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

package net.minecraft.world.level.block;

import com.mojang.serialization.MapCodec;
import net.minecraft.core.BlockPos;
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;
import net.minecraft.world.level.block.state.properties.EnumProperty;
import net.minecraft.world.level.block.state.properties.Property;
import net.minecraft.world.level.block.state.properties.RailShape;

public class PoweredRailBlock extends BaseRailBlock {
	public static final MapCodec<PoweredRailBlock> CODEC = simpleCodec(PoweredRailBlock::new);
	public static final EnumProperty<RailShape> SHAPE = BlockStateProperties.RAIL_SHAPE_STRAIGHT;
	public static final BooleanProperty POWERED = BlockStateProperties.POWERED;

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

	protected PoweredRailBlock(BlockBehaviour.Properties properties) {
		super(true, properties);
		this.registerDefaultState(this.stateDefinition.any().setValue(SHAPE, RailShape.NORTH_SOUTH).setValue(POWERED, false).setValue(WATERLOGGED, false));
	}

	protected boolean findPoweredRailSignal(Level level, BlockPos pos, BlockState state, boolean searchForward, int recursionCount) {
		if (recursionCount >= 8) {
			return false;
		} else {
			int i = pos.getX();
			int j = pos.getY();
			int k = pos.getZ();
			boolean bl = true;
			RailShape railShape = state.getValue(SHAPE);
			switch (railShape) {
				case NORTH_SOUTH:
					if (searchForward) {
						k++;
					} else {
						k--;
					}
					break;
				case EAST_WEST:
					if (searchForward) {
						i--;
					} else {
						i++;
					}
					break;
				case ASCENDING_EAST:
					if (searchForward) {
						i--;
					} else {
						i++;
						j++;
						bl = false;
					}

					railShape = RailShape.EAST_WEST;
					break;
				case ASCENDING_WEST:
					if (searchForward) {
						i--;
						j++;
						bl = false;
					} else {
						i++;
					}

					railShape = RailShape.EAST_WEST;
					break;
				case ASCENDING_NORTH:
					if (searchForward) {
						k++;
					} else {
						k--;
						j++;
						bl = false;
					}

					railShape = RailShape.NORTH_SOUTH;
					break;
				case ASCENDING_SOUTH:
					if (searchForward) {
						k++;
						j++;
						bl = false;
					} else {
						k--;
					}

					railShape = RailShape.NORTH_SOUTH;
			}

			return this.isSameRailWithPower(level, new BlockPos(i, j, k), searchForward, recursionCount, railShape)
				? true
				: bl && this.isSameRailWithPower(level, new BlockPos(i, j - 1, k), searchForward, recursionCount, railShape);
		}
	}

	protected boolean isSameRailWithPower(Level level, BlockPos state, boolean searchForward, int recursionCount, RailShape shape) {
		BlockState blockState = level.getBlockState(state);
		if (!blockState.is(this)) {
			return false;
		} else {
			RailShape railShape = blockState.getValue(SHAPE);
			if (shape != RailShape.EAST_WEST || railShape != RailShape.NORTH_SOUTH && railShape != RailShape.ASCENDING_NORTH && railShape != RailShape.ASCENDING_SOUTH) {
				if (shape != RailShape.NORTH_SOUTH || railShape != RailShape.EAST_WEST && railShape != RailShape.ASCENDING_EAST && railShape != RailShape.ASCENDING_WEST) {
					if (!(Boolean)blockState.getValue(POWERED)) {
						return false;
					} else {
						return level.hasNeighborSignal(state) ? true : this.findPoweredRailSignal(level, state, blockState, searchForward, recursionCount + 1);
					}
				} else {
					return false;
				}
			} else {
				return false;
			}
		}
	}

	@Override
	protected void updateState(BlockState state, Level level, BlockPos pos, Block neighborBlock) {
		boolean bl = (Boolean)state.getValue(POWERED);
		boolean bl2 = level.hasNeighborSignal(pos)
			|| this.findPoweredRailSignal(level, pos, state, true, 0)
			|| this.findPoweredRailSignal(level, pos, state, false, 0);
		if (bl2 != bl) {
			level.setBlock(pos, state.setValue(POWERED, bl2), 3);
			level.updateNeighborsAt(pos.below(), this);
			if (((RailShape)state.getValue(SHAPE)).isSlope()) {
				level.updateNeighborsAt(pos.above(), this);
			}
		}
	}

	@Override
	public Property<RailShape> getShapeProperty() {
		return SHAPE;
	}

	@Override
	protected BlockState rotate(BlockState state, Rotation rotation) {
		RailShape railShape = state.getValue(SHAPE);
		RailShape railShape2 = this.rotate(railShape, rotation);
		return state.setValue(SHAPE, railShape2);
	}

	@Override
	protected BlockState mirror(BlockState state, Mirror mirror) {
		RailShape railShape = state.getValue(SHAPE);
		RailShape railShape2 = this.mirror(railShape, mirror);
		return state.setValue(SHAPE, railShape2);
	}

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