minecraft-src/net/minecraft/world/entity/ai/behavior/GiveGiftToHero.java

package net.minecraft.world.entity.ai.behavior;

import com.google.common.collect.ImmutableMap;
import java.util.Map;
import java.util.Optional;
import net.minecraft.core.BlockPos;
import net.minecraft.resources.ResourceKey;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.world.effect.MobEffects;
import net.minecraft.world.entity.LivingEntity;
import net.minecraft.world.entity.ai.memory.MemoryModuleType;
import net.minecraft.world.entity.ai.memory.MemoryStatus;
import net.minecraft.world.entity.npc.Villager;
import net.minecraft.world.entity.npc.VillagerProfession;
import net.minecraft.world.entity.player.Player;
import net.minecraft.world.level.storage.loot.BuiltInLootTables;
import net.minecraft.world.level.storage.loot.LootTable;

public class GiveGiftToHero extends Behavior<Villager> {
	private static final int THROW_GIFT_AT_DISTANCE = 5;
	private static final int MIN_TIME_BETWEEN_GIFTS = 600;
	private static final int MAX_TIME_BETWEEN_GIFTS = 6600;
	private static final int TIME_TO_DELAY_FOR_HEAD_TO_FINISH_TURNING = 20;
	private static final Map<ResourceKey<VillagerProfession>, ResourceKey<LootTable>> GIFTS = ImmutableMap.<ResourceKey<VillagerProfession>, ResourceKey<LootTable>>builder()
		.put(VillagerProfession.ARMORER, BuiltInLootTables.ARMORER_GIFT)
		.put(VillagerProfession.BUTCHER, BuiltInLootTables.BUTCHER_GIFT)
		.put(VillagerProfession.CARTOGRAPHER, BuiltInLootTables.CARTOGRAPHER_GIFT)
		.put(VillagerProfession.CLERIC, BuiltInLootTables.CLERIC_GIFT)
		.put(VillagerProfession.FARMER, BuiltInLootTables.FARMER_GIFT)
		.put(VillagerProfession.FISHERMAN, BuiltInLootTables.FISHERMAN_GIFT)
		.put(VillagerProfession.FLETCHER, BuiltInLootTables.FLETCHER_GIFT)
		.put(VillagerProfession.LEATHERWORKER, BuiltInLootTables.LEATHERWORKER_GIFT)
		.put(VillagerProfession.LIBRARIAN, BuiltInLootTables.LIBRARIAN_GIFT)
		.put(VillagerProfession.MASON, BuiltInLootTables.MASON_GIFT)
		.put(VillagerProfession.SHEPHERD, BuiltInLootTables.SHEPHERD_GIFT)
		.put(VillagerProfession.TOOLSMITH, BuiltInLootTables.TOOLSMITH_GIFT)
		.put(VillagerProfession.WEAPONSMITH, BuiltInLootTables.WEAPONSMITH_GIFT)
		.build();
	private static final float SPEED_MODIFIER = 0.5F;
	private int timeUntilNextGift = 600;
	private boolean giftGivenDuringThisRun;
	private long timeSinceStart;

	public GiveGiftToHero(int duration) {
		super(
			ImmutableMap.of(
				MemoryModuleType.WALK_TARGET,
				MemoryStatus.REGISTERED,
				MemoryModuleType.LOOK_TARGET,
				MemoryStatus.REGISTERED,
				MemoryModuleType.INTERACTION_TARGET,
				MemoryStatus.REGISTERED,
				MemoryModuleType.NEAREST_VISIBLE_PLAYER,
				MemoryStatus.VALUE_PRESENT
			),
			duration
		);
	}

	protected boolean checkExtraStartConditions(ServerLevel level, Villager owner) {
		if (!this.isHeroVisible(owner)) {
			return false;
		} else if (this.timeUntilNextGift > 0) {
			this.timeUntilNextGift--;
			return false;
		} else {
			return true;
		}
	}

	protected void start(ServerLevel level, Villager entity, long gameTime) {
		this.giftGivenDuringThisRun = false;
		this.timeSinceStart = gameTime;
		Player player = (Player)this.getNearestTargetableHero(entity).get();
		entity.getBrain().setMemory(MemoryModuleType.INTERACTION_TARGET, player);
		BehaviorUtils.lookAtEntity(entity, player);
	}

	protected boolean canStillUse(ServerLevel level, Villager entity, long gameTime) {
		return this.isHeroVisible(entity) && !this.giftGivenDuringThisRun;
	}

	protected void tick(ServerLevel level, Villager owner, long gameTime) {
		Player player = (Player)this.getNearestTargetableHero(owner).get();
		BehaviorUtils.lookAtEntity(owner, player);
		if (this.isWithinThrowingDistance(owner, player)) {
			if (gameTime - this.timeSinceStart > 20L) {
				this.throwGift(level, owner, player);
				this.giftGivenDuringThisRun = true;
			}
		} else {
			BehaviorUtils.setWalkAndLookTargetMemories(owner, player, 0.5F, 5);
		}
	}

	protected void stop(ServerLevel level, Villager entity, long gameTime) {
		this.timeUntilNextGift = calculateTimeUntilNextGift(level);
		entity.getBrain().eraseMemory(MemoryModuleType.INTERACTION_TARGET);
		entity.getBrain().eraseMemory(MemoryModuleType.WALK_TARGET);
		entity.getBrain().eraseMemory(MemoryModuleType.LOOK_TARGET);
	}

	private void throwGift(ServerLevel level, Villager villager, LivingEntity target) {
		villager.dropFromGiftLootTable(
			level, getLootTableToThrow(villager), (serverLevel, itemStack) -> BehaviorUtils.throwItem(villager, itemStack, target.position())
		);
	}

	private static ResourceKey<LootTable> getLootTableToThrow(Villager villager) {
		if (villager.isBaby()) {
			return BuiltInLootTables.BABY_VILLAGER_GIFT;
		} else {
			Optional<ResourceKey<VillagerProfession>> optional = villager.getVillagerData().profession().unwrapKey();
			return optional.isEmpty() ? BuiltInLootTables.UNEMPLOYED_GIFT : (ResourceKey)GIFTS.getOrDefault(optional.get(), BuiltInLootTables.UNEMPLOYED_GIFT);
		}
	}

	private boolean isHeroVisible(Villager villager) {
		return this.getNearestTargetableHero(villager).isPresent();
	}

	private Optional<Player> getNearestTargetableHero(Villager villager) {
		return villager.getBrain().getMemory(MemoryModuleType.NEAREST_VISIBLE_PLAYER).filter(this::isHero);
	}

	private boolean isHero(Player player) {
		return player.hasEffect(MobEffects.HERO_OF_THE_VILLAGE);
	}

	private boolean isWithinThrowingDistance(Villager villager, Player hero) {
		BlockPos blockPos = hero.blockPosition();
		BlockPos blockPos2 = villager.blockPosition();
		return blockPos2.closerThan(blockPos, 5.0);
	}

	private static int calculateTimeUntilNextGift(ServerLevel level) {
		return 600 + level.random.nextInt(6001);
	}
}