/*
 * 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 "ScriptMgr.h"
#include "ObjectAccessor.h"
#include "ScriptedCreature.h"

enum Spells
{
    SPELL_ARCANE_EXPLOSION                  = 46608,
    SPELL_CONE_OF_COLD                      = 38384,
    SPELL_FIREBALL                          = 46988,
    SPELL_FROSTBOLT                         = 46987,
    SPELL_SUMMON_WATER_ELEMENTAL            = 45067,
    SPELL_ICEBLOCK                          = 46604
};

enum Texts
{
    SAY_AGGRO                              = 0,
    SAY_EVADE                              = 1,
    SAY_SALVATION                          = 2,
};

enum Action
{
    ACTION_BUFF_YELL                        = -30001 // shared from Battleground
};

enum Events
{
    // Balinda
    EVENT_ARCANE_EXPLOSION = 1,
    EVENT_CONE_OF_COLD,
    EVENT_FIREBOLT,
    EVENT_FROSTBOLT,
    EVENT_SUMMON_WATER_ELEMENTAL,
    EVENT_CHECK_RESET,          // Checks if Balinda or the Water Elemental are outside of building.
};

struct boss_balinda : public ScriptedAI
{
    boss_balinda(Creature* creature) : ScriptedAI(creature), summons(me)
    {
        Initialize();
    }

    void Initialize()
    {
        WaterElementalGUID.Clear();
        HasCastIceblock = false;
    }

    void Reset() override
    {
        Initialize();
        events.Reset();
        summons.DespawnAll();
    }

    void JustEngagedWith(Unit* /*who*/) override
    {
        Talk(SAY_AGGRO);
        events.ScheduleEvent(EVENT_ARCANE_EXPLOSION, 5s, 15s);
        events.ScheduleEvent(EVENT_CONE_OF_COLD, 8s);
        events.ScheduleEvent(EVENT_FIREBOLT, 1s);
        events.ScheduleEvent(EVENT_FROSTBOLT, 4s);
        events.ScheduleEvent(EVENT_SUMMON_WATER_ELEMENTAL, 3s);
        events.ScheduleEvent(EVENT_CHECK_RESET, 5s);
    }

    void JustSummoned(Creature* summoned) override
    {
        summoned->AI()->AttackStart(SelectTarget(SelectTargetMethod::Random, 0, 50, true));
        summoned->SetFaction(me->GetFaction());
        WaterElementalGUID = summoned->GetGUID();
        summons.Summon(summoned);
    }

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

    void JustDied(Unit* /*killer*/) override
    {
        summons.DespawnAll();
    }

    void DoAction(int32 actionId) override
    {
        if (actionId == ACTION_BUFF_YELL)
            Talk(SAY_AGGRO);
    }

    void DamageTaken(Unit* /*attacker*/, uint32& damage, DamageEffectType /*damageType*/, SpellInfo const* /*spellInfo = nullptr*/) override
    {
        if (me->HealthBelowPctDamaged(40, damage) && !HasCastIceblock)
        {
            DoCast(SPELL_ICEBLOCK);
            HasCastIceblock = true;
        }
    }

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

        events.Update(diff);

        if (me->HasUnitState(UNIT_STATE_CASTING))
            return;

        while (uint32 eventId = events.ExecuteEvent())
        {
            switch (eventId)
            {
                case EVENT_ARCANE_EXPLOSION:
                    DoCastVictim(SPELL_ARCANE_EXPLOSION);
                    events.ScheduleEvent(EVENT_ARCANE_EXPLOSION, 5s, 15s);
                    break;
                case EVENT_CONE_OF_COLD:
                    DoCastVictim(SPELL_CONE_OF_COLD);
                    events.ScheduleEvent(EVENT_CONE_OF_COLD, 10s, 20s);
                    break;
                case EVENT_FIREBOLT:
                    DoCastVictim(SPELL_FIREBALL);
                    events.ScheduleEvent(EVENT_FIREBOLT, 5s, 9s);
                    break;
                case EVENT_FROSTBOLT:
                    DoCastVictim(SPELL_FROSTBOLT);
                    events.ScheduleEvent(EVENT_FROSTBOLT, 4s, 12s);
                    break;
                case EVENT_SUMMON_WATER_ELEMENTAL:
                    if (summons.empty())
                        DoCast(SPELL_SUMMON_WATER_ELEMENTAL);
                    events.ScheduleEvent(EVENT_SUMMON_WATER_ELEMENTAL, 50s);
                    break;
                case EVENT_CHECK_RESET:
                    if (me->GetDistance2d(me->GetHomePosition().GetPositionX(), me->GetHomePosition().GetPositionY()) > 50)
                    {
                        EnterEvadeMode();
                        Talk(SAY_EVADE);
                    }
                    if (Creature* elemental = ObjectAccessor::GetCreature(*me, WaterElementalGUID))
                        if (elemental->GetDistance2d(me->GetHomePosition().GetPositionX(), me->GetHomePosition().GetPositionY()) > 50)
                            elemental->AI()->EnterEvadeMode();
                    events.ScheduleEvent(EVENT_CHECK_RESET, 5s);
                    break;
                default:
                    break;
            }

            if (me->HasUnitState(UNIT_STATE_CASTING))
                return;
        }
    }

private:
    EventMap events;
    SummonList summons;
    ObjectGuid WaterElementalGUID;
    bool HasCastIceblock;
};

void AddSC_boss_balinda()
{
    RegisterCreatureAI(boss_balinda);
}