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

package net.minecraft.world.level.block;

import com.mojang.serialization.MapCodec;
import java.util.Map;
import javax.annotation.Nullable;
import net.minecraft.core.BlockPos;
import net.minecraft.core.Direction;
import net.minecraft.core.component.DataComponents;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.sounds.SoundEvents;
import net.minecraft.sounds.SoundSource;
import net.minecraft.stats.Stats;
import net.minecraft.tags.ItemTags;
import net.minecraft.util.RandomSource;
import net.minecraft.world.InteractionHand;
import net.minecraft.world.InteractionResult;
import net.minecraft.world.MenuProvider;
import net.minecraft.world.entity.Entity;
import net.minecraft.world.entity.LivingEntity;
import net.minecraft.world.entity.player.Player;
import net.minecraft.world.item.ItemStack;
import net.minecraft.world.item.component.CustomData;
import net.minecraft.world.item.context.BlockPlaceContext;
import net.minecraft.world.level.BlockGetter;
import net.minecraft.world.level.Level;
import net.minecraft.world.level.block.entity.BlockEntity;
import net.minecraft.world.level.block.entity.LecternBlockEntity;
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.EnumProperty;
import net.minecraft.world.level.gameevent.GameEvent;
import net.minecraft.world.level.pathfinder.PathComputationType;
import net.minecraft.world.level.redstone.ExperimentalRedstoneUtils;
import net.minecraft.world.level.redstone.Orientation;
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;

public class LecternBlock extends BaseEntityBlock {
    public static final MapCodec<LecternBlock> CODEC = simpleCodec(LecternBlock::new);
    public static final EnumProperty<Direction> FACING = HorizontalDirectionalBlock.FACING;
    public static final BooleanProperty POWERED = BlockStateProperties.POWERED;
    public static final BooleanProperty HAS_BOOK = BlockStateProperties.HAS_BOOK;
    private static final VoxelShape SHAPE_COLLISION = Shapes.or(Block.column(16.0, 0.0, 2.0), Block.column(8.0, 2.0, 14.0));
    private static final Map<Direction, VoxelShape> SHAPES = Shapes.rotateHorizontal(
        Shapes.or(
            Block.boxZ(16.0, 10.0, 14.0, 1.0, 5.333333),
            Block.boxZ(16.0, 12.0, 16.0, 5.333333, 9.666667),
            Block.boxZ(16.0, 14.0, 18.0, 9.666667, 14.0),
            SHAPE_COLLISION
        )
    );
    private static final int PAGE_CHANGE_IMPULSE_TICKS = 2;

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

    protected LecternBlock(BlockBehaviour.Properties p_54479_) {
        super(p_54479_);
        this.registerDefaultState(this.stateDefinition.any().setValue(FACING, Direction.NORTH).setValue(POWERED, false).setValue(HAS_BOOK, false));
    }

    @Override
    protected VoxelShape getOcclusionShape(BlockState p_54584_) {
        return SHAPE_COLLISION;
    }

    @Override
    protected boolean useShapeForLightOcclusion(BlockState p_54582_) {
        return true;
    }

    @Override
    public BlockState getStateForPlacement(BlockPlaceContext p_54481_) {
        Level level = p_54481_.getLevel();
        ItemStack itemstack = p_54481_.getItemInHand();
        Player player = p_54481_.getPlayer();
        boolean flag = false;
        if (!level.isClientSide && player != null && player.canUseGameMasterBlocks()) {
            CustomData customdata = itemstack.getOrDefault(DataComponents.BLOCK_ENTITY_DATA, CustomData.EMPTY);
            if (customdata.contains("Book")) {
                flag = true;
            }
        }

        return this.defaultBlockState().setValue(FACING, p_54481_.getHorizontalDirection().getOpposite()).setValue(HAS_BOOK, flag);
    }

    @Override
    protected VoxelShape getCollisionShape(BlockState p_54577_, BlockGetter p_54578_, BlockPos p_54579_, CollisionContext p_54580_) {
        return SHAPE_COLLISION;
    }

    @Override
    protected VoxelShape getShape(BlockState p_54561_, BlockGetter p_54562_, BlockPos p_54563_, CollisionContext p_54564_) {
        return SHAPES.get(p_54561_.getValue(FACING));
    }

    @Override
    protected BlockState rotate(BlockState p_54540_, Rotation p_54541_) {
        return p_54540_.setValue(FACING, p_54541_.rotate(p_54540_.getValue(FACING)));
    }

    @Override
    protected BlockState mirror(BlockState p_54537_, Mirror p_54538_) {
        return p_54537_.rotate(p_54538_.getRotation(p_54537_.getValue(FACING)));
    }

    @Override
    protected void createBlockStateDefinition(StateDefinition.Builder<Block, BlockState> p_54543_) {
        p_54543_.add(FACING, POWERED, HAS_BOOK);
    }

    @Override
    public BlockEntity newBlockEntity(BlockPos p_153573_, BlockState p_153574_) {
        return new LecternBlockEntity(p_153573_, p_153574_);
    }

    public static boolean tryPlaceBook(@Nullable LivingEntity p_344930_, Level p_270604_, BlockPos p_270276_, BlockState p_270445_, ItemStack p_270458_) {
        if (!p_270445_.getValue(HAS_BOOK)) {
            if (!p_270604_.isClientSide) {
                placeBook(p_344930_, p_270604_, p_270276_, p_270445_, p_270458_);
            }

            return true;
        } else {
            return false;
        }
    }

    private static void placeBook(@Nullable LivingEntity p_343476_, Level p_270065_, BlockPos p_270155_, BlockState p_270753_, ItemStack p_270173_) {
        if (p_270065_.getBlockEntity(p_270155_) instanceof LecternBlockEntity lecternblockentity) {
            lecternblockentity.setBook(p_270173_.consumeAndReturn(1, p_343476_));
            resetBookState(p_343476_, p_270065_, p_270155_, p_270753_, true);
            p_270065_.playSound(null, p_270155_, SoundEvents.BOOK_PUT, SoundSource.BLOCKS, 1.0F, 1.0F);
        }
    }

    public static void resetBookState(@Nullable Entity p_270231_, Level p_270114_, BlockPos p_270251_, BlockState p_270758_, boolean p_270452_) {
        BlockState blockstate = p_270758_.setValue(POWERED, false).setValue(HAS_BOOK, p_270452_);
        p_270114_.setBlock(p_270251_, blockstate, 3);
        p_270114_.gameEvent(GameEvent.BLOCK_CHANGE, p_270251_, GameEvent.Context.of(p_270231_, blockstate));
        updateBelow(p_270114_, p_270251_, p_270758_);
    }

    public static void signalPageChange(Level p_54489_, BlockPos p_54490_, BlockState p_54491_) {
        changePowered(p_54489_, p_54490_, p_54491_, true);
        p_54489_.scheduleTick(p_54490_, p_54491_.getBlock(), 2);
        p_54489_.levelEvent(1043, p_54490_, 0);
    }

    private static void changePowered(Level p_54554_, BlockPos p_54555_, BlockState p_54556_, boolean p_54557_) {
        p_54554_.setBlock(p_54555_, p_54556_.setValue(POWERED, p_54557_), 3);
        updateBelow(p_54554_, p_54555_, p_54556_);
    }

    private static void updateBelow(Level p_54545_, BlockPos p_54546_, BlockState p_54547_) {
        Orientation orientation = ExperimentalRedstoneUtils.initialOrientation(p_54545_, p_54547_.getValue(FACING).getOpposite(), Direction.UP);
        p_54545_.updateNeighborsAt(p_54546_.below(), p_54547_.getBlock(), orientation);
    }

    @Override
    protected void tick(BlockState p_221388_, ServerLevel p_221389_, BlockPos p_221390_, RandomSource p_221391_) {
        changePowered(p_221389_, p_221390_, p_221388_, false);
    }

    @Override
    protected void affectNeighborsAfterRemoval(BlockState p_393657_, ServerLevel p_393193_, BlockPos p_396375_, boolean p_391996_) {
        if (p_393657_.getValue(POWERED)) {
            updateBelow(p_393193_, p_396375_, p_393657_);
        }
    }

    @Override
    protected boolean isSignalSource(BlockState p_54575_) {
        return true;
    }

    @Override
    protected int getSignal(BlockState p_54515_, BlockGetter p_54516_, BlockPos p_54517_, Direction p_54518_) {
        return p_54515_.getValue(POWERED) ? 15 : 0;
    }

    @Override
    protected int getDirectSignal(BlockState p_54566_, BlockGetter p_54567_, BlockPos p_54568_, Direction p_54569_) {
        return p_54569_ == Direction.UP && p_54566_.getValue(POWERED) ? 15 : 0;
    }

    @Override
    protected boolean hasAnalogOutputSignal(BlockState p_54503_) {
        return true;
    }

    @Override
    protected int getAnalogOutputSignal(BlockState p_54520_, Level p_54521_, BlockPos p_54522_) {
        if (p_54520_.getValue(HAS_BOOK)) {
            BlockEntity blockentity = p_54521_.getBlockEntity(p_54522_);
            if (blockentity instanceof LecternBlockEntity) {
                return ((LecternBlockEntity)blockentity).getRedstoneSignal();
            }
        }

        return 0;
    }

    @Override
    protected InteractionResult useItemOn(
        ItemStack p_333093_, BlockState p_335984_, Level p_334086_, BlockPos p_332284_, Player p_332545_, InteractionHand p_328802_, BlockHitResult p_328840_
    ) {
        if (p_335984_.getValue(HAS_BOOK)) {
            return InteractionResult.TRY_WITH_EMPTY_HAND;
        } else if (p_333093_.is(ItemTags.LECTERN_BOOKS)) {
            return (InteractionResult)(tryPlaceBook(p_332545_, p_334086_, p_332284_, p_335984_, p_333093_)
                ? InteractionResult.SUCCESS
                : InteractionResult.PASS);
        } else {
            return (InteractionResult)(p_333093_.isEmpty() && p_328802_ == InteractionHand.MAIN_HAND
                ? InteractionResult.PASS
                : InteractionResult.TRY_WITH_EMPTY_HAND);
        }
    }

    @Override
    protected InteractionResult useWithoutItem(BlockState p_331321_, Level p_329665_, BlockPos p_335448_, Player p_333152_, BlockHitResult p_331406_) {
        if (p_331321_.getValue(HAS_BOOK)) {
            if (!p_329665_.isClientSide) {
                this.openScreen(p_329665_, p_335448_, p_333152_);
            }

            return InteractionResult.SUCCESS;
        } else {
            return InteractionResult.CONSUME;
        }
    }

    @Nullable
    @Override
    protected MenuProvider getMenuProvider(BlockState p_54571_, Level p_54572_, BlockPos p_54573_) {
        return !p_54571_.getValue(HAS_BOOK) ? null : super.getMenuProvider(p_54571_, p_54572_, p_54573_);
    }

    private void openScreen(Level p_54485_, BlockPos p_54486_, Player p_54487_) {
        BlockEntity blockentity = p_54485_.getBlockEntity(p_54486_);
        if (blockentity instanceof LecternBlockEntity) {
            p_54487_.openMenu((LecternBlockEntity)blockentity);
            p_54487_.awardStat(Stats.INTERACT_WITH_LECTERN);
        }
    }

    @Override
    protected boolean isPathfindable(BlockState p_54510_, PathComputationType p_54513_) {
        return false;
    }
}