Citizens2/v1_16_R2/src/main/java/net/citizensnpcs/nms/v1_16_R3/entity/EnderDragonController.java

package net.citizensnpcs.nms.v1_16_R2.entity;

import org.bukkit.Bukkit;
import net.minecraft.server.v1_16_R2.EntityMinecartAbstract;
import org.bukkit.craftbukkit.v1_16_R2.CraftServer;
import org.bukkit.craftbukkit.v1_16_R2.entity.CraftEnderDragon;
import org.bukkit.craftbukkit.v1_16_R2.entity.CraftEntity;
import org.bukkit.entity.EnderDragon;
import org.bukkit.util.Vector;

import net.citizensnpcs.api.event.NPCEnderTeleportEvent;
import net.citizensnpcs.api.event.NPCPushEvent;
import net.citizensnpcs.api.npc.NPC;
import net.citizensnpcs.nms.v1_16_R2.util.NMSImpl;
import net.citizensnpcs.npc.CitizensNPC;
import net.citizensnpcs.npc.ai.NPCHolder;
import net.citizensnpcs.util.Util;
import net.minecraft.server.v1_16_R2.DamageSource;
import net.minecraft.server.v1_16_R2.Entity;
import net.minecraft.server.v1_16_R2.EntityBoat;
import net.minecraft.server.v1_16_R2.EntityEnderDragon;
import net.minecraft.server.v1_16_R2.EntityTypes;
import net.minecraft.server.v1_16_R2.NBTTagCompound;
import net.minecraft.server.v1_16_R2.SoundEffect;
import net.minecraft.server.v1_16_R2.Vec3D;
import net.minecraft.server.v1_16_R2.World;

public class EnderDragonController extends MobEntityController {
    public EnderDragonController() {
        super(EntityEnderDragonNPC.class);
    }

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

    public static class EnderDragonNPC extends CraftEnderDragon implements NPCHolder {
        private final CitizensNPC npc;

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

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

    public static class EntityEnderDragonNPC extends EntityEnderDragon implements NPCHolder {
        private final CitizensNPC npc;

        public EntityEnderDragonNPC(EntityTypes<? extends EntityEnderDragon> types, World world) {
            this(types, world, null);
        }

        public EntityEnderDragonNPC(EntityTypes<? extends EntityEnderDragon> types, World world, NPC npc) {
            super(types, world);
            this.npc = (CitizensNPC) npc;
            if (npc != null) {
                NMSImpl.clearGoals(npc, goalSelector, targetSelector);
            }
        }

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

        @Override
        public void collide(net.minecraft.server.v1_16_R2.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 boolean d(NBTTagCompound save) {
            return npc == null ? super.d(save) : false;
        }

        @Override
        public void enderTeleportTo(double d0, double d1, double d2) {
            if (npc == null) {
                super.enderTeleportTo(d0, d1, d2);
                return;
            }
            NPCEnderTeleportEvent event = new NPCEnderTeleportEvent(npc);
            Bukkit.getPluginManager().callEvent(event);
            if (!event.isCancelled()) {
                super.enderTeleportTo(d0, d1, d2);
            }
        }

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

        private float getCorrectYaw(double tX, double tZ) {
            if (locZ() > tZ)
                return (float) (-Math.toDegrees(Math.atan((locX() - tX) / (locZ() - tZ))));
            if (locZ() < tZ) {
                return (float) (-Math.toDegrees(Math.atan((locX() - tX) / (locX() - tZ)))) + 180.0F;
            }
            return yaw;
        }

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

        @Override
        protected SoundEffect getSoundAmbient() {
            return NMSImpl.getSoundEffect(npc, super.getSoundAmbient(), NPC.AMBIENT_SOUND_METADATA);
        }

        @Override
        protected SoundEffect getSoundDeath() {
            return NMSImpl.getSoundEffect(npc, super.getSoundDeath(), NPC.DEATH_SOUND_METADATA);
        }

        @Override
        protected SoundEffect getSoundHurt(DamageSource damagesource) {
            return NMSImpl.getSoundEffect(npc, super.getSoundHurt(damagesource), NPC.HURT_SOUND_METADATA);
        }

        @Override
        public void i(double x, double y, double z) {
            if (npc == null) {
                super.i(x, y, z);
                return;
            }
            if (NPCPushEvent.getHandlerList().getRegisteredListeners().length == 0) {
                if (!npc.data().get(NPC.DEFAULT_PROTECTED_METADATA, true))
                    super.i(x, y, z);
                return;
            }
            Vector vector = new Vector(x, y, z);
            NPCPushEvent event = Util.callPushEvent(npc, vector);
            if (!event.isCancelled()) {
                vector = event.getCollisionVector();
                super.i(vector.getX(), vector.getY(), vector.getZ());
            }
            // when another entity collides, this method is called to push the
            // NPC so we prevent it from doing anything if the event is
            // cancelled.
        }

        @Override
        public boolean isLeashed() {
            if (npc == null)
                return super.isLeashed();
            boolean protectedDefault = npc.data().get(NPC.DEFAULT_PROTECTED_METADATA, true);
            if (!protectedDefault || !npc.data().get(NPC.LEASH_PROTECTED_METADATA, protectedDefault))
                return super.isLeashed();
            if (super.isLeashed()) {
                unleash(true, false); // clearLeash with client update
            }
            return false; // shouldLeash
        }

        @Override
        public void movementTick() {
            if (npc != null) {
                npc.update();
                NMSImpl.updateMinecraftAIState(npc, this);
            }
            if (npc != null && !npc.useMinecraftAI()) {
                Vec3D mot = getMot();
                if (mot.getX() != 0 || mot.getY() != 0 || mot.getZ() != 0) {
                    mot = mot.d(0.98, 0.98, 0.98);
                    yaw = getCorrectYaw(locX() + mot.getX(), locZ() + mot.getZ());
                    setPosition(locX() + mot.getX(), locY() + mot.getY(), locZ() + mot.getZ());
                    setMot(mot);
                }
            } else {
                super.movementTick();
            }
        }

        @Override
        protected boolean n(Entity entity) {
            if (npc != null && (entity instanceof EntityBoat || entity instanceof EntityMinecartAbstract)) {
                return !npc.data().get(NPC.DEFAULT_PROTECTED_METADATA, true);
            }
            return super.n(entity);
        }
    }
}