#include "MTcpIpIO.h"

#include <unistd.h>    // usleep

#include <errno.h>

#include <TSocket.h>
#include <TServerSocket.h>

#include "MLog.h"
#include "MLogManip.h"

#include "MString.h"
#include "MTimeout.h"

#undef DEBUG

using namespace std;

    /*
     enum ESockOptions {
     kSendBuffer,        // size of send buffer
     kRecvBuffer,        // size of receive buffer
     kOobInline,         // OOB message inline
     kKeepAlive,         // keep socket alive
     kReuseAddr,         // allow reuse of local portion of address 5-tuple
     kNoDelay,           // send without delay
     kNoBlock,           // non-blocking I/O
     kProcessGroup,      // socket process group (used for SIGURG and SIGIO)
     kAtMark,            // are we at out-of-band mark (read only)
     kBytesToRead        // get number of bytes to read, FIONREAD (read only)
     };

     enum ESendRecvOptions {
     kDefault,           // default option (= 0)
     kOob,               // send or receive out-of-band data
     kPeek,              // peek at incoming message (receive only)
     kDontBlock          // send/recv as much data as possible without blocking
     };
     */

MTcpIpO::MTcpIpO(const char *addr, Int_t tx) : fPortTx(tx)
{
    // was "inf2" but nobody knows what the prg is doing if it times out
    gLog << all << "- Open send socket to " << addr << ":" << tx << endl;

    const Int_t save = gDebug;
    gDebug=1;
    fTxSocket = new TSocket(addr, tx);
    gDebug=save;
    fTxSocket->SetOption(kNoBlock, 1);

    MTcpIpO::RunThread();
}

MTcpIpO::~MTcpIpO()
{
    CancelThread();

    // Now delete all TCP/IP objects
    delete fTxSocket;
}

MTcpIpIO::MTcpIpIO(const char *addr, Int_t tx, Int_t rx) : MTcpIpI(rx), MTcpIpO(addr, tx)
{
    MTcpIpI::RunThread();
}

MTcpIpIO::~MTcpIpIO()
{
}

TString MTcpIpO::GetSocketAddress(const TSocket &s)
{
    if (!s.IsValid())
        return "n/a";

    const TInetAddress &a = s.GetInetAddress();
    if (!a.IsValid())
        return "undefined";

    return MString::Format("%s:%d", a.GetHostAddress(), a.GetPort());
}

/*
TString MTcpIpO::GetSocketAddress() const
{
    TLockGuard guard(const_cast<TMutex*>(&fMutex));
    return GetSocketAddress(*fTxSocket);
}
*/
bool MTcpIpO::SendFrame(TSocket &tx, const char *msg, int len)
{
    if (!tx.IsValid())
        return false;

#ifdef DEBUG
    cout << "Tx: " << msg << flush;
#endif

    const Int_t l = tx.SendRaw(msg, len, kDontBlock);

    // Frame not sent, EWOULDBLOCK
    if (l==-4)
    {
        gLog << err << "ERROR - Sending to " << GetSocketAddress(tx) << " would block." << endl;
/*--->*/        tx.Close(); // ?????
        return false;
    }

    if (l<0)
    {
        gLog << err << "ERROR - Sending TCP/IP frame to " << GetSocketAddress(tx) << endl;
        return false;
    }

    if (l!=len)
    {
        gLog << err << "ERROR - Could only sent " << l << " out of "  << len << " bytes to " << GetSocketAddress(tx) << endl;
        return false;
    }

    return true;
}

bool MTcpIpO::SendFrame(const char *addr, int port, const char *msg, int len)
{
#ifdef DEBUG
    cout << "Connecting to " << addr << ":" << port << endl;
#endif

    // FIXME: Set tx-socket to nonblocking?
    TSocket tx(addr, port);
    return SendFrame(tx, msg, len);
}

bool MTcpIpO::Send(const char *msg, Int_t len)
{
    const Int_t mtx = fMutex.TryLock();
    if (mtx==13)
        gLog << warn << "MTcpIpO::Send - mutex is already locked by this thread." << endl;

    // If Mutex cannot be locked, i.e. we are currently reopening
    // the send socket we cannot wait, because we would block the
    // executing threrad.
    if (mtx)
        return false;

    const bool rc = SendFrame(*fTxSocket, msg, len);

    fMutex.UnLock();

    return rc;
}

Int_t MTcpIpO::Thread()
{
    const TInetAddress &a = fTxSocket->GetInetAddress();
    if (!a.IsValid())
    {
        gLog << err << "ERROR: Send socket address invalid." << endl;
        return 0;
    }

    Int_t wait = 1000; /// Wait a ms

    while (!IsThreadCanceled())
    {
        if (fTxSocket->IsValid())
        {
            MThread::Sleep(1000); // Wait a ms
            wait = 1000;
            continue;
        }


#ifdef DEBUG
        cout << "- Reopen send socket to " << a.GetHostAddress() << ":" << fPortTx << endl;
#endif

        fMutex.Lock();

        delete fTxSocket;

        fTxSocket = new TSocket(a.GetHostAddress(), fPortTx);
        fTxSocket->SetOption(kNoBlock, 1);

        fMutex.UnLock();

        if (fTxSocket->IsValid())
            continue;

        MThread::Sleep(wait); // Wait a ms
        if (wait<30000000) // 30s
            wait *= 2;
    }

    return 1;
}

bool MTcpIpIO::InterpreteStr(TString str)
{
    cout << "Rx: " << str << flush;
    return true;
}

Bool_t MTcpIpIO::ReadSocket(TSocket &rx)
{
    TString str;

    while (!MTcpIpI::IsThreadCanceled())
    {
        char c;
        const Int_t len = rx.RecvRaw(&c, 1);

        // For details see TSocket::RecvRaw
        // -1: // ERROR
        // EINVAL, EWOULDBLOCK
        // -5: // EPIPE || ECONNRESET = Pipe broken or connection reset by peer
        //  0: Data received with zero length! (Connection lost/call interrupted)
        if (len<=0)
            return kFALSE;

        // Data received
        if (len>1)
        {
            cout << "Data too long!!!" << endl;
            break;
        }

        // Data received (len==1)
        if (c!='\n')
        {
            str += c;
            continue;
        }

        // String completed
        InterpreteStr(str);
        str = "";
    }

    return kTRUE;
}

Bool_t MTcpIpI::WaitForData(TSocket &sock)
{
    // No connection established?
    if (!sock.IsValid())
    {
        gLog << warn << "TSocket invalid on port " << fPortRx << "." << endl;
        return kFALSE;
    }

    fConnectionEstablished = kTRUE;

    MTimeout timeout(fTimeout);

    // Get connection on port fPortRx and redirected
    while (!IsThreadCanceled())
    {
        // Check for pending data (every ms)
        switch (sock.Select(TSocket::kRead, 1))
        {
        case kTRUE:  // Data pending... go on reading
            if (!ReadSocket(sock))
            {
                gLog << warn << MTime(-1) << " WARNING - Connection lost to " << MTcpIpO::GetSocketAddress(sock) << endl;
                return kFALSE;
            }
            timeout.Start(fTimeout);

            // Go on waiting for new data
            continue;

        case kFALSE: // Time out, no data yet, go on waiting
            if (timeout.HasTimedOut())
            {
                gLog << warn << MTime(-1) << " WARNING - Connection to " << MTcpIpO::GetSocketAddress(sock) << " timed out after " << fTimeout << "ms." << endl;
                return kFALSE;
            }

            // Go on waiting for new data
            continue;

        default:  // Error occurance
            gLog << err << "TSocket::Select returned an error: " << strerror(errno) << endl;
            return kFALSE;
        }
    }
    return kTRUE; //???
}

void MTcpIpI::WaitForConnection(TServerSocket &server)
{
    while (!IsThreadCanceled())
    {
        gLog << all << MTime(-1) << " Listening for new connection on port " << fPortRx << "..." << endl;

        // Check for a connection request (reminder: we are in non-blocking mode)
        TSocket *socket = 0;

        while (!IsThreadCanceled())
        {
            //cout << (int) IsThreadCanceled() << endl;
            // Wait for a new connection on RX port
            socket = server.Accept();

            // Accept returned an error
            if (socket==0)
            {
                gLog << err << "Error: TServerSock::Accept on port " << fPortRx << ": " << strerror(errno) << endl;
                // Since we don't know the type of the error we better shut down the socket
                return;
            }

            // No connection request pending
            if ((Long_t)socket<0)
            {
                MThread::Sleep(1000); // Wait a ms
                continue;
            }

            // Connection established
            break;
        }

        if ((Long_t)socket<=0)
            return;

        gLog << all << MTime(-1) << " Connection established to " << MTcpIpO::GetSocketAddress(*socket) << "..." << endl;

        if (!WaitForData(*socket))
            fConnectionEstablished = kFALSE;

#ifdef DEBUG
        cout << "===> DEL SOCKET" << endl;
#endif
        delete socket;
    }
}

Int_t MTcpIpI::Thread()
{
    gLog << inf << "- Starting server listening on port " << fPortRx << "..." << endl;

    while (!IsThreadCanceled())
    {
        TServerSocket *server=new TServerSocket(fPortRx, kTRUE, 0);
        server->SetOption(kNoBlock, 1);

        while (!IsThreadCanceled() && server->IsValid())
            WaitForConnection(*server);

        if (!server->IsValid())
        {
            gLog << err << "ServerSocket on port " << fPortRx << " invalid: ";
            switch (server->GetErrorCode())
            {
            case  0: gLog << "No error." << endl; break;
            case -1: gLog << "low level socket() call failed." << endl; break;
            case -2: gLog << "low level bind() call failed." << endl; break;
            case -3: gLog << "low level listen() call failed." << endl; break;
            default: gLog << "Unknown." << endl; break;
            }
        }

#ifdef DEBUG
        cout << "===> DEL SERVER" << endl;
#endif
        delete server;

        MThread::Sleep(5000000);
    }

    gLog << inf << "- Listening server stopped on port " << fPortRx << "." << endl;

    return 0;
}

/*
Int_t MTcpIpI::Thread()
{
    gLog << inf << "- Starting receiver on port " << fPortRx << "..." << endl;

//    if (fPortRx==7404)
//    {
//        gLog << err << "CeCo communication skipped." << endl;
//        return 0;
//    }

    TServerSocket *fServSock=NULL;
    TSocket       *fRxSocket=NULL;

//    while (!HasStopFlag())
    while (!IsThreadCanceled())
    {
        fServSock=new TServerSocket(fPortRx, kTRUE);
        if (!fServSock->IsValid())
        {
            gLog << err << "ServerSocket on port " << fPortRx << " invalid: ";
            switch (fServSock->GetErrorCode())
            {
            case  0: gLog << "No error." << endl; break;
            case -1: gLog << "low level socket() call failed." << endl; break;
            case -2: gLog << "low level bind() call failed." << endl; break;
            case -3: gLog << "low level listen() call failed." << endl; break;
            default: gLog << "Unknown." << endl; break;
            }
            delete fServSock;
            fServSock=NULL;
            MThread::Sleep(5000000);
            continue;
        }

        fServSock->SetOption(kNoBlock, 1);

        gLog << all << "Waiting for connection on port " << fPortRx << "..." << endl;
//        while (!HasStopFlag() && (Long_t)fRxSocket<=0)
        while (!IsThreadCanceled() && (Long_t)fRxSocket<=0)
        {
            //TThread::CancelPoint();

            fRxSocket = fServSock->Accept();
            if (fRxSocket==0)
                cout << "Error: TServerSock::Accept on port " << fPortRx << "." << endl;
            usleep(10);
        }

        // Can happen in case of HasStopFlag()
        if (fRxSocket==(void*)-1)
            fRxSocket=NULL;

        if (fRxSocket==NULL)
        {
            delete fServSock;
            fServSock=NULL;
            continue;
        }

        if (!fRxSocket->IsValid())
        {
            cout << "TSocket invalid on port " << fPortRx << "." << endl;
            delete fServSock;
            delete fRxSocket;
            fServSock = NULL;
            fRxSocket = NULL;
            continue;
        }

        gLog << all << "Connection established on port " << fPortRx << "." << endl;


        //fRxSocket->SetOption(kNoBlock, 1);

        // Waqit for data
        while (!IsThreadCanceled())
        {
            switch (fRxSocket->Select(kRead, 1))
            {
            case kTRUE:  // Data waiting to be read
                break;
            case kFALSE: // time out
                usleep(10);
                continue;
            }

            // ERROR
            cout << "Error: TRxSocket::Select on port " << fPortRx << "." << endl;

            delete fServSock;
            delete fRxSocket;
            fServSock = NULL;
            fRxSocket = NULL;
            break;
        }¨

        if (!fServSock)
            continue;

        if (IsThreadCanceled())
        {
            delete fServSock;
            delete fRxSocket;
            fServSock = NULL;
            fRxSocket = NULL;
            continue;
        }

        // ------ IDENTICAL UP TO HERE ------

        // Read and evaluate data
        ReadSocket(*fRxSocket);

        delete fServSock;
        delete fRxSocket;
        fServSock = NULL;
        fRxSocket = NULL;
    }

    gLog << inf << "- Receiver stopped on port " << fPortRx << "." << endl;

    return 0;
//    return NULL;
}*/
