import lombok.SneakyThrows;
import org.bukkit.Bukkit;
import org.bukkit.Material;
import org.bukkit.entity.Player;

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class UpdateTittleContainers {

    static Class<?> packetclass;
    static Method handle;
    static Field playerConnection;
    static Class<?> packetConnectionClass;
    static Class<?> chatBaseCompenent;
    static Class<?> chatCompenentSubClass;
    static Class<?> containersClass;
    static Class<?> containerClass;
    static Constructor<?> packetConstructor;

    public static void loadNmsClasses() throws ClassNotFoundException, NoSuchMethodException, NoSuchFieldException {

        if (packetclass == null)
            packetclass = Class.forName(versionCheckNms("Packet"));
        if (handle == null)
            handle = Class.forName(versionCheckBukkit("entity.CraftPlayer")).getMethod("getHandle");
        if (playerConnection == null)
            playerConnection = Class.forName(versionCheckNms("EntityPlayer")).getField("playerConnection");
        if (packetConnectionClass == null)
            packetConnectionClass = Class.forName(versionCheckNms("PlayerConnection"));
        if (chatBaseCompenent == null)
            chatBaseCompenent = Class.forName(versionCheckNms("IChatBaseComponent"));
        if (containersClass == null)
            containersClass = Class.forName(versionCheckNms("Containers"));
        if (containerClass == null)
            containerClass = Class.forName(versionCheckNms("Container"));
        if (chatCompenentSubClass == null)
            chatCompenentSubClass = Class.forName(versionCheckNms("IChatBaseComponent$ChatSerializer"));
        if (packetConstructor == null)
            packetConstructor = Class.forName(versionCheckNms("PacketPlayOutOpenWindow")).getConstructor(int.class, containersClass, chatBaseCompenent);
    }

    @SneakyThrows
    public static void update(Player p, String title, Material container, int inventorySize) {
        loadNmsClasses();

        try {

            Object player = p.getClass().getMethod("getHandle").invoke(p);
            Object activeContainer = player.getClass().getField("activeContainer").get(player);
            Object windowId = activeContainer.getClass().getField("windowId").get(activeContainer);


            Method declaredMethodChat = chatCompenentSubClass.getMethod("b", String.class);
            Object inventoryTittle = declaredMethodChat.invoke(null, "'" + title + "'");

            Object inventoryType = null;
            if (container == Material.HOPPER)
                inventoryType = containersClass.getField("HOPPER").get(null);
            if (container == Material.CHEST)
                if (inventorySize % 9 == 0)
                    inventoryType = containersClass.getField("GENERIC_9X" + inventorySize / 9).get(null);
                else
                    inventoryType = containersClass.getField("GENERIC_9X3").get(null);

            Object methods = packetConstructor.newInstance(windowId, inventoryType, inventoryTittle);


            Object handles = handle.invoke(p);
            Object playerconect = playerConnection.get(handles);
            Method packet1 = packetConnectionClass.getMethod("sendPacket", packetclass);

            packet1.invoke(playerconect, methods);
            player.getClass().getMethod("updateInventory", containerClass).invoke(player, activeContainer);

        } catch (NoSuchFieldException | IllegalAccessException | NoSuchMethodException | InstantiationException | InvocationTargetException e) {
            e.printStackTrace();
        }


    }

    public static String versionCheckNms(String clazzName) {

        return "net.minecraft.server." + Bukkit.getServer().getClass().getPackageName().split("\\.")[3] + "." + clazzName;
    }

    public static String versionCheckBukkit(String clazzName) {

        return "org.bukkit.craftbukkit." + Bukkit.getServer().getClass().getPackageName().split("\\.")[3] + "." + clazzName;
    }

}