@EventHandler
    public void onBlockInteract(PlayerInteractEvent event) {
        final Player player = event.getPlayer();
        final FileConfiguration configuration = plugin.getConfig();

        if (!(event.getAction() == Action.RIGHT_CLICK_BLOCK)) {
            return;
        }

        final Optional<SignEnum> sign = SignEnum.forMaterial(event.getClickedBlock().getType());

        if(!sign.isPresent()){
            return;
        }

        final org.bukkit.block.Sign signBlock = (org.bukkit.block.Sign) event.getClickedBlock().getState();
        final BlockData blockData = signBlock.getBlockData();

        if (!(blockData instanceof Directional)) {
            return;
        }

        final Directional directional = (Directional) blockData;
        final Block attached = signBlock.getBlock().getRelative(directional.getFacing().getOppositeFace());

        if (attached.getType() == Material.CHEST || attached.getType() == Material.TRAPPED_CHEST) {

            for (int i = 0; i < plugin.getLayoutLore().size(); i++) {
                if (!plugin.getLayoutLore().get(i).equals(signBlock.getLine(i))) {
                    return;
                }
            }

            //TODO: permission check
            final ChestLocation chestLocation = ChestLocation.getLocationFromLocation(signBlock.getLocation());
            if (plugin.getSigns().containsKey(chestLocation)
                    && !plugin.getSigns().get(chestLocation).contains(player.getUniqueId())) {

                player.sendMessage(Utils.colorChat(configuration.getString("messages.no-access-sign")));
                return;
            }

            if (!plugin.getSigns().containsKey(chestLocation)) {
                event.getClickedBlock().breakNaturally();
                return;
            }

            final Chest chest = (Chest) attached.getState();
            final Inventory blockInventory = chest.getBlockInventory();

            double priceMultiplier = 2.0;
            double totalSale = 0.0D;
            int slot = 0;
            final NumberFormat numberFormat = NumberFormat.getInstance();
            numberFormat.setGroupingUsed(true);

            final HashMap<Material, Integer> amounts = new HashMap<>();
            final HashMap<Material, Double> prices = new HashMap<>();

            String type;

            for (ItemStack itemStack : blockInventory) {
                if (itemStack == null || itemStack.getType() == Material.AIR) {
                    slot++;
                }

                type = itemStack != null ? itemStack.getType().toString().toLowerCase() : null;
                type = type != null ? type.replace("_", "") : null;

                if (plugin.getPrices().containsKey(type) && plugin.getPrices().get(type) > 0) {
                    chest.getInventory().setItem(slot, new ItemStack(Material.AIR));
                    totalSale = totalSale + plugin.getPrices().get(type)
                            * itemStack.getAmount()
                            * priceMultiplier;

                    if (prices.containsKey(itemStack.getType())) {
                        prices.put(itemStack.getType(),
                                prices.get(itemStack.getType())
                                        + plugin.getPrices().get(type) * itemStack.getAmount() * priceMultiplier);
                    }
                    prices.put(itemStack.getType(), plugin.getPrices().get(type)
                            * itemStack.getAmount() * priceMultiplier
                    );

                    if (amounts.containsKey(itemStack.getType())) {
                        amounts.put(
                                itemStack.getType(), amounts.get(itemStack.getType())
                                        + itemStack.getAmount()
                        );
                    }
                    amounts.put(
                            itemStack.getType(), itemStack.getAmount()
                    );
                }
            }

            final EconomyResponse response = plugin.getEconomy().depositPlayer(player, totalSale);

            if (response.transactionSuccess()) {
                player.sendMessage(Utils.colorChat(plugin.getConfig().getString("messages.sale"))
                        .replace("%amount%", numberFormat.format(totalSale)));
                if (plugin.getConfig().getBoolean("breakdown")) {
                    for (Map.Entry<Material, Integer> entry : amounts.entrySet()) {
                        final Material material = entry.getKey();
                        final Integer value = entry.getValue();
                        player.sendMessage(Utils.colorChat(plugin.getConfig().getString("messages.breakdown"))
                                .replaceAll("%amount%", value.toString())
                                .replace("%item%", StringUtils.capitalize(material.name().toLowerCase()
                                        .replace("_", " ")))
                                .replace("%price%", numberFormat.format(prices.get(material))));
                    }
                }
            }
        }
    }