WitherController.java

package net.citizensnpcs.nms.v1_12_R1.entity;

import org.bukkit.Bukkit;
import org.bukkit.craftbukkit.v1_12_R1.CraftServer;
import org.bukkit.craftbukkit.v1_12_R1.entity.CraftEntity;
import org.bukkit.craftbukkit.v1_12_R1.entity.CraftWither;
import org.bukkit.entity.Wither;
import org.bukkit.util.Vector;

import net.citizensnpcs.api.npc.NPC;
import net.citizensnpcs.nms.v1_12_R1.util.NMSBoundingBox;
import net.citizensnpcs.nms.v1_12_R1.util.NMSImpl;
import net.citizensnpcs.npc.CitizensNPC;
import net.citizensnpcs.npc.ai.NPCHolder;
import net.citizensnpcs.util.NMS;
import net.citizensnpcs.util.Util;
import net.minecraft.server.v1_12_R1.AxisAlignedBB;
import net.minecraft.server.v1_12_R1.DamageSource;
import net.minecraft.server.v1_12_R1.Entity;
import net.minecraft.server.v1_12_R1.EntityWither;
import net.minecraft.server.v1_12_R1.EnumPistonReaction;
import net.minecraft.server.v1_12_R1.NBTTagCompound;
import net.minecraft.server.v1_12_R1.SoundEffect;
import net.minecraft.server.v1_12_R1.World;

public class WitherController extends MobEntityController {
    public WitherController() {
        super(EntityWitherNPC.class);
    }

    @Override
    public Wither getBukkitEntity() {
        return (Wither) super.getBukkitEntity();
    }

    public static class EntityWitherNPC extends EntityWither implements NPCHolder {
        private final CitizensNPC npc;

        public EntityWitherNPC(World world) {
            this(world, null);
        }

        public EntityWitherNPC(World world, NPC npc) {
            super(world);
            this.npc = (CitizensNPC) npc;
        }

        @Override
        public void a(AxisAlignedBB bb) {
            super.a(NMSBoundingBox.makeBB(npc, bb));
        }

        @Override
        public void a(Entity entity, float strength, double dx, double dz) {
            NMS.callKnockbackEvent(npc, strength, dx, dz, evt -> super.a(entity, (float) evt.getStrength(),
                    evt.getKnockbackVector().getX(), evt.getKnockbackVector().getZ()));
        }

        @Override
        public int bg() {
            return NMS.getFallDistance(npc, super.bg());
        }

        @Override
        protected SoundEffect cf() {
            return NMSImpl.getSoundEffect(npc, super.cf(), NPC.Metadata.DEATH_SOUND);
        }

        @Override
        public void collide(net.minecraft.server.v1_12_R1.Entity entity) {
            // this method is called by both the entities involved - cancelling
            // it will not stop the NPC from moving.
            super.collide(entity);
            if (npc != null) {
                Util.callCollisionEvent(npc, entity.getBukkitEntity());
            }
        }

        @Override
        public float ct() {
            return NMS.getJumpPower(npc, super.ct());
        }

        @Override
        protected SoundEffect d(DamageSource damagesource) {
            return NMSImpl.getSoundEffect(npc, super.d(damagesource), NPC.Metadata.HURT_SOUND);
        }

        @Override
        public boolean d(NBTTagCompound save) {
            return npc == null ? super.d(save) : false;
        }

        @Override
        public boolean dn() {
            return npc == null || !npc.data().has("wither-arrow-shield") ? super.dn()
                    : npc.data().get("wither-arrow-shield");
        }

        @Override
        public void f(double x, double y, double z) {
            Vector vector = Util.callPushEvent(npc, x, y, z);
            if (vector != null) {
                super.f(vector.getX(), vector.getY(), vector.getZ());
            }
        }

        @Override
        protected SoundEffect F() {
            return NMSImpl.getSoundEffect(npc, super.F(), NPC.Metadata.AMBIENT_SOUND);
        }

        @Override
        public CraftEntity getBukkitEntity() {
            if (npc != null && !(bukkitEntity instanceof NPCHolder)) {
                bukkitEntity = new WitherNPC(this);
            }
            return super.getBukkitEntity();
        }

        @Override
        public NPC getNPC() {
            return npc;
        }

        @Override
        public EnumPistonReaction getPushReaction() {
            return Util.callPistonPushEvent(npc) ? EnumPistonReaction.IGNORE : super.getPushReaction();
        }

        @Override
        public boolean isLeashed() {
            return NMSImpl.isLeashed(npc, super::isLeashed, this);
        }

        @Override
        protected void L() {
            if (npc == null) {
                super.L();
            }
        }

        @Override
        public int m(int i) {
            return npc == null ? super.m(i) : 0;
        }

        @Override
        protected void M() {
            if (npc == null) {
                super.M();
            } else {
                npc.update();
            }
        }
    }

    public static class WitherNPC extends CraftWither implements NPCHolder {
        private final CitizensNPC npc;

        public WitherNPC(EntityWitherNPC entity) {
            super((CraftServer) Bukkit.getServer(), entity);
            this.npc = entity.npc;
        }

        @Override
        public NPC getNPC() {
            return npc;
        }
    }
}