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

package net.minecraft.world.level.block;

import com.google.common.collect.Lists;
import com.mojang.serialization.MapCodec;
import java.util.List;
import java.util.Map;
import java.util.WeakHashMap;
import net.minecraft.core.BlockPos;
import net.minecraft.core.Direction;
import net.minecraft.core.particles.DustParticleOptions;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.util.RandomSource;
import net.minecraft.world.level.BlockGetter;
import net.minecraft.world.level.Level;
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;

public class RedstoneTorchBlock extends BaseTorchBlock {
	public static final MapCodec<RedstoneTorchBlock> CODEC = simpleCodec(RedstoneTorchBlock::new);
	public static final BooleanProperty LIT = BlockStateProperties.LIT;
	private static final Map<BlockGetter, List<RedstoneTorchBlock.Toggle>> RECENT_TOGGLES = new WeakHashMap();
	public static final int RECENT_TOGGLE_TIMER = 60;
	public static final int MAX_RECENT_TOGGLES = 8;
	public static final int RESTART_DELAY = 160;
	private static final int TOGGLE_DELAY = 2;

	@Override
	public MapCodec<? extends RedstoneTorchBlock> codec() {
		return CODEC;
	}

	protected RedstoneTorchBlock(BlockBehaviour.Properties properties) {
		super(properties);
		this.registerDefaultState(this.stateDefinition.any().setValue(LIT, true));
	}

	@Override
	protected void onPlace(BlockState state, Level level, BlockPos pos, BlockState oldState, boolean movedByPiston) {
		for (Direction direction : Direction.values()) {
			level.updateNeighborsAt(pos.relative(direction), this);
		}
	}

	@Override
	protected void onRemove(BlockState state, Level level, BlockPos pos, BlockState newState, boolean movedByPiston) {
		if (!movedByPiston) {
			for (Direction direction : Direction.values()) {
				level.updateNeighborsAt(pos.relative(direction), this);
			}
		}
	}

	@Override
	protected int getSignal(BlockState state, BlockGetter level, BlockPos pos, Direction direction) {
		return state.getValue(LIT) && Direction.UP != direction ? 15 : 0;
	}

	protected boolean hasNeighborSignal(Level level, BlockPos pos, BlockState state) {
		return level.hasSignal(pos.below(), Direction.DOWN);
	}

	@Override
	protected void tick(BlockState state, ServerLevel level, BlockPos pos, RandomSource random) {
		boolean bl = this.hasNeighborSignal(level, pos, state);
		List<RedstoneTorchBlock.Toggle> list = (List<RedstoneTorchBlock.Toggle>)RECENT_TOGGLES.get(level);

		while (list != null && !list.isEmpty() && level.getGameTime() - ((RedstoneTorchBlock.Toggle)list.get(0)).when > 60L) {
			list.remove(0);
		}

		if ((Boolean)state.getValue(LIT)) {
			if (bl) {
				level.setBlock(pos, state.setValue(LIT, false), 3);
				if (isToggledTooFrequently(level, pos, true)) {
					level.levelEvent(1502, pos, 0);
					level.scheduleTick(pos, level.getBlockState(pos).getBlock(), 160);
				}
			}
		} else if (!bl && !isToggledTooFrequently(level, pos, false)) {
			level.setBlock(pos, state.setValue(LIT, true), 3);
		}
	}

	@Override
	protected void neighborChanged(BlockState state, Level level, BlockPos pos, Block neighborBlock, BlockPos neighborPos, boolean movedByPiston) {
		if ((Boolean)state.getValue(LIT) == this.hasNeighborSignal(level, pos, state) && !level.getBlockTicks().willTickThisTick(pos, this)) {
			level.scheduleTick(pos, this, 2);
		}
	}

	@Override
	protected int getDirectSignal(BlockState state, BlockGetter level, BlockPos pos, Direction direction) {
		return direction == Direction.DOWN ? state.getSignal(level, pos, direction) : 0;
	}

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

	@Override
	public void animateTick(BlockState state, Level level, BlockPos pos, RandomSource random) {
		if ((Boolean)state.getValue(LIT)) {
			double d = pos.getX() + 0.5 + (random.nextDouble() - 0.5) * 0.2;
			double e = pos.getY() + 0.7 + (random.nextDouble() - 0.5) * 0.2;
			double f = pos.getZ() + 0.5 + (random.nextDouble() - 0.5) * 0.2;
			level.addParticle(DustParticleOptions.REDSTONE, d, e, f, 0.0, 0.0, 0.0);
		}
	}

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

	private static boolean isToggledTooFrequently(Level level, BlockPos pos, boolean logToggle) {
		List<RedstoneTorchBlock.Toggle> list = (List<RedstoneTorchBlock.Toggle>)RECENT_TOGGLES.computeIfAbsent(level, blockGetter -> Lists.newArrayList());
		if (logToggle) {
			list.add(new RedstoneTorchBlock.Toggle(pos.immutable(), level.getGameTime()));
		}

		int i = 0;

		for (RedstoneTorchBlock.Toggle toggle : list) {
			if (toggle.pos.equals(pos)) {
				if (++i >= 8) {
					return true;
				}
			}
		}

		return false;
	}

	public static class Toggle {
		final BlockPos pos;
		final long when;

		public Toggle(BlockPos pos, long when) {
			this.pos = pos;
			this.when = when;
		}
	}
}