/*==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 "plPointChannel.h"
#include "plScalarChannel.h"
#include "hsResMgr.h"

#include "pnSceneObject/plDrawInterface.h"
#include "pnSceneObject/plSimulationInterface.h"
#include "pnSceneObject/plCoordinateInterface.h"
#include "pnSceneObject/plAudioInterface.h"
#include "plInterp/plController.h"
#include "plInterp/plAnimTimeConvert.h"
#include "plGLight/plLightInfo.h"

//////////////
// PLPOINTSRCE
//////////////

// CTOR
plPointChannel::plPointChannel()
: plAGChannel()
{
}

// DTOR
plPointChannel::~plPointChannel()
{
}

// VALUE
// default behaviour is just to return our result (constant value)
const hsPoint3 & plPointChannel::Value(double time)
{
    return fResult;
}

// VALUE(point, time)
void plPointChannel::Value(hsPoint3 &point, double time)
{
    point = Value(time);
}

// MAKECOMBINE
plAGChannel * plPointChannel::MakeCombine(plAGChannel *channelA)
{
    return nullptr;
}

// MAKEBLEND
plAGChannel * plPointChannel::MakeBlend(plAGChannel * channelB, plScalarChannel * channelBias, int blendPriority)
{
    return new plPointBlend(this, (plPointChannel *)channelB, channelBias);
}

// MAKEZEROSTATE
plAGChannel * plPointChannel::MakeZeroState()
{
    return new plPointConstant(Value(0));
}

// MAKETIMESCALE
plAGChannel * plPointChannel::MakeTimeScale(plScalarChannel *timeSource)
{
    return new plPointTimeScale(this, timeSource);
}

/////////////////////////////////////////////////////////////////////////////////////////
//
// plPointConstant
//
/////////////////////////////////////////////////////////////////////////////////////////

// ctor --------------------------
// -----
plPointConstant::plPointConstant()
: plPointChannel()
{
}

// ctor -----------------------------------------------
// -----
plPointConstant::plPointConstant(const hsPoint3 &point)
{
    fResult = point;
}

// dtor ---------------------------
// -----
plPointConstant::~plPointConstant()
{
}

void plPointConstant::Read(hsStream *stream, hsResMgr *mgr)
{
    plPointChannel::Read(stream, mgr);
    fResult.Read(stream);
}

void plPointConstant::Write(hsStream *stream, hsResMgr *mgr)
{
    plPointChannel::Write(stream, mgr);
    fResult.Write(stream);
}

/////////////////////////////////////////////////////////////////////////////////////////
//
// PLPOINTTIMESCALE
//
// Insert into the graph when you need to change the speed or direction of time
// Also serves as a handy instancing node, since it just passes its data through.
//
/////////////////////////////////////////////////////////////////////////////////////////

// ctor ----------------------------
// -----
plPointTimeScale::plPointTimeScale()
: fTimeSource(), fChannelIn()
{
}

// ctor --------------------------------------------------------------------------------
// -----
plPointTimeScale::plPointTimeScale(plPointChannel *channel, plScalarChannel *timeSource)
: fChannelIn(channel),
  fTimeSource(timeSource)
{
}

// dtor -----------------------------
// -----
plPointTimeScale::~plPointTimeScale()
{
}

// IsStoppedAt ---------------------------
// ------------
bool plPointTimeScale::IsStoppedAt(double time)
{
    return fTimeSource->IsStoppedAt(time);
}

// Value --------------------------------------------
// ------
const hsPoint3 & plPointTimeScale::Value(double time)
{
    fResult = fChannelIn->Value(fTimeSource->Value(time));

    return fResult;
}

// Detach ---------------------------------------------------
// -------
plAGChannel * plPointTimeScale::Detach(plAGChannel * channel)
{
    plAGChannel *result = this;
    
    fChannelIn = plPointChannel::ConvertNoRef(fChannelIn->Detach(channel));
    
    if(!fChannelIn || channel == this)
        result = nullptr;
    
    if(result != this)
        delete this;
    
    return result;
    
}

/////////////////////////////////////////////////////////////////////////////////////////
//
// plPointBlend
//
/////////////////////////////////////////////////////////////////////////////////////////

// ctor --------------------
// -----
plPointBlend::plPointBlend()
: fPointA(nullptr),
  fPointB(nullptr),
  fChannelBias(nullptr)
{
}

// ctor ---------------------------------------------------------------------------------
// -----
plPointBlend::plPointBlend(plPointChannel *channelA, plPointChannel *channelB,
                           plScalarChannel *channelBias)
: fPointA(channelA),
  fPointB(channelB),
  fChannelBias(channelBias)
{
}

// dtor ---------------------
// -----
plPointBlend::~plPointBlend()
{
    fPointA = nullptr;
    fPointB = nullptr;
    fChannelBias = nullptr;
}

// IsStoppedAt ------------------------------
// ------------
bool plPointBlend::IsStoppedAt(double time)
{
    float blend = fChannelBias->Value(time);
    if (blend == 0)
        return fPointA->IsStoppedAt(time);
    if (blend == 1)
        return fPointB->IsStoppedAt(time);

    return (fPointA->IsStoppedAt(time) && fPointB->IsStoppedAt(time));
}

// Value ---------------------------------------
// ------
const hsPoint3 &plPointBlend::Value(double time)
{
    if (fPointA && fPointB)
    {
        float curBlend = fChannelBias->Value(time);
        if(curBlend == 0) {
            fPointA->Value(fResult, time);
        } else {
            if(curBlend == 1) {
                fPointB->Value(fResult, time);
            } else {
                const hsPoint3 &pointA = fPointA->Value(time);
                const hsPoint3 &pointB = fPointB->Value(time);
                hsPoint3 difference = pointB - pointA;

                difference *= curBlend;
    
                fResult = pointA + difference;
            }
        }
    } else {
        if (fPointA) {
            fResult = fPointA->Value(time);
        } else if (fPointB) {
            fResult = fPointB->Value(time);
        }
    }
    return fResult;
}

// Detach ------------------------------------------------------
// -------
plAGChannel * plPointBlend::Detach(plAGChannel *remove)
{
    plAGChannel *result = this;

    if (remove == this)
    {
        result = nullptr;
    } else  {
        // it's possible that the incoming channel could reside down *all* of our
        // branches (it's a graph, not a tree,) so we always pass down all limbs
        fChannelBias = plScalarChannel::ConvertNoRef(fChannelBias->Detach(remove));
        fPointA = plPointChannel::ConvertNoRef(fPointA->Detach(remove));
        fPointB = plPointChannel::ConvertNoRef(fPointB->Detach(remove));
        if (!fChannelBias)
        {
            // No more bias channel, assume it's zero from now on, (a.k.a. We just want channelA)
            result = fPointA;
        }
        else
        {
            if(!fChannelBias)
                result = fPointA;
            else if(fPointA && !fPointB)
                result = fPointA;
            else if(fPointB && !fPointA)
                result = fPointB;
            else if(!fPointA && !fPointB)
                result = nullptr;
            if(result != this)
            {
                delete this;
            }
        }
    }
    return result;
}

///////////////////////////
// PLPOINTCONTROLLERCHANNEL
///////////////////////////

// CTOR
plPointControllerChannel::plPointControllerChannel()
: fController()
{
}

// CTOR(name, controller)
plPointControllerChannel::plPointControllerChannel(plController *controller)
: fController(controller)
{
}

// ~DTOR()
plPointControllerChannel::~plPointControllerChannel()
{
    if(fController) {
        delete fController;
        fController = nullptr;
    }
}

// VALUE(time)
const hsPoint3 & plPointControllerChannel::Value(double time)
{
    return Value(time, nullptr);
}

// VALUE(time)
const hsPoint3 & plPointControllerChannel::Value(double time, plControllerCacheInfo *cache)
{
    fController->Interp((float)time, &fResult, cache);
    return fResult;
}

plAGChannel *plPointControllerChannel::MakeCacheChannel(plAnimTimeConvert *atc)
{
    plControllerCacheInfo *cache = fController->CreateCache();
    cache->SetATC(atc);
    return new plPointControllerCacheChannel(this, cache);
}

// WRITE(stream, mgr)
void plPointControllerChannel::Write(hsStream *stream, hsResMgr *mgr)
{
    plPointChannel::Write(stream, mgr);

    hsAssert(fController, "Trying to write plPointControllerChannel with nil controller. File will not be importable.");
    mgr->WriteCreatable(stream, fController);
}

// READ(stream, mgr)
void plPointControllerChannel::Read(hsStream *stream, hsResMgr *mgr)
{
    plPointChannel::Read(stream, mgr);
    
    fController = plController::ConvertNoRef(mgr->ReadCreatable(stream));
}

/////////////////////////////////
// PLPOINTCONTROLLERCACHECHANNEL
/////////////////////////////////

// CTOR
plPointControllerCacheChannel::plPointControllerCacheChannel()
: fControllerChannel(),
  fCache()
{
}

// CTOR(name, controller)
plPointControllerCacheChannel::plPointControllerCacheChannel(plPointControllerChannel *controller, plControllerCacheInfo *cache)
: fControllerChannel(controller),
  fCache(cache)
{
}

// ~DTOR()
plPointControllerCacheChannel::~plPointControllerCacheChannel()
{
    delete fCache;
    fControllerChannel = nullptr;
}

// VALUE(time)
const hsPoint3 & plPointControllerCacheChannel::Value(double time, bool peek)
{
    return fControllerChannel->Value(time, fCache);
}

// DETACH
plAGChannel * plPointControllerCacheChannel::Detach(plAGChannel * channel)
{
    if(channel == this)
    {
        return nullptr;
    } else {
        plAGChannel *result = fControllerChannel->Detach(channel);
        
        if(result == fControllerChannel)
        {
            return this;
        } else {
            // if our controller channel has been detached, then detach ourselves as well.
            return result;
        }
    }
}

//////////////////////////////////////////////////////////////////////////////////////////////////
//
// Channel applicators

void plPointChannelApplicator::IApply(const plAGModifier *modifier, double time)
{
    plPointChannel *pointChan = plPointChannel::ConvertNoRef(fChannel);
    hsAssert(pointChan, "Invalid channel given to plPointChannelApplicator");

    plCoordinateInterface *CI = IGetCI(modifier);

    hsMatrix44 l2p = CI->GetLocalToParent();
    const hsPoint3 &point = pointChan->Value(time);

    l2p.SetTranslate(&point);
    
    hsMatrix44 p2l;
    l2p.GetInverse(&p2l);
    CI->SetLocalToParent(l2p, p2l);
}

void plLightDiffuseApplicator::IApply(const plAGModifier *modifier, double time)
{
    plPointChannel *pointChan = plPointChannel::ConvertNoRef(fChannel);
    hsAssert(pointChan, "Invalid channel given to plLightDiffuseApplicator");

    plLightInfo *li = plLightInfo::ConvertNoRef(IGetGI(modifier, plLightInfo::Index()));

    const hsPoint3 &point = pointChan->Value(time);
    hsColorRGBA color;
    color.Set(point.fX, point.fY, point.fZ, 1.0f);
    li->SetDiffuse(color);
}

void plLightAmbientApplicator::IApply(const plAGModifier *modifier, double time)
{
    plPointChannel *pointChan = plPointChannel::ConvertNoRef(fChannel);
    hsAssert(pointChan, "Invalid channel given to plLightAmbientApplicator");

    plLightInfo *li = plLightInfo::ConvertNoRef(IGetGI(modifier, plLightInfo::Index()));

    const hsPoint3 &point = pointChan->Value(time);
    hsColorRGBA color;
    color.Set(point.fX, point.fY, point.fZ, 1.0f);
    li->SetAmbient(color);
}

void plLightSpecularApplicator::IApply(const plAGModifier *modifier, double time)
{
    plPointChannel *pointChan = plPointChannel::ConvertNoRef(fChannel);
    hsAssert(pointChan, "Invalid channel given to plLightSpecularApplicator");

    plLightInfo *li = plLightInfo::ConvertNoRef(IGetGI(modifier, plLightInfo::Index()));

    const hsPoint3 &point = pointChan->Value(time);
    hsColorRGBA color;
    color.Set(point.fX, point.fY, point.fZ, 1.0f);
    li->SetSpecular(color);
}


