Code/net/minecraft/world/level/block/ScaffoldingBlock.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.util.RandomSource;
import net.minecraft.world.entity.item.FallingBlockEntity;
import net.minecraft.world.item.context.BlockPlaceContext;
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.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.CollisionContext;
import net.minecraft.world.phys.shapes.Shapes;
import net.minecraft.world.phys.shapes.VoxelShape;

public class ScaffoldingBlock extends Block implements SimpleWaterloggedBlock {
    public static final MapCodec<ScaffoldingBlock> CODEC = simpleCodec(ScaffoldingBlock::new);
    private static final int TICK_DELAY = 1;
    private static final VoxelShape SHAPE_STABLE = Shapes.or(
        Block.column(16.0, 14.0, 16.0),
        Shapes.rotateHorizontal(Block.box(0.0, 0.0, 0.0, 2.0, 16.0, 2.0)).values().stream().reduce(Shapes.empty(), Shapes::or)
    );
    private static final VoxelShape SHAPE_UNSTABLE_BOTTOM = Block.column(16.0, 0.0, 2.0);
    private static final VoxelShape SHAPE_UNSTABLE = Shapes.or(
        SHAPE_STABLE, SHAPE_UNSTABLE_BOTTOM, Shapes.rotateHorizontal(Block.boxZ(16.0, 0.0, 2.0, 0.0, 2.0)).values().stream().reduce(Shapes.empty(), Shapes::or)
    );
    private static final VoxelShape SHAPE_BELOW_BLOCK = Shapes.block().move(0.0, -1.0, 0.0).optimize();
    public static final int STABILITY_MAX_DISTANCE = 7;
    public static final IntegerProperty DISTANCE = BlockStateProperties.STABILITY_DISTANCE;
    public static final BooleanProperty WATERLOGGED = BlockStateProperties.WATERLOGGED;
    public static final BooleanProperty BOTTOM = BlockStateProperties.BOTTOM;

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

    protected ScaffoldingBlock(BlockBehaviour.Properties p_56021_) {
        super(p_56021_);
        this.registerDefaultState(this.stateDefinition.any().setValue(DISTANCE, 7).setValue(WATERLOGGED, false).setValue(BOTTOM, false));
    }

    @Override
    protected void createBlockStateDefinition(StateDefinition.Builder<Block, BlockState> p_56051_) {
        p_56051_.add(DISTANCE, WATERLOGGED, BOTTOM);
    }

    @Override
    protected VoxelShape getShape(BlockState p_56057_, BlockGetter p_56058_, BlockPos p_56059_, CollisionContext p_56060_) {
        if (!p_56060_.isHoldingItem(p_56057_.getBlock().asItem())) {
            return p_56057_.getValue(BOTTOM) ? SHAPE_UNSTABLE : SHAPE_STABLE;
        } else {
            return Shapes.block();
        }
    }

    @Override
    protected VoxelShape getInteractionShape(BlockState p_56053_, BlockGetter p_56054_, BlockPos p_56055_) {
        return Shapes.block();
    }

    @Override
    protected boolean canBeReplaced(BlockState p_56037_, BlockPlaceContext p_56038_) {
        return p_56038_.getItemInHand().is(this.asItem());
    }

    @Override
    public BlockState getStateForPlacement(BlockPlaceContext p_56023_) {
        BlockPos blockpos = p_56023_.getClickedPos();
        Level level = p_56023_.getLevel();
        int i = getDistance(level, blockpos);
        return this.defaultBlockState()
            .setValue(WATERLOGGED, level.getFluidState(blockpos).getType() == Fluids.WATER)
            .setValue(DISTANCE, i)
            .setValue(BOTTOM, this.isBottom(level, blockpos, i));
    }

    @Override
    protected void onPlace(BlockState p_56062_, Level p_56063_, BlockPos p_56064_, BlockState p_56065_, boolean p_56066_) {
        if (!p_56063_.isClientSide) {
            p_56063_.scheduleTick(p_56064_, this, 1);
        }
    }

    @Override
    protected BlockState updateShape(
        BlockState p_56044_,
        LevelReader p_365588_,
        ScheduledTickAccess p_361394_,
        BlockPos p_56048_,
        Direction p_56045_,
        BlockPos p_56049_,
        BlockState p_56046_,
        RandomSource p_369734_
    ) {
        if (p_56044_.getValue(WATERLOGGED)) {
            p_361394_.scheduleTick(p_56048_, Fluids.WATER, Fluids.WATER.getTickDelay(p_365588_));
        }

        if (!p_365588_.isClientSide()) {
            p_361394_.scheduleTick(p_56048_, this, 1);
        }

        return p_56044_;
    }

    @Override
    protected void tick(BlockState p_222019_, ServerLevel p_222020_, BlockPos p_222021_, RandomSource p_222022_) {
        int i = getDistance(p_222020_, p_222021_);
        BlockState blockstate = p_222019_.setValue(DISTANCE, i).setValue(BOTTOM, this.isBottom(p_222020_, p_222021_, i));
        if (blockstate.getValue(DISTANCE) == 7) {
            if (p_222019_.getValue(DISTANCE) == 7) {
                FallingBlockEntity.fall(p_222020_, p_222021_, blockstate);
            } else {
                p_222020_.destroyBlock(p_222021_, true);
            }
        } else if (p_222019_ != blockstate) {
            p_222020_.setBlock(p_222021_, blockstate, 3);
        }
    }

    @Override
    protected boolean canSurvive(BlockState p_56040_, LevelReader p_56041_, BlockPos p_56042_) {
        return getDistance(p_56041_, p_56042_) < 7;
    }

    @Override
    protected VoxelShape getCollisionShape(BlockState p_56068_, BlockGetter p_56069_, BlockPos p_56070_, CollisionContext p_56071_) {
        if (p_56071_.isPlacement()) {
            return Shapes.empty();
        } else if (p_56071_.isAbove(Shapes.block(), p_56070_, true) && !p_56071_.isDescending()) {
            return SHAPE_STABLE;
        } else {
            return p_56068_.getValue(DISTANCE) != 0 && p_56068_.getValue(BOTTOM) && p_56071_.isAbove(SHAPE_BELOW_BLOCK, p_56070_, true)
                ? SHAPE_UNSTABLE_BOTTOM
                : Shapes.empty();
        }
    }

    @Override
    protected FluidState getFluidState(BlockState p_56073_) {
        return p_56073_.getValue(WATERLOGGED) ? Fluids.WATER.getSource(false) : super.getFluidState(p_56073_);
    }

    private boolean isBottom(BlockGetter p_56028_, BlockPos p_56029_, int p_56030_) {
        return p_56030_ > 0 && !p_56028_.getBlockState(p_56029_.below()).is(this);
    }

    public static int getDistance(BlockGetter p_56025_, BlockPos p_56026_) {
        BlockPos.MutableBlockPos blockpos$mutableblockpos = p_56026_.mutable().move(Direction.DOWN);
        BlockState blockstate = p_56025_.getBlockState(blockpos$mutableblockpos);
        int i = 7;
        if (blockstate.is(Blocks.SCAFFOLDING)) {
            i = blockstate.getValue(DISTANCE);
        } else if (blockstate.isFaceSturdy(p_56025_, blockpos$mutableblockpos, Direction.UP)) {
            return 0;
        }

        for (Direction direction : Direction.Plane.HORIZONTAL) {
            BlockState blockstate1 = p_56025_.getBlockState(blockpos$mutableblockpos.setWithOffset(p_56026_, direction));
            if (blockstate1.is(Blocks.SCAFFOLDING)) {
                i = Math.min(i, blockstate1.getValue(DISTANCE) + 1);
                if (i == 1) {
                    break;
                }
            }
        }

        return i;
    }
}