/*
 * 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 "CreatureScript.h"
#include "ScriptedCreature.h"
#include "zulgurub.h"

enum Spells
{
    SPELL_AVATAR                    = 24646, // Enrage Spell
    SPELL_GROUND_TREMOR             = 6524,
    SPELL_ENTANGLING_ROOTS          = 24648,
    SPELL_SWEEPING_STRIKES          = 18765
};

enum Events
{
    EVENT_AVATAR                    = 1,
    EVENT_GROUND_TREMOR             = 2,
    EVENT_START_PURSUIT             = 3,
    EVENT_STOP_PURSUIT              = 4,
    EVENT_ENTANGLING_ROOTS          = 5,
    EVENT_SWEEPING_STRIKES          = 6
};

class boss_grilek : public CreatureScript // grilek
{
public:
    boss_grilek() : CreatureScript("boss_grilek") { }

    struct boss_grilekAI : public BossAI
    {
        boss_grilekAI(Creature* creature) : BossAI(creature, DATA_EDGE_OF_MADNESS)
        {
        }

        void Reset() override
        {
            _pursuitTargetGUID.Clear();
            BossAI::Reset();
        }

        void JustEngagedWith(Unit* /*who*/) override
        {
            _JustEngagedWith();
            events.ScheduleEvent(EVENT_AVATAR, 20s, 30s);
            events.ScheduleEvent(EVENT_GROUND_TREMOR, 15s, 25s);
            events.ScheduleEvent(EVENT_ENTANGLING_ROOTS, 5s, 15s);
            events.ScheduleEvent(EVENT_SWEEPING_STRIKES, 30s);
        }

        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_AVATAR:
                        if (Unit* target = SelectTarget(SelectTargetMethod::Random, 0))
                        {
                            _pursuitTargetGUID = target->GetGUID();
                        }
                        DoCast(me, SPELL_AVATAR);
                        me->SetReactState(REACT_PASSIVE);
                        DoResetThreatList();
                        events.ScheduleEvent(EVENT_START_PURSUIT, 2s);
                        events.ScheduleEvent(EVENT_STOP_PURSUIT, 15s);
                        events.ScheduleEvent(EVENT_AVATAR, 45s, 50s);
                        break;
                    case EVENT_GROUND_TREMOR:
                        DoCastVictim(SPELL_GROUND_TREMOR, true);
                        events.ScheduleEvent(EVENT_GROUND_TREMOR, 12s, 16s);
                        break;
                    case EVENT_START_PURSUIT:
                        me->SetReactState(REACT_AGGRESSIVE);
                        if (Unit* pursuitTarget = ObjectAccessor::GetUnit(*me, _pursuitTargetGUID))
                        {
                            me->GetThreatMgr().AddThreat(pursuitTarget, 1000000.f);
                        }
                        break;
                    case EVENT_STOP_PURSUIT:
                        if (Unit* pursuitTarget = ObjectAccessor::GetUnit(*me, _pursuitTargetGUID))
                        {
                            _pursuitTargetGUID.Clear();
                            me->GetThreatMgr().AddThreat(pursuitTarget, -1000000.f);
                        }
                        break;
                    case EVENT_ENTANGLING_ROOTS:
                        DoCastVictim(SPELL_ENTANGLING_ROOTS);
                        events.ScheduleEvent(EVENT_ENTANGLING_ROOTS, 10s, 20s);
                        break;
                    case EVENT_SWEEPING_STRIKES:
                        DoCastSelf(SPELL_SWEEPING_STRIKES, true);
                        events.ScheduleEvent(EVENT_SWEEPING_STRIKES, 30s);
                        break;
                    default:
                        break;
                }
            }

            DoMeleeAttackIfReady();
        }

    private:
        ObjectGuid _pursuitTargetGUID;
    };

    CreatureAI* GetAI(Creature* creature) const override
    {
        return GetZulGurubAI<boss_grilekAI>(creature);
    }
};

void AddSC_boss_grilek()
{
    new boss_grilek();
}