EverWrath/src/server/scripts/Northrend/Naxxramas/boss_gothik.cpp

/*
 * This file is part of the AzerothCore 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 "CombatAI.h"
#include "CreatureScript.h"
#include "GridNotifiers.h"
#include "ScriptedCreature.h"
#include "SpellScript.h"
#include "SpellScriptLoader.h"
#include "naxxramas.h"

enum Yells
{
    SAY_INTRO_1                     = 0,
    SAY_INTRO_2                     = 1,
    SAY_INTRO_3                     = 2,
    SAY_INTRO_4                     = 3,
    SAY_PHASE_TWO                   = 4,
    SAY_DEATH                       = 5,
    SAY_KILL                        = 6,

    EMOTE_PHASE_TWO                 = 7,
    EMOTE_GATE_OPENED               = 8
};

enum Spells
{
    // Gothik
    SPELL_HARVEST_SOUL              = 28679,
    SPELL_SHADOW_BOLT               = 29317,
    // Teleport spells
    SPELL_TELEPORT_DEAD             = 28025,
    SPELL_TELEPORT_LIVE             = 28026,
    //  Visual spells
    SPELL_ANCHOR_1_TRAINEE          = 27892,
    SPELL_ANCHOR_1_DK               = 27928,
    SPELL_ANCHOR_1_RIDER            = 27935,
    SPELL_ANCHOR_2_TRAINEE          = 27893,
    SPELL_ANCHOR_2_DK               = 27929,
    SPELL_ANCHOR_2_RIDER            = 27936,
    SPELL_SKULLS_TRAINEE            = 27915,
    SPELL_SKULLS_DK                 = 27931,
    SPELL_SKULLS_RIDER              = 27937,
    // Living trainee
    SPELL_DEATH_PLAGUE              = 55604,
    // Dead trainee
    SPELL_ARCANE_EXPLOSION          = 27989,
    // Living knight
    SPELL_SHADOW_MARK               = 27825,
    // Dead knight
    SPELL_WHIRLWIND                 = 56408,
    // Living rider
    SPELL_SHADOW_BOLT_VOLLEY        = 27831,
    // Dead rider
    SPELL_DRAIN_LIFE                = 27994,
    SPELL_UNHOLY_FRENZY             = 55648,
    // Horse
    SPELL_STOMP                     = 27993
};

enum Misc
{
    NPC_LIVING_TRAINEE              = 16124,
    NPC_LIVING_KNIGHT               = 16125,
    NPC_LIVING_RIDER                = 16126,
    NPC_DEAD_TRAINEE                = 16127,
    NPC_DEAD_KNIGHT                 = 16148,
    NPC_DEAD_HORSE                  = 16149,
    NPC_DEAD_RIDER                  = 16150,
    NPC_TRIGGER                     = 16137
};

enum Events
{
    // Gothik
    EVENT_SUMMON_ADDS               = 1,
    EVENT_HARVEST_SOUL              = 2,
    EVENT_SHADOW_BOLT               = 3,
    EVENT_TELEPORT                  = 4,
    EVENT_CHECK_HEALTH              = 5,
    EVENT_CHECK_PLAYERS             = 6,
    // Living trainee
    EVENT_DEATH_PLAGUE              = 7,
    // Dead trainee
    EVENT_ARCANE_EXPLOSION          = 8,
    // Living knight
    EVENT_SHADOW_MARK               = 9,
    // Dead knight
    EVENT_WHIRLWIND                 = 10,
    // Living rider
    EVENT_SHADOW_BOLT_VOLLEY        = 11,
    // Dead rider
    EVENT_DRAIN_LIFE                = 12,
    EVENT_UNHOLY_FRENZY             = 13,
    // HORSE
    EVENT_STOMP                     = 14,
    // Intro
    EVENT_INTRO_2                   = 15,
    EVENT_INTRO_3                   = 16,
    EVENT_INTRO_4                   = 17,
    // Resume after teleport
    EVENT_RESUME_ATTACK             = 18
};

const uint32 gothikWaves[24][2] =
{
    {NPC_LIVING_TRAINEE,    20000},
    {NPC_LIVING_TRAINEE,    20000},
    {NPC_LIVING_TRAINEE,    10000},
    {NPC_LIVING_KNIGHT,     10000},
    {NPC_LIVING_TRAINEE,    15000},
    {NPC_LIVING_KNIGHT,     10000},
    {NPC_LIVING_TRAINEE,    15000},
    {NPC_LIVING_TRAINEE,    0},
    {NPC_LIVING_KNIGHT,     10000},
    {NPC_LIVING_RIDER,      10000},
    {NPC_LIVING_TRAINEE,    5000},
    {NPC_LIVING_KNIGHT,     15000},
    {NPC_LIVING_RIDER,      0},
    {NPC_LIVING_TRAINEE,    10000},
    {NPC_LIVING_KNIGHT,     10000},
    {NPC_LIVING_TRAINEE,    10000},
    {NPC_LIVING_RIDER,      5000},
    {NPC_LIVING_KNIGHT,     5000},
    {NPC_LIVING_TRAINEE,    20000},
    {NPC_LIVING_RIDER,      0},
    {NPC_LIVING_KNIGHT,     0},
    {NPC_LIVING_TRAINEE,    15000},
    {NPC_LIVING_TRAINEE,    29000},
    {0, 0}
};

const Position PosSummonLiving[6] =
{
    {2669.7f, -3428.76f, 268.56f, 1.6f},
    {2692.1f, -3428.76f, 268.56f, 1.6f},
    {2714.4f, -3428.76f, 268.56f, 1.6f},
    {2669.7f, -3431.67f, 268.56f, 1.6f},
    {2692.1f, -3431.67f, 268.56f, 1.6f},
    {2714.4f, -3431.67f, 268.56f, 1.6f}
};

const Position PosSummonDead[5] =
{
    {2725.1f, -3310.0f, 268.85f, 3.4f},
    {2699.3f, -3322.8f, 268.60f, 3.3f},
    {2733.1f, -3348.5f, 268.84f, 3.1f},
    {2682.8f, -3304.2f, 268.85f, 3.9f},
    {2664.8f, -3340.7f, 268.23f, 3.7f}
};

//const Position PosGroundLivingSide = {2691.2f, -3387.0f, 267.68f, 1.52f};
//const Position PosGroundDeadSide   = {2693.5f, -3334.6f, 267.68f, 4.67f};
//const Position PosPlatform         = {2640.5f, -3360.6f, 285.26f, 0.0f};

#define POS_Y_GATE  -3360.78f
#define POS_Y_WEST  -3285.0f
#define POS_Y_EAST  -3434.0f
#define POS_X_NORTH  2750.49f
#define POS_X_SOUTH  2633.84f
#define IN_LIVE_SIDE(who) (who->GetPositionY() < POS_Y_GATE)

class boss_gothik : public CreatureScript
{
public:
    boss_gothik() : CreatureScript("boss_gothik") { }

    CreatureAI* GetAI(Creature* pCreature) const override
    {
        return GetNaxxramasAI<boss_gothikAI>(pCreature);
    }

    struct boss_gothikAI : public BossAI
    {
        explicit boss_gothikAI(Creature* c) : BossAI(c, BOSS_GOTHIK), summons(me)
        {}

        EventMap events;
        SummonList summons;
        bool secondPhase{};
        bool gateOpened{};
        bool lastTeleportDead{};
        uint8 waveCount{};

        bool IsInRoom()
        {
            if (me->GetPositionX() > 2767 || me->GetPositionX() < 2618 || me->GetPositionY() > -3285 || me->GetPositionY() < -3435)
            {
                EnterEvadeMode();
                return false;
            }
            return true;
        }

        void Reset() override
        {
            BossAI::Reset();
            events.Reset();
            summons.DespawnAll();
            me->RemoveUnitFlag(UNIT_FLAG_DISABLE_MOVE);
            me->SetImmuneToPC(false);
            me->SetReactState(REACT_PASSIVE);
            secondPhase = false;
            gateOpened = false;
            lastTeleportDead = false;
            waveCount = 0;
            me->NearTeleportTo(2642.139f, -3386.959f, 285.492f, 6.265f);
        }

        void JustEngagedWith(Unit* who) override
        {
            BossAI::JustEngagedWith(who);
            me->SetInCombatWithZone();
            Talk(SAY_INTRO_1);
            events.ScheduleEvent(EVENT_INTRO_2, 4s);
            events.ScheduleEvent(EVENT_INTRO_3, 9s);
            events.ScheduleEvent(EVENT_INTRO_4, 14s);
            me->SetUnitFlag(UNIT_FLAG_DISABLE_MOVE);
            events.ScheduleEvent(EVENT_SUMMON_ADDS, 30s);
            events.ScheduleEvent(EVENT_CHECK_PLAYERS, 2min);
        }

        void JustSummoned(Creature* summon) override
        {
            summons.Summon(summon);
            // If central gate is open, attack any one
            if (gateOpened)
            {
                if (Unit* target = SelectTarget(SelectTargetMethod::MinDistance, 0, 200.0f))
                {
                    summon->AI()->AttackStart(target);
                    summon->SetInCombatWithZone();
                    summon->SetReactState(REACT_AGGRESSIVE);
                    summon->CallForHelp(150.0f);
                }
            }
            // Else look for a random target on the side the summoned NPC is
            else
            {
                Map::PlayerList const& pList = me->GetMap()->GetPlayers();
                std::vector<Player*> tList;
                for(Map::PlayerList::const_iterator itr = pList.begin(); itr != pList.end(); ++itr)
                {
                    if (!me->IsWithinDistInMap(itr->GetSource(), 200.0f, true, false, false) || !itr->GetSource()->IsAlive() || itr->GetSource()->IsGameMaster())
                    {
                        continue;
                    }
                    if (IN_LIVE_SIDE(itr->GetSource()) != IN_LIVE_SIDE(summon))
                    {
                        continue;
                    }
                    tList.push_back(itr->GetSource());
                }
                if (!tList.empty())
                {
                    Player* target = tList[urand(0, tList.size() - 1)];
                    summon->AI()->AttackStart(target);
                    summon->SetInCombatWithZone();
                    summon->SetReactState(REACT_AGGRESSIVE);
                }
            }
        }

        void SummonedCreatureDespawn(Creature* cr) override
        {
            summons.Despawn(cr);
        }

        void KilledUnit(Unit* who) override
        {
            if (!who->IsPlayer())
                return;

            Talk(SAY_KILL);
            instance->StorePersistentData(PERSISTENT_DATA_IMMORTAL_FAIL, 1);
        }

        void JustDied(Unit*  killer) override
        {
            BossAI::JustDied(killer);
            Talk(SAY_DEATH);
            summons.DespawnAll();
        }

        void SummonHelpers(uint32 entry)
        {
            switch (entry)
            {
                case NPC_LIVING_TRAINEE:
                    me->SummonCreature(NPC_LIVING_TRAINEE, PosSummonLiving[0].GetPositionX(), PosSummonLiving[0].GetPositionY(), PosSummonLiving[0].GetPositionZ(), PosSummonLiving[0].GetOrientation());
                    me->SummonCreature(NPC_LIVING_TRAINEE, PosSummonLiving[1].GetPositionX(), PosSummonLiving[1].GetPositionY(), PosSummonLiving[1].GetPositionZ(), PosSummonLiving[1].GetOrientation());
                    if (Is25ManRaid())
                    {
                        me->SummonCreature(NPC_LIVING_TRAINEE, PosSummonLiving[2].GetPositionX(), PosSummonLiving[2].GetPositionY(), PosSummonLiving[2].GetPositionZ(), PosSummonLiving[2].GetOrientation());
                    }
                    break;
                case NPC_LIVING_KNIGHT:
                    me->SummonCreature(NPC_LIVING_KNIGHT, PosSummonLiving[3].GetPositionX(), PosSummonLiving[3].GetPositionY(), PosSummonLiving[3].GetPositionZ(), PosSummonLiving[3].GetOrientation());
                    if (Is25ManRaid())
                    {
                        me->SummonCreature(NPC_LIVING_KNIGHT, PosSummonLiving[5].GetPositionX(), PosSummonLiving[5].GetPositionY(), PosSummonLiving[5].GetPositionZ(), PosSummonLiving[5].GetOrientation());
                    }
                    break;
                case NPC_LIVING_RIDER:
                    me->SummonCreature(NPC_LIVING_RIDER, PosSummonLiving[4].GetPositionX(), PosSummonLiving[4].GetPositionY(), PosSummonLiving[4].GetPositionZ(), PosSummonLiving[4].GetOrientation());
                    break;
            }
        }

        bool CheckGroupSplitted()
        {
            Map::PlayerList const& PlayerList = me->GetMap()->GetPlayers();
            if (!PlayerList.IsEmpty())
            {
                bool checklife = false;
                bool checkdead = false;
                for (auto const& i : PlayerList)
                {
                    Player* player = i.GetSource();
                    if (player->IsAlive() &&
                        player->GetPositionX() <= POS_X_NORTH &&
                        player->GetPositionX() >= POS_X_SOUTH &&
                        player->GetPositionY() <= POS_Y_GATE &&
                        player->GetPositionY() >= POS_Y_EAST)
                        {
                            checklife = true;
                        }
                    else if (player->IsAlive() &&
                             player->GetPositionX() <= POS_X_NORTH &&
                             player->GetPositionX() >= POS_X_SOUTH &&
                             player->GetPositionY() >= POS_Y_GATE &&
                             player->GetPositionY() <= POS_Y_WEST)
                             {
                                 checkdead = true;
                             }

                    if (checklife && checkdead)
                        return true;
                }
            }
            return false;
        }

        void OpenGate()
        {
            if (gateOpened)
                return;

            if (GameObject* go = instance->GetGameObject(DATA_GOTHIK_INNER_GATE))
                go->SetGoState(GO_STATE_ACTIVE);

            gateOpened = true;
            Talk(EMOTE_GATE_OPENED);
        }

        void DamageTaken(Unit*, uint32& damage, DamageEffectType, SpellSchoolMask) override
        {
            if (!secondPhase)
            {
                damage = 0;
            }
        }

        void UpdateAI(uint32 diff) override
        {
            if (!IsInRoom())
                return;

            if (!UpdateVictim())
                return;

            // Safety net: if our victim is on the wrong side, find a
            // same-side target or open the gate
            if (secondPhase && me->HasReactState(REACT_AGGRESSIVE) && !gateOpened
                && !IN_LIVE_SIDE(me) != !IN_LIVE_SIDE(me->GetVictim()))
            {
                Map::PlayerList const& pList = me->GetMap()->GetPlayers();
                Player* newTarget = nullptr;
                for (auto const& itr : pList)
                {
                    Player* player = itr.GetSource();
                    if (player && player->IsAlive() && !player->IsGameMaster()
                        && me->IsValidAttackTarget(player)
                        && IN_LIVE_SIDE(me) == IN_LIVE_SIDE(player))
                    {
                        newTarget = player;
                        break;
                    }
                }

                if (newTarget)
                {
                    me->GetThreatMgr().ResetAllThreat();
                    me->GetThreatMgr().AddThreat(newTarget, 1.0f);
                    AttackStart(newTarget);
                }
                else
                    OpenGate();
            }

            events.Update(diff);
            if (me->HasUnitState(UNIT_STATE_CASTING))
                return;

            switch (events.ExecuteEvent())
            {
                case EVENT_INTRO_2:
                    Talk(SAY_INTRO_2);
                    break;
                case EVENT_INTRO_3:
                    Talk(SAY_INTRO_3);
                    break;
                case EVENT_INTRO_4:
                    Talk(SAY_INTRO_4);
                    break;
                case EVENT_SHADOW_BOLT:
                    me->CastSpell(me->GetVictim(), SPELL_SHADOW_BOLT, false);
                    events.Repeat(1s);
                    break;
                case EVENT_HARVEST_SOUL:
                    me->CastSpell(me, SPELL_HARVEST_SOUL, false);
                    events.Repeat(15s);
                    break;
                case EVENT_TELEPORT:
                {
                    if (me->HealthBelowPct(30))
                        break;

                    me->CastStop();
                    me->AttackStop();
                    me->SetReactState(REACT_PASSIVE);
                    me->GetThreatMgr().ResetAllThreat();
                    me->CastSpell(me, lastTeleportDead ? SPELL_TELEPORT_LIVE : SPELL_TELEPORT_DEAD, false);
                    lastTeleportDead = !lastTeleportDead;

                    events.CancelEvent(EVENT_SHADOW_BOLT);
                    events.ScheduleEvent(EVENT_RESUME_ATTACK, 2s);
                    events.Repeat(20s);
                    break;
                }
                case EVENT_RESUME_ATTACK:
                    me->SetReactState(REACT_AGGRESSIVE);
                    events.ScheduleEvent(EVENT_SHADOW_BOLT, 0s);
                    return UpdateAI(0);
                case EVENT_CHECK_HEALTH:
                    if (me->HealthBelowPct(30))
                    {
                        OpenGate();
                        events.CancelEvent(EVENT_TELEPORT);
                        break;
                    }
                    events.Repeat(1s);
                    break;
                case EVENT_SUMMON_ADDS:
                    if (gothikWaves[waveCount][0])
                    {
                        SummonHelpers(gothikWaves[waveCount][0]);
                        events.Repeat(Milliseconds(gothikWaves[waveCount][1]));
                    }
                    else
                    {
                        secondPhase = true;
                        Talk(SAY_PHASE_TWO);
                        Talk(EMOTE_PHASE_TWO);
                        me->CastSpell(me, SPELL_TELEPORT_LIVE, false);
                        me->SetReactState(REACT_AGGRESSIVE);
                        me->RemoveUnitFlag(UNIT_FLAG_DISABLE_MOVE);
                        me->SetImmuneToPC(false);
                        me->RemoveAllAuras();
                        events.ScheduleEvent(EVENT_SHADOW_BOLT, 1s);
                        events.ScheduleEvent(EVENT_HARVEST_SOUL, 5s, 15s);
                        events.ScheduleEvent(EVENT_TELEPORT, 20s);
                        events.ScheduleEvent(EVENT_CHECK_HEALTH, 1s);
                    }
                    waveCount++;
                    break;
                case EVENT_CHECK_PLAYERS:
                    if (!CheckGroupSplitted())
                    {
                        OpenGate();
                        summons.DoForAllSummons([&](WorldObject* summon)
                        {
                            if (Creature* gothikMinion = summon->ToCreature())
                                if (gothikMinion->IsAlive())
                                {
                                    if (Unit* target = SelectTarget(SelectTargetMethod::MinDistance, 0, 200.0f))
                                    {
                                        gothikMinion->AI()->AttackStart(target);
                                        gothikMinion->SetReactState(REACT_AGGRESSIVE);
                                        gothikMinion->SetInCombatWithZone();
                                    }
                                }
                        });
                    }
                    break;
            }
            DoMeleeAttackIfReady();
        }
    };
};

class npc_boss_gothik_minion : public CreatureScript
{
public:
    npc_boss_gothik_minion() : CreatureScript("npc_boss_gothik_minion") { }

    CreatureAI* GetAI(Creature* pCreature) const override
    {
        return GetNaxxramasAI<npc_boss_gothik_minionAI>(pCreature);
    }

    struct npc_boss_gothik_minionAI : public CombatAI
    {
        explicit npc_boss_gothik_minionAI(Creature* c) : CombatAI(c)
        {
            livingSide = IN_LIVE_SIDE(me);
        }
        EventMap events;
        bool livingSide;
        bool IsOnSameSide(Unit const* who) const { return livingSide == IN_LIVE_SIDE(who); }

        void Reset() override
        {
            me->SetReactState(REACT_AGGRESSIVE);
            me->SetNoCallAssistance(false);
            events.Reset();
        }

        void JustEngagedWith(Unit* /*who*/) override
        {
            switch (me->GetEntry())
            {
                case NPC_LIVING_TRAINEE:
                    events.ScheduleEvent(EVENT_DEATH_PLAGUE, 3s);
                    break;
                case NPC_DEAD_TRAINEE:
                    events.ScheduleEvent(EVENT_ARCANE_EXPLOSION, 2500ms);
                    break;
                case NPC_LIVING_KNIGHT:
                    events.ScheduleEvent(EVENT_SHADOW_MARK, 3s);
                    break;
                case NPC_DEAD_KNIGHT:
                    events.ScheduleEvent(EVENT_WHIRLWIND, 2s);
                    break;
                case NPC_LIVING_RIDER:
                    events.ScheduleEvent(EVENT_SHADOW_BOLT_VOLLEY, 3s);
                    break;
                case NPC_DEAD_RIDER:
                    events.ScheduleEvent(EVENT_DRAIN_LIFE, 2s, 3500ms);
                    events.ScheduleEvent(EVENT_UNHOLY_FRENZY, 5s, 9s);
                    break;
                case NPC_DEAD_HORSE:
                    events.ScheduleEvent(EVENT_STOMP, 2s, 5s);
                    break;
            }
        }

        void JustDied(Unit*) override
        {
            switch (me->GetEntry())
            {
                case NPC_LIVING_TRAINEE:
                    DoCastAOE(SPELL_ANCHOR_1_TRAINEE, true);
                    break;
                case NPC_LIVING_KNIGHT:
                    DoCastAOE(SPELL_ANCHOR_1_DK, true);
                    break;
                case NPC_LIVING_RIDER:
                    DoCastAOE(SPELL_ANCHOR_1_RIDER, true);
                    break;
            }
        }

        void KilledUnit(Unit* who) override
        {
            if (who->IsPlayer())
                me->GetInstanceScript()->StorePersistentData(PERSISTENT_DATA_IMMORTAL_FAIL, 1);
        }

        void UpdateAI(uint32 diff) override
        {
            events.Update(diff);
            if (me->GetUnitState() == UNIT_STATE_CASTING)
                return;

            switch (events.ExecuteEvent())
            {
                case EVENT_DEATH_PLAGUE:
                    me->CastSpell(me->GetVictim(), SPELL_DEATH_PLAGUE, false);
                    events.Repeat(4s, 7s);
                    break;
                case EVENT_ARCANE_EXPLOSION:
                    if (Unit* victim = me->GetVictim())
                    {
                        if (victim->IsWithinDist(me, 20))
                        {
                            me->CastSpell(victim, SPELL_ARCANE_EXPLOSION, false);
                        }
                    }
                    events.Repeat(2500ms);
                    break;
                case EVENT_SHADOW_MARK:
                    if (Unit* victim = me->GetVictim())
                    {
                        if (victim->IsWithinDist(me, 10))
                        {
                            me->CastSpell(victim, SPELL_SHADOW_MARK, false);
                        }
                    }
                    events.Repeat(5s, 7s);
                    break;
                case EVENT_WHIRLWIND:
                    if (Unit* victim = me->GetVictim())
                    {
                        if (victim->IsWithinDist(me, 10))
                        {
                            me->CastSpell(victim, SPELL_WHIRLWIND, false);
                        }
                    }
                    events.Repeat(4s, 6s);
                    break;
                case EVENT_SHADOW_BOLT_VOLLEY:
                    me->CastSpell(me->GetVictim(), SPELL_SHADOW_BOLT_VOLLEY, false);
                    events.Repeat(5s);
                    break;
                case EVENT_DRAIN_LIFE:
                    if (Unit* victim = me->GetVictim())
                    {
                        if (victim->IsWithinDist(me, 20))
                        {
                            me->CastSpell(victim, SPELL_DRAIN_LIFE, false);
                        }
                    }
                    events.Repeat(8s, 12s);
                    break;
                case EVENT_UNHOLY_FRENZY:
                    me->AddAura(SPELL_UNHOLY_FRENZY, me);
                    events.Repeat(15s, 17s);
                    break;
                case EVENT_STOMP:
                    if (Unit* victim = me->GetVictim())
                    {
                        if (victim->IsWithinDist(me, 10))
                        {
                            me->CastSpell(victim, SPELL_STOMP, false);
                        }
                    }
                    events.Repeat(4s, 9s);
                    break;
            }
            DoMeleeAttackIfReady();
        }
    };
};

class npc_gothik_trigger : public CreatureScript
{
public:
    npc_gothik_trigger() : CreatureScript("npc_gothik_trigger") { }

    CreatureAI* GetAI(Creature* creature) const override
    {
        return new npc_gothik_triggerAI(creature);
    }

    struct npc_gothik_triggerAI : public ScriptedAI
    {
        npc_gothik_triggerAI(Creature* creature) : ScriptedAI(creature) { creature->SetDisableGravity(true); }

        void EnterEvadeMode(EvadeReason /*why*/) override {}
        void UpdateAI(uint32 /*diff*/) override {}
        void JustEngagedWith(Unit* /*who*/) override {}
        void DamageTaken(Unit* /*who*/, uint32& damage, DamageEffectType /*damagetype*/, SpellSchoolMask /*damageSchoolMask*/) override { damage = 0; }

        Creature* SelectRandomSkullPile()
        {
            std::list<Creature*> triggers;
            me->GetCreatureListWithEntryInGrid(triggers, NPC_TRIGGER, 150.0f);
            // Remove triggers that are on live side or soul triggers on the platform
            triggers.remove_if([](Creature* trigger){
                return ((trigger->GetPositionY() < POS_Y_GATE) || (trigger->GetPositionZ() > 280.0f));
                });
            if (!triggers.empty())
            {
                std::list<Creature*>::iterator itr = triggers.begin();
                std::advance(itr, urand(0, triggers.size() - 1));
                return *itr;
            }
            return nullptr;
        }

        void SpellHit(Unit* /*caster*/, SpellInfo const* spell) override
        {
            if (!spell)
            {
                return;
            }

            switch (spell->Id)
            {
                case SPELL_ANCHOR_1_TRAINEE:
                    DoCastAOE(SPELL_ANCHOR_2_TRAINEE, true);
                    break;
                case SPELL_ANCHOR_1_DK:
                    DoCastAOE(SPELL_ANCHOR_2_DK, true);
                    break;
                case SPELL_ANCHOR_1_RIDER:
                    DoCastAOE(SPELL_ANCHOR_2_RIDER, true);
                    break;
                case SPELL_ANCHOR_2_TRAINEE:
                    if (Creature* target = SelectRandomSkullPile())
                    {
                        DoCast(target, SPELL_SKULLS_TRAINEE, true);
                    }
                    break;
                case SPELL_ANCHOR_2_DK:
                    if (Creature* target = SelectRandomSkullPile())
                    {
                        DoCast(target, SPELL_SKULLS_DK, true);
                    }
                    break;
                case SPELL_ANCHOR_2_RIDER:
                    if (Creature* target = SelectRandomSkullPile())
                    {
                        DoCast(target, SPELL_SKULLS_RIDER, true);
                    }
                    break;
                case SPELL_SKULLS_TRAINEE:
                    DoSummon(NPC_DEAD_TRAINEE, me, 0.0f, 15 * IN_MILLISECONDS, TEMPSUMMON_CORPSE_TIMED_DESPAWN);
                    break;
                case SPELL_SKULLS_DK:
                    DoSummon(NPC_DEAD_KNIGHT, me, 0.0f, 15 * IN_MILLISECONDS, TEMPSUMMON_CORPSE_TIMED_DESPAWN);
                    break;
                case SPELL_SKULLS_RIDER:
                    DoSummon(NPC_DEAD_RIDER, me, 0.0f, 15 * IN_MILLISECONDS, TEMPSUMMON_CORPSE_TIMED_DESPAWN);
                    DoSummon(NPC_DEAD_HORSE, me, 0.0f, 15 * IN_MILLISECONDS, TEMPSUMMON_CORPSE_TIMED_DESPAWN);
                    break;
            }
        }

        // dead side summons are "owned" by gothik
        void JustSummoned(Creature* summon) override
        {
            if (Creature* gothik = me->GetInstanceScript()->GetCreature(DATA_GOTHIK_BOSS))
                gothik->AI()->JustSummoned(summon);
        }

        void SummonedCreatureDespawn(Creature* summon) override
        {
            if (Creature* gothik = me->GetInstanceScript()->GetCreature(DATA_GOTHIK_BOSS))
                gothik->AI()->SummonedCreatureDespawn(summon);
        }
    };
};

class spell_gothik_shadow_bolt_volley : public SpellScript
{
    PrepareSpellScript(spell_gothik_shadow_bolt_volley);

    bool Validate(SpellInfo const* /*spellInfo*/) override
    {
        return ValidateSpellInfo({ SPELL_SHADOW_MARK });
    }

    void FilterTargets(std::list<WorldObject*>& targets)
    {
        targets.remove_if(Acore::UnitAuraCheck(false, SPELL_SHADOW_MARK));
    }

    void Register() override
    {
        OnObjectAreaTargetSelect += SpellObjectAreaTargetSelectFn(spell_gothik_shadow_bolt_volley::FilterTargets, EFFECT_0, TARGET_UNIT_SRC_AREA_ENEMY);
    }
};

void AddSC_boss_gothik()
{
    new boss_gothik();
    new npc_boss_gothik_minion();
    new npc_gothik_trigger();
    RegisterSpellScript(spell_gothik_shadow_bolt_volley);
}