WitherController.java

package net.citizensnpcs.nms.v1_17_R1.entity;

import org.bukkit.Bukkit;
import org.bukkit.craftbukkit.v1_17_R1.CraftServer;
import org.bukkit.craftbukkit.v1_17_R1.entity.CraftEntity;
import org.bukkit.craftbukkit.v1_17_R1.entity.CraftWither;
import org.bukkit.util.Vector;

import net.citizensnpcs.api.npc.NPC;
import net.citizensnpcs.nms.v1_17_R1.util.ForwardingNPCHolder;
import net.citizensnpcs.nms.v1_17_R1.util.NMSBoundingBox;
import net.citizensnpcs.nms.v1_17_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.nbt.CompoundTag;
import net.minecraft.sounds.SoundEvent;
import net.minecraft.tags.Tag;
import net.minecraft.world.damagesource.DamageSource;
import net.minecraft.world.entity.Entity;
import net.minecraft.world.entity.EntityType;
import net.minecraft.world.entity.boss.wither.WitherBoss;
import net.minecraft.world.entity.vehicle.AbstractMinecart;
import net.minecraft.world.entity.vehicle.Boat;
import net.minecraft.world.level.Level;
import net.minecraft.world.level.material.Fluid;
import net.minecraft.world.phys.AABB;
import net.minecraft.world.phys.Vec3;

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

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

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

        public EntityWitherNPC(EntityType<? extends WitherBoss> types, Level level) {
            this(types, level, null);
        }

        public EntityWitherNPC(EntityType<? extends WitherBoss> types, Level level, NPC npc) {
            super(types, level);
            this.npc = (CitizensNPC) npc;
        }

        @Override
        protected boolean canRide(Entity entity) {
            if (npc != null && (entity instanceof Boat || entity instanceof AbstractMinecart)) {
                return !npc.isProtected();
            }
            return super.canRide(entity);
        }

        @Override
        public void checkDespawn() {
            if (npc == null) {
                super.checkDespawn();
            }
        }

        @Override
        protected void customServerAiStep() {
            if (npc == null) {
                super.customServerAiStep();
            } else {
                NMSImpl.updateMinecraftAIState(npc, this);
                if (npc.useMinecraftAI()) {
                    super.customServerAiStep();
                }
                npc.update();
            }
        }

        @Override
        public void dismountTo(double d0, double d1, double d2) {
            NMS.enderTeleportTo(npc, d0, d1, d2, () -> super.dismountTo(d0, d1, d2));
        }

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

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

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

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

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

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

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

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

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

        @Override
        protected AABB makeBoundingBox() {
            return NMSBoundingBox.makeBB(npc, super.makeBoundingBox());
        }

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

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

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

        @Override
        public boolean updateFluidHeightAndDoFluidPushing(Tag<Fluid> Tag, double d0) {
            Vec3 old = getDeltaMovement().add(0, 0, 0);
            boolean res = super.updateFluidHeightAndDoFluidPushing(Tag, d0);
            if (!npc.isPushableByFluids()) {
                setDeltaMovement(old);
            }
            return res;
        }
    }

    public static class WitherNPC extends CraftWither implements ForwardingNPCHolder {
        public WitherNPC(EntityWitherNPC entity) {
            super((CraftServer) Bukkit.getServer(), entity);
        }
    }
}