// Purpose: re-select target
void OnInitialize    (IQ_Brain* brain)
{
   msg("sizeof(Brain)=%d", sizeof(IQ_Brain));
   brain->EyeMode   = EYE_LookAround;
   brain->EyeHeight  = 1;
   brain->EyeFOV   = 120;
   brain->EyeRange   = 100;
   brain->EyeLookSpeed  = 4;
   iqVisible_set_clsid  (&(brain->Visible[TCLASS_Primary]),"O_ACTOR");
   brain->Target   = NULL;
   brain->NaviMode   = NAVI_Stay;
   brain->NaviPrediction  = 0.1;
   brain->NaviSpeed  = NS_RUN;
   brain->AuralPerception  = 0.5;
};

void timersCancel(IQ_Brain* brain)
{
   brain->Timers[TM_StayAnimation].cProcedure    = 0;
   brain->Timers[TM_TargetLost].cProcedure  = 0;
}

// Purpose: re-select target
// Note:    'Target' may be automatically cleared if it becomes invisible
//   TargetPoint specifies last 'seen' position
void naviPrimary(IQ_Brain* brain)
{
//    msg("naviPrimary");
   brain->Target    = brain->Visible[TCLASS_Primary].nearestReachable;
   brain->NaviMode    = NAVI_TargetObject;
   brain->EyeMode    = EYE_LookTarget;
   brain->NaviSpeed= NS_RUN;
   timersCancel(brain);
}
void naviOptional(IQ_Brain* brain)
{
//    msg("naviOptional");
   brain->Target    = brain->Visible[TCLASS_Optional].nearestReachable;
   brain->NaviMode    = NAVI_TargetObject;
   brain->EyeMode    = EYE_LookAround;
   brain->NaviSpeed= NS_WALK;
   timersCancel(brain);
}
void naviStay    (IQ_Brain* brain)
{
//    msg("naviStay");
   brain->Target    = NULL;
   brain->NaviMode    = NAVI_Stay;
   brain->EyeMode    = EYE_LookAround;
   brain->NaviSpeed= 0;
   timersCancel(brain);
}

void OnVisGain  (IQ_Brain* brain, int group)
{
//    msg("OnVisGain");
   if (brain->Target) {
    switch (group) {
    case TCLASS_Primary:  // enemy
     // re-select target
     naviPrimary(brain);
     break;
    case TCLASS_Secondary:  // dangerous thing
     // do nothing
     break;
    case TCLASS_Optional:  // item
     // re-select target
     if (brain->TargetGroup != TCLASS_Primary) {
      // we was moving to item or something else
      // reselect target if better exists
      naviOptional(brain);
     }
     break;
    }