/*==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.

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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,
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 or by snail mail at:
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*==LICENSE==*/

#include "plAvCallbackAction.h"
#include "plAvBrainCritter.h"
#include "plAvBrainHuman.h"
#include "plArmatureMod.h"
#include "plAvBehaviors.h"
#include "plAGAnim.h"
#include "plAGAnimInstance.h"
#include "plAvatarMgr.h"

#include "plgDispatch.h"

#include "plMessage/plAIMsg.h"

#include "plPipeline/plDebugText.h"
#include "pnSceneObject/plCoordinateInterface.h"
#include "pnEncryption/plRandom.h"
#include "plNetClient/plNetClientMgr.h"
#include "plNetTransport/plNetTransportMember.h"

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

static plRandom sRandom; // random number generator

const char kDefaultIdleAnimName[] = "Idle";
const char kDefaultIdleBehName[] = "Idle";
const char kDefaultRunAnimName[] = "Run";
const char kDefaultRunBehName[] = "Run";

const float kLoudSoundMultiplyer = 2.0f;

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

class CritterBehavior : public plArmatureBehavior
{
    friend class plAvBrainCritter;

public: 
    CritterBehavior(const std::string& name, bool randomStart = false, float fadeInLength = 2.f, float fadeOutLength = 2.f) : plArmatureBehavior(),
        fAvMod(nil), fCritterBrain(nil), fName(name), fRandomStartPoint(randomStart), fFadeInLength(fadeInLength), fFadeOutLength(fadeOutLength) {}
    virtual ~CritterBehavior() {}

    void Init(plAGAnim* anim, hsBool loop, plAvBrainCritter* brain, plArmatureMod* body, uint8_t index)
    {
        plArmatureBehavior::Init(anim, loop, brain, body, index);
        fAvMod = body;
        fCritterBrain = brain;
        fAnimName = anim->GetName();
    }

    virtual hsBool PreCondition(double time, float elapsed) {return true;}

    float GetAnimLength() {return (fAnim->GetAnimation()->GetLength());}
    void SetAnimTime(float time) {fAnim->SetCurrentTime(time, true);}

    std::string Name() const {return fName;}
    plString AnimName() const {return fAnimName;}
    bool RandomStartPoint() const {return fRandomStartPoint;}
    float FadeInLength() const {return fFadeInLength;}
    float FadeOutLength() const {return fFadeOutLength;}

protected:
    virtual void IStart()
    {
        plArmatureBehavior::IStart();
        fAvMod->SynchIfLocal(hsTimer::GetSysSeconds(), false);
    }

    virtual void IStop()
    {
        plArmatureBehavior::IStop();
        fAvMod->SynchIfLocal(hsTimer::GetSysSeconds(), false);
    }       

    plArmatureMod *fAvMod;
    plAvBrainCritter *fCritterBrain;

    std::string fName; // user-created name for this behavior, also used as the index into the brain's behavior map
    plString fAnimName; // physical animation's name, for reference
    bool fRandomStartPoint; // do we want this behavior to start at a random frame every time we start it?
    float fFadeInLength; // how long to fade in this behavior
    float fFadeOutLength; // how long to fade out this behavior
};

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

plAvBrainCritter::plAvBrainCritter(): fCallbackAction(nil), fCurMode(kIdle), fNextMode(kIdle), fFadingNextBehavior(true),
    fLocallyControlled(false), fAvoidingAvatars(false), fFinalGoalPos(0, 0, 0), fImmediateGoalPos(0, 0, 0), fDotGoal(0),
    fAngRight(0)
{
    SightCone(M_PI/2); // 90deg
    StopDistance(1);
    SightDistance(10);
    HearingDistance(10);
}

plAvBrainCritter::~plAvBrainCritter()
{
    for (int i = 0; i < fBehaviors.GetCount(); ++i)
    {
        delete fBehaviors[i];
        fBehaviors[i] = nil;
    }

    delete fCallbackAction;
    fCallbackAction = nil;

    fUserBehaviors.clear();
    fReceivers.clear();
}

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

hsBool plAvBrainCritter::Apply(double time, float elapsed)
{
    // update internal pathfinding variables
    IEvalGoal();

    if (fNextMode >= kIdle)
    {
        // next mode is set, fade out the previous mode and start up the new one
        IFadeOutBehavior();
        IStartBehavior();
    }
    else
        IProcessBehavior(time, elapsed); // just continue with the currently running one

    // update our controller to keep us turned and moving to where we want to go
    fCallbackAction->RecalcVelocity(time, time - elapsed);      
    fCallbackAction->SetTurnStrength(IGetTurnStrength(time));

    return plArmatureBrain::Apply(time, elapsed);
}

hsBool plAvBrainCritter::MsgReceive(plMessage* msg)
{
    return plArmatureBrain::MsgReceive(msg);
}

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

void plAvBrainCritter::Activate(plArmatureModBase* avMod)
{
    plArmatureBrain::Activate(avMod);

    // initialize our base "Run" and "Idle" behaviors
    IInitBaseAnimations();

    // create the controller if we haven't done so already
    if (!fCallbackAction)
    {
        plSceneObject* avObj = fArmature->GetTarget(0);
        plAGModifier* agMod = const_cast<plAGModifier*>(plAGModifier::ConvertNoRef(FindModifierByClass(avObj, plAGModifier::Index())));
        plPhysicalControllerCore* controller = avMod->GetController();
        fCallbackAction = new plWalkingController(avObj, agMod->GetApplicator(kAGPinTransform), controller);
        fCallbackAction->ActivateController();
    }

    // tell people that care that we are good to go
    plAIBrainCreatedMsg* brainCreated = new plAIBrainCreatedMsg(fArmature->GetKey());
    plgDispatch::MsgSend(brainCreated);
}

void plAvBrainCritter::Deactivate()
{
    plArmatureBrain::Deactivate();
}

void plAvBrainCritter::Suspend()
{
    // fade out the previous behavior
    CritterBehavior *behavior = (CritterBehavior*)fBehaviors[fCurMode];
    behavior->SetStrength(0.f, fFadingNextBehavior ? behavior->FadeOutLength() : 0.f);

    // fade in the idle
    fNextMode = kIdle;

    plArmatureBrain::Suspend();
}

void plAvBrainCritter::Resume()
{
    // fade in the idle
    fNextMode = kIdle;

    fCallbackAction->Reset(false);

    plArmatureBrain::Resume();
}

void plAvBrainCritter::AddBehavior(const std::string& animationName, const std::string& behaviorName, bool loop /* = true */, bool randomStartPos /* = true */,
                 float fadeInLen /* = 2.f */, float fadeOutLen /* = 2.f */)
{
    // grab the animations
    plAGAnim* anim = fAvMod->FindCustomAnim(animationName.c_str());
    if (!anim)
        return; // can't find it, die

    // create the behavior and set it up
    CritterBehavior* behavior = new CritterBehavior(behaviorName, randomStartPos, fadeInLen, fadeOutLen);
    fBehaviors.Push(behavior);
    behavior->Init(anim, loop, this, fAvMod, fBehaviors.Count() - 1);
    fUserBehaviors[behaviorName].push_back(fBehaviors.Count() - 1);
}

void plAvBrainCritter::StartBehavior(const std::string& behaviorName, bool fade /* = true */)
{
    // make sure the new behavior exists
    if (fUserBehaviors.find(behaviorName) == fUserBehaviors.end())
        return;
    else
    {
        if (fUserBehaviors[behaviorName].size() == 0)
            return;
    }

    // remember the fade request
    fFadingNextBehavior = fade;

    // pick our next behavior
    fNextMode = IPickBehavior(behaviorName);
}

bool plAvBrainCritter::RunningBehavior(const std::string& behaviorName) const
{
    // make sure the behavior exists
    std::map<std::string, std::vector<int> >::const_iterator behaviorIterator = fUserBehaviors.find(behaviorName);
    if (behaviorIterator == fUserBehaviors.end())
        return false;
    else
    {
        if (behaviorIterator->second.size() == 0)
            return false;
    }

    // check all behaviors that use this tag and return true if we are running one of them
    for (unsigned i = 0; i < behaviorIterator->second.size(); ++i)
    {
        if (fCurMode == behaviorIterator->second[i])
            return true;
    }
    return false;
}

std::string plAvBrainCritter::BehaviorName(int behavior) const
{
    if ((behavior >= fBehaviors.Count()) || (behavior < 0))
        return "";
    return ((CritterBehavior*)fBehaviors[behavior])->Name();
}

plString plAvBrainCritter::AnimationName(int behavior) const
{
    if ((behavior >= fBehaviors.Count()) || (behavior < 0))
        return _TEMP_CONVERT_FROM_LITERAL("");
    return ((CritterBehavior*)fBehaviors[behavior])->AnimName();
}

std::string plAvBrainCritter::IdleBehaviorName() const
{
    return kDefaultIdleBehName;
}

std::string plAvBrainCritter::RunBehaviorName() const
{
    return kDefaultRunBehName;
}

void plAvBrainCritter::GoToGoal(hsPoint3 newGoal, bool avoidingAvatars /* = false */)
{
    fFinalGoalPos = newGoal;
    fAvoidingAvatars = avoidingAvatars;
    fNextMode = IPickBehavior(kRun);
    // TODO: Pathfinding here!
}

bool plAvBrainCritter::AtGoal() const
{
    // we are at our goal if our distance from it is less then or equal to our stopping distance
    hsPoint3 creaturePos;
    hsQuat creatureRot;
    fAvMod->GetPositionAndRotationSim(&creaturePos, &creatureRot);
    hsVector3 finalGoalVec(creaturePos - fFinalGoalPos);
    return (finalGoalVec.MagnitudeSquared() <= fStopDistanceSquared);
}

void plAvBrainCritter::SightCone(float coneRad)
{
    fSightConeAngle = coneRad;

    // calculate the minimum dot product for the cone of sight (angle/2 vector dotted with straight ahead)
    hsVector3 straightVector(1, 0, 0), viewVector(1, 0, 0), up(0, 1, 0);
    hsQuat rotation(fSightConeAngle/2, &up);
    viewVector = hsVector3(rotation.Rotate(&viewVector));
    viewVector.Normalize();
    fSightConeDotMin = straightVector * viewVector;
}

void plAvBrainCritter::HearingDistance(float hearDis)
{
    fHearingDistance = hearDis;
    fHearingDistanceSquared = fHearingDistance * fHearingDistance;
    fLoudHearingDistanceSquared = (fHearingDistance * kLoudSoundMultiplyer) * (fHearingDistance * kLoudSoundMultiplyer);
}

bool plAvBrainCritter::CanSeeAvatar(unsigned long id) const
{
    plArmatureMod* avatar = plAvatarMgr::GetInstance()->FindAvatarByPlayerID(id);
    if (avatar)
        return ICanSeeAvatar(avatar);
    return false;
}

bool plAvBrainCritter::CanHearAvatar(unsigned long id) const
{
    plArmatureMod* avatar = plAvatarMgr::GetInstance()->FindAvatarByPlayerID(id);
    if (avatar)
        return ICanHearAvatar(avatar);
    return false;
}

std::vector<unsigned long> plAvBrainCritter::PlayersICanSee() const
{
    std::vector<unsigned long> allPlayers = IGetAgePlayerIDList();
    std::vector<unsigned long> onesICanSee;
    for (unsigned i = 0; i < allPlayers.size(); ++i)
    {
        if (CanSeeAvatar(allPlayers[i]))
            onesICanSee.push_back(allPlayers[i]);
    }
    return onesICanSee;
}

std::vector<unsigned long> plAvBrainCritter::PlayersICanHear() const
{
    std::vector<unsigned long> allPlayers = IGetAgePlayerIDList();
    std::vector<unsigned long> onesICanHear;
    for (unsigned i = 0; i < allPlayers.size(); ++i)
    {
        if (CanHearAvatar(allPlayers[i]))
            onesICanHear.push_back(allPlayers[i]);
    }
    return onesICanHear;
}

hsVector3 plAvBrainCritter::VectorToPlayer(unsigned long id) const
{
    plArmatureMod* avatar = plAvatarMgr::GetInstance()->FindAvatarByPlayerID(id);
    if (!avatar)
        return hsVector3(0, 0, 0);

    hsPoint3 avPos;
    hsQuat avRot;
    avatar->GetPositionAndRotationSim(&avPos, &avRot);

    hsPoint3 creaturePos;
    hsQuat creatureRot;
    fAvMod->GetPositionAndRotationSim(&creaturePos, &creatureRot);

    return hsVector3(creaturePos - avPos);
}

void plAvBrainCritter::AddReceiver(const plKey key)
{
    for (unsigned i = 0; i < fReceivers.size(); ++i)
    {
        if (fReceivers[i] == key)
            return; // already in our list
    }
    fReceivers.push_back(key);
}

void plAvBrainCritter::RemoveReceiver(const plKey key)
{
    for (unsigned i = 0; i < fReceivers.size(); ++i)
    {
        if (fReceivers[i] == key)
        {
            fReceivers.erase(fReceivers.begin() + i);
            return;
        }
    }
    return; // not found, do nothing
}

void plAvBrainCritter::DumpToDebugDisplay(int& x, int& y, int lineHeight, char* strBuf, plDebugText& debugTxt)
{
    sprintf(strBuf, "Brain type: Critter");
    debugTxt.DrawString(x, y, strBuf, 0, 255, 255);
    y += lineHeight;

    // extract the name from the behavior running
    if (fBehaviors[fCurMode])
        sprintf(strBuf, "Mode: %s", ((CritterBehavior*)(fBehaviors[fCurMode]))->Name().c_str());
    else
        sprintf(strBuf, "Mode: Unknown");
    
    // draw it
    debugTxt.DrawString(x, y, strBuf);
    y += lineHeight;
    for (int i = 0; i < fBehaviors.GetCount(); ++i)
        fBehaviors[i]->DumpDebug(x, y, lineHeight, strBuf, debugTxt);
}

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

hsBool plAvBrainCritter::IInitBaseAnimations()
{
    // create the basic idle and run behaviors, and put them into our appropriate structures
    plAGAnim* idle = fAvMod->FindCustomAnim(kDefaultIdleAnimName);
    plAGAnim* run = fAvMod->FindCustomAnim(kDefaultRunAnimName);

    hsAssert(idle, "Creature is missing idle animation");
    hsAssert(run, "Creature is missing run animation");

    fBehaviors.SetCountAndZero(kNumDefaultModes);

    CritterBehavior* behavior;
    if (idle)
    {
        fBehaviors[kIdle] = behavior = new CritterBehavior(kDefaultIdleBehName, true); // starts at a random start point each time
        behavior->Init(idle, true, this, fAvMod, kIdle);
        fUserBehaviors[kDefaultIdleBehName].push_back(kIdle);
    }

    if (run)
    {
        fBehaviors[kRun] = behavior = new CritterBehavior(kDefaultRunBehName);
        behavior->Init(run, true, this, fAvMod, kRun);
        fUserBehaviors[kDefaultRunBehName].push_back(kRun);
    }

    return true;
}

int plAvBrainCritter::IPickBehavior(int behavior) const
{
    if ((behavior >= fBehaviors.Count()) || (behavior < 0))
        return IPickBehavior(kDefaultIdleBehName); // do an idle if the behavior is invalid

    CritterBehavior* behaviorObj = (CritterBehavior*)(fBehaviors[behavior]);
    return IPickBehavior(behaviorObj->Name());
}

int plAvBrainCritter::IPickBehavior(const std::string& behavior) const
{
    // make sure the behavior exists
    std::map<std::string, std::vector<int> >::const_iterator behaviorIterator = fUserBehaviors.find(behavior);
    if (behaviorIterator == fUserBehaviors.end())
    {
        if (behavior != kDefaultIdleBehName)
            return IPickBehavior(kDefaultIdleBehName); // do an idle if the behavior is invalid
        return -1; // can't recover from being unable to find an idle!
    }
    else
    {
        unsigned numBehaviors = behaviorIterator->second.size();
        if (numBehaviors == 0)
        {
            if (behavior != kDefaultIdleBehName)
                return IPickBehavior(kDefaultIdleBehName); // do an idle if the behavior is invalid
            return -1; // can't recover from being unable to find an idle!
        }

        // pick our behavior
        unsigned index = sRandom.RandRangeI(0, numBehaviors - 1);
        return behaviorIterator->second[index];
    }
}

void plAvBrainCritter::IFadeOutBehavior()
{
    if ((fCurMode >= fBehaviors.Count()) || (fCurMode < 0))
        return; // invalid fCurMode

    // fade out currently playing behavior
    CritterBehavior* behavior = (CritterBehavior*)fBehaviors[fCurMode];
    behavior->SetStrength(0.f, fFadingNextBehavior ? behavior->FadeOutLength() : 0.f);
}

void plAvBrainCritter::IStartBehavior()
{
    if ((fNextMode >= fBehaviors.Count()) || (fNextMode < 0))
        return; // invalid fNextMode

    // fade in our behavior
    CritterBehavior* behavior = (CritterBehavior*)fBehaviors[fNextMode];
    behavior->SetStrength(1.f, fFadingNextBehavior ? behavior->FadeInLength() : 0.f);

    // if we start at a random point, do so
    if (behavior->RandomStartPoint())
    {
        float newStart = sRandom.RandZeroToOne() * behavior->GetAnimLength();
        behavior->SetAnimTime(newStart);
    }

    // clean up the internal variables
    fCurMode = fNextMode;
    fNextMode = -1;
}

void plAvBrainCritter::IProcessBehavior(double time, float elapsed)
{
    // run the currently running behavior
    CritterBehavior* behavior = (CritterBehavior*)fBehaviors[fCurMode];
    behavior->SetStrength(1.f, fFadingNextBehavior ? behavior->FadeInLength() : 0.f);
    behavior->Process(time, elapsed);
}

void plAvBrainCritter::IEvalGoal()
{
    // TODO: Implement pathfinding logic here
    // (for now, this runs directly towards the goal)
    fImmediateGoalPos = fFinalGoalPos;

    // where am I relative to my goal?
    const plSceneObject* creatureObj = fArmature->GetTarget(0);
    hsVector3 view(creatureObj->GetCoordinateInterface()->GetLocalToWorld().GetAxis(hsMatrix44::kView));

    hsPoint3 creaturePos;
    hsQuat creatureRot;
    fAvMod->GetPositionAndRotationSim(&creaturePos, &creatureRot);
    hsVector3 goalVec(creaturePos - fImmediateGoalPos);
    goalVec.Normalize();
    fDotGoal = goalVec * view; // 1 = directly facing, 0 = 90 deg off, -1 = facing away

    // calculate a vector pointing to the creature's right
    hsQuat invRot = creatureRot.Conjugate();
    hsPoint3 globRight = invRot.Rotate(&kAvatarRight);
    fAngRight = globRight.InnerProduct(goalVec); // dot product, 1 = goal is 90 to the right, 0 = goal is in front or behind, -1 = goal is 90 to the left

    if (fAvoidingAvatars)
    {
        // check to see we can see anyone in our way (if we can't see them, we can't avoid them)
        std::vector<plArmatureMod*> playersICanSee = IAvatarsICanSee();
        for (unsigned i = 0; i < playersICanSee.size(); ++i)
        {
            hsPoint3 avPos;
            hsQuat avRot;
            playersICanSee[i]->GetPositionAndRotationSim(&avPos, &avRot);
            hsVector3 avVec(creaturePos - avPos);
            avVec.Normalize();

            float dotAv = avVec * goalVec;
            if (dotAv > 0.5f) // within a 45deg angle in front of us
            {
                // a player is in the way, so we will change our "goal" to a 90deg angle from the player
                // then we stop searching, since any other players in the way will just produce the same (or similar) result
                avVec.fZ = goalVec.fZ = 0.f;
                goalVec = goalVec % avVec;
                fAngRight = globRight.InnerProduct(goalVec);
                break;
            }
        }
    }

    // are we at our final goal?
    if (AtGoal())
    {
        if (RunningBehavior(kDefaultRunBehName)) // don't do anything if we're not running!
        {
            // we're close enough, stop running and pick an idle
            fNextMode = IPickBehavior(kIdle);

            // tell everyone who cares that we have arrived
            for (unsigned i = 0; i < fReceivers.size(); ++i)
            {
                plAIArrivedAtGoalMsg* msg = new plAIArrivedAtGoalMsg(fArmature->GetKey(), fReceivers[i]);
                msg->Goal(fFinalGoalPos);
                msg->Send();
            }
        }
    }
}

float plAvBrainCritter::IGetTurnStrength(double time) const
{
    if (!RunningBehavior(kDefaultRunBehName))
        return 0.0f;

    // am I directly facing my goal?
    if (fDotGoal < -0.98)
        return 0.f;

    if (fAngRight > 0.f)
        return 1.f;
    return -1.f;
}

std::vector<unsigned long> plAvBrainCritter::IGetAgePlayerIDList() const
{
    // make a list of non-local players
    std::vector<unsigned long> playerIDs;
    std::map<unsigned long, bool> tempMap; // slightly hacky way to remove dups
    plNetClientMgr* nc = plNetClientMgr::GetInstance();
    for (int i = 0; i < nc->TransportMgr().GetNumMembers(); ++i)
    {
        plNetTransportMember* mbr = nc->TransportMgr().GetMember(i);
        unsigned long id = mbr->GetPlayerID();
        if (tempMap.find(id) == tempMap.end())
        {
            playerIDs.push_back(id);
            tempMap[id] = true;
        }
    }
    // add the local player if he isn't already in the list
    unsigned long localID = nc->GetPlayerID();
    if (tempMap.find(localID) == tempMap.end())
        playerIDs.push_back(localID);

    // return result
    return playerIDs;
}

bool plAvBrainCritter::ICanSeeAvatar(plArmatureMod* avatar) const
{
    // sight is a x deg cone in front of the critter, cuts off at a certain distance
    hsPoint3 avPos;
    hsQuat avRot;
    avatar->GetPositionAndRotationSim(&avPos, &avRot);

    hsPoint3 creaturePos;
    hsQuat creatureRot;
    fAvMod->GetPositionAndRotationSim(&creaturePos, &creatureRot);

    hsVector3 avVec(creaturePos - avPos);
    if (avVec.MagnitudeSquared() > fSightDistanceSquared)
        return false; // too far away
    avVec.Normalize();
    
    const plSceneObject* creatureObj = fArmature->GetTarget(0);
    hsVector3 view(creatureObj->GetCoordinateInterface()->GetLocalToWorld().GetAxis(hsMatrix44::kView));
    float avDot = view * avVec;
    if (avDot < fSightConeDotMin)
        return false; // out of our cone of view
    return true;
}

bool plAvBrainCritter::ICanHearAvatar(plArmatureMod* avatar) const
{
    // check to see if the avatar is being loud (running or jumping)
    bool isLoud = false;
    plAvBrainHuman* humanBrain = plAvBrainHuman::ConvertNoRef(avatar->FindBrainByClass(plAvBrainHuman::Index()));
    if (humanBrain)
    {
        isLoud = humanBrain->IsBehaviorPlaying(plAvBrainHuman::kRun) || humanBrain->IsBehaviorPlaying(plAvBrainHuman::kStandingJump) ||
            humanBrain->IsBehaviorPlaying(plAvBrainHuman::kWalkingJump) || humanBrain->IsBehaviorPlaying(plAvBrainHuman::kRunningJump) ||
            humanBrain->IsBehaviorPlaying(plAvBrainHuman::kGroundImpact) || humanBrain->IsBehaviorPlaying(plAvBrainHuman::kRunningImpact);
    }

    // hearing is 360 degrees around the critter, cuts off at a certain distance
    hsPoint3 avPos;
    hsQuat avRot;
    avatar->GetPositionAndRotationSim(&avPos, &avRot);

    hsPoint3 creaturePos;
    hsQuat creatureRot;
    fAvMod->GetPositionAndRotationSim(&creaturePos, &creatureRot);

    hsVector3 avVec(creaturePos - avPos);
    float distSq = avVec.MagnitudeSquared();
    if (distSq <= fHearingDistanceSquared)
        return true; // within our normal hearing distance
    else if (isLoud && (distSq <= fLoudHearingDistanceSquared))
        return true; // they are being loud, and within our loud hearing distance
    return false;
}

std::vector<plArmatureMod*> plAvBrainCritter::IAvatarsICanSee() const
{
    std::vector<unsigned long> allPlayers = IGetAgePlayerIDList();
    std::vector<plArmatureMod*> onesICanSee;
    for (unsigned i = 0; i < allPlayers.size(); ++i)
    {
        plArmatureMod* avatar = plAvatarMgr::GetInstance()->FindAvatarByPlayerID(allPlayers[i]);
        if (!avatar)
            continue;

        if (ICanSeeAvatar(avatar))
            onesICanSee.push_back(avatar);
    }
    return onesICanSee;
}

std::vector<plArmatureMod*> plAvBrainCritter::IAvatarsICanHear() const
{
    std::vector<unsigned long> allPlayers = IGetAgePlayerIDList();
    std::vector<plArmatureMod*> onesICanHear;
    for (unsigned i = 0; i < allPlayers.size(); ++i)
    {
        plArmatureMod* avatar = plAvatarMgr::GetInstance()->FindAvatarByPlayerID(allPlayers[i]);
        if (!avatar)
            continue;

        if (ICanHearAvatar(avatar))
            onesICanHear.push_back(avatar);
    }
    return onesICanHear;
}
