//Doomfire Targeting
class DoomfireTargetingAI : MoonScriptCreatureAI
{
    MOONSCRIPT_FACTORY_FUNCTION(DoomfireTargetingAI, MoonScriptCreatureAI);
    DoomfireTargetingAI(Creature* pCreature) : MoonScriptCreatureAI(pCreature)
    {
        _unit->SetUInt64Value(UNIT_FIELD_FLAGS, UNIT_FLAG_NOT_SELECTABLE);
        _unit->GetAIInterface()->SetAllowedToEnterCombat(false);
        _unit->m_noRespawn = true;

        RegisterAIUpdateEvent(1000);

        DespawnTimer = 0;
        DirChange = 0;
        lastx = _unit->GetPositionX();
        lasty = _unit->GetPositionY();
        _unit->GetAIInterface()->getUnitToFollow();
        _unit->CastSpell(_unit, DOOMFIRE_VISUAL, true);
    }

    void AIUpdate()
    {
        _unit->CastSpell(_unit, DOOMFIRE_VISUAL, true);
        DespawnTimer++;
        if(DespawnTimer >= 28)
        {
            _unit->SafeDelete();
            return;
        }
        //Check se si è spostato almeno di 4, altrimenti rispawna un doomfire sopra l'altro
        if(fabs(_unit->GetPositionX()-lastx)>3 || fabs(_unit->GetPositionY()-lasty)>3)
        {
            SpawnCreature(CN_DOOMFIRE);
            lastx = _unit->GetPositionX();
            lasty = _unit->GetPositionY();
        }

        // After 4 sec of last direction change, doomfire has 33% chance to change direction
        DirChange++;
        if ((DirChange == 4 && RandomUInt(3) == 1) || DirChange >= 6)
        {
            if (_unit->GetAIInterface()->getUnitToFollow())
            {
                if (RandomUInt(3) == 1 || _unit->GetDistance2dSq(_unit->GetAIInterface()->getUnitToFollow()) <= 2.0f)
                {
                    _unit->GetAIInterface()->SetUnitToFollow(NULL);
                    _unit->GetAIInterface()->SetUnitToFollowAngle(0.0f);
                }
            }

            if (!_unit->GetAIInterface()->getUnitToFollow())
            {
                if (RandomUInt(3) == 1)
                {
                    Unit *NewTarget = NULL;
                    NewTarget = GetBestPlayerTarget(TargetFilter_None,0,15);
                    if(NewTarget)
                    {
                        _unit->GetAIInterface()->SetUnitToFollow(NewTarget);
                        _unit->GetAIInterface()->SetUnitToFollowAngle(2.0f);
                    }
                }

                if (!_unit->GetAIInterface()->getUnitToFollow())
                {
                    float movedist = 10.0f;
                    float x = 0.0f;
                    float y = 0.0f;

                    float xchange = (float)RandomFloat(movedist);
                    float ychange = sqrt(movedist*movedist - xchange*xchange);

                    if (RandomUInt(2) == 1)
                        xchange *= -1;
                    if (RandomUInt(2) == 1)
                        ychange *= -1;

                    x = _unit->GetPositionX() + xchange;
                    y = _unit->GetPositionY() + ychange;

                    float z = _unit->GetMapMgr()->GetLandHeight(x, y); //_unit->GetPositionZ()
                    _unit->GetAIInterface()->MoveTo(x, y, z, _unit->GetOrientation());
                }
            }

            DirChange = 0;
        }
    }

protected:
    uint32 DespawnTimer;
    uint32 DirChange;
    float lastx;
    float lasty;
};