public class VerticalSlabBlock extends HorizontalFacingBlock {
	// codec 从 1.20.5 开始是必需的，但是还没有在 Minecraft 中实际使用。
	public static final MapCodec<VerticalSlabBlock> CODEC = Block.createCodec(VerticalSlabBlock::new);

	public VerticalSlabBlock(Settings settings) {
		super(settings);
		setDefaultState(getDefaultState().with(Properties.HORIZONTAL_FACING, Direction.NORTH));
	}

	@Override
	protected MapCodec<? extends VerticalSlabBlock> getCodec() {
		return CODEC;
	}

	@Override
	protected void appendProperties(StateManager.Builder<Block, BlockState> builder) {
		builder.add(Properties.HORIZONTAL_FACING);
	}

	@Override
	public VoxelShape getOutlineShape(BlockState state, BlockView world, BlockPos pos, ShapeContext ctx) {
		Direction dir = state.get(FACING);
		return switch (dir) {
			case NORTH -> VoxelShapes.cuboid(0.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.5f);
			case SOUTH -> VoxelShapes.cuboid(0.0f, 0.0f, 0.5f, 1.0f, 1.0f, 1.0f);
			case EAST -> VoxelShapes.cuboid(0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f);
			case WEST -> VoxelShapes.cuboid(0.0f, 0.0f, 0.0f, 0.5f, 1.0f, 1.0f);
			default -> VoxelShapes.fullCube();
		};
	}

        @Override
	public BlockState getPlacementState(ItemPlacementContext ctx) {
		return super.getPlacementState(ctx).with(Properties.HORIZONTAL_FACING, ctx.getHorizontalPlayerFacing().getOpposite());
	}

}