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

package net.minecraft.world.entity.monster;

import java.time.LocalDate;
import java.time.temporal.ChronoField;
import javax.annotation.Nullable;
import net.minecraft.core.BlockPos;
import net.minecraft.nbt.CompoundTag;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.sounds.SoundEvent;
import net.minecraft.sounds.SoundEvents;
import net.minecraft.tags.ItemTags;
import net.minecraft.tags.TagKey;
import net.minecraft.util.RandomSource;
import net.minecraft.world.Difficulty;
import net.minecraft.world.DifficultyInstance;
import net.minecraft.world.entity.EntitySpawnReason;
import net.minecraft.world.entity.EntityType;
import net.minecraft.world.entity.EquipmentSlot;
import net.minecraft.world.entity.LivingEntity;
import net.minecraft.world.entity.PathfinderMob;
import net.minecraft.world.entity.SpawnGroupData;
import net.minecraft.world.entity.ai.attributes.AttributeSupplier;
import net.minecraft.world.entity.ai.attributes.Attributes;
import net.minecraft.world.entity.ai.goal.AvoidEntityGoal;
import net.minecraft.world.entity.ai.goal.FleeSunGoal;
import net.minecraft.world.entity.ai.goal.LookAtPlayerGoal;
import net.minecraft.world.entity.ai.goal.MeleeAttackGoal;
import net.minecraft.world.entity.ai.goal.RandomLookAroundGoal;
import net.minecraft.world.entity.ai.goal.RangedBowAttackGoal;
import net.minecraft.world.entity.ai.goal.RestrictSunGoal;
import net.minecraft.world.entity.ai.goal.WaterAvoidingRandomStrollGoal;
import net.minecraft.world.entity.ai.goal.target.HurtByTargetGoal;
import net.minecraft.world.entity.ai.goal.target.NearestAttackableTargetGoal;
import net.minecraft.world.entity.animal.IronGolem;
import net.minecraft.world.entity.animal.Turtle;
import net.minecraft.world.entity.animal.wolf.Wolf;
import net.minecraft.world.entity.player.Player;
import net.minecraft.world.entity.projectile.AbstractArrow;
import net.minecraft.world.entity.projectile.Projectile;
import net.minecraft.world.entity.projectile.ProjectileUtil;
import net.minecraft.world.item.Item;
import net.minecraft.world.item.ItemStack;
import net.minecraft.world.item.Items;
import net.minecraft.world.item.ProjectileWeaponItem;
import net.minecraft.world.level.Level;
import net.minecraft.world.level.ServerLevelAccessor;
import net.minecraft.world.level.block.Blocks;
import net.minecraft.world.level.block.state.BlockState;

public abstract class AbstractSkeleton extends Monster implements RangedAttackMob {
    private static final int HARD_ATTACK_INTERVAL = 20;
    private static final int NORMAL_ATTACK_INTERVAL = 40;
    private final RangedBowAttackGoal<AbstractSkeleton> bowGoal = new RangedBowAttackGoal<>(this, 1.0, 20, 15.0F);
    private final MeleeAttackGoal meleeGoal = new MeleeAttackGoal(this, 1.2, false) {
        @Override
        public void stop() {
            super.stop();
            AbstractSkeleton.this.setAggressive(false);
        }

        @Override
        public void start() {
            super.start();
            AbstractSkeleton.this.setAggressive(true);
        }
    };

    protected AbstractSkeleton(EntityType<? extends AbstractSkeleton> p_32133_, Level p_32134_) {
        super(p_32133_, p_32134_);
        this.reassessWeaponGoal();
    }

    @Override
    protected void registerGoals() {
        this.goalSelector.addGoal(2, new RestrictSunGoal(this));
        this.goalSelector.addGoal(3, new FleeSunGoal(this, 1.0));
        this.goalSelector.addGoal(3, new AvoidEntityGoal<>(this, Wolf.class, 6.0F, 1.0, 1.2));
        this.goalSelector.addGoal(5, new WaterAvoidingRandomStrollGoal(this, 1.0));
        this.goalSelector.addGoal(6, new LookAtPlayerGoal(this, Player.class, 8.0F));
        this.goalSelector.addGoal(6, new RandomLookAroundGoal(this));
        this.targetSelector.addGoal(1, new HurtByTargetGoal(this));
        this.targetSelector.addGoal(2, new NearestAttackableTargetGoal<>(this, Player.class, true));
        this.targetSelector.addGoal(3, new NearestAttackableTargetGoal<>(this, IronGolem.class, true));
        this.targetSelector.addGoal(3, new NearestAttackableTargetGoal<>(this, Turtle.class, 10, true, false, Turtle.BABY_ON_LAND_SELECTOR));
    }

    public static AttributeSupplier.Builder createAttributes() {
        return Monster.createMonsterAttributes().add(Attributes.MOVEMENT_SPEED, 0.25);
    }

    @Override
    protected void playStepSound(BlockPos p_32159_, BlockState p_32160_) {
        this.playSound(this.getStepSound(), 0.15F, 1.0F);
    }

    abstract SoundEvent getStepSound();

    @Override
    public void aiStep() {
        boolean flag = this.isSunBurnTick();
        if (flag) {
            ItemStack itemstack = this.getItemBySlot(EquipmentSlot.HEAD);
            if (!itemstack.isEmpty()) {
                if (itemstack.isDamageableItem()) {
                    Item item = itemstack.getItem();
                    itemstack.setDamageValue(itemstack.getDamageValue() + this.random.nextInt(2));
                    if (itemstack.getDamageValue() >= itemstack.getMaxDamage()) {
                        this.onEquippedItemBroken(item, EquipmentSlot.HEAD);
                        this.setItemSlot(EquipmentSlot.HEAD, ItemStack.EMPTY);
                    }
                }

                flag = false;
            }

            if (flag) {
                this.igniteForSeconds(8.0F);
            }
        }

        super.aiStep();
    }

    @Override
    public void rideTick() {
        super.rideTick();
        if (this.getControlledVehicle() instanceof PathfinderMob pathfindermob) {
            this.yBodyRot = pathfindermob.yBodyRot;
        }
    }

    @Override
    protected void populateDefaultEquipmentSlots(RandomSource p_218949_, DifficultyInstance p_218950_) {
        super.populateDefaultEquipmentSlots(p_218949_, p_218950_);
        this.setItemSlot(EquipmentSlot.MAINHAND, new ItemStack(Items.BOW));
    }

    @Nullable
    @Override
    public SpawnGroupData finalizeSpawn(ServerLevelAccessor p_32146_, DifficultyInstance p_32147_, EntitySpawnReason p_361344_, @Nullable SpawnGroupData p_32149_) {
        p_32149_ = super.finalizeSpawn(p_32146_, p_32147_, p_361344_, p_32149_);
        RandomSource randomsource = p_32146_.getRandom();
        this.populateDefaultEquipmentSlots(randomsource, p_32147_);
        this.populateDefaultEquipmentEnchantments(p_32146_, randomsource, p_32147_);
        this.reassessWeaponGoal();
        this.setCanPickUpLoot(randomsource.nextFloat() < 0.55F * p_32147_.getSpecialMultiplier());
        if (this.getItemBySlot(EquipmentSlot.HEAD).isEmpty()) {
            LocalDate localdate = LocalDate.now();
            int i = localdate.get(ChronoField.DAY_OF_MONTH);
            int j = localdate.get(ChronoField.MONTH_OF_YEAR);
            if (j == 10 && i == 31 && randomsource.nextFloat() < 0.25F) {
                this.setItemSlot(EquipmentSlot.HEAD, new ItemStack(randomsource.nextFloat() < 0.1F ? Blocks.JACK_O_LANTERN : Blocks.CARVED_PUMPKIN));
                this.setDropChance(EquipmentSlot.HEAD, 0.0F);
            }
        }

        return p_32149_;
    }

    public void reassessWeaponGoal() {
        if (this.level() != null && !this.level().isClientSide) {
            this.goalSelector.removeGoal(this.meleeGoal);
            this.goalSelector.removeGoal(this.bowGoal);
            ItemStack itemstack = this.getItemInHand(ProjectileUtil.getWeaponHoldingHand(this, Items.BOW));
            if (itemstack.is(Items.BOW)) {
                int i = this.getHardAttackInterval();
                if (this.level().getDifficulty() != Difficulty.HARD) {
                    i = this.getAttackInterval();
                }

                this.bowGoal.setMinAttackInterval(i);
                this.goalSelector.addGoal(4, this.bowGoal);
            } else {
                this.goalSelector.addGoal(4, this.meleeGoal);
            }
        }
    }

    protected int getHardAttackInterval() {
        return 20;
    }

    protected int getAttackInterval() {
        return 40;
    }

    @Override
    public void performRangedAttack(LivingEntity p_32141_, float p_32142_) {
        ItemStack itemstack = this.getItemInHand(ProjectileUtil.getWeaponHoldingHand(this, Items.BOW));
        ItemStack itemstack1 = this.getProjectile(itemstack);
        AbstractArrow abstractarrow = this.getArrow(itemstack1, p_32142_, itemstack);
        double d0 = p_32141_.getX() - this.getX();
        double d1 = p_32141_.getY(0.3333333333333333) - abstractarrow.getY();
        double d2 = p_32141_.getZ() - this.getZ();
        double d3 = Math.sqrt(d0 * d0 + d2 * d2);
        if (this.level() instanceof ServerLevel serverlevel) {
            Projectile.spawnProjectileUsingShoot(abstractarrow, serverlevel, itemstack1, d0, d1 + d3 * 0.2F, d2, 1.6F, 14 - serverlevel.getDifficulty().getId() * 4);
        }

        this.playSound(SoundEvents.SKELETON_SHOOT, 1.0F, 1.0F / (this.getRandom().nextFloat() * 0.4F + 0.8F));
    }

    protected AbstractArrow getArrow(ItemStack p_32156_, float p_32157_, @Nullable ItemStack p_343583_) {
        return ProjectileUtil.getMobArrow(this, p_32156_, p_32157_, p_343583_);
    }

    @Override
    public boolean canFireProjectileWeapon(ProjectileWeaponItem p_32144_) {
        return p_32144_ == Items.BOW;
    }

    @Override
    public TagKey<Item> getPreferredWeaponType() {
        return ItemTags.SKELETON_PREFERRED_WEAPONS;
    }

    @Override
    public void readAdditionalSaveData(CompoundTag p_32152_) {
        super.readAdditionalSaveData(p_32152_);
        this.reassessWeaponGoal();
    }

    @Override
    public void onEquipItem(EquipmentSlot p_392016_, ItemStack p_392506_, ItemStack p_396799_) {
        super.onEquipItem(p_392016_, p_392506_, p_396799_);
        if (!this.level().isClientSide) {
            this.reassessWeaponGoal();
        }
    }

    public boolean isShaking() {
        return this.isFullyFrozen();
    }
}