/*
  ==============================================================================

   This file is part of the JUCE library - "Jules' Utility Class Extensions"
   Copyright 2004-10 by Raw Material Software Ltd.

  ------------------------------------------------------------------------------

   JUCE can be redistributed and/or modified under the terms of the GNU General
   Public License (Version 2), as published by the Free Software Foundation.
   A copy of the license is included in the JUCE distribution, or can be found
   online at www.gnu.org/licenses.

   JUCE 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.

  ------------------------------------------------------------------------------

   To release a closed-source product which uses JUCE, commercial licenses are
   available: visit www.rawmaterialsoftware.com/juce for more information.

  ==============================================================================
*/

#include "../../core/juce_TargetPlatform.h"

#if JUCE_WINDOWS
  #include <winsock2.h>

  #ifdef _MSC_VER
    #pragma warning (disable : 4127 4389 4018)
  #endif

#else
  #if JUCE_LINUX
    #include <sys/types.h>
    #include <sys/socket.h>
    #include <sys/errno.h>
    #include <unistd.h>
    #include <netinet/in.h>
  #elif (MACOSX_DEPLOYMENT_TARGET <= MAC_OS_X_VERSION_10_4) && ! JUCE_IPHONE
    #include <CoreServices/CoreServices.h>
  #endif

  #include <fcntl.h>
  #include <netdb.h>
  #include <arpa/inet.h>
  #include <netinet/tcp.h>
#endif

#include "../../core/juce_StandardHeader.h"

BEGIN_JUCE_NAMESPACE

#include "juce_Socket.h"
#include "../../threads/juce_ScopedLock.h"
#include "../../threads/juce_Thread.h"

#if defined (JUCE_LINUX) || defined (JUCE_MAC) || defined (JUCE_IPHONE)
 typedef socklen_t juce_socklen_t;
#else
 typedef int juce_socklen_t;
#endif


//==============================================================================
#if JUCE_WINDOWS

typedef int (__stdcall juce_CloseWin32SocketLibCall) (void);
juce_CloseWin32SocketLibCall* juce_CloseWin32SocketLib = 0;

static void initWin32Sockets()
{
    static CriticalSection lock;
    const ScopedLock sl (lock);

    if (juce_CloseWin32SocketLib == 0)
    {
        WSADATA wsaData;
        const WORD wVersionRequested = MAKEWORD (1, 1);
        WSAStartup (wVersionRequested, &wsaData);

        juce_CloseWin32SocketLib = &WSACleanup;
    }
}

#endif

//==============================================================================
static bool resetSocketOptions (const int handle, const bool isDatagram, const bool allowBroadcast) throw()
{
    const int sndBufSize = 65536;
    const int rcvBufSize = 65536;
    const int one = 1;

    return handle > 0
            && setsockopt (handle, SOL_SOCKET, SO_RCVBUF, (const char*) &rcvBufSize, sizeof (rcvBufSize)) == 0
            && setsockopt (handle, SOL_SOCKET, SO_SNDBUF, (const char*) &sndBufSize, sizeof (sndBufSize)) == 0
            && (isDatagram ? ((! allowBroadcast) || setsockopt (handle, SOL_SOCKET, SO_BROADCAST, (const char*) &one, sizeof (one)) == 0)
                           : (setsockopt (handle, IPPROTO_TCP, TCP_NODELAY, (const char*) &one, sizeof (one)) == 0));
}

static bool bindSocketToPort (const int handle, const int port) throw()
{
    if (handle <= 0 || port <= 0)
        return false;

    struct sockaddr_in servTmpAddr;
    zerostruct (servTmpAddr);
    servTmpAddr.sin_family = PF_INET;
    servTmpAddr.sin_addr.s_addr = htonl (INADDR_ANY);
    servTmpAddr.sin_port = htons ((uint16) port);

    return bind (handle, (struct sockaddr*) &servTmpAddr, sizeof (struct sockaddr_in)) >= 0;
}

static int readSocket (const int handle,
                       void* const destBuffer, const int maxBytesToRead,
                       bool volatile& connected,
                       const bool blockUntilSpecifiedAmountHasArrived) throw()
{
    int bytesRead = 0;

    while (bytesRead < maxBytesToRead)
    {
        int bytesThisTime;

#if JUCE_WINDOWS
        bytesThisTime = recv (handle, ((char*) destBuffer) + bytesRead, maxBytesToRead - bytesRead, 0);
#else
        while ((bytesThisTime = (int) ::read (handle, ((char*) destBuffer) + bytesRead, maxBytesToRead - bytesRead)) < 0
                 && errno == EINTR
                 && connected)
        {
        }
#endif

        if (bytesThisTime <= 0 || ! connected)
        {
            if (bytesRead == 0)
                bytesRead = -1;

            break;
        }

        bytesRead += bytesThisTime;

        if (! blockUntilSpecifiedAmountHasArrived)
            break;
    }

    return bytesRead;
}

static int waitForReadiness (const int handle, const bool forReading,
                             const int timeoutMsecs) throw()
{
    struct timeval timeout;
    struct timeval* timeoutp;

    if (timeoutMsecs >= 0)
    {
        timeout.tv_sec = timeoutMsecs / 1000;
        timeout.tv_usec = (timeoutMsecs % 1000) * 1000;
        timeoutp = &timeout;
    }
    else
    {
        timeoutp = 0;
    }

    fd_set rset, wset;
    FD_ZERO (&rset);
    FD_SET (handle, &rset);
    FD_ZERO (&wset);
    FD_SET (handle, &wset);

    fd_set* const prset = forReading ? &rset : 0;
    fd_set* const pwset = forReading ? 0 : &wset;

#if JUCE_WINDOWS
    if (select (handle + 1, prset, pwset, 0, timeoutp) < 0)
        return -1;
#else
    {
        int result;
        while ((result = select (handle + 1, prset, pwset, 0, timeoutp)) < 0
                && errno == EINTR)
        {
        }

        if (result < 0)
            return -1;
    }
#endif

    {
        int opt;
        juce_socklen_t len = sizeof (opt);

        if (getsockopt (handle, SOL_SOCKET, SO_ERROR, (char*) &opt, &len) < 0
             || opt != 0)
            return -1;
    }

    if ((forReading && FD_ISSET (handle, &rset))
         || ((! forReading) && FD_ISSET (handle, &wset)))
        return 1;

    return 0;
}

static bool setSocketBlockingState (const int handle, const bool shouldBlock) throw()
{
#if JUCE_WINDOWS
    u_long nonBlocking = shouldBlock ? 0 : 1;

    if (ioctlsocket (handle, FIONBIO, &nonBlocking) != 0)
        return false;
#else
    int socketFlags = fcntl (handle, F_GETFL, 0);

    if (socketFlags == -1)
        return false;

    if (shouldBlock)
        socketFlags &= ~O_NONBLOCK;
    else
        socketFlags |= O_NONBLOCK;

    if (fcntl (handle, F_SETFL, socketFlags) != 0)
        return false;
#endif

    return true;
}

static bool connectSocket (int volatile& handle,
                           const bool isDatagram,
                           void** serverAddress,
                           const String& hostName,
                           const int portNumber,
                           const int timeOutMillisecs) throw()
{
    struct hostent* const hostEnt = gethostbyname (hostName.toUTF8());

    if (hostEnt == 0)
        return false;

    struct in_addr targetAddress;
    memcpy (&targetAddress.s_addr,
            *(hostEnt->h_addr_list),
            sizeof (targetAddress.s_addr));

    struct sockaddr_in servTmpAddr;
    zerostruct (servTmpAddr);
    servTmpAddr.sin_family = PF_INET;
    servTmpAddr.sin_addr = targetAddress;
    servTmpAddr.sin_port = htons ((uint16) portNumber);

    if (handle < 0)
        handle = (int) socket (AF_INET, isDatagram ? SOCK_DGRAM : SOCK_STREAM, 0);

    if (handle < 0)
        return false;

    if (isDatagram)
    {
        *serverAddress = new struct sockaddr_in();
        *((struct sockaddr_in*) *serverAddress) = servTmpAddr;

        return true;
    }

    setSocketBlockingState (handle, false);

    const int result = ::connect (handle, (struct sockaddr*) &servTmpAddr, sizeof (struct sockaddr_in));

    if (result < 0)
    {
#if JUCE_WINDOWS
        if (result == SOCKET_ERROR && WSAGetLastError() == WSAEWOULDBLOCK)
#else
        if (errno == EINPROGRESS)
#endif
        {
            if (waitForReadiness (handle, false, timeOutMillisecs) != 1)
            {
                setSocketBlockingState (handle, true);
                return false;
            }
        }
    }

    setSocketBlockingState (handle, true);
    resetSocketOptions (handle, false, false);

    return true;
}

//==============================================================================
StreamingSocket::StreamingSocket()
    : portNumber (0),
      handle (-1),
      connected (false),
      isListener (false)
{
#if JUCE_WINDOWS
    initWin32Sockets();
#endif
}

StreamingSocket::StreamingSocket (const String& hostName_,
                                  const int portNumber_,
                                  const int handle_)
    : hostName (hostName_),
      portNumber (portNumber_),
      handle (handle_),
      connected (true),
      isListener (false)
{
#if JUCE_WINDOWS
    initWin32Sockets();
#endif

    resetSocketOptions (handle_, false, false);
}

StreamingSocket::~StreamingSocket()
{
    close();
}

//==============================================================================
int StreamingSocket::read (void* destBuffer, const int maxBytesToRead, const bool blockUntilSpecifiedAmountHasArrived)
{
    return (connected && ! isListener) ? readSocket (handle, destBuffer, maxBytesToRead, connected, blockUntilSpecifiedAmountHasArrived)
                                       : -1;
}

int StreamingSocket::write (const void* sourceBuffer, const int numBytesToWrite)
{
    if (isListener || ! connected)
        return -1;

#if JUCE_WINDOWS
    return send (handle, (const char*) sourceBuffer, numBytesToWrite, 0);
#else
    int result;

    while ((result = (int) ::write (handle, sourceBuffer, numBytesToWrite)) < 0
            && errno == EINTR)
    {
    }

    return result;
#endif
}

//==============================================================================
int StreamingSocket::waitUntilReady (const bool readyForReading,
                                     const int timeoutMsecs) const
{
    return connected ? waitForReadiness (handle, readyForReading, timeoutMsecs)
                     : -1;
}

//==============================================================================
bool StreamingSocket::bindToPort (const int port)
{
    return bindSocketToPort (handle, port);
}

bool StreamingSocket::connect (const String& remoteHostName,
                               const int remotePortNumber,
                               const int timeOutMillisecs)
{
    if (isListener)
    {
        jassertfalse    // a listener socket can't connect to another one!
        return false;
    }

    if (connected)
        close();

    hostName = remoteHostName;
    portNumber = remotePortNumber;
    isListener = false;

    connected = connectSocket (handle, false, 0, remoteHostName,
                               remotePortNumber, timeOutMillisecs);

    if (! (connected && resetSocketOptions (handle, false, false)))
    {
        close();
        return false;
    }

    return true;
}

void StreamingSocket::close()
{
#if JUCE_WINDOWS
    if (handle != SOCKET_ERROR || connected)
        closesocket (handle);

    connected = false;
#else
    if (connected)
    {
        connected = false;

        if (isListener)
        {
            // need to do this to interrupt the accept() function..
            StreamingSocket temp;
            temp.connect ("localhost", portNumber, 1000);
        }
    }

    if (handle != -1)
        ::close (handle);
#endif

    hostName = String::empty;
    portNumber = 0;
    handle = -1;
    isListener = false;
}

//==============================================================================
bool StreamingSocket::createListener (const int newPortNumber, const String& localHostName)
{
    if (connected)
        close();

    hostName = "listener";
    portNumber = newPortNumber;
    isListener = true;

    struct sockaddr_in servTmpAddr;
    zerostruct (servTmpAddr);
    servTmpAddr.sin_family = PF_INET;
    servTmpAddr.sin_addr.s_addr = htonl (INADDR_ANY);

    if (localHostName.isNotEmpty())
        servTmpAddr.sin_addr.s_addr = ::inet_addr (localHostName.toUTF8());

    servTmpAddr.sin_port = htons ((uint16) portNumber);

    handle = (int) socket (AF_INET, SOCK_STREAM, 0);

    if (handle < 0)
        return false;

    const int reuse = 1;
    setsockopt (handle, SOL_SOCKET, SO_REUSEADDR, (const char*) &reuse, sizeof (reuse));

    if (bind (handle, (struct sockaddr*) &servTmpAddr, sizeof (struct sockaddr_in)) < 0
         || listen (handle, SOMAXCONN) < 0)
    {
        close();
        return false;
    }

    connected = true;
    return true;
}

StreamingSocket* StreamingSocket::waitForNextConnection() const
{
    jassert (isListener || ! connected); // to call this method, you first have to use createListener() to
                                         // prepare this socket as a listener.

    if (connected && isListener)
    {
        struct sockaddr address;
        juce_socklen_t len = sizeof (sockaddr);
        const int newSocket = (int) accept (handle, &address, &len);

        if (newSocket >= 0 && connected)
            return new StreamingSocket (inet_ntoa (((struct sockaddr_in*) &address)->sin_addr),
                                        portNumber, newSocket);
    }

    return 0;
}

bool StreamingSocket::isLocal() const throw()
{
    return hostName == "127.0.0.1";
}


//==============================================================================
//==============================================================================
DatagramSocket::DatagramSocket (const int localPortNumber, const bool allowBroadcast_)
    : portNumber (0),
      handle (-1),
      connected (true),
      allowBroadcast (allowBroadcast_),
      serverAddress (0)
{
#if JUCE_WINDOWS
    initWin32Sockets();
#endif

    handle = (int) socket (AF_INET, SOCK_DGRAM, 0);
    bindToPort (localPortNumber);
}

DatagramSocket::DatagramSocket (const String& hostName_, const int portNumber_,
                                const int handle_, const int localPortNumber)
    : hostName (hostName_),
      portNumber (portNumber_),
      handle (handle_),
      connected (true),
      allowBroadcast (false),
      serverAddress (0)
{
#if JUCE_WINDOWS
    initWin32Sockets();
#endif

    resetSocketOptions (handle_, true, allowBroadcast);
    bindToPort (localPortNumber);
}

DatagramSocket::~DatagramSocket()
{
    close();

    delete ((struct sockaddr_in*) serverAddress);
    serverAddress = 0;
}

void DatagramSocket::close()
{
#if JUCE_WINDOWS
    closesocket (handle);
    connected = false;
#else
    connected = false;
    ::close (handle);
#endif

    hostName = String::empty;
    portNumber = 0;
    handle = -1;
}

bool DatagramSocket::bindToPort (const int port)
{
    return bindSocketToPort (handle, port);
}

bool DatagramSocket::connect (const String& remoteHostName,
                              const int remotePortNumber,
                              const int timeOutMillisecs)
{
    if (connected)
        close();

    hostName = remoteHostName;
    portNumber = remotePortNumber;

    connected = connectSocket (handle, true, &serverAddress,
                               remoteHostName, remotePortNumber,
                               timeOutMillisecs);

    if (! (connected && resetSocketOptions (handle, true, allowBroadcast)))
    {
        close();
        return false;
    }

    return true;
}

DatagramSocket* DatagramSocket::waitForNextConnection() const
{
    struct sockaddr address;
    juce_socklen_t len = sizeof (sockaddr);

    while (waitUntilReady (true, -1) == 1)
    {
        char buf[1];

        if (recvfrom (handle, buf, 0, 0, &address, &len) > 0)
        {
            return new DatagramSocket (inet_ntoa (((struct sockaddr_in*) &address)->sin_addr),
                                       ntohs (((struct sockaddr_in*) &address)->sin_port),
                                       -1, -1);
        }
    }

    return 0;
}

//==============================================================================
int DatagramSocket::waitUntilReady (const bool readyForReading,
                                    const int timeoutMsecs) const
{
    return connected ? waitForReadiness (handle, readyForReading, timeoutMsecs)
                     : -1;
}

int DatagramSocket::read (void* destBuffer, const int maxBytesToRead, const bool blockUntilSpecifiedAmountHasArrived)
{
    return connected ? readSocket (handle, destBuffer, maxBytesToRead, connected, blockUntilSpecifiedAmountHasArrived)
                     : -1;
}

int DatagramSocket::write (const void* sourceBuffer, const int numBytesToWrite)
{
    // You need to call connect() first to set the server address..
    jassert (serverAddress != 0 && connected);

    return connected ? (int) sendto (handle, (const char*) sourceBuffer,
                                     numBytesToWrite, 0,
                                     (const struct sockaddr*) serverAddress,
                                     sizeof (struct sockaddr_in))
                     : -1;
}

bool DatagramSocket::isLocal() const throw()
{
    return hostName == "127.0.0.1";
}


END_JUCE_NAMESPACE
