/**
 * MaNGOS is a full featured server for World of Warcraft, supporting
 * the following clients: 1.12.x, 2.4.3, 3.3.5a, 4.3.4a and 5.4.8
 *
 * Copyright (C) 2005-2020 MaNGOS <https://getmangos.eu>
 *
 * 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * World of Warcraft, and all World of Warcraft or Warcraft art, images,
 * and lore are copyrighted by Blizzard Entertainment, Inc.
 */

#ifndef MANGOS_H_OBJECT
#define MANGOS_H_OBJECT

#include "Common.h"
#include "ByteBuffer.h"
#include "UpdateFields.h"
#include "UpdateData.h"
#include "ObjectGuid.h"
#include "Camera.h"

#include <set>

#define CONTACT_DISTANCE            0.5f
#define INTERACTION_DISTANCE        5.0f
#define ATTACK_DISTANCE             5.0f
#define TRADE_DISTANCE              11.11f                  // max distance for trading
#define MAX_VISIBILITY_DISTANCE     333.0f                  // max distance for visible object show, limited in 333 yards
#define DEFAULT_VISIBILITY_DISTANCE 90.0f                   // default visible distance, 90 yards on continents
#define DEFAULT_VISIBILITY_INSTANCE 120.0f                  // default visible distance in instances, 120 yards
#define DEFAULT_VISIBILITY_BGARENAS 180.0f                  // default visible distance in BG/Arenas, 180 yards

#define DEFAULT_WORLD_OBJECT_SIZE   0.388999998569489f      // currently used (correctly?) for any non Unit world objects. This is actually the bounding_radius, like player/creature from creature_model_data
#define DEFAULT_OBJECT_SCALE        1.0f                    // non-Tauren player/item scale as default, npc/go from database, pets from dbc
#define DEFAULT_TAUREN_MALE_SCALE   1.35f                   // Tauren male player scale by default
#define DEFAULT_TAUREN_FEMALE_SCALE 1.25f                   // Tauren female player scale by default

#define MAX_STEALTH_DETECT_RANGE    45.0f

enum TempSpawnType
{
    TEMPSPAWN_MANUAL_DESPAWN               = 0,             // despawns when UnSummon() is called
    TEMPSPAWN_DEAD_DESPAWN                 = 1,             // despawns when the creature disappears
    TEMPSPAWN_CORPSE_DESPAWN               = 2,             // despawns instantly after death
    TEMPSPAWN_CORPSE_TIMED_DESPAWN         = 3,             // despawns after a specified time after death (or when the creature disappears)
    TEMPSPAWN_TIMED_DESPAWN                = 4,             // despawns after a specified time
    TEMPSPAWN_TIMED_OOC_DESPAWN            = 5,             // despawns after a specified time after the creature is out of combat
    TEMPSPAWN_TIMED_OR_DEAD_DESPAWN        = 6,             // despawns after a specified time OR when the creature disappears
    TEMPSPAWN_TIMED_OR_CORPSE_DESPAWN      = 7,             // despawns after a specified time OR when the creature dies
    TEMPSPAWN_TIMED_OOC_OR_DEAD_DESPAWN    = 8,             // despawns after a specified time (OOC) OR when the creature disappears
    TEMPSPAWN_TIMED_OOC_OR_CORPSE_DESPAWN  = 9,             // despawns after a specified time (OOC) OR when the creature dies
};

class WorldPacket;
class UpdateData;
class WorldSession;
class Creature;
class GameObject;
class Player;
class Unit;
class Group;
class Map;
class UpdateMask;
class InstanceData;
class TerrainInfo;
#ifdef ENABLE_ELUNA
class ElunaEventProcessor;
#endif /* ENABLE_ELUNA */
struct MangosStringLocale;

typedef UNORDERED_MAP<Player*, UpdateData> UpdateDataMapType;

struct Position
{
    Position() : x(0.0f), y(0.0f), z(0.0f), o(0.0f) {}
    float x, y, z, o;
};

struct WorldLocation
{
    uint32 mapid;
    float coord_x;
    float coord_y;
    float coord_z;
    float orientation;
    explicit WorldLocation(uint32 _mapid = 0, float _x = 0, float _y = 0, float _z = 0, float _o = 0)
        : mapid(_mapid), coord_x(_x), coord_y(_y), coord_z(_z), orientation(_o) {}
    WorldLocation(WorldLocation const& loc)
        : mapid(loc.mapid), coord_x(loc.coord_x), coord_y(loc.coord_y), coord_z(loc.coord_z), orientation(loc.orientation) {}
};


// use this class to measure time between world update ticks
// essential for units updating their spells after cells become active
class WorldUpdateCounter
{
    public:
        WorldUpdateCounter() : m_tmStart(0) {}

        time_t timeElapsed()
        {
            if (!m_tmStart)
            {
                m_tmStart = WorldTimer::tickPrevTime();
            }

            return WorldTimer::getMSTimeDiff(m_tmStart, WorldTimer::tickTime());
        }

        void Reset() { m_tmStart = WorldTimer::tickTime(); }

    private:
        uint32 m_tmStart;
};

class Object
{
    public:
        virtual ~Object();

        const bool& IsInWorld() const { return m_inWorld; }
        virtual void AddToWorld()
        {
            if (m_inWorld)
            {
                return;
            }

            m_inWorld = true;

            // synchronize values mirror with values array (changes will send in updatecreate opcode any way
            ClearUpdateMask(false);                         // false - we can't have update data in update queue before adding to world
        }
        virtual void RemoveFromWorld()
        {
            // if we remove from world then sending changes not required
            ClearUpdateMask(true);
            m_inWorld = false;
        }

        ObjectGuid const& GetObjectGuid() const { return GetGuidValue(OBJECT_FIELD_GUID); }
        uint32 GetGUIDLow() const { return GetObjectGuid().GetCounter(); }
        PackedGuid const& GetPackGUID() const { return m_PackGUID; }
        std::string GetGuidStr() const { return GetObjectGuid().GetString(); }

        uint32 GetEntry() const { return GetUInt32Value(OBJECT_FIELD_ENTRY); }
        void SetEntry(uint32 entry) { SetUInt32Value(OBJECT_FIELD_ENTRY, entry); }

        float GetObjectScale() const
        {
            return m_floatValues[OBJECT_FIELD_SCALE_X] ? m_floatValues[OBJECT_FIELD_SCALE_X] : DEFAULT_OBJECT_SCALE;
        }

        void SetObjectScale(float newScale);

        uint8 GetTypeId() const { return m_objectTypeId; }
        bool isType(TypeMask mask) const { return (mask & m_objectType); }

        virtual void BuildCreateUpdateBlockForPlayer(UpdateData* data, Player* target) const;
        void SendCreateUpdateToPlayer(Player* player);

        // must be overwrite in appropriate subclasses (WorldObject, Item currently), or will crash
        virtual void AddToClientUpdateList();
        virtual void RemoveFromClientUpdateList();
        virtual void BuildUpdateData(UpdateDataMapType& update_players);
        void MarkForClientUpdate();
        void SendForcedObjectUpdate();

        void BuildValuesUpdateBlockForPlayer(UpdateData* data, Player* target) const;
        void BuildOutOfRangeUpdateBlock(UpdateData* data) const;

        virtual void DestroyForPlayer(Player* target) const;

        const int32& GetInt32Value(uint16 index) const
        {
            MANGOS_ASSERT(index < m_valuesCount || PrintIndexError(index , false));
            return m_int32Values[ index ];
        }

        const uint32& GetUInt32Value(uint16 index) const
        {
            MANGOS_ASSERT(index < m_valuesCount || PrintIndexError(index , false));
            return m_uint32Values[ index ];
        }

        const uint64& GetUInt64Value(uint16 index) const
        {
            MANGOS_ASSERT(index + 1 < m_valuesCount || PrintIndexError(index , false));
            return *((uint64*) & (m_uint32Values[ index ]));
        }

        const float& GetFloatValue(uint16 index) const
        {
            MANGOS_ASSERT(index < m_valuesCount || PrintIndexError(index , false));
            return m_floatValues[ index ];
        }

        uint8 GetByteValue(uint16 index, uint8 offset) const
        {
            MANGOS_ASSERT(index < m_valuesCount || PrintIndexError(index , false));
            MANGOS_ASSERT(offset < 4);
            return *(((uint8*)&m_uint32Values[ index ]) + offset);
        }

        uint16 GetUInt16Value(uint16 index, uint8 offset) const
        {
            MANGOS_ASSERT(index < m_valuesCount || PrintIndexError(index , false));
            MANGOS_ASSERT(offset < 2);
            return *(((uint16*)&m_uint32Values[ index ]) + offset);
        }

        ObjectGuid const& GetGuidValue(uint16 index) const { return *reinterpret_cast<ObjectGuid const*>(&GetUInt64Value(index)); }

        Player* ToPlayer() { if (GetTypeId() == TYPEID_PLAYER) return reinterpret_cast<Player*>(this); else return NULL; }
        Player const* ToPlayer() const { if (GetTypeId() == TYPEID_PLAYER) return reinterpret_cast<Player const*>(this); else return NULL; }

        Creature* ToCreature() { if (GetTypeId() == TYPEID_UNIT) return reinterpret_cast<Creature*>(this); else return NULL; }
        Creature const* ToCreature() const { if (GetTypeId() == TYPEID_UNIT) return reinterpret_cast<Creature const*>(this); else return NULL; }

        Unit* ToUnit() { if (isType(TYPEMASK_UNIT)) return reinterpret_cast<Unit*>(this); else return NULL; }
        Unit const* ToUnit() const { if (isType(TYPEMASK_UNIT)) return reinterpret_cast<Unit const*>(this); else return NULL; }

        GameObject* ToGameObject() { if (GetTypeId() == TYPEID_GAMEOBJECT) return reinterpret_cast<GameObject*>(this); else return NULL; }
        GameObject const* ToGameObject() const { if (GetTypeId() == TYPEID_GAMEOBJECT) return reinterpret_cast<GameObject const*>(this); else return NULL; }

        Corpse* ToCorpse() { if (GetTypeId() == TYPEID_CORPSE) return reinterpret_cast<Corpse*>(this); else return NULL; }
        Corpse const* ToCorpse() const { if (GetTypeId() == TYPEID_CORPSE) return reinterpret_cast<Corpse const*>(this); else return NULL; }

        DynamicObject* ToDynObject() { if (GetTypeId() == TYPEID_DYNAMICOBJECT) return reinterpret_cast<DynamicObject*>(this); else return NULL; }
        DynamicObject const* ToDynObject() const { if (GetTypeId() == TYPEID_DYNAMICOBJECT) return reinterpret_cast<DynamicObject const*>(this); else return NULL; }

        void SetInt32Value(uint16 index,        int32  value);
        void SetUInt32Value(uint16 index,       uint32  value);
        void UpdateUInt32Value(uint16 index,    uint32  value);
        void SetUInt64Value(uint16 index, const uint64& value);
        void SetFloatValue(uint16 index,       float   value);
        void SetByteValue(uint16 index, uint8 offset, uint8 value);
        void SetUInt16Value(uint16 index, uint8 offset, uint16 value);
        void SetInt16Value(uint16 index, uint8 offset, int16 value) { SetUInt16Value(index, offset, (uint16)value); }
        void SetGuidValue(uint16 index, ObjectGuid const& value) { SetUInt64Value(index, value.GetRawValue()); }
        void SetStatFloatValue(uint16 index, float value);
        void SetStatInt32Value(uint16 index, int32 value);
        void ForceValuesUpdateAtIndex(uint16 index);
        void ApplyModUInt32Value(uint16 index, int32 val, bool apply);
        void ApplyModInt32Value(uint16 index, int32 val, bool apply);
        void ApplyModPositiveFloatValue(uint16 index, float val, bool apply);
        void ApplyModSignedFloatValue(uint16 index, float val, bool apply);

        void ApplyPercentModFloatValue(uint16 index, float val, bool apply)
        {
            val = val != -100.0f ? val : -99.9f ;
            SetFloatValue(index, GetFloatValue(index) * (apply ? (100.0f + val) / 100.0f : 100.0f / (100.0f + val)));
        }

        /**
        * method to force the update of a given flag to the client. The method is checking the index before indicating the flags need an update.
        *
        * \param index uint16 of the flag to be updated.
        */
        void MarkFlagUpdateForClient(uint16 index);
        void SetFlag(uint16 index, uint32 newFlag);
        void RemoveFlag(uint16 index, uint32 oldFlag);

        void ToggleFlag(uint16 index, uint32 flag)
        {
            if (HasFlag(index, flag))
            {
                RemoveFlag(index, flag);
            }
            else
            {
                SetFlag(index, flag);
            }
        }

        /**
         * Checks if a certain flag is set.
         * @param index The index to check, values may originate from at least \ref EUnitFields
         * @param flag Which flag to check, value may originate from a lot of places, see code
         * for examples of what
         * @return true if the flag is set, false otherwise
         * \todo More info on these flags and where they come from, also, which indexes can be used?
         */
        bool HasFlag(uint16 index, uint32 flag) const
        {
            MANGOS_ASSERT(index < m_valuesCount || PrintIndexError(index , false));
            return (m_uint32Values[ index ] & flag) != 0;
        }

        void ApplyModFlag(uint16 index, uint32 flag, bool apply)
        {
            if (apply)
            {
                SetFlag(index, flag);
            }
            else
            {
                RemoveFlag(index, flag);
            }
        }

        void SetByteFlag(uint16 index, uint8 offset, uint8 newFlag);
        void RemoveByteFlag(uint16 index, uint8 offset, uint8 newFlag);

        void ToggleByteFlag(uint16 index, uint8 offset, uint8 flag)
        {
            if (HasByteFlag(index, offset, flag))
            {
                RemoveByteFlag(index, offset, flag);
            }
            else
            {
                SetByteFlag(index, offset, flag);
            }
        }

        bool HasByteFlag(uint16 index, uint8 offset, uint8 flag) const
        {
            MANGOS_ASSERT(index < m_valuesCount || PrintIndexError(index , false));
            MANGOS_ASSERT(offset < 4);
            return (((uint8*)&m_uint32Values[index])[offset] & flag) != 0;
        }

        void ApplyModByteFlag(uint16 index, uint8 offset, uint32 flag, bool apply)
        {
            if (apply)
            {
                SetByteFlag(index, offset, flag);
            }
            else
            {
                RemoveByteFlag(index, offset, flag);
            }
        }

        void SetShortFlag(uint16 index, bool highpart, uint16 newFlag);
        void RemoveShortFlag(uint16 index, bool highpart, uint16 oldFlag);

        void ToggleShortFlag(uint16 index, bool highpart, uint8 flag)
        {
            if (HasShortFlag(index, highpart, flag))
            {
                RemoveShortFlag(index, highpart, flag);
            }
            else
            {
                SetShortFlag(index, highpart, flag);
            }
        }

        bool HasShortFlag(uint16 index, bool highpart, uint8 flag) const
        {
            MANGOS_ASSERT(index < m_valuesCount || PrintIndexError(index , false));
            return (((uint16*)&m_uint32Values[index])[highpart ? 1 : 0] & flag) != 0;
        }

        void ApplyModShortFlag(uint16 index, bool highpart, uint32 flag, bool apply)
        {
            if (apply)
            {
                SetShortFlag(index, highpart, flag);
            }
            else
            {
                RemoveShortFlag(index, highpart, flag);
            }
        }

        void SetFlag64(uint16 index, uint64 newFlag)
        {
            uint64 oldval = GetUInt64Value(index);
            uint64 newval = oldval | newFlag;
            SetUInt64Value(index, newval);
        }

        void RemoveFlag64(uint16 index, uint64 oldFlag)
        {
            uint64 oldval = GetUInt64Value(index);
            uint64 newval = oldval & ~oldFlag;
            SetUInt64Value(index, newval);
        }

        void ToggleFlag64(uint16 index, uint64 flag)
        {
            if (HasFlag64(index, flag))
            {
                RemoveFlag64(index, flag);
            }
            else
            {
                SetFlag64(index, flag);
            }
        }

        bool HasFlag64(uint16 index, uint64 flag) const
        {
            MANGOS_ASSERT(index < m_valuesCount || PrintIndexError(index , false));
            return (GetUInt64Value(index) & flag) != 0;
        }

        void ApplyModFlag64(uint16 index, uint64 flag, bool apply)
        {
            if (apply)
            {
                SetFlag64(index, flag);
            }
            else
            {
                RemoveFlag64(index, flag);
            }
        }

        void ClearUpdateMask(bool remove);

        bool LoadValues(const char* data);

        uint16 GetValuesCount() const { return m_valuesCount; }

        virtual bool HasQuest(uint32 /* quest_id */) const { return false; }
        virtual bool HasInvolvedQuest(uint32 /* quest_id */) const { return false; }
        void _ReCreate(uint32 entry);
        void SetAsNewObject(bool isNew) { m_isNewObject = isNew; }

    protected:
        Object();

        void _InitValues();
        void _Create(uint32 guidlow, uint32 entry, HighGuid guidhigh);

        virtual void _SetUpdateBits(UpdateMask* updateMask, Player* target) const;

        virtual void _SetCreateBits(UpdateMask* updateMask, Player* target) const;

        void BuildMovementUpdate(ByteBuffer* data, uint8 updateFlags) const;
        void BuildValuesUpdate(uint8 updatetype, ByteBuffer* data, UpdateMask* updateMask, Player* target) const;
        void BuildUpdateDataForPlayer(Player* pl, UpdateDataMapType& update_players);

        uint16 m_objectType;

        uint8 m_objectTypeId;
        uint8 m_updateFlag;

        union
        {
            int32*  m_int32Values;
            uint32* m_uint32Values;
            float*  m_floatValues;
        };

        std::vector<bool> m_changedValues;
        std::map<uint32, uint32> m_plrSpecificFlags;

        uint16 m_valuesCount;

        bool m_objectUpdated;

    private:
        bool m_inWorld;
        bool m_isNewObject;

        PackedGuid m_PackGUID;

        Object(const Object&);                              // prevent generation copy constructor
        Object& operator=(Object const&);                   // prevent generation assigment operator

    public:
        // for output helpfull error messages from ASSERTs
        bool PrintIndexError(uint32 index, bool set) const;
        bool PrintEntryError(char const* descr) const;
};

struct WorldObjectChangeAccumulator;

class WorldObject : public Object
{
        friend struct WorldObjectChangeAccumulator;

    public:

        // class is used to manipulate with WorldUpdateCounter
        // it is needed in order to get time diff between two object's Update() calls
        class UpdateHelper
        {
            public:
                explicit UpdateHelper(WorldObject* obj) : m_obj(obj) {}
                ~UpdateHelper() { }

                void Update(uint32 time_diff)
                {
                    m_obj->Update(m_obj->m_updateTracker.timeElapsed(), time_diff);
                    m_obj->m_updateTracker.Reset();
                }

            private:
                UpdateHelper(const UpdateHelper&);
                UpdateHelper& operator=(const UpdateHelper&);

                WorldObject* const m_obj;
        };

        virtual ~WorldObject();

        virtual void Update(uint32 update_diff, uint32 /*time_diff*/);

        void _Create(uint32 guidlow, HighGuid guidhigh);

        void Relocate(float x, float y, float z, float orientation);
        void Relocate(float x, float y, float z);

        void SetOrientation(float orientation);

        float GetPositionX() const { return m_position.x; }
        float GetPositionY() const { return m_position.y; }
        float GetPositionZ() const { return m_position.z; }
        void GetPosition(float& x, float& y, float& z) const
        {
            x = m_position.x; y = m_position.y; z = m_position.z;
        }
        void GetPosition(WorldLocation& loc) const
        {
            loc.mapid = m_mapId; GetPosition(loc.coord_x, loc.coord_y, loc.coord_z); loc.orientation = GetOrientation();
        }
        float GetOrientation() const { return m_position.o; }

        /// Gives a 2d-point in distance distance2d in direction absAngle around the current position (point-to-point)
        void GetNearPoint2D(float& x, float& y, float distance2d, float absAngle) const;
        /** Gives a "free" spot for searcher in distance distance2d in direction absAngle on "good" height
         * @param searcher          -           for whom a spot is searched for
         * @param x, y, z           -           position for the found spot of the searcher
         * @param searcher_bounding_radius  -   how much space the searcher will require
         * @param distance2d        -           distance between the middle-points
         * @param absAngle          -           angle in which the spot is preferred
         */
        void GetNearPoint(WorldObject const* searcher, float& x, float& y, float& z, float searcher_bounding_radius, float distance2d, float absAngle) const;
        /** Gives a "free" spot for a searcher on the distance (including bounding-radius calculation)
         * @param x, y, z           -           position for the found spot
         * @param bounding_radius   -           radius for the searcher
         * @param distance2d        -           range in which to find a free spot. Default = 0.0f (which usually means the units will have contact)
         * @param angle             -           direction in which to look for a free spot. Default = 0.0f (direction in which 'this' is looking
         * @param obj               -           for whom to look for a spot. Default = NULL
         */
        void GetClosePoint(float& x, float& y, float& z, float bounding_radius, float distance2d = 0.0f, float angle = 0.0f, const WorldObject* obj = NULL) const
        {
            // angle calculated from current orientation
            GetNearPoint(obj, x, y, z, bounding_radius, distance2d, GetOrientation() + angle);
        }
        /** Gives a "free" spot for a searcher in contact-range of "this" (including bounding-radius calculation)
         * @param x, y, z           -           position for the found spot
         * @param obj               -           for whom to find a contact position. The position will be searched in direction from 'this' towards 'obj'
         * @param distance2d        -           distance which 'obj' and 'this' should have beetween their bounding radiuses. Default = CONTACT_DISTANCE
         */
        void GetContactPoint(const WorldObject* obj, float& x, float& y, float& z, float distance2d = CONTACT_DISTANCE) const
        {
            // angle to face `obj` to `this` using distance includes size of `obj`
            GetNearPoint(obj, x, y, z, obj->GetObjectBoundingRadius(), distance2d, GetAngle(obj));
        }

        virtual float GetObjectBoundingRadius() const { return DEFAULT_WORLD_OBJECT_SIZE; }

        bool IsPositionValid() const;
        void UpdateGroundPositionZ(float x, float y, float& z) const;
        void UpdateAllowedPositionZ(float x, float y, float& z, Map* atMap = NULL) const;

        void GetRandomPoint(float x, float y, float z, float distance, float& rand_x, float& rand_y, float& rand_z, float minDist = 0.0f, float const* ori = NULL) const;

        uint32 GetMapId() const { return m_mapId; }
        uint32 GetInstanceId() const { return m_InstanceId; }

        uint32 GetZoneId() const;
        uint32 GetAreaId() const;
        void GetZoneAndAreaId(uint32& zoneid, uint32& areaid) const;

        InstanceData* GetInstanceData() const;

        const char* GetName() const { return m_name.c_str(); }
        void SetName(const std::string& newname) { m_name = newname; }

        virtual const char* GetNameForLocaleIdx(int32 /*locale_idx*/) const { return GetName(); }

        float GetDistance(const WorldObject* obj) const;
        float GetDistance(float x, float y, float z) const;
        float GetDistance2d(const WorldObject* obj) const;
        float GetDistance2d(float x, float y) const;
        float GetDistanceZ(const WorldObject* obj) const;
        bool IsInMap(const WorldObject* obj) const
        {
            return IsInWorld() && obj->IsInWorld() && (GetMap() == obj->GetMap());
        }
        bool IsWithinDist3d(float x, float y, float z, float dist2compare) const;
        bool IsWithinDist2d(float x, float y, float dist2compare) const;
        bool _IsWithinDist(WorldObject const* obj, float dist2compare, bool is3D) const;

        // use only if you will sure about placing both object at same map
        bool IsWithinDist(WorldObject const* obj, float dist2compare, bool is3D = true) const
        {
            return obj && _IsWithinDist(obj, dist2compare, is3D);
        }

        bool IsWithinDistInMap(WorldObject const* obj, float dist2compare, bool is3D = true) const
        {
            return obj && IsInMap(obj) && _IsWithinDist(obj, dist2compare, is3D);
        }
        bool IsWithinLOS(float x, float y, float z) const;
        bool IsWithinLOSInMap(const WorldObject* obj) const;
        bool GetDistanceOrder(WorldObject const* obj1, WorldObject const* obj2, bool is3D = true) const;
        bool IsInRange(WorldObject const* obj, float minRange, float maxRange, bool is3D = true) const;
        bool IsInRange2d(float x, float y, float minRange, float maxRange) const;
        bool IsInRange3d(float x, float y, float z, float minRange, float maxRange) const;

        float GetAngle(const WorldObject* obj) const;
        float GetAngle(const float x, const float y) const;
        bool HasInArc(const float arcangle, const WorldObject* obj) const;
        bool IsInFrontInMap(WorldObject const* target, float distance, float arc = M_PI) const;
        bool IsInBackInMap(WorldObject const* target, float distance, float arc = M_PI) const;
        bool IsInFront(WorldObject const* target, float distance, float arc = M_PI) const;
        bool IsInBack(WorldObject const* target, float distance, float arc = M_PI) const;

        virtual void CleanupsBeforeDelete();                // used in destructor or explicitly before mass creature delete to remove cross-references to already deleted units

        virtual void SendMessageToSet(WorldPacket* data, bool self) const;
        virtual void SendMessageToSetInRange(WorldPacket* data, float dist, bool self) const;
        void SendMessageToSetExcept(WorldPacket* data, Player const* skipped_receiver) const;

        void MonsterSay(const char* text, uint32 language, Unit const* target = NULL) const;
        void MonsterYell(const char* text, uint32 language, Unit const* target = NULL) const;
        void MonsterTextEmote(const char* text, Unit const* target, bool IsBossEmote = false) const;
        void MonsterWhisper(const char* text, Unit const* target, bool IsBossWhisper = false) const;
        void MonsterText(MangosStringLocale const* textData, Unit const* target) const;

        void PlayDistanceSound(uint32 sound_id, Player const* target = NULL) const;
        void PlayDirectSound(uint32 sound_id, Player const* target = NULL) const;
        void PlayMusic(uint32 sound_id, Player const* target = NULL) const;

        void SendObjectDeSpawnAnim(ObjectGuid guid);

        virtual bool IsHostileTo(Unit const* unit) const = 0;
        virtual bool IsFriendlyTo(Unit const* unit) const = 0;
        virtual bool IsControlledByPlayer() const { return false; }

        virtual void SaveRespawnTime() {}
        void AddObjectToRemoveList();

        void UpdateObjectVisibility();
        virtual void UpdateVisibilityAndView();             // update visibility for object and object for all around

        // main visibility check function in normal case (ignore grey zone distance check)
        bool IsVisibleFor(Player const* u, WorldObject const* viewPoint) const { return IsVisibleForInState(u, viewPoint, false); }

        // low level function for visibility change code, must be define in all main world object subclasses
        virtual bool IsVisibleForInState(Player const* u, WorldObject const* viewPoint, bool inVisibleList) const = 0;

        void SetMap(Map* map);
        Map* GetMap() const { MANGOS_ASSERT(m_currMap); return m_currMap; }
        // used to check all object's GetMap() calls when object is not in world!
        void ResetMap();

        void AddToClientUpdateList() override;
        void RemoveFromClientUpdateList() override;
        void BuildUpdateData(UpdateDataMapType&) override;

        Creature* SummonCreature(uint32 id, float x, float y, float z, float ang, TempSpawnType spwtype, uint32 despwtime, bool asActiveObject = false, bool setRun = false);
        GameObject* SummonGameObject(uint32 id, float x, float y, float z, float angle, uint32 despwtime);

        bool IsActiveObject() const { return m_isActiveObject || m_viewPoint.hasViewers(); }
        bool isActiveObject() const { return IsActiveObject(); } // This is for Eluna to build. Should be removed in the future!

        void SetActiveObjectState(bool active);

        ViewPoint& GetViewPoint() { return m_viewPoint; }

        // ASSERT print helper
        bool PrintCoordinatesError(float x, float y, float z, char const* descr) const;

        virtual void StartGroupLoot(Group* /*group*/, uint32 /*timer*/) { }

#ifdef ENABLE_ELUNA
        ElunaEventProcessor* elunaEvents;
#endif /* ENABLE_ELUNA */

    protected:
        explicit WorldObject();

        // these functions are used mostly for Relocate() and Corpse/Player specific stuff...
        // use them ONLY in LoadFromDB()/Create() funcs and nowhere else!
        // mapId/instanceId should be set in SetMap() function!
        void SetLocationMapId(uint32 _mapId) { m_mapId = _mapId; }
        void SetLocationInstanceId(uint32 _instanceId) { m_InstanceId = _instanceId; }

        virtual void StopGroupLoot() {}

        std::string m_name;

    private:
        Map* m_currMap;                                     // current object's Map location

        uint32 m_mapId;                                     // object at map with map_id
        uint32 m_InstanceId;                                // in map copy with instance id

        Position m_position;
        ViewPoint m_viewPoint;
        WorldUpdateCounter m_updateTracker;
        bool m_isActiveObject;
};

#endif