/**
 * 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) 2005-2016  MaNGOS project <http://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 "WorldPacket.h"
#include "Log.h"
#include "Corpse.h"
#include "GameObject.h"
#include "Player.h"
#include "ObjectAccessor.h"
#include "ObjectGuid.h"
#include "WorldSession.h"
#include "LootMgr.h"
#include "Object.h"
#include "Group.h"
#include "World.h"
#include "Util.h"
#include "DBCStores.h"
#ifdef ENABLE_ELUNA
#include "LuaEngine.h"
#endif /* ENABLE_ELUNA */

void WorldSession::HandleAutostoreLootItemOpcode(WorldPacket& recv_data)
{
    DEBUG_LOG("WORLD: CMSG_AUTOSTORE_LOOT_ITEM");
    Player*  player =   GetPlayer();
    ObjectGuid lguid = player->GetLootGuid();
    Loot*    loot;
    uint8    lootSlot;
    Item* pItem = NULL;

    recv_data >> lootSlot;

    switch (lguid.GetHigh())
    {
        case HIGHGUID_GAMEOBJECT:
        {
            GameObject* go = player->GetMap()->GetGameObject(lguid);

            // not check distance for GO in case owned GO (fishing bobber case, for example) or Fishing hole GO
            if (!go || ((go->GetOwnerGuid() != _player->GetObjectGuid() && go->GetGoType() != GAMEOBJECT_TYPE_FISHINGHOLE) && !go->IsWithinDistInMap(_player, INTERACTION_DISTANCE)))
            {
                player->SendLootRelease(lguid);
                return;
            }

            loot = &go->loot;
            break;
        }
        case HIGHGUID_ITEM:
        {
            pItem = player->GetItemByGuid(lguid);

            if (!pItem || !pItem->HasGeneratedLoot())
            {
                player->SendLootRelease(lguid);
                return;
            }

            loot = &pItem->loot;
            break;
        }
        case HIGHGUID_CORPSE:
        {
            Corpse* bones = player->GetMap()->GetCorpse(lguid);
            if (!bones)
            {
                player->SendLootRelease(lguid);
                return;
            }
            loot = &bones->loot;
            break;
        }
        case HIGHGUID_UNIT:
        {
            Creature* pCreature = GetPlayer()->GetMap()->GetCreature(lguid);

            bool ok_loot = pCreature && pCreature->IsAlive() == (player->getClass() == CLASS_ROGUE && pCreature->lootForPickPocketed);

            if (!ok_loot || !pCreature->IsWithinDistInMap(_player, INTERACTION_DISTANCE))
            {
                player->SendLootRelease(lguid);
                return;
            }

            loot = &pCreature->loot;
            break;
        }
        default:
        {
            sLog.outError("%s is unsupported for looting.", lguid.GetString().c_str());
            return;
        }
    }

    QuestItem* qitem = NULL;
    QuestItem* ffaitem = NULL;
    QuestItem* conditem = NULL;

    LootItem* item = loot->LootItemInSlot(lootSlot, player, &qitem, &ffaitem, &conditem);

    if (!item)
    {
        player->SendEquipError(EQUIP_ERR_ALREADY_LOOTED, NULL, NULL);
        return;
    }

    Group * group = player->GetGroup();

    /* Checking group conditions to be sure the player has the permissions to loot. */
    if(group)
    {
        WorldObject * pObject = player->GetMap()->GetWorldObject(lguid);

        switch(group->GetLootMethod())
        {
            case GROUP_LOOT:
            case NEED_BEFORE_GREED:
            {
                if ((!item->is_underthreshold && !group->IsRollDoneForItem(pObject, item)) || (item->winner && item->winner != player->GetObjectGuid()))
                {
                    player->SendEquipError(EQUIP_ERR_LOOT_CANT_LOOT_THAT_NOW, NULL, NULL, item->itemid);
                    return;
                }
                break;
            }
            case MASTER_LOOT:
            {
                if((item->winner && item->winner != player->GetObjectGuid()) || (!item->winner && !item->is_underthreshold && !item->freeforall))
                {
                    player->SendEquipError(EQUIP_ERR_LOOT_CANT_LOOT_THAT_NOW, NULL, NULL, item->itemid);
                    return;
                }
                break;
            }
            default:
                break;
        }
    }

    // questitems use the blocked field for other purposes
    if (!qitem && item->is_blocked)
    {
        player->SendLootRelease(lguid);
        return;
    }

    if (pItem)
        { pItem->SetLootState(ITEM_LOOT_CHANGED); }

    ItemPosCountVec dest;
    InventoryResult msg = player->CanStoreNewItem(NULL_BAG, NULL_SLOT, dest, item->itemid, item->count);
    if (msg == EQUIP_ERR_OK)
    {
        Item* newitem = player->StoreNewItem(dest, item->itemid, true, item->randomPropertyId);

        if (qitem)
        {
            qitem->is_looted = true;
            // freeforall is 1 if everyone's supposed to get the quest item.
            if (item->freeforall || loot->GetPlayerQuestItems().size() == 1)
                { player->SendNotifyLootItemRemoved(lootSlot); }
            else
                { loot->NotifyQuestItemRemoved(qitem->index); }
        }
        else
        {
            if (ffaitem)
            {
                // freeforall case, notify only one player of the removal
                ffaitem->is_looted = true;
                player->SendNotifyLootItemRemoved(lootSlot);
            }
            else
            {
                // not freeforall, notify everyone
                if (conditem)
                    { conditem->is_looted = true; }
                loot->NotifyItemRemoved(lootSlot);
            }
        }

        // if only one person is supposed to loot the item, then set it to looted
        if (!item->freeforall)
            { item->is_looted = true; }

        --loot->unlootedCount;

        player->SendNewItem(newitem, uint32(item->count), false, false, true);
    }
    else
        { player->SendEquipError(msg, NULL, NULL, item->itemid); }
}

void WorldSession::HandleLootMoneyOpcode(WorldPacket& /*recv_data*/)
{
    DEBUG_LOG("WORLD: CMSG_LOOT_MONEY");

    Player* player = GetPlayer();
    ObjectGuid guid = player->GetLootGuid();
    if (!guid)
        { return; }

    Loot* pLoot = NULL;
    Item* pItem = NULL;

    switch (guid.GetHigh())
    {
        case HIGHGUID_GAMEOBJECT:
        {
            GameObject* pGameObject = GetPlayer()->GetMap()->GetGameObject(guid);

            // not check distance for GO in case owned GO (fishing bobber case, for example)
            if (pGameObject && (pGameObject->GetOwnerGuid() == _player->GetObjectGuid() || pGameObject->IsWithinDistInMap(_player, INTERACTION_DISTANCE)))
                { pLoot = &pGameObject->loot; }

            break;
        }
        case HIGHGUID_CORPSE:                               // remove insignia ONLY in BG
        {
            Corpse* bones = _player->GetMap()->GetCorpse(guid);

            if (bones && bones->IsWithinDistInMap(_player, INTERACTION_DISTANCE))
                { pLoot = &bones->loot; }

            break;
        }
        case HIGHGUID_ITEM:
        {
            pItem = GetPlayer()->GetItemByGuid(guid);
            if (!pItem || !pItem->HasGeneratedLoot())
                { return; }

            pLoot = &pItem->loot;
            break;
        }
        case HIGHGUID_UNIT:
        {
            Creature* pCreature = GetPlayer()->GetMap()->GetCreature(guid);

            bool ok_loot = pCreature && pCreature->IsAlive() == (player->getClass() == CLASS_ROGUE && pCreature->lootForPickPocketed);

            if (ok_loot && pCreature->IsWithinDistInMap(_player, INTERACTION_DISTANCE))
                { pLoot = &pCreature->loot ; }

            break;
        }
        default:
            return;                                         // unlootable type
    }

    if (pLoot)
    {
        pLoot->NotifyMoneyRemoved();

        if (!guid.IsItem() && player->GetGroup())           // item can be looted only single player
        {
            Group* group = player->GetGroup();

            std::vector<Player*> playersNear;
            for (GroupReference* itr = group->GetFirstMember(); itr != NULL; itr = itr->next())
            {
                Player* playerGroup = itr->getSource();
                if (!playerGroup)
                    { continue; }
                if (player->IsWithinDistInMap(playerGroup, sWorld.getConfig(CONFIG_FLOAT_GROUP_XP_DISTANCE), false))
                    { playersNear.push_back(playerGroup); }
            }

            uint32 money_per_player = uint32((pLoot->gold) / (playersNear.size()));

            for (std::vector<Player*>::const_iterator i = playersNear.begin(); i != playersNear.end(); ++i)
            {
                (*i)->ModifyMoney(money_per_player);

                WorldPacket data(SMSG_LOOT_MONEY_NOTIFY, 4);
                data << uint32(money_per_player);

                (*i)->GetSession()->SendPacket(&data);
            }
        }
        else
            { player->ModifyMoney(pLoot->gold); }

        // Used by Eluna
#ifdef ENABLE_ELUNA
        sEluna->OnLootMoney(player, pLoot->gold);
#endif /* ENABLE_ELUNA */

        pLoot->gold = 0;

        if (pItem)
            { pItem->SetLootState(ITEM_LOOT_CHANGED); }
    }
}

void WorldSession::HandleLootOpcode(WorldPacket& recv_data)
{
    DEBUG_LOG("WORLD: CMSG_LOOT");

    ObjectGuid guid;
    recv_data >> guid;

    // Check possible cheat
    if (!_player->IsAlive())
    {
        return;
    }

    GetPlayer()->SendLoot(guid, LOOT_CORPSE);
}

void WorldSession::HandleLootReleaseOpcode(WorldPacket& recv_data)
{
    DEBUG_LOG("WORLD: CMSG_LOOT_RELEASE");

    // cheaters can modify lguid to prevent correct apply loot release code and re-loot
    // use internal stored guid
    recv_data.read_skip<uint64>();                          // guid;

    if (ObjectGuid lootGuid = GetPlayer()->GetLootGuid())
        { DoLootRelease(lootGuid); }
}

void WorldSession::DoLootRelease(ObjectGuid lguid)
{
    Player*  player = GetPlayer();
    Loot*    loot;

    player->SetLootGuid(ObjectGuid());
    player->SendLootRelease(lguid);

    player->RemoveFlag(UNIT_FIELD_FLAGS, UNIT_FLAG_LOOTING);

    if (!player->IsInWorld())
        { return; }

    switch (lguid.GetHigh())
    {
        case HIGHGUID_GAMEOBJECT:
        {
            GameObject* go = GetPlayer()->GetMap()->GetGameObject(lguid);

            // not check distance for GO in case owned GO (fishing bobber case, for example) or Fishing hole GO
            if (!go || ((go->GetOwnerGuid() != _player->GetObjectGuid() && go->GetGoType() != GAMEOBJECT_TYPE_FISHINGHOLE) && !go->IsWithinDistInMap(_player, INTERACTION_DISTANCE)))
                { return; }

            loot = &go->loot;

            if (go->GetGoType() == GAMEOBJECT_TYPE_DOOR)
            {
                // locked doors are opened with spelleffect openlock, prevent remove its as looted
                go->UseDoorOrButton();
            }
            else if (loot->isLooted() || go->GetGoType() == GAMEOBJECT_TYPE_FISHINGNODE)
            {
                // GO is mineral vein? so it is not removed after its looted
                if (go->GetGoType() == GAMEOBJECT_TYPE_CHEST)
                {
                    uint32 go_min = go->GetGOInfo()->chest.minSuccessOpens;
                    uint32 go_max = go->GetGOInfo()->chest.maxSuccessOpens;

                    // only vein pass this check
                    if (go_min != 0 && go_max > go_min)
                    {
                        float amount_rate = sWorld.getConfig(CONFIG_FLOAT_RATE_MINING_AMOUNT);
                        float min_amount = go_min * amount_rate;
                        float max_amount = go_max * amount_rate;

                        go->AddUse();
                        float uses = float(go->GetUseCount());

                        if (uses < max_amount)
                        {
                            if (uses >= min_amount)
                            {
                                float chance_rate = sWorld.getConfig(CONFIG_FLOAT_RATE_MINING_NEXT);

                                int32 ReqValue = 175;
                                LockEntry const* lockInfo = sLockStore.LookupEntry(go->GetGOInfo()->chest.lockId);
                                if (lockInfo)
                                    { ReqValue = lockInfo->Skill[0]; }
                                float skill = float(player->GetSkillValue(SKILL_MINING)) / (ReqValue + 25);
                                double chance = pow(0.8 * chance_rate, 4 * (1 / double(max_amount)) * double(uses));
                                if (roll_chance_f(float(100.0f * chance + skill)))
                                {
                                    go->SetLootState(GO_READY);
                                }
                                else                        // not have more uses
                                    { go->SetLootState(GO_JUST_DEACTIVATED); }
                            }
                            else                            // 100% chance until min uses
                                { go->SetLootState(GO_READY); }
                        }
                        else                                // max uses already
                            { go->SetLootState(GO_JUST_DEACTIVATED); }
                    }
                    else                                    // not vein
                        { go->SetLootState(GO_JUST_DEACTIVATED); }
                }
                else if (go->GetGoType() == GAMEOBJECT_TYPE_FISHINGHOLE)
                {
                    // The fishing hole used once more
                    go->AddUse();                           // if the max usage is reached, will be despawned at next tick
                    if (go->GetUseCount() >= urand(go->GetGOInfo()->fishinghole.minSuccessOpens, go->GetGOInfo()->fishinghole.maxSuccessOpens))
                    {
                        go->SetLootState(GO_JUST_DEACTIVATED);
                    }
                    else
                        { go->SetLootState(GO_READY); }
                }
                else // not chest (or vein/herb/etc)
                    { go->SetLootState(GO_JUST_DEACTIVATED); }

                loot->clear();
            }
            else
                // not fully looted object
            { 
                go->SetLootState(GO_ACTIVATED); 
            }

            go->SetGoState(GO_STATE_READY);

            break;
        }
        /* Only used for removing insignia in battlegrounds */
        case HIGHGUID_CORPSE:
        {
            /* Get pointer to corpse */
            Corpse* corpse = _player->GetMap()->GetCorpse(lguid);

            /* If corpse is invalid or not in a valid position, dont allow looting */
            if (!corpse || !corpse->IsWithinDistInMap(_player, INTERACTION_DISTANCE))
            {
                return;
            }

            loot = &corpse->loot;

            if (loot->isLooted())
            {
                loot->clear();
                corpse->RemoveFlag(CORPSE_FIELD_DYNAMIC_FLAGS, CORPSE_DYNFLAG_LOOTABLE);
            }
            break;
        }
        case HIGHGUID_ITEM:
        {
            Item* pItem = player->GetItemByGuid(lguid);
            if (!pItem)
                { return; }

            switch (pItem->loot.loot_type)
            {
                    // temporary loot, auto loot move
                case LOOT_DISENCHANTING:
                {
                    if (!pItem->loot.isLooted())
                        { player->AutoStoreLoot(pItem->loot); } // can be lost if no space
                    pItem->loot.clear();
                    pItem->SetLootState(ITEM_LOOT_REMOVED);
                    player->DestroyItem(pItem->GetBagSlot(), pItem->GetSlot(), true);
                    break;
                }
                // normal persistence loot
                default:
                {
                    // must be destroyed only if no loot
                    if (pItem->loot.isLooted())
                    {
                        pItem->SetLootState(ITEM_LOOT_REMOVED);
                        player->DestroyItem(pItem->GetBagSlot(), pItem->GetSlot(), true);
                    }
                    break;
                }
            }
            return;                                         // item can be looted only single player
        }
        case HIGHGUID_UNIT:
        {
            /* Get creature pointer */
            Creature* pCreature = GetPlayer()->GetMap()->GetCreature(lguid);

            bool ok_loot = (pCreature && // The creature exists (we dont have a null pointer)
                            pCreature->IsAlive() == // Creature is alive and we're a rogue and creature can be pickpocketed
                            (player->getClass() == CLASS_ROGUE && pCreature->lootForPickPocketed));
            if (!ok_loot || !pCreature->IsWithinDistInMap(_player, INTERACTION_DISTANCE))
                { return; }

            /* Copy creature loot to loot variable */
            loot = &pCreature->loot;

            /* Update for other players. */
            if(!loot->isLooted())
            { 
                Group const* group = pCreature->GetGroupLootRecipient();
                if (group && !pCreature->hasBeenLootedOnce)
                {
                    // Checking whether it has been looted once by the designed looter (master loot case).
                    switch (group->GetLootMethod())
                    {
                        case FREE_FOR_ALL:
                        case NEED_BEFORE_GREED:
                        case ROUND_ROBIN:
                        case GROUP_LOOT:
                        {
                            pCreature->hasBeenLootedOnce = true;
                            break;
                        }
                        case MASTER_LOOT:
                        {
                            pCreature->hasBeenLootedOnce = (group->GetLooterGuid() == player->GetObjectGuid());
                            break;
                        }

                    }
                    pCreature->MarkFlagUpdateForClient(UNIT_DYNAMIC_FLAGS);
                }
            }            

            /* We've completely looted the creature, mark it as available for skinning */
            if (loot->isLooted() && !pCreature->IsAlive())
            {
                /* Update Creature: for example skinning after normal loot */
                pCreature->PrepareBodyLootState();
                pCreature->AllLootRemovedFromCorpse();
            }
            break;
        }
        default:
        {
            sLog.outError("%s is unsupported for looting.", lguid.GetString().c_str());
            return;
        }
    }

    // Player is not looking at loot list, he doesn't need to see updates on the loot list
    loot->RemoveLooter(player->GetObjectGuid());
}

void WorldSession::HandleLootMasterGiveOpcode(WorldPacket& recv_data)
{
    uint8 slotid;
    ObjectGuid lootguid;
    ObjectGuid target_playerguid;

    recv_data >> lootguid >> slotid >> target_playerguid;

    if (!_player->GetGroup() || _player->GetGroup()->GetLooterGuid() != _player->GetObjectGuid())
    {
        _player->SendLootRelease(GetPlayer()->GetLootGuid());
        return;
    }

    Player* target = ObjectAccessor::FindPlayer(target_playerguid);
    if (!target)
        { return; }

    DEBUG_LOG("WorldSession::HandleLootMasterGiveOpcode (CMSG_LOOT_MASTER_GIVE, 0x02A3) Target = %s [%s].", target_playerguid.GetString().c_str(), target->GetName());

    if (_player->GetLootGuid() != lootguid)
        { return; }

    Loot* pLoot = NULL;

    if (lootguid.IsCreature())
    {
        Creature* pCreature = GetPlayer()->GetMap()->GetCreature(lootguid);
        if (!pCreature)
            { return; }

        pLoot = &pCreature->loot;
    }
    else if (lootguid.IsGameObject())
    {
        GameObject* pGO = GetPlayer()->GetMap()->GetGameObject(lootguid);
        if (!pGO)
            { return; }

        pLoot = &pGO->loot;
    }
    else
        { return; }

    if (slotid > pLoot->items.size())
    {
        DEBUG_LOG("AutoLootItem: Player %s might be using a hack! (slot %d, size " SIZEFMTD ")", GetPlayer()->GetName(), slotid, pLoot->items.size());
        return;
    }

    LootItem& item = pLoot->items[slotid];

    ItemPosCountVec dest;
    InventoryResult msg = target->CanStoreNewItem(NULL_BAG, NULL_SLOT, dest, item.itemid, item.count);
    if (msg != EQUIP_ERR_OK)
    {
        // Assign winner to the item, avoiding other member picks it up.
        item.winner = target->GetObjectGuid();
        target->SendEquipError(msg, NULL, NULL, item.itemid);

        pLoot->NotifyItemRemoved(slotid);

        return;
    }

    // now move item from loot to target inventory
    Item* newitem = target->StoreNewItem(dest, item.itemid, true, item.randomPropertyId);
    target->SendNewItem(newitem, uint32(item.count), false, false, true);

    // Used by Eluna
#ifdef ENABLE_ELUNA
    sEluna->OnLootItem(target, newitem, item.count, lootguid);
#endif /* ENABLE_ELUNA */

    // mark as looted
    item.count = 0;
    item.is_looted = true;

    pLoot->NotifyItemRemoved(slotid);
    --pLoot->unlootedCount;
}