/*
 * 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 Affero General Public License as published by the
 * Free Software Foundation; either version 3 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 Affero 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 "ScriptedCreature.h"

enum Texts
{
    SAY_AGGRO       = 0,
    SAY_EARTHQUAKE  = 1,
    SAY_OVERRUN     = 2,
    SAY_SLAY        = 3,
    SAY_DEATH       = 4
};

enum Spells
{
    SPELL_EARTHQUAKE        = 32686,
    SPELL_SUNDER_ARMOR      = 33661,
    SPELL_CHAIN_LIGHTNING   = 33665,
    SPELL_OVERRUN           = 32636,
    SPELL_ENRAGE            = 33653,
    SPELL_MARK_DEATH        = 37128,
    SPELL_AURA_DEATH        = 37131
};

enum Events
{
    EVENT_ENRAGE    = 1,
    EVENT_ARMOR     = 2,
    EVENT_CHAIN     = 3,
    EVENT_QUAKE     = 4,
    EVENT_OVERRUN   = 5
};

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

    struct boss_doomwalkerAI : public ScriptedAI
    {
        boss_doomwalkerAI(Creature* creature) : ScriptedAI(creature)
        {
        }

        void Reset() override
        {
            _events.Reset();
            _events.ScheduleEvent(EVENT_ENRAGE, 0);
            _events.ScheduleEvent(EVENT_ARMOR, urand(5000, 13000));
            _events.ScheduleEvent(EVENT_CHAIN, urand(10000, 30000));
            _events.ScheduleEvent(EVENT_QUAKE, urand(25000, 35000));
            _events.ScheduleEvent(EVENT_OVERRUN, urand(30000, 45000));
            _inEnrage = false;
        }

        void KilledUnit(Unit* victim) override
        {
            victim->CastSpell(victim, SPELL_MARK_DEATH, 0);

            if (urand(0, 4))
                return;

            Talk(SAY_SLAY);
        }

        void JustDied(Unit* /*killer*/) override
        {
            Talk(SAY_DEATH);
        }

        void EnterCombat(Unit* /*who*/) override
        {
            Talk(SAY_AGGRO);
        }

        void MoveInLineOfSight(Unit* who) override
        {
            if (who && who->GetTypeId() == TYPEID_PLAYER && me->IsValidAttackTarget(who))
                if (who->HasAura(SPELL_MARK_DEATH) && !who->HasAura(27827)) // Spirit of Redemption
                    who->CastSpell(who, SPELL_AURA_DEATH, 1);
        }

        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_ENRAGE:
                        if (!HealthAbovePct(20))
                        {
                            DoCast(me, SPELL_ENRAGE);
                            _events.ScheduleEvent(EVENT_ENRAGE, 6000);
                            _inEnrage = true;
                        }
                        break;
                    case EVENT_OVERRUN:
                        Talk(SAY_OVERRUN);
                        DoCastVictim(SPELL_OVERRUN);
                        _events.ScheduleEvent(EVENT_OVERRUN, urand(25000, 40000));
                        break;
                    case EVENT_QUAKE:
                        if (urand(0, 1))
                            return;

                        Talk(SAY_EARTHQUAKE);

                        //remove enrage before casting earthquake because enrage + earthquake = 16000dmg over 8sec and all dead
                        if (_inEnrage)
                            me->RemoveAurasDueToSpell(SPELL_ENRAGE);

                        DoCast(me, SPELL_EARTHQUAKE);
                        _events.ScheduleEvent(EVENT_QUAKE, urand(30000, 55000));
                        break;
                    case EVENT_CHAIN:
                        if (Unit* target = SelectTarget(SELECT_TARGET_RANDOM, 1, 0.0f, true))
                            DoCast(target, SPELL_CHAIN_LIGHTNING);
                        _events.ScheduleEvent(EVENT_CHAIN, urand(7000, 27000));
                        break;
                    case EVENT_ARMOR:
                        DoCastVictim(SPELL_SUNDER_ARMOR);
                        _events.ScheduleEvent(EVENT_ARMOR, urand(10000, 25000));
                        break;
                    default:
                        break;
                }
            }
            DoMeleeAttackIfReady();
        }

    private:
        EventMap _events;
        bool _inEnrage;
    };

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

void AddSC_boss_doomwalker()
{
    new boss_doomwalker();
}