NPC.java

package net.bylivet.kitpvp.utils;

import net.minecraft.server.v1_8_R3.*;
import org.bukkit.ChatColor;
import org.bukkit.Location;
import org.bukkit.craftbukkit.v1_8_R3.CraftWorld;
import org.bukkit.craftbukkit.v1_8_R3.entity.CraftLivingEntity;
import org.bukkit.craftbukkit.v1_8_R3.util.UnsafeList;
import org.bukkit.entity.Villager;
import org.bukkit.event.entity.CreatureSpawnEvent;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

public class NPC extends EntityVillager {
    public NPC(World server) {
        super(server);
        try {
            setField(goalSelector, PathfinderGoalSelector.class, new UnsafeList<PathfinderGoalSelector>(), "b");
            setField(targetSelector, PathfinderGoalSelector.class, new UnsafeList<PathfinderGoalSelector>(), "b");
            setField(goalSelector, PathfinderGoalSelector.class, new UnsafeList<PathfinderGoalSelector>(), "c");
            setField(targetSelector, PathfinderGoalSelector.class, new UnsafeList<PathfinderGoalSelector>(), "c");
        } catch (NoSuchFieldException | IllegalAccessException e) {
            e.printStackTrace();
        }
        this.goalSelector.a(0, new PathfinderGoalFloat(this));
        this.goalSelector.a(1, new PathfinderGoalLookAtTradingPlayer(this));
        this.goalSelector.a(5, new PathfinderGoalMoveTowardsRestriction(this, 0.6D));
        this.goalSelector.a(9, new PathfinderGoalInteract(this, EntityHuman.class, 3.0F, 1.0F));
        this.goalSelector.a(9, new PathfinderGoalInteract(this, EntityVillager.class, 5.0F, 0.02F));
        this.goalSelector.a(9, new PathfinderGoalRandomStroll(this, 0.6D));
        this.goalSelector.a(10, new PathfinderGoalLookAtPlayer(this, EntityHuman.class, 8.0F));
    }

    private static void setField(Object object, Class clas, Object value, String fieldValue) throws IllegalAccessException, NoSuchFieldException {
        Field field = clas.getDeclaredField(fieldValue);
        field.setAccessible(true);
        field.set(object, value);
    }

    @Override
    public void move(double d0, double d1, double d2) {

    }

    @Override
    public void collide(Entity entity) {

    }

    @Override
    public boolean damageEntity(DamageSource damagesource, float f) {

        return false;
    }

    @Override
    public void g(double d0, double d1, double d2) {

    }

    public void registerEntity(String name, int id, Class<? extends EntityInsentient> nmsClass, Class<? extends EntityInsentient> customClass){
        try {

            List<Map<?, ?>> dataMap = new ArrayList<>();
            for (Field f : EntityTypes.class.getDeclaredFields()){
                if (f.getType().getSimpleName().equals(Map.class.getSimpleName())){
                    f.setAccessible(true);
                    dataMap.add((Map<?, ?>) f.get(null));
                }
            }

            if (dataMap.get(2).containsKey(id)){
                dataMap.get(0).remove(name);
                dataMap.get(2).remove(id);
            }

            Method method = EntityTypes.class.getDeclaredMethod("a", Class.class, String.class, int.class);
            method.setAccessible(true);
            method.invoke(null, customClass, name, id);

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static Location loc;
    public static Villager villager;

    public static void spawn(){
        if (loc == null)
            return;
        World mcWorld = ((CraftWorld) loc.getWorld()).getHandle();
        final NPC customEnt = new NPC(mcWorld);
        customEnt.registerEntity("Villager", 120, EntityVillager.class, NPC.class);
        customEnt.setLocation(loc.getX(), loc.getY(), loc.getZ(), loc.getYaw(), loc.getPitch());
        ((CraftLivingEntity) customEnt.getBukkitEntity()).setRemoveWhenFarAway(false);
        mcWorld.addEntity(customEnt, CreatureSpawnEvent.SpawnReason.CUSTOM);
        villager = (Villager) customEnt.getBukkitEntity();
        villager.setCustomName(ChatColor.GREEN + "Velg kit");
    }

    public static void setloc(Location location) {
        loc = location;
        spawn();
    }

}