minecraft-src/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.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.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),
		(VoxelShape)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,
		(VoxelShape)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 properties) {
		super(properties);
		this.registerDefaultState(this.stateDefinition.any().setValue(DISTANCE, 7).setValue(WATERLOGGED, false).setValue(BOTTOM, false));
	}

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

	@Override
	protected VoxelShape getShape(BlockState state, BlockGetter level, BlockPos pos, CollisionContext context) {
		if (!context.isHoldingItem(state.getBlock().asItem())) {
			return state.getValue(BOTTOM) ? SHAPE_UNSTABLE : SHAPE_STABLE;
		} else {
			return Shapes.block();
		}
	}

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

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

	@Override
	public BlockState getStateForPlacement(BlockPlaceContext context) {
		BlockPos blockPos = context.getClickedPos();
		Level level = context.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 state, Level level, BlockPos pos, BlockState oldState, boolean movedByPiston) {
		if (!level.isClientSide) {
			level.scheduleTick(pos, this, 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));
		}

		if (!level.isClientSide()) {
			scheduledTickAccess.scheduleTick(pos, this, 1);
		}

		return state;
	}

	@Override
	protected void tick(BlockState state, ServerLevel level, BlockPos pos, RandomSource random) {
		int i = getDistance(level, pos);
		BlockState blockState = state.setValue(DISTANCE, i).setValue(BOTTOM, this.isBottom(level, pos, i));
		if ((Integer)blockState.getValue(DISTANCE) == 7) {
			if ((Integer)state.getValue(DISTANCE) == 7) {
				FallingBlockEntity.fall(level, pos, blockState);
			} else {
				level.destroyBlock(pos, true);
			}
		} else if (state != blockState) {
			level.setBlock(pos, blockState, 3);
		}
	}

	@Override
	protected boolean canSurvive(BlockState state, LevelReader level, BlockPos pos) {
		return getDistance(level, pos) < 7;
	}

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

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

	private boolean isBottom(BlockGetter level, BlockPos pos, int distance) {
		return distance > 0 && !level.getBlockState(pos.below()).is(this);
	}

	public static int getDistance(BlockGetter level, BlockPos pos) {
		BlockPos.MutableBlockPos mutableBlockPos = pos.mutable().move(Direction.DOWN);
		BlockState blockState = level.getBlockState(mutableBlockPos);
		int i = 7;
		if (blockState.is(Blocks.SCAFFOLDING)) {
			i = (Integer)blockState.getValue(DISTANCE);
		} else if (blockState.isFaceSturdy(level, mutableBlockPos, Direction.UP)) {
			return 0;
		}

		for (Direction direction : Direction.Plane.HORIZONTAL) {
			BlockState blockState2 = level.getBlockState(mutableBlockPos.setWithOffset(pos, direction));
			if (blockState2.is(Blocks.SCAFFOLDING)) {
				i = Math.min(i, (Integer)blockState2.getValue(DISTANCE) + 1);
				if (i == 1) {
					break;
				}
			}
		}

		return i;
	}
}