bazaarflux/src/main/java/me/lethunderhawk/tradeplugin/input/player/NumberInputGUI.java

package me.lethunderhawk.tradeplugin.input.player;

import me.lethunderhawk.bazaarflux.util.gui.InventoryGUI;
import me.lethunderhawk.bazaarflux.util.gui.InventoryManager;
import net.kyori.adventure.text.Component;
import org.bukkit.Bukkit;
import org.bukkit.Material;
import org.bukkit.entity.Player;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.ItemMeta;
import org.bukkit.plugin.java.JavaPlugin;

import java.util.ArrayList;
import java.util.List;
import java.util.function.BiConsumer;

/**
 * Number input built on top of InventoryGUI.
 * Open with: InventoryManager.openFor(player, new NumberInputGUI(plugin, player, title, min, max, def, callback));
 */
public class NumberInputGUI extends InventoryGUI implements InventoryGUI.AutoCloseHandler {
    private final JavaPlugin plugin;
    private final Player player;
    private final int minValue;
    private final int maxValue;

    private final BiConsumer<Player, Integer> callback;
    private int currentValue;

    private static final int PAPER_SLOT = 13, CONFIRM_SLOT = 22, CANCEL_SLOT = 26;

    public NumberInputGUI(JavaPlugin plugin, Player player, String title,
                          int minValue, int maxValue, int defaultValue,
                          BiConsumer<Player, Integer> callback) {
        super(title, 27);
        this.plugin = plugin;
        this.player = player;
        this.minValue = minValue;
        this.maxValue = maxValue;
        this.currentValue = Math.max(minValue, Math.min(maxValue, defaultValue));
        this.callback = callback;

        buildContents();
    }

    private void buildContents() {
        // center display
        updateDisplay();

        // confirm button
        ItemStack confirm = make(Material.GREEN_DYE, "§a§lBestätigen");
        setItemWithClickAction(CONFIRM_SLOT, confirm, (p, t) -> {
            // Confirm -> close and return value
            finishAndClose(currentValue);
        });

        // cancel button
        ItemStack cancel = make(Material.BARRIER, "§c§lAbbrechen");
        setItemWithClickAction(CANCEL_SLOT, cancel, (p, t) -> {
            finishAndClose(0); // original code returned 0 on cancel
        });

        // paper slot: we need to handle left/right and shift. InventoryGUI only provides slot action without click type,
        // but GUIListener passes raw slot only. To handle click types we use the player's last click state via a small workaround:
        // we rely on the player sneaking for "shift" and toggle behavior between increment/decrement using right-click sub-GUI is omitted.
        // We'll implement: left-click (increment 1), sneak+left (increment 10).
        setItemWithClickAction(PAPER_SLOT, buildPaperWithContents(), (p, type) -> {
            if(type.isLeftClick()){
                currentValue = Math.min(maxValue, currentValue + (type.isShiftClick() ? 10 : 1));
            }else if(type.isRightClick()){
                currentValue = Math.max(minValue, currentValue - (type.isShiftClick() ? 10 : 1));
            }
            updateDisplay();
            // ensure client sees update
            p.updateInventory();
        });

        // fill remaining slots with background
        fillBackground(Material.GRAY_STAINED_GLASS_PANE, " ");
        player.updateInventory();
    }

    private ItemStack make(Material mat, String name) {
        ItemStack it = new ItemStack(mat);
        ItemMeta m = it.getItemMeta();
        if (m != null) {
            m.itemName(Component.text(name));
            it.setItemMeta(m);
        }
        return it;
    }

    private void updateDisplay() {
        ItemStack valueItem = buildPaperWithContents();
        setItem(PAPER_SLOT, valueItem);
    }
    private ItemStack buildPaperWithContents() {
        ItemStack valueItem = new ItemStack(Material.PAPER);
        ItemMeta meta = valueItem.getItemMeta();

        meta.itemName(Component.text("§eAktueller Wert: §6" + currentValue));

        List<Component> lore = new ArrayList<>();
        lore.add(Component.text("§7Min: §f" + minValue));
        lore.add(Component.text("§7Max: §f" + maxValue));
        lore.add(Component.text(""));
        lore.add(Component.text("§aLinksklick: §7+1"));
        lore.add(Component.text("§aRechtsklick: §7-1"));
        lore.add(Component.text("§aSchleichen + Klick: §7+/-10"));

        meta.lore(lore);
        valueItem.setItemMeta(meta);
        return valueItem;
    }

    private void finishAndClose(Integer result) {
        // ensure main-thread close & callback
        if (!Bukkit.isPrimaryThread()) {
            Bukkit.getScheduler().runTask(plugin, () -> finishAndClose(result));
            return;
        }
        // remove tracking and close handled by InventoryManager on close event; manually remove and close here
        InventoryManager.close(player.getUniqueId());
        player.closeInventory();
        callback.accept(player, result);
    }

    public void open() {
        if (minValue >= maxValue) {
            player.sendMessage("§cDu hast kein Geld zum Ausgeben!");
            return;
        }
        InventoryManager.openFor(player, this);
    }

    @Override
    public void onClosedByPlayer(Player p) {
        // accidental close -> null callback (original behaviour)
        callback.accept(p, null);
    }
}