Inventory system help.

#define DIALOG_INVENTORY 13337
#define MAX_ITEMS 20
#define MAX_ITEM_STACK 300
#define MAX_ITEM_NAME 32
#define egyezik(%1) (!strcmp(%1, true))
forward OnPlayerUseItem(playerid,ItemName[]);
new _ItemInfo[MAX_PLAYERS][MAX_ITEMS][2];
//0 = itemname, 1 = itemamount
/*
native AddItem(playerid,ItemName[],amount);
native RemoveItem(playerid,ItemName[],amount);
native PlayerHasItem(playerid,ItemName[]);
native ResetPlayerInventory(playerid);
native ShowInventory(playerid);
native SaveInventory(playerid);
native LoadInventory(playerid);
*/
stock GetItemName(playerid,item)
{
	new itemname[MAX_ITEM_NAME];
	if(_ItemInfo[playerid][item][1] > 0)
	{
		if(!egyezik(_ItemInfo[playerid][item][0],""))
		{
			format(itemname,sizeof(itemname),"%s",_ItemInfo[playerid][item][0]);
		}
	}
	return itemname;
}
stock SetItemName(playerid,item,ItemName[])
{
	if(_ItemInfo[playerid][item][1] > 0)
	{
		if(egyezik(_ItemInfo[playerid][item][0],""))
		{
			format(_ItemInfo[playerid][item][0],MAX_ITEM_NAME,"%s",ItemName);
		}
	}
}
stock GetItemAmount(playerid,ItemName[])
{
	new amount = 0;
	for(new i = 0; i < MAX_ITEMS; i++)
	{
		if(egyezik(_ItemInfo[playerid][i][0],ItemName))
		{
			if(_ItemInfo[playerid][i][1] > 0)
			{
				amount = _ItemInfo[playerid][i][1];
				break;
			}
		}
	}
	return amount;
}
stock GetItemID(playerid,ItemName[])
{
	new id = -1;
	for(new i = 0; i < MAX_ITEMS; i++)
	{
		if(egyezik(_ItemInfo[playerid][i][0],ItemName))
		{
			id = i;
			break;
		}
	}
	return id;
}
stock SetItemAmount(playerid,item,amount)
{
	if(_ItemInfo[playerid][item][1] > 0)
	{
		if(egyezik(_ItemInfo[item][0],""))
		{
			_ItemInfo[playerid][item][1] = amount;
		}
	}
}
stock RemoveItem(playerid,ItemName[],amount)
{
	new currentamount = 0;
	currentamount = GetItemAmount(playerid,ItemName);
	if(currentamount > 0)
	{
		if(currentamount - amount > 1)
		{
			new result = 0;
			result = currentamount - amount;
			SetItemAmount(playerid,GetItemID(playerid,ItemName),result);
		}
	}
}
stock AddItem(playerid,ItemName[],amount)
{
	new itemslot = -1;
	for(new i = 0; i < MAX_ITEMS; i++)
	{
		if(GetItemAmount(playerid,ItemName) < 1)
		{
			if(itemslot == -1)
			{
				itemslot = i;
				continue;
			}
		}
		if(egyezik(_ItemInfo[playerid][i][0],ItemName))
		{
			new currentamount = 0;
			currentamount = GetItemAmount(playerid,ItemName);
			new result = 0;
			result = currentamount + _ItemInfo[playerid][i][1] + amount;
			SetItemAmount(playerid,i,result);
			SendClientMessage(playerid,-1,"Egy itemből kaptál még pluszba!");
			if(result >= MAX_ITEM_STACK)
			{
				SetItemAmount(playerid,i,MAX_ITEM_STACK-1);
				SendClientMessage(playerid,-1,"Egy itemből túl sokat kaptál ezért a maxot megkaptad!");
				return 2;
			}
			return 1;
		}
	}
	if(itemslot > -1)
	{
		SetItemName(playerid,itemslot,ItemName);
		SetItemAmount(playerid,itemslot,amount);
		SendClientMessage(playerid,-1,"Egy itemből kaptál valamennyit, ez az első ilyen tárgy a táskádban!");
		if(GetItemAmount(playerid,GetItemName(playerid,itemslot)) > MAX_ITEM_STACK)
		{
			SetItemAmount(playerid,itemslot,MAX_ITEM_STACK);
			SendClientMessage(playerid,-1,"Egy itemből túl sokat kaptál ezért a maxot megkaptad, ez az első ilyen tárgy a táskádban!!");
			return 2;
		}
		return 1;
	}
	return 0;
}
stock ShowItems(playerid)
{
	new dialogstring[256],s[128];
	format(dialogstring,sizeof(dialogstring),"Tárgy\tMennyiség");
	for(new i = 0; i < MAX_ITEMS; i++)
	{
		if(GetItemAmount(playerid,GetItemName(playerid,i)) > 0)
		{
			if(!egyezik(GetItemName(playerid,i),""))
			{
				format(s,sizeof(s),"%s\t%d",GetItemName(playerid,i),GetItemAmount(playerid,GetItemName(playerid,i)));
				strcat(dialogstring,s);
			}
		}
	}
	ShowPlayerDialog(playerid,DIALOG_INVENTORY,DIALOG_STYLE_TABLIST_HEADERS,"Táska",dialogstring,"Használ","Mégse");
}
stock ResetPlayerInventory(playerid)
{
	for(new i = 0; i < MAX_ITEMS; i++)
	{
		SetItemAmount(playerid,i,0);
		SetItemName(playerid,i,"");
	}
}
stock PlayerItem(playerid,ItemName[])
{
	for(new i = 0; i < MAX_ITEMS; i++)
	{
		if(GetItemAmount(playerid,ItemName) > 0)
		{
			if(egyezik(GetItemName(playerid,i),ItemName))
			{
				return GetItemAmount(playerid,ItemName);
			}
		}
	}
	return 0;
}
stock LoadInventory(playerid)
{
}
stock SaveInventory(playerid)
{
}