/*==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,
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You can contact Cyan Worlds, Inc. by email legal@cyan.com
 or by snail mail at:
      Cyan Worlds, Inc.
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*==LICENSE==*/

#include "plViewFaceModifier.h"

#include "HeadSpin.h"
#include "plgDispatch.h"
#include "hsFastMath.h"
#include "plPipeline.h"
#include "plProfile.h"

#include "pnMessage/plRefMsg.h"
#include "pnSceneObject/plCoordinateInterface.h"
#include "pnSceneObject/plSceneObject.h"

#include "plAvatar/plArmatureMod.h"
#include "plAvatar/plAvBrainHuman.h"
#include "plMessage/plAvatarMsg.h"
#include "plMessage/plListenerMsg.h"
#include "plMessage/plRenderMsg.h"

plProfile_CreateTimer("ViewFacing", "RenderSetup", ViewFace);

plViewFaceModifier::plViewFaceModifier()
    : fLastDirY(0.f, 1.f, 0.f),
      fScale(1.f, 1.f, 1.f),
      fFaceObj()
{
    fOrigLocalToParent.Reset();
    fOrigParentToLocal.Reset();

    SetFlag(kFaceCam); // default
}

void plViewFaceModifier::SetOrigTransform(const hsMatrix44& l2p, const hsMatrix44& p2l)
{
    fOrigLocalToParent = l2p;
    fOrigParentToLocal = p2l;
}

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

    fScale.Read(s);

    fOrigLocalToParent.Read(s);
    fOrigParentToLocal.Read(s);

    if( HasFlag(kFaceObj) )
        mgr->ReadKeyNotifyMe(s, new plGenRefMsg(GetKey(), plRefMsg::kOnCreate, 0, kRefFaceObj), plRefFlags::kPassiveRef);

    fOffset.Read(s);

    if( HasFlag(kMaxBounds) )
        fMaxBounds.Read(s);
}

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

    fScale.Write(s);

    fOrigLocalToParent.Write(s);
    fOrigParentToLocal.Write(s);

    if( HasFlag(kFaceObj) )
        mgr->WriteKey(s, fFaceObj); 

    fOffset.Write(s);

    if( HasFlag(kMaxBounds) )
        fMaxBounds.Write(s);
}

void plViewFaceModifier::SetMaxBounds(const hsBounds3Ext& bnd)
{
    SetFlag(kMaxBounds);
    fMaxBounds = bnd;
}

void plViewFaceModifier::SetTarget(plSceneObject* so)
{
    plSingleModifier::SetTarget(so);

    plgDispatch::Dispatch()->RegisterForExactType(plRenderMsg::Index(), GetKey());
    if( HasFlag(kFaceList) )
        plgDispatch::Dispatch()->RegisterForExactType(plListenerMsg::Index(), GetKey());
    if( HasFlag(kFacePlay) )
        plgDispatch::Dispatch()->RegisterForExactType(plArmatureUpdateMsg::Index(), GetKey());
}

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

bool plViewFaceModifier::IFacePoint(plPipeline* pipe, const hsPoint3& at)
{
#if 1 // BOUNDSTEST
    extern int mfCurrentTest;
    if( mfCurrentTest != 101 )
    if( HasFlag(kMaxBounds) )
    {
        if( !pipe->TestVisibleWorld(fMaxBounds) )
            return false;
    }
#endif // BOUNDSTEST

    if( !(GetTarget() && GetTarget()->GetCoordinateInterface()) )
        return false;
        
    hsMatrix44 worldToLocal = fOrigParentToLocal;   // parentToLocal
    if( GetTarget()->GetCoordinateInterface()->GetParent() && GetTarget()->GetCoordinateInterface()->GetParent() )
    {
        hsMatrix44 m;
        worldToLocal = worldToLocal *  GetTarget()->GetCoordinateInterface()->GetParent()->GetWorldToLocal();
    }
    
    hsPoint3 localAt = worldToLocal * at;
    float len = localAt.MagnitudeSquared();
    if( len <= 0 )
        return false;
    len = -hsFastMath::InvSqrtAppr(len);
    
    hsVector3 dirX, dirY;
    hsVector3 dirZ(localAt.fX * len, localAt.fY * len, localAt.fZ * len);

    if( HasFlag(kPivotFace) )
    {
        dirY.Set(0.f, 0.f, 1.f);
        dirX = dirY % dirZ;
        dirX = hsFastMath::NormalizeAppr(dirX);
        dirY = dirZ % dirX;
    }
    else if( HasFlag(kPivotFavorY) )
    {
        dirY.Set(0.f, 1.f, 0.f);
        dirX = dirY % dirZ;
        dirX = hsFastMath::NormalizeAppr(dirX);
        dirY = dirZ % dirX;
    }
    else if( HasFlag(kPivotY) )
    {
        dirY.Set(0.f, 1.f, 0.f);
        dirX = dirY % dirZ;
        dirX = hsFastMath::NormalizeAppr(dirX);
        dirZ = dirX % dirY;
    }
    else if( HasFlag(kPivotTumble) )
    {
        dirY = fLastDirY;
        dirX = dirY % dirZ;
        dirX = hsFastMath::NormalizeAppr(dirX);
        dirY = dirZ % dirX;
        fLastDirY = dirY;
    }
    else
    {
        hsAssert(false, "I've no idea what you're getting at here in ViewFace land");
    }

    hsMatrix44 x;
    hsMatrix44 xInv;

    xInv.fMap[0][0] = x.fMap[0][0] = dirX[0];
    xInv.fMap[1][0] = x.fMap[0][1] = dirY[0];
    xInv.fMap[2][0] = x.fMap[0][2] = dirZ[0];
    xInv.fMap[3][0] = x.fMap[0][3] = 0;
    
    xInv.fMap[0][1] = x.fMap[1][0] = dirX[1];
    xInv.fMap[1][1] = x.fMap[1][1] = dirY[1];
    xInv.fMap[2][1] = x.fMap[1][2] = dirZ[1];
    xInv.fMap[3][1] = x.fMap[1][3] = 0;
    
    xInv.fMap[0][2] = x.fMap[2][0] = dirX[2];
    xInv.fMap[1][2] = x.fMap[2][1] = dirY[2];
    xInv.fMap[2][2] = x.fMap[2][2] = dirZ[2];
    xInv.fMap[3][2] = x.fMap[2][3] = 0;
    
    x.fMap[3][0] = x.fMap[3][1] = x.fMap[3][2] = 0;
    xInv.fMap[0][3] = xInv.fMap[1][3] = xInv.fMap[2][3] = 0;
    
    xInv.fMap[3][3] = x.fMap[3][3] = 1.f;
    
    x.NotIdentity();
    xInv.NotIdentity();

    if( HasFlag(kScale) )
    {
        x.fMap[0][0] *= fScale.fX;
        x.fMap[0][1] *= fScale.fX;
        x.fMap[0][2] *= fScale.fX;

        x.fMap[1][0] *= fScale.fY;
        x.fMap[1][1] *= fScale.fY;
        x.fMap[1][2] *= fScale.fY;

        x.fMap[2][0] *= fScale.fZ;
        x.fMap[2][1] *= fScale.fZ;
        x.fMap[2][2] *= fScale.fZ;

        float inv = 1.f / fScale.fX;
        xInv.fMap[0][0] *= inv;
        xInv.fMap[1][0] *= inv;
        xInv.fMap[2][0] *= inv;

        inv = 1.f / fScale.fY;
        xInv.fMap[0][1] *= inv;
        xInv.fMap[1][1] *= inv;
        xInv.fMap[2][1] *= inv;

        inv = 1.f / fScale.fZ;
        xInv.fMap[0][2] *= inv;
        xInv.fMap[1][2] *= inv;
        xInv.fMap[2][2] *= inv;
    }

    hsMatrix44 l2p = fOrigLocalToParent * x;
    hsMatrix44 p2l = xInv * fOrigParentToLocal;

    if( l2p != IGetTargetCoordinateInterface(0)->GetLocalToParent() ) // TERRORDAN
    {
        IGetTargetCoordinateInterface(0)->SetLocalToParent(l2p, p2l);
        IGetTargetCoordinateInterface(0)->FlushTransform(false);
    }

    return true;
}

bool plViewFaceModifier::MsgReceive(plMessage* msg)
{
    plRenderMsg* rend = plRenderMsg::ConvertNoRef(msg);

    if( rend )
    {
        plProfile_BeginLap(ViewFace, this->GetKey()->GetUoid().GetObjectName());

        if( HasFlag(kFaceCam) )
        {
            fFacePoint = rend->Pipeline()->GetViewPositionWorld();
            if( HasFlag(kOffset) )
            {
                if( HasFlag(kOffsetLocal) )
                {
                    fFacePoint += rend->Pipeline()->GetViewAcrossWorld() * fOffset.fX;
                    fFacePoint += rend->Pipeline()->GetViewUpWorld() * fOffset.fY;
                    fFacePoint += rend->Pipeline()->GetViewDirWorld() * fOffset.fZ;
                }
                else
                {
                    fFacePoint += fOffset;
                }
            }
        }
        else
        if( HasFlag(kFaceObj) )
        {
            if( !fFaceObj )
                return true;
            fFacePoint = fFaceObj->GetLocalToWorld().GetTranslate();
            if( HasFlag(kOffset) )
            {
                if( HasFlag(kOffsetLocal) )
                    fFacePoint += fFaceObj->GetLocalToWorld() * fOffset;
                else
                    fFacePoint += fOffset;
            }
        }

        IFacePoint(rend->Pipeline(), fFacePoint);
        
        plProfile_EndLap(ViewFace, this->GetKey()->GetUoid().GetObjectName());
        return true;
    }
    plArmatureUpdateMsg* armMsg = plArmatureUpdateMsg::ConvertNoRef(msg);
    if( armMsg && armMsg->IsLocal() )
    {
        const plSceneObject* head = armMsg->fArmature->FindBone(plAvBrainHuman::Head);
        if( head )
        {
            fFacePoint = head->GetLocalToWorld().GetTranslate();
            if( HasFlag(kOffset) )
            {
                if( HasFlag(kOffsetLocal) )
                    fFacePoint += head->GetLocalToWorld() * fOffset;
                else
                    fFacePoint += fOffset;
            }
        }

        return true;
    }
    plListenerMsg* list = plListenerMsg::ConvertNoRef(msg);
    if( list )
    {
        fFacePoint = list->GetPosition();

        if( HasFlag(kOffset) )
        {
            if( HasFlag(kOffsetLocal) )
            {
                fFacePoint += (list->GetDirection() % list->GetUp()) * fOffset.fX;
                fFacePoint += list->GetDirection() * fOffset.fY;
                fFacePoint += list->GetUp() * fOffset.fZ;
            }
            else
            {
                fFacePoint += fOffset;
            }
        }

        return true;
    }
    plGenRefMsg* refMsg = plGenRefMsg::ConvertNoRef(msg);
    if( refMsg )
    {
        if( refMsg->GetContext() & (plRefMsg::kOnCreate|plRefMsg::kOnRequest|plRefMsg::kOnReplace) )
            IOnReceive(refMsg);
        else
            IOnRemove(refMsg);
        return true;
    }
    return plSingleModifier::MsgReceive(msg);
}

void plViewFaceModifier::IOnReceive(plGenRefMsg* refMsg)
{
    switch(refMsg->fType)
    {
    case kRefFaceObj:
        fFaceObj = plSceneObject::ConvertNoRef(refMsg->GetRef());
        break;
    }
}

void plViewFaceModifier::IOnRemove(plGenRefMsg* refMsg)
{
    switch(refMsg->fType)
    {
    case kRefFaceObj:
        fFaceObj = nullptr;
        break;
    }
}

void plViewFaceModifier::ISetObject(const plKey& soKey)
{
    hsgResMgr::ResMgr()->SendRef(soKey, new plGenRefMsg(GetKey(), plRefMsg::kOnRequest, 0, kRefFaceObj), plRefFlags::kPassiveRef);
}

void plViewFaceModifier::SetFollowMode(FollowMode m, const plKey& soKey)
{
    ClearFlag(kFaceCam);
    ClearFlag(kFaceList);
    ClearFlag(kFacePlay);
    ClearFlag(kFaceObj);
    
    switch(m)
    {
    case kFollowCamera:
        SetFlag(kFaceCam);
        break;
    case kFollowListener:
        SetFlag(kFaceList);
        break;
    case kFollowPlayer:
        SetFlag(kFacePlay);
        break;
    case kFollowObject:
        SetFlag(kFaceObj);
        ISetObject(soKey);
        break;
    default:
        hsAssert(false, "Unknown follow mode");
        SetFlag(kFaceCam);
        break;
    }
}

plViewFaceModifier::FollowMode plViewFaceModifier::GetFollowMode() const
{
    if( HasFlag(kFaceCam) )
        return kFollowCamera;
    if( HasFlag(kFaceList) )
        return kFollowListener;
    if( HasFlag(kFacePlay) )
        return kFollowPlayer;
    if( HasFlag(kFaceObj) )
        return kFollowObject;

    hsAssert(false, "Have no follow mode");
    return kFollowCamera;

}

void plViewFaceModifier::SetOffset(const hsVector3& off, bool local)
{
    fOffset = off;
    if( local )
        SetFlag(kOffsetLocal);
    else
        ClearFlag(kOffsetLocal);
}
