minecraft-src/net/minecraft/world/entity/item/PrimedTnt.java

package net.minecraft.world.entity.item;

import java.util.Optional;
import net.minecraft.core.BlockPos;
import net.minecraft.core.particles.ParticleTypes;
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.util.Mth;
import net.minecraft.world.damagesource.DamageSource;
import net.minecraft.world.entity.Entity;
import net.minecraft.world.entity.EntityReference;
import net.minecraft.world.entity.EntityType;
import net.minecraft.world.entity.LivingEntity;
import net.minecraft.world.entity.MoverType;
import net.minecraft.world.entity.TraceableEntity;
import net.minecraft.world.level.BlockGetter;
import net.minecraft.world.level.Explosion;
import net.minecraft.world.level.ExplosionDamageCalculator;
import net.minecraft.world.level.GameRules;
import net.minecraft.world.level.Level;
import net.minecraft.world.level.block.Blocks;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.level.material.FluidState;
import net.minecraft.world.level.portal.TeleportTransition;
import net.minecraft.world.level.storage.ValueInput;
import net.minecraft.world.level.storage.ValueOutput;
import org.jetbrains.annotations.Nullable;

public class PrimedTnt extends Entity implements TraceableEntity {
	private static final EntityDataAccessor<Integer> DATA_FUSE_ID = SynchedEntityData.defineId(PrimedTnt.class, EntityDataSerializers.INT);
	private static final EntityDataAccessor<BlockState> DATA_BLOCK_STATE_ID = SynchedEntityData.defineId(PrimedTnt.class, EntityDataSerializers.BLOCK_STATE);
	private static final short DEFAULT_FUSE_TIME = 80;
	private static final float DEFAULT_EXPLOSION_POWER = 4.0F;
	private static final BlockState DEFAULT_BLOCK_STATE = Blocks.TNT.defaultBlockState();
	private static final String TAG_BLOCK_STATE = "block_state";
	public static final String TAG_FUSE = "fuse";
	private static final String TAG_EXPLOSION_POWER = "explosion_power";
	private static final ExplosionDamageCalculator USED_PORTAL_DAMAGE_CALCULATOR = new ExplosionDamageCalculator() {
		@Override
		public boolean shouldBlockExplode(Explosion explosion, BlockGetter reader, BlockPos pos, BlockState state, float power) {
			return state.is(Blocks.NETHER_PORTAL) ? false : super.shouldBlockExplode(explosion, reader, pos, state, power);
		}

		@Override
		public Optional<Float> getBlockExplosionResistance(Explosion explosion, BlockGetter reader, BlockPos pos, BlockState state, FluidState fluid) {
			return state.is(Blocks.NETHER_PORTAL) ? Optional.empty() : super.getBlockExplosionResistance(explosion, reader, pos, state, fluid);
		}
	};
	@Nullable
	private EntityReference<LivingEntity> owner;
	private boolean usedPortal;
	private float explosionPower = 4.0F;

	public PrimedTnt(EntityType<? extends PrimedTnt> entityType, Level level) {
		super(entityType, level);
		this.blocksBuilding = true;
	}

	public PrimedTnt(Level level, double x, double y, double z, @Nullable LivingEntity owner) {
		this(EntityType.TNT, level);
		this.setPos(x, y, z);
		double d = level.random.nextDouble() * (float) (Math.PI * 2);
		this.setDeltaMovement(-Math.sin(d) * 0.02, 0.2F, -Math.cos(d) * 0.02);
		this.setFuse(80);
		this.xo = x;
		this.yo = y;
		this.zo = z;
		this.owner = owner != null ? new EntityReference<>(owner) : null;
	}

	@Override
	protected void defineSynchedData(SynchedEntityData.Builder builder) {
		builder.define(DATA_FUSE_ID, 80);
		builder.define(DATA_BLOCK_STATE_ID, DEFAULT_BLOCK_STATE);
	}

	@Override
	protected Entity.MovementEmission getMovementEmission() {
		return Entity.MovementEmission.NONE;
	}

	@Override
	public boolean isPickable() {
		return !this.isRemoved();
	}

	@Override
	protected double getDefaultGravity() {
		return 0.04;
	}

	@Override
	public void tick() {
		this.handlePortal();
		this.applyGravity();
		this.move(MoverType.SELF, this.getDeltaMovement());
		this.applyEffectsFromBlocks();
		this.setDeltaMovement(this.getDeltaMovement().scale(0.98));
		if (this.onGround()) {
			this.setDeltaMovement(this.getDeltaMovement().multiply(0.7, -0.5, 0.7));
		}

		int i = this.getFuse() - 1;
		this.setFuse(i);
		if (i <= 0) {
			this.discard();
			if (!this.level().isClientSide) {
				this.explode();
			}
		} else {
			this.updateInWaterStateAndDoFluidPushing();
			if (this.level().isClientSide) {
				this.level().addParticle(ParticleTypes.SMOKE, this.getX(), this.getY() + 0.5, this.getZ(), 0.0, 0.0, 0.0);
			}
		}
	}

	private void explode() {
		if (this.level() instanceof ServerLevel serverLevel && serverLevel.getGameRules().getBoolean(GameRules.RULE_TNT_EXPLODES)) {
			this.level()
				.explode(
					this,
					Explosion.getDefaultDamageSource(this.level(), this),
					this.usedPortal ? USED_PORTAL_DAMAGE_CALCULATOR : null,
					this.getX(),
					this.getY(0.0625),
					this.getZ(),
					this.explosionPower,
					false,
					Level.ExplosionInteraction.TNT
				);
		}
	}

	@Override
	protected void addAdditionalSaveData(ValueOutput output) {
		output.putShort("fuse", (short)this.getFuse());
		output.store("block_state", BlockState.CODEC, this.getBlockState());
		if (this.explosionPower != 4.0F) {
			output.putFloat("explosion_power", this.explosionPower);
		}

		EntityReference.store(this.owner, output, "owner");
	}

	@Override
	protected void readAdditionalSaveData(ValueInput input) {
		this.setFuse(input.getShortOr("fuse", (short)80));
		this.setBlockState((BlockState)input.read("block_state", BlockState.CODEC).orElse(DEFAULT_BLOCK_STATE));
		this.explosionPower = Mth.clamp(input.getFloatOr("explosion_power", 4.0F), 0.0F, 128.0F);
		this.owner = EntityReference.read(input, "owner");
	}

	/**
	 * Returns null or the entityliving it was ignited by
	 */
	@Nullable
	public LivingEntity getOwner() {
		return (LivingEntity)EntityReference.get(this.owner, this.level(), LivingEntity.class);
	}

	@Override
	public void restoreFrom(Entity entity) {
		super.restoreFrom(entity);
		if (entity instanceof PrimedTnt primedTnt) {
			this.owner = primedTnt.owner;
		}
	}

	public void setFuse(int life) {
		this.entityData.set(DATA_FUSE_ID, life);
	}

	/**
	 * Gets the fuse from the data manager
	 */
	public int getFuse() {
		return this.entityData.get(DATA_FUSE_ID);
	}

	public void setBlockState(BlockState blockState) {
		this.entityData.set(DATA_BLOCK_STATE_ID, blockState);
	}

	public BlockState getBlockState() {
		return this.entityData.get(DATA_BLOCK_STATE_ID);
	}

	private void setUsedPortal(boolean usedPortal) {
		this.usedPortal = usedPortal;
	}

	@Nullable
	@Override
	public Entity teleport(TeleportTransition teleportTransition) {
		Entity entity = super.teleport(teleportTransition);
		if (entity instanceof PrimedTnt primedTnt) {
			primedTnt.setUsedPortal(true);
		}

		return entity;
	}

	@Override
	public final boolean hurtServer(ServerLevel level, DamageSource damageSource, float amount) {
		return false;
	}
}