delete trans;
                    break;
                }
                while (++s_transId == 0)
                    NULL_STMT;
                trans->SetValue(s_transId);
                s_fileTrans.Add(trans);

                Cli2File_ManifestRequest msg;
                StrCopy(msg.group, L"External", arrsize(msg.group));
                msg.messageId       = kCli2File_ManifestRequest;
                msg.transId         = trans->GetValue();
                msg.messageBytes    = sizeof(msg);
                msg.buildId         = 0;

                AsyncSocketSend(conn->sock, &msg, sizeof(msg));
                break;
            }
            s_critsect.Leave();
        }
        AsyncSleep(10);
    }

    s_critsect.Enter();
    {   
        conn->done = true;
        AsyncSocketDisconnect(conn->sock, true);
    }
    s_critsect.Leave();
        
    conn->DecRef("Pinging");
}

//============================================================================
static void NotifyFileConnSocketConnect (FileConn * conn) {

    conn->TransferRef("Connecting", "Connected");

    conn->dump(L"[TCP] SrvFile socket established");
    conn->dump(L"[TCP] Pinging SrvFile...");
    conn->IncRef("Pinging");
    _beginthread(FilePingProc, 0, conn);
}

//============================================================================
static void NotifyFileConnSocketConnectFailed (FileConn * conn) {

    conn->error = kNetErrConnectFailed;

    conn->cancelId = 0;
    conn->dump(L"[TCP] SrvFile socket connection failed %u, %s", conn->error, NetErrorToString(conn->error));

    conn->DecRef("Connecting");
}

//============================================================================
static void NotifyFileConnSocketDisconnect (FileConn * conn) {

    if (!conn->done && !conn->error)
        conn->error = kNetErrDisconnected;

    conn->cancelId = 0;
    conn->dump(L"[TCP] SrvFile socket closed: %u, %s", conn->error, NetErrorToString(conn->error));
    
    HASHTABLEDECL(
        FileTrans,
        THashKeyVal<unsigned>,
        link
    ) fileTrans;
    
    s_critsect.Enter();
    {
        conn->done = true;
        while (FileTrans * trans = s_fileTrans.Head())
            fileTrans.Add(trans);
    }
    s_critsect.Leave();
    
    while (FileTrans * trans = fileTrans.Head()) {
        conn->dump(L"[TCP] No reply from SrvFile: %u, %s", conn->error, NetErrorToString(conn->error));
        delete trans;
    }
    
    conn->DecRef("Connected");
}

//============================================================================
static bool NotifyFileConnSocketRead (FileConn * conn, AsyncNotifySocketRead * read) {

    conn->recvBuffer.Add(read->buffer, read->bytes);
    read->bytesProcessed += read->bytes;

    for (;;) {
        if (conn->recvBuffer.Count() < sizeof(uint32_t))
            return true;

        uint32_t msgSize = *(uint32_t *)conn->recvBuffer.Ptr();
        if (conn->recvBuffer.Count() < msgSize)
            return true;

        const Cli2File_MsgHeader * msg = (const Cli2File_MsgHeader *) conn->recvBuffer.Ptr();
        
        if (msg->messageId != kFile2Cli_ManifestReply) {
            conn->dump(L"[TCP] SrvFile received unexpected message. id: %u", msg->messageId);
            return false;
        }
        
        if (!Recv_File2Cli_ManifestReply(conn, *(const File2Cli_ManifestReply *)msg))
            return false;

        conn->recvBuffer.Move(0, msgSize, conn->recvBuffer.Count() - msgSize);
        conn->recvBuffer.ShrinkBy(msgSize);
    }
}

//============================================================================
static bool FileSocketNotifyCallback (
    AsyncSocket         sock,
    EAsyncNotifySocket  code,
    AsyncNotifySocket * notify,
    void **             userState
) {
    bool result = true;
    FileConn * conn;

    switch (code) {
        case kNotifySocketConnectSuccess:
            conn = (FileConn *) notify->param;
            *userState      = conn;
            conn->sock      = sock;
            conn->cancelId  = 0;
            NotifyFileConnSocketConnect(conn);
        break;

        case kNotifySocketConnectFailed:
            conn = (FileConn *) notify->param;
            NotifyFileConnSocketConnectFailed(conn);
        break;

        case kNotifySocketDisconnect:
            conn = (FileConn *) *userState;
            NotifyFileConnSocketDisconnect(conn);
        break;

        case kNotifySocketRead:
            conn = (FileConn *) *userState;
            result = NotifyFileConnSocketRead(conn, (AsyncNotifySocketRead *) notify);
        break;
    }
    
    return result;
}

//============================================================================
static void StartAuthTcpTest (
    NetDiag *               diag,
    const NetAddress &      addr,
    FNetDiagDumpProc        dump,
    FNetDiagTestCallback    callback,
    void *                  param
) {
    if (0 == AtomicSet(&s_authProtocolRegistered, 1)) {
        memset(
            s_payload,
            (uint8_t)((uintptr_t)&s_payload >> 4),
            sizeof(s_payload)
        );
        NetMsgProtocolRegister(
            kNetProtocolCli2Auth,
            false,
            s_send, arrsize(s_send),
            s_recv, arrsize(s_recv),
            kAuthDhGValue,
            BigNum(sizeof(kAuthDhXData), kAuthDhXData),
            BigNum(sizeof(kAuthDhNData), kAuthDhNData)
        );
    }

    wchar_t addrStr[128]; 
    NetAddressToString(addr, addrStr, arrsize(addrStr), kNetAddressFormatAll);
    dump(L"[TCP] Connecting to SrvAuth at %s...", addrStr);

    diag->IncRef("TCP");    
    
    AuthConn * conn = NEWZERO(AuthConn);
    conn->diag      = diag;
    conn->dump      = dump;
    conn->callback  = callback;
    conn->param     = param;
    conn->IncRef("Connecting");

    Cli2Auth_Connect connect;
    connect.hdr.connType    = (uint8_t) kConnTypeCliToAuth;
    connect.hdr.hdrBytes    = sizeof(connect.hdr);
    connect.hdr.buildId     = BuildId();
    connect.hdr.buildType   = BUILD_TYPE_LIVE;
    connect.hdr.branchId    = BranchId();
    connect.hdr.productId   = ProductId();
    connect.data.token      = kNilGuid;
    connect.data.dataBytes  = sizeof(connect.data);

    AsyncSocketConnect(
        &conn->cancelId,
        addr,
        AuthSocketNotifyCallback,
        conn,
        &connect,
        sizeof(connect),
        0,
        0
    );
}

//============================================================================
static void StartFileTcpTest (
    NetDiag *               diag,
    const NetAddress &      addr,
    FNetDiagDumpProc        dump,
    FNetDiagTestCallback    callback,
    void *                  param
) {
    wchar_t addrStr[128]; 
    NetAddressToString(addr, addrStr, arrsize(addrStr), kNetAddressFormatAll);
    dump(L"[TCP] Connecting to SrvFile at %s...", addrStr);

    diag->IncRef("TCP");    

    FileConn * conn = NEWZERO(FileConn);
    conn->diag      = diag;
    conn->dump      = dump;
    conn->callback  = callback;
    conn->param     = param;
    conn->IncRef("Connecting");

    Cli2File_Connect connect;
    connect.hdr.connType    = kConnTypeCliToFile;
    connect.hdr.hdrBytes    = sizeof(connect.hdr);
    connect.hdr.buildId     = 0;
    connect.hdr.buildType   = BUILD_TYPE_LIVE;
    connect.hdr.branchId    = BranchId();
    connect.hdr.productId   = ProductId();
    connect.data.buildId    = BuildId();
    connect.data.serverType = kSrvTypeNone;
    connect.data.dataBytes  = sizeof(connect.data);

    AsyncSocketConnect(
        &conn->cancelId,
        addr,
        FileSocketNotifyCallback,
        conn,
        &connect,
        sizeof(connect),
        0,
        0
    );
    
}


/*****************************************************************************
*
*   AuthConn
*
***/

//============================================================================
AuthConn::~AuthConn () {
    if (cli)
        NetCliDelete(cli, false);
    if (sock)
        AsyncSocketDelete(sock);
    callback(diag, kNetProtocolCli2Auth, error, param);
    diag->DecRef("TCP");
}


/*****************************************************************************
*
*   AuthTrans
*
***/

//============================================================================
AuthTrans::AuthTrans (AuthConn * conn)
:   conn(conn)
{
    conn->IncRef("Ping");
    AtomicAdd(&conn->pingsInRoute, 1);
}

//============================================================================
AuthTrans::~AuthTrans () {

    AtomicAdd(&conn->pingsCompleted, 1);
    AtomicAdd(&conn->pingsInRoute, -1);
    conn->DecRef("Ping");
}


/*****************************************************************************
*
*   FileConn
*
***/

//============================================================================
FileConn::~FileConn () {
    if (sock)
        AsyncSocketDelete(sock);
    callback(diag, kNetProtocolCli2File, error, param);
    diag->DecRef("TCP");
}


/*****************************************************************************
*
*   FileTrans
*
***/

//============================================================================
FileTrans::FileTrans (FileConn * conn)
:   conn(conn)
{
    conn->IncRef("Ping");
    AtomicAdd(&conn->pingsInRoute, 1);
}

//============================================================================
FileTrans::~FileTrans () {

    AtomicAdd(&conn->pingsCompleted, 1);
    AtomicAdd(&conn->pingsInRoute, -1);
    conn->DecRef("Ping");
}


/*****************************************************************************
*
*   Module functions
*
***/

//============================================================================
void TcpStartup () {

    s_shutdown = false;
    AsyncTimerCreate(&s_timer, TimerCallback, 0, nil);
}

//============================================================================
void TcpShutdown () {

    s_shutdown = true;
    AsyncTimerDeleteCallback(s_timer, TimerCallback);
    s_timer = nil;
}


/*****************************************************************************
*
*   Exports
*
***/

//============================================================================
void NetDiagTcp (
    NetDiag *               diag,
    ENetProtocol            protocol,
    unsigned                port,
    FNetDiagDumpProc        dump,
    FNetDiagTestCallback    callback,
    void *                  param
) {
    ASSERT(diag);
    ASSERT(dump);
    ASSERT(callback);

    unsigned srv = NetProtocolToSrv(protocol);
    if (srv == kNumDiagSrvs) {
        dump(L"[TCP] Unsupported protocol: %s", NetProtocolToString(protocol));
        callback(diag, protocol, kNetErrNotSupported, param);
        return;
    }

    unsigned    node;   
    NetAddress  addr;
    diag->critsect.Enter();
    {
        node = diag->nodes[srv];
    }
    diag->critsect.Leave();

    if (!node) {
        dump(L"[TCP] No address set for protocol: %s", NetProtocolToString(protocol));
        callback(diag, protocol, kNetSuccess, param);
        return;
    }

    NetAddressFromNode(node, port, &addr);
    
    switch (protocol) {
        case kNetProtocolCli2Auth:
            StartAuthTcpTest(diag, addr, dump, callback, param);
        break;
        
        case kNetProtocolCli2File:
            StartFileTcpTest(diag, addr, dump, callback, param);
        break;
        
        DEFAULT_FATAL(protocol);
    }
}