ChestShop-3/src/main/java/com/Acrobot/ChestShop/Listeners/PreShopCreation/ItemChecker.java

package com.Acrobot.ChestShop.Listeners.PreShopCreation;

import com.Acrobot.Breeze.Utils.MaterialUtil;
import com.Acrobot.Breeze.Utils.StringUtil;
import com.Acrobot.ChestShop.Configuration.Messages;
import com.Acrobot.ChestShop.Configuration.Properties;
import com.Acrobot.ChestShop.Events.PreShopCreationEvent;
import com.Acrobot.ChestShop.Signs.ChestShopSign;
import com.Acrobot.ChestShop.Utils.uBlock;
import org.bukkit.ChatColor;
import org.bukkit.block.Chest;
import org.bukkit.event.EventHandler;
import org.bukkit.event.EventPriority;
import org.bukkit.event.Listener;
import org.bukkit.inventory.ItemStack;

import java.util.regex.Matcher;

import static com.Acrobot.Breeze.Utils.MaterialUtil.*;
import static com.Acrobot.ChestShop.Events.PreShopCreationEvent.CreationOutcome.INVALID_ITEM;
import static com.Acrobot.ChestShop.Events.PreShopCreationEvent.CreationOutcome.ITEM_AUTOFILL;
import static com.Acrobot.ChestShop.Signs.ChestShopSign.ITEM_LINE;
import static com.Acrobot.ChestShop.Signs.ChestShopSign.AUTOFILL_CODE;

/**
 * @author Acrobot
 */
public class ItemChecker implements Listener {

    @EventHandler(priority = EventPriority.LOWEST)
    public static void onPreShopCreation(PreShopCreationEvent event) {
        String itemCode = event.getSignLine(ITEM_LINE);
        ItemStack item = MaterialUtil.getItem(itemCode);

        if (item == null) {
            if (Properties.ALLOW_AUTO_ITEM_FILL && itemCode.equals(AUTOFILL_CODE)) {
                Chest chest = uBlock.findConnectedChest(event.getSign());
                if (chest != null) {
                    for (ItemStack stack : chest.getInventory().getContents()) {
                        if (!MaterialUtil.isEmpty(stack)) {
                            item = stack;
                            break;
                        }
                    }
                }

                if (item == null) {
                    event.setSignLine(ITEM_LINE, ChatColor.BOLD + ChestShopSign.AUTOFILL_CODE);
                    event.setOutcome(ITEM_AUTOFILL);
                    event.getPlayer().sendMessage(Messages.prefix(Messages.CLICK_TO_AUTOFILL_ITEM));
                    return;
                }
            } else {
                event.setOutcome(INVALID_ITEM);
                return;
            }
        }

        itemCode = MaterialUtil.getSignName(item);

        if (StringUtil.getMinecraftStringWidth(itemCode) > MAXIMUM_SIGN_WIDTH) {
            event.setOutcome(INVALID_ITEM);
            return;
        }

        event.setSignLine(ITEM_LINE, itemCode);
    }

    private static boolean isSameItem(String newCode, ItemStack item) {
        ItemStack newItem = MaterialUtil.getItem(newCode);

        return newItem != null && MaterialUtil.equals(newItem, item);
    }

    private static String getMetadata(String itemCode) {
        Matcher m = METADATA.matcher(itemCode);

        if (!m.find()) {
            return "";
        }

        return m.group();
    }
}