/*
 * 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 "CreatureAIImpl.h"
#include "MotionMaster.h"
#include "ObjectAccessor.h"
#include "Player.h"
#include "ScriptedCreature.h"
#include "SpellInfo.h"
#include "SpellScript.h"
#include "TemporarySummon.h"
#include "Vehicle.h"

enum Texts
{
    // Tiger Matriarch Credit
    SAY_MATRIARCH_AGGRO     = 0,

    // Troll Volunteer
    SAY_VOLUNTEER_START     = 0,
    SAY_VOLUNTEER_END       = 1,
};

enum Spells
{
    // Tiger Matriarch Credit
    SPELL_SUMMON_MATRIARCH              = 75187,
    SPELL_NO_SUMMON_AURA                = 75213,
    SPELL_DETECT_INVIS                  = 75180,
    SPELL_SUMMON_ZENTABRA_TRIGGER       = 75212,

    // Tiger Matriarch
    SPELL_POUNCE                        = 61184,
    SPELL_FURIOUS_BITE                  = 75164,
    SPELL_SUMMON_ZENTABRA               = 75181,
    SPELL_SPIRIT_OF_THE_TIGER_RIDER     = 75166,
    SPELL_EJECT_PASSENGERS              = 50630,

    // Troll Volunteer
    SPELL_VOLUNTEER_AURA                = 75076,
    SPELL_PETACT_AURA                   = 74071,
    SPELL_QUEST_CREDIT                  = 75106,
    SPELL_MOUNTING_CHECK                = 75420,
    SPELL_TURNIN                        = 73953,
    SPELL_AOE_TURNIN                    = 75107,

    // Vol'jin War Drums
    SPELL_MOTIVATE_1                    = 75088,
    SPELL_MOTIVATE_2                    = 75086,
};

enum Creatures
{
    // Tiger Matriarch Credit
    NPC_TIGER_VEHICLE                   = 40305,

    // Troll Volunteer
    NPC_URUZIN                          = 40253,
    NPC_VOLUNTEER_1                     = 40264,
    NPC_VOLUNTEER_2                     = 40260,

    // Vol'jin War Drums
    NPC_CITIZEN_1                       = 40256,
    NPC_CITIZEN_2                       = 40257,
};

enum Events
{
    // Tiger Matriarch Credit
    EVENT_CHECK_SUMMON_AURA             = 1,

    // Tiger Matriarch
    EVENT_POUNCE                        = 2,
    EVENT_NOSUMMON                      = 3,
};

enum Points
{
    POINT_URUZIN                        = 4026400,
};

struct npc_tiger_matriarch_credit : public ScriptedAI
{
   npc_tiger_matriarch_credit(Creature* creature) : ScriptedAI(creature)
   {
       SetCombatMovement(false);
       events.ScheduleEvent(EVENT_CHECK_SUMMON_AURA, 2s);
   }

    void UpdateAI(uint32 diff) override
    {
        events.Update(diff);

        if (events.ExecuteEvent() == EVENT_CHECK_SUMMON_AURA)
        {
            std::list<Creature*> tigers;
            GetCreatureListWithEntryInGrid(tigers, me, NPC_TIGER_VEHICLE, 15.0f);
            if (!tigers.empty())
            {
                for (std::list<Creature*>::iterator itr = tigers.begin(); itr != tigers.end(); ++itr)
                {
                    if (!(*itr)->IsSummon())
                        continue;

                    if (Unit* summoner = (*itr)->ToTempSummon()->GetSummonerUnit())
                        if (!summoner->HasAura(SPELL_NO_SUMMON_AURA) && !summoner->HasAura(SPELL_SUMMON_ZENTABRA_TRIGGER)
                            && !summoner->IsInCombat())
                        {
                            me->AddAura(SPELL_NO_SUMMON_AURA, summoner);
                            me->AddAura(SPELL_DETECT_INVIS, summoner);
                            summoner->CastSpell(summoner, SPELL_SUMMON_MATRIARCH, true);
                            Talk(SAY_MATRIARCH_AGGRO, summoner);
                        }
                }
            }

            events.ScheduleEvent(EVENT_CHECK_SUMMON_AURA, 5s);
        }
    }

private:
    EventMap events;
};

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

    void JustEngagedWith(Unit* /*target*/) override
    {
        _events.Reset();
        _events.ScheduleEvent(EVENT_POUNCE, 100ms);
        _events.ScheduleEvent(EVENT_NOSUMMON, 50s);
    }

    void IsSummonedBy(WorldObject* summonerWO) override
    {
        Player* summoner = summonerWO->ToPlayer();
        if (!summoner || !summoner->GetVehicle())
            return;

        _tigerGuid = summoner->GetVehicle()->GetBase()->GetGUID();
        if (Unit* tiger = ObjectAccessor::GetUnit(*me, _tigerGuid))
        {
            AddThreat(tiger, 500000.0f);
            DoCast(me, SPELL_FURIOUS_BITE);
        }
    }

    void KilledUnit(Unit* victim) override
    {
        if (victim->GetTypeId() != TYPEID_UNIT || !victim->IsSummon())
            return;

        if (Unit* vehSummoner = victim->ToTempSummon()->GetSummonerUnit())
        {
            vehSummoner->RemoveAurasDueToSpell(SPELL_NO_SUMMON_AURA);
            vehSummoner->RemoveAurasDueToSpell(SPELL_DETECT_INVIS);
            vehSummoner->RemoveAurasDueToSpell(SPELL_SPIRIT_OF_THE_TIGER_RIDER);
            vehSummoner->RemoveAurasDueToSpell(SPELL_SUMMON_ZENTABRA_TRIGGER);
        }
        me->DespawnOrUnsummon();
    }

    void DamageTaken(Unit* attacker, uint32& damage, DamageEffectType /*damageType*/, SpellInfo const* /*spellInfo = nullptr*/) override
    {
        if (!attacker || !attacker->IsSummon())
            return;

        if (HealthBelowPct(20))
        {
            damage = 0;
            me->SetUnitFlag(UNIT_FLAG_NON_ATTACKABLE);
            if (Unit* vehSummoner = attacker->ToTempSummon()->GetSummonerUnit())
            {
                vehSummoner->AddAura(SPELL_SUMMON_ZENTABRA_TRIGGER, vehSummoner);
                vehSummoner->CastSpell(vehSummoner, SPELL_SUMMON_ZENTABRA, true);
                attacker->CastSpell(attacker, SPELL_EJECT_PASSENGERS, true);
                vehSummoner->RemoveAurasDueToSpell(SPELL_NO_SUMMON_AURA);
                vehSummoner->RemoveAurasDueToSpell(SPELL_DETECT_INVIS);
                vehSummoner->RemoveAurasDueToSpell(SPELL_SPIRIT_OF_THE_TIGER_RIDER);
                vehSummoner->RemoveAurasDueToSpell(SPELL_SUMMON_ZENTABRA_TRIGGER);
            }

            me->DespawnOrUnsummon();
        }
    }

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

        if (!_tigerGuid)
            return;

        _events.Update(diff);

        while (uint32 eventId = _events.ExecuteEvent())
        {
            switch (eventId)
            {
                case EVENT_POUNCE:
                    DoCastVictim(SPELL_POUNCE);
                    _events.ScheduleEvent(EVENT_POUNCE, 30s);
                    break;
                case EVENT_NOSUMMON: // Reapply SPELL_NO_SUMMON_AURA
                    if (Unit* tiger = ObjectAccessor::GetUnit(*me, _tigerGuid))
                    {
                        if (tiger->IsSummon())
                            if (Unit* vehSummoner = tiger->ToTempSummon()->GetSummonerUnit())
                                me->AddAura(SPELL_NO_SUMMON_AURA, vehSummoner);
                    }
                    _events.ScheduleEvent(EVENT_NOSUMMON, 50s);
                    break;
                default:
                    break;
            }
        }
    }

private:
    EventMap _events;
    ObjectGuid _tigerGuid;
};

// These models was found in sniff.
/// @todo generalize these models with race from dbc
uint32 const trollmodel[] =
{11665, 11734, 11750, 12037, 12038, 12042, 12049, 12849, 13529, 14759, 15570, 15701,
15702, 1882, 1897, 1976, 2025, 27286, 2734, 2735, 4084, 4085, 4087, 4089, 4231, 4357,
4358, 4360, 4361, 4362, 4363, 4370, 4532, 4537, 4540, 4610, 6839, 7037, 9767, 9768};

struct npc_troll_volunteer : public ScriptedAI
{
    npc_troll_volunteer(Creature* creature) : ScriptedAI(creature)
    {
        Initialize();
        _mountModel = 0;
    }

    void Initialize()
    {
        _complete = false;
    }

    void InitializeAI() override
    {
        if (me->isDead() || !me->GetOwner())
            return;

        Reset();

        switch (urand(0, 3))
        {
            case 0:
                _mountModel = 6471;
                break;
            case 1:
                _mountModel = 6473;
                break;
            case 2:
                _mountModel = 6469;
                break;
            default:
                _mountModel = 6472;
                break;
        }
        me->SetDisplayId(trollmodel[urand(0, 39)]);
        if (Player* player = me->GetOwner()->ToPlayer())
            me->GetMotionMaster()->MoveFollow(player, 5.0f, (rand_norm() + 1.0f) * float(M_PI) / 3.0f * 4.0f);
    }

    void Reset() override
    {
        Initialize();
        me->AddAura(SPELL_VOLUNTEER_AURA, me);
        me->AddAura(SPELL_MOUNTING_CHECK, me);
        DoCast(me, SPELL_PETACT_AURA);
        me->SetReactState(REACT_PASSIVE);
        Talk(SAY_VOLUNTEER_START);
    }

    // This is needed for mount check aura to know what mountmodel the npc got stored
    uint32 GetMountId()
    {
        return _mountModel;
    }

    void MovementInform(uint32 type, uint32 id) override
    {
        if (type != POINT_MOTION_TYPE)
            return;
        if (id == POINT_URUZIN)
            me->DespawnOrUnsummon();
    }

    void SpellHit(WorldObject* caster, SpellInfo const* spellInfo) override
    {
        if (spellInfo->Id == SPELL_AOE_TURNIN && caster->GetEntry() == NPC_URUZIN && !_complete)
        {
            _complete = true;    // Preventing from giving credit twice
            DoCast(me, SPELL_TURNIN);
            DoCast(me, SPELL_QUEST_CREDIT);
            me->RemoveAurasDueToSpell(SPELL_MOUNTING_CHECK);
            me->Dismount();
            Talk(SAY_VOLUNTEER_END);
            me->GetMotionMaster()->MovePoint(POINT_URUZIN, caster->GetPositionX(), caster->GetPositionY(), caster->GetPositionZ());
        }
    }

private:
    uint32 _mountModel;
    bool _complete;
};

typedef npc_troll_volunteer VolunteerAI;

// 75420 - Mounting Check
class spell_mount_check : public AuraScript
{
    bool Validate(SpellInfo const* /*spellInfo*/) override
    {
        return ValidateSpellInfo({ SPELL_MOUNTING_CHECK });
    }

    void HandleEffectPeriodic(AuraEffect const* /*aurEff*/)
    {
        Unit* target = GetTarget();
        Unit* owner = target->GetOwner();

        if (!owner)
            return;

        if (owner->IsMounted() && !target->IsMounted())
        {
            if (VolunteerAI* volunteerAI = CAST_AI(VolunteerAI, target->GetAI()))
                target->Mount(volunteerAI->GetMountId());
        }
        else if (!owner->IsMounted() && target->IsMounted())
            target->Dismount();

        target->SetSpeedRate(MOVE_RUN, owner->GetSpeedRate(MOVE_RUN));
        target->SetSpeedRate(MOVE_WALK, owner->GetSpeedRate(MOVE_WALK));
    }

    void Register() override
    {
        OnEffectPeriodic += AuraEffectPeriodicFn(spell_mount_check::HandleEffectPeriodic, EFFECT_0, SPELL_AURA_PERIODIC_DUMMY);
    }
};

// 75102 - Vol'jin's War Drums
class spell_voljin_war_drums : public SpellScript
{
    bool Validate(SpellInfo const* /*spellInfo*/) override
    {
        return ValidateSpellInfo({ SPELL_MOTIVATE_1, SPELL_MOTIVATE_2 });
    }

    void HandleDummy(SpellEffIndex /*effIndex*/)
    {
        Unit* caster = GetCaster();
        if (Unit* target = GetHitUnit())
        {
            uint32 motivate = 0;
            if (target->GetEntry() == NPC_CITIZEN_1)
                motivate = SPELL_MOTIVATE_1;
            else if (target->GetEntry() == NPC_CITIZEN_2)
                motivate = SPELL_MOTIVATE_2;
            if (motivate)
                caster->CastSpell(target, motivate, false);
        }
    }

    void Register() override
    {
        OnEffectHitTarget += SpellEffectFn(spell_voljin_war_drums::HandleDummy, EFFECT_0, SPELL_EFFECT_DUMMY);
    }
};

void AddSC_event_zalazane_fall()
{
    RegisterCreatureAI(npc_tiger_matriarch_credit);
    RegisterCreatureAI(npc_tiger_matriarch);
    RegisterCreatureAI(npc_troll_volunteer);
    RegisterSpellScript(spell_mount_check);
    RegisterSpellScript(spell_voljin_war_drums);
}