//-----------------------------------------------------------------------------
// Purpose: Used at level change and round start to re-calculate which holiday is active
//-----------------------------------------------------------------------------
void UTIL_CalculateHolidays()
{
	s_HolidaysActive.ClearAll();

	CRTime::UpdateRealTime();
	for ( int iHoliday = 0; iHoliday < kHolidayCount; iHoliday++ )
	{
		if ( EconHolidays_IsHolidayActive( iHoliday, CRTime::RTime32TimeCur() ) )
		{
			s_HolidaysActive.Set( iHoliday );
		}
	}

	s_HolidaysCalculated = true;
}
void CLagCompensationManager::BacktrackEntity( CAI_BaseNPC *pEntity, float flTargetTime )
{
	Vector org, mins, maxs;
	QAngle ang;

	VPROF_BUDGET( "BacktrackEntity", "CLagCompensationManager" );

	// get track history of this entity
	int index = pEntity->GetAIIndex();
	CUtlFixedLinkedList< LagRecord > *track = &m_EntityTrack[ index ];

	// check if we have at leat one entry
	if ( track->Count() <= 0 )
		return;

	int curr = track->Head();

	LagRecord *prevRecord = NULL;
	LagRecord *record = NULL;

	Vector prevOrg = pEntity->GetLocalOrigin();
	
	// Walk context looking for any invalidating event
	while( track->IsValidIndex(curr) )
	{
		// remember last record
		prevRecord = record;

		// get next record
		record = &track->Element( curr );

		if ( !(record->m_fFlags & LC_ALIVE) )
		{
			// entity must be alive, lost track
			return;
		}

		Vector delta = record->m_vecOrigin - prevOrg;
		if ( delta.LengthSqr() > LAG_COMPENSATION_TELEPORTED_DISTANCE_SQR )
		{
			// lost track, moved too far (may have teleported)
			return; 
		}

		// did we find a context smaller than target time ?
		if ( record->m_flSimulationTime <= flTargetTime )
			break; // hurra, stop

		prevOrg = record->m_vecOrigin;

		// go one step back in time
		curr = track->Next( curr );
	}

	Assert( record );

	if ( !record )
	{
		if ( sv_unlag_debug.GetBool() )
		{
			DevMsg( "No valid positions in history for BacktrackEntity ( %s )\n", pEntity->GetClassname() );
		}

		return; // that should never happen
	}

	float frac = 0.0f;
	if ( prevRecord && 
		 (record->m_flSimulationTime < flTargetTime) &&
		 (record->m_flSimulationTime < prevRecord->m_flSimulationTime) )
	{
		// we didn't find the exact time but have a valid previous record
		// so interpolate between these two records;

		Assert( prevRecord->m_flSimulationTime > record->m_flSimulationTime );
		Assert( flTargetTime < prevRecord->m_flSimulationTime );

		// calc fraction between both records
		frac = ( flTargetTime - record->m_flSimulationTime ) / 
			( prevRecord->m_flSimulationTime - record->m_flSimulationTime );

		Assert( frac > 0 && frac < 1 ); // should never extrapolate

		ang  = Lerp( frac, record->m_vecAngles, prevRecord->m_vecAngles );
		org  = Lerp( frac, record->m_vecOrigin, prevRecord->m_vecOrigin  );
		mins = Lerp( frac, record->m_vecMins, prevRecord->m_vecMins  );
		maxs = Lerp( frac, record->m_vecMaxs, prevRecord->m_vecMaxs );
	}
	else
	{
		// we found the exact record or no other record to interpolate with
		// just copy these values since they are the best we have
		ang  = record->m_vecAngles;
		org  = record->m_vecOrigin;
		mins = record->m_vecMins;
		maxs = record->m_vecMaxs;
	}

	// See if this is still a valid position for us to teleport to
	if ( sv_unlag_fixstuck.GetBool() )
	{
		// Try to move to the wanted position from our current position.
		trace_t tr;
		UTIL_TraceEntity( pEntity, org, org, MASK_NPCSOLID, &tr );
		if ( tr.startsolid || tr.allsolid )
		{
			if ( sv_unlag_debug.GetBool() )
				DevMsg( "WARNING: BackupEntity trying to back entity into a bad position - %s\n", pEntity->GetClassname() );

			CBasePlayer *pHitPlayer = dynamic_cast<CBasePlayer *>( tr.m_pEnt );

			// don't lag compensate the current player
			if ( pHitPlayer && ( pHitPlayer != m_pCurrentPlayer ) )	
			{
				// If we haven't backtracked this player, do it now
				// this deliberately ignores WantsLagCompensationOnEntity.
				if ( !m_RestorePlayer.Get( pHitPlayer->entindex() - 1 ) )
				{
					// prevent recursion - save a copy of m_RestorePlayer,
					// pretend that this player is off-limits
					int pl_index = pEntity->entindex() - 1;

					// Temp turn this flag on
					m_RestorePlayer.Set( pl_index );

					BacktrackPlayer( pHitPlayer, flTargetTime );

					// Remove the temp flag
					m_RestorePlayer.Clear( pl_index );
				}				
			}
			else
			{
				CAI_BaseNPC *pHitEntity = dynamic_cast<CAI_BaseNPC *>( tr.m_pEnt );
				if ( pHitEntity )
				{
					CAI_BaseNPC *pNPC = NULL;
					CAI_BaseNPC **ppAIs = g_AI_Manager.AccessAIs();
					int nAIs = g_AI_Manager.NumAIs();
					for ( int i = 0; i < nAIs; i++ ) // we'll have to find this entity's index though :(
					{
						pNPC = ppAIs[i];
						if ( pNPC == pHitEntity )
							break;
					}
					// If we haven't backtracked this player, do it now
					// this deliberately ignores WantsLagCompensationOnEntity.
					if ( pNPC && !m_RestoreEntity.Get( pNPC->GetAIIndex() ) )
					{
						// prevent recursion - save a copy of m_RestoreEntity,
						// pretend that this player is off-limits

						// Temp turn this flag on
						m_RestoreEntity.Set( pNPC->GetAIIndex() );

						BacktrackEntity( pHitEntity, flTargetTime );

						// Remove the temp flag
						m_RestoreEntity.Clear( pNPC->GetAIIndex() );
					}
				}
			}

			// now trace us back as far as we can go
			UTIL_TraceEntity( pEntity, pEntity->GetLocalOrigin(), org, MASK_NPCSOLID, &tr );

			if ( tr.startsolid || tr.allsolid )
			{
				// Our starting position is bogus

				if ( sv_unlag_debug.GetBool() )
					DevMsg( "Backtrack failed completely, bad starting position\n" );
			}
			else
			{
				// We can get to a valid place, but not all the way to the target
				Vector vPos;
				VectorLerp( pEntity->GetLocalOrigin(), org, tr.fraction * g_flFractionScale, vPos );
				
				// This is as close as we're going to get
				org = vPos;

				if ( sv_unlag_debug.GetBool() )
					DevMsg( "Backtrack got most of the way\n" );
			}
		}
	}
	
	// See if this represents a change for the entity
	int flags = 0;
	LagRecord *restore = &m_EntityRestoreData[ index ];
	LagRecord *change  = &m_EntityChangeData[ index ];

	QAngle angdiff = pEntity->GetLocalAngles() - ang;
	Vector orgdiff = pEntity->GetLocalOrigin() - org;

	// Always remember the pristine simulation time in case we need to restore it.
	restore->m_flSimulationTime = pEntity->GetSimulationTime();

	if ( angdiff.LengthSqr() > LAG_COMPENSATION_EPS_SQR )
	{
		flags |= LC_ANGLES_CHANGED;
		restore->m_vecAngles = pEntity->GetLocalAngles();
		pEntity->SetLocalAngles( ang );
		change->m_vecAngles = ang;
	}

	// Use absolute equality here
	if ( ( mins != pEntity->WorldAlignMins() ) ||
		 ( maxs != pEntity->WorldAlignMaxs() ) )
	{
		flags |= LC_SIZE_CHANGED;
		restore->m_vecMins = pEntity->WorldAlignMins() ;
		restore->m_vecMaxs = pEntity->WorldAlignMaxs();
		pEntity->SetSize( mins, maxs );
		change->m_vecMins = mins;
		change->m_vecMaxs = maxs;
	}

	// Note, do origin at end since it causes a relink into the k/d tree
	if ( orgdiff.LengthSqr() > LAG_COMPENSATION_EPS_SQR )
	{
		flags |= LC_ORIGIN_CHANGED;
		restore->m_vecOrigin = pEntity->GetLocalOrigin();
		pEntity->SetLocalOrigin( org );
		change->m_vecOrigin = org;
	}

	// Sorry for the loss of the optimization for the case of people
	// standing still, but you breathe even on the server.
	// This is quicker than actually comparing all bazillion floats.
	flags |= LC_ANIMATION_CHANGED;
	restore->m_masterSequence = pEntity->GetSequence();
	restore->m_masterCycle = pEntity->GetCycle();

	bool interpolationAllowed = false;
	if( prevRecord && (record->m_masterSequence == prevRecord->m_masterSequence) )
	{
		// If the master state changes, all layers will be invalid too, so don't interp (ya know, interp barely ever happens anyway)
		interpolationAllowed = true;
	}
	
	////////////////////////
	// First do the master settings
	bool interpolatedMasters = false;
	if( frac > 0.0f && interpolationAllowed )
	{
		interpolatedMasters = true;
		pEntity->SetSequence( Lerp( frac, record->m_masterSequence, prevRecord->m_masterSequence ) );
		pEntity->SetCycle( Lerp( frac, record->m_masterCycle, prevRecord->m_masterCycle ) );

		if( record->m_masterCycle > prevRecord->m_masterCycle )
		{
			// the older record is higher in frame than the newer, it must have wrapped around from 1 back to 0
			// add one to the newer so it is lerping from .9 to 1.1 instead of .9 to .1, for example.
			float newCycle = Lerp( frac, record->m_masterCycle, prevRecord->m_masterCycle + 1 );
			pEntity->SetCycle(newCycle < 1 ? newCycle : newCycle - 1 );// and make sure .9 to 1.2 does not end up 1.05
		}
		else
		{
			pEntity->SetCycle( Lerp( frac, record->m_masterCycle, prevRecord->m_masterCycle ) );
		}
	}
	if( !interpolatedMasters )
	{
		pEntity->SetSequence(record->m_masterSequence);
		pEntity->SetCycle(record->m_masterCycle);
	}

	////////////////////////
	// Now do all the layers
	int layerCount = pEntity->GetNumAnimOverlays();
	for( int layerIndex = 0; layerIndex < layerCount; ++layerIndex )
	{
		CAnimationLayer *currentLayer = pEntity->GetAnimOverlay(layerIndex);
		if( currentLayer )
		{
			restore->m_layerRecords[layerIndex].m_cycle = currentLayer->m_flCycle;
			restore->m_layerRecords[layerIndex].m_order = currentLayer->m_nOrder;
			restore->m_layerRecords[layerIndex].m_sequence = currentLayer->m_nSequence;
			restore->m_layerRecords[layerIndex].m_weight = currentLayer->m_flWeight;

			bool interpolated = false;
			if( (frac > 0.0f)  &&  interpolationAllowed )
			{
				LayerRecord &recordsLayerRecord = record->m_layerRecords[layerIndex];
				LayerRecord &prevRecordsLayerRecord = prevRecord->m_layerRecords[layerIndex];
				if( (recordsLayerRecord.m_order == prevRecordsLayerRecord.m_order)
					&& (recordsLayerRecord.m_sequence == prevRecordsLayerRecord.m_sequence)
					)
				{
					// We can't interpolate across a sequence or order change
					interpolated = true;
					if( recordsLayerRecord.m_cycle > prevRecordsLayerRecord.m_cycle )
					{
						// the older record is higher in frame than the newer, it must have wrapped around from 1 back to 0
						// add one to the newer so it is lerping from .9 to 1.1 instead of .9 to .1, for example.
						float newCycle = Lerp( frac, recordsLayerRecord.m_cycle, prevRecordsLayerRecord.m_cycle + 1 );
						currentLayer->m_flCycle = newCycle < 1 ? newCycle : newCycle - 1;// and make sure .9 to 1.2 does not end up 1.05
					}
					else
					{
						currentLayer->m_flCycle = Lerp( frac, recordsLayerRecord.m_cycle, prevRecordsLayerRecord.m_cycle  );
					}
					currentLayer->m_nOrder = recordsLayerRecord.m_order;
					currentLayer->m_nSequence = recordsLayerRecord.m_sequence;
					currentLayer->m_flWeight = Lerp( frac, recordsLayerRecord.m_weight, prevRecordsLayerRecord.m_weight  );
				}
			}
			if( !interpolated )
			{
				//Either no interp, or interp failed.  Just use record.
				currentLayer->m_flCycle = record->m_layerRecords[layerIndex].m_cycle;
				currentLayer->m_nOrder = record->m_layerRecords[layerIndex].m_order;
				currentLayer->m_nSequence = record->m_layerRecords[layerIndex].m_sequence;
				currentLayer->m_flWeight = record->m_layerRecords[layerIndex].m_weight;
			}
		}
	}
	
	if ( !flags )
		return; // we didn't change anything

	if ( sv_lagflushbonecache.GetBool() )
		pEntity->InvalidateBoneCache();

	/*char text[256]; Q_snprintf( text, sizeof(text), "time %.2f", flTargetTime );
	pEntity->DrawServerHitboxes( 10 );
	NDebugOverlay::Text( org, text, false, 10 );
	NDebugOverlay::EntityBounds( pEntity, 255, 0, 0, 32, 10 ); */

	m_RestoreEntity.Set( index ); //remember that we changed this entity
	m_bNeedToRestore = true;  // we changed at least one player / entity
	restore->m_fFlags = flags; // we need to restore these flags
	change->m_fFlags = flags; // we have changed these flags

	if( sv_showlagcompensation.GetInt() == 1 )
	{
		pEntity->DrawServerHitboxes(4, true);
	}
}
bool _ComputeRagdollBones( const ragdoll_t *pRagdoll, matrix3x4_t &parentTransform, matrix3x4_t *pBones, Vector *pPositions, QAngle *pAngles )
{
	matrix3x4_t inverted, output;

#ifdef _DEBUG
	CBitVec<MAXSTUDIOBONES> vBonesComputed;
	vBonesComputed.ClearAll();
#endif

	for ( int i = 0; i < pRagdoll->listCount; ++i )
	{
		const ragdollelement_t& element = pRagdoll->list[ i ];

		// during restore if a model has changed since the file was saved, this could be NULL
		if ( !element.pObject )
			return false;

		int const boneIndex = pRagdoll->boneIndex[ i ];
		if ( boneIndex < 0 )
		{
			AssertMsg( 0, "Replay: No mapping for ragdoll bone\n" );
			return false;
		}

		// Get global transform and put it into the bone cache
		element.pObject->GetPositionMatrix( &pBones[ boneIndex ] );

		// Ensure a fixed translation from the parent (no stretching)
		if ( element.parentIndex >= 0 && !pRagdoll->allowStretch )
		{
			int parentIndex = pRagdoll->boneIndex[ element.parentIndex ];

#ifdef _DEBUG
			// Make sure we computed the parent already
			Assert( vBonesComputed.IsBitSet(parentIndex) );
#endif

			// overwrite the position from physics to force rigid attachment
			// NOTE: On the client we actually override this with the proper parent bone in each LOD
			Vector out;
			VectorTransform( element.originParentSpace, pBones[ parentIndex ], out );
			MatrixSetColumn( out, 3, pBones[ boneIndex ] );

			MatrixInvert( pBones[ parentIndex ], inverted );
		}
		else if ( element.parentIndex == - 1 )
		{
			// Decompose into parent space
			MatrixInvert( parentTransform, inverted );
		}

#ifdef _DEBUG
		vBonesComputed.Set( boneIndex, true );
#endif

		// Compute local transform and put into 'output'
 		ConcatTransforms( inverted, pBones[ boneIndex ], output );

		// Cache as Euler/position
 		MatrixAngles( output, pAngles[ i ], pPositions[ i ] );
	}
	return true;
}
void CGroundLine::SetParameters(
	const Vector &vStart, 
	const Vector &vEnd, 
	const Vector &vStartColor,	// Color values 0-1
	const Vector &vEndColor,
	float alpha,
	float lineWidth
	)
{
	m_vStart = vStart;
	m_vEnd = vEnd;
	m_vStartColor = vStartColor;
	m_vEndColor = vEndColor;
	m_Alpha = alpha;
	m_LineWidth = lineWidth;

	Vector vTo( vEnd.x - vStart.x, vEnd.y - vStart.y, 0 );
	float flXYLen = vTo.Length();

	// Recalculate our segment list.
	unsigned int nSteps = (int)flXYLen / XY_PER_SEGMENT;
	nSteps = clamp( nSteps, 8, MAX_GROUNDLINE_SEGMENTS ) & ~1;
	unsigned int nMaxSteps = nSteps / 2;

	// First generate the sequence. We generate every other point here so it can insert fixup points to prevent
	// it from crossing world geometry.
	Vector pt[MAX_GROUNDLINE_SEGMENTS];
	Vector vStep = (Vector(m_vEnd[0], m_vEnd[1], 0) - Vector(m_vStart[0], m_vStart[1], 0)) / (nMaxSteps-1);

	pt[0] = FindBestSurfacePoint(m_vStart);

	unsigned int i;
	for(i=1; i < nMaxSteps; i++)
		pt[i<<1] = FindBestSurfacePoint(pt[(i-1)<<1] + vStep);


	CBitVec<MAX_GROUNDLINE_SEGMENTS> pointsUsed;
	pointsUsed.ClearAll();

	// Now try to make sure they don't intersect the geometry.
	for(i=0; i < nMaxSteps-1; i++)
	{
		Vector &a = pt[i<<1];
		Vector &b = pt[(i+1)<<1];

		trace_t trace;
		UTIL_TraceLine(a, b, MASK_SOLID_BRUSHONLY, NULL, COLLISION_GROUP_NONE, &trace);
		if(trace.fraction < 1)
		{
			int cIndex = (i<<1)+1;
			Vector &c = pt[cIndex];

			// Ok, this line segment intersects the world. Do a binary search to try to find the
			// point of intersection.
			Vector hi, lo;
			if(a.z < b.z)
			{
				hi = b;
				lo = a;
			}
			else
			{
				hi = a;
				lo = b;
			}

			if(BinSearchSegments(lo, hi, Vector(lo[0],lo[1],hi[2]), 15, &c))
			{
				pointsUsed.Set( cIndex );
			}
			else if(BinSearchSegments(lo, hi, Vector(hi[0],hi[1],hi[2]+500), 15, &c))
			{
				pointsUsed.Set( cIndex );
			}
		}
	}

	// Export the points.
	m_nPoints = 0;
	for(i=0; i < nSteps; i++)
	{
		// Every other point is always active.
		if( pointsUsed.Get( i ) || !(i & 1) )
		{
			m_Points[m_nPoints] = pt[i];
			++m_nPoints;
		}
	}
}