TotemAI.cpp

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/*
 * This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
 *
 * 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 2 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/>.
 */
 
#include "TotemAI.h"
#include "CellImpl.h"
#include "Creature.h"
#include "GridNotifiers.h"
#include "GridNotifiersImpl.h"
#include "ObjectAccessor.h"
#include "SpellInfo.h"
#include "SpellMgr.h"
#include "Totem.h"
 
int32 TotemAI::Permissible(Creature const* creature)
{
 if (creature->IsTotem())
 return PERMIT_BASE_PROACTIVE;
 
 return PERMIT_BASE_NO;
}
 
TotemAI::TotemAI(Creature* creature, uint32 scriptId) : NullCreatureAI(creature, scriptId), _victimGUID()
{
 ASSERT(creature->IsTotem(), "TotemAI: AI assigned to a non-totem creature (%s)!", creature->GetGUID().ToString().c_str());
}
 
void TotemAI::UpdateAI(uint32 /*diff*/)
{
 if (me->ToTotem()->GetTotemType() != TOTEM_ACTIVE)
 return;
 
 if (!me->IsAlive() || me->IsNonMeleeSpellCast(false))
 return;
 
 // Search spell
 SpellInfo const* spellInfo = sSpellMgr->GetSpellInfo(me->ToTotem()->GetSpell(), me->GetMap()->GetDifficultyID());
 if (!spellInfo)
 return;
 
 // Get spell range
 float max_range = spellInfo->GetMaxRange(false);
 
 // SpellModOp::Range not applied in this place just because not existence range mods for attacking totems
 
 // pointer to appropriate target if found any
 Unit* victim = !_victimGUID.IsEmpty() ? ObjectAccessor::GetUnit(*me, _victimGUID) : nullptr;
 
 // Search victim if no, not attackable, or out of range, or friendly (possible in case duel end)
 if (!victim || !victim->isTargetableForAttack() || !me->IsWithinDistInMap(victim, max_range) || me->IsFriendlyTo(victim) || !me->CanSeeOrDetect(victim))
 {
 victim = nullptr;
 float extraSearchRadius = max_range > 0.0f ? EXTRA_CELL_SEARCH_RADIUS : 0.0f;
 Trinity::NearestAttackableUnitInObjectRangeCheck u_check(me, me->GetCharmerOrOwnerOrSelf(), max_range);
 Trinity::UnitLastSearcher<Trinity::NearestAttackableUnitInObjectRangeCheck> checker(me, victim, u_check);
 Cell::VisitAllObjects(me, checker, max_range + extraSearchRadius);
 }
 
 // If have target
 if (victim)
 {
 // remember
 _victimGUID = victim->GetGUID();
 
 // attack
 me->CastSpell(victim, me->ToTotem()->GetSpell());
 }
 else
 _victimGUID.Clear();
}
 
void TotemAI::AttackStart(Unit* /*victim*/)
{
}