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

package net.minecraft.world.level.block;

import com.mojang.serialization.MapCodec;
import com.mojang.serialization.codecs.RecordCodecBuilder;
import java.util.Map;
import net.minecraft.core.BlockPos;
import net.minecraft.core.Direction;
import net.minecraft.tags.BlockTags;
import net.minecraft.util.RandomSource;
import net.minecraft.world.InteractionHand;
import net.minecraft.world.InteractionResult;
import net.minecraft.world.entity.player.Player;
import net.minecraft.world.item.HangingSignItem;
import net.minecraft.world.item.ItemStack;
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.entity.BlockEntity;
import net.minecraft.world.level.block.entity.BlockEntityTicker;
import net.minecraft.world.level.block.entity.BlockEntityType;
import net.minecraft.world.level.block.entity.HangingSignBlockEntity;
import net.minecraft.world.level.block.entity.SignBlockEntity;
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.EnumProperty;
import net.minecraft.world.level.block.state.properties.WoodType;
import net.minecraft.world.level.material.FluidState;
import net.minecraft.world.level.material.Fluids;
import net.minecraft.world.level.pathfinder.PathComputationType;
import net.minecraft.world.phys.BlockHitResult;
import net.minecraft.world.phys.shapes.CollisionContext;
import net.minecraft.world.phys.shapes.Shapes;
import net.minecraft.world.phys.shapes.VoxelShape;
import org.jetbrains.annotations.Nullable;

public class WallHangingSignBlock extends SignBlock {
	public static final MapCodec<WallHangingSignBlock> CODEC = RecordCodecBuilder.mapCodec(
		instance -> instance.group(WoodType.CODEC.fieldOf("wood_type").forGetter(SignBlock::type), propertiesCodec()).apply(instance, WallHangingSignBlock::new)
	);
	public static final EnumProperty<Direction> FACING = HorizontalDirectionalBlock.FACING;
	private static final Map<Direction.Axis, VoxelShape> SHAPES_PLANK = Shapes.rotateHorizontalAxis(Block.column(16.0, 4.0, 14.0, 16.0));
	private static final Map<Direction.Axis, VoxelShape> SHAPES = Shapes.rotateHorizontalAxis(
		Shapes.or((VoxelShape)SHAPES_PLANK.get(Direction.Axis.Z), Block.column(14.0, 2.0, 0.0, 10.0))
	);

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

	public WallHangingSignBlock(WoodType type, BlockBehaviour.Properties properties) {
		super(type, properties.sound(type.hangingSignSoundType()));
		this.registerDefaultState(this.stateDefinition.any().setValue(FACING, Direction.NORTH).setValue(WATERLOGGED, false));
	}

	@Override
	protected InteractionResult useItemOn(
		ItemStack stack, BlockState state, Level level, BlockPos pos, Player player, InteractionHand hand, BlockHitResult hitResult
	) {
		return (InteractionResult)(level.getBlockEntity(pos) instanceof SignBlockEntity signBlockEntity
				&& this.shouldTryToChainAnotherHangingSign(state, player, hitResult, signBlockEntity, stack)
			? InteractionResult.PASS
			: super.useItemOn(stack, state, level, pos, player, hand, hitResult));
	}

	private boolean shouldTryToChainAnotherHangingSign(BlockState state, Player player, BlockHitResult hitResult, SignBlockEntity sign, ItemStack stack) {
		return !sign.canExecuteClickCommands(sign.isFacingFrontText(player), player)
			&& stack.getItem() instanceof HangingSignItem
			&& !this.isHittingEditableSide(hitResult, state);
	}

	private boolean isHittingEditableSide(BlockHitResult hitResult, BlockState state) {
		return hitResult.getDirection().getAxis() == ((Direction)state.getValue(FACING)).getAxis();
	}

	@Override
	protected VoxelShape getShape(BlockState state, BlockGetter level, BlockPos pos, CollisionContext context) {
		return (VoxelShape)SHAPES.get(((Direction)state.getValue(FACING)).getAxis());
	}

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

	@Override
	protected VoxelShape getCollisionShape(BlockState state, BlockGetter level, BlockPos pos, CollisionContext context) {
		return (VoxelShape)SHAPES_PLANK.get(((Direction)state.getValue(FACING)).getAxis());
	}

	public boolean canPlace(BlockState state, LevelReader level, BlockPos pos) {
		Direction direction = ((Direction)state.getValue(FACING)).getClockWise();
		Direction direction2 = ((Direction)state.getValue(FACING)).getCounterClockWise();
		return this.canAttachTo(level, state, pos.relative(direction), direction2) || this.canAttachTo(level, state, pos.relative(direction2), direction);
	}

	public boolean canAttachTo(LevelReader level, BlockState state, BlockPos pos, Direction direction) {
		BlockState blockState = level.getBlockState(pos);
		return blockState.is(BlockTags.WALL_HANGING_SIGNS)
			? ((Direction)blockState.getValue(FACING)).getAxis().test(state.getValue(FACING))
			: blockState.isFaceSturdy(level, pos, direction, SupportType.FULL);
	}

	@Nullable
	@Override
	public BlockState getStateForPlacement(BlockPlaceContext context) {
		BlockState blockState = this.defaultBlockState();
		FluidState fluidState = context.getLevel().getFluidState(context.getClickedPos());
		LevelReader levelReader = context.getLevel();
		BlockPos blockPos = context.getClickedPos();

		for (Direction direction : context.getNearestLookingDirections()) {
			if (direction.getAxis().isHorizontal() && !direction.getAxis().test(context.getClickedFace())) {
				Direction direction2 = direction.getOpposite();
				blockState = blockState.setValue(FACING, direction2);
				if (blockState.canSurvive(levelReader, blockPos) && this.canPlace(blockState, levelReader, blockPos)) {
					return blockState.setValue(WATERLOGGED, fluidState.getType() == Fluids.WATER);
				}
			}
		}

		return null;
	}

	@Override
	protected BlockState updateShape(
		BlockState state,
		LevelReader level,
		ScheduledTickAccess scheduledTickAccess,
		BlockPos pos,
		Direction direction,
		BlockPos neighborPos,
		BlockState neighborState,
		RandomSource random
	) {
		return direction.getAxis() == ((Direction)state.getValue(FACING)).getClockWise().getAxis() && !state.canSurvive(level, pos)
			? Blocks.AIR.defaultBlockState()
			: super.updateShape(state, level, scheduledTickAccess, pos, direction, neighborPos, neighborState, random);
	}

	@Override
	public float getYRotationDegrees(BlockState state) {
		return ((Direction)state.getValue(FACING)).toYRot();
	}

	@Override
	protected BlockState rotate(BlockState state, Rotation rotation) {
		return state.setValue(FACING, rotation.rotate(state.getValue(FACING)));
	}

	@Override
	protected BlockState mirror(BlockState state, Mirror mirror) {
		return state.rotate(mirror.getRotation(state.getValue(FACING)));
	}

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

	@Override
	public BlockEntity newBlockEntity(BlockPos pos, BlockState state) {
		return new HangingSignBlockEntity(pos, state);
	}

	@Override
	protected boolean isPathfindable(BlockState state, PathComputationType pathComputationType) {
		return false;
	}

	@Nullable
	@Override
	public <T extends BlockEntity> BlockEntityTicker<T> getTicker(Level level, BlockState state, BlockEntityType<T> blockEntityType) {
		return createTickerHelper(blockEntityType, BlockEntityType.HANGING_SIGN, SignBlockEntity::tick);
	}
}