/*==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/>.

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 "hsTypes.h"
#include "plVisMgr.h"

#include "plVisRegion.h"

hsBitVector plVisMgr::fIdxSet;
hsBitVector plVisMgr::fIdxNot;

plVisMgr::plVisMgr()
:	fMaxSet(kCharacter),
	fMaxNot(-1)
{
	ResetNormal();
}

plVisMgr::~plVisMgr()
{
}

hsBool plVisMgr::MsgReceive(plMessage* msg)
{

	return hsKeyedObject::MsgReceive(msg);
}

void plVisMgr::Read(hsStream* s, hsResMgr* mgr)
{
	hsKeyedObject::Read(s, mgr);

}

void plVisMgr::Write(hsStream* s, hsResMgr* mgr)
{
	hsKeyedObject::Write(s, mgr);
}

void plVisMgr::Register(plVisRegion* reg, hsBool not)
{
	// This should happen pretty infrequently, or
	// I wouldn't be doing it so cloth-headed-ly.
	hsTArray<plVisRegion*>& regions = not ? fNotRegions : fRegions;
	hsBitVector& indices = not ? fIdxNot : fIdxSet;
	int& maxIdx = not ? fMaxNot : fMaxSet;
	int i;
	for( i = kNumReserved; ; i++ )
	{
		if( !indices.IsBitSet(i) )
		{
			if( i > maxIdx )
				maxIdx = i;

			indices.SetBit(i);
			reg->SetIndex(i);
			regions.Append(reg);
			return;
		}
	}
	hsAssert(false, "Infinite bitvector has all bits set?");
}

void plVisMgr::UnRegister(plVisRegion* reg, hsBool not)
{
	// Mark our index for recycling
	hsBitVector& indices= not ? fIdxNot : fIdxSet;
	indices.ClearBit(reg->GetIndex());

	// Nuke the region from our list.
	hsTArray<plVisRegion*>& regions = not ? fNotRegions : fRegions;
	int idx = regions.Find(reg);
	if( regions.kMissingIndex != idx )
		regions.Remove(idx);
}

void plVisMgr::Eval(const hsPoint3& pos)
{
	fVisSet = fOnBitSet;

	int i;
	for( i = 0; i < fRegions.GetCount(); i++ )
	{
		hsAssert(fRegions[i], "Nil region in list");
		if( !fOffBitSet.IsBitSet(fRegions[i]->GetIndex()) )
		{
			if( fRegions[i]->Eval(pos) )
			{
				fVisSet.SetBit(fRegions[i]->GetIndex());
				if( fRegions[i]->DisableNormal() )
				{
					fVisSet.ClearBit(kNormal);
					fVisSet.SetBit(kCharacter);
				}
			}
		}
	}

	fVisNot = fOnBitNot;

	for( i = 0; i < fNotRegions.GetCount(); i++ )
	{
		hsAssert(fNotRegions[i], "Nil region in list");
		if( !fOffBitNot.IsBitSet(fNotRegions[i]->GetIndex()) )
		{
			if( fNotRegions[i]->Eval(pos) )
			{
				fVisNot.SetBit(fNotRegions[i]->GetIndex());
			}
		}
	}

	ResetNormal();
}

void plVisMgr::ResetNormal()
{
	fOnBitSet.Clear();
	fOnBitSet.SetBit(kNormal);

	fOffBitSet.Clear();
	fOnBitNot.Clear();
	fOffBitNot.Clear();
}

void plVisMgr::DisableNormal()
{
	fOnBitSet.Clear();
	if( fMaxSet > 0 )
		fOffBitSet.Set(fMaxSet);

	fOnBitNot.Clear();
	if( fMaxNot > 0 )
		fOffBitNot.Set(fMaxNot);
}

void plVisMgr::EnableVisSet(int idx, hsBool isNot)
{
	hsBitVector& offs = isNot ? fOffBitNot : fOffBitSet;

	offs.ClearBit(idx);
}

void plVisMgr::EnableVisSets(const hsBitVector& enabled, hsBool isNot)
{
	hsBitVector& offs = isNot ? fOffBitNot : fOffBitSet;
	offs -= enabled;
}

void plVisMgr::ForceVisSet(int idx, hsBool isNot)
{
	EnableVisSet(idx, isNot);
	hsBitVector& ons = isNot ? fOnBitNot : fOnBitSet;
	ons.SetBit(idx);
}

void plVisMgr::ForceVisSets(const hsBitVector& enabled, hsBool isNot)
{
	EnableVisSets(enabled, isNot);
	hsBitVector& ons = isNot ? fOnBitNot : fOnBitSet;
	ons |= enabled;
}

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

plVisMgr* plGlobalVisMgr::fInstance = nil;

void plGlobalVisMgr::Init()
{
	fInstance = TRACKED_NEW plVisMgr;
	fInstance->RegisterAs(kGlobalVisMgr_KEY);
}

void plGlobalVisMgr::DeInit()
{
	if (fInstance)
	{
		fInstance->UnRegisterAs(kGlobalVisMgr_KEY);
		fInstance = nil;
	}
}