Code/net/minecraft/world/entity/monster/Phantom.java

package net.minecraft.world.entity.monster;

import java.util.Comparator;
import java.util.EnumSet;
import java.util.List;
import javax.annotation.Nullable;
import net.minecraft.core.BlockPos;
import net.minecraft.core.particles.ParticleTypes;
import net.minecraft.nbt.CompoundTag;
import net.minecraft.network.syncher.EntityDataAccessor;
import net.minecraft.network.syncher.EntityDataSerializers;
import net.minecraft.network.syncher.SynchedEntityData;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.sounds.SoundEvent;
import net.minecraft.sounds.SoundEvents;
import net.minecraft.sounds.SoundSource;
import net.minecraft.util.Mth;
import net.minecraft.world.DifficultyInstance;
import net.minecraft.world.damagesource.DamageSource;
import net.minecraft.world.entity.Entity;
import net.minecraft.world.entity.EntityDimensions;
import net.minecraft.world.entity.EntitySelector;
import net.minecraft.world.entity.EntitySpawnReason;
import net.minecraft.world.entity.EntityType;
import net.minecraft.world.entity.FlyingMob;
import net.minecraft.world.entity.LivingEntity;
import net.minecraft.world.entity.Mob;
import net.minecraft.world.entity.Pose;
import net.minecraft.world.entity.SpawnGroupData;
import net.minecraft.world.entity.ai.attributes.Attributes;
import net.minecraft.world.entity.ai.control.BodyRotationControl;
import net.minecraft.world.entity.ai.control.LookControl;
import net.minecraft.world.entity.ai.control.MoveControl;
import net.minecraft.world.entity.ai.goal.Goal;
import net.minecraft.world.entity.ai.targeting.TargetingConditions;
import net.minecraft.world.entity.animal.Cat;
import net.minecraft.world.entity.player.Player;
import net.minecraft.world.level.Level;
import net.minecraft.world.level.ServerLevelAccessor;
import net.minecraft.world.level.levelgen.Heightmap;
import net.minecraft.world.phys.Vec3;

public class Phantom extends FlyingMob implements Enemy {
    public static final float FLAP_DEGREES_PER_TICK = 7.448451F;
    public static final int TICKS_PER_FLAP = Mth.ceil(24.166098F);
    private static final EntityDataAccessor<Integer> ID_SIZE = SynchedEntityData.defineId(Phantom.class, EntityDataSerializers.INT);
    Vec3 moveTargetPoint = Vec3.ZERO;
    @Nullable
    BlockPos anchorPoint;
    Phantom.AttackPhase attackPhase = Phantom.AttackPhase.CIRCLE;

    public Phantom(EntityType<? extends Phantom> p_33101_, Level p_33102_) {
        super(p_33101_, p_33102_);
        this.xpReward = 5;
        this.moveControl = new Phantom.PhantomMoveControl(this);
        this.lookControl = new Phantom.PhantomLookControl(this);
    }

    @Override
    public boolean isFlapping() {
        return (this.getUniqueFlapTickOffset() + this.tickCount) % TICKS_PER_FLAP == 0;
    }

    @Override
    protected BodyRotationControl createBodyControl() {
        return new Phantom.PhantomBodyRotationControl(this);
    }

    @Override
    protected void registerGoals() {
        this.goalSelector.addGoal(1, new Phantom.PhantomAttackStrategyGoal());
        this.goalSelector.addGoal(2, new Phantom.PhantomSweepAttackGoal());
        this.goalSelector.addGoal(3, new Phantom.PhantomCircleAroundAnchorGoal());
        this.targetSelector.addGoal(1, new Phantom.PhantomAttackPlayerTargetGoal());
    }

    @Override
    protected void defineSynchedData(SynchedEntityData.Builder p_331815_) {
        super.defineSynchedData(p_331815_);
        p_331815_.define(ID_SIZE, 0);
    }

    public void setPhantomSize(int p_33109_) {
        this.entityData.set(ID_SIZE, Mth.clamp(p_33109_, 0, 64));
    }

    private void updatePhantomSizeInfo() {
        this.refreshDimensions();
        this.getAttribute(Attributes.ATTACK_DAMAGE).setBaseValue(6 + this.getPhantomSize());
    }

    public int getPhantomSize() {
        return this.entityData.get(ID_SIZE);
    }

    @Override
    public void onSyncedDataUpdated(EntityDataAccessor<?> p_33134_) {
        if (ID_SIZE.equals(p_33134_)) {
            this.updatePhantomSizeInfo();
        }

        super.onSyncedDataUpdated(p_33134_);
    }

    public int getUniqueFlapTickOffset() {
        return this.getId() * 3;
    }

    @Override
    protected boolean shouldDespawnInPeaceful() {
        return true;
    }

    @Override
    public void tick() {
        super.tick();
        if (this.level().isClientSide) {
            float f = Mth.cos((this.getUniqueFlapTickOffset() + this.tickCount) * 7.448451F * (float) (Math.PI / 180.0) + (float) Math.PI);
            float f1 = Mth.cos((this.getUniqueFlapTickOffset() + this.tickCount + 1) * 7.448451F * (float) (Math.PI / 180.0) + (float) Math.PI);
            if (f > 0.0F && f1 <= 0.0F) {
                this.level()
                    .playLocalSound(
                        this.getX(),
                        this.getY(),
                        this.getZ(),
                        SoundEvents.PHANTOM_FLAP,
                        this.getSoundSource(),
                        0.95F + this.random.nextFloat() * 0.05F,
                        0.95F + this.random.nextFloat() * 0.05F,
                        false
                    );
            }

            float f2 = this.getBbWidth() * 1.48F;
            float f3 = Mth.cos(this.getYRot() * (float) (Math.PI / 180.0)) * f2;
            float f4 = Mth.sin(this.getYRot() * (float) (Math.PI / 180.0)) * f2;
            float f5 = (0.3F + f * 0.45F) * this.getBbHeight() * 2.5F;
            this.level().addParticle(ParticleTypes.MYCELIUM, this.getX() + f3, this.getY() + f5, this.getZ() + f4, 0.0, 0.0, 0.0);
            this.level().addParticle(ParticleTypes.MYCELIUM, this.getX() - f3, this.getY() + f5, this.getZ() - f4, 0.0, 0.0, 0.0);
        }
    }

    @Override
    public void aiStep() {
        if (this.isAlive() && this.isSunBurnTick()) {
            this.igniteForSeconds(8.0F);
        }

        super.aiStep();
    }

    @Override
    public SpawnGroupData finalizeSpawn(ServerLevelAccessor p_33126_, DifficultyInstance p_33127_, EntitySpawnReason p_368653_, @Nullable SpawnGroupData p_33129_) {
        this.anchorPoint = this.blockPosition().above(5);
        this.setPhantomSize(0);
        return super.finalizeSpawn(p_33126_, p_33127_, p_368653_, p_33129_);
    }

    @Override
    public void readAdditionalSaveData(CompoundTag p_33132_) {
        super.readAdditionalSaveData(p_33132_);
        this.anchorPoint = p_33132_.read("anchor_pos", BlockPos.CODEC).orElse(null);
        this.setPhantomSize(p_33132_.getIntOr("size", 0));
    }

    @Override
    public void addAdditionalSaveData(CompoundTag p_33141_) {
        super.addAdditionalSaveData(p_33141_);
        p_33141_.storeNullable("anchor_pos", BlockPos.CODEC, this.anchorPoint);
        p_33141_.putInt("size", this.getPhantomSize());
    }

    @Override
    public boolean shouldRenderAtSqrDistance(double p_33107_) {
        return true;
    }

    @Override
    public SoundSource getSoundSource() {
        return SoundSource.HOSTILE;
    }

    @Override
    protected SoundEvent getAmbientSound() {
        return SoundEvents.PHANTOM_AMBIENT;
    }

    @Override
    protected SoundEvent getHurtSound(DamageSource p_33152_) {
        return SoundEvents.PHANTOM_HURT;
    }

    @Override
    protected SoundEvent getDeathSound() {
        return SoundEvents.PHANTOM_DEATH;
    }

    @Override
    protected float getSoundVolume() {
        return 1.0F;
    }

    @Override
    public boolean canAttackType(EntityType<?> p_33111_) {
        return true;
    }

    @Override
    public EntityDimensions getDefaultDimensions(Pose p_333771_) {
        int i = this.getPhantomSize();
        EntityDimensions entitydimensions = super.getDefaultDimensions(p_333771_);
        return entitydimensions.scale(1.0F + 0.15F * i);
    }

    boolean canAttack(ServerLevel p_365188_, LivingEntity p_367013_, TargetingConditions p_364315_) {
        return p_364315_.test(p_365188_, this, p_367013_);
    }

    static enum AttackPhase {
        CIRCLE,
        SWOOP;
    }

    class PhantomAttackPlayerTargetGoal extends Goal {
        private final TargetingConditions attackTargeting = TargetingConditions.forCombat().range(64.0);
        private int nextScanTick = reducedTickDelay(20);

        @Override
        public boolean canUse() {
            if (this.nextScanTick > 0) {
                this.nextScanTick--;
                return false;
            } else {
                this.nextScanTick = reducedTickDelay(60);
                ServerLevel serverlevel = getServerLevel(Phantom.this.level());
                List<Player> list = serverlevel.getNearbyPlayers(this.attackTargeting, Phantom.this, Phantom.this.getBoundingBox().inflate(16.0, 64.0, 16.0));
                if (!list.isEmpty()) {
                    list.sort(Comparator.<Entity, Double>comparing(Entity::getY).reversed());

                    for (Player player : list) {
                        if (Phantom.this.canAttack(serverlevel, player, TargetingConditions.DEFAULT)) {
                            Phantom.this.setTarget(player);
                            return true;
                        }
                    }
                }

                return false;
            }
        }

        @Override
        public boolean canContinueToUse() {
            LivingEntity livingentity = Phantom.this.getTarget();
            return livingentity != null ? Phantom.this.canAttack(getServerLevel(Phantom.this.level()), livingentity, TargetingConditions.DEFAULT) : false;
        }
    }

    class PhantomAttackStrategyGoal extends Goal {
        private int nextSweepTick;

        @Override
        public boolean canUse() {
            LivingEntity livingentity = Phantom.this.getTarget();
            return livingentity != null ? Phantom.this.canAttack(getServerLevel(Phantom.this.level()), livingentity, TargetingConditions.DEFAULT) : false;
        }

        @Override
        public void start() {
            this.nextSweepTick = this.adjustedTickDelay(10);
            Phantom.this.attackPhase = Phantom.AttackPhase.CIRCLE;
            this.setAnchorAboveTarget();
        }

        @Override
        public void stop() {
            if (Phantom.this.anchorPoint != null) {
                Phantom.this.anchorPoint = Phantom.this.level()
                    .getHeightmapPos(Heightmap.Types.MOTION_BLOCKING, Phantom.this.anchorPoint)
                    .above(10 + Phantom.this.random.nextInt(20));
            }
        }

        @Override
        public void tick() {
            if (Phantom.this.attackPhase == Phantom.AttackPhase.CIRCLE) {
                this.nextSweepTick--;
                if (this.nextSweepTick <= 0) {
                    Phantom.this.attackPhase = Phantom.AttackPhase.SWOOP;
                    this.setAnchorAboveTarget();
                    this.nextSweepTick = this.adjustedTickDelay((8 + Phantom.this.random.nextInt(4)) * 20);
                    Phantom.this.playSound(SoundEvents.PHANTOM_SWOOP, 10.0F, 0.95F + Phantom.this.random.nextFloat() * 0.1F);
                }
            }
        }

        private void setAnchorAboveTarget() {
            if (Phantom.this.anchorPoint != null) {
                Phantom.this.anchorPoint = Phantom.this.getTarget().blockPosition().above(20 + Phantom.this.random.nextInt(20));
                if (Phantom.this.anchorPoint.getY() < Phantom.this.level().getSeaLevel()) {
                    Phantom.this.anchorPoint = new BlockPos(
                        Phantom.this.anchorPoint.getX(), Phantom.this.level().getSeaLevel() + 1, Phantom.this.anchorPoint.getZ()
                    );
                }
            }
        }
    }

    class PhantomBodyRotationControl extends BodyRotationControl {
        public PhantomBodyRotationControl(final Mob p_33216_) {
            super(p_33216_);
        }

        @Override
        public void clientTick() {
            Phantom.this.yHeadRot = Phantom.this.yBodyRot;
            Phantom.this.yBodyRot = Phantom.this.getYRot();
        }
    }

    class PhantomCircleAroundAnchorGoal extends Phantom.PhantomMoveTargetGoal {
        private float angle;
        private float distance;
        private float height;
        private float clockwise;

        @Override
        public boolean canUse() {
            return Phantom.this.getTarget() == null || Phantom.this.attackPhase == Phantom.AttackPhase.CIRCLE;
        }

        @Override
        public void start() {
            this.distance = 5.0F + Phantom.this.random.nextFloat() * 10.0F;
            this.height = -4.0F + Phantom.this.random.nextFloat() * 9.0F;
            this.clockwise = Phantom.this.random.nextBoolean() ? 1.0F : -1.0F;
            this.selectNext();
        }

        @Override
        public void tick() {
            if (Phantom.this.random.nextInt(this.adjustedTickDelay(350)) == 0) {
                this.height = -4.0F + Phantom.this.random.nextFloat() * 9.0F;
            }

            if (Phantom.this.random.nextInt(this.adjustedTickDelay(250)) == 0) {
                this.distance++;
                if (this.distance > 15.0F) {
                    this.distance = 5.0F;
                    this.clockwise = -this.clockwise;
                }
            }

            if (Phantom.this.random.nextInt(this.adjustedTickDelay(450)) == 0) {
                this.angle = Phantom.this.random.nextFloat() * 2.0F * (float) Math.PI;
                this.selectNext();
            }

            if (this.touchingTarget()) {
                this.selectNext();
            }

            if (Phantom.this.moveTargetPoint.y < Phantom.this.getY() && !Phantom.this.level().isEmptyBlock(Phantom.this.blockPosition().below(1))) {
                this.height = Math.max(1.0F, this.height);
                this.selectNext();
            }

            if (Phantom.this.moveTargetPoint.y > Phantom.this.getY() && !Phantom.this.level().isEmptyBlock(Phantom.this.blockPosition().above(1))) {
                this.height = Math.min(-1.0F, this.height);
                this.selectNext();
            }
        }

        private void selectNext() {
            if (Phantom.this.anchorPoint == null) {
                Phantom.this.anchorPoint = Phantom.this.blockPosition();
            }

            this.angle = this.angle + this.clockwise * 15.0F * (float) (Math.PI / 180.0);
            Phantom.this.moveTargetPoint = Vec3.atLowerCornerOf(Phantom.this.anchorPoint)
                .add(this.distance * Mth.cos(this.angle), -4.0F + this.height, this.distance * Mth.sin(this.angle));
        }
    }

    static class PhantomLookControl extends LookControl {
        public PhantomLookControl(Mob p_33235_) {
            super(p_33235_);
        }

        @Override
        public void tick() {
        }
    }

    class PhantomMoveControl extends MoveControl {
        private float speed = 0.1F;

        public PhantomMoveControl(final Mob p_33241_) {
            super(p_33241_);
        }

        @Override
        public void tick() {
            if (Phantom.this.horizontalCollision) {
                Phantom.this.setYRot(Phantom.this.getYRot() + 180.0F);
                this.speed = 0.1F;
            }

            double d0 = Phantom.this.moveTargetPoint.x - Phantom.this.getX();
            double d1 = Phantom.this.moveTargetPoint.y - Phantom.this.getY();
            double d2 = Phantom.this.moveTargetPoint.z - Phantom.this.getZ();
            double d3 = Math.sqrt(d0 * d0 + d2 * d2);
            if (Math.abs(d3) > 1.0E-5F) {
                double d4 = 1.0 - Math.abs(d1 * 0.7F) / d3;
                d0 *= d4;
                d2 *= d4;
                d3 = Math.sqrt(d0 * d0 + d2 * d2);
                double d5 = Math.sqrt(d0 * d0 + d2 * d2 + d1 * d1);
                float f = Phantom.this.getYRot();
                float f1 = (float)Mth.atan2(d2, d0);
                float f2 = Mth.wrapDegrees(Phantom.this.getYRot() + 90.0F);
                float f3 = Mth.wrapDegrees(f1 * (180.0F / (float)Math.PI));
                Phantom.this.setYRot(Mth.approachDegrees(f2, f3, 4.0F) - 90.0F);
                Phantom.this.yBodyRot = Phantom.this.getYRot();
                if (Mth.degreesDifferenceAbs(f, Phantom.this.getYRot()) < 3.0F) {
                    this.speed = Mth.approach(this.speed, 1.8F, 0.005F * (1.8F / this.speed));
                } else {
                    this.speed = Mth.approach(this.speed, 0.2F, 0.025F);
                }

                float f4 = (float)(-(Mth.atan2(-d1, d3) * 180.0F / (float)Math.PI));
                Phantom.this.setXRot(f4);
                float f5 = Phantom.this.getYRot() + 90.0F;
                double d6 = this.speed * Mth.cos(f5 * (float) (Math.PI / 180.0)) * Math.abs(d0 / d5);
                double d7 = this.speed * Mth.sin(f5 * (float) (Math.PI / 180.0)) * Math.abs(d2 / d5);
                double d8 = this.speed * Mth.sin(f4 * (float) (Math.PI / 180.0)) * Math.abs(d1 / d5);
                Vec3 vec3 = Phantom.this.getDeltaMovement();
                Phantom.this.setDeltaMovement(vec3.add(new Vec3(d6, d8, d7).subtract(vec3).scale(0.2)));
            }
        }
    }

    abstract class PhantomMoveTargetGoal extends Goal {
        public PhantomMoveTargetGoal() {
            this.setFlags(EnumSet.of(Goal.Flag.MOVE));
        }

        protected boolean touchingTarget() {
            return Phantom.this.moveTargetPoint.distanceToSqr(Phantom.this.getX(), Phantom.this.getY(), Phantom.this.getZ()) < 4.0;
        }
    }

    class PhantomSweepAttackGoal extends Phantom.PhantomMoveTargetGoal {
        private static final int CAT_SEARCH_TICK_DELAY = 20;
        private boolean isScaredOfCat;
        private int catSearchTick;

        @Override
        public boolean canUse() {
            return Phantom.this.getTarget() != null && Phantom.this.attackPhase == Phantom.AttackPhase.SWOOP;
        }

        @Override
        public boolean canContinueToUse() {
            LivingEntity livingentity = Phantom.this.getTarget();
            if (livingentity == null) {
                return false;
            } else if (!livingentity.isAlive()) {
                return false;
            } else if (livingentity instanceof Player player && (livingentity.isSpectator() || player.isCreative())) {
                return false;
            } else if (!this.canUse()) {
                return false;
            } else {
                if (Phantom.this.tickCount > this.catSearchTick) {
                    this.catSearchTick = Phantom.this.tickCount + 20;
                    List<Cat> list = Phantom.this.level().getEntitiesOfClass(Cat.class, Phantom.this.getBoundingBox().inflate(16.0), EntitySelector.ENTITY_STILL_ALIVE);

                    for (Cat cat : list) {
                        cat.hiss();
                    }

                    this.isScaredOfCat = !list.isEmpty();
                }

                return !this.isScaredOfCat;
            }
        }

        @Override
        public void start() {
        }

        @Override
        public void stop() {
            Phantom.this.setTarget(null);
            Phantom.this.attackPhase = Phantom.AttackPhase.CIRCLE;
        }

        @Override
        public void tick() {
            LivingEntity livingentity = Phantom.this.getTarget();
            if (livingentity != null) {
                Phantom.this.moveTargetPoint = new Vec3(livingentity.getX(), livingentity.getY(0.5), livingentity.getZ());
                if (Phantom.this.getBoundingBox().inflate(0.2F).intersects(livingentity.getBoundingBox())) {
                    Phantom.this.doHurtTarget(getServerLevel(Phantom.this.level()), livingentity);
                    Phantom.this.attackPhase = Phantom.AttackPhase.CIRCLE;
                    if (!Phantom.this.isSilent()) {
                        Phantom.this.level().levelEvent(1039, Phantom.this.blockPosition(), 0);
                    }
                } else if (Phantom.this.horizontalCollision || Phantom.this.hurtTime > 0) {
                    Phantom.this.attackPhase = Phantom.AttackPhase.CIRCLE;
                }
            }
        }
    }
}