path: root/src/server/game/Handlers/SpellHandler.cpp

/*
 * This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#include "WorldSession.h"
#include "CollectionMgr.h"
#include "Common.h"
#include "DatabaseEnv.h"
#include "DB2Stores.h"
#include "GameObjectAI.h"
#include "GameObjectPackets.h"
#include "Guild.h"
#include "GuildMgr.h"
#include "Item.h"
#include "Log.h"
#include "Loot.h"
#include "LootItemStorage.h"
#include "LootMgr.h"
#include "Map.h"
#include "Player.h"
#include "ObjectAccessor.h"
#include "ObjectMgr.h"
#include "ScriptMgr.h"
#include "Spell.h"
#include "SpellAuraEffects.h"
#include "SpellCastRequest.h"
#include "SpellMgr.h"
#include "SpellPackets.h"
#include "TemporarySummon.h"
#include "TotemPackets.h"
#include "World.h"

void WorldSession::HandleUseItemOpcode(WorldPackets::Spells::UseItem& packet)
{
    // ignore for remote control state
    if (_player->GetUnitBeingMoved() != _player)
        return;

    // Skip casting invalid spells right away
    SpellInfo const* spellInfo = sSpellMgr->GetSpellInfo(packet.Cast.SpellID, _player->GetMap()->GetDifficultyID());
    if (!spellInfo)
    {
        TC_LOG_ERROR("network", "WorldSession::HandleUseItemOpcode: attempted to cast a non-existing spell (Id: {})", packet.Cast.SpellID);
        return;
    }

    if (_player->CanRequestSpellCast(spellInfo, _player))
        _player->RequestSpellCast(std::make_unique<SpellCastRequest>(std::move(packet.Cast), _player->GetGUID(), SpellCastRequestItemData(packet.PackSlot, packet.Slot, packet.CastItem)));
    else
        Spell::SendCastResult(_player, spellInfo, {}, packet.Cast.CastID, SPELL_FAILED_SPELL_IN_PROGRESS);
}

void WorldSession::HandleOpenItemOpcode(WorldPackets::Spells::OpenItem& packet)
{
    Player* player = GetPlayer();

    // ignore for remote control state
    if (player->GetUnitBeingMoved() != player)
        return;
    TC_LOG_INFO("network", "bagIndex: {}, slot: {}", packet.Slot, packet.PackSlot);

    // additional check, client outputs message on its own
    if (!player->IsAlive())
    {
        player->SendEquipError(EQUIP_ERR_PLAYER_DEAD, nullptr, nullptr);
        return;
    }

    Item* item = player->GetItemByPos(packet.Slot, packet.PackSlot);
    if (!item)
    {
        player->SendEquipError(EQUIP_ERR_ITEM_NOT_FOUND, nullptr, nullptr);
        return;
    }

    ItemTemplate const* proto = item->GetTemplate();
    if (!proto)
    {
        player->SendEquipError(EQUIP_ERR_ITEM_NOT_FOUND, item, nullptr);
        return;
    }

    // Verify that the bag is an actual bag or wrapped item that can be used "normally"
    if (!proto->HasFlag(ITEM_FLAG_HAS_LOOT) && !item->IsWrapped())
    {
        player->SendEquipError(EQUIP_ERR_CLIENT_LOCKED_OUT, item, nullptr);
        TC_LOG_ERROR("entities.player.cheat", "Possible hacking attempt: Player {} {} tried to open item [{}, entry: {}] which is not openable!",
            player->GetName(), player->GetGUID().ToString(), item->GetGUID().ToString(), proto->GetId());
        return;
    }

    // locked item
    uint32 lockId = proto->GetLockID();
    if (lockId)
    {
        LockEntry const* lockInfo = sLockStore.LookupEntry(lockId);

        if (!lockInfo)
        {
            player->SendEquipError(EQUIP_ERR_ITEM_LOCKED, item, nullptr);
            TC_LOG_ERROR("network", "WORLD::OpenItem: item {} has an unknown lockId: {}!", item->GetGUID().ToString(), lockId);
            return;
        }

        // was not unlocked yet
        if (item->IsLocked())
        {
            player->SendEquipError(EQUIP_ERR_ITEM_LOCKED, item, nullptr);
            return;
        }
    }

    if (item->IsWrapped())
    {
        CharacterDatabasePreparedStatement* stmt = CharacterDatabase.GetPreparedStatement(CHAR_SEL_CHARACTER_GIFT_BY_ITEM);
        stmt->setUInt64(0, item->GetGUID().GetCounter());
        _queryProcessor.AddCallback(CharacterDatabase.AsyncQuery(stmt)
            .WithPreparedCallback([this, pos = item->GetPos(), itemGuid = item->GetGUID()](PreparedQueryResult result)
            {
                HandleOpenWrappedItemCallback(pos, itemGuid, std::move(result));
            }));
    }
    else
    {
        // If item doesn't already have loot, attempt to load it. If that
        // fails then this is first time opening, generate loot
        if (!item->m_lootGenerated && !sLootItemStorage->LoadStoredLoot(item, player))
        {
            Loot* loot = new Loot(player->GetMap(), item->GetGUID(), LOOT_ITEM, nullptr);
            item->m_loot.reset(loot);
            item->m_lootGenerated = true;
            loot->generateMoneyLoot(item->GetTemplate()->MinMoneyLoot, item->GetTemplate()->MaxMoneyLoot);
            loot->FillLoot(item->GetEntry(), LootTemplates_Item, player, true, loot->gold != 0);

            // Force save the loot and money items that were just rolled
            //  Also saves the container item ID in Loot struct (not to DB)
            if (loot->gold > 0 || loot->unlootedCount > 0)
                sLootItemStorage->AddNewStoredLoot(item->GetGUID().GetCounter(), loot, player);
        }
        if (item->m_loot)
            player->SendLoot(*item->m_loot);
        else
            player->SendLootError(ObjectGuid::Empty, item->GetGUID(), LOOT_ERROR_NO_LOOT);
    }
}

void WorldSession::HandleOpenWrappedItemCallback(uint16 pos, ObjectGuid itemGuid, PreparedQueryResult result)
{
    if (!GetPlayer())
        return;

    Item* item = GetPlayer()->GetItemByPos(pos);
    if (!item)
        return;

    if (item->GetGUID() != itemGuid || !item->IsWrapped()) // during getting result, gift was swapped with another item
        return;

    if (!result)
    {
        TC_LOG_ERROR("network", "Wrapped item {} does't have record in character_gifts table and will deleted", item->GetGUID().ToString());
        GetPlayer()->DestroyItem(item->GetBagSlot(), item->GetSlot(), true);
        return;
    }

    CharacterDatabaseTransaction trans = CharacterDatabase.BeginTransaction();

    Field* fields = result->Fetch();
    uint32 entry = fields[0].GetUInt32();
    uint32 flags = fields[1].GetUInt32();

    item->SetGiftCreator(ObjectGuid::Empty);
    item->SetEntry(entry);
    item->ReplaceAllItemFlags(ItemFieldFlags(flags));
    item->SetMaxDurability(item->GetTemplate()->MaxDurability);
    item->SetState(ITEM_CHANGED, GetPlayer());

    GetPlayer()->SaveInventoryAndGoldToDB(trans);

    CharacterDatabasePreparedStatement* stmt = CharacterDatabase.GetPreparedStatement(CHAR_DEL_GIFT);
    stmt->setUInt64(0, itemGuid.GetCounter());
    trans->Append(stmt);

    CharacterDatabase.CommitTransaction(trans);
}

void WorldSession::HandleGameObjectUseOpcode(WorldPackets::GameObject::GameObjUse& packet)
{
    if (GameObject* obj = GetPlayer()->GetGameObjectIfCanInteractWith(packet.Guid))
    {
        // ignore for remote control state
        if (GetPlayer()->GetUnitBeingMoved() != GetPlayer())
            if (!(GetPlayer()->IsOnVehicle(GetPlayer()->GetUnitBeingMoved()) || GetPlayer()->IsMounted()) && !obj->GetGOInfo()->IsUsableMounted())
                return;

        obj->Use(GetPlayer());
    }
}

void WorldSession::HandleGameobjectReportUse(WorldPackets::GameObject::GameObjReportUse& packet)
{
    // ignore for remote control state
    if (_player->GetUnitBeingMoved() != _player)
        return;

    if (GameObject* go = GetPlayer()->GetGameObjectIfCanInteractWith(packet.Guid))
    {
        if (go->AI()->OnReportUse(_player))
            return;

        _player->UpdateCriteria(CriteriaType::UseGameobject, go->GetEntry());
    }
}

void WorldSession::HandleCastSpellOpcode(WorldPackets::Spells::CastSpell& cast)
{
    // Skip casting invalid spells right away
    SpellInfo const* spellInfo = sSpellMgr->GetSpellInfo(cast.Cast.SpellID, _player->GetMap()->GetDifficultyID());
    if (!spellInfo)
    {
        TC_LOG_ERROR("network", "WorldSession::HandleCastSpellOpcode: attempted to cast a non-existing spell (Id: {})", cast.Cast.SpellID);
        return;
    }

    // ignore for remote control state (for player case)
    Unit* mover = _player->GetUnitBeingMoved();
    if (mover != _player && mover->GetTypeId() == TYPEID_PLAYER)
        return;

    Unit* castingUnit = mover;
    if (castingUnit->IsCreature() && !castingUnit->ToCreature()->HasSpell(spellInfo->Id))
    {
        // If the vehicle creature does not have the spell but it allows the passenger to cast own spells
        // change caster to player and let him cast
        if (!_player->IsOnVehicle(castingUnit) || spellInfo->CheckVehicle(_player) != SPELL_CAST_OK)
            return;

        castingUnit = _player;
    }

    if (cast.Cast.MoveUpdate.has_value())
        HandleMovementOpcode(CMSG_MOVE_STOP, *cast.Cast.MoveUpdate);

    if (_player->CanRequestSpellCast(spellInfo, castingUnit))
        _player->RequestSpellCast(std::make_unique<SpellCastRequest>(std::move(cast.Cast), castingUnit->GetGUID()));
    else
        Spell::SendCastResult(_player, spellInfo, {}, cast.Cast.CastID, SPELL_FAILED_SPELL_IN_PROGRESS);
}

void WorldSession::HandleCancelCastOpcode(WorldPackets::Spells::CancelCast& packet)
{
    if (_player->IsNonMeleeSpellCast(false))
    {
        _player->InterruptNonMeleeSpells(false, packet.SpellID, false);
        _player->CancelPendingCastRequest(); // canceling casts also cancels pending spell cast requests
    }
}

void WorldSession::HandleCancelAuraOpcode(WorldPackets::Spells::CancelAura& cancelAura)
{
    SpellInfo const* spellInfo = sSpellMgr->GetSpellInfo(cancelAura.SpellID, _player->GetMap()->GetDifficultyID());
    if (!spellInfo)
        return;

    // not allow remove spells with attr SPELL_ATTR0_CANT_CANCEL
    if (spellInfo->HasAttribute(SPELL_ATTR0_NO_AURA_CANCEL))
        return;

    // channeled spell case (it currently cast then)
    if (spellInfo->IsChanneled())
    {
        if (Spell* curSpell = _player->GetCurrentSpell(CURRENT_CHANNELED_SPELL))
            if (curSpell->GetSpellInfo()->Id == uint32(cancelAura.SpellID))
                _player->InterruptSpell(CURRENT_CHANNELED_SPELL);
        return;
    }

    // non channeled case:
    // don't allow remove non positive spells
    // don't allow cancelling passive auras (some of them are visible)
    if (!spellInfo->IsPositive() || spellInfo->IsPassive())
        return;

    _player->RemoveOwnedAura(cancelAura.SpellID, cancelAura.CasterGUID, 0, AURA_REMOVE_BY_CANCEL);
}

void WorldSession::HandlePetCancelAuraOpcode(WorldPackets::Spells::PetCancelAura& packet)
{
    if (!sSpellMgr->GetSpellInfo(packet.SpellID, DIFFICULTY_NONE))
    {
        TC_LOG_ERROR("network", "WORLD: unknown PET spell id {}", packet.SpellID);
        return;
    }

    Creature* pet = ObjectAccessor::GetCreatureOrPetOrVehicle(*_player, packet.PetGUID);

    if (!pet)
    {
        TC_LOG_ERROR("network", "HandlePetCancelAura: Attempt to cancel an aura for non-existant {} by player '{}'", packet.PetGUID.ToString(), GetPlayer()->GetName());
        return;
    }

    if (pet != GetPlayer()->GetGuardianPet() && pet != GetPlayer()->GetCharmed())
    {
        TC_LOG_ERROR("network", "HandlePetCancelAura: {} is not a pet of player '{}'", packet.PetGUID.ToString(), GetPlayer()->GetName());
        return;
    }

    if (!pet->IsAlive())
    {
        pet->SendPetActionFeedback(PetActionFeedback::Dead, 0);
        return;
    }

    pet->RemoveOwnedAura(packet.SpellID, ObjectGuid::Empty, 0, AURA_REMOVE_BY_CANCEL);
}

void WorldSession::HandleCancelGrowthAuraOpcode(WorldPackets::Spells::CancelGrowthAura& /*cancelGrowthAura*/)
{
    _player->RemoveAurasByType(SPELL_AURA_MOD_SCALE, [](AuraApplication const* aurApp)
    {
        SpellInfo const* spellInfo = aurApp->GetBase()->GetSpellInfo();
        return !spellInfo->HasAttribute(SPELL_ATTR0_NO_AURA_CANCEL) && spellInfo->IsPositive() && !spellInfo->IsPassive();
    });
}

void WorldSession::HandleCancelMountAuraOpcode(WorldPackets::Spells::CancelMountAura& /*cancelMountAura*/)
{
    _player->RemoveAurasByType(SPELL_AURA_MOUNTED, [](AuraApplication const* aurApp)
    {
        SpellInfo const* spellInfo = aurApp->GetBase()->GetSpellInfo();
        return !spellInfo->HasAttribute(SPELL_ATTR0_NO_AURA_CANCEL) && spellInfo->IsPositive() && !spellInfo->IsPassive();
    });
}

void WorldSession::HandleCancelAutoRepeatSpellOpcode(WorldPackets::Spells::CancelAutoRepeatSpell& /*cancelAutoRepeatSpell*/)
{
    // may be better send SMSG_CANCEL_AUTO_REPEAT?
    // cancel and prepare for deleting
    _player->InterruptSpell(CURRENT_AUTOREPEAT_SPELL);
}

void WorldSession::HandleCancelQueuedSpellOpcode(WorldPackets::Spells::CancelQueuedSpell& /*cancelQueuedSpell*/)
{
    _player->CancelPendingCastRequest();
}

void WorldSession::HandleCancelChanneling(WorldPackets::Spells::CancelChannelling& cancelChanneling)
{
    // ignore for remote control state (for player case)
    Unit* mover = _player->GetUnitBeingMoved();
    if (mover != _player && mover->GetTypeId() == TYPEID_PLAYER)
        return;

    SpellInfo const* spellInfo = sSpellMgr->GetSpellInfo(cancelChanneling.ChannelSpell, mover->GetMap()->GetDifficultyID());
    if (!spellInfo)
        return;

    // not allow remove spells with attr SPELL_ATTR0_CANT_CANCEL
    if (spellInfo->HasAttribute(SPELL_ATTR0_NO_AURA_CANCEL))
        return;

    Spell* spell = mover->GetCurrentSpell(CURRENT_CHANNELED_SPELL);
    if (!spell || spell->GetSpellInfo()->Id != spellInfo->Id)
        return;

    mover->InterruptSpell(CURRENT_CHANNELED_SPELL);
}

void WorldSession::HandleTotemDestroyed(WorldPackets::Totem::TotemDestroyed& totemDestroyed)
{
    // ignore for remote control state
    if (_player->GetUnitBeingMoved() != _player)
        return;

    uint8 slotId = totemDestroyed.Slot;
    slotId += SUMMON_SLOT_TOTEM;

    if (slotId >= MAX_TOTEM_SLOT)
        return;

    if (!_player->m_SummonSlot[slotId])
        return;

    Creature* totem = ObjectAccessor::GetCreature(*_player, _player->m_SummonSlot[slotId]);
    if (totem && totem->IsTotem() && (totemDestroyed.TotemGUID.IsEmpty() || totem->GetGUID() == totemDestroyed.TotemGUID))
        totem->DespawnOrUnsummon();
}

void WorldSession::HandleSelfResOpcode(WorldPackets::Spells::SelfRes& selfRes)
{
    if (_player->m_activePlayerData->SelfResSpells.FindIndex(selfRes.SpellID) < 0)
        return;

    SpellInfo const* spellInfo = sSpellMgr->GetSpellInfo(selfRes.SpellID, _player->GetMap()->GetDifficultyID());
    if (!spellInfo)
        return;

    if (_player->HasAuraType(SPELL_AURA_PREVENT_RESURRECTION) && !spellInfo->HasAttribute(SPELL_ATTR7_BYPASS_NO_RESURRECT_AURA))
        return; // silent return, client should display error by itself and not send this opcode

    _player->CastSpell(_player, selfRes.SpellID, _player->GetMap()->GetDifficultyID());
    _player->RemoveSelfResSpell(selfRes.SpellID);
}

void WorldSession::HandleSpellClick(WorldPackets::Spells::SpellClick& spellClick)
{
    // this will get something not in world. crash
    Creature* unit = ObjectAccessor::GetCreatureOrPetOrVehicle(*_player, spellClick.SpellClickUnitGuid);

    if (!unit)
        return;

    /// @todo Unit::SetCharmedBy: 28782 is not in world but 0 is trying to charm it! -> crash
    if (!unit->IsInWorld())
        return;

    unit->HandleSpellClick(_player);
}

void WorldSession::HandleMirrorImageDataRequest(WorldPackets::Spells::GetMirrorImageData& getMirrorImageData)
{
    ObjectGuid guid = getMirrorImageData.UnitGUID;

    // Get unit for which data is needed by client
    Unit* unit = ObjectAccessor::GetUnit(*_player, guid);
    if (!unit)
        return;

    if (!unit->HasAuraType(SPELL_AURA_CLONE_CASTER))
        return;

    // Get creator of the unit (SPELL_AURA_CLONE_CASTER does not stack)
    Unit* creator = unit->GetAuraEffectsByType(SPELL_AURA_CLONE_CASTER).front()->GetCaster();
    if (!creator)
        return;

    if (Player* player = creator->ToPlayer())
    {
        WorldPackets::Spells::MirrorImageComponentedData mirrorImageComponentedData;
        mirrorImageComponentedData.UnitGUID = guid;
        mirrorImageComponentedData.DisplayID = creator->GetDisplayId();
        mirrorImageComponentedData.RaceID = creator->GetRace();
        mirrorImageComponentedData.Gender = creator->GetGender();
        mirrorImageComponentedData.ClassID = creator->GetClass();

        for (UF::ChrCustomizationChoice const& customization : player->m_playerData->Customizations)
            mirrorImageComponentedData.Customizations.push_back(customization);

        Guild* guild = player->GetGuild();
        mirrorImageComponentedData.GuildGUID = (guild ? guild->GetGUID() : ObjectGuid::Empty);

        mirrorImageComponentedData.ItemDisplayID.reserve(11);

        static EquipmentSlots const itemSlots[] =
        {
            EQUIPMENT_SLOT_HEAD,
            EQUIPMENT_SLOT_SHOULDERS,
            EQUIPMENT_SLOT_BODY,
            EQUIPMENT_SLOT_CHEST,
            EQUIPMENT_SLOT_WAIST,
            EQUIPMENT_SLOT_LEGS,
            EQUIPMENT_SLOT_FEET,
            EQUIPMENT_SLOT_WRISTS,
            EQUIPMENT_SLOT_HANDS,
            EQUIPMENT_SLOT_TABARD,
            EQUIPMENT_SLOT_BACK,
        };

        // Display items in visible slots
        for (EquipmentSlots slot : itemSlots)
        {
            uint32 itemDisplayId;
            if (Item const* item = player->GetItemByPos(INVENTORY_SLOT_BAG_0, slot))
                itemDisplayId = item->GetDisplayId(player);
            else
                itemDisplayId = 0;

            mirrorImageComponentedData.ItemDisplayID.push_back(itemDisplayId);
        }
        SendPacket(mirrorImageComponentedData.Write());
    }
    else
    {
        WorldPackets::Spells::MirrorImageCreatureData mirrorImageCreatureData;
        mirrorImageCreatureData.UnitGUID = guid;
        mirrorImageCreatureData.DisplayID = creator->GetDisplayId();
        SendPacket(mirrorImageCreatureData.Write());
    }
}

void WorldSession::HandleMissileTrajectoryCollision(WorldPackets::Spells::MissileTrajectoryCollision& packet)
{
    Unit* caster = ObjectAccessor::GetUnit(*_player, packet.Target);
    if (!caster)
        return;

    Spell* spell = caster->FindCurrentSpellBySpellId(packet.SpellID);
    if (!spell || !spell->m_targets.HasDst())
        return;

    Position pos = *spell->m_targets.GetDstPos();
    pos.Relocate(packet.CollisionPos);
    spell->m_targets.ModDst(pos);

    // we changed dest, recalculate flight time
    spell->RecalculateDelayMomentForDst();

    WorldPackets::Spells::NotifyMissileTrajectoryCollision notify;
    notify.Caster = packet.Target;
    notify.CastID = packet.CastID;
    notify.CollisionPos = packet.CollisionPos;
    caster->SendMessageToSet(notify.Write(), true);
}

void WorldSession::HandleUpdateMissileTrajectory(WorldPackets::Spells::UpdateMissileTrajectory& packet)
{
    Unit* caster = ObjectAccessor::GetUnit(*_player, packet.Guid);
    Spell* spell = caster ? caster->GetCurrentSpell(CURRENT_GENERIC_SPELL) : nullptr;
    if (!spell || spell->m_spellInfo->Id != uint32(packet.SpellID) || spell->m_castId != packet.CastID || !spell->m_targets.HasDst() || !spell->m_targets.HasSrc())
        return;

    spell->m_targets.ModSrc(packet.FirePos);
    spell->m_targets.ModDst(packet.ImpactPos);
    spell->m_targets.SetPitch(packet.Pitch);
    spell->m_targets.SetSpeed(packet.Speed);

    if (packet.Status)
        HandleMovementOpcode(CMSG_MOVE_STOP, *packet.Status);
}

void WorldSession::HandleKeyboundOverride(WorldPackets::Spells::KeyboundOverride& keyboundOverride)
{
    Player* player = GetPlayer();
    if (!player->HasAuraTypeWithMiscvalue(SPELL_AURA_KEYBOUND_OVERRIDE, keyboundOverride.OverrideID))
        return;

    SpellKeyboundOverrideEntry const* spellKeyboundOverride = sSpellKeyboundOverrideStore.LookupEntry(keyboundOverride.OverrideID);
    if (!spellKeyboundOverride)
        return;

    player->CastSpell(player, spellKeyboundOverride->Data);
}