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

package net.minecraft.world.level.block;

import com.mojang.serialization.MapCodec;
import java.util.OptionalInt;
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.tags.BlockTags;
import net.minecraft.util.ParticleUtils;
import net.minecraft.util.RandomSource;
import net.minecraft.world.item.context.BlockPlaceContext;
import net.minecraft.world.level.BlockGetter;
import net.minecraft.world.level.Level;
import net.minecraft.world.level.LevelAccessor;
import net.minecraft.world.level.LevelReader;
import net.minecraft.world.level.ScheduledTickAccess;
import net.minecraft.world.level.block.state.BlockBehaviour;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.level.block.state.StateDefinition.Builder;
import net.minecraft.world.level.block.state.properties.BlockStateProperties;
import net.minecraft.world.level.block.state.properties.BooleanProperty;
import net.minecraft.world.level.block.state.properties.IntegerProperty;
import net.minecraft.world.level.material.FluidState;
import net.minecraft.world.level.material.Fluids;
import net.minecraft.world.phys.shapes.Shapes;
import net.minecraft.world.phys.shapes.VoxelShape;

public abstract class LeavesBlock extends Block implements SimpleWaterloggedBlock {
	public static final int DECAY_DISTANCE = 7;
	public static final IntegerProperty DISTANCE = BlockStateProperties.DISTANCE;
	public static final BooleanProperty PERSISTENT = BlockStateProperties.PERSISTENT;
	public static final BooleanProperty WATERLOGGED = BlockStateProperties.WATERLOGGED;
	protected final float leafParticleChance;
	private static final int TICK_DELAY = 1;

	@Override
	public abstract MapCodec<? extends LeavesBlock> codec();

	public LeavesBlock(float leafParticleChance, BlockBehaviour.Properties properties) {
		super(properties);
		this.leafParticleChance = leafParticleChance;
		this.registerDefaultState(this.stateDefinition.any().setValue(DISTANCE, 7).setValue(PERSISTENT, false).setValue(WATERLOGGED, false));
	}

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

	@Override
	protected boolean isRandomlyTicking(BlockState state) {
		return (Integer)state.getValue(DISTANCE) == 7 && !(Boolean)state.getValue(PERSISTENT);
	}

	@Override
	protected void randomTick(BlockState state, ServerLevel level, BlockPos pos, RandomSource random) {
		if (this.decaying(state)) {
			dropResources(state, level, pos);
			level.removeBlock(pos, false);
		}
	}

	protected boolean decaying(BlockState state) {
		return !(Boolean)state.getValue(PERSISTENT) && (Integer)state.getValue(DISTANCE) == 7;
	}

	@Override
	protected void tick(BlockState state, ServerLevel level, BlockPos pos, RandomSource random) {
		level.setBlock(pos, updateDistance(state, level, pos), 3);
	}

	@Override
	protected int getLightBlock(BlockState state) {
		return 1;
	}

	@Override
	protected BlockState updateShape(
		BlockState state,
		LevelReader level,
		ScheduledTickAccess scheduledTickAccess,
		BlockPos pos,
		Direction direction,
		BlockPos neighborPos,
		BlockState neighborState,
		RandomSource random
	) {
		if ((Boolean)state.getValue(WATERLOGGED)) {
			scheduledTickAccess.scheduleTick(pos, Fluids.WATER, Fluids.WATER.getTickDelay(level));
		}

		int i = getDistanceAt(neighborState) + 1;
		if (i != 1 || (Integer)state.getValue(DISTANCE) != i) {
			scheduledTickAccess.scheduleTick(pos, this, 1);
		}

		return state;
	}

	private static BlockState updateDistance(BlockState state, LevelAccessor level, BlockPos pos) {
		int i = 7;
		BlockPos.MutableBlockPos mutableBlockPos = new BlockPos.MutableBlockPos();

		for (Direction direction : Direction.values()) {
			mutableBlockPos.setWithOffset(pos, direction);
			i = Math.min(i, getDistanceAt(level.getBlockState(mutableBlockPos)) + 1);
			if (i == 1) {
				break;
			}
		}

		return state.setValue(DISTANCE, i);
	}

	private static int getDistanceAt(BlockState neighbor) {
		return getOptionalDistanceAt(neighbor).orElse(7);
	}

	public static OptionalInt getOptionalDistanceAt(BlockState state) {
		if (state.is(BlockTags.LOGS)) {
			return OptionalInt.of(0);
		} else {
			return state.hasProperty(DISTANCE) ? OptionalInt.of((Integer)state.getValue(DISTANCE)) : OptionalInt.empty();
		}
	}

	@Override
	protected FluidState getFluidState(BlockState state) {
		return state.getValue(WATERLOGGED) ? Fluids.WATER.getSource(false) : super.getFluidState(state);
	}

	@Override
	public void animateTick(BlockState state, Level level, BlockPos pos, RandomSource random) {
		super.animateTick(state, level, pos, random);
		BlockPos blockPos = pos.below();
		BlockState blockState = level.getBlockState(blockPos);
		makeDrippingWaterParticles(level, pos, random, blockState, blockPos);
		this.makeFallingLeavesParticles(level, pos, random, blockState, blockPos);
	}

	private static void makeDrippingWaterParticles(Level level, BlockPos pos, RandomSource random, BlockState blockBelow, BlockPos belowPos) {
		if (level.isRainingAt(pos.above())) {
			if (random.nextInt(15) == 1) {
				if (!blockBelow.canOcclude() || !blockBelow.isFaceSturdy(level, belowPos, Direction.UP)) {
					ParticleUtils.spawnParticleBelow(level, pos, random, ParticleTypes.DRIPPING_WATER);
				}
			}
		}
	}

	private void makeFallingLeavesParticles(Level level, BlockPos pos, RandomSource random, BlockState blockBelow, BlockPos belowPos) {
		if (!(random.nextFloat() >= this.leafParticleChance)) {
			if (!isFaceFull(blockBelow.getCollisionShape(level, belowPos), Direction.UP)) {
				this.spawnFallingLeavesParticle(level, pos, random);
			}
		}
	}

	protected abstract void spawnFallingLeavesParticle(Level level, BlockPos pos, RandomSource random);

	@Override
	protected void createBlockStateDefinition(Builder<Block, BlockState> builder) {
		builder.add(DISTANCE, PERSISTENT, WATERLOGGED);
	}

	@Override
	public BlockState getStateForPlacement(BlockPlaceContext context) {
		FluidState fluidState = context.getLevel().getFluidState(context.getClickedPos());
		BlockState blockState = this.defaultBlockState().setValue(PERSISTENT, true).setValue(WATERLOGGED, fluidState.getType() == Fluids.WATER);
		return updateDistance(blockState, context.getLevel(), context.getClickedPos());
	}
}