/*==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/pnAsyncCoreExe/pnAceIo.cpp
*   
***/

#include "Pch.h"
#pragma hdrstop


/****************************************************************************
*
*   ISocketConnHash
*
***/

// socket notification procedures

// connection data format:
//      uint8_t    connType;
//      uint32_t   buildId;    [optional]
//      uint32_t   branchId;   [optional]
//      uint32_t   buildType;  [optional]
//      Uuid    productId;  [optional]
const unsigned kConnHashFlagsIgnore     = 0x01;
const unsigned kConnHashFlagsExactMatch = 0x02;
struct ISocketConnHash {
    unsigned    connType;
    unsigned    buildId;
    unsigned    buildType;
    unsigned    branchId;
    Uuid        productId;
    unsigned    flags;

    unsigned GetHash () const;
    bool operator== (const ISocketConnHash & rhs) const;
};

struct ISocketConnType : ISocketConnHash {
    HASHLINK(ISocketConnType)   hashlink;
    FAsyncNotifySocketProc      notifyProc;
};


static CLock s_notifyProcLock;
static HASHTABLEDECL(
    ISocketConnType,
    ISocketConnHash,
    hashlink
) s_notifyProcs;


//===========================================================================
unsigned ISocketConnHash::GetHash () const {
    CHashValue hash;
    hash.Hash32(connType);
/*
    if (buildId)
        hash.Hash32(buildId);
    if (buildType)
        hash.Hash32(buildType);
    if (branchId)
        hash.Hash32(branchId);
    if (productId != kNilGuid)
        hash.Hash(&productId, sizeof(productId));
*/
    return hash.GetHash();
}

//===========================================================================
bool ISocketConnHash::operator== (const ISocketConnHash & rhs) const {
    ASSERT(flags & kConnHashFlagsIgnore);

    for (;;) {
        // Check connType
        if (connType != rhs.connType)
            break;

        // Check buildId
        if (buildId != rhs.buildId) {
            if (rhs.flags & kConnHashFlagsExactMatch)
                break;
            if (buildId)
                break;
        }

        // Check buildType
        if (buildType != rhs.buildType) {
            if (rhs.flags & kConnHashFlagsExactMatch)
                break;
            if (buildType)
                break;
        }

        // Check branchId
        if (branchId != rhs.branchId) {
            if (rhs.flags & kConnHashFlagsExactMatch)
                break;
            if (branchId)
                break;
        }

        // Check productId
        if (productId != rhs.productId) {
            if (rhs.flags & kConnHashFlagsExactMatch)
                break;
            if (productId != kNilGuid)
                break;
        }

        // Success!
        return true;
    }

    // Failed!
    return false;
}

//===========================================================================
static unsigned GetConnHash (
    ISocketConnHash *   hash,
    const uint8_t          buffer[],
    unsigned            bytes
) {
    if (!bytes)
        return 0;

    if (IS_TEXT_CONNTYPE(buffer[0])) {
        hash->connType  = buffer[0];
        hash->buildId   = 0;
        hash->buildType = 0;
        hash->branchId  = 0;
        hash->productId = 0;
        hash->flags     = 0;

        // one uint8_t consumed
        return 1;
    }
    else {
        if (bytes < sizeof(AsyncSocketConnectPacket))
            return 0;

        const AsyncSocketConnectPacket & connect = * (const AsyncSocketConnectPacket *) buffer;
        if (connect.hdrBytes < sizeof(connect))
            return 0;
        
        hash->connType  = connect.connType;
        hash->buildId   = connect.buildId;
        hash->buildType = connect.buildType;
        hash->branchId  = connect.branchId;
        hash->productId = connect.productId;
        hash->flags     = 0;

        return connect.hdrBytes;
    }
}


/****************************************************************************
*
*   Public exports
*
***/

//===========================================================================
EFileError AsyncGetLastFileError () {
    const unsigned error = GetLastError();
    switch (error) {

        case NO_ERROR:
        return kFileSuccess;

        case ERROR_FILE_NOT_FOUND:
        return kFileErrorFileNotFound;

        case ERROR_ACCESS_DENIED:
        case ERROR_FILE_EXISTS:
        case ERROR_ALREADY_EXISTS:
        return kFileErrorAccessDenied;

        case ERROR_SHARING_VIOLATION:
        return kFileErrorSharingViolation;

        case ERROR_BAD_NETPATH:
        case ERROR_PATH_NOT_FOUND:
        case ERROR_INVALID_NAME:
        case ERROR_BAD_NET_NAME:
        case ERROR_CANT_ACCESS_DOMAIN_INFO:
        case ERROR_NETWORK_UNREACHABLE:
        case ERROR_HOST_UNREACHABLE:
        return kFileErrorPathNotFound;
    }

    LogMsg(kLogPerf, "Unexpected Win32 error [%#x]", error);

    return kFileErrorPathNotFound;
}

//============================================================================
const wchar_t * FileErrorToString (EFileError error) {
    
    static wchar_t * s_fileErrorStrings[] = {
        L"FileSuccess",
        L"FileErrorInvalidParameter",
        L"FileErrorFileNotFound",
        L"FileErrorPathNotFound",
        L"FileErrorAccessDenied",
        L"FileErrorSharingViolation",
    };
    COMPILER_ASSERT(kNumFileErrors == arrsize(s_fileErrorStrings));
    
    return s_fileErrorStrings[error];
}

//============================================================================
AsyncFile AsyncFileOpen (
    const wchar_t             fullPath[],
    FAsyncNotifyFileProc    notifyProc,
    EFileError *            error,
    unsigned                desiredAccess,
    unsigned                openMode,
    unsigned                shareModeFlags,
    void *                  userState,
    uint64_t *                 fileSize,
    uint64_t *                 fileLastWriteTime
) {
    ASSERT(g_api.fileOpen);
    return g_api.fileOpen(
        fullPath,
        notifyProc,
        error,
        desiredAccess,
        openMode,
        shareModeFlags,
        userState,
        fileSize,
        fileLastWriteTime
    );
}

//============================================================================
void AsyncFileClose (
    AsyncFile   file,
    uint64_t       truncateSize
) {
    ASSERT(g_api.fileClose);
    g_api.fileClose(file, truncateSize);
}

//============================================================================
void AsyncFileSetLastWriteTime (
    AsyncFile   file,
    uint64_t       lastWriteTime
) {
    ASSERT(g_api.fileSetLastWriteTime);
    g_api.fileSetLastWriteTime(file, lastWriteTime);
}

//============================================================================
uint64_t AsyncFileGetLastWriteTime (
    const wchar_t fileName[]
) {
    ASSERT(g_api.fileGetLastWriteTime);
    return g_api.fileGetLastWriteTime(fileName);
}

//============================================================================
AsyncId AsyncFileFlushBuffers (
    AsyncFile   file, 
    uint64_t       truncateSize,
    bool        notify,
    void *      param
) {
    ASSERT(g_api.fileFlushBuffers);
    return g_api.fileFlushBuffers(file, truncateSize, notify, param);
}

//============================================================================
AsyncId AsyncFileRead (
    AsyncFile       file,
    uint64_t           offset,
    void *          buffer,
    unsigned        bytes,
    unsigned        flags,
    void *          param
) {
    ASSERT(g_api.fileRead);
    return g_api.fileRead(
        file,
        offset,
        buffer,
        bytes,
        flags,
        param
    );
}

//============================================================================
AsyncId AsyncFileWrite (
    AsyncFile       file,
    uint64_t           offset,
    const void *    buffer,
    unsigned        bytes,
    unsigned        flags,
    void *          param
) {
    ASSERT(g_api.fileWrite);
    return g_api.fileWrite(
        file,
        offset,
        buffer,
        bytes,
        flags,
        param
    );
}

//============================================================================
AsyncId AsyncFileCreateSequence (
    AsyncFile       file, 
    bool            notify, 
    void *          param
) {
    ASSERT(g_api.fileCreateSequence);
    return g_api.fileCreateSequence(file, notify, param);
}

//============================================================================
bool AsyncFileSeek (
    AsyncFile       file,
    uint64_t           distance,
    EFileSeekFrom   seekFrom
) {
    ASSERT(g_api.fileSeek);
    return g_api.fileSeek(file, distance, seekFrom);
}

//===========================================================================
void AsyncSocketConnect (
    AsyncCancelId *         cancelId,
    const NetAddress &      netAddr,
    FAsyncNotifySocketProc  notifyProc,
    void *                  param,
    const void *            sendData,
    unsigned                sendBytes,
    unsigned                connectMs,
    unsigned                localPort
) {
    ASSERT(g_api.socketConnect);
    g_api.socketConnect(
        cancelId,
        netAddr,
        notifyProc,
        param,
        sendData,
        sendBytes,
        connectMs,
        localPort
    );
}

//===========================================================================
void AsyncSocketConnectCancel (
    FAsyncNotifySocketProc  notifyProc,
    AsyncCancelId           cancelId
) {
    ASSERT(g_api.socketConnectCancel);
    g_api.socketConnectCancel(notifyProc, cancelId);
}

//===========================================================================
void AsyncSocketDisconnect (
    AsyncSocket             sock,
    bool                    hardClose
) {
    ASSERT(g_api.socketDisconnect);
    g_api.socketDisconnect(sock, hardClose);
}

//===========================================================================
void AsyncSocketDelete (AsyncSocket sock) {

    ASSERT(g_api.socketDelete);
    g_api.socketDelete(sock);
}

//===========================================================================
bool AsyncSocketSend (
    AsyncSocket             sock,
    const void *            data,
    unsigned                bytes
) {
    ASSERT(g_api.socketSend);
    return g_api.socketSend(sock, data, bytes);
}

//===========================================================================
bool AsyncSocketWrite (
    AsyncSocket             sock,
    const void *            buffer,
    unsigned                bytes,
    void *                  param
) {
    ASSERT(g_api.socketWrite);
    return g_api.socketWrite(sock, buffer, bytes, param);
}

//===========================================================================
void AsyncSocketSetNotifyProc (
    AsyncSocket             sock,
    FAsyncNotifySocketProc  notifyProc
) {
    ASSERT(g_api.socketSetNotifyProc);
    g_api.socketSetNotifyProc(sock, notifyProc);
}

//===========================================================================
void AsyncSocketSetBacklogAlloc (
    AsyncSocket             sock,
    unsigned                bufferSize
) {
    ASSERT(g_api.socketSetBacklogAlloc);
    g_api.socketSetBacklogAlloc(sock, bufferSize);
}

//===========================================================================
unsigned AsyncSocketStartListening (
    const NetAddress &      listenAddr,
    FAsyncNotifySocketProc  notifyProc
) {
    ASSERT(g_api.socketStartListening);
    return g_api.socketStartListening(listenAddr, notifyProc);
}

//===========================================================================
void AsyncSocketStopListening (
    const NetAddress &      listenAddr,
    FAsyncNotifySocketProc  notifyProc
) {
    ASSERT(g_api.socketStopListening);
    g_api.socketStopListening(listenAddr, notifyProc);
}

//============================================================================
void AsyncSocketEnableNagling (
    AsyncSocket             sock,
    bool                    enable
) {
    ASSERT(g_api.socketEnableNagling);
    g_api.socketEnableNagling(sock, enable);
}

//===========================================================================
void AsyncSocketRegisterNotifyProc (
    uint8_t                    connType, 
    FAsyncNotifySocketProc  notifyProc,
    unsigned                buildId,
    unsigned                buildType,
    unsigned                branchId,
    const Uuid &            productId
) {
    ASSERT(connType != kConnTypeNil);
    ASSERT(notifyProc);

    // Perform memory allocation outside lock
    ISocketConnType * ct    = new ISocketConnType;
    ct->notifyProc          = notifyProc;
    ct->connType            = connType;
    ct->buildId             = buildId;
    ct->buildType           = buildType;
    ct->branchId            = branchId;
    ct->productId           = productId;
    ct->flags               = kConnHashFlagsIgnore;

    s_notifyProcLock.EnterWrite();
    {
        s_notifyProcs.Add(ct);
    }
    s_notifyProcLock.LeaveWrite();
}

//===========================================================================
void AsyncSocketUnregisterNotifyProc (
    uint8_t                    connType, 
    FAsyncNotifySocketProc  notifyProc,
    unsigned                buildId,
    unsigned                buildType,
    unsigned                branchId,
    const Uuid &            productId
) {
    ISocketConnHash hash;
    hash.connType   = connType;
    hash.buildId    = buildId;
    hash.buildType  = buildType;
    hash.branchId   = branchId;
    hash.productId  = productId;
    hash.flags      = kConnHashFlagsExactMatch;

    ISocketConnType * scan;
    s_notifyProcLock.EnterWrite();
    {
        scan = s_notifyProcs.Find(hash);
        for (; scan; scan = s_notifyProcs.FindNext(hash, scan)) {
            if (scan->notifyProc != notifyProc)
                continue;

            // Unlink the object so it can be deleted outside the lock
            s_notifyProcs.Unlink(scan);
            break;
        }
    }
    s_notifyProcLock.LeaveWrite();

    // perform memory deallocation outside the lock
    delete scan;
}

//===========================================================================
FAsyncNotifySocketProc AsyncSocketFindNotifyProc (
    const uint8_t  buffer[],
    unsigned    bytes,
    unsigned *  bytesProcessed,
    unsigned *  connType,
    unsigned *  buildId,
    unsigned *  buildType,
    unsigned *  branchId,
    Uuid *      productId
) {
    for (;;) {
        // Get the connType
        ISocketConnHash hash;
        *bytesProcessed = GetConnHash(&hash, buffer, bytes);
        if (!*bytesProcessed)
            break;

        // Lookup notifyProc based on connType
        FAsyncNotifySocketProc proc;
        s_notifyProcLock.EnterRead();
        if (const ISocketConnType * scan = s_notifyProcs.Find(hash))
            proc = scan->notifyProc;
        else
            proc = nil;
        s_notifyProcLock.LeaveRead();
        if (!proc)
            break;

        // Success!
        *connType   = hash.connType;
        *buildId    = hash.buildId;
        *buildType  = hash.buildType;
        *branchId   = hash.branchId;
        *productId  = hash.productId;
        return proc;
    }

    // Failure!
    PerfAddCounter(kAsyncPerfSocketDisconnectInvalidConnType, 1);
    *bytesProcessed = 0;
    *connType       = 0;
    *buildId        = 0;
    *buildType      = 0;
    *branchId       = 0;
    *productId      = 0;
    return nil;
}
