/*==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
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*==LICENSE==*/
#include "plQuatChannel.h"
#include "plPointChannel.h"
#include "plMatrixChannel.h"

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

#include "hsMatrix44.h"

////////////////
// PLQUATCHANNEL
////////////////

// CTOR
plQuatChannel::plQuatChannel()
: plAGChannel()
{
	fResult.Identity();
}

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

// VALUE (time)
const hsQuat &plQuatChannel::Value(double time)
{
	return fResult;
}

// VALUE (quaternion, time)
void plQuatChannel::Value(hsQuat &quat, double time)
{
	quat = Value(time);
}

// CANCOMBINE
hsBool plQuatChannel::CanCombine(plAGChannel *channelA)
{
	return false;
	if(plPointChannel::ConvertNoRef(channelA))
	{
		return true;
	} else {
		return false;
	}
}

// MAKECOMBINE
plAGChannel * plQuatChannel::MakeCombine(plAGChannel *channelA)
{
	if(plPointChannel::ConvertNoRef(channelA))
	{
		return TRACKED_NEW plQuatPointCombine(this, (plPointChannel *)channelA);
	} else {
		return nil;
	}
}

// MAKEBLEND
plAGChannel *plQuatChannel::MakeBlend(plAGChannel *channelB, plScalarChannel *channelBias, int blendPriority)
{
	plQuatChannel *chanB = plQuatChannel::ConvertNoRef(channelB);
	plScalarChannel *chanBias = plScalarChannel::ConvertNoRef(channelBias);
	if(chanB && chanBias)
	{
		return TRACKED_NEW plQuatBlend(this, chanB, chanBias);
	} else {
		hsStatusMessageF("Blend operation failed.");
		return this;
	}
}

// MAKEZEROSTATE
plAGChannel * plQuatChannel::MakeZeroState()
{
	return TRACKED_NEW plQuatConstant(Value(0));
}

// MAKETIMESCALE
plAGChannel * plQuatChannel::MakeTimeScale(plScalarChannel *timeSource)
{
	return TRACKED_NEW plQuatTimeScale(this, timeSource);
}

/////////////////
// PLQUATCONSTANT
/////////////////

// CTOR
plQuatConstant::plQuatConstant()
: plQuatChannel()
{
}

// CTOR(name, quaternion)
plQuatConstant::plQuatConstant(const hsQuat &quaternion)
{
	fResult = quaternion;
}

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

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

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

////////////////////
// PLQUATTIMESCALE
////////////////////
// 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
plQuatTimeScale::plQuatTimeScale()
: fTimeSource(nil),
  fChannelIn(nil)
{
}

// CTOR (channel, converter)
plQuatTimeScale::plQuatTimeScale(plQuatChannel *channel, plScalarChannel *timeSource)
: fChannelIn(channel),
  fTimeSource(timeSource)
{
}

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

hsBool plQuatTimeScale::IsStoppedAt(double time)
{
	return fTimeSource->IsStoppedAt(time);
}

// VALUE
const hsQuat & plQuatTimeScale::Value(double time)
{
	fResult = fChannelIn->Value(fTimeSource->Value(time));

	return fResult;
}

// DETACH
plAGChannel * plQuatTimeScale::Detach(plAGChannel * channel)
{
	plAGChannel *result = this;

	fChannelIn = plQuatChannel::ConvertNoRef(fChannelIn->Detach(channel));

	if(!fChannelIn || channel == this)
		result = nil;

	if (result != this)
		delete this;

	return result;
}

//////////////
// PLQUATBLEND
//////////////

// CTOR
plQuatBlend::plQuatBlend()
: fQuatA(nil),
  fQuatB(nil),
  fChannelBias(nil)
{
}

// CTOR(channelA, channelB, blend)
plQuatBlend::plQuatBlend(plQuatChannel *channelA, plQuatChannel *channelB, plScalarChannel *channelBias)
: fQuatA(channelA),
  fQuatB(channelB),
  fChannelBias(channelBias)
{
}

// DTOR
plQuatBlend::~plQuatBlend()
{
	//if (fQuatA) delete fQuatA;
	//if (fQuatB) delete fQuatB;
	fQuatA = fQuatB = nil;
	fChannelBias = nil;
}

hsBool plQuatBlend::IsStoppedAt(double time)
{
	hsScalar blend = fChannelBias->Value(time);
	if (blend == 0)
		return fQuatA->IsStoppedAt(time);
	if (blend == 1)
		return fQuatB->IsStoppedAt(time);

	return (fQuatA->IsStoppedAt(time) && fQuatB->IsStoppedAt(time));
}

// VALUE(time)
const hsQuat &plQuatBlend::Value(double time)
{
	hsQuat quatA = fQuatA->Value(time);
	hsQuat quatB = fQuatB->Value(time);

	fResult.SetFromSlerp(quatA, quatB, fChannelBias->Value(time));

	return fResult;
}


// REMOVE
// Remove the given channel wherever it may be in the graph (including this node)
plAGChannel * plQuatBlend::Detach(plAGChannel *remove)
{
	plAGChannel *result = this;

	hsAssert(remove != this, "Cannot remove blenders explicitly. Remove blended source instead.");

	if (remove != this)
	{
		fChannelBias = plScalarChannel::ConvertNoRef(fChannelBias->Detach(remove));
		if (!fChannelBias)
		{
			// No more bias channel, assume it's zero from now on, (a.k.a. We just want channelA)
			result = fQuatA;
		}
		else
		{
			fQuatA = (plQuatChannel *)fQuatA->Detach(remove);
			if(fQuatA)
			{
				// channel a still here(although children may be gone); try channel b
				fQuatB = (plQuatChannel *)fQuatB->Detach(remove);

				if(!fQuatB)
				{
					result = fQuatA;	// channel b is gone: return channel a as blender's replacement
				}
			} else {
				result = fQuatB;		// channel a is gone: return channel b
			}

			if (result != this)
			{
				delete this;			// lost one of our channels: kill the blender.
			}
		}
	}
	return result;
}

//////////////////////////////////////////////////////////////////////////////////////
// Applicators

void plQuatChannelApplicator::IApply(const plAGModifier *mod, double time)
{
	plQuatChannel *quatChan = plQuatChannel::ConvertNoRef(fChannel);
	hsAssert(quatChan, "Invalid channel in plQuatChannelApplicator");

	const hsQuat &rotate = quatChan->Value(time);

	plCoordinateInterface *CI = IGetCI(mod);

	hsMatrix44 l2w;
	hsMatrix44 w2l;

	rotate.MakeMatrix(&l2w);
	l2w.GetInverse(&w2l);

	CI->SetLocalToParent(l2w, w2l);
}