/*==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 <cmath>

#include "HeadSpin.h"
#include "plRandomCommandMod.h"
#include "pnSceneObject/plSceneObject.h"
#include "plMessage/plAnimCmdMsg.h"
#include "pnMessage/plEventCallbackMsg.h"
#include "plgDispatch.h"
#include "hsTimer.h"


static const float kRandNormalize = 1.f / 32767.f;

plRandomCommandMod::plRandomCommandMod()
{
    fState = 0;
    fMode = kNormal;
    fCurrent = -1;

    fMinDelay = 0;
    fMaxDelay = 0;
}

plRandomCommandMod::~plRandomCommandMod()
{
}

// return how many are left to choose from
int plRandomCommandMod::IExcludeSelections(int ncmds)
{
    if( fMode & kCoverall )
    {
        int nLeft = ncmds;

        fExcluded.SetBit(fCurrent);

        // Count how many haven't been played.
        int i;
        for( i = ncmds-1; i >= 0; --i )
        {
            if( fExcluded.IsBitSet(i) )
                nLeft--;
        }

        // If we're out of cmds, and OneCycle is set,
        // we're out of cmds until the next play.
        // Go ahead and reset for that.
        // If we're out and OneCycle isn't set, then go ahead 
        // and set up for a new cycle.
        if( !nLeft )
        {
            fExcluded.Clear();
            if( fMode & kNoRepeats )
                fExcluded.SetBit(fCurrent);

            if( fMode & kOneCycle )
                return 0;

            nLeft = ncmds;
            if( ( fMode & kNoRepeats ) && ncmds > 1 )
                nLeft--;
        }

        return nLeft;
    }
    double currTime = hsTimer::GetSysSeconds();
    fExcluded.Clear();
    int i;
    for( i = 0; i < fEndTimes.GetCount(); i++ )
    {
        if( fEndTimes[i] > currTime )
        {
            ncmds--;
            fExcluded.SetBit(i);
        }
    }
    if( fMode & kNoRepeats )
    {
        ncmds--;
        fExcluded.SetBit(fCurrent);
        return ncmds;
    }

    return ncmds;
}

float plRandomCommandMod::IGetDelay(float len) const
{
    float r = float(rand() * kRandNormalize);

    float delay = fMinDelay + (fMaxDelay - fMinDelay) * r;

    if( fMode & kDelayFromEnd )
        delay += len;

    if( delay < 0 )
        delay = fmodf(len, -delay);

    return delay;
}

bool plRandomCommandMod::ISelectNext(int ncmds)
{
    if( fMode & kSequential )
    {
        if( ++fCurrent >= ncmds )
        {
            if( fMode & kOneCycle )
            {
                fCurrent = -1;
                return false;
            }
            fCurrent = 0;
        }
        return true;
    }
    float r = float(rand() * kRandNormalize);

    int nSelect = ncmds;
    
    if( fCurrent >= 0 )
        nSelect = IExcludeSelections(ncmds);

    if( !nSelect )
        return false;

    int nth = int(r * (float(nSelect)-1.e-3f));
    
    int iNext = 0;
    int i;
    for( i = 0; i < ncmds; i++ )
    {
        if( !fExcluded.IsBitSet(i) )
        {
            if( !nth-- )
            {
                iNext = i;
                break;
            }
        }
    }
    fCurrent = iNext;

    return true;
}

void plRandomCommandMod::IStart() 
{ 
    if( !IStopped() )
        return;

    fState &= ~kStopped; 
    IPlayNextIfMaster();
}

void plRandomCommandMod::IStop() 
{ 
    fState |= kStopped; 
}

void plRandomCommandMod::IPlayNextIfMaster()
{
    if( !fTarget )
        IRetry(2.f);
    
    if( fTarget->IsLocallyOwned() == plSynchedObject::kNo )     // if this object is a proxy, it should just wait for network cmds 
        return;

    if( IStopped() )
        return;

    IPlayNext();
}

bool plRandomCommandMod::MsgReceive(plMessage* msg)
{
    // plAnimCmdMsg - interpret start/stop appropriately.
    // could overinterpret set loop points to limit range of
    // cmds we use to a window of the total set.
    plAnimCmdMsg* anim = plAnimCmdMsg::ConvertNoRef(msg);
    if( anim )
    {
        if( anim->GetSender() != GetKey() )
        {
#if 0
            hsStatusMessageF("someone triggered me, remote=%d\n", 
                msg->HasBCastFlag(plMessage::kNetNonLocal));
#endif
            if( anim->Cmd(plAnimCmdMsg::kContinue) )
                IStart();
            if( anim->Cmd(plAnimCmdMsg::kStop) )
                IStop();
            if( anim->Cmd(plAnimCmdMsg::kToggleState) )
            {
                if( IStopped() )
                    IStart();
                else
                    IStop();
            }
        }
        else
        {
            
#if 0
            hsStatusMessageF("play next if master, remote=%d\n", 
                msg->HasBCastFlag(plMessage::kNetNonLocal));
#endif
            IPlayNextIfMaster();
        }
        return true;
    }

    // Don't understand, pass on to base class.
    return plSingleModifier::MsgReceive(msg);
}

void plRandomCommandMod::IReset()
{
    fCurrent = -1;
    fExcluded.Clear();

    if( !IStopped() )
        IRetry(0);
}

void plRandomCommandMod::Read(hsStream* s, hsResMgr* mgr)
{
    plSingleModifier::Read(s, mgr);

    fMode = s->ReadByte();
    fState = s->ReadByte();

    fMinDelay = s->ReadLEScalar();
    fMaxDelay = s->ReadLEScalar();

    IReset();
}

void plRandomCommandMod::Write(hsStream* s, hsResMgr* mgr)
{
    plSingleModifier::Write(s, mgr);

    s->WriteByte(fMode);
    s->WriteByte(fState);

    s->WriteLEScalar(fMinDelay);
    s->WriteLEScalar(fMaxDelay);
}

void plRandomCommandMod::IRetry(float secs)
{
    IStop();

    double t = hsTimer::GetSysSeconds() + secs;

    plAnimCmdMsg* msg = new plAnimCmdMsg(nil, GetKey(), &t);
    msg->SetCmd(plAnimCmdMsg::kContinue);
    plgDispatch::MsgSend(msg);
}