/*
 * Copyright (C) 2016+     AzerothCore <www.azerothcore.org>, released under GNU GPL v2 license: http://github.com/azerothcore/azerothcore-wotlk/LICENSE-GPL2
 * Copyright (C) 2008-2016 TrinityCore <http://www.trinitycore.org/>
 * Copyright (C) 2005-2009 MaNGOS <http://getmangos.com/>
 */

#include "ScriptMgr.h"
#include "ScriptedCreature.h"
#include "SpellScript.h"
#include "ruins_of_ahnqiraj.h"

enum Emotes
{
    EMOTE_TARGET                = 0
};

enum Spells
{
    SPELL_CREEPING_PLAGUE       = 20512,
    SPELL_DISMEMBER             = 96,
    SPELL_GATHERING_SPEED       = 1834,
    SPELL_FULL_SPEED            = 1557,
    SPELL_THORNS                = 25640,
    SPELL_BURU_TRANSFORM        = 24721,
    SPELL_SUMMON_HATCHLING      = 1881,
    SPELL_EXPLODE               = 19593,
    SPELL_EXPLODE_2             = 5255,
    SPELL_BURU_EGG_TRIGGER      = 26646
};

enum Events
{
    EVENT_DISMEMBER             = 1,
    EVENT_GATHERING_SPEED       = 2,
    EVENT_FULL_SPEED            = 3,
    EVENT_CREEPING_PLAGUE       = 4,
    EVENT_RESPAWN_EGG           = 5
};

enum Phases
{
    PHASE_EGG                   = 0,
    PHASE_TRANSFORM             = 1
};

enum Actions
{
    ACTION_EXPLODE              = 0
};

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

        struct boss_buruAI : public BossAI
        {
            boss_buruAI(Creature* creature) : BossAI(creature, DATA_BURU)
            {
            }

            void EnterEvadeMode()
            {
                BossAI::EnterEvadeMode();

                for (std::list<uint64>::iterator i = Eggs.begin(); i != Eggs.end(); ++i)
                    if (Creature* egg = me->GetMap()->GetCreature(*Eggs.begin()))
                        egg->Respawn();

                Eggs.clear();
            }

            void EnterCombat(Unit* who)
            {
                _EnterCombat();
                Talk(EMOTE_TARGET, who);
                DoCast(me, SPELL_THORNS);

                events.ScheduleEvent(EVENT_DISMEMBER, 5000);
                events.ScheduleEvent(EVENT_GATHERING_SPEED, 9000);
                events.ScheduleEvent(EVENT_FULL_SPEED, 60000);

                _phase = PHASE_EGG;
            }

            void DoAction(int32 action)
            {
                if (action == ACTION_EXPLODE)
                    if (_phase == PHASE_EGG)
                        Unit::DealDamage(me, me, 45000);
            }

            void KilledUnit(Unit* victim)
            {
                if (victim->GetTypeId() == TYPEID_PLAYER)
                    ChaseNewVictim();
            }

            void ChaseNewVictim()
            {
                if (_phase != PHASE_EGG)
                    return;

                me->RemoveAurasDueToSpell(SPELL_FULL_SPEED);
                me->RemoveAurasDueToSpell(SPELL_GATHERING_SPEED);
                events.ScheduleEvent(EVENT_GATHERING_SPEED, 9000);
                events.ScheduleEvent(EVENT_FULL_SPEED, 60000);

                if (Unit* victim = SelectTarget(SELECT_TARGET_RANDOM, 0, 0.0f, true))
                {
                    DoResetThreat();
                    AttackStart(victim);
                    Talk(EMOTE_TARGET, victim);
                }
            }

            void ManageRespawn(uint64 EggGUID)
            {
                ChaseNewVictim();
                Eggs.push_back(EggGUID);
                events.ScheduleEvent(EVENT_RESPAWN_EGG, 100000);
            }

            void UpdateAI(uint32 diff)
            {
                if (!UpdateVictim())
                    return;

                events.Update(diff);

                while (uint32 eventId = events.ExecuteEvent())
                {
                    switch (eventId)
                    {
                        case EVENT_DISMEMBER:
                            DoCastVictim(SPELL_DISMEMBER);
                            events.ScheduleEvent(EVENT_DISMEMBER, 5000);
                            break;
                        case EVENT_GATHERING_SPEED:
                            DoCast(me, SPELL_GATHERING_SPEED);
                            events.ScheduleEvent(EVENT_GATHERING_SPEED, 9000);
                            break;
                        case EVENT_FULL_SPEED:
                            DoCast(me, SPELL_FULL_SPEED);
                            break;
                        case EVENT_CREEPING_PLAGUE:
                            DoCast(me, SPELL_CREEPING_PLAGUE);
                            events.ScheduleEvent(EVENT_CREEPING_PLAGUE, 6000);
                            break;
                        case EVENT_RESPAWN_EGG:
                            if (Creature* egg = me->GetMap()->GetCreature(*Eggs.begin()))
                            {
                                egg->Respawn();
                                Eggs.pop_front();
                            }
                            break;
                        default:
                            break;
                    }
                }

                if (me->GetHealthPct() < 20.0f && _phase == PHASE_EGG)
                {
                    DoCast(me, SPELL_BURU_TRANSFORM); // Enrage
                    DoCast(me, SPELL_FULL_SPEED, true);
                    me->RemoveAurasDueToSpell(SPELL_THORNS);
                    _phase = PHASE_TRANSFORM;
                }

                DoMeleeAttackIfReady();
            }
        private:
            uint8 _phase;
            std::list<uint64> Eggs;
        };

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

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

        struct npc_buru_eggAI : public ScriptedAI
        {
            npc_buru_eggAI(Creature* creature) : ScriptedAI(creature)
            {
                _instance = me->GetInstanceScript();
                SetCombatMovement(false);
            }

            void EnterCombat(Unit* attacker)
            {
                if (Creature* buru = me->GetMap()->GetCreature(_instance->GetData64(DATA_BURU)))
                    if (!buru->IsInCombat())
                        buru->AI()->AttackStart(attacker);
            }

            void JustSummoned(Creature* who)
            {
                if (who->GetEntry() == NPC_HATCHLING)
                    if (Creature* buru = me->GetMap()->GetCreature(_instance->GetData64(DATA_BURU)))
                        if (Unit* target = buru->AI()->SelectTarget(SELECT_TARGET_RANDOM))
                            who->AI()->AttackStart(target);
            }

            void JustDied(Unit* /*killer*/)
            {
                DoCastAOE(SPELL_EXPLODE, true);
                DoCastAOE(SPELL_EXPLODE_2, true); // Unknown purpose
                DoCast(me, SPELL_SUMMON_HATCHLING, true);

                if (Creature* buru = me->GetMap()->GetCreature(_instance->GetData64(DATA_BURU)))
                    if (boss_buru::boss_buruAI* buruAI = dynamic_cast<boss_buru::boss_buruAI*>(buru->AI()))
                        buruAI->ManageRespawn(me->GetGUID());
            }
        private:
            InstanceScript* _instance;
        };

        CreatureAI* GetAI(Creature* creature) const
        {
            return GetInstanceAI<npc_buru_eggAI>(creature);
        }
};

class spell_egg_explosion : public SpellScriptLoader
{
    public:
        spell_egg_explosion() : SpellScriptLoader("spell_egg_explosion") { }

        class spell_egg_explosion_SpellScript : public SpellScript
        {
            PrepareSpellScript(spell_egg_explosion_SpellScript);

            void HandleAfterCast()
            {
                if (Creature* buru = GetCaster()->FindNearestCreature(NPC_BURU, 5.f))
                    buru->AI()->DoAction(ACTION_EXPLODE);
            }

            void HandleDummyHitTarget(SpellEffIndex /*effIndex*/)
            {
                if (Unit* target = GetHitUnit())
                    Unit::DealDamage(GetCaster(), target, -16 * GetCaster()->GetDistance(target) + 500);
            }

            void Register()
            {
                AfterCast += SpellCastFn(spell_egg_explosion_SpellScript::HandleAfterCast);
                OnEffectHitTarget += SpellEffectFn(spell_egg_explosion_SpellScript::HandleDummyHitTarget, EFFECT_0, SPELL_EFFECT_DUMMY);
            }
        };

        SpellScript* GetSpellScript() const
        {
            return new spell_egg_explosion_SpellScript();
        }
};

void AddSC_boss_buru()
{
    new boss_buru();
    new npc_buru_egg();
    new spell_egg_explosion();
}
