Code/net/minecraft/world/level/block/HangingMossBlock.java

package net.minecraft.world.level.block;

import com.mojang.serialization.MapCodec;
import net.minecraft.core.BlockPos;
import net.minecraft.core.Direction;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.sounds.SoundEvents;
import net.minecraft.sounds.SoundSource;
import net.minecraft.tags.BlockTags;
import net.minecraft.util.RandomSource;
import net.minecraft.world.level.BlockGetter;
import net.minecraft.world.level.Level;
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;
import net.minecraft.world.level.block.state.properties.BlockStateProperties;
import net.minecraft.world.level.block.state.properties.BooleanProperty;
import net.minecraft.world.phys.shapes.CollisionContext;
import net.minecraft.world.phys.shapes.VoxelShape;

public class HangingMossBlock extends Block implements BonemealableBlock {
    public static final MapCodec<HangingMossBlock> CODEC = simpleCodec(HangingMossBlock::new);
    private static final VoxelShape SHAPE_BASE = Block.column(14.0, 0.0, 16.0);
    private static final VoxelShape SHAPE_TIP = Block.column(14.0, 2.0, 16.0);
    public static final BooleanProperty TIP = BlockStateProperties.TIP;

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

    public HangingMossBlock(BlockBehaviour.Properties p_369795_) {
        super(p_369795_);
        this.registerDefaultState(this.stateDefinition.any().setValue(TIP, true));
    }

    @Override
    protected VoxelShape getShape(BlockState p_365701_, BlockGetter p_361960_, BlockPos p_364640_, CollisionContext p_365299_) {
        return p_365701_.getValue(TIP) ? SHAPE_TIP : SHAPE_BASE;
    }

    @Override
    public void animateTick(BlockState p_362034_, Level p_368572_, BlockPos p_366897_, RandomSource p_361415_) {
        if (p_361415_.nextInt(500) == 0) {
            BlockState blockstate = p_368572_.getBlockState(p_366897_.above());
            if (blockstate.is(BlockTags.PALE_OAK_LOGS) || blockstate.is(Blocks.PALE_OAK_LEAVES)) {
                p_368572_.playLocalSound(
                    p_366897_.getX(), p_366897_.getY(), p_366897_.getZ(), SoundEvents.PALE_HANGING_MOSS_IDLE, SoundSource.AMBIENT, 1.0F, 1.0F, false
                );
            }
        }
    }

    @Override
    protected boolean propagatesSkylightDown(BlockState p_370166_) {
        return true;
    }

    @Override
    protected boolean canSurvive(BlockState p_361782_, LevelReader p_367417_, BlockPos p_366634_) {
        return this.canStayAtPosition(p_367417_, p_366634_);
    }

    private boolean canStayAtPosition(BlockGetter p_365484_, BlockPos p_362413_) {
        BlockPos blockpos = p_362413_.relative(Direction.UP);
        BlockState blockstate = p_365484_.getBlockState(blockpos);
        return MultifaceBlock.canAttachTo(p_365484_, Direction.UP, blockpos, blockstate) || blockstate.is(Blocks.PALE_HANGING_MOSS);
    }

    @Override
    protected BlockState updateShape(
        BlockState p_361250_,
        LevelReader p_370189_,
        ScheduledTickAccess p_362194_,
        BlockPos p_366744_,
        Direction p_367183_,
        BlockPos p_366942_,
        BlockState p_369003_,
        RandomSource p_363174_
    ) {
        if (!this.canStayAtPosition(p_370189_, p_366744_)) {
            p_362194_.scheduleTick(p_366744_, this, 1);
        }

        return p_361250_.setValue(TIP, !p_370189_.getBlockState(p_366744_.below()).is(this));
    }

    @Override
    protected void tick(BlockState p_367034_, ServerLevel p_368909_, BlockPos p_361251_, RandomSource p_363153_) {
        if (!this.canStayAtPosition(p_368909_, p_361251_)) {
            p_368909_.destroyBlock(p_361251_, true);
        }
    }

    @Override
    protected void createBlockStateDefinition(StateDefinition.Builder<Block, BlockState> p_361400_) {
        p_361400_.add(TIP);
    }

    @Override
    public boolean isValidBonemealTarget(LevelReader p_362841_, BlockPos p_362408_, BlockState p_365198_) {
        return this.canGrowInto(p_362841_.getBlockState(this.getTip(p_362841_, p_362408_).below()));
    }

    private boolean canGrowInto(BlockState p_369343_) {
        return p_369343_.isAir();
    }

    public BlockPos getTip(BlockGetter p_363698_, BlockPos p_367170_) {
        BlockPos.MutableBlockPos blockpos$mutableblockpos = p_367170_.mutable();

        BlockState blockstate;
        do {
            blockpos$mutableblockpos.move(Direction.DOWN);
            blockstate = p_363698_.getBlockState(blockpos$mutableblockpos);
        } while (blockstate.is(this));

        return blockpos$mutableblockpos.relative(Direction.UP).immutable();
    }

    @Override
    public boolean isBonemealSuccess(Level p_369749_, RandomSource p_362047_, BlockPos p_361385_, BlockState p_361113_) {
        return true;
    }

    @Override
    public void performBonemeal(ServerLevel p_362461_, RandomSource p_362879_, BlockPos p_361813_, BlockState p_362206_) {
        BlockPos blockpos = this.getTip(p_362461_, p_361813_).below();
        if (this.canGrowInto(p_362461_.getBlockState(blockpos))) {
            p_362461_.setBlockAndUpdate(blockpos, p_362206_.setValue(TIP, true));
        }
    }
}