/**
 * 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) 2005-2017  MaNGOS project <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.
 */

#include "Common.h"
#include "Log.h"
#include "WorldPacket.h"
#include "WorldSession.h"
#include "Opcodes.h"
#include "World.h"
#include "ObjectMgr.h"
#include "Player.h"
#include "GossipDef.h"
#include "QuestDef.h"
#include "ObjectAccessor.h"
#include "ScriptMgr.h"
#include "Group.h"
#ifdef ENABLE_ELUNA
#include "LuaEngine.h"
#endif /* ENABLE_ELUNA */

void WorldSession::HandleQuestgiverStatusQueryOpcode(WorldPacket& recv_data)
{
    ObjectGuid guid;
    recv_data >> guid;
    uint8 dialogStatus = DIALOG_STATUS_NONE;

    Object* questgiver = _player->GetObjectByTypeMask(guid, TYPEMASK_CREATURE_OR_GAMEOBJECT);
    if (!questgiver)
    {
        DETAIL_LOG("Error in CMSG_QUESTGIVER_STATUS_QUERY, called for not found questgiver %s", guid.GetString().c_str());
        return;
    }

    DEBUG_LOG("WORLD: Received opcode CMSG_QUESTGIVER_STATUS_QUERY - for %s to %s", _player->GetGuidStr().c_str(), guid.GetString().c_str());

    switch (questgiver->GetTypeId())
    {
        case TYPEID_UNIT:
        {
            Creature* cr_questgiver = (Creature*)questgiver;

            if (!cr_questgiver->IsHostileTo(_player))       // not show quest status to enemies
            {
                dialogStatus = sScriptMgr.GetDialogStatus(_player, cr_questgiver);

                if (dialogStatus == DIALOG_STATUS_UNDEFINED)
                    { dialogStatus = getDialogStatus(_player, cr_questgiver, DIALOG_STATUS_NONE); }
            }
            break;
        }
        case TYPEID_GAMEOBJECT:
        {
            GameObject* go_questgiver = (GameObject*)questgiver;
            dialogStatus = sScriptMgr.GetDialogStatus(_player, go_questgiver);

            if (dialogStatus == DIALOG_STATUS_UNDEFINED)
                { dialogStatus = getDialogStatus(_player, go_questgiver, DIALOG_STATUS_NONE); }

            break;
        }
        default:
            sLog.outError("QuestGiver called for unexpected type %u", questgiver->GetTypeId());
            break;
    }

    // inform client about status of quest
    _player->PlayerTalkClass->SendQuestGiverStatus(dialogStatus, guid);
}

void WorldSession::HandleQuestgiverHelloOpcode(WorldPacket& recv_data)
{
    ObjectGuid guid;
    recv_data >> guid;

    DEBUG_LOG("WORLD: Received opcode CMSG_QUESTGIVER_HELLO - for %s to %s", _player->GetGuidStr().c_str(), guid.GetString().c_str());

    Creature* pCreature = GetPlayer()->GetNPCIfCanInteractWith(guid, UNIT_NPC_FLAG_NONE);
    if (!pCreature)
    {
        DEBUG_LOG("WORLD: HandleQuestgiverHelloOpcode - for %s to %s not found or you can't interact with him.", _player->GetGuidStr().c_str(), guid.GetString().c_str());
        return;
    }

    // remove fake death
    if (GetPlayer()->hasUnitState(UNIT_STAT_DIED))
        { GetPlayer()->RemoveSpellsCausingAura(SPELL_AURA_FEIGN_DEATH); }

    // Stop the npc if moving
    pCreature->StopMoving();

    if (sScriptMgr.OnGossipHello(_player, pCreature))
        { return; }

    _player->PrepareGossipMenu(pCreature, pCreature->GetCreatureInfo()->GossipMenuId);
    _player->SendPreparedGossip(pCreature);
}

void WorldSession::HandleQuestgiverAcceptQuestOpcode(WorldPacket& recv_data)
{
    ObjectGuid guid;
    uint32 quest;
    recv_data >> guid >> quest;

    if (!CanInteractWithQuestGiver(guid, "CMSG_QUESTGIVER_ACCEPT_QUEST"))
        { return; }

    DEBUG_LOG("WORLD: Received opcode CMSG_QUESTGIVER_ACCEPT_QUEST - for %s to %s, quest = %u", _player->GetGuidStr().c_str(), guid.GetString().c_str(), quest);

    Object* pObject = _player->GetObjectByTypeMask(guid, TYPEMASK_CREATURE_GAMEOBJECT_PLAYER_OR_ITEM);

    // no or incorrect quest giver
    if (!pObject
        || (pObject->GetTypeId() != TYPEID_PLAYER && !pObject->HasQuest(quest))
        || (pObject->GetTypeId() == TYPEID_PLAYER && !((Player*)pObject)->CanShareQuest(quest))
       )
    {
        _player->PlayerTalkClass->CloseGossip();
        _player->ClearDividerGuid();
        return;
    }

    Quest const* qInfo = sObjectMgr.GetQuestTemplate(quest);
    if (qInfo)
    {
        // prevent cheating
        if (!GetPlayer()->CanTakeQuest(qInfo, true))
        {
            _player->PlayerTalkClass->CloseGossip();
            _player->ClearDividerGuid();
            return;
        }

        if (Player* pPlayer = ObjectAccessor::FindPlayer(_player->GetDividerGuid()))
        {
            pPlayer->SendPushToPartyResponse(_player, QUEST_PARTY_MSG_ACCEPT_QUEST);
            _player->ClearDividerGuid();
        }

        if (_player->CanAddQuest(qInfo, true))
        {
            _player->AddQuest(qInfo, pObject);              // pObject (if it item) can be destroyed at call

            if (qInfo->HasQuestFlag(QUEST_FLAGS_PARTY_ACCEPT))
            {
                if (Group* pGroup = _player->GetGroup())
                {
                    for (GroupReference* itr = pGroup->GetFirstMember(); itr != NULL; itr = itr->next())
                    {
                        Player* pPlayer = itr->getSource();

                        if (!pPlayer || pPlayer == _player) // not self
                            { continue; }

                        if (pPlayer->CanTakeQuest(qInfo, true))
                        {
                            pPlayer->SetDividerGuid(_player->GetObjectGuid());

                            // need confirmation that any gossip window will close
                            pPlayer->PlayerTalkClass->CloseGossip();

                            _player->SendQuestConfirmAccept(qInfo, pPlayer);
                        }
                    }
                }
            }

            if (_player->CanCompleteQuest(quest))
                { _player->CompleteQuest(quest); }

            _player->PlayerTalkClass->CloseGossip();

            if (qInfo->GetSrcSpell() > 0)
                { _player->CastSpell(_player, qInfo->GetSrcSpell(), true); }

            return;
        }
    }

    _player->PlayerTalkClass->CloseGossip();
}

void WorldSession::HandleQuestgiverQueryQuestOpcode(WorldPacket& recv_data)
{
    ObjectGuid guid;
    uint32 quest;
    recv_data >> guid >> quest;

    DEBUG_LOG("WORLD: Received opcode CMSG_QUESTGIVER_QUERY_QUEST - for %s to %s, quest = %u", _player->GetGuidStr().c_str(), guid.GetString().c_str(), quest);

    // Verify that the guid is valid and is a questgiver or involved in the requested quest
    Object* pObject = _player->GetObjectByTypeMask(guid, TYPEMASK_CREATURE_GAMEOBJECT_OR_ITEM);
    if (!pObject || (!pObject->HasQuest(quest) && !pObject->HasInvolvedQuest(quest)))
    {
        _player->PlayerTalkClass->CloseGossip();
        return;
    }

    if (Quest const* pQuest = sObjectMgr.GetQuestTemplate(quest))
        { _player->PlayerTalkClass->SendQuestGiverQuestDetails(pQuest, pObject->GetObjectGuid(), true); }
}

void WorldSession::HandleQuestQueryOpcode(WorldPacket& recv_data)
{
    uint32 quest;
    recv_data >> quest;
    DEBUG_LOG("WORLD: Received opcode CMSG_QUEST_QUERY quest = %u", quest);

    Quest const* pQuest = sObjectMgr.GetQuestTemplate(quest);
    if (pQuest)
    {
        _player->PlayerTalkClass->SendQuestQueryResponse(pQuest);
    }
}

void WorldSession::HandleQuestgiverChooseRewardOpcode(WorldPacket& recv_data)
{
    uint32 quest, reward;
    ObjectGuid guid;
    recv_data >> guid >> quest >> reward;

    if (reward >= QUEST_REWARD_CHOICES_COUNT)
    {
        sLog.outError("Error in CMSG_QUESTGIVER_CHOOSE_REWARD - %s tried to get invalid reward (%u) (probably packet hacking)", _player->GetGuidStr().c_str(), reward);
        return;
    }

    if (!CanInteractWithQuestGiver(guid, "CMSG_QUESTGIVER_CHOOSE_REWARD"))
        { return; }

    DEBUG_LOG("WORLD: Received opcode CMSG_QUESTGIVER_CHOOSE_REWARD - for %s to %s, quest = %u, reward = %u", _player->GetGuidStr().c_str(), guid.GetString().c_str(), quest, reward);

    Object* pObject = _player->GetObjectByTypeMask(guid, TYPEMASK_CREATURE_OR_GAMEOBJECT);
    if (!pObject)
        { return; }

    if (!pObject->HasInvolvedQuest(quest))
        { return; }

    Quest const* pQuest = sObjectMgr.GetQuestTemplate(quest);
    if (pQuest)
    {
        if (_player->CanRewardQuest(pQuest, reward, true))
        {
            _player->RewardQuest(pQuest, reward, pObject);

            // Send next quest
            if (Quest const* nextquest = _player->GetNextQuest(guid, pQuest))
                { _player->PlayerTalkClass->SendQuestGiverQuestDetails(nextquest, guid, true); }
        }
        else
            { _player->PlayerTalkClass->SendQuestGiverOfferReward(pQuest, guid, true); }
    }
}

void WorldSession::HandleQuestgiverRequestRewardOpcode(WorldPacket& recv_data)
{
    uint32 quest;
    ObjectGuid guid;
    recv_data >> guid >> quest;

    if (!CanInteractWithQuestGiver(guid, "CMSG_QUESTGIVER_REQUEST_REWARD"))
        { return; }

    DEBUG_LOG("WORLD: Received opcode CMSG_QUESTGIVER_REQUEST_REWARD - for %s to %s, quest = %u", _player->GetGuidStr().c_str(), guid.GetString().c_str(), quest);

    Object* pObject = _player->GetObjectByTypeMask(guid, TYPEMASK_CREATURE_OR_GAMEOBJECT);
    if (!pObject || !pObject->HasInvolvedQuest(quest))
        { return; }

    if (_player->CanCompleteQuest(quest))
        { _player->CompleteQuest(quest); }

    if (_player->GetQuestStatus(quest) != QUEST_STATUS_COMPLETE)
        { return; }

    if (Quest const* pQuest = sObjectMgr.GetQuestTemplate(quest))
        { _player->PlayerTalkClass->SendQuestGiverOfferReward(pQuest, guid, true); }
}

void WorldSession::HandleQuestgiverCancel(WorldPacket& /*recv_data*/)
{
    DEBUG_LOG("WORLD: Received opcode CMSG_QUESTGIVER_CANCEL");

    _player->PlayerTalkClass->CloseGossip();
}

void WorldSession::HandleQuestLogSwapQuest(WorldPacket& recv_data)
{
    uint8 slot1, slot2;
    recv_data >> slot1 >> slot2;

    if (slot1 == slot2 || slot1 >= MAX_QUEST_LOG_SIZE || slot2 >= MAX_QUEST_LOG_SIZE)
        { return; }

    DEBUG_LOG("WORLD: Received opcode CMSG_QUESTLOG_SWAP_QUEST slot 1 = %u, slot 2 = %u", slot1, slot2);

    GetPlayer()->SwapQuestSlot(slot1, slot2);
}

void WorldSession::HandleQuestLogRemoveQuest(WorldPacket& recv_data)
{
    uint8 slot;
    recv_data >> slot;

    DEBUG_LOG("WORLD: Received opcode CMSG_QUESTLOG_REMOVE_QUEST slot = %u", slot);

    if (slot < MAX_QUEST_LOG_SIZE)
    {
        if (uint32 quest = _player->GetQuestSlotQuestId(slot))
        {
            if (!_player->TakeQuestSourceItem(quest, true))
                { return; }                                     // can't un-equip some items, reject quest cancel

            if (const Quest* pQuest = sObjectMgr.GetQuestTemplate(quest))
            {
                if (pQuest->HasSpecialFlag(QUEST_SPECIAL_FLAG_TIMED))
                    { _player->RemoveTimedQuest(quest); }
            }

            _player->SetQuestStatus(quest, QUEST_STATUS_NONE);

            // Used by Eluna
#ifdef ENABLE_ELUNA
            sEluna->OnQuestAbandon(_player, quest);
#endif /* ENABLE_ELUNA */
        }

        _player->SetQuestSlot(slot, 0);
    }
}

void WorldSession::HandleQuestConfirmAccept(WorldPacket& recv_data)
{
    uint32 quest;
    recv_data >> quest;

    DEBUG_LOG("WORLD: Received opcode CMSG_QUEST_CONFIRM_ACCEPT quest = %u", quest);

    if (const Quest* pQuest = sObjectMgr.GetQuestTemplate(quest))
    {
        if (!pQuest->HasQuestFlag(QUEST_FLAGS_PARTY_ACCEPT))
            { return; }

        Player* pOriginalPlayer = ObjectAccessor::FindPlayer(_player->GetDividerGuid());

        if (!pOriginalPlayer)
            { return; }

        if (pQuest->IsAllowedInRaid())
        {
            if (!_player->IsInSameRaidWith(pOriginalPlayer))
                { return; }
        }
        else
        {
            if (!_player->IsInSameGroupWith(pOriginalPlayer))
                { return; }
        }

        if (_player->CanAddQuest(pQuest, true))
            { _player->AddQuest(pQuest, NULL); }                // NULL, this prevent DB script from duplicate running

        _player->ClearDividerGuid();
    }
}

void WorldSession::HandleQuestgiverCompleteQuest(WorldPacket& recv_data)
{
    uint32 quest;
    ObjectGuid guid;
    recv_data >> guid >> quest;

    if (!CanInteractWithQuestGiver(guid, "CMSG_QUESTGIVER_COMPLETE_QUEST"))
        { return; }

    // All ok, continue
    DEBUG_LOG("WORLD: Received opcode CMSG_QUESTGIVER_COMPLETE_QUEST - for %s to %s, quest = %u", _player->GetGuidStr().c_str(), guid.GetString().c_str(), quest);

    if (Quest const* pQuest = sObjectMgr.GetQuestTemplate(quest))
    {
        if (_player->GetQuestStatus(quest) != QUEST_STATUS_COMPLETE)
        {
            if (pQuest->IsRepeatable())
                { _player->PlayerTalkClass->SendQuestGiverRequestItems(pQuest, guid, _player->CanCompleteRepeatableQuest(pQuest), false); }
            else
                { _player->PlayerTalkClass->SendQuestGiverRequestItems(pQuest, guid, _player->CanRewardQuest(pQuest, false), false); }
        }
        else
            { _player->PlayerTalkClass->SendQuestGiverRequestItems(pQuest, guid, _player->CanRewardQuest(pQuest, false), false); }
    }
}

void WorldSession::HandleQuestgiverQuestAutoLaunch(WorldPacket& /*recvPacket*/)
{
    DEBUG_LOG("WORLD: Received opcode CMSG_QUESTGIVER_QUEST_AUTOLAUNCH");
}

void WorldSession::HandlePushQuestToParty(WorldPacket& recvPacket)
{
    uint32 questId;
    recvPacket >> questId;

    DEBUG_LOG("WORLD: Received opcode CMSG_PUSHQUESTTOPARTY quest = %u", questId);

    if (Quest const* pQuest = sObjectMgr.GetQuestTemplate(questId))
    {
        if (Group* pGroup = _player->GetGroup())
        {
            for (GroupReference* itr = pGroup->GetFirstMember(); itr != NULL; itr = itr->next())
            {
                Player* pPlayer = itr->getSource();

                if (!pPlayer || pPlayer == _player)         // skip self
                    { continue; }

                _player->SendPushToPartyResponse(pPlayer, QUEST_PARTY_MSG_SHARING_QUEST);

                if (_player->GetDistance(pPlayer) > 10)
                {
                    _player->SendPushToPartyResponse(pPlayer, QUEST_PARTY_MSG_TOO_FAR);
                    continue;
                }

                if (!pPlayer->SatisfyQuestStatus(pQuest, false))
                {
                    _player->SendPushToPartyResponse(pPlayer, QUEST_PARTY_MSG_HAVE_QUEST);
                    continue;
                }

                if (pPlayer->GetQuestStatus(questId) == QUEST_STATUS_COMPLETE)
                {
                    _player->SendPushToPartyResponse(pPlayer, QUEST_PARTY_MSG_FINISH_QUEST);
                    continue;
                }

                if (!pPlayer->CanTakeQuest(pQuest, false))
                {
                    _player->SendPushToPartyResponse(pPlayer, QUEST_PARTY_MSG_CANT_TAKE_QUEST);
                    continue;
                }

                if (!pPlayer->SatisfyQuestLog(false))
                {
                    _player->SendPushToPartyResponse(pPlayer, QUEST_PARTY_MSG_LOG_FULL);
                    continue;
                }

                if (pPlayer->GetDividerGuid())
                {
                    _player->SendPushToPartyResponse(pPlayer, QUEST_PARTY_MSG_BUSY);
                    continue;
                }

                pPlayer->PlayerTalkClass->SendQuestGiverQuestDetails(pQuest, _player->GetObjectGuid(), true);
                pPlayer->SetDividerGuid(_player->GetObjectGuid());
            }
        }
    }
}

void WorldSession::HandleQuestPushResult(WorldPacket& recvPacket)
{
    ObjectGuid guid;
    uint8 msg;
    recvPacket >> guid >> msg;

    DEBUG_LOG("WORLD: Received opcode MSG_QUEST_PUSH_RESULT");

    if (Player* pPlayer = ObjectAccessor::FindPlayer(_player->GetDividerGuid()))
    {
        WorldPacket data(MSG_QUEST_PUSH_RESULT, (8 + 1));
        data << ObjectGuid(guid);
        data << uint8(msg);               // enum QuestShareMessages
        pPlayer->GetSession()->SendPacket(&data);
        _player->ClearDividerGuid();
    }
}

/**
 * What - if any - kind of exclamation mark or question-mark should a quest-giver display for a player
 * @param pPlayer - for whom
 * @param questgiver - from whom
 * @param defstatus - initial set status (usually it will be called with DIALOG_STATUS_NONE) - must not be DIALOG_STATUS_UNDEFINED
 */
uint32 WorldSession::getDialogStatus(Player* pPlayer, Object* questgiver, uint32 defstatus)
{
    MANGOS_ASSERT(defstatus != DIALOG_STATUS_UNDEFINED);

    uint32 dialogStatus = defstatus;

    QuestRelationsMapBounds rbounds;                        // QuestRelations (quest-giver)
    QuestRelationsMapBounds irbounds;                       // InvolvedRelations (quest-finisher)

    switch (questgiver->GetTypeId())
    {
        case TYPEID_UNIT:
        {
            rbounds = sObjectMgr.GetCreatureQuestRelationsMapBounds(questgiver->GetEntry());
            irbounds = sObjectMgr.GetCreatureQuestInvolvedRelationsMapBounds(questgiver->GetEntry());
            break;
        }
        case TYPEID_GAMEOBJECT:
        {
            rbounds = sObjectMgr.GetGOQuestRelationsMapBounds(questgiver->GetEntry());
            irbounds = sObjectMgr.GetGOQuestInvolvedRelationsMapBounds(questgiver->GetEntry());
            break;
        }
        default:
            // it's impossible, but check ^)
            sLog.outError("Warning: GetDialogStatus called for unexpected type %u", questgiver->GetTypeId());
            return DIALOG_STATUS_NONE;
    }

    // Check markings for quest-finisher
    for (QuestRelationsMap::const_iterator itr = irbounds.first; itr != irbounds.second; ++itr)
    {
        uint32 dialogStatusNew = DIALOG_STATUS_NONE;
        uint32 quest_id = itr->second;
        Quest const* pQuest = sObjectMgr.GetQuestTemplate(quest_id);

        if (!pQuest || !pQuest->IsActive())
            { continue; }

        QuestStatus status = pPlayer->GetQuestStatus(quest_id);

        if ((status == QUEST_STATUS_COMPLETE && !pPlayer->GetQuestRewardStatus(quest_id)) ||
            (pQuest->IsAutoComplete() && pPlayer->CanTakeQuest(pQuest, false)))
        {
            if (pQuest->IsAutoComplete() && pQuest->IsRepeatable())
                { dialogStatusNew = DIALOG_STATUS_REWARD_REP; }
            else
                { dialogStatusNew = DIALOG_STATUS_REWARD2; }
        }
        else if (status == QUEST_STATUS_INCOMPLETE)
            { dialogStatusNew = DIALOG_STATUS_INCOMPLETE; }

        if (dialogStatusNew > dialogStatus)
            { dialogStatus = dialogStatusNew; }
    }

    // check markings for quest-giver
    for (QuestRelationsMap::const_iterator itr = rbounds.first; itr != rbounds.second; ++itr)
    {
        uint32 dialogStatusNew = DIALOG_STATUS_NONE;
        uint32 quest_id = itr->second;
        Quest const* pQuest = sObjectMgr.GetQuestTemplate(quest_id);

        if (!pQuest || !pQuest->IsActive())
            { continue; }

        QuestStatus status = pPlayer->GetQuestStatus(quest_id);

        if (status == QUEST_STATUS_NONE)                    // For all other cases the mark is handled either at some place else, or with involved-relations already
        {
            if (pPlayer->CanSeeStartQuest(pQuest))
            {
                if (pPlayer->SatisfyQuestLevel(pQuest, false))
                {
                    int32 lowLevelDiff = sWorld.getConfig(CONFIG_INT32_QUEST_LOW_LEVEL_HIDE_DIFF);
                    if (pQuest->IsAutoComplete() || (pQuest->IsRepeatable() && pPlayer->getQuestStatusMap()[quest_id].m_rewarded))
                    {
                        dialogStatusNew = DIALOG_STATUS_REWARD_REP;
                    }
                    else if (lowLevelDiff < 0 || pPlayer->getLevel() <= pPlayer->GetQuestLevelForPlayer(pQuest) + uint32(lowLevelDiff))
                    {
                        dialogStatusNew = DIALOG_STATUS_AVAILABLE;
                    }
                    else
                        { dialogStatusNew = DIALOG_STATUS_CHAT; }
                }
                else
                    { dialogStatusNew = DIALOG_STATUS_UNAVAILABLE; }
            }
        }

        if (dialogStatusNew > dialogStatus)
            { dialogStatus = dialogStatusNew; }
    }

    return dialogStatus;
}

void WorldSession::HandleQuestgiverStatusMultipleQuery(WorldPacket& /*recvPacket*/)
{
    DEBUG_LOG("WORLD: Received opcode CMSG_QUESTGIVER_STATUS_MULTIPLE_QUERY");

    uint32 count = 0;

    WorldPacket data(SMSG_QUESTGIVER_STATUS_MULTIPLE, 4);
    data << uint32(count);                                  // placeholder

    for (GuidSet::const_iterator itr = _player->m_clientGUIDs.begin(); itr != _player->m_clientGUIDs.end(); ++itr)
    {
        uint8 dialogStatus = DIALOG_STATUS_NONE;

        if (itr->IsAnyTypeCreature())
        {
            // need also pet quests case support
            Creature* questgiver = GetPlayer()->GetMap()->GetAnyTypeCreature(*itr);

            if (!questgiver || questgiver->IsHostileTo(_player))
                { continue; }

            if (!questgiver->HasFlag(UNIT_NPC_FLAGS, UNIT_NPC_FLAG_QUESTGIVER))
                { continue; }

            dialogStatus = sScriptMgr.GetDialogStatus(_player, questgiver);

            if (dialogStatus == DIALOG_STATUS_UNDEFINED)
                { dialogStatus = getDialogStatus(_player, questgiver, DIALOG_STATUS_NONE); }

            data << questgiver->GetObjectGuid();
            data << uint8(dialogStatus);
            ++count;
        }
        else if (itr->IsGameObject())
        {
            GameObject* questgiver = GetPlayer()->GetMap()->GetGameObject(*itr);

            if (!questgiver)
                { continue; }

            if (questgiver->GetGoType() != GAMEOBJECT_TYPE_QUESTGIVER)
                { continue; }

            dialogStatus = sScriptMgr.GetDialogStatus(_player, questgiver);

            if (dialogStatus == DIALOG_STATUS_UNDEFINED)
                { dialogStatus = getDialogStatus(_player, questgiver, DIALOG_STATUS_NONE); }

            data << questgiver->GetObjectGuid();
            data << uint8(dialogStatus);
            ++count;
        }
    }

    data.put<uint32>(0, count);                             // write real count
    SendPacket(&data);
}

bool WorldSession::CanInteractWithQuestGiver(ObjectGuid guid, char const* descr)
{
    if (guid.IsCreature())
    {
        Creature* pCreature = _player->GetNPCIfCanInteractWith(guid, UNIT_NPC_FLAG_QUESTGIVER);
        if (!pCreature)
        {
            DEBUG_LOG("WORLD: %s - %s can not interact with %s.", descr, _player->GetGuidStr().c_str(), guid.GetString().c_str());
            return false;
        }
    }
    else if (guid.IsGameObject())
    {
        GameObject* pGo = _player->GetGameObjectIfCanInteractWith(guid, GAMEOBJECT_TYPE_QUESTGIVER);
        if (!pGo)
        {
            DEBUG_LOG("WORLD: %s - %s can not interact with %s.", descr, _player->GetGuidStr().c_str(), guid.GetString().c_str());
            return false;
        }
    }
    else if (!_player->IsAlive())
    {
        DEBUG_LOG("WORLD: %s - %s is dead, requested guid was %s", descr, _player->GetGuidStr().c_str(), guid.GetString().c_str());
        return false;
    }

    return true;
}