/*==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 "plCollisionDetector.h"

#include "plgDispatch.h"
#include "plPhysical.h"

#include <cmath>

#include "pnNetCommon/plNetApp.h"
#include "pnMessage/plCameraMsg.h"
#include "pnMessage/plPlayerPageMsg.h"
#include "pnMessage/plTimeMsg.h"
#include "pnSceneObject/plCoordinateInterface.h"
#include "pnSceneObject/plSceneObject.h"

#include "plAvatar/plArmatureMod.h"
#include "plAvatar/plAvatarMgr.h"
#include "plAvatar/plAvBrainHuman.h"
#include "plAvatar/plAvBrainSwim.h"
#include "plAvatar/plAvBrainDrive.h"
#include "plAvatar/plPhysicalControllerCore.h"
#include "plMessage/plActivatorMsg.h"
#include "plMessage/plCollideMsg.h"
#include "plMessage/plSimStateMsg.h"
#include "plModifier/plDetectorLog.h"

plArmatureMod* plCollisionDetector::IGetAvatarModifier(const plKey& key)
{
    plSceneObject* avObj = plSceneObject::ConvertNoRef(key->ObjectIsLoaded());
    if (avObj)
    {
        // search through its modifiers to see if one of them is an avatar modifier
        plArmatureMod* avMod = nullptr;
        for (size_t i = 0; i < avObj->GetNumModifiers(); i++)
        {
            const plModifier* mod = avObj->GetModifier(i);
            // see if it is an avatar mod base class
            avMod = const_cast<plArmatureMod*>(plArmatureMod::ConvertNoRef(mod));
            if (avMod)
                return avMod;
        }
    }

    return nullptr;
}

bool plCollisionDetector::IIsDisabledAvatar(const plKey& key)
{
    plArmatureMod* avMod = IGetAvatarModifier(key);
    plArmatureBrain* avBrain = avMod ? avMod->GetCurrentBrain() : nullptr;
    return (plAvBrainDrive::ConvertNoRef(avBrain) != nullptr);
}

bool plCollisionDetector::MsgReceive(plMessage* msg)
{
    plCollideMsg* pCollMsg = plCollideMsg::ConvertNoRef(msg);

    if (pCollMsg)
    {
        // If the avatar is disabled (flying around), don't trigger
        if (IIsDisabledAvatar(pCollMsg->fOtherKey))
            return false;

        if (fType & kTypeBump) 
        {
            if (!fBumped && !fTriggered)
            {
                for (const plKey& receiver : fReceivers)
                {
                    plActivatorMsg* pMsg = new plActivatorMsg;
                    pMsg->AddReceiver(receiver);

                    if (fProxyKey)
                        pMsg->fHiteeObj = fProxyKey;
                    else
                        pMsg->fHiteeObj = GetTarget()->GetKey();
                    pMsg->fHitterObj = pCollMsg->fOtherKey;
                    pMsg->SetSender(GetKey());
                    pMsg->SetTriggerType( plActivatorMsg::kCollideContact );
                    plgDispatch::MsgSend( pMsg );
                }
                fBumped = true;
                fTriggered = true;
                plgDispatch::Dispatch()->RegisterForExactType(plEvalMsg::Index(), GetKey());
                return true;
            }
            if (fTriggered)
            {
                fBumped = true;
                return true;
            }
            return false;
        }

        for (const plKey& receiver : fReceivers)
        {
            plActivatorMsg* pMsg = new plActivatorMsg;
            pMsg->AddReceiver(receiver);
            if (fProxyKey)
                pMsg->fHiteeObj = fProxyKey;
            else
                pMsg->fHiteeObj = GetTarget()->GetKey();
            pMsg->fHitterObj = pCollMsg->fOtherKey;
            pMsg->SetSender(GetKey());
            
            if (fType & kTypeEnter && pCollMsg->fEntering)
            {
                pMsg->SetTriggerType( plActivatorMsg::kCollideEnter );
                plgDispatch::MsgSend( pMsg );
                continue;
            }
            if (fType & kTypeUnEnter && pCollMsg->fEntering)
            {
                pMsg->SetTriggerType( plActivatorMsg::kEnterUnTrigger );
                plgDispatch::MsgSend( pMsg );
                continue;
            }
            if(fType & kTypeExit && !pCollMsg->fEntering)
            {
                pMsg->SetTriggerType( plActivatorMsg::kCollideExit );
                plgDispatch::MsgSend( pMsg );
                continue;
            }
            if(fType & kTypeUnExit && !pCollMsg->fEntering)
            {
                pMsg->SetTriggerType( plActivatorMsg::kExitUnTrigger );
                plgDispatch::MsgSend( pMsg );
                continue;
            }
            if (fType & kTypeAny)
            {
                pMsg->SetTriggerType( plActivatorMsg::kCollideContact );
                plgDispatch::MsgSend( pMsg );
                continue;
            }

            delete (pMsg);
        }
        return true;
    }

    plEvalMsg* pEval = plEvalMsg::ConvertNoRef(msg);
    if (pEval)
    {
        if (!fBumped && fTriggered)
        {
            plgDispatch::Dispatch()->UnRegisterForExactType(plEvalMsg::Index(), GetKey());
            for (const plKey& receiver : fReceivers)
            {
                plActivatorMsg* pMsg = new plActivatorMsg;
                pMsg->AddReceiver(receiver);
                if (fProxyKey)
                    pMsg->fHiteeObj = fProxyKey;
                else
                    pMsg->fHiteeObj = GetTarget()->GetKey();
                pMsg->SetSender(GetKey());
                pMsg->SetTriggerType( plActivatorMsg::kCollideUnTrigger );
                plgDispatch::MsgSend( pMsg );
                fTriggered = false;
            }
        }
        else
        if (fTriggered && fBumped)
        {
            fBumped = false;
        }
        return true;
    }

    return plDetectorModifier::MsgReceive(msg);
}

void plCollisionDetector::Read(hsStream* stream, hsResMgr* mgr)
{
    plDetectorModifier::Read(stream, mgr);
    stream->ReadByte(&fType);
}
void plCollisionDetector::Write(hsStream* stream, hsResMgr* mgr)
{
    plDetectorModifier::Write(stream, mgr);
    stream->WriteByte(fType);
}

/////////////////////////////////
/////////////////////////////////
/////////////////////////////////
/////////////////////////////////
// camera region detector

plCameraRegionDetector::~plCameraRegionDetector()
{
    for (plCameraMsgVec::iterator it = fMessages.begin(); it != fMessages.end(); ++it)
        hsRefCnt_SafeUnRef(*it);
}

void plCameraRegionDetector::ISendTriggerMsg()
{
    for (plCameraMsgVec::iterator it = fMessages.begin(); it != fMessages.end(); ++it)
    {
        plCameraMsg* msg = *it;
        if (fIsInside)
            msg->SetCmd(plCameraMsg::kEntering);
        else
            msg->ClearCmd(plCameraMsg::kEntering);
        msg->SendAndKeep();
    }
}

bool plCameraRegionDetector::MsgReceive(plMessage* msg)
{
    plCollideMsg* pCollMsg = plCollideMsg::ConvertNoRef(msg);
    if (pCollMsg)
    {
        // camera collisions are only for the local player
        if (plNetClientApp::GetInstance()->GetLocalPlayerKey() != pCollMsg->fOtherKey)
            return true;

        if (!fWaitingForEval)
            IRegisterForEval();

        fEntering = (pCollMsg->fEntering != 0);

        return true;
    }

    return plObjectInVolumeDetector::MsgReceive(msg);
}
void plCameraRegionDetector::Read(hsStream* stream, hsResMgr* mgr)
{
    plDetectorModifier::Read(stream, mgr);
    int n = stream->ReadLE32();
    fMessages.resize(n);
    for(size_t i = 0; i < n; i++ )
    {   
        plCameraMsg* pMsg =  plCameraMsg::ConvertNoRef(mgr->ReadCreatable(stream));
        fMessages[i] = pMsg;
    }

}
void plCameraRegionDetector::Write(hsStream* stream, hsResMgr* mgr)
{
    plDetectorModifier::Write(stream, mgr);
    stream->WriteLE32((uint32_t)fMessages.size());
    for (plCameraMsg* msg : fMessages)
        mgr->WriteCreatable(stream, msg);
}

void plCameraRegionDetector::IHandleEval(plEvalMsg*)
{
    if (fIsInside != fEntering) {
        fIsInside = fEntering;
        plDetectorLog::Log("{} CameraRegion: {}", fIsInside ? "Entering" : "Exiting", GetKeyName());
        ISendTriggerMsg();
    }
    plgDispatch::Dispatch()->UnRegisterForExactType(plEvalMsg::Index(), GetKey());
    fWaitingForEval = false;
}

/////////////////////////////////
/////////////////////////////////
/////////////////////////////////
/////////////////////////////////
// object-in-volume detector

void plObjectInVolumeDetector::ITrigger(const plKey& hitter, bool entering)
{
    for (auto& collisionInfo : fCollisionList) {
        if (collisionInfo.fHitter == hitter) {
            collisionInfo.fEntering = entering;
            return;
        }
    }

    fCollisionList.emplace_back(hitter, entering);
}

void plObjectInVolumeDetector::IRegisterForEval()
{
    fWaitingForEval = true;
    plgDispatch::Dispatch()->RegisterForExactType(plEvalMsg::Index(), GetKey());
}

void plObjectInVolumeDetector::ISendTriggerMsg(plKey hitter, bool entering)
{
    plActivatorMsg* activatorMsg = new plActivatorMsg();
    activatorMsg->SetSender(GetKey());
    activatorMsg->AddReceivers(fReceivers);
    activatorMsg->fHiteeObj = fProxyKey ? fProxyKey : GetTarget()->GetKey();
    activatorMsg->fHitterObj = std::move(hitter);
    if (entering)
        activatorMsg->SetTriggerType(plActivatorMsg::kVolumeEnter);
    else
        activatorMsg->SetTriggerType(plActivatorMsg::kVolumeExit);

    plgDispatch::MsgSend(activatorMsg);
}

bool plObjectInVolumeDetector::MsgReceive(plMessage* msg)
{
    plCollideMsg* pCollMsg = plCollideMsg::ConvertNoRef(msg);
    if (pCollMsg)
    {
        // If the avatar is disabled (flying around), don't trigger
        if (IIsDisabledAvatar(pCollMsg->fOtherKey))
            return false;

        if (!fWaitingForEval)
            IRegisterForEval();

        ITrigger(pCollMsg->fOtherKey, (pCollMsg->fEntering != 0));
        return true;
    }

    plEvalMsg* pEvalMsg = plEvalMsg::ConvertNoRef(msg);
    if (pEvalMsg)
        IHandleEval(pEvalMsg);

    plPlayerPageMsg* pageMsg = plPlayerPageMsg::ConvertNoRef(msg);
    if (pageMsg && pageMsg->fUnload)
    {
        ITrigger(pageMsg->fPlayer, false);
    }

    return plCollisionDetector::MsgReceive(msg);
}

void plObjectInVolumeDetector::IHandleEval(plEvalMsg*)
{
    for (const auto& collisionInfo : fCollisionList) {
        auto j = fCurrentResidents.find(collisionInfo.fHitter);
        bool wasInside = j != fCurrentResidents.end();
        if (collisionInfo.fEntering != wasInside) {
            if (collisionInfo.fEntering) {
                fCurrentResidents.insert(collisionInfo.fHitter);
                plDetectorLog::Log("{}: Sending Volume Enter ActivatorMsg", GetKeyName());
                ISendTriggerMsg(collisionInfo.fHitter, true);
            } else {
                fCurrentResidents.erase(j);
                plDetectorLog::Log("{}: Sending Volume Exit ActivatorMsg", GetKeyName());
                ISendTriggerMsg(collisionInfo.fHitter, false);
            }
        }
    }
}

void plObjectInVolumeDetector::SetTarget(plSceneObject* so)
{
    plCollisionDetector::SetTarget(so);

    if (so)
        plgDispatch::Dispatch()->RegisterForExactType(plPlayerPageMsg::Index(), GetKey());
    else
        plgDispatch::Dispatch()->UnRegisterForExactType(plPlayerPageMsg::Index(), GetKey());
}

void plObjectInVolumeDetector::Read(hsStream* stream, hsResMgr* mgr)
{
    plCollisionDetector::Read(stream, mgr);
}

void plObjectInVolumeDetector::Write(hsStream* stream, hsResMgr* mgr)
{
    plCollisionDetector::Write(stream, mgr);
}


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


plObjectInVolumeAndFacingDetector::plObjectInVolumeAndFacingDetector() :
    plObjectInVolumeDetector(),
    fFacingTolerance(0),
    fNeedWalkingForward(false),
    fAvatarInVolume(false),
    fTriggered(false)
{
}

plObjectInVolumeAndFacingDetector::~plObjectInVolumeAndFacingDetector()
{
}

void plObjectInVolumeAndFacingDetector::SetFacingTolerance(int degrees)
{
    fFacingTolerance = cos(hsDegreesToRadians(float(degrees)));
}

void plObjectInVolumeAndFacingDetector::ICheckForTrigger()
{
    plArmatureMod* armMod = plAvatarMgr::GetInstance()->GetLocalAvatar();
    plSceneObject* avatar = armMod ? armMod->GetTarget(0) : nullptr;
    plSceneObject* target = GetTarget();

    if (armMod && target)
    {
        hsVector3 playerView = avatar->GetCoordinateInterface()->GetLocalToWorld().GetAxis(hsMatrix44::kView);
        hsVector3 objView = target->GetCoordinateInterface()->GetLocalToWorld().GetAxis(hsMatrix44::kView);

        playerView.Normalize();
        objView.Normalize();

        float dot = playerView * objView;
//      hsStatusMessageF("Dot: %f Tolerance: %f", dot, fFacingTolerance);
        bool facing = dot >= fFacingTolerance;

        bool movingForward = false;
        if (fNeedWalkingForward) {
            plAvBrainHuman* hbrain = plAvBrainHuman::ConvertNoRef(armMod->FindBrainByClass(plAvBrainHuman::Index()));
            plAvBrainSwim* sbrain = plAvBrainSwim::ConvertNoRef(armMod->FindBrainByClass(plAvBrainSwim::Index()));

            // And are we walking or swimming toward it?
            if (hbrain && hbrain->IsMovingForward() && hbrain->fWalkingStrategy->IsOnGround())
                movingForward = true;
            else if (sbrain && sbrain->IsMovingForward() && sbrain->IsSwimming())
                movingForward = true;
        } else {
            movingForward = true;
        }

        if (facing && movingForward && !fTriggered)
        {
            plDetectorLog::Log("{}: Trigger InVolume&Facing", GetKeyName());
            fTriggered = true;
            ISendTriggerMsg(avatar->GetKey(), true);
        }
        else if (!facing && fTriggered)
        {
            plDetectorLog::Log("{}: Untrigger InVolume&Facing", GetKeyName());
            fTriggered = false;
            ISendTriggerMsg(avatar->GetKey(), false);
        }
    }
}

bool plObjectInVolumeAndFacingDetector::MsgReceive(plMessage* msg)
{
    // Avatar is entering or exiting our detector box
    plCollideMsg* collMsg = plCollideMsg::ConvertNoRef(msg);
    if (collMsg)
    {
        // make sure this is the local player... the notify will be the thing that propagates over the network
        if (plNetClientApp::GetInstance()->GetLocalPlayerKey() != collMsg->fOtherKey)
            return true;

        // If the avatar is disabled (flying around), don't trigger
        if (IIsDisabledAvatar(collMsg->fOtherKey))
            return false;

        fAvatarInVolume = (collMsg->fEntering != 0);

        if (fAvatarInVolume)
        {
            plgDispatch::Dispatch()->RegisterForExactType(plEvalMsg::Index(), GetKey());
            ICheckForTrigger();
        }
        else
        {
            plgDispatch::Dispatch()->UnRegisterForExactType(plEvalMsg::Index(), GetKey());

            // Avatar is leaving the volume, make sure to untrigger if we haven't already
            if (fTriggered)
            {
                fTriggered = false;
                ISendTriggerMsg(plNetClientApp::GetInstance()->GetLocalPlayerKey(), false);
            }
        }

        return true;
    }

    // Avatar is inside our detector box, so every frame we check if we need to trigger
    plEvalMsg* evalMsg = plEvalMsg::ConvertNoRef(msg);
    if (evalMsg)
    {
        ICheckForTrigger();
        return true;
    }

    return plObjectInVolumeDetector::MsgReceive(msg);
}

void plObjectInVolumeAndFacingDetector::Read(hsStream* stream, hsResMgr* mgr)
{
    plObjectInVolumeDetector::Read(stream, mgr);

    fFacingTolerance = stream->ReadLEFloat();
    fNeedWalkingForward = stream->ReadBool();
}

void plObjectInVolumeAndFacingDetector::Write(hsStream* stream, hsResMgr* mgr)
{
    plObjectInVolumeDetector::Write(stream, mgr);

    stream->WriteLEFloat(fFacingTolerance);
    stream->WriteBool(fNeedWalkingForward);
}

/////////////////////////////////
/////////////////////////////////
/////////////////////////////////
/////////////////////////////////
// subworld region detector

plSubworldRegionDetector::~plSubworldRegionDetector()
{
}


bool plSubworldRegionDetector::MsgReceive(plMessage* msg)
{
    plCollideMsg* pCollMsg = plCollideMsg::ConvertNoRef(msg);

    if (pCollMsg)
    {   
        if (plNetClientApp::GetInstance()->GetLocalPlayerKey() != pCollMsg->fOtherKey)
            return true;

        plArmatureMod* avMod = IGetAvatarModifier(pCollMsg->fOtherKey);
        if (avMod)
        {
            plDetectorLog::Log("{} subworld detector {}", pCollMsg->fEntering ? "Entering" : "Exiting", GetKeyName());

            if ((pCollMsg->fEntering && !fOnExit) ||
                (!pCollMsg->fEntering && fOnExit))
            {
                if (fSub)
                {
                    plSceneObject* SO = plSceneObject::ConvertNoRef(fSub->ObjectIsLoaded());
                    if (SO)
                    {
                        plDetectorLog::Special("Switching to subworld {}", fSub->GetName());

                        plKey nilKey;
                        plSubWorldMsg* msg = new plSubWorldMsg(GetKey(), avMod->GetKey(), fSub);
                        msg->Send();
                    }
                }
                else
                {
                    plDetectorLog::Special("Switching to main subworld");
                    plSubWorldMsg* msg = new plSubWorldMsg(GetKey(), avMod->GetKey(), nullptr);
                    msg->Send();
                }
            }
        }

        return true;
    }

    return plCollisionDetector::MsgReceive(msg);
}

void plSubworldRegionDetector::Read(hsStream* stream, hsResMgr* mgr)
{
    plDetectorModifier::Read(stream, mgr);
    fSub = mgr->ReadKey(stream);
    fOnExit = stream->ReadBool();
}
void plSubworldRegionDetector::Write(hsStream* stream, hsResMgr* mgr)
{
    plDetectorModifier::Write(stream, mgr);
    mgr->WriteKey(stream, fSub);
    stream->WriteBool(fOnExit);
}

///////////////////////////////////
///////////////////////////////////
/// plPanicLinkDetector
///////////////////////////////////
bool plPanicLinkRegion::MsgReceive(plMessage* msg)
{
    if (plCollideMsg* pCollMsg = plCollideMsg::ConvertNoRef(msg))
    {
        if (plNetClientApp::GetInstance()->GetLocalPlayerKey() != pCollMsg->fOtherKey)
            return true;

        // If the avatar is disabled (flying around), don't trigger
        if (IIsDisabledAvatar(pCollMsg->fOtherKey))
            return false;

        if (pCollMsg->fEntering)
        {
            plArmatureMod* avMod = IGetAvatarModifier(pCollMsg->fOtherKey);
            if (avMod)
            {
                if (avMod->IsLinkedIn())
                {
                    hsPoint3 pos;
                    if (avMod->GetController())
                    {
                        avMod->GetController()->GetPositionSim(pos);
                        plDetectorLog::Special("Avatar is panic linking. Position {f},{f},{f} and is {}",
                                               pos.fX, pos.fY, pos.fZ, avMod->GetController()->IsEnabled() ? "enabled" : "disabled");
                    }
                    avMod->PanicLink(fPlayLinkOutAnim);
                } else
                    plDetectorLog::Red("PANIC LINK {} before we actually linked in!", GetKey()->GetName());
            }
        }

        return true;
    }

    return plCollisionDetector::MsgReceive(msg);
}

void plPanicLinkRegion::Read(hsStream* stream, hsResMgr* mgr)
{
    plCollisionDetector::Read(stream, mgr);

    fPlayLinkOutAnim = stream->ReadBool();
}

void plPanicLinkRegion::Write(hsStream* stream, hsResMgr* mgr)
{
    plCollisionDetector::Write(stream, mgr);

    stream->WriteBool(fPlayLinkOutAnim);
}

/////////////////////////////////////////////////////////////////
//
// PLSIMPLEREGIONSENSOR
//
/////////////////////////////////////////////////////////////////

// ctor default
plSimpleRegionSensor::plSimpleRegionSensor()
: fEnterMsg(), fExitMsg()
{
}

// ctor canonical
plSimpleRegionSensor::plSimpleRegionSensor(plMessage *enterMsg, plMessage *exitMsg)
: fEnterMsg(enterMsg), fExitMsg(exitMsg)
{
}

// dtor
plSimpleRegionSensor::~plSimpleRegionSensor()
{
    if(fEnterMsg)
        fEnterMsg->UnRef();
    if(fExitMsg)
        fExitMsg->UnRef();
}

// WRITE
void plSimpleRegionSensor::Write(hsStream *stream, hsResMgr *mgr)
{
    plSingleModifier::Write(stream, mgr);
    if(fEnterMsg)
    {
        stream->WriteBool(true);
        mgr->WriteCreatable(stream, fEnterMsg);
    } else {
        stream->WriteBool(false);
    }
    if(fExitMsg)
    {
        stream->WriteBool(true);
        mgr->WriteCreatable(stream, fExitMsg);
    } else {
        stream->WriteBool(false);
    }
}

// READ
void plSimpleRegionSensor::Read(hsStream *stream, hsResMgr *mgr)
{
    plSingleModifier::Read(stream, mgr);
    if(stream->ReadBool())
    {
        fEnterMsg = plMessage::ConvertNoRef(mgr->ReadCreatable(stream));
    } else {
        fEnterMsg = nullptr;
    }

    if(stream->ReadBool())
    {
        fExitMsg = plMessage::ConvertNoRef(mgr->ReadCreatable(stream));
        hsAssert(fExitMsg, "Corrupted plSimpleRegionSensor during read.");
    } else {
        fExitMsg = nullptr;
    }
}

// MSGRECEIVE
bool plSimpleRegionSensor::MsgReceive(plMessage *msg)
{
    plCollideMsg* pCollMsg = plCollideMsg::ConvertNoRef(msg);

    if (pCollMsg)
    {
        // make sure this is the local player... the notify will be the thing that propagates over the network
        if (plNetClientApp::GetInstance()->GetLocalPlayerKey() != pCollMsg->fOtherKey)
            return true;

        plKey theThingWhatDoneHitUs = pCollMsg->fOtherKey;
        
        if(pCollMsg->fEntering)
        {
            if(fEnterMsg)
            {
                fEnterMsg->ClearReceivers();
                fEnterMsg->AddReceiver(theThingWhatDoneHitUs);
                fEnterMsg->Ref();
                fEnterMsg->Send();
            }
        } 
        else {
            if(fExitMsg)
            {
                fExitMsg->ClearReceivers();
                fExitMsg->AddReceiver(theThingWhatDoneHitUs);
                fExitMsg->Ref();
                fExitMsg->Send();
            }
        }
        return true;
    }
    return plSingleModifier::MsgReceive(msg);
}

// IEVAL
bool plSimpleRegionSensor::IEval(double secs, float del, uint32_t dirty)
{
    return false;
}

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

// Nuke the Read/Write functions on the next file format change
void plSwimDetector::Write(hsStream *stream, hsResMgr *mgr)
{
    plSimpleRegionSensor::Write(stream, mgr);

    stream->WriteByte(uint8_t(0));
    stream->WriteLEFloat(0.f);
    stream->WriteLEFloat(0.f);
}

void plSwimDetector::Read(hsStream *stream, hsResMgr *mgr)
{
    plSimpleRegionSensor::Read(stream, mgr);

    (void)stream->ReadByte();
    (void)stream->ReadLEFloat();
    (void)stream->ReadLEFloat();
}

bool plSwimDetector::MsgReceive(plMessage *msg)
{
    plCollideMsg* pCollMsg = plCollideMsg::ConvertNoRef(msg);

    if (pCollMsg)
    {
        //removed local player check because this will apply the brain to the local 
        //controller of the foreign avatar which we still want.
        //and if we prop swim state by notify messages we still have a chance of missing it from players
        //who were in the region before we linked in
        plKey theThingWhatDoneHitUs = pCollMsg->fOtherKey;
        if(pCollMsg->fEntering)
        {
            if(fEnterMsg)
            {
                fEnterMsg->ClearReceivers();
                fEnterMsg->AddReceiver(theThingWhatDoneHitUs);
                fEnterMsg->Ref();
                fEnterMsg->Send();
            }
        } 
        else {
        if(fExitMsg)
            {
                fExitMsg->ClearReceivers();
                fExitMsg->AddReceiver(theThingWhatDoneHitUs);
                fExitMsg->Ref();
                fExitMsg->Send();
            }
        }
        return true;
    }
    return plSimpleRegionSensor::MsgReceive(msg);
}
bool    plRidingAnimatedPhysicalDetector::MsgReceive(plMessage *msg)
{
    
    plCollideMsg* pCollMsg = plCollideMsg::ConvertNoRef(msg);

    if (pCollMsg)
    {
        //removed local player check because this will apply the brain to the local 
        //controller of the foreign avatar which we still want.
        //and if we prop  state by notify messages we still have a chance of missing it from players
        //who were in the region before we linked in
        plKey theThingWhatDoneHitUs = pCollMsg->fOtherKey;
        if(pCollMsg->fEntering)
        {
            if(fEnterMsg)
            {
                fEnterMsg->ClearReceivers();
                fEnterMsg->AddReceiver(theThingWhatDoneHitUs);
                fEnterMsg->Ref();
                fEnterMsg->Send();
            }
        } 
        else {
        if(fExitMsg)
            {
                fExitMsg->ClearReceivers();
                fExitMsg->AddReceiver(theThingWhatDoneHitUs);
                fExitMsg->Ref();
                fExitMsg->Send();
            }
        }
        return true;
    }
    return plSimpleRegionSensor::MsgReceive(msg);
}
