/*
 * 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 "ScriptedCreature.h"

enum Spells
{
    SPELL_WHIRLWIND                               = 15589,
    SPELL_WHIRLWIND2                              = 13736,
    SPELL_KNOCKDOWN                               = 19128,
    SPELL_FRENZY                                  = 8269,
    SPELL_SWEEPING_STRIKES                        = 18765, // not sure
    SPELL_CLEAVE                                  = 20677, // not sure
    SPELL_WINDFURY                                = 35886, // not sure
    SPELL_STORMPIKE                               = 51876  // not sure
};

enum Texts
{
    SAY_AGGRO                                    = 0,
    SAY_EVADE                                    = 1,
    SAY_RESPAWN                                  = 2,
    SAY_RANDOM                                   = 3
};

enum Events
{
    EVENT_WHIRLWIND = 1,
    EVENT_WHIRLWIND2,
    EVENT_KNOCKDOWN,
    EVENT_FRENZY,
    EVENT_RANDOM_YELL
};

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

    void Reset() override
    {
        events.Reset();
    }

    void JustEngagedWith(Unit* /*who*/) override
    {
        Talk(SAY_AGGRO);
        events.ScheduleEvent(EVENT_WHIRLWIND, 1s, 20s);
        events.ScheduleEvent(EVENT_WHIRLWIND2, 1s, 20s);
        events.ScheduleEvent(EVENT_KNOCKDOWN, 12s);
        events.ScheduleEvent(EVENT_FRENZY, 6s);
        events.ScheduleEvent(EVENT_RANDOM_YELL, 20s, 30s);
    }

    void JustAppeared() override
    {
        Reset();
        Talk(SAY_RESPAWN);
    }

    bool CheckInRoom() override
    {
        if (me->GetDistance2d(me->GetHomePosition().GetPositionX(), me->GetHomePosition().GetPositionY()) > 50)
        {
            EnterEvadeMode();
            Talk(SAY_EVADE);
            return false;
        }

        return true;
    }

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

        events.Update(diff);

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

        while (uint32 eventId = events.ExecuteEvent())
        {
            switch (eventId)
            {
                case EVENT_WHIRLWIND:
                    DoCastVictim(SPELL_WHIRLWIND);
                    events.ScheduleEvent(EVENT_WHIRLWIND, 8s, 18s);
                    break;
                case EVENT_WHIRLWIND2:
                    DoCastVictim(SPELL_WHIRLWIND2);
                    events.ScheduleEvent(EVENT_WHIRLWIND2, 7s, 25s);
                    break;
                case EVENT_KNOCKDOWN:
                    DoCastVictim(SPELL_KNOCKDOWN);
                    events.ScheduleEvent(EVENT_KNOCKDOWN, 10s, 15s);
                    break;
                case EVENT_FRENZY:
                    DoCastVictim(SPELL_FRENZY);
                    events.ScheduleEvent(EVENT_FRENZY, 20s, 30s);
                    break;
                case EVENT_RANDOM_YELL:
                    Talk(SAY_RANDOM);
                    events.ScheduleEvent(EVENT_RANDOM_YELL, 20s, 30s);
                    break;
                default:
                    break;
            }

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

    private:
        EventMap events;
};

void AddSC_boss_drekthar()
{
    RegisterCreatureAI(boss_drekthar);
}