minecraft-src/net/minecraft/world/level/block/PowderSnowBlock.java

package net.minecraft.world.level.block;

import com.mojang.serialization.MapCodec;
import java.util.Optional;
import net.minecraft.core.BlockPos;
import net.minecraft.core.Direction;
import net.minecraft.core.particles.ParticleTypes;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.sounds.SoundEvent;
import net.minecraft.sounds.SoundEvents;
import net.minecraft.tags.EntityTypeTags;
import net.minecraft.util.Mth;
import net.minecraft.util.RandomSource;
import net.minecraft.world.entity.Entity;
import net.minecraft.world.entity.EquipmentSlot;
import net.minecraft.world.entity.InsideBlockEffectApplier;
import net.minecraft.world.entity.InsideBlockEffectType;
import net.minecraft.world.entity.LivingEntity;
import net.minecraft.world.entity.item.FallingBlockEntity;
import net.minecraft.world.entity.player.Player;
import net.minecraft.world.item.ItemStack;
import net.minecraft.world.item.Items;
import net.minecraft.world.level.BlockGetter;
import net.minecraft.world.level.GameRules;
import net.minecraft.world.level.Level;
import net.minecraft.world.level.LevelAccessor;
import net.minecraft.world.level.block.state.BlockBehaviour;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.level.pathfinder.PathComputationType;
import net.minecraft.world.phys.Vec3;
import net.minecraft.world.phys.shapes.CollisionContext;
import net.minecraft.world.phys.shapes.EntityCollisionContext;
import net.minecraft.world.phys.shapes.Shapes;
import net.minecraft.world.phys.shapes.VoxelShape;
import org.jetbrains.annotations.Nullable;

public class PowderSnowBlock extends Block implements BucketPickup {
	public static final MapCodec<PowderSnowBlock> CODEC = simpleCodec(PowderSnowBlock::new);
	private static final float HORIZONTAL_PARTICLE_MOMENTUM_FACTOR = 0.083333336F;
	private static final float IN_BLOCK_HORIZONTAL_SPEED_MULTIPLIER = 0.9F;
	private static final float IN_BLOCK_VERTICAL_SPEED_MULTIPLIER = 1.5F;
	private static final float NUM_BLOCKS_TO_FALL_INTO_BLOCK = 2.5F;
	private static final VoxelShape FALLING_COLLISION_SHAPE = Shapes.box(0.0, 0.0, 0.0, 1.0, 0.9F, 1.0);
	private static final double MINIMUM_FALL_DISTANCE_FOR_SOUND = 4.0;
	private static final double MINIMUM_FALL_DISTANCE_FOR_BIG_SOUND = 7.0;

	@Override
	public MapCodec<PowderSnowBlock> codec() {
		return CODEC;
	}

	public PowderSnowBlock(BlockBehaviour.Properties properties) {
		super(properties);
	}

	@Override
	protected boolean skipRendering(BlockState state, BlockState adjacentState, Direction direction) {
		return adjacentState.is(this) ? true : super.skipRendering(state, adjacentState, direction);
	}

	@Override
	protected void entityInside(BlockState state, Level level, BlockPos pos, Entity entity, InsideBlockEffectApplier effectApplier) {
		if (!(entity instanceof LivingEntity) || entity.getInBlockState().is(this)) {
			entity.makeStuckInBlock(state, new Vec3(0.9F, 1.5, 0.9F));
			if (level.isClientSide) {
				RandomSource randomSource = level.getRandom();
				boolean bl = entity.xOld != entity.getX() || entity.zOld != entity.getZ();
				if (bl && randomSource.nextBoolean()) {
					level.addParticle(
						ParticleTypes.SNOWFLAKE,
						entity.getX(),
						pos.getY() + 1,
						entity.getZ(),
						Mth.randomBetween(randomSource, -1.0F, 1.0F) * 0.083333336F,
						0.05F,
						Mth.randomBetween(randomSource, -1.0F, 1.0F) * 0.083333336F
					);
				}
			}
		}

		BlockPos blockPos = pos.immutable();
		effectApplier.runBefore(
			InsideBlockEffectType.EXTINGUISH,
			entityx -> {
				if (level instanceof ServerLevel serverLevel
					&& entityx.isOnFire()
					&& (serverLevel.getGameRules().getBoolean(GameRules.RULE_MOBGRIEFING) || entityx instanceof Player)
					&& entityx.mayInteract(serverLevel, blockPos)) {
					level.destroyBlock(blockPos, false);
				}
			}
		);
		effectApplier.apply(InsideBlockEffectType.FREEZE);
		effectApplier.apply(InsideBlockEffectType.EXTINGUISH);
	}

	@Override
	public void fallOn(Level level, BlockState state, BlockPos pos, Entity entity, double fallDistance) {
		if (!(fallDistance < 4.0) && entity instanceof LivingEntity livingEntity) {
			LivingEntity.Fallsounds fallsounds = livingEntity.getFallSounds();
			SoundEvent soundEvent = fallDistance < 7.0 ? fallsounds.small() : fallsounds.big();
			entity.playSound(soundEvent, 1.0F, 1.0F);
		}
	}

	@Override
	protected VoxelShape getEntityInsideCollisionShape(BlockState state, BlockGetter level, BlockPos pos, Entity entity) {
		VoxelShape voxelShape = this.getCollisionShape(state, level, pos, CollisionContext.of(entity));
		return voxelShape.isEmpty() ? Shapes.block() : voxelShape;
	}

	@Override
	protected VoxelShape getCollisionShape(BlockState state, BlockGetter level, BlockPos pos, CollisionContext context) {
		if (!context.isPlacement() && context instanceof EntityCollisionContext entityCollisionContext) {
			Entity entity = entityCollisionContext.getEntity();
			if (entity != null) {
				if (entity.fallDistance > 2.5) {
					return FALLING_COLLISION_SHAPE;
				}

				boolean bl = entity instanceof FallingBlockEntity;
				if (bl || canEntityWalkOnPowderSnow(entity) && context.isAbove(Shapes.block(), pos, false) && !context.isDescending()) {
					return super.getCollisionShape(state, level, pos, context);
				}
			}
		}

		return Shapes.empty();
	}

	@Override
	protected VoxelShape getVisualShape(BlockState state, BlockGetter level, BlockPos pos, CollisionContext context) {
		return Shapes.empty();
	}

	public static boolean canEntityWalkOnPowderSnow(Entity entity) {
		if (entity.getType().is(EntityTypeTags.POWDER_SNOW_WALKABLE_MOBS)) {
			return true;
		} else {
			return entity instanceof LivingEntity ? ((LivingEntity)entity).getItemBySlot(EquipmentSlot.FEET).is(Items.LEATHER_BOOTS) : false;
		}
	}

	@Override
	public ItemStack pickupBlock(@Nullable LivingEntity owner, LevelAccessor level, BlockPos pos, BlockState state) {
		level.setBlock(pos, Blocks.AIR.defaultBlockState(), 11);
		if (!level.isClientSide()) {
			level.levelEvent(2001, pos, Block.getId(state));
		}

		return new ItemStack(Items.POWDER_SNOW_BUCKET);
	}

	@Override
	public Optional<SoundEvent> getPickupSound() {
		return Optional.of(SoundEvents.BUCKET_FILL_POWDER_SNOW);
	}

	@Override
	protected boolean isPathfindable(BlockState state, PathComputationType pathComputationType) {
		return true;
	}
}