/*==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 "plLOSDispatch.h"
#include "plSimulationMgr.h"
#include "plgDispatch.h"
#include "plMessage/plLOSRequestMsg.h"
#include "plMessage/plLOSHitMsg.h"
#include "pnKeyedObject/plFixedKey.h"
#include "pnSceneObject/plSceneObject.h"
#include "plModifier/plLogicModifier.h"
#include "plPXPhysical.h"
#include "plPXPhysicalControllerCore.h"
#include "plPXConvert.h"

#include "plAvatar/plAvatarMgr.h"
#include "plAvatar/plArmatureMod.h"

#include <NxPhysics.h>

#include "plProfile.h"
plProfile_Extern(LineOfSight);

class myRaycastReport : public NxUserRaycastReport
{
public:
    void InitCast(plSimDefs::plLOSDB db, plLOSRequestMsg::TestType type)
    {
        fDB = db;
        fType = type;
        fHitObj = nil;
        fNormal.Set(0, 0, 0);
        fPoint.Set(0, 0, 0);
        fDist = FLT_MAX;
    }

    bool GotHit() { return fDist != FLT_MAX; }
    plKey GetObj() { return fHitObj; }
    hsScalar GetDistance() { return fDist; }
    const hsVector3& GetNormal() { return fNormal; }
    const hsPoint3& GetPoint() { return fPoint; }
    void ResetHitObj(){fHitObj=nil;}
private:
    virtual bool onHit(const NxRaycastHit& hit)
    {
        NxActor& hitActor = hit.shape->getActor();
        plPXPhysical* phys = (plPXPhysical*)hitActor.userData;

        plKey objKey = nil;
        UInt16 objDB = plSimDefs::kLOSDBNone;

        if (phys)
        {
            objKey = phys->GetObjectKey();
            objDB = phys->GetAllLOSDBs();
        }
        else
        {
            bool isController;
            plPXPhysicalControllerCore* controller = plPXPhysicalControllerCore::GetController(hitActor,&isController);
            if (controller)
            {
                objKey = controller->GetOwner();
                objDB = controller->GetLOSDB();
            }
        }

        // is the object's physic enabled and is it in the database that we are looking for?
        if ( !phys || !phys->GetProperty(plSimulationInterface::kDisable) )
        {
            if ( (fDB & objDB) != 0)
            {
                if (fType == plLOSRequestMsg::kTestAny || hit.distance < fDist)
                {
                    // need one more test... if it is a clickable need to see if it is enabled
                    bool disabled = false;
                    if ( objKey )
                    {
                        plSceneObject* so = plSceneObject::ConvertNoRef( objKey->GetObjectPtr() );
                        if (so)
                        {
                            int i;
                            for ( i=0; i < so->GetNumModifiers(); i++)
                            {
                                plLogicModifier* lo = (plLogicModifier*)plLogicModifier::ConvertNoRef(so->GetModifier(i) );
                                if (lo)
                                {
                                    disabled = lo->Disabled();
                                    break;
                                }
                            }
                        }
                    }

                    if (!disabled)
                    {
                        fHitObj = objKey;
                        fNormal.Set(hit.worldNormal.x, hit.worldNormal.y, hit.worldNormal.z);
                        fPoint.Set(hit.worldImpact.x, hit.worldImpact.y, hit.worldImpact.z);
                        fDist = hit.distance;

                        if (fType == plLOSRequestMsg::kTestAny)
                            return false;
                    }
                }
            }
        }

        return true;
    }

    plSimDefs::plLOSDB fDB;
    plLOSRequestMsg::TestType fType;

    plKey fHitObj;
    hsVector3 fNormal;
    hsPoint3 fPoint;
    hsScalar fDist;
} gMyReport;

plLOSDispatch::plLOSDispatch()
{
    RegisterAs(kLOSObject_KEY);
    plgDispatch::Dispatch()->RegisterForExactType(plLOSRequestMsg::Index(), GetKey());
}

plLOSDispatch::~plLOSDispatch()
{
    plgDispatch::Dispatch()->UnRegisterForExactType(plLOSRequestMsg::Index(), GetKey());
}

hsBool plLOSDispatch::MsgReceive(plMessage* msg)
{

    plLOSRequestMsg* requestMsg = plLOSRequestMsg::ConvertNoRef(msg);
    if (requestMsg)
    {
        plProfile_BeginTiming(LineOfSight);

        plSimulationMgr* sim = plSimulationMgr::GetInstance();

        plKey worldKey = requestMsg->fWorldKey;
        if (!worldKey)
        {
            plArmatureMod* av = plAvatarMgr::GetInstance()->GetLocalAvatar();
            if ( av && av->GetController() )
                worldKey = av->GetController()->GetSubworld();
        }

        hsPoint3 from = requestMsg->fFrom;
        hsPoint3 at = requestMsg->fTo;

        // requests are always sent in world space, but they might
        // need to be converted to subworld space
        hsMatrix44 l2w, w2l;
        if (worldKey)
        {
            plSceneObject* so = plSceneObject::ConvertNoRef(worldKey->ObjectIsLoaded());
            if (so)
            {
                l2w = so->GetLocalToWorld();
                w2l = so->GetWorldToLocal();
                from = w2l * from;
                at = w2l * at;
            }
        }
        else
        {
            l2w.Reset();
            w2l.Reset();
        }

        NxScene* scene = sim->GetScene(worldKey);

        gMyReport.InitCast(requestMsg->GetRequestType(), requestMsg->GetTestType());

        hsVector3 norm = hsVector3(at - from);
        hsScalar dist = norm.Magnitude();
        norm.Normalize();

        NxRay worldRay;
        worldRay.dir = plPXConvert::Vector(norm);
        worldRay.orig = plPXConvert::Point(from);
        //PhysX will complain to log if ray distance is less than or equal to Zero, besides shouldn't  bother throwing 
        // a point, and if we have negative we have some serious problems
        if(dist>0.0f)
        {
            scene->raycastAllShapes(worldRay, gMyReport, NX_ALL_SHAPES, 0xffffffff, dist, NX_RAYCAST_DISTANCE | NX_RAYCAST_IMPACT | NX_RAYCAST_NORMAL);
        }
        else{
            SimLog("%s sent out a LOS request with a ray length of %d.", requestMsg->GetSender()->GetName(), dist);
        }
        if (gMyReport.GotHit())
        {
            // We got a hit, save off the info
            plMessage* hitMsg = ICreateHitMsg(requestMsg, l2w);

            if (requestMsg->GetCullDB() != plSimDefs::kLOSDBNone)
            {
                // If we have a cull db, adjust the length of the raycast to be from the
                // original point to the object we hit.  If we find anything from the cull
                // db in there, the cast fails.
                hsScalar dist = gMyReport.GetDistance();
                if(dist!=0.0)
                {
                    gMyReport.InitCast(requestMsg->GetCullDB(), plLOSRequestMsg::kTestAny);
                    scene->raycastAllShapes(worldRay, gMyReport, NX_ALL_SHAPES, 0xffffffff, dist, NX_RAYCAST_DISTANCE | NX_RAYCAST_IMPACT | NX_RAYCAST_NORMAL);

                    if (gMyReport.GotHit())
                    {
                        delete hitMsg;
                        hitMsg = nil;

                        if (requestMsg->GetReportType() == plLOSRequestMsg::kReportMiss ||
                            requestMsg->GetReportType() == plLOSRequestMsg::kReportHitOrMiss)
                        {
                            ICreateMissMsg(requestMsg)->Send();
                        }
                    }
                }
                else// we are right on top of the object I assume that means we hit it
                {// since PhysX would have complained we will log it anyways. Just so we have a better idea, where this
                    //was happening previously
                    SimLog("%s sent out a LOS request. The second cast for culling was of length 0. ABORTING and assuming hit.", requestMsg->GetSender()->GetName());
                }

            }

            if (hitMsg &&
                (requestMsg->GetReportType() == plLOSRequestMsg::kReportHit ||
                requestMsg->GetReportType() == plLOSRequestMsg::kReportHitOrMiss))
                hitMsg->Send();
        }
        else
        {
            if (requestMsg->GetReportType() == plLOSRequestMsg::kReportMiss ||
                requestMsg->GetReportType() == plLOSRequestMsg::kReportHitOrMiss)
            {
                ICreateMissMsg(requestMsg)->Send();
            }
        }

        plProfile_EndTiming(LineOfSight);
        gMyReport.ResetHitObj();
        return true;
    }

    return hsKeyedObject::MsgReceive(msg);
}

plMessage* plLOSDispatch::ICreateHitMsg(plLOSRequestMsg* requestMsg, hsMatrix44& l2w)
{
    plKey ourKey = GetKey();
    plKey rcvKey = requestMsg->GetSender();
    plLOSHitMsg* hitMsg = TRACKED_NEW plLOSHitMsg(ourKey, rcvKey, nil);
    hitMsg->fNoHit = false;
    hitMsg->fObj = gMyReport.GetObj();
    hitMsg->fDistance = gMyReport.GetDistance();
    hitMsg->fNormal = l2w * gMyReport.GetNormal();
    hitMsg->fHitPoint = l2w * gMyReport.GetPoint();
    hitMsg->fRequestID = requestMsg->GetRequestID();
    return hitMsg;
}

plMessage* plLOSDispatch::ICreateMissMsg(plLOSRequestMsg* requestMsg)
{
    plKey ourKey = GetKey();
    plKey rcvKey = requestMsg->GetSender();
    plLOSHitMsg* missMsg = TRACKED_NEW plLOSHitMsg(ourKey, rcvKey, nil);
    missMsg->fNoHit = true;
    missMsg->fObj = nil;
    missMsg->fRequestID = requestMsg->GetRequestID();
    return missMsg;
}