/**
     * Get first page with matching item inside.
     *
     * @param item item you want to check.
     * @return inventory some contains at lest 1 item.
     */

    public Inventory getFirstPageWithItems(ItemStack item) {
        ArrayList<Inventory> inventoriesList = getInventory(this.location);
        if (inventoriesList.size() > 1) {
            for (Inventory inventory : inventoriesList)
                for (ItemStack itemStack : inventory.getContents())
                    if (itemStack != null && itemStack.getType() != Material.AIR && item != null && (itemStack.isSimilar(item) || itemStack.getType() == item.getType())   )
                        return inventory;
        } else {
            return inventoriesList.get(0);
        }
        return null;
    }

    /**
     * Get amount of one item type
     *
     * @param itemStack item you want to check amount.
     * @return amount of this itemStack.
     */
    public int getAmountOfOneItem(ItemStack itemStack){
        int amount=0;
        ArrayList<Inventory> inventoriesList = getInventory(this.location);
        for (Inventory inventory : inventoriesList)
            amount = ItemUtily.countItemStacks(itemStack, inventory);
        return amount;
    }