/*
 * Copyright (C) 2008-2015 TrinityCore <http://www.trinitycore.org/>
 * Copyright (C) 2005-2009 MaNGOS <http://getmangos.com/>
 *
 * 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 "Common.h"
#include "DatabaseEnv.h"
#include "Group.h"
#include "GroupMgr.h"
#include "Log.h"
#include "ObjectMgr.h"
#include "Opcodes.h"
#include "Pet.h"
#include "Player.h"
#include "SocialMgr.h"
#include "SpellAuras.h"
#include "Util.h"
#include "Vehicle.h"
#include "World.h"
#include "WorldPacket.h"
#include "WorldSession.h"
#include "SpellAuraEffects.h"

class Aura;

/* differeces from off:
    -you can uninvite yourself - is is useful
    -you can accept invitation even if leader went offline
*/
/* todo:
    -group_destroyed msg is sent but not shown
    -reduce xp gaining when in raid group
    -quest sharing has to be corrected
    -FIX sending PartyMemberStats
*/

void WorldSession::SendPartyResult(PartyOperation operation, const std::string& member, PartyResult res, uint32 val /* = 0 */)
{
    WorldPacket data(SMSG_PARTY_COMMAND_RESULT, 4 + member.size() + 1 + 4 + 4 + 8);
    data << uint32(operation);
    data << member;
    data << uint32(res);
    data << uint32(val);                                    // LFD cooldown related (used with ERR_PARTY_LFG_BOOT_COOLDOWN_S and ERR_PARTY_LFG_BOOT_NOT_ELIGIBLE_S)
    data << uint64(0); // player who caused error (in some cases).

    SendPacket(&data);
}

void WorldSession::HandleGroupInviteOpcode(WorldPacket& recvData)
{
    TC_LOG_DEBUG("network", "WORLD: Received CMSG_GROUP_INVITE");

    ObjectGuid crossRealmGuid; // unused

    recvData.read_skip<uint32>(); // Non-zero in cross realm invites
    recvData.read_skip<uint32>(); // Always 0

    crossRealmGuid[2] = recvData.ReadBit();
    crossRealmGuid[7] = recvData.ReadBit();

    uint8 realmLen = recvData.ReadBits(9);

    crossRealmGuid[3] = recvData.ReadBit();

    uint8 nameLen = recvData.ReadBits(10);

    crossRealmGuid[5] = recvData.ReadBit();
    crossRealmGuid[4] = recvData.ReadBit();
    crossRealmGuid[6] = recvData.ReadBit();
    crossRealmGuid[0] = recvData.ReadBit();
    crossRealmGuid[1] = recvData.ReadBit();

    recvData.ReadByteSeq(crossRealmGuid[4]);
    recvData.ReadByteSeq(crossRealmGuid[7]);
    recvData.ReadByteSeq(crossRealmGuid[6]);

    std::string memberName, realmName;
    memberName = recvData.ReadString(nameLen);
    realmName = recvData.ReadString(realmLen); // unused

    recvData.ReadByteSeq(crossRealmGuid[1]);
    recvData.ReadByteSeq(crossRealmGuid[0]);
    recvData.ReadByteSeq(crossRealmGuid[5]);
    recvData.ReadByteSeq(crossRealmGuid[3]);
    recvData.ReadByteSeq(crossRealmGuid[2]);

    // attempt add selected player

    // cheating
    if (!normalizePlayerName(memberName))
    {
        SendPartyResult(PARTY_OP_INVITE, memberName, ERR_BAD_PLAYER_NAME_S);
        return;
    }

    Player* player = ObjectAccessor::FindPlayerByName(memberName);

    // no player
    if (!player)
    {
        SendPartyResult(PARTY_OP_INVITE, memberName, ERR_BAD_PLAYER_NAME_S);
        return;
    }

    // restrict invite to GMs
    if (!sWorld->getBoolConfig(CONFIG_ALLOW_GM_GROUP) && !GetPlayer()->IsGameMaster() && player->IsGameMaster())
    {
        SendPartyResult(PARTY_OP_INVITE, memberName, ERR_BAD_PLAYER_NAME_S);
        return;
    }

    // can't group with
    if (!GetPlayer()->IsGameMaster() && !sWorld->getBoolConfig(CONFIG_ALLOW_TWO_SIDE_INTERACTION_GROUP) && GetPlayer()->GetTeam() != player->GetTeam())
    {
        SendPartyResult(PARTY_OP_INVITE, memberName, ERR_PLAYER_WRONG_FACTION);
        return;
    }
    if (GetPlayer()->GetInstanceId() != 0 && player->GetInstanceId() != 0 && GetPlayer()->GetInstanceId() != player->GetInstanceId() && GetPlayer()->GetMapId() == player->GetMapId())
    {
        SendPartyResult(PARTY_OP_INVITE, memberName, ERR_TARGET_NOT_IN_INSTANCE_S);
        return;
    }
    // just ignore us
    if (player->GetInstanceId() != 0 && player->GetDungeonDifficultyID() != GetPlayer()->GetDungeonDifficultyID())
    {
        SendPartyResult(PARTY_OP_INVITE, memberName, ERR_IGNORING_YOU_S);
        return;
    }

    if (player->GetSocial()->HasIgnore(GetPlayer()->GetGUID()))
    {
        SendPartyResult(PARTY_OP_INVITE, memberName, ERR_IGNORING_YOU_S);
        return;
    }

    ObjectGuid invitedGuid = player->GetGUID();

    Group* group = GetPlayer()->GetGroup();
    if (group && group->isBGGroup())
        group = GetPlayer()->GetOriginalGroup();

    Group* group2 = player->GetGroup();
    if (group2 && group2->isBGGroup())
        group2 = player->GetOriginalGroup();
    // player already in another group or invited
    if (group2 || player->GetGroupInvite())
    {
        SendPartyResult(PARTY_OP_INVITE, memberName, ERR_ALREADY_IN_GROUP_S);

        if (group2)
        {
            // tell the player that they were invited but it failed as they were already in a group
            WorldPacket data(SMSG_PARTY_INVITE, 45);

            data.WriteBit(0);

            data.WriteBit(invitedGuid[0]);
            data.WriteBit(invitedGuid[3]);
            data.WriteBit(invitedGuid[2]);

            data.WriteBit(0); // Inverse already in group

            data.WriteBit(invitedGuid[6]);
            data.WriteBit(invitedGuid[5]);

            data.WriteBits(0, 9); // Realm name

            data.WriteBit(invitedGuid[4]);

            data.WriteBits(GetPlayer()->GetName().size(), 7); // Inviter name length

            data.WriteBits(0, 24); // Count 2

            data.WriteBit(0);

            data.WriteBit(invitedGuid[1]);
            data.WriteBit(invitedGuid[7]);

            data.FlushBits();

            data.WriteByteSeq(invitedGuid[1]);
            data.WriteByteSeq(invitedGuid[4]);

            data << int32(getMSTime());
            data << int32(0);
            data << int32(0);

            data.WriteByteSeq(invitedGuid[6]);
            data.WriteByteSeq(invitedGuid[0]);
            data.WriteByteSeq(invitedGuid[2]);
            data.WriteByteSeq(invitedGuid[3]);

            // for count2 { int32(0) }

            data.WriteByteSeq(invitedGuid[5]);

            // data.append(realm name);

            data.WriteByteSeq(invitedGuid[7]);

            data.WriteString(GetPlayer()->GetName()); // inviter name

            data << int32(0);

            player->GetSession()->SendPacket(&data);
        }

        return;
    }

    if (group)
    {
        // not have permissions for invite
        if (!group->IsLeader(GetPlayer()->GetGUID()) && !group->IsAssistant(GetPlayer()->GetGUID()))
        {
            SendPartyResult(PARTY_OP_INVITE, "", ERR_NOT_LEADER);
            return;
        }
        // not have place
        if (group->IsFull())
        {
            SendPartyResult(PARTY_OP_INVITE, "", ERR_GROUP_FULL);
            return;
        }
    }

    // ok, but group not exist, start a new group
    // but don't create and save the group to the DB until
    // at least one person joins
    if (!group)
    {
        group = new Group;
        // new group: if can't add then delete
        if (!group->AddLeaderInvite(GetPlayer()))
        {
            delete group;
            return;
        }
        if (!group->AddInvite(player))
        {
            delete group;
            return;
        }
    }
    else
    {
        // already existed group: if can't add then just leave
        if (!group->AddInvite(player))
        {
            return;
        }
    }

    // ok, we do it
    WorldPacket data(SMSG_PARTY_INVITE, 45);

    data.WriteBit(0);

    data.WriteBit(invitedGuid[0]);
    data.WriteBit(invitedGuid[3]);
    data.WriteBit(invitedGuid[2]);

    data.WriteBit(1); // Inverse already in group

    data.WriteBit(invitedGuid[6]);
    data.WriteBit(invitedGuid[5]);

    data.WriteBits(0, 9); // Realm name

    data.WriteBit(invitedGuid[4]);

    data.WriteBits(GetPlayer()->GetName().size(), 7); // Inviter name length

    data.WriteBits(0, 24); // Count 2

    data.WriteBit(0);

    data.WriteBit(invitedGuid[1]);
    data.WriteBit(invitedGuid[7]);

    data.FlushBits();

    data.WriteByteSeq(invitedGuid[1]);
    data.WriteByteSeq(invitedGuid[4]);

    data << int32(getMSTime());
    data << int32(0);
    data << int32(0);

    data.WriteByteSeq(invitedGuid[6]);
    data.WriteByteSeq(invitedGuid[0]);
    data.WriteByteSeq(invitedGuid[2]);
    data.WriteByteSeq(invitedGuid[3]);

    // for count2 { int32(0) }

    data.WriteByteSeq(invitedGuid[5]);

    // data.append(realm name);

    data.WriteByteSeq(invitedGuid[7]);

    data.WriteString(GetPlayer()->GetName());

    data << int32(0);

    player->GetSession()->SendPacket(&data);

    SendPartyResult(PARTY_OP_INVITE, memberName, ERR_PARTY_RESULT_OK);
}

void WorldSession::HandleGroupInviteResponseOpcode(WorldPacket& recvData)
{
    TC_LOG_DEBUG("network", "WORLD: Received CMSG_GROUP_INVITE_RESPONSE");

    recvData.ReadBit(); // unk always 0
    bool accept = recvData.ReadBit();

    // Never actually received?
    /*if (accept)
        recvData.read_skip<uint32>(); // unk*/

    Group* group = GetPlayer()->GetGroupInvite();

    if (!group)
        return;

    if (accept)
    {
        // Remove player from invitees in any case
        group->RemoveInvite(GetPlayer());

        if (group->GetLeaderGUID() == GetPlayer()->GetGUID())
        {
            TC_LOG_ERROR("network", "HandleGroupAcceptOpcode: player %s (%s) tried to accept an invite to his own group", GetPlayer()->GetName().c_str(), GetPlayer()->GetGUID().ToString().c_str());
            return;
        }

        // Group is full
        if (group->IsFull())
        {
            SendPartyResult(PARTY_OP_INVITE, "", ERR_GROUP_FULL);
            return;
        }

        Player* leader = ObjectAccessor::FindPlayer(group->GetLeaderGUID());

        // Forming a new group, create it
        if (!group->IsCreated())
        {
            // This can happen if the leader is zoning. To be removed once delayed actions for zoning are implemented
            if (!leader)
            {
                group->RemoveAllInvites();
                return;
            }

            // If we're about to create a group there really should be a leader present
            ASSERT(leader);
            group->RemoveInvite(leader);
            group->Create(leader);
            sGroupMgr->AddGroup(group);
        }

        // Everything is fine, do it, PLAYER'S GROUP IS SET IN ADDMEMBER!!!
        if (!group->AddMember(GetPlayer()))
            return;

        group->BroadcastGroupUpdate();
    }
    else
    {
        // Remember leader if online (group pointer will be invalid if group gets disbanded)
        Player* leader = ObjectAccessor::FindConnectedPlayer(group->GetLeaderGUID());

        // uninvite, group can be deleted
        GetPlayer()->UninviteFromGroup();

        if (!leader || !leader->GetSession())
            return;

        // report
        WorldPacket data(SMSG_GROUP_DECLINE, GetPlayer()->GetName().size());
        data << GetPlayer()->GetName();
        leader->GetSession()->SendPacket(&data);
    }
}

void WorldSession::HandleGroupUninviteOpcode(WorldPacket& recvData)
{
    TC_LOG_DEBUG("network", "WORLD: Received CMSG_PARTY_UNINVITE");

    ObjectGuid guid;
    std::string reason;
    recvData >> guid;
    recvData >> reason;

    //can't uninvite yourself
    if (guid == GetPlayer()->GetGUID())
    {
        TC_LOG_ERROR("network", "WorldSession::HandleGroupUninviteGuidOpcode: leader %s (%s) tried to uninvite himself from the group.",
            GetPlayer()->GetName().c_str(), GetPlayer()->GetGUID().ToString().c_str());
        return;
    }

    PartyResult res = GetPlayer()->CanUninviteFromGroup(guid);
    if (res != ERR_PARTY_RESULT_OK)
    {
        SendPartyResult(PARTY_OP_UNINVITE, "", res);
        return;
    }

    Group* grp = GetPlayer()->GetGroup();
    // grp is checked already above in CanUninviteFromGroup()
    ASSERT(grp);

    if (grp->IsMember(guid))
    {
        Player::RemoveFromGroup(grp, guid, GROUP_REMOVEMETHOD_KICK, GetPlayer()->GetGUID(), reason.c_str());
        return;
    }

    if (Player* player = grp->GetInvited(guid))
    {
        player->UninviteFromGroup();
        return;
    }

    SendPartyResult(PARTY_OP_UNINVITE, "", ERR_TARGET_NOT_IN_GROUP_S);
}

void WorldSession::HandleGroupSetLeaderOpcode(WorldPacket& recvData)
{
    TC_LOG_DEBUG("network", "WORLD: Received CMSG_SET_ROLE");

    ObjectGuid guid;
    recvData >> guid;

    Player* player = ObjectAccessor::FindConnectedPlayer(guid);
    Group* group = GetPlayer()->GetGroup();

    if (!group || !player)
        return;

    if (!group->IsLeader(GetPlayer()->GetGUID()) || player->GetGroup() != group)
        return;

    // Everything's fine, accepted.
    group->ChangeLeader(guid);
    group->SendUpdate();
}

void WorldSession::HandleGroupSetRolesOpcode(WorldPacket& recvData)
{
    TC_LOG_DEBUG("network", "WORLD: Received CMSG_GROUP_SET_ROLES");

    uint32 newRole;
    ObjectGuid guid1;                   // Assigner GUID
    ObjectGuid guid2;                   // Target GUID

    guid1 = GetPlayer()->GetGUID();

    recvData >> newRole;

    guid2[2] = recvData.ReadBit();
    guid2[6] = recvData.ReadBit();
    guid2[3] = recvData.ReadBit();
    guid2[7] = recvData.ReadBit();
    guid2[5] = recvData.ReadBit();
    guid2[1] = recvData.ReadBit();
    guid2[0] = recvData.ReadBit();
    guid2[4] = recvData.ReadBit();

    recvData.ReadByteSeq(guid2[6]);
    recvData.ReadByteSeq(guid2[4]);
    recvData.ReadByteSeq(guid2[1]);
    recvData.ReadByteSeq(guid2[3]);
    recvData.ReadByteSeq(guid2[0]);
    recvData.ReadByteSeq(guid2[5]);
    recvData.ReadByteSeq(guid2[2]);
    recvData.ReadByteSeq(guid2[7]);

    WorldPacket data(SMSG_ROLE_CHANGED_INFORM, 24);

    data.WriteBit(guid1[1]);
    data.WriteBit(guid2[0]);
    data.WriteBit(guid2[2]);
    data.WriteBit(guid2[4]);
    data.WriteBit(guid2[7]);
    data.WriteBit(guid2[3]);
    data.WriteBit(guid1[7]);
    data.WriteBit(guid2[5]);
    data.WriteBit(guid1[5]);
    data.WriteBit(guid1[4]);
    data.WriteBit(guid1[3]);
    data.WriteBit(guid2[6]);
    data.WriteBit(guid1[2]);
    data.WriteBit(guid1[6]);
    data.WriteBit(guid2[1]);
    data.WriteBit(guid1[0]);

    data.WriteByteSeq(guid1[7]);
    data.WriteByteSeq(guid2[3]);
    data.WriteByteSeq(guid1[6]);
    data.WriteByteSeq(guid2[4]);
    data.WriteByteSeq(guid2[0]);
    data << uint32(newRole);            // New Role
    data.WriteByteSeq(guid2[6]);
    data.WriteByteSeq(guid2[2]);
    data.WriteByteSeq(guid1[0]);
    data.WriteByteSeq(guid1[4]);
    data.WriteByteSeq(guid2[1]);
    data.WriteByteSeq(guid1[3]);
    data.WriteByteSeq(guid1[5]);
    data.WriteByteSeq(guid1[2]);
    data.WriteByteSeq(guid2[5]);
    data.WriteByteSeq(guid2[7]);
    data.WriteByteSeq(guid1[1]);
    data << uint32(0);                  // Old Role

    if (Group* group = GetPlayer()->GetGroup())
    {
        /// @todo probably should be sent only if (oldRole != newRole)
        group->BroadcastPacket(&data, false);
        group->SetLfgRoles(guid2, newRole);
    }
    else
        SendPacket(&data);
}

void WorldSession::HandleGroupDisbandOpcode(WorldPacket& /*recvData*/)
{
    TC_LOG_DEBUG("network", "WORLD: Received CMSG_LEAVE_GROUP");

    Group* grp = GetPlayer()->GetGroup();
    if (!grp)
        return;

    if (_player->InBattleground())
    {
        SendPartyResult(PARTY_OP_INVITE, "", ERR_INVITE_RESTRICTED);
        return;
    }

    /** error handling **/
    /********************/

    // everything's fine, do it
    SendPartyResult(PARTY_OP_LEAVE, GetPlayer()->GetName(), ERR_PARTY_RESULT_OK);

    GetPlayer()->RemoveFromGroup(GROUP_REMOVEMETHOD_LEAVE);
}

void WorldSession::HandleLootMethodOpcode(WorldPacket& recvData)
{
    TC_LOG_DEBUG("network", "WORLD: Received CMSG_LOOT_METHOD");

    uint32 lootMethod;
    ObjectGuid lootMaster;
    uint32 lootThreshold;
    recvData >> lootMethod >> lootMaster >> lootThreshold;

    Group* group = GetPlayer()->GetGroup();
    if (!group)
        return;

    /** error handling **/
    if (!group->IsLeader(GetPlayer()->GetGUID()))
        return;

    if (lootMethod > NEED_BEFORE_GREED)
        return;

    if (lootThreshold < ITEM_QUALITY_UNCOMMON || lootThreshold > ITEM_QUALITY_ARTIFACT)
        return;

    if (lootMethod == MASTER_LOOT && !group->IsMember(lootMaster))
        return;
    /********************/

    // everything's fine, do it
    group->SetLootMethod((LootMethod)lootMethod);
    group->SetMasterLooterGuid(lootMaster);
    group->SetLootThreshold((ItemQualities)lootThreshold);
    group->SendUpdate();
}

void WorldSession::HandleLootRoll(WorldPacket& recvData)
{
    ObjectGuid guid;
    uint32 itemSlot;
    uint8  rollType;
    recvData >> guid;                  // guid of the item rolled
    recvData >> itemSlot;
    recvData >> rollType;              // 0: pass, 1: need, 2: greed

    Group* group = GetPlayer()->GetGroup();
    if (!group)
        return;

    group->CountRollVote(GetPlayer()->GetGUID(), guid, rollType);

    switch (rollType)
    {
        case ROLL_NEED:
            GetPlayer()->UpdateAchievementCriteria(ACHIEVEMENT_CRITERIA_TYPE_ROLL_NEED, 1);
            break;
        case ROLL_GREED:
            GetPlayer()->UpdateAchievementCriteria(ACHIEVEMENT_CRITERIA_TYPE_ROLL_GREED, 1);
            break;
    }
}

void WorldSession::HandleMinimapPingOpcode(WorldPacket& recvData)
{
    TC_LOG_DEBUG("network", "WORLD: Received MSG_MINIMAP_PING");

    if (!GetPlayer()->GetGroup())
        return;

    float x, y;
    recvData >> x;
    recvData >> y;

    //TC_LOG_DEBUG("misc", "Received opcode MSG_MINIMAP_PING X: %f, Y: %f", x, y);

    /** error handling **/
    /********************/

    // everything's fine, do it
    WorldPacket data(SMSG_MINIMAP_PING, (8+4+4));
    data << GetPlayer()->GetGUID();
    data << float(x);
    data << float(y);
    GetPlayer()->GetGroup()->BroadcastPacket(&data, true, -1, GetPlayer()->GetGUID());
}

void WorldSession::HandleRandomRollOpcode(WorldPacket& recvData)
{
    TC_LOG_DEBUG("network", "WORLD: Received CMSG_RANDOM_ROLL");

    uint32 minimum, maximum, roll;
    recvData >> minimum;
    recvData >> maximum;

    /** error handling **/
    if (minimum > maximum || maximum > 10000)                // < 32768 for urand call
        return;
    /********************/

    // everything's fine, do it
    roll = urand(minimum, maximum);

    //TC_LOG_DEBUG("misc", "ROLL: MIN: %u, MAX: %u, ROLL: %u", minimum, maximum, roll);

    WorldPacket data(SMSG_RANDOM_ROLL, 4+4+4+8);
    data << uint32(minimum);
    data << uint32(maximum);
    data << uint32(roll);
    data << GetPlayer()->GetGUID();
    if (GetPlayer()->GetGroup())
        GetPlayer()->GetGroup()->BroadcastPacket(&data, false);
    else
        SendPacket(&data);
}

void WorldSession::HandleRaidTargetUpdateOpcode(WorldPacket& recvData)
{
    TC_LOG_DEBUG("network", "WORLD: Received MSG_RAID_TARGET_UPDATE");

    Group* group = GetPlayer()->GetGroup();
    if (!group)
        return;

    uint8 x;
    recvData >> x;

    /** error handling **/
    /********************/

    // everything's fine, do it
    if (x == 0xFF)                                           // target icon request
        group->SendTargetIconList(this);
    else                                                    // target icon update
    {
        if (group->isRaidGroup() && !group->IsLeader(GetPlayer()->GetGUID()) && !group->IsAssistant(GetPlayer()->GetGUID()))
            return;

        ObjectGuid guid;
        recvData >> guid;

        if (guid.IsPlayer())
        {
            Player* target = ObjectAccessor::FindConnectedPlayer(guid);

            if (!target || target->IsHostileTo(GetPlayer()))
                return;
        }

        group->SetTargetIcon(x, _player->GetGUID(), guid);
    }
}

void WorldSession::HandleGroupRaidConvertOpcode(WorldPacket& recvData)
{
    TC_LOG_DEBUG("network", "WORLD: Received CMSG_CONVERT_RAID");

    Group* group = GetPlayer()->GetGroup();
    if (!group)
        return;

    if (_player->InBattleground())
        return;

    // error handling
    if (!group->IsLeader(GetPlayer()->GetGUID()) || group->GetMembersCount() < 2)
        return;

    // everything's fine, do it (is it 0 (PARTY_OP_INVITE) correct code)
    SendPartyResult(PARTY_OP_INVITE, "", ERR_PARTY_RESULT_OK);

    // New 4.x: it is now possible to convert a raid to a group if member count is 5 or less

    bool toRaid;
    recvData >> toRaid;

    if (toRaid)
        group->ConvertToRaid();
    else
        group->ConvertToGroup();
}

void WorldSession::HandleGroupRequestJoinUpdates(WorldPacket& /*recvData*/)
{
    Group* group = GetPlayer()->GetGroup();
    if (!group)
        return;

    WorldPacket data(SMSG_REAL_GROUP_UPDATE, 1 + 4 + 8);
    data << uint8(group->GetGroupType());
    data << uint32(group->GetMembersCount() - 1);
    data << group->GetLeaderGUID();
    SendPacket(&data);
}

void WorldSession::HandleGroupChangeSubGroupOpcode(WorldPacket& recvData)
{
    TC_LOG_DEBUG("network", "WORLD: Received CMSG_CHANGE_SUB_GROUP");

    // we will get correct pointer for group here, so we don't have to check if group is BG raid
    Group* group = GetPlayer()->GetGroup();
    if (!group)
        return;

    std::string name;
    uint8 groupNr;
    recvData >> name;
    recvData >> groupNr;

    if (groupNr >= MAX_RAID_SUBGROUPS)
        return;

    ObjectGuid senderGuid = GetPlayer()->GetGUID();
    if (!group->IsLeader(senderGuid) && !group->IsAssistant(senderGuid))
        return;

    if (!group->HasFreeSlotSubGroup(groupNr))
        return;

    Player* movedPlayer = ObjectAccessor::FindConnectedPlayerByName(name);
    ObjectGuid guid;

    if (movedPlayer)
        guid = movedPlayer->GetGUID();
    else
    {
        CharacterDatabase.EscapeString(name);
        guid = ObjectMgr::GetPlayerGUIDByName(name.c_str());
    }

    group->ChangeMembersGroup(guid, groupNr);
}

void WorldSession::HandleGroupSwapSubGroupOpcode(WorldPacket& recvData)
{
    TC_LOG_DEBUG("network", "WORLD: Received CMSG_SWAP_SUB_GROUPS");
    std::string unk1;
    std::string unk2;

    recvData >> unk1;
    recvData >> unk2;
}

void WorldSession::HandleGroupAssistantLeaderOpcode(WorldPacket& recvData)
{
    TC_LOG_DEBUG("network", "WORLD: Received CMSG_SET_ASSISTANT_LEADER");

    Group* group = GetPlayer()->GetGroup();
    if (!group)
        return;

    if (!group->IsLeader(GetPlayer()->GetGUID()))
        return;

    ObjectGuid guid;
    bool apply;
    recvData >> guid;
    recvData >> apply;

    group->SetGroupMemberFlag(guid, apply, MEMBER_FLAG_ASSISTANT);
}

void WorldSession::HandlePartyAssignmentOpcode(WorldPacket& recvData)
{
    TC_LOG_DEBUG("network", "WORLD: Received MSG_PARTY_ASSIGNMENT");

    Group* group = GetPlayer()->GetGroup();
    if (!group)
        return;

    ObjectGuid senderGuid = GetPlayer()->GetGUID();
    if (!group->IsLeader(senderGuid) && !group->IsAssistant(senderGuid))
        return;

    uint8 assignment;
    bool apply;
    ObjectGuid guid;
    recvData >> assignment >> apply;
    recvData >> guid;

    switch (assignment)
    {
        case GROUP_ASSIGN_MAINASSIST:
            group->RemoveUniqueGroupMemberFlag(MEMBER_FLAG_MAINASSIST);
            group->SetGroupMemberFlag(guid, apply, MEMBER_FLAG_MAINASSIST);
            break;
        case GROUP_ASSIGN_MAINTANK:
            group->RemoveUniqueGroupMemberFlag(MEMBER_FLAG_MAINTANK);           // Remove main assist flag from current if any.
            group->SetGroupMemberFlag(guid, apply, MEMBER_FLAG_MAINTANK);
        default:
            break;
    }

    group->SendUpdate();
}

void WorldSession::HandleRaidReadyCheckOpcode(WorldPacket& recvData)
{
    TC_LOG_DEBUG("network", "WORLD: Received CMSG_DO_READY_CHECK");

    Group* group = GetPlayer()->GetGroup();
    if (!group)
        return;

    if (recvData.empty())                                   // request
    {
        /** error handling **/
        if (!group->IsLeader(GetPlayer()->GetGUID()) && !group->IsAssistant(GetPlayer()->GetGUID()))
            return;
        /********************/

        // everything's fine, do it
        WorldPacket data(SMSG_READY_CHECK_STARTED, 8);
        data << GetPlayer()->GetGUID();
        group->BroadcastPacket(&data, false, -1);

        group->OfflineReadyCheck();
    }
    else                                                    // answer
    {
        uint8 state;
        recvData >> state;

        // everything's fine, do it
        WorldPacket data(SMSG_READY_CHECK_RESPONSE, 9);
        data << GetPlayer()->GetGUID();
        data << uint8(state);
        group->BroadcastReadyCheck(&data);
    }
}

void WorldSession::BuildPartyMemberStatsChangedPacket(Player* player, WorldPacket* data)
{
    uint32 mask = player->GetGroupUpdateFlag();

    if (mask == GROUP_UPDATE_FLAG_NONE)
        return;

    std::set<uint32> const& phases = player->GetPhases();

    if (mask & GROUP_UPDATE_FLAG_POWER_TYPE)                // if update power type, update current/max power also
        mask |= (GROUP_UPDATE_FLAG_CUR_POWER | GROUP_UPDATE_FLAG_MAX_POWER);

    if (mask & GROUP_UPDATE_FLAG_PET_POWER_TYPE)            // same for pets
        mask |= (GROUP_UPDATE_FLAG_PET_CUR_POWER | GROUP_UPDATE_FLAG_PET_MAX_POWER);

    data->Initialize(SMSG_PARTY_MEMBER_STATS, 80);          // average value
    *data << player->GetPackGUID();
    *data << uint32(mask);

    if (mask & GROUP_UPDATE_FLAG_STATUS)
    {
        uint16 playerStatus = MEMBER_STATUS_ONLINE;
        if (player->IsPvP())
            playerStatus |= MEMBER_STATUS_PVP;

        if (!player->IsAlive())
        {
            if (player->HasFlag(PLAYER_FLAGS, PLAYER_FLAGS_GHOST))
                playerStatus |= MEMBER_STATUS_GHOST;
            else
                playerStatus |= MEMBER_STATUS_DEAD;
        }

        if (player->IsFFAPvP())
            playerStatus |= MEMBER_STATUS_PVP_FFA;

        if (player->isAFK())
            playerStatus |= MEMBER_STATUS_AFK;

        if (player->isDND())
            playerStatus |= MEMBER_STATUS_DND;

        *data << uint16(playerStatus);
    }

    if (mask & GROUP_UPDATE_FLAG_CUR_HP)
        *data << uint32(player->GetHealth());

    if (mask & GROUP_UPDATE_FLAG_MAX_HP)
        *data << uint32(player->GetMaxHealth());

    Powers powerType = player->getPowerType();
    if (mask & GROUP_UPDATE_FLAG_POWER_TYPE)
        *data << uint8(powerType);

    if (mask & GROUP_UPDATE_FLAG_CUR_POWER)
        *data << uint16(player->GetPower(powerType));

    if (mask & GROUP_UPDATE_FLAG_MAX_POWER)
        *data << uint16(player->GetMaxPower(powerType));

    if (mask & GROUP_UPDATE_FLAG_LEVEL)
        *data << uint16(player->getLevel());

    if (mask & GROUP_UPDATE_FLAG_ZONE)
        *data << uint16(player->GetZoneId());

    if (mask & GROUP_UPDATE_FLAG_UNK100)
        *data << uint16(0);

    if (mask & GROUP_UPDATE_FLAG_POSITION)
    {
        *data << uint16(player->GetPositionX());
        *data << uint16(player->GetPositionY());
        *data << uint16(player->GetPositionZ());
    }

    if (mask & GROUP_UPDATE_FLAG_AURAS)
    {
        *data << uint8(0);
        uint64 auramask = player->GetAuraUpdateMaskForRaid();
        *data << uint64(auramask);
        *data << uint32(MAX_AURAS); // count
        for (uint32 i = 0; i < MAX_AURAS; ++i)
        {
            if (auramask & (uint64(1) << i))
            {
                AuraApplication const* aurApp = player->GetVisibleAura(i);
                if (!aurApp)
                {
                    *data << uint32(0);
                    *data << uint16(0);
                    continue;
                }

                *data << uint32(aurApp->GetBase()->GetId());
                *data << uint16(aurApp->GetFlags());

                if (aurApp->GetFlags() & AFLAG_SCALABLE)
                {
                    for (uint32 i = 0; i < MAX_SPELL_EFFECTS; ++i)
                    {
                        if (AuraEffect const* eff = aurApp->GetBase()->GetEffect(i))
                            *data << int32(eff->GetAmount());
                        else
                            *data << int32(0);
                    }
                }
            }
        }
    }

    Pet* pet = player->GetPet();
    if (mask & GROUP_UPDATE_FLAG_PET_GUID)
    {
        if (pet)
            *data << pet->GetGUID();
        else
            *data << ObjectGuid::Empty;
    }

    if (mask & GROUP_UPDATE_FLAG_PET_NAME)
    {
        if (pet)
            *data << pet->GetName();
        else
            *data << uint8(0);
    }

    if (mask & GROUP_UPDATE_FLAG_PET_MODEL_ID)
    {
        if (pet)
            *data << uint16(pet->GetDisplayId());
        else
            *data << uint16(0);
    }

    if (mask & GROUP_UPDATE_FLAG_PET_CUR_HP)
    {
        if (pet)
            *data << uint32(pet->GetHealth());
        else
            *data << uint32(0);
    }

    if (mask & GROUP_UPDATE_FLAG_PET_MAX_HP)
    {
        if (pet)
            *data << uint32(pet->GetMaxHealth());
        else
            *data << uint32(0);
    }

    if (mask & GROUP_UPDATE_FLAG_PET_POWER_TYPE)
    {
        if (pet)
            *data << uint8(pet->getPowerType());
        else
            *data << uint8(0);
    }

    if (mask & GROUP_UPDATE_FLAG_PET_CUR_POWER)
    {
        if (pet)
            *data << uint16(pet->GetPower(pet->getPowerType()));
        else
            *data << uint16(0);
    }

    if (mask & GROUP_UPDATE_FLAG_PET_MAX_POWER)
    {
        if (pet)
            *data << uint16(pet->GetMaxPower(pet->getPowerType()));
        else
            *data << uint16(0);
    }

    if (mask & GROUP_UPDATE_FLAG_PET_AURAS)
    {
        if (pet)
        {
            *data << uint8(0);
            uint64 auramask = pet->GetAuraUpdateMaskForRaid();
            *data << uint64(auramask);
            *data << uint32(MAX_AURAS); // count
            for (uint32 i = 0; i < MAX_AURAS; ++i)
            {
                if (auramask & (uint64(1) << i))
                {
                    AuraApplication const* aurApp = pet->GetVisibleAura(i);
                    if (!aurApp)
                    {
                        *data << uint32(0);
                        *data << uint16(0);
                        continue;
                    }

                    *data << uint32(aurApp->GetBase()->GetId());
                    *data << uint16(aurApp->GetFlags());

                    if (aurApp->GetFlags() & AFLAG_SCALABLE)
                    {
                        for (uint32 i = 0; i < MAX_SPELL_EFFECTS; ++i)
                        {
                            if (AuraEffect const* eff = aurApp->GetBase()->GetEffect(i))
                                *data << int32(eff->GetAmount());
                            else
                                *data << int32(0);
                        }
                    }
                }
            }
        }
        else
        {
            *data << uint8(0);
            *data << uint64(0);
        }
    }

    if (mask & GROUP_UPDATE_FLAG_VEHICLE_SEAT)
    {
        if (Vehicle* veh = player->GetVehicle())
            *data << uint32(veh->GetVehicleInfo()->SeatID[player->m_movementInfo.transport.seat]);
        else
            *data << uint32(0);

    }

    if (mask & GROUP_UPDATE_FLAG_PHASE)
    {
        *data << uint32(phases.empty() ? 8 : 0);
        *data << uint32(phases.size());
        for (std::set<uint32>::const_iterator itr = phases.begin(); itr != phases.end(); ++itr)
            *data << uint16(*itr);
    }
}

/*this procedure handles clients CMSG_REQUEST_PARTY_MEMBER_STATS request*/
void WorldSession::HandleRequestPartyMemberStatsOpcode(WorldPacket& recvData)
{
    TC_LOG_DEBUG("network", "WORLD: Received CMSG_REQUEST_PARTY_MEMBER_STATS");
    ObjectGuid Guid;
    recvData >> Guid;

    Player* player = ObjectAccessor::FindConnectedPlayer(Guid);
    if (!player)
    {
        WorldPacket data(SMSG_PARTY_MEMBER_STATS_FULL, 3+4+2);
        data << uint8(0);                                   // only for SMSG_PARTY_MEMBER_STATS_FULL, probably arena/bg related
        data << Guid.WriteAsPacked();
        data << uint32(GROUP_UPDATE_FLAG_STATUS);
        data << uint16(MEMBER_STATUS_OFFLINE);
        SendPacket(&data);
        return;
    }

    Pet* pet = player->GetPet();
    Powers powerType = player->getPowerType();
    std::set<uint32> const& phases = player->GetPhases();

    WorldPacket data(SMSG_PARTY_MEMBER_STATS_FULL, 4+2+2+2+1+2*6+8+1+8);
    data << uint8(0);                                       // only for SMSG_PARTY_MEMBER_STATS_FULL, probably arena/bg related
    data << player->GetPackGUID();

    uint32 updateFlags = GROUP_UPDATE_FLAG_STATUS | GROUP_UPDATE_FLAG_CUR_HP | GROUP_UPDATE_FLAG_MAX_HP
                      | GROUP_UPDATE_FLAG_CUR_POWER | GROUP_UPDATE_FLAG_MAX_POWER | GROUP_UPDATE_FLAG_LEVEL
                      | GROUP_UPDATE_FLAG_ZONE | GROUP_UPDATE_FLAG_POSITION | GROUP_UPDATE_FLAG_AURAS
                      | GROUP_UPDATE_FLAG_PET_NAME | GROUP_UPDATE_FLAG_PET_MODEL_ID | GROUP_UPDATE_FLAG_PET_AURAS;

    if (powerType != POWER_MANA)
        updateFlags |= GROUP_UPDATE_FLAG_POWER_TYPE;

    if (pet)
        updateFlags |= GROUP_UPDATE_FLAG_PET_GUID | GROUP_UPDATE_FLAG_PET_CUR_HP | GROUP_UPDATE_FLAG_PET_MAX_HP
                    | GROUP_UPDATE_FLAG_PET_POWER_TYPE | GROUP_UPDATE_FLAG_PET_CUR_POWER | GROUP_UPDATE_FLAG_PET_MAX_POWER;

    if (player->GetVehicle())
        updateFlags |= GROUP_UPDATE_FLAG_VEHICLE_SEAT;

    if (!phases.empty())
        updateFlags |= GROUP_UPDATE_FLAG_PHASE;

    uint16 playerStatus = MEMBER_STATUS_ONLINE;
    if (player->IsPvP())
        playerStatus |= MEMBER_STATUS_PVP;

    if (!player->IsAlive())
    {
        if (player->HasFlag(PLAYER_FLAGS, PLAYER_FLAGS_GHOST))
            playerStatus |= MEMBER_STATUS_GHOST;
        else
            playerStatus |= MEMBER_STATUS_DEAD;
    }

    if (player->IsFFAPvP())
        playerStatus |= MEMBER_STATUS_PVP_FFA;

    if (player->isAFK())
        playerStatus |= MEMBER_STATUS_AFK;

    if (player->isDND())
        playerStatus |= MEMBER_STATUS_DND;

    data << uint32(updateFlags);
    data << uint16(playerStatus);                           // GROUP_UPDATE_FLAG_STATUS
    data << uint32(player->GetHealth());                    // GROUP_UPDATE_FLAG_CUR_HP
    data << uint32(player->GetMaxHealth());                 // GROUP_UPDATE_FLAG_MAX_HP
    if (updateFlags & GROUP_UPDATE_FLAG_POWER_TYPE)
        data << uint8(powerType);

    data << uint16(player->GetPower(powerType));            // GROUP_UPDATE_FLAG_CUR_POWER
    data << uint16(player->GetMaxPower(powerType));         // GROUP_UPDATE_FLAG_MAX_POWER
    data << uint16(player->getLevel());                     // GROUP_UPDATE_FLAG_LEVEL
    data << uint16(player->GetZoneId());                    // GROUP_UPDATE_FLAG_ZONE
    data << uint16(player->GetPositionX());                 // GROUP_UPDATE_FLAG_POSITION
    data << uint16(player->GetPositionY());                 // GROUP_UPDATE_FLAG_POSITION
    data << uint16(player->GetPositionZ());               // GROUP_UPDATE_FLAG_POSITION

    // GROUP_UPDATE_FLAG_AURAS
    data << uint8(1);
    uint64 auramask = 0;
    size_t maskPos = data.wpos();
    data << uint64(auramask);                          // placeholder
    data << uint32(MAX_AURAS);                         // count

    for (uint8 i = 0; i < MAX_AURAS; ++i)
    {
        if (AuraApplication const* aurApp = player->GetVisibleAura(i))
        {
            auramask |= (uint64(1) << i);

            data << uint32(aurApp->GetBase()->GetId());
            data << uint16(aurApp->GetFlags());

            if (aurApp->GetFlags() & AFLAG_SCALABLE)
            {
                for (uint32 i = 0; i < MAX_SPELL_EFFECTS; ++i)
                {
                    if (AuraEffect const* eff = aurApp->GetBase()->GetEffect(i))
                        data << int32(eff->GetAmount());
                    else
                        data << int32(0);
                }
            }
        }
    }

    data.put<uint64>(maskPos, auramask);                    // GROUP_UPDATE_FLAG_AURAS

    if (updateFlags & GROUP_UPDATE_FLAG_PET_GUID)
        data << pet->GetGUID();

    data << std::string(pet ? pet->GetName() : "");         // GROUP_UPDATE_FLAG_PET_NAME
    data << uint16(pet ? pet->GetDisplayId() : 0);          // GROUP_UPDATE_FLAG_PET_MODEL_ID

    if (updateFlags & GROUP_UPDATE_FLAG_PET_CUR_HP)
        data << uint32(pet->GetHealth());

    if (updateFlags & GROUP_UPDATE_FLAG_PET_MAX_HP)
        data << uint32(pet->GetMaxHealth());

    if (updateFlags & GROUP_UPDATE_FLAG_PET_POWER_TYPE)
        data << (uint8)pet->getPowerType();

    if (updateFlags & GROUP_UPDATE_FLAG_PET_CUR_POWER)
        data << uint16(pet->GetPower(pet->getPowerType()));

    if (updateFlags & GROUP_UPDATE_FLAG_PET_MAX_POWER)
        data << uint16(pet->GetMaxPower(pet->getPowerType()));

    // GROUP_UPDATE_FLAG_PET_AURAS
    uint64 petAuraMask = 0;
    data << uint8(1);
    maskPos = data.wpos();
    data << uint64(petAuraMask);                            // placeholder
    data << uint32(MAX_AURAS);                              // count
    if (pet)
    {
        for (uint8 i = 0; i < MAX_AURAS; ++i)
        {
            if (AuraApplication const* aurApp = pet->GetVisibleAura(i))
            {
                petAuraMask |= (uint64(1) << i);

                data << uint32(aurApp->GetBase()->GetId());
                data << uint16(aurApp->GetFlags());

                if (aurApp->GetFlags() & AFLAG_SCALABLE)
                {
                    for (uint32 i = 0; i < MAX_SPELL_EFFECTS; ++i)
                    {
                        if (AuraEffect const* eff = aurApp->GetBase()->GetEffect(i))
                            data << int32(eff->GetAmount());
                        else
                            data << int32(0);
                    }
                }
            }
        }
    }

    data.put<uint64>(maskPos, petAuraMask);                 // GROUP_UPDATE_FLAG_PET_AURAS

    if (updateFlags & GROUP_UPDATE_FLAG_VEHICLE_SEAT)
        data << uint32(player->GetVehicle()->GetVehicleInfo()->SeatID[player->m_movementInfo.transport.seat]);

    if (updateFlags & GROUP_UPDATE_FLAG_PHASE)
    {
        data << uint32(phases.empty() ? 8 : 0);
        data << uint32(phases.size());
        for (std::set<uint32>::const_iterator itr = phases.begin(); itr != phases.end(); ++itr)
            data << uint16(*itr);
    }

    SendPacket(&data);
}

void WorldSession::HandleRequestRaidInfoOpcode(WorldPacket& /*recvData*/)
{
    // every time the player checks the character screen
    _player->SendRaidInfo();
}

void WorldSession::HandleOptOutOfLootOpcode(WorldPacket& recvData)
{
    TC_LOG_DEBUG("network", "WORLD: Received CMSG_OPT_OUT_OF_LOOT");

    bool passOnLoot;
    recvData >> passOnLoot; // 1 always pass, 0 do not pass

    // ignore if player not loaded
    if (!GetPlayer())                                        // needed because STATUS_AUTHED
    {
        if (passOnLoot)
            TC_LOG_ERROR("network", "CMSG_OPT_OUT_OF_LOOT value<>0 for not-loaded character!");
        return;
    }

    GetPlayer()->SetPassOnGroupLoot(passOnLoot != 0);
}

void WorldSession::HandleRolePollBeginOpcode(WorldPacket& recvData)
{
    TC_LOG_DEBUG("network", "WORLD: Received CMSG_ROLE_POLL_BEGIN");

    Group* group = GetPlayer()->GetGroup();
    if (!group)
        return;

    if (recvData.empty())
    {
        if (!group->IsLeader(GetPlayer()->GetGUID()) && !group->IsAssistant(GetPlayer()->GetGUID()))
            return;

        ObjectGuid guid = GetPlayer()->GetGUID();

        WorldPacket data(SMSG_ROLE_POLL_INFORM, 8);
        data.WriteBit(guid[1]);
        data.WriteBit(guid[5]);
        data.WriteBit(guid[7]);
        data.WriteBit(guid[3]);
        data.WriteBit(guid[2]);
        data.WriteBit(guid[4]);
        data.WriteBit(guid[0]);
        data.WriteBit(guid[6]);
        data.WriteByteSeq(guid[4]);
        data.WriteByteSeq(guid[7]);
        data.WriteByteSeq(guid[0]);
        data.WriteByteSeq(guid[5]);
        data.WriteByteSeq(guid[1]);
        data.WriteByteSeq(guid[6]);
        data.WriteByteSeq(guid[2]);
        data.WriteByteSeq(guid[3]);

        GetPlayer()->GetGroup()->BroadcastPacket(&data, true);
    }
}