/*==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==*/
#include "hsWindows.h"
#include "plServerGuid.h"
#include "pnMessage/plMessage.h"
#include "PubUtilLib/plStreamLogger/plStreamLogger.h"
#if HS_BUILD_FOR_WIN32
#include <process.h>
#else
#include <sys/time.h>
#include <unistd.h>
#endif

////////////////////////////////////////////////////////////////////

#ifdef HS_BUILD_FOR_WIN32

// Taken from plUnifiedTime, in turn taken from python source.
// TODO: Move this down to CoreLib someday (and rename it maybe).
#define MAGICWINDOWSOFFSET ((__int64)11644473600)
static uint32_t SecsSinceUNIXEpoch()
{
    FILETIME ft;
    GetSystemTimeAsFileTime(&ft);   /* 100 ns blocks since 01-Jan-1641 */
    __int64 ff,ffsecs;
    ff = *(__int64*)(&ft);
    ffsecs = ff/(__int64)10000000;
    return (uint32_t)(ffsecs-MAGICWINDOWSOFFSET);
}

#else

static uint32_t SecsSinceUNIXEpoch()
{
    struct timeval tv;
    gettimeofday(&tv, nil);
    return tv.tv_sec;
}

#endif


////////////////////////////////////////////////////////////////////

uint32_t  plServerGuid::fGuidSeed = 0;

plServerGuid::plServerGuid()
{
    Clear();
}

plServerGuid::plServerGuid( const plServerGuid & other )
{
    Clear();
    CopyFrom( other );
}

plServerGuid::plServerGuid(const char * s)
{
    Clear();
    FromString(s);
}

plServerGuid::plServerGuid(const hsWide & v)
{
    Clear();
    FromWide( v );
}

plServerGuid& plServerGuid::operator=( const plServerGuid & rhs )
{
    CopyFrom(rhs);
    return *this;
}


bool operator==(const plServerGuid & X, const plServerGuid & Y)
{
    return memcmp(X.N,Y.N,plServerGuid::kGuidBytes)==0;
}
bool operator!=(const plServerGuid & X, const plServerGuid & Y)
{
    return memcmp(X.N,Y.N,plServerGuid::kGuidBytes)!=0;
}
bool operator<(const plServerGuid & X, const plServerGuid & Y)
{
    return memcmp(X.N,Y.N,plServerGuid::kGuidBytes)<0;
}


hsWide plServerGuid::AsWide() const
{
    return fWide;
}

void plServerGuid::FromWide( const hsWide & v )
{
    fWide = v;
}


bool plServerGuid::IsSet() const
{
    return N[0]||N[1]||N[2]||N[3]||N[4]||N[5]||N[6]||N[7];
}

bool plServerGuid::IsEqualTo(const plServerGuid * other) const
{
    return (*this)==(*other);
}

const char * plServerGuid::AsString() const
{
    static char str[kGuidBytes*2+1];
    sprintf(str,"%02X%02X%02X%02X%02X%02X%02X%02X",N[0],N[1],N[2],N[3],N[4],N[5],N[6],N[7]);
    return str;
}

std::string plServerGuid::AsStdString( void ) const
{
    std::string str;
    str.resize(kGuidBytes*2+1);
    int n = sprintf(const_cast<char*>(str.data()),"%02X%02X%02X%02X%02X%02X%02X%02X",N[0],N[1],N[2],N[3],N[4],N[5],N[6],N[7]);
    str.resize(n);
    return str;
}


static unsigned char hexValues[] =
{
    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
    0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x00,0x00,0x00,0x00,0x00,0x00,
    0x00,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
    0x00,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
};


bool plServerGuid::FromString(const char * s)
{
    if (!s || (s && strlen(s)!=kGuidBytes*2 ) )
    {
        Clear();
        return false;
    }
    N[0]  = hexValues[s[0]]<<4;
    N[0] += hexValues[s[1]];
    N[1]  = hexValues[s[2]]<<4;
    N[1] += hexValues[s[3]];
    N[2]  = hexValues[s[4]]<<4;
    N[2] += hexValues[s[5]];
    N[3]  = hexValues[s[6]]<<4;
    N[3] += hexValues[s[7]];
    N[4]  = hexValues[s[8]]<<4;
    N[4] += hexValues[s[9]];
    N[5]  = hexValues[s[10]]<<4;
    N[5] += hexValues[s[11]];
    N[6]  = hexValues[s[12]]<<4;
    N[6] += hexValues[s[13]];
    N[7]  = hexValues[s[14]]<<4;
    N[7] += hexValues[s[15]];
    return true;
}


void plServerGuid::Read(hsStream * s, hsResMgr*)
{
    s->LogSubStreamStart("push me");
    s->LogSubStreamPushDesc("plServerGuid");
    plMsgCArrayHelper::Peek(N,kGuidBytes,s);
    s->LogSubStreamEnd();
}

void plServerGuid::Write(hsStream * s, hsResMgr*)
{
    plMsgCArrayHelper::Poke(N,kGuidBytes,s);
}

void plServerGuid::CopyFrom(const plServerGuid & other)
{
    memcpy(N,other.N,kGuidBytes);
}

void plServerGuid::CopyFrom(const plServerGuid * other)
{
    if(other)
        memcpy(N,other->N,kGuidBytes);
    else
        Clear();
}

void plServerGuid::Clear()
{
    memset(N,0,kGuidBytes);
}

void plServerGuid::SetGuidSeed(uint32_t seed)
{
    fGuidSeed = seed;
}

plServerGuid plServerGuid::GenerateGuid()
{
//   |  N[0] |  N[1] |  N[2] |  N[3] |  N[4] |  N[5] |  N[6] |  N[7] |
//   43210987654321098765432109876543210987654321098765432109876543210
//   01234567890123456789012345678901234567890123456789012345678901234
//   64              48              32              16              0
//   |     fGuidSeed         |    Current Time       |    Counter    |
//
//  fGuidSeed:      24 bits (settable. default is getpid())
//  Current Time:   24 bits (seconds. ~8.5 year cycle)
//  Counter:        16 bits (always increasing per process)

    static uint16_t   StaticCounter = 0;
    if (!fGuidSeed)
    {
        hsStatusMessage( "fGuidSeed not set yet. Cannot generate a reliable guid! Setting fGuidSeed=getpid()." );
//      hsAssert(fGuidSeed,"fGuidSeed not set yet. Cannot generate a reliable guid.\nIgnoring this assert will set fGuidSeed=getpid().");
        fGuidSeed = getpid();
    }

    uint32_t currTime = SecsSinceUNIXEpoch();

    plServerGuid guid;
    guid.N[0] = (uint8_t)((fGuidSeed & 0x00FF0000)>>16);
    guid.N[1] = (uint8_t)((fGuidSeed & 0x0000FF00)>> 8);
    guid.N[2] = (uint8_t)(fGuidSeed & 0x000000FF);
    guid.N[3] = (uint8_t)((currTime  & 0x00FF0000)>>16);
    guid.N[4] = (uint8_t)((currTime  & 0x0000FF00)>> 8);
    guid.N[5] = (uint8_t)(currTime  & 0x000000FF);
    guid.N[6] = (StaticCounter & 0xFF00)>> 8;
    guid.N[7] = (StaticCounter & 0x00FF);

    StaticCounter++;

    return guid;
}


////////////////////////////////////////////////////////////////////
// End.
