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[gemrb.git] / gemrb / core / Inventory.cpp

/* GemRB - Infinity Engine Emulator
 * Copyright (C) 2003 The GemRB Project
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 *
 */

//This class represents the inventory of stores (.sto), area containers (.are)
//or actors (.cre).

#include "Inventory.h"

#include "win32def.h"
#include "strrefs.h"

#include "Actor.h"
#include "Game.h"
#include "GameData.h"
#include "Interface.h"
#include "Item.h"
#include "ScriptEngine.h"

#include <cstdio>

static int SLOT_HEAD = -1;
static int SLOT_MAGIC = -1;
static int SLOT_FIST = -1;
static int SLOT_MELEE = -1;
static int LAST_MELEE = -1;
static int SLOT_RANGED = -1;
static int LAST_RANGED = -1;
static int SLOT_QUICK = -1;
static int LAST_QUICK = -1;
static int SLOT_INV = -1;
static int LAST_INV = -1;
static int SLOT_LEFT = -1;

//IWD2 style slots
static bool IWD2 = false;
static int MagicBit = 0;

static void InvalidSlot(int slot)
{
        printMessage("Inventory"," ",LIGHT_RED);
        printf("Invalid slot: %d!\n",slot);
        abort();
}

//This inline function returns both an item pointer and the slot data.
//slot is a dynamic slot number (SLOT_*)
inline Item *Inventory::GetItemPointer(ieDword slot, CREItem *&item) const
{
        item = GetSlotItem(slot);
        if (!item) return NULL;
        if (!item->ItemResRef[0]) return NULL;
        return gamedata->GetItem(item->ItemResRef);
}

void Inventory::Init(int mb)
{
        SLOT_MAGIC=-1;
        SLOT_FIST=-1;
        SLOT_MELEE=-1;
        LAST_MELEE=-1;
        SLOT_RANGED=-1;
        LAST_RANGED=-1;
        SLOT_QUICK=-1;
        LAST_QUICK=-1;
        SLOT_LEFT=-1;
        //TODO: set this correctly
        IWD2 = false;
        MagicBit = mb;
}

Inventory::Inventory()
{
        Owner = NULL;
        InventoryType = INVENTORY_HEAP;
        Changed = false;
        Weight = 0;
        Equipped = IW_NO_EQUIPPED;
        EquippedHeader = 0;
        ItemExcl = 0;
}

Inventory::~Inventory()
{
        for (size_t i = 0; i < Slots.size(); i++) {
                if (Slots[i]) {
                        delete( Slots[i] );
                        Slots[i] = NULL;
                }
        }
}

CREItem *Inventory::GetItem(unsigned int slot)
{
        if (slot >= Slots.size() ) {
                InvalidSlot(slot);
                return NULL;
        }
        CREItem *item = Slots[slot];
        Slots.erase(Slots.begin()+slot);
        return item;
}

void Inventory::AddItem(CREItem *item)
{
        if (!item) return; //invalid items get no slot
        Slots.push_back(item);
        //Changed=true; //probably not needed, chests got no encumbrance
}

void Inventory::CalculateWeight()
{
        if (!Changed) {
                return;
        }
        Weight = 0;
        for (size_t i = 0; i < Slots.size(); i++) {
                CREItem *slot = Slots[i];
                if (!slot) {
                        continue;
                }
                //printf ("%2d: %8s : %d x %d\n", (int) i, slot->ItemResRef, slot->Weight, slot->Usages[0]);
                if (slot->Weight == -1) {
                        Item *itm = gamedata->GetItem( slot->ItemResRef );
                        if (itm) {
                                //simply adding the item flags to the slot
                                slot->Flags |= (itm->Flags<<8);
                                //some slot flags might be affected by the item flags
                                if (!(slot->Flags & IE_INV_ITEM_CRITICAL)) {
                                        slot->Flags |= IE_INV_ITEM_DESTRUCTIBLE;
                                }
                                //this is for converting IWD items magic flag
                                if (MagicBit) {
                                        if (slot->Flags&IE_INV_ITEM_UNDROPPABLE) {
                                                slot->Flags|=IE_INV_ITEM_MAGICAL;
                                                slot->Flags&=~IE_INV_ITEM_UNDROPPABLE;
                                        }
                                }

                                if (!(slot->Flags & IE_INV_ITEM_MOVABLE)) {
                                        slot->Flags |= IE_INV_ITEM_UNDROPPABLE;
                                }

                                if (slot->Flags & IE_INV_ITEM_STOLEN2) {
                                        slot->Flags |= IE_INV_ITEM_STOLEN;
                                }

                                //auto identify basic items
                                if (!itm->LoreToID) {
                                        slot->Flags |= IE_INV_ITEM_IDENTIFIED;
                                }

                                //if item is stacked mark it as so
                                if (itm->StackAmount) {
                                        slot->Flags |= IE_INV_ITEM_STACKED;
                                }

                                slot->Weight = itm->Weight;
                                slot->StackAmount = itm->StackAmount;
                                gamedata->FreeItem( itm, slot->ItemResRef, false );
                        }
                        else {
                                printMessage( "Inventory", " ", LIGHT_RED);
                                printf("Invalid item: %s!\n", slot->ItemResRef);
                                slot->Weight = 0;
                        }
                } else {
                        slot->Flags &= ~IE_INV_ITEM_ACQUIRED;
                }
                if (slot->Weight > 0) {
                        Weight += slot->Weight * ((slot->Usages[0] && slot->StackAmount > 1) ? slot->Usages[0] : 1);
                }
        }
        Changed = false;
}

void Inventory::AddSlotEffects(ieDword index)
{
        CREItem* slot;

        const Item *itm = GetItemPointer(index, slot);
        if (!itm) {
                printMessage("Inventory","Invalid item equipped...\n",LIGHT_RED);
                return;
        }
        ItemExcl|=itm->ItemExcl;

        ieWord gradient = itm->GetWieldedGradient();
        if (gradient!=0xffff) {
                Owner->SetBase(IE_COLORS, gradient);
        }

        //get the equipping effects
        EffectQueue *eqfx = itm->GetEffectBlock(-1, index, 0);
        gamedata->FreeItem( itm, slot->ItemResRef, false );

        Owner->RefreshEffects(eqfx);
        //call gui for possible paperdoll animation changes
        if (Owner->InParty) {
                core->SetEventFlag(EF_UPDATEANIM);
        }
}

//no need to know the item effects 'personally', the equipping slot
//is stored in them
void Inventory::RemoveSlotEffects(ieDword index)
{
        Owner->fxqueue.RemoveEquippingEffects(index);
        Owner->RefreshEffects(NULL);
        //call gui for possible paperdoll animation changes
        if (Owner->InParty) {
                core->SetEventFlag(EF_UPDATEANIM);
        }
}

void Inventory::SetInventoryType(int arg)
{
        InventoryType = arg;
}

void Inventory::SetSlotCount(unsigned int size)
{
        if (Slots.size()) {
                printf("Inventory size changed???\n");
                //we don't allow reassignment,
                //if you want this, delete the previous Slots here
                abort();
        }
        Slots.assign((size_t) size, NULL);
}

/** if you supply a "" string, then it checks if the slot is empty */
bool Inventory::HasItemInSlot(const char *resref, unsigned int slot) const
{
        if (slot >= Slots.size()) {
                return false;
        }
        const CREItem *item = Slots[slot];
        if (!item) {
                return false;
        }
        if (!resref[0]) {
                return true;
        }
        if (strnicmp( item->ItemResRef, resref, 8 )==0) {
                return true;
        }
        return false;
}

/** counts the items in the inventory, if stacks == 1 then stacks are
                accounted for their heap size */
int Inventory::CountItems(const char *resref, bool stacks) const
{
        int count = 0;
        size_t slot = Slots.size();
        while(slot--) {
                const CREItem *item = Slots[slot];
                if (!item) {
                        continue;
                }
                if (resref && resref[0]) {
                        if (!strnicmp(resref, item->ItemResRef, 8) )
                                continue;
                }
                if (stacks && (item->Flags&IE_INV_ITEM_STACKED) ) {
                        count+=item->Usages[0];
                }
                else {
                        count++;
                }
        }
        return count;
}

/** this function can look for stolen, equipped, identified, destructible
                etc, items. You just have to specify the flags in the bitmask
                specifying 1 in a bit signifies a requirement */
bool Inventory::HasItem(const char *resref, ieDword flags) const
{
        size_t slot = Slots.size();
        while(slot--) {
                const CREItem *item = Slots[slot];
                if (!item) {
                        continue;
                }
                if ( (flags&item->Flags)!=flags) {
                                continue;
                }
                if (resref[0] && strnicmp(item->ItemResRef, resref,8) ) {
                        continue;
                }
                return true;
        }
        return false;
}

void Inventory::KillSlot(unsigned int index)
{
        if (InventoryType==INVENTORY_HEAP) {
                Slots.erase(Slots.begin()+index);
                return;
        }
        CREItem *item = Slots[index];
        if (!item) {
                return;
        }

        //the used up item vanishes from the quickslot bar
        if (Owner->InParty) {
                core->SetEventFlag( EF_ACTION );
        }

        Slots[index] = NULL;
        int effect = core->QuerySlotEffects( index );
        if (!effect) {
                return;
        }
        RemoveSlotEffects( index );
        Item *itm = gamedata->GetItem(item->ItemResRef);
        //this cannot happen, but stuff happens!
        if (!itm) {
                return;
        }
        ItemExcl &= ~itm->ItemExcl;

        switch (effect) {
                case SLOT_EFFECT_LEFT:
                        UpdateShieldAnimation(0);
                        break;
                case SLOT_EFFECT_MISSILE:
                        //getting a new projectile of the same type
                        if (Equipped + SLOT_MELEE == (int) index) {
                                if (Equipped < 0) {
                                        //always get the projectile weapon header (this quiver was equipped)
                                        ITMExtHeader *header = itm->GetWeaponHeader(true);
                                        Equipped = FindRangedProjectile(header->ProjectileQualifier);
                                        if (Equipped!=IW_NO_EQUIPPED) {
                                                EquipItem(Equipped+SLOT_MELEE);
                                        } else {
                                                EquipItem(SLOT_FIST);
                                        }
                                }
                        }
                        UpdateWeaponAnimation();
                        break;
                case SLOT_EFFECT_MELEE:
                        // reset Equipped if it was the removed item
                        if (Equipped+SLOT_MELEE == (int)index)
                                Equipped = IW_NO_EQUIPPED;
                        else if (Equipped < 0) {
                                //always get the projectile weapon header (this is a bow, because Equipped is negative)
                                ITMExtHeader *header = itm->GetWeaponHeader(true);
                                if (header) {
                                        //find the equipped type
                                        int type = header->ProjectileQualifier;
                                        int weaponslot = FindTypedRangedWeapon(type);
                                        CREItem *item2 = Slots[weaponslot];
                                        if (item2) {
                                                Item *itm2 = gamedata->GetItem(item2->ItemResRef);
                                                if (itm2) {
                                                        if (type == header->ProjectileQualifier) {
                                                                Equipped = FindRangedProjectile(header->ProjectileQualifier);
                                                                if (Equipped!=IW_NO_EQUIPPED) {
                                                                        EquipItem(Equipped+SLOT_MELEE);
                                                                } else {
                                                                        EquipItem(SLOT_FIST);
                                                                }
                                                        }
                                                        gamedata->FreeItem(itm2, item2->ItemResRef, false);
                                                }
                                        }
                                }
                        }
                        // reset Equipped if it is a ranged weapon slot
                        // but not magic weapon slot!

                        UpdateWeaponAnimation();      
                        break;
                case SLOT_EFFECT_HEAD:
                        Owner->SetUsedHelmet("");
                        break;
                case SLOT_EFFECT_ITEM:
                        //remove the armor type only if this item is responsible for it
                        if ((ieDword) (itm->AnimationType[0]-'1') == Owner->GetBase(IE_ARMOR_TYPE)) {
                                Owner->SetBase(IE_ARMOR_TYPE, 0);
                        }
                        break;
        }
        gamedata->FreeItem(itm, item->ItemResRef, false);
}
/** if resref is "", then destroy ALL items
this function can look for stolen, equipped, identified, destructible
etc, items. You just have to specify the flags in the bitmask
specifying 1 in a bit signifies a requirement */
unsigned int Inventory::DestroyItem(const char *resref, ieDword flags, ieDword count)
{
        unsigned int destructed = 0;
        size_t slot = Slots.size();

        while(slot--) {
                //ignore the fist slot
                if (slot == (unsigned int)SLOT_FIST) {
                        continue;
                }

                CREItem *item = Slots[slot];
                if (!item) {
                        continue;
                }
                // here you can simply destroy all items of a specific type
                if ( (flags&item->Flags)!=flags) {
                        continue;
                }
                if (resref[0] && strnicmp(item->ItemResRef, resref, 8) ) {
                        continue;
                }
                //we need to acknowledge that the item was destroyed
                //use unequip stuff, decrease encumbrance etc,
                //until that, we simply erase it
                ieDword removed;

                if (item->Flags&IE_INV_ITEM_STACKED) {
                        removed=item->Usages[0];
                        if (count && (removed + destructed > count) ) {
                                removed = count - destructed;
                                item = RemoveItem( (unsigned int) slot, removed );
                        }
                        else {
                                KillSlot( (unsigned int) slot);
                        }
                } else {
                        removed=1;
                        KillSlot( (unsigned int) slot);
                }
                delete item;
                Changed = true;
                destructed+=removed;
                if (count && (destructed>=count) )
                        break;
        }
        if (Changed && Owner && Owner->InParty) core->DisplayConstantString(STR_LOSTITEM, 0xbcefbc);

        return destructed;
}

CREItem *Inventory::RemoveItem(unsigned int slot, unsigned int count)
{
        CREItem *item;

        if (slot >= Slots.size() ) {
                InvalidSlot(slot);
                return NULL;
        }
        Changed = true;
        item = Slots[slot];
        if (!count || !(item->Flags&IE_INV_ITEM_STACKED) ) {
                KillSlot(slot);
                return item;
        }
        if (count >= item->Usages[0]) {
                KillSlot(slot);
                return item;
        }

        CREItem *returned = new CREItem(*item);
        item->Usages[0]-=count;
        returned->Usages[0]=(ieWord) count;
        return returned;
}

//flags set disable item transfer
//except for undroppable and equipped, which are opposite (and shouldn't be set)
int Inventory::RemoveItem(const char *resref, unsigned int flags, CREItem **res_item)
{
        size_t slot = Slots.size();
        while(slot--) {
                CREItem *item = Slots[slot];
                if (!item) {
                        continue;
                }
                if ( ((flags^(IE_INV_ITEM_UNDROPPABLE|IE_INV_ITEM_EQUIPPED))&item->Flags)!=flags) {
                                continue;
                }
                if (resref[0] && strnicmp(item->ItemResRef, resref, 8) ) {
                        continue;
                }
                *res_item=RemoveItem( (unsigned int) slot, 0);
                return (int) slot;
        }
        *res_item = NULL;
        return -1;
}

void Inventory::SetSlotItem(CREItem* item, unsigned int slot)
{
        if (slot >= Slots.size() ) {
                InvalidSlot(slot);
                return;
        }
        Changed = true;
        if (Slots[slot]) {
                delete Slots[slot];
        }
        Slots[slot] = item;

        //update the action bar next time
        if (Owner->InParty) {
                core->SetEventFlag( EF_ACTION );
        }
}

int Inventory::AddSlotItem(CREItem* item, int slot, int slottype)
{
        int twohanded = item->Flags&IE_INV_ITEM_TWOHANDED;
        if (slot >= 0) {
                if ((unsigned)slot >= Slots.size()) {
                        InvalidSlot(slot);
                        return ASI_FAILED;
                }

                //check for equipping weapons 
                if (WhyCantEquip(slot,twohanded)) {
                        return ASI_FAILED;
                }

                if (!Slots[slot]) {
                        item->Flags |= IE_INV_ITEM_ACQUIRED;
                        Slots[slot] = item;
                        Changed = true;
                        EquipItem(slot);
                        return ASI_SUCCESS;
                }

                CREItem *myslot = Slots[slot];
                if (ItemsAreCompatible( myslot, item )) {
                        //calculate with the max movable stock
                        int chunk = item->Usages[0];
                        int newamount = myslot->Usages[0]+chunk;
                        if (newamount>myslot->StackAmount) {
                                newamount=myslot->StackAmount;
                                chunk = item->Usages[0]-newamount;
                        }
                        if (!chunk) {
                                return -1;
                        }
                        myslot->Flags |= IE_INV_ITEM_ACQUIRED;
                        myslot->Usages[0] = (ieWord) (myslot->Usages[0] + chunk);
                        item->Usages[0] = (ieWord) (item->Usages[0] - chunk);
                        Changed = true;
                        EquipItem(slot);
                        if (item->Usages[0] == 0) {
                                delete item;
                                return ASI_SUCCESS;
                        }
                        return ASI_PARTIAL;
                }
                return ASI_FAILED;
        }

        bool which;
        if (slot==SLOT_AUTOEQUIP) {
                which=true;
        } else {
                which=false;
        }
        int res = ASI_FAILED;
        int max = (int) Slots.size();
        for (int i = 0;i<max;i++) {
                //never autoequip in the magic slot!
                if (i==SLOT_MAGIC)
                        continue;
                if ((i<SLOT_INV || i>LAST_INV)!=which)
                        continue;
                if (!(core->QuerySlotType(i)&slottype))
                        continue;
                //the slot has been disabled for this actor
                if (i>=SLOT_MELEE && i<=LAST_MELEE) {
                        if (Owner->GetQuickSlot(i-SLOT_MELEE)==0xffff) {
                                continue;
                        }
                }
                //this is called by AddSlotItem as well
                //if (WhyCantEquip(i,twohanded))
                //      continue;
                int part_res = AddSlotItem (item, i);
                if (part_res == ASI_SUCCESS) return ASI_SUCCESS;
                else if (part_res == ASI_PARTIAL) res = ASI_PARTIAL;
        }

        return res;
}

int Inventory::AddStoreItem(STOItem* item, int action)
{
        CREItem *temp;
        int ret = -1;

        // item->PurchasedAmount is the number of items bought
        // (you can still add grouped objects in a single step,
        // just set up STOItem)
        while (item->PurchasedAmount) {
                //the first part of a STOItem is essentially a CREItem
                temp = new CREItem();
                memcpy( temp, item, sizeof( CREItem ) );
                //except the Expired flag
                temp->Expired=0;
                if (action==STA_STEAL) {
                        temp->Flags |= IE_INV_ITEM_STOLEN;
                }
                temp->Flags &= ~IE_INV_ITEM_SELECTED;

                ret = AddSlotItem( temp, SLOT_ONLYINVENTORY );
                if (ret != ASI_SUCCESS) {
                        delete temp;
                        break;
                }
                if (item->InfiniteSupply!=-1) {
                        if (!item->AmountInStock) {
                                break;
                        }
                        item->AmountInStock--;
                }
                item->PurchasedAmount--;
        }
        return ret;
}

/* could the source item be dropped on the target item to merge them */
bool Inventory::ItemsAreCompatible(CREItem* target, CREItem* source) const
{
        if (!target) {
                //this isn't always ok, please check!
                printMessage("Inventory","Null item encountered by ItemsAreCompatible()",YELLOW);
                return true;
        }

        if (!(source->Flags&IE_INV_ITEM_STACKED) ) {
                return false;
        }

        if (!strnicmp( target->ItemResRef, source->ItemResRef,8 )) {
                return true;
        }
        return false;
}

//depletes a magical item
//if flags==0 then magical weapons are not harmed
int Inventory::DepleteItem(ieDword flags)
{
        for (size_t i = 0; i < Slots.size(); i++) {
                CREItem *item = Slots[i];
                if (!item) {
                        continue;
                }

                //don't harm critical items
                //don't harm nonmagical items
                //don't harm indestructible items
                if ( (item->Flags&(IE_INV_ITEM_CRITICAL|IE_INV_DEPLETABLE)) != IE_INV_DEPLETABLE) {
                        continue;
                }

                //if flags = 0 then weapons are not depleted
                if (!flags) {
                        Item *itm = gamedata->GetItem( item->ItemResRef );
                        if (!itm)
                                continue;
                        //if the item is usable in weapon slot, then it is weapon
                        int weapon = core->CanUseItemType( SLOT_WEAPON, itm );
                        gamedata->FreeItem( itm, item->ItemResRef, false );
                        if (weapon)
                                continue;
                }
                //deplete item
                item->Usages[0]=0;
                item->Usages[1]=0;
                item->Usages[2]=0;
        }
        return -1;
}

// if flags is 0, skips undroppable items
// if flags is IE_INV_ITEM_UNDROPPABLE, doesn't skip undroppable items
// TODO: once all callers have been checked, this can be reversed to make more sense
int Inventory::FindItem(const char *resref, unsigned int flags) const
{
        for (size_t i = 0; i < Slots.size(); i++) {
                const CREItem *item = Slots[i];
                if (!item) {
                        continue;
                }
                if ( (flags^IE_INV_ITEM_UNDROPPABLE) & item->Flags ) {
                                continue;
                }
                if (resref[0] && strnicmp(item->ItemResRef, resref, 8) ) {
                        continue;
                }
                return (int) i;
        }
        return -1;
}

bool Inventory::DropItemAtLocation(unsigned int slot, unsigned int flags, Map *map, const Point &loc)
{
        if (slot >= Slots.size()) {
                return false;
        }
        //these slots will never 'drop' the item
        if ((slot==(unsigned int) SLOT_FIST) || (slot==(unsigned int) SLOT_MAGIC)) {
                return false;
        }

        CREItem *item = Slots[slot];
        if (!item) {
                return false;
        }
        //if you want to drop undoppable items, simply set IE_INV_UNDROPPABLE
        //by default, it won't drop them
        if ( ((flags^IE_INV_ITEM_UNDROPPABLE)&item->Flags)!=flags) {
                return false;
        }
        if (!map) {
                return false;
        }
        map->AddItemToLocation(loc, item);
        Changed = true;
        KillSlot(slot);
        return true;
}

bool Inventory::DropItemAtLocation(const char *resref, unsigned int flags, Map *map, const Point &loc)
{
        bool dropped = false;

        if (!map) {
                return false;
        }

        //this loop is going from start
        for (size_t i = 0; i < Slots.size(); i++) {
                //these slots will never 'drop' the item
                if ((i==(unsigned int) SLOT_FIST) || (i==(unsigned int) SLOT_MAGIC)) {
                        continue;
                }
                CREItem *item = Slots[i];
                if (!item) {
                        continue;
                }
                //if you want to drop undoppable items, simply set IE_INV_UNDROPPABLE
                //by default, it won't drop them
                if ( ((flags^IE_INV_ITEM_UNDROPPABLE)&item->Flags)!=flags) {
                                continue;
                }
                if (resref[0] && strnicmp(item->ItemResRef, resref, 8) ) {
                        continue;
                }
                map->AddItemToLocation(loc, item);
                Changed = true;
                dropped = true;
                KillSlot((unsigned int) i);
                //if it isn't all items then we stop here
                if (resref[0])
                        break;
        }
        return dropped;
}

CREItem *Inventory::GetSlotItem(unsigned int slot) const
{
        if (slot >= Slots.size() ) {
                InvalidSlot(slot);
                return NULL;
        }
        return Slots[slot];
}

ieDword Inventory::GetItemFlag(unsigned int slot) const
{
        const CREItem *item = GetSlotItem(slot);
        if (!item) {
                return 0;
        }
        return item->Flags;
}

bool Inventory::ChangeItemFlag(unsigned int slot, ieDword arg, int op)
{
        CREItem *item = GetSlotItem(slot);
        if (!item) {
                return false;
        }
        switch (op) {
        case BM_SET: item->Flags = arg; break;
        case BM_OR: item->Flags |= arg; break;
        case BM_NAND: item->Flags &= ~arg; break;
        case BM_XOR: item->Flags ^= arg; break;
        case BM_AND: item->Flags &= arg; break;
        }
        return true;
}

//this is the low level equipping
//all checks have been made previously
bool Inventory::EquipItem(unsigned int slot)
{
        ITMExtHeader *header;

        if (!Owner) {
                //maybe assertion too?
                return false;
        }
        CREItem *item = GetSlotItem(slot);
        if (!item) {
                return false;
        }

        int weaponslot;

        // add effects of an item just being equipped to actor's effect queue
        int effect = core->QuerySlotEffects( slot );
        Item *itm = gamedata->GetItem(item->ItemResRef);
        if (!itm) {
                printf("Invalid item Equipped: %s Slot: %d\n", item->ItemResRef, slot);
                return false;
        }
        switch (effect) {
        case SLOT_EFFECT_LEFT:
                //no idea if the offhand weapon has style, or simply the right
                //hand style is dominant
                UpdateShieldAnimation(itm);
                break;
        case SLOT_EFFECT_MELEE:
                //if weapon is ranged, then find quarrel for it and equip that
                slot -= SLOT_MELEE;
                weaponslot = slot;
                EquippedHeader = 0;
                header = itm->GetExtHeader(EquippedHeader);
                if (header && header->AttackType == ITEM_AT_BOW) {
                        //find the ranged projectile associated with it.
                        slot = FindRangedProjectile(header->ProjectileQualifier);
                        EquippedHeader = itm->GetWeaponHeaderNumber(true);
                } else if (header && header->AttackType == ITEM_AT_PROJECTILE) {
                        EquippedHeader = itm->GetWeaponHeaderNumber(true);
                } else {
                        EquippedHeader = itm->GetWeaponHeaderNumber(false);
                }
                header = itm->GetExtHeader(EquippedHeader);
                if (header) {
                        SetEquippedSlot(slot, EquippedHeader);
                        if (slot != IW_NO_EQUIPPED) {
                                Owner->SetupQuickSlot(ACT_WEAPON1+weaponslot, slot+SLOT_MELEE, EquippedHeader);
                        }
                        effect = 0; // SetEquippedSlot will already call AddSlotEffects
                        UpdateWeaponAnimation();
                }
                break;
        case SLOT_EFFECT_MISSILE:               
                //Get the ranged header of the projectile (so we theoretically allow shooting of daggers)
                EquippedHeader = itm->GetWeaponHeaderNumber(true);
                header = itm->GetExtHeader(EquippedHeader);
                if (header) {
                        weaponslot = FindTypedRangedWeapon(header->ProjectileQualifier);
                        if (weaponslot != SLOT_FIST) {
                                weaponslot -= SLOT_MELEE;
                                SetEquippedSlot((ieWordSigned) (slot-SLOT_MELEE), EquippedHeader);
                                //It is unsure if we can have multiple equipping headers for bows/arrow
                                //It is unclear which item's header index should go there
                                Owner->SetupQuickSlot(ACT_WEAPON1+weaponslot, slot, 0);
                        }
                        UpdateWeaponAnimation();
                }
                break;
        case SLOT_EFFECT_HEAD:
                Owner->SetUsedHelmet(itm->AnimationType);
                break;
        case SLOT_EFFECT_ITEM:
                //adjusting armour level if needed
                {
                        int l = itm->AnimationType[0]-'1';
                        if (l>=0 && l<=3) {
                                Owner->SetBase(IE_ARMOR_TYPE, l);
                        } else {
                                UpdateShieldAnimation(itm);
                        }
                }
                break;
        }
        gamedata->FreeItem(itm, item->ItemResRef, false);
        if (effect) {
                if (item->Flags & IE_INV_ITEM_CURSED) {
                        item->Flags|=IE_INV_ITEM_UNDROPPABLE;
                }
                AddSlotEffects( slot );
        }
        return true;
}

//the removecurse flag will check if it is possible to move the item to the inventory
//after a remove curse spell
bool Inventory::UnEquipItem(unsigned int slot, bool removecurse)
{
        CREItem *item = GetSlotItem(slot);
        if (!item) {
                return false;
        }
        if (removecurse) {
                if (item->Flags & IE_INV_ITEM_MOVABLE) {
                        item->Flags&=~IE_INV_ITEM_UNDROPPABLE;
                }
                if (FindCandidateSlot(SLOT_INVENTORY,0,item->ItemResRef)<0) {
                        return false;
                }
        }
        if (item->Flags & IE_INV_ITEM_UNDROPPABLE) {
                return false;
        }
        item->Flags &= ~IE_INV_ITEM_EQUIPPED; //no idea if this is needed, won't hurt
        return true;
}

// find the projectile
// type = 1 - bow
//        2 - xbow
//        4 - sling
//returns equipped code
int Inventory::FindRangedProjectile(unsigned int type) const
{
        for(int i=SLOT_RANGED;i<=LAST_RANGED;i++) {
                CREItem *Slot;

                const Item *itm = GetItemPointer(i, Slot);
                if (!itm) continue;
                ITMExtHeader *ext_header = itm->GetExtHeader(0);
                unsigned int weapontype = 0;
                if (ext_header) {
                        weapontype = ext_header->ProjectileQualifier;
                }
                gamedata->FreeItem(itm, Slot->ItemResRef, false);
                if (weapontype & type) {
                        return i-SLOT_MELEE;
                }
        }
        return IW_NO_EQUIPPED;
}

// find which bow is attached to the projectile marked by 'Equipped'
// returns slotcode
int Inventory::FindRangedWeapon() const
{
        if (Equipped>=0) return SLOT_FIST;
        return FindSlotRangedWeapon(Equipped+SLOT_MELEE);
}

int Inventory::FindSlotRangedWeapon(unsigned int slot) const
{
        if ((int)slot >= SLOT_MELEE) return SLOT_FIST;
        CREItem *Slot;
        Item *itm = GetItemPointer(slot, Slot);
        if (!itm) return SLOT_FIST;

        //always look for a ranged header when looking for a projectile/projector
        ITMExtHeader *ext_header = itm->GetWeaponHeader(true);
        unsigned int type = 0;
        if (ext_header) {
                type = ext_header->ProjectileQualifier;
        }
        gamedata->FreeItem(itm, Slot->ItemResRef, false);
        return FindTypedRangedWeapon(type);
}


// find bow for a specific projectile type
int Inventory::FindTypedRangedWeapon(unsigned int type) const
{
        if (!type) {
                return SLOT_FIST;
        }
        for(int i=SLOT_MELEE;i<=LAST_MELEE;i++) {
                CREItem *Slot;

                const Item *itm = GetItemPointer(i, Slot);
                if (!itm) continue;
                //always look for a ranged header when looking for a projectile/projector
                ITMExtHeader *ext_header = itm->GetWeaponHeader(true);
                int weapontype = 0;
                if (ext_header) {
                        weapontype = ext_header->ProjectileQualifier;
                }
                gamedata->FreeItem(itm, Slot->ItemResRef, false);
                if (weapontype & type) {
                        return i;
                }
        }
        return SLOT_FIST;
}

void Inventory::SetHeadSlot(int arg) { SLOT_HEAD=arg; }
void Inventory::SetFistSlot(int arg) { SLOT_FIST=arg; }
void Inventory::SetMagicSlot(int arg) { SLOT_MAGIC=arg; }
void Inventory::SetWeaponSlot(int arg)
{
        if (SLOT_MELEE==-1) {
                SLOT_MELEE=arg;
        }
        LAST_MELEE=arg;
}

//ranged slots should be before MELEE slots
void Inventory::SetRangedSlot(int arg)
{
        assert(SLOT_MELEE!=-1);
        if (SLOT_RANGED==-1) {
                SLOT_RANGED=arg;
        }
        LAST_RANGED=arg;
}

void Inventory::SetQuickSlot(int arg)
{
        if (SLOT_QUICK==-1) {
                SLOT_QUICK=arg;
        }
        LAST_QUICK=arg;
}

void Inventory::SetInventorySlot(int arg)
{
        if (SLOT_INV==-1) {
                SLOT_INV=arg;
        }
        LAST_INV=arg;
}

//multiple shield slots are allowed
//but in this case they should be interspersed with melee slots
void Inventory::SetShieldSlot(int arg)
{
        if (SLOT_LEFT!=-1) {
                assert(SLOT_MELEE+1==SLOT_LEFT);
                IWD2=true;
                return;
        }
        SLOT_LEFT=arg;
}

int Inventory::GetHeadSlot()
{
        return SLOT_HEAD;
}

int Inventory::GetFistSlot()
{
        return SLOT_FIST;
}

int Inventory::GetMagicSlot()
{
        return SLOT_MAGIC;
}

int Inventory::GetWeaponSlot()
{
        return SLOT_MELEE;
}

int Inventory::GetQuickSlot()
{
        return SLOT_QUICK;
}

int Inventory::GetInventorySlot()
{
        return SLOT_INV;
}

//if shield slot is empty, call again for fist slot!
int Inventory::GetShieldSlot() const
{
        if (IWD2) {
                if (Equipped>=0 && Equipped<=3) {
                        return Equipped*2+SLOT_MELEE+1;
                }
                return -1;
        }
        return SLOT_LEFT;
}

int Inventory::GetEquippedSlot() const
{
        if (Equipped == IW_NO_EQUIPPED) {
                return SLOT_FIST;
        }
        if (IWD2 && Equipped>=0) {
                //i've absolutely NO idea what is this 4 (Avenger)
                //Equipped should be 0-3 in iWD2, no???
                if (Equipped >= 4) {
                        return SLOT_MELEE;
                }
                return Equipped*2+SLOT_MELEE;
        }
        return Equipped+SLOT_MELEE;
}

bool Inventory::SetEquippedSlot(ieWordSigned slotcode, ieWord header)
{
        EquippedHeader = header;

        //doesn't work if magic slot is used, refresh the magic slot just in case
        if (HasItemInSlot("",SLOT_MAGIC) && (slotcode!=SLOT_MAGIC-SLOT_MELEE)) {
                Equipped = SLOT_MAGIC-SLOT_MELEE;
                UpdateWeaponAnimation();
                return false;
        }

        //if it is an illegal code, make it fist
        if ((size_t) (slotcode+SLOT_MELEE)>Slots.size()) {
                slotcode=IW_NO_EQUIPPED;
        }

        //unequipping (fist slot will be used now)
        if (slotcode == IW_NO_EQUIPPED || !HasItemInSlot("",slotcode+SLOT_MELEE)) {
                if (Equipped != IW_NO_EQUIPPED) {
                        RemoveSlotEffects( SLOT_MELEE+Equipped);
                }
                Equipped = IW_NO_EQUIPPED;
                //fist slot equipping effects
                AddSlotEffects(SLOT_FIST);
                UpdateWeaponAnimation();
                return true;
        }

        //equipping a weapon, but remove its effects first
        if (Equipped != IW_NO_EQUIPPED) {
                RemoveSlotEffects( SLOT_MELEE+Equipped);
        }

        Equipped = slotcode;
        int effects = core->QuerySlotEffects( SLOT_MELEE+Equipped );
        if (effects) {
                CREItem* item = GetSlotItem(SLOT_MELEE+Equipped);
                item->Flags|=IE_INV_ITEM_EQUIPPED;
                if (item->Flags & IE_INV_ITEM_CURSED) {
                        item->Flags|=IE_INV_ITEM_UNDROPPABLE;
                }
                AddSlotEffects( SLOT_MELEE+Equipped);
        }
        UpdateWeaponAnimation();
        return true;
}

int Inventory::GetEquipped() const
{
        return Equipped;
}

int Inventory::GetEquippedHeader() const
{
        return EquippedHeader;
}

//returns the fist weapon if there is nothing else
//This will return the actual weapon, I mean the bow in the case of bow+arrow combination
CREItem *Inventory::GetUsedWeapon(bool leftorright, int &slot) const
{
        CREItem *ret;

        if (SLOT_MAGIC!=-1) {
                slot = SLOT_MAGIC;
                ret = GetSlotItem(slot);
                if (ret && ret->ItemResRef[0]) {
                        return ret;
                }
        }
        if (leftorright) {
                //no shield slot
                slot = GetShieldSlot();
                if (slot>=0) {
                        ret = GetSlotItem(slot);
                        if (ret) {
                                return ret;
                        } else {
                                //we don't want to return fist for shield slot
                                return NULL;
                        }
                }
        }
        slot = GetEquippedSlot();
        if((core->QuerySlotEffects(slot) & SLOT_EFFECT_MISSILE) == SLOT_EFFECT_MISSILE) {
                slot = FindRangedWeapon();
        }
        ret = GetSlotItem(slot);
        if (!ret) {
                //return fist weapon
                slot = SLOT_FIST;
                ret = GetSlotItem(slot);
        }
        return ret;
}

// Returns index of first empty slot or slot with the same
// item and not full stack. On fail returns -1
// Can be used to check for full inventory
int Inventory::FindCandidateSlot(int slottype, size_t first_slot, const char *resref)
{
        if (first_slot >= Slots.size())
                return -1;

        for (size_t i = first_slot; i < Slots.size(); i++) {
                if (!(core->QuerySlotType( (unsigned int) i) & slottype) ) {
                        continue;
                }

                CREItem *item = Slots[i];

                if (!item) {
                        return (int) i; //this is a good empty slot
                }
                if (!resref) {
                        continue;
                }
                if (!(item->Flags&IE_INV_ITEM_STACKED) ) {
                        continue;
                }
                if (strnicmp( item->ItemResRef, resref, 8 )!=0) {
                        continue;
                }
                // check if the item fits in this slot, we use the cached
                // stackamount value
                if (item->Usages[0]<item->StackAmount) {
                        return (int) i;
                }
        }

        return -1;
}

void Inventory::AddSlotItemRes(const ieResRef ItemResRef, int SlotID, int Charge0, int Charge1, int Charge2)
{
        CREItem *TmpItem = new CREItem();
        strnlwrcpy(TmpItem->ItemResRef, ItemResRef, 8);
        TmpItem->Expired=0;
        TmpItem->Usages[0]=(ieWord) Charge0;
        TmpItem->Usages[1]=(ieWord) Charge1;
        TmpItem->Usages[2]=(ieWord) Charge2;
        TmpItem->Flags=0;
        if (core->ResolveRandomItem(TmpItem) && gamedata->Exists(TmpItem->ItemResRef, IE_ITM_CLASS_ID)) {
                AddSlotItem( TmpItem, SlotID );
        } else {
                delete TmpItem;
        }
        CalculateWeight();
}

void Inventory::SetSlotItemRes(const ieResRef ItemResRef, int SlotID, int Charge0, int Charge1, int Charge2)
{
        if(ItemResRef[0]) {
                CREItem *TmpItem = new CREItem();
                strnlwrcpy(TmpItem->ItemResRef, ItemResRef, 8);
                TmpItem->Expired=0;
                TmpItem->Usages[0]=(ieWord) Charge0;
                TmpItem->Usages[1]=(ieWord) Charge1;
                TmpItem->Usages[2]=(ieWord) Charge2;
                TmpItem->Flags=0;
                if (core->ResolveRandomItem(TmpItem) && gamedata->Exists(TmpItem->ItemResRef, IE_ITM_CLASS_ID)) {
                        SetSlotItem( TmpItem, SlotID );
                } else {
                        delete TmpItem;
                }
        } else {
                //if the item isn't creatable, we still destroy the old item
                KillSlot( SlotID );
        }
        CalculateWeight();
}

void Inventory::BreakItemSlot(ieDword slot)
{
        ieResRef newItem;
        CREItem *Slot;

        const Item *itm = GetItemPointer(slot, Slot);
        if (!itm) return;
        //if it is the magic weapon slot, don't break it, just remove it, because it couldn't be removed
        if(slot ==(unsigned int) SLOT_MAGIC) {
                newItem[0]=0;
        } else {
                memcpy(newItem, itm->ReplacementItem,sizeof(newItem) );
        }
        gamedata->FreeItem( itm, Slot->ItemResRef, true );
        //this depends on setslotitemres using setslotitem
        SetSlotItemRes(newItem, slot, 0,0,0);
}

void Inventory::dump()
{
        printf( "INVENTORY:\n" );
        for (unsigned int i = 0; i < Slots.size(); i++) {
                CREItem* itm = Slots[i];

                if (!itm) {
                        continue;
                }

                printf ( "%2u: %8.8s - (%d %d %d) %x Wt: %d x %dLb\n", i, itm->ItemResRef, itm->Usages[0], itm->Usages[1], itm->Usages[2], itm->Flags, itm->StackAmount, itm->Weight );
        }

        printf( "Equipped: %d\n", Equipped );
        Changed = true;
        CalculateWeight();
        printf( "Total weight: %d\n", Weight );
}

void Inventory::EquipBestWeapon(int flags)
{
        int i;
        int damage = -1;
        ieDword best_slot = SLOT_FIST;
        ITMExtHeader *header;
        CREItem *Slot;
        char AnimationType[2]={0,0};
        ieWord MeleeAnimation[3]={100,0,0};

        //cannot change equipment when holding magic weapons
        if (Equipped == SLOT_MAGIC-SLOT_MELEE) {
                return;
        }

        if (flags&EQUIP_RANGED) {
                for(i=SLOT_RANGED;i<LAST_RANGED;i++) {
                        const Item *itm = GetItemPointer(i, Slot);
                        if (!itm) continue;
                        //best ranged
                        int tmp = itm->GetDamagePotential(true, header);
                        if (tmp>damage) {
                                best_slot = i;
                                damage = tmp;
                                memcpy(AnimationType,itm->AnimationType,sizeof(AnimationType) );
                                memcpy(MeleeAnimation,header->MeleeAnimation,sizeof(MeleeAnimation) );
                        }
                        gamedata->FreeItem( itm, Slot->ItemResRef, false );
                }

                //ranged melee weapons like throwing daggers (not bows!)
                for(i=SLOT_MELEE;i<LAST_MELEE;i++) {
                        const Item *itm = GetItemPointer(i, Slot);
                        if (!itm) continue;
                        //best ranged
                        int tmp = itm->GetDamagePotential(true, header);
                        if (tmp>damage) {
                                best_slot = i;
                                damage = tmp;
                                memcpy(AnimationType,itm->AnimationType,sizeof(AnimationType) );
                                memcpy(MeleeAnimation,header->MeleeAnimation,sizeof(MeleeAnimation) );
                        }
                        gamedata->FreeItem( itm, Slot->ItemResRef, false );
                }
        }

        if (flags&EQUIP_MELEE) {
                for(i=SLOT_MELEE;i<LAST_MELEE;i++) {
                        const Item *itm = GetItemPointer(i, Slot);
                        if (!itm) continue;
                        //the Slot flag is enough for this
                        //though we need animation type/damagepotential anyway
                        if (Slot->Flags&IE_INV_ITEM_BOW) continue;
                        //best melee
                        int tmp = itm->GetDamagePotential(false, header);
                        if (tmp>damage) {
                                best_slot = i;
                                damage = tmp;
                                memcpy(AnimationType,itm->AnimationType,sizeof(AnimationType) );
                                memcpy(MeleeAnimation,header->MeleeAnimation,sizeof(MeleeAnimation) );
                        }
                        gamedata->FreeItem( itm, Slot->ItemResRef, false );
                }
        }

        EquipItem(best_slot);
        UpdateWeaponAnimation();
}

#define ID_NONEED  0   //id is not important
#define ID_NEED    1   //id is important
#define ID_NO      2   //shouldn't id

/* returns true if there are more item usages not fitting in given array */
bool Inventory::GetEquipmentInfo(ItemExtHeader *array, int startindex, int count)
{
        int pos = 0;
        int actual = 0;
        memset(array, 0, count * sizeof(ItemExtHeader) );
        for(unsigned int idx=0;idx<Slots.size();idx++) {
                if (!core->QuerySlotEffects(idx)) {
                        continue;
                }
                CREItem *slot;

                const Item *itm = GetItemPointer(idx, slot);
                if (!itm) {
                        continue;
                }
                for(int ehc=0;ehc<itm->ExtHeaderCount;ehc++) {
                        ITMExtHeader *ext_header = itm->ext_headers+ehc;
                        if (ext_header->Location!=ITEM_LOC_EQUIPMENT) {
                                continue;
                        }
                        //skipping if we cannot use the item
                        int idreq1 = (slot->Flags&IE_INV_ITEM_IDENTIFIED);
                        int idreq2 = ext_header->IDReq;
                        switch (idreq2) {
                                case ID_NO:
                                        if (idreq1) continue;
                                        break;
                                case ID_NEED:
                                        if (!idreq1) continue;
                                default:;
                        }

                        actual++;
                        if (actual>startindex) {

                                //store the item, return if we can't store more
                                if (!count) {
                                        gamedata->FreeItem(itm, slot->ItemResRef, false);
                                        return true;
                                }
                                count--;
                                memcpy(array[pos].itemname, slot->ItemResRef, sizeof(ieResRef) );
                                array[pos].slot = idx;
                                array[pos].headerindex = ehc;
                                int slen = ((char *) &(array[pos].itemname)) -((char *) &(array[pos].AttackType));
                                memcpy(&(array[pos].AttackType), &(ext_header->AttackType), slen);
                                if (ext_header->Charges) {
                                        //don't modify ehc, it is a counter
                                        if (ehc>=CHARGE_COUNTERS) {
                                                array[pos].Charges=slot->Usages[0];
                                        } else {
                                                array[pos].Charges=slot->Usages[ehc];
                                        }
                                } else {
                                        array[pos].Charges=0xffff;
                                }
                                pos++;
                        }
                }
                gamedata->FreeItem(itm, slot->ItemResRef, false);
        }

        return false;
}

//The slot index value is optional, if you supply it,
// then ItemExcl will be returned as if the item was already unequipped
ieDword Inventory::GetEquipExclusion(int index) const
{
        if (index<0) {
                return ItemExcl;
        }
        CREItem *slot;
        const Item *itm = GetItemPointer(index, slot);
        if (!itm) {
                return ItemExcl;
        }
        ieDword ret = ItemExcl&~itm->ItemExcl;
        gamedata->FreeItem(itm, slot->ItemResRef, false);
        return ret;
}

void Inventory::UpdateShieldAnimation(Item *it)
{
        char AnimationType[2]={0,0};
        int WeaponType = -1;

        if (it) {
                memcpy(AnimationType, it->AnimationType, 2);
                if (core->CanUseItemType(SLOT_WEAPON, it))
                        WeaponType = IE_ANI_WEAPON_2W;
                else
                        WeaponType = IE_ANI_WEAPON_1H;
        } else {
                WeaponType = IE_ANI_WEAPON_1H;
        }
        Owner->SetUsedShield(AnimationType, WeaponType);
}

void Inventory::UpdateWeaponAnimation()
{
        int slot = GetEquippedSlot();
        int effect = core->QuerySlotEffects( slot );
        if (effect == SLOT_EFFECT_MISSILE) {
                // ranged weapon
                slot = FindRangedWeapon();
        }
        int WeaponType = -1;

        char AnimationType[2]={0,0};
        ieWord MeleeAnimation[3]={100,0,0};
        CREItem *Slot;

        // TODO: fix bows?

        ITMExtHeader *header = 0;
        const Item *itm = GetItemPointer(slot, Slot);
        if (itm) {
                itm->GetDamagePotential(false, header);
                memcpy(AnimationType,itm->AnimationType,sizeof(AnimationType) );
                //for twohanded flag, you don't need itm
                if (Slot->Flags & IE_INV_ITEM_TWOHANDED)
                        WeaponType = IE_ANI_WEAPON_2H;
                else {

                        // Examine shield slot to check if we're using two weapons
                        // TODO: for consistency, use same Item* access method as above
                        bool twoweapon = false;
                        int slot = GetShieldSlot();
                        CREItem* si = NULL;
                        if (slot>0) {
                                si = GetSlotItem( (ieDword) slot );
                        }
                        if (si) {
                                Item* it = gamedata->GetItem(si->ItemResRef);
                                if (core->CanUseItemType(SLOT_WEAPON, it))
                                        twoweapon = true;
                                gamedata->FreeItem(it, si->ItemResRef, false);
                        }

                        if (twoweapon)
                                WeaponType = IE_ANI_WEAPON_2W;
                        else
                                WeaponType = IE_ANI_WEAPON_1H;
                }
        }

        if (header)
                memcpy(MeleeAnimation,header->MeleeAnimation,
                         sizeof(MeleeAnimation) );
        if (itm)
                gamedata->FreeItem( itm, Slot->ItemResRef, false );
        Owner->SetUsedWeapon(AnimationType, MeleeAnimation, WeaponType);
}

//this function will also check disabled slots (if that feature will be imped)
bool Inventory::IsSlotBlocked(int slot) const
{
        if (slot<SLOT_MELEE) return false;
        if (slot>LAST_MELEE) return false;
        int otherslot;
        if (IWD2) {
                otherslot = slot+1;
        } else {
                otherslot = SLOT_LEFT;
        }
        return HasItemInSlot("",otherslot);
}

inline bool Inventory::TwoHandedInSlot(int slot) const
{
        CREItem *item;

        item = GetSlotItem(slot);
        if (!item) return false;
        if (item->Flags&IE_INV_ITEM_TWOHANDED) {
                return true;
        }
        return false;
}

int Inventory::WhyCantEquip(int slot, int twohanded) const
{
        // check only for hand slots
        if ((slot<SLOT_MELEE || slot>LAST_MELEE) && (slot != SLOT_LEFT) ) {
                return 0;
        }

        //magic items have the highest priority
        if ( HasItemInSlot("", SLOT_MAGIC)) {
                //magic weapon is in use
                return STR_MAGICWEAPON;
        }

        //can't equip in shield slot if a weapon slot is twohanded
        for (int i=SLOT_MELEE; i<=LAST_MELEE;i++) {
                //see GetShieldSlot
                int otherslot;
                if (IWD2) {
                        otherslot = ++i;
                } else {
                        otherslot = SLOT_LEFT;
                }
                if (slot==otherslot) {
                        if (TwoHandedInSlot(i)) {
                                return STR_TWOHANDED_USED;
                        }
                }
        }

        if (twohanded) {
                if (IWD2) {
                        if (slot>=SLOT_MELEE&&slot<=LAST_MELEE && (slot&1) ) {
                                return STR_NOT_IN_OFFHAND;
                        }
                } else {
                        if (slot==SLOT_LEFT) {
                                return STR_NOT_IN_OFFHAND;
                        }
                }
                if (IsSlotBlocked(slot)) {
                //cannot equip two handed while shield slot is in use?
                        return STR_OFFHAND_USED;
                }
        }
        return 0;
}

//recharge items on rest, if rest was partial, recharge only 'hours'
//if this latter functionality is unwanted, then simply don't recharge if
//hours != 0
void Inventory::ChargeAllItems(int hours)
{
        //this loop is going from start
        for (size_t i = 0; i < Slots.size(); i++) {
                CREItem *item = Slots[i];
                if (!item) {
                        continue;
                }

                Item *itm = gamedata->GetItem( item->ItemResRef );
                if (!itm)
                        continue;
                for(int h=0;h<CHARGE_COUNTERS;h++) {
                        ITMExtHeader *header = itm->GetExtHeader(h);
                        if (header && (header->RechargeFlags&IE_ITEM_RECHARGE)) {
                                unsigned short add = header->Charges;
                                if (hours && add>hours) add=hours;
                                add+=item->Usages[h];
                                if(add>header->Charges) add=header->Charges;
                                item->Usages[h]=add;
                        }
                }
                gamedata->FreeItem( itm, item->ItemResRef, false );
        }
}