minecraft-src/net/minecraft/world/entity/animal/frog/ShootTongue.java

package net.minecraft.world.entity.animal.frog;

import com.google.common.collect.ImmutableMap;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import java.util.UUID;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.sounds.SoundEvent;
import net.minecraft.sounds.SoundSource;
import net.minecraft.world.entity.Entity;
import net.minecraft.world.entity.LivingEntity;
import net.minecraft.world.entity.Pose;
import net.minecraft.world.entity.ai.behavior.Behavior;
import net.minecraft.world.entity.ai.behavior.BehaviorUtils;
import net.minecraft.world.entity.ai.memory.MemoryModuleType;
import net.minecraft.world.entity.ai.memory.MemoryStatus;
import net.minecraft.world.entity.ai.memory.WalkTarget;
import net.minecraft.world.level.pathfinder.Path;
import net.minecraft.world.phys.Vec3;

public class ShootTongue extends Behavior<Frog> {
	public static final int TIME_OUT_DURATION = 100;
	public static final int CATCH_ANIMATION_DURATION = 6;
	public static final int TONGUE_ANIMATION_DURATION = 10;
	private static final float EATING_DISTANCE = 1.75F;
	private static final float EATING_MOVEMENT_FACTOR = 0.75F;
	public static final int UNREACHABLE_TONGUE_TARGETS_COOLDOWN_DURATION = 100;
	public static final int MAX_UNREACHBLE_TONGUE_TARGETS_IN_MEMORY = 5;
	private int eatAnimationTimer;
	private int calculatePathCounter;
	private final SoundEvent tongueSound;
	private final SoundEvent eatSound;
	private Vec3 itemSpawnPos;
	private ShootTongue.State state = ShootTongue.State.DONE;

	public ShootTongue(SoundEvent tongueSound, SoundEvent eatSound) {
		super(
			ImmutableMap.of(
				MemoryModuleType.WALK_TARGET,
				MemoryStatus.VALUE_ABSENT,
				MemoryModuleType.LOOK_TARGET,
				MemoryStatus.REGISTERED,
				MemoryModuleType.ATTACK_TARGET,
				MemoryStatus.VALUE_PRESENT,
				MemoryModuleType.IS_PANICKING,
				MemoryStatus.VALUE_ABSENT
			),
			100
		);
		this.tongueSound = tongueSound;
		this.eatSound = eatSound;
	}

	protected boolean checkExtraStartConditions(ServerLevel level, Frog owner) {
		LivingEntity livingEntity = (LivingEntity)owner.getBrain().getMemory(MemoryModuleType.ATTACK_TARGET).get();
		boolean bl = this.canPathfindToTarget(owner, livingEntity);
		if (!bl) {
			owner.getBrain().eraseMemory(MemoryModuleType.ATTACK_TARGET);
			this.addUnreachableTargetToMemory(owner, livingEntity);
		}

		return bl && owner.getPose() != Pose.CROAKING && Frog.canEat(livingEntity);
	}

	protected boolean canStillUse(ServerLevel level, Frog entity, long gameTime) {
		return entity.getBrain().hasMemoryValue(MemoryModuleType.ATTACK_TARGET)
			&& this.state != ShootTongue.State.DONE
			&& !entity.getBrain().hasMemoryValue(MemoryModuleType.IS_PANICKING);
	}

	protected void start(ServerLevel level, Frog entity, long gameTime) {
		LivingEntity livingEntity = (LivingEntity)entity.getBrain().getMemory(MemoryModuleType.ATTACK_TARGET).get();
		BehaviorUtils.lookAtEntity(entity, livingEntity);
		entity.setTongueTarget(livingEntity);
		entity.getBrain().setMemory(MemoryModuleType.WALK_TARGET, new WalkTarget(livingEntity.position(), 2.0F, 0));
		this.calculatePathCounter = 10;
		this.state = ShootTongue.State.MOVE_TO_TARGET;
	}

	protected void stop(ServerLevel level, Frog entity, long gameTime) {
		entity.getBrain().eraseMemory(MemoryModuleType.ATTACK_TARGET);
		entity.eraseTongueTarget();
		entity.setPose(Pose.STANDING);
	}

	private void eatEntity(ServerLevel level, Frog frog) {
		level.playSound(null, frog, this.eatSound, SoundSource.NEUTRAL, 2.0F, 1.0F);
		Optional<Entity> optional = frog.getTongueTarget();
		if (optional.isPresent()) {
			Entity entity = (Entity)optional.get();
			if (entity.isAlive()) {
				frog.doHurtTarget(level, entity);
				if (!entity.isAlive()) {
					entity.remove(Entity.RemovalReason.KILLED);
				}
			}
		}
	}

	protected void tick(ServerLevel level, Frog owner, long gameTime) {
		LivingEntity livingEntity = (LivingEntity)owner.getBrain().getMemory(MemoryModuleType.ATTACK_TARGET).get();
		owner.setTongueTarget(livingEntity);
		switch (this.state) {
			case MOVE_TO_TARGET:
				if (livingEntity.distanceTo(owner) < 1.75F) {
					level.playSound(null, owner, this.tongueSound, SoundSource.NEUTRAL, 2.0F, 1.0F);
					owner.setPose(Pose.USING_TONGUE);
					livingEntity.setDeltaMovement(livingEntity.position().vectorTo(owner.position()).normalize().scale(0.75));
					this.itemSpawnPos = livingEntity.position();
					this.eatAnimationTimer = 0;
					this.state = ShootTongue.State.CATCH_ANIMATION;
				} else if (this.calculatePathCounter <= 0) {
					owner.getBrain().setMemory(MemoryModuleType.WALK_TARGET, new WalkTarget(livingEntity.position(), 2.0F, 0));
					this.calculatePathCounter = 10;
				} else {
					this.calculatePathCounter--;
				}
				break;
			case CATCH_ANIMATION:
				if (this.eatAnimationTimer++ >= 6) {
					this.state = ShootTongue.State.EAT_ANIMATION;
					this.eatEntity(level, owner);
				}
				break;
			case EAT_ANIMATION:
				if (this.eatAnimationTimer >= 10) {
					this.state = ShootTongue.State.DONE;
				} else {
					this.eatAnimationTimer++;
				}
			case DONE:
		}
	}

	private boolean canPathfindToTarget(Frog frog, LivingEntity target) {
		Path path = frog.getNavigation().createPath(target, 0);
		return path != null && path.getDistToTarget() < 1.75F;
	}

	private void addUnreachableTargetToMemory(Frog frog, LivingEntity target) {
		List<UUID> list = (List<UUID>)frog.getBrain().getMemory(MemoryModuleType.UNREACHABLE_TONGUE_TARGETS).orElseGet(ArrayList::new);
		boolean bl = !list.contains(target.getUUID());
		if (list.size() == 5 && bl) {
			list.remove(0);
		}

		if (bl) {
			list.add(target.getUUID());
		}

		frog.getBrain().setMemoryWithExpiry(MemoryModuleType.UNREACHABLE_TONGUE_TARGETS, list, 100L);
	}

	static enum State {
		MOVE_TO_TARGET,
		CATCH_ANIMATION,
		EAT_ANIMATION,
		DONE;
	}
}