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

package net.minecraft.world.entity.monster;

import com.google.common.annotations.VisibleForTesting;
import java.util.EnumSet;
import javax.annotation.Nullable;
import net.minecraft.core.BlockPos;
import net.minecraft.core.particles.ParticleOptions;
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.tags.BiomeTags;
import net.minecraft.util.Mth;
import net.minecraft.util.RandomSource;
import net.minecraft.world.Difficulty;
import net.minecraft.world.DifficultyInstance;
import net.minecraft.world.damagesource.DamageSource;
import net.minecraft.world.effect.MobEffects;
import net.minecraft.world.entity.ConversionParams;
import net.minecraft.world.entity.ConversionType;
import net.minecraft.world.entity.Entity;
import net.minecraft.world.entity.EntityDimensions;
import net.minecraft.world.entity.EntitySpawnReason;
import net.minecraft.world.entity.EntityType;
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.MoveControl;
import net.minecraft.world.entity.ai.goal.Goal;
import net.minecraft.world.entity.ai.goal.target.NearestAttackableTargetGoal;
import net.minecraft.world.entity.animal.IronGolem;
import net.minecraft.world.entity.player.Player;
import net.minecraft.world.item.enchantment.EnchantmentHelper;
import net.minecraft.world.level.ChunkPos;
import net.minecraft.world.level.Level;
import net.minecraft.world.level.LevelAccessor;
import net.minecraft.world.level.ServerLevelAccessor;
import net.minecraft.world.level.WorldGenLevel;
import net.minecraft.world.level.levelgen.WorldgenRandom;
import net.minecraft.world.phys.Vec3;
import net.minecraft.world.scores.PlayerTeam;

public class Slime extends Mob implements Enemy {
    private static final EntityDataAccessor<Integer> ID_SIZE = SynchedEntityData.defineId(Slime.class, EntityDataSerializers.INT);
    public static final int MIN_SIZE = 1;
    public static final int MAX_SIZE = 127;
    public static final int MAX_NATURAL_SIZE = 4;
    private static final boolean DEFAULT_WAS_ON_GROUND = false;
    public float targetSquish;
    public float squish;
    public float oSquish;
    private boolean wasOnGround = false;

    public Slime(EntityType<? extends Slime> p_33588_, Level p_33589_) {
        super(p_33588_, p_33589_);
        this.fixupDimensions();
        this.moveControl = new Slime.SlimeMoveControl(this);
    }

    @Override
    protected void registerGoals() {
        this.goalSelector.addGoal(1, new Slime.SlimeFloatGoal(this));
        this.goalSelector.addGoal(2, new Slime.SlimeAttackGoal(this));
        this.goalSelector.addGoal(3, new Slime.SlimeRandomDirectionGoal(this));
        this.goalSelector.addGoal(5, new Slime.SlimeKeepOnJumpingGoal(this));
        this.targetSelector
            .addGoal(
                1,
                new NearestAttackableTargetGoal<>(
                    this, Player.class, 10, true, false, (p_375141_, p_375142_) -> Math.abs(p_375141_.getY() - this.getY()) <= 4.0
                )
            );
        this.targetSelector.addGoal(3, new NearestAttackableTargetGoal<>(this, IronGolem.class, true));
    }

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

    @Override
    protected void defineSynchedData(SynchedEntityData.Builder p_335838_) {
        super.defineSynchedData(p_335838_);
        p_335838_.define(ID_SIZE, 1);
    }

    @VisibleForTesting
    public void setSize(int p_33594_, boolean p_33595_) {
        int i = Mth.clamp(p_33594_, 1, 127);
        this.entityData.set(ID_SIZE, i);
        this.reapplyPosition();
        this.refreshDimensions();
        this.getAttribute(Attributes.MAX_HEALTH).setBaseValue(i * i);
        this.getAttribute(Attributes.MOVEMENT_SPEED).setBaseValue(0.2F + 0.1F * i);
        this.getAttribute(Attributes.ATTACK_DAMAGE).setBaseValue(i);
        if (p_33595_) {
            this.setHealth(this.getMaxHealth());
        }

        this.xpReward = i;
    }

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

    @Override
    public void addAdditionalSaveData(CompoundTag p_33619_) {
        super.addAdditionalSaveData(p_33619_);
        p_33619_.putInt("Size", this.getSize() - 1);
        p_33619_.putBoolean("wasOnGround", this.wasOnGround);
    }

    @Override
    public void readAdditionalSaveData(CompoundTag p_33607_) {
        this.setSize(p_33607_.getIntOr("Size", 0) + 1, false);
        super.readAdditionalSaveData(p_33607_);
        this.wasOnGround = p_33607_.getBooleanOr("wasOnGround", false);
    }

    public boolean isTiny() {
        return this.getSize() <= 1;
    }

    protected ParticleOptions getParticleType() {
        return ParticleTypes.ITEM_SLIME;
    }

    @Override
    protected boolean shouldDespawnInPeaceful() {
        return this.getSize() > 0;
    }

    @Override
    public void tick() {
        this.oSquish = this.squish;
        this.squish = this.squish + (this.targetSquish - this.squish) * 0.5F;
        super.tick();
        if (this.onGround() && !this.wasOnGround) {
            float f = this.getDimensions(this.getPose()).width() * 2.0F;
            float f1 = f / 2.0F;

            for (int i = 0; i < f * 16.0F; i++) {
                float f2 = this.random.nextFloat() * (float) (Math.PI * 2);
                float f3 = this.random.nextFloat() * 0.5F + 0.5F;
                float f4 = Mth.sin(f2) * f1 * f3;
                float f5 = Mth.cos(f2) * f1 * f3;
                this.level().addParticle(this.getParticleType(), this.getX() + f4, this.getY(), this.getZ() + f5, 0.0, 0.0, 0.0);
            }

            this.playSound(this.getSquishSound(), this.getSoundVolume(), ((this.random.nextFloat() - this.random.nextFloat()) * 0.2F + 1.0F) / 0.8F);
            this.targetSquish = -0.5F;
        } else if (!this.onGround() && this.wasOnGround) {
            this.targetSquish = 1.0F;
        }

        this.wasOnGround = this.onGround();
        this.decreaseSquish();
    }

    protected void decreaseSquish() {
        this.targetSquish *= 0.6F;
    }

    protected int getJumpDelay() {
        return this.random.nextInt(20) + 10;
    }

    @Override
    public void refreshDimensions() {
        double d0 = this.getX();
        double d1 = this.getY();
        double d2 = this.getZ();
        super.refreshDimensions();
        this.setPos(d0, d1, d2);
    }

    @Override
    public void onSyncedDataUpdated(EntityDataAccessor<?> p_33609_) {
        if (ID_SIZE.equals(p_33609_)) {
            this.refreshDimensions();
            this.setYRot(this.yHeadRot);
            this.yBodyRot = this.yHeadRot;
            if (this.isInWater() && this.random.nextInt(20) == 0) {
                this.doWaterSplashEffect();
            }
        }

        super.onSyncedDataUpdated(p_33609_);
    }

    @Override
    public EntityType<? extends Slime> getType() {
        return (EntityType<? extends Slime>)super.getType();
    }

    @Override
    public void remove(Entity.RemovalReason p_149847_) {
        int i = this.getSize();
        if (!this.level().isClientSide && i > 1 && this.isDeadOrDying()) {
            float f = this.getDimensions(this.getPose()).width();
            float f1 = f / 2.0F;
            int j = i / 2;
            int k = 2 + this.random.nextInt(3);
            PlayerTeam playerteam = this.getTeam();

            for (int l = 0; l < k; l++) {
                float f2 = (l % 2 - 0.5F) * f1;
                float f3 = (l / 2 - 0.5F) * f1;
                this.convertTo(
                    this.getType(), new ConversionParams(ConversionType.SPLIT_ON_DEATH, false, false, playerteam), EntitySpawnReason.TRIGGERED, p_375140_ -> {
                        p_375140_.setSize(j, true);
                        p_375140_.snapTo(this.getX() + f2, this.getY() + 0.5, this.getZ() + f3, this.random.nextFloat() * 360.0F, 0.0F);
                    }
                );
            }
        }

        super.remove(p_149847_);
    }

    @Override
    public void push(Entity p_33636_) {
        super.push(p_33636_);
        if (p_33636_ instanceof IronGolem && this.isDealsDamage()) {
            this.dealDamage((LivingEntity)p_33636_);
        }
    }

    @Override
    public void playerTouch(Player p_33611_) {
        if (this.isDealsDamage()) {
            this.dealDamage(p_33611_);
        }
    }

    protected void dealDamage(LivingEntity p_33638_) {
        if (this.level() instanceof ServerLevel serverlevel && this.isAlive() && this.isWithinMeleeAttackRange(p_33638_) && this.hasLineOfSight(p_33638_)) {
            DamageSource damagesource = this.damageSources().mobAttack(this);
            if (p_33638_.hurtServer(serverlevel, damagesource, this.getAttackDamage())) {
                this.playSound(SoundEvents.SLIME_ATTACK, 1.0F, (this.random.nextFloat() - this.random.nextFloat()) * 0.2F + 1.0F);
                EnchantmentHelper.doPostAttackEffects(serverlevel, p_33638_, damagesource);
            }
        }
    }

    @Override
    protected Vec3 getPassengerAttachmentPoint(Entity p_298024_, EntityDimensions p_298393_, float p_298662_) {
        return new Vec3(0.0, p_298393_.height() - 0.015625 * this.getSize() * p_298662_, 0.0);
    }

    protected boolean isDealsDamage() {
        return !this.isTiny() && this.isEffectiveAi();
    }

    protected float getAttackDamage() {
        return (float)this.getAttributeValue(Attributes.ATTACK_DAMAGE);
    }

    @Override
    protected SoundEvent getHurtSound(DamageSource p_33631_) {
        return this.isTiny() ? SoundEvents.SLIME_HURT_SMALL : SoundEvents.SLIME_HURT;
    }

    @Override
    protected SoundEvent getDeathSound() {
        return this.isTiny() ? SoundEvents.SLIME_DEATH_SMALL : SoundEvents.SLIME_DEATH;
    }

    protected SoundEvent getSquishSound() {
        return this.isTiny() ? SoundEvents.SLIME_SQUISH_SMALL : SoundEvents.SLIME_SQUISH;
    }

    public static boolean checkSlimeSpawnRules(
        EntityType<Slime> p_219113_, LevelAccessor p_219114_, EntitySpawnReason p_369328_, BlockPos p_219116_, RandomSource p_219117_
    ) {
        if (p_219114_.getDifficulty() != Difficulty.PEACEFUL) {
            if (EntitySpawnReason.isSpawner(p_369328_)) {
                return checkMobSpawnRules(p_219113_, p_219114_, p_369328_, p_219116_, p_219117_);
            }

            if (p_219114_.getBiome(p_219116_).is(BiomeTags.ALLOWS_SURFACE_SLIME_SPAWNS)
                && p_219116_.getY() > 50
                && p_219116_.getY() < 70
                && p_219117_.nextFloat() < 0.5F
                && p_219117_.nextFloat() < p_219114_.getMoonBrightness()
                && p_219114_.getMaxLocalRawBrightness(p_219116_) <= p_219117_.nextInt(8)) {
                return checkMobSpawnRules(p_219113_, p_219114_, p_369328_, p_219116_, p_219117_);
            }

            if (!(p_219114_ instanceof WorldGenLevel)) {
                return false;
            }

            ChunkPos chunkpos = new ChunkPos(p_219116_);
            boolean flag = WorldgenRandom.seedSlimeChunk(chunkpos.x, chunkpos.z, ((WorldGenLevel)p_219114_).getSeed(), 987234911L).nextInt(10) == 0;
            if (p_219117_.nextInt(10) == 0 && flag && p_219116_.getY() < 40) {
                return checkMobSpawnRules(p_219113_, p_219114_, p_369328_, p_219116_, p_219117_);
            }
        }

        return false;
    }

    @Override
    protected float getSoundVolume() {
        return 0.4F * this.getSize();
    }

    @Override
    public int getMaxHeadXRot() {
        return 0;
    }

    protected boolean doPlayJumpSound() {
        return this.getSize() > 0;
    }

    @Override
    public void jumpFromGround() {
        Vec3 vec3 = this.getDeltaMovement();
        this.setDeltaMovement(vec3.x, this.getJumpPower(), vec3.z);
        this.hasImpulse = true;
    }

    @Nullable
    @Override
    public SpawnGroupData finalizeSpawn(ServerLevelAccessor p_33601_, DifficultyInstance p_33602_, EntitySpawnReason p_364449_, @Nullable SpawnGroupData p_33604_) {
        RandomSource randomsource = p_33601_.getRandom();
        int i = randomsource.nextInt(3);
        if (i < 2 && randomsource.nextFloat() < 0.5F * p_33602_.getSpecialMultiplier()) {
            i++;
        }

        int j = 1 << i;
        this.setSize(j, true);
        return super.finalizeSpawn(p_33601_, p_33602_, p_364449_, p_33604_);
    }

    float getSoundPitch() {
        float f = this.isTiny() ? 1.4F : 0.8F;
        return ((this.random.nextFloat() - this.random.nextFloat()) * 0.2F + 1.0F) * f;
    }

    protected SoundEvent getJumpSound() {
        return this.isTiny() ? SoundEvents.SLIME_JUMP_SMALL : SoundEvents.SLIME_JUMP;
    }

    @Override
    public EntityDimensions getDefaultDimensions(Pose p_336379_) {
        return super.getDefaultDimensions(p_336379_).scale(this.getSize());
    }

    static class SlimeAttackGoal extends Goal {
        private final Slime slime;
        private int growTiredTimer;

        public SlimeAttackGoal(Slime p_33648_) {
            this.slime = p_33648_;
            this.setFlags(EnumSet.of(Goal.Flag.LOOK));
        }

        @Override
        public boolean canUse() {
            LivingEntity livingentity = this.slime.getTarget();
            if (livingentity == null) {
                return false;
            } else {
                return !this.slime.canAttack(livingentity) ? false : this.slime.getMoveControl() instanceof Slime.SlimeMoveControl;
            }
        }

        @Override
        public void start() {
            this.growTiredTimer = reducedTickDelay(300);
            super.start();
        }

        @Override
        public boolean canContinueToUse() {
            LivingEntity livingentity = this.slime.getTarget();
            if (livingentity == null) {
                return false;
            } else {
                return !this.slime.canAttack(livingentity) ? false : --this.growTiredTimer > 0;
            }
        }

        @Override
        public boolean requiresUpdateEveryTick() {
            return true;
        }

        @Override
        public void tick() {
            LivingEntity livingentity = this.slime.getTarget();
            if (livingentity != null) {
                this.slime.lookAt(livingentity, 10.0F, 10.0F);
            }

            if (this.slime.getMoveControl() instanceof Slime.SlimeMoveControl slime$slimemovecontrol) {
                slime$slimemovecontrol.setDirection(this.slime.getYRot(), this.slime.isDealsDamage());
            }
        }
    }

    static class SlimeFloatGoal extends Goal {
        private final Slime slime;

        public SlimeFloatGoal(Slime p_33655_) {
            this.slime = p_33655_;
            this.setFlags(EnumSet.of(Goal.Flag.JUMP, Goal.Flag.MOVE));
            p_33655_.getNavigation().setCanFloat(true);
        }

        @Override
        public boolean canUse() {
            return (this.slime.isInWater() || this.slime.isInLava()) && this.slime.getMoveControl() instanceof Slime.SlimeMoveControl;
        }

        @Override
        public boolean requiresUpdateEveryTick() {
            return true;
        }

        @Override
        public void tick() {
            if (this.slime.getRandom().nextFloat() < 0.8F) {
                this.slime.getJumpControl().jump();
            }

            if (this.slime.getMoveControl() instanceof Slime.SlimeMoveControl slime$slimemovecontrol) {
                slime$slimemovecontrol.setWantedMovement(1.2);
            }
        }
    }

    static class SlimeKeepOnJumpingGoal extends Goal {
        private final Slime slime;

        public SlimeKeepOnJumpingGoal(Slime p_33660_) {
            this.slime = p_33660_;
            this.setFlags(EnumSet.of(Goal.Flag.JUMP, Goal.Flag.MOVE));
        }

        @Override
        public boolean canUse() {
            return !this.slime.isPassenger();
        }

        @Override
        public void tick() {
            if (this.slime.getMoveControl() instanceof Slime.SlimeMoveControl slime$slimemovecontrol) {
                slime$slimemovecontrol.setWantedMovement(1.0);
            }
        }
    }

    static class SlimeMoveControl extends MoveControl {
        private float yRot;
        private int jumpDelay;
        private final Slime slime;
        private boolean isAggressive;

        public SlimeMoveControl(Slime p_33668_) {
            super(p_33668_);
            this.slime = p_33668_;
            this.yRot = 180.0F * p_33668_.getYRot() / (float) Math.PI;
        }

        public void setDirection(float p_33673_, boolean p_33674_) {
            this.yRot = p_33673_;
            this.isAggressive = p_33674_;
        }

        public void setWantedMovement(double p_33671_) {
            this.speedModifier = p_33671_;
            this.operation = MoveControl.Operation.MOVE_TO;
        }

        @Override
        public void tick() {
            this.mob.setYRot(this.rotlerp(this.mob.getYRot(), this.yRot, 90.0F));
            this.mob.yHeadRot = this.mob.getYRot();
            this.mob.yBodyRot = this.mob.getYRot();
            if (this.operation != MoveControl.Operation.MOVE_TO) {
                this.mob.setZza(0.0F);
            } else {
                this.operation = MoveControl.Operation.WAIT;
                if (this.mob.onGround()) {
                    this.mob.setSpeed((float)(this.speedModifier * this.mob.getAttributeValue(Attributes.MOVEMENT_SPEED)));
                    if (this.jumpDelay-- <= 0) {
                        this.jumpDelay = this.slime.getJumpDelay();
                        if (this.isAggressive) {
                            this.jumpDelay /= 3;
                        }

                        this.slime.getJumpControl().jump();
                        if (this.slime.doPlayJumpSound()) {
                            this.slime.playSound(this.slime.getJumpSound(), this.slime.getSoundVolume(), this.slime.getSoundPitch());
                        }
                    } else {
                        this.slime.xxa = 0.0F;
                        this.slime.zza = 0.0F;
                        this.mob.setSpeed(0.0F);
                    }
                } else {
                    this.mob.setSpeed((float)(this.speedModifier * this.mob.getAttributeValue(Attributes.MOVEMENT_SPEED)));
                }
            }
        }
    }

    static class SlimeRandomDirectionGoal extends Goal {
        private final Slime slime;
        private float chosenDegrees;
        private int nextRandomizeTime;

        public SlimeRandomDirectionGoal(Slime p_33679_) {
            this.slime = p_33679_;
            this.setFlags(EnumSet.of(Goal.Flag.LOOK));
        }

        @Override
        public boolean canUse() {
            return this.slime.getTarget() == null
                && (this.slime.onGround() || this.slime.isInWater() || this.slime.isInLava() || this.slime.hasEffect(MobEffects.LEVITATION))
                && this.slime.getMoveControl() instanceof Slime.SlimeMoveControl;
        }

        @Override
        public void tick() {
            if (--this.nextRandomizeTime <= 0) {
                this.nextRandomizeTime = this.adjustedTickDelay(40 + this.slime.getRandom().nextInt(60));
                this.chosenDegrees = this.slime.getRandom().nextInt(360);
            }

            if (this.slime.getMoveControl() instanceof Slime.SlimeMoveControl slime$slimemovecontrol) {
                slime$slimemovecontrol.setDirection(this.chosenDegrees, false);
            }
        }
    }
}