Code/net/minecraft/world/level/redstone/Orientation.java

package net.minecraft.world.level.redstone;

import com.google.common.annotations.VisibleForTesting;
import io.netty.buffer.ByteBuf;
import java.util.EnumMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import net.minecraft.Util;
import net.minecraft.core.Direction;
import net.minecraft.core.Vec3i;
import net.minecraft.network.codec.ByteBufCodecs;
import net.minecraft.network.codec.StreamCodec;
import net.minecraft.util.RandomSource;

public class Orientation {
    public static final StreamCodec<ByteBuf, Orientation> STREAM_CODEC = ByteBufCodecs.idMapper(Orientation::fromIndex, Orientation::getIndex);
    private static final Orientation[] ORIENTATIONS = Util.make(() -> {
        Orientation[] aorientation = new Orientation[48];
        generateContext(new Orientation(Direction.UP, Direction.NORTH, Orientation.SideBias.LEFT), aorientation);
        return aorientation;
    });
    private final Direction up;
    private final Direction front;
    private final Direction side;
    private final Orientation.SideBias sideBias;
    private final int index;
    private final List<Direction> neighbors;
    private final List<Direction> horizontalNeighbors;
    private final List<Direction> verticalNeighbors;
    private final Map<Direction, Orientation> withFront = new EnumMap<>(Direction.class);
    private final Map<Direction, Orientation> withUp = new EnumMap<>(Direction.class);
    private final Map<Orientation.SideBias, Orientation> withSideBias = new EnumMap<>(Orientation.SideBias.class);

    private Orientation(Direction p_370197_, Direction p_369849_, Orientation.SideBias p_366338_) {
        this.up = p_370197_;
        this.front = p_369849_;
        this.sideBias = p_366338_;
        this.index = generateIndex(p_370197_, p_369849_, p_366338_);
        Vec3i vec3i = p_369849_.getUnitVec3i().cross(p_370197_.getUnitVec3i());
        Direction direction = Direction.getNearest(vec3i, null);
        Objects.requireNonNull(direction);
        if (this.sideBias == Orientation.SideBias.RIGHT) {
            this.side = direction;
        } else {
            this.side = direction.getOpposite();
        }

        this.neighbors = List.of(
            this.front.getOpposite(), this.front, this.side, this.side.getOpposite(), this.up.getOpposite(), this.up
        );
        this.horizontalNeighbors = this.neighbors.stream().filter(p_363625_ -> p_363625_.getAxis() != this.up.getAxis()).toList();
        this.verticalNeighbors = this.neighbors.stream().filter(p_365283_ -> p_365283_.getAxis() == this.up.getAxis()).toList();
    }

    public static Orientation of(Direction p_367835_, Direction p_362776_, Orientation.SideBias p_367906_) {
        return ORIENTATIONS[generateIndex(p_367835_, p_362776_, p_367906_)];
    }

    public Orientation withUp(Direction p_368311_) {
        return this.withUp.get(p_368311_);
    }

    public Orientation withFront(Direction p_366881_) {
        return this.withFront.get(p_366881_);
    }

    public Orientation withFrontPreserveUp(Direction p_364290_) {
        return p_364290_.getAxis() == this.up.getAxis() ? this : this.withFront.get(p_364290_);
    }

    public Orientation withFrontAdjustSideBias(Direction p_367524_) {
        Orientation orientation = this.withFront(p_367524_);
        return this.front == orientation.side ? orientation.withMirror() : orientation;
    }

    public Orientation withSideBias(Orientation.SideBias p_365192_) {
        return this.withSideBias.get(p_365192_);
    }

    public Orientation withMirror() {
        return this.withSideBias(this.sideBias.getOpposite());
    }

    public Direction getFront() {
        return this.front;
    }

    public Direction getUp() {
        return this.up;
    }

    public Direction getSide() {
        return this.side;
    }

    public Orientation.SideBias getSideBias() {
        return this.sideBias;
    }

    public List<Direction> getDirections() {
        return this.neighbors;
    }

    public List<Direction> getHorizontalDirections() {
        return this.horizontalNeighbors;
    }

    public List<Direction> getVerticalDirections() {
        return this.verticalNeighbors;
    }

    @Override
    public String toString() {
        return "[up=" + this.up + ",front=" + this.front + ",sideBias=" + this.sideBias + "]";
    }

    public int getIndex() {
        return this.index;
    }

    public static Orientation fromIndex(int p_367043_) {
        return ORIENTATIONS[p_367043_];
    }

    public static Orientation random(RandomSource p_363137_) {
        return Util.getRandom(ORIENTATIONS, p_363137_);
    }

    private static Orientation generateContext(Orientation p_365452_, Orientation[] p_362094_) {
        if (p_362094_[p_365452_.getIndex()] != null) {
            return p_362094_[p_365452_.getIndex()];
        } else {
            p_362094_[p_365452_.getIndex()] = p_365452_;

            for (Orientation.SideBias orientation$sidebias : Orientation.SideBias.values()) {
                p_365452_.withSideBias
                    .put(orientation$sidebias, generateContext(new Orientation(p_365452_.up, p_365452_.front, orientation$sidebias), p_362094_));
            }

            for (Direction direction1 : Direction.values()) {
                Direction direction = p_365452_.up;
                if (direction1 == p_365452_.up) {
                    direction = p_365452_.front.getOpposite();
                }

                if (direction1 == p_365452_.up.getOpposite()) {
                    direction = p_365452_.front;
                }

                p_365452_.withFront.put(direction1, generateContext(new Orientation(direction, direction1, p_365452_.sideBias), p_362094_));
            }

            for (Direction direction2 : Direction.values()) {
                Direction direction3 = p_365452_.front;
                if (direction2 == p_365452_.front) {
                    direction3 = p_365452_.up.getOpposite();
                }

                if (direction2 == p_365452_.front.getOpposite()) {
                    direction3 = p_365452_.up;
                }

                p_365452_.withUp.put(direction2, generateContext(new Orientation(direction2, direction3, p_365452_.sideBias), p_362094_));
            }

            return p_365452_;
        }
    }

    @VisibleForTesting
    protected static int generateIndex(Direction p_368123_, Direction p_368048_, Orientation.SideBias p_369086_) {
        if (p_368123_.getAxis() == p_368048_.getAxis()) {
            throw new IllegalStateException("Up-vector and front-vector can not be on the same axis");
        } else {
            int i;
            if (p_368123_.getAxis() == Direction.Axis.Y) {
                i = p_368048_.getAxis() == Direction.Axis.X ? 1 : 0;
            } else {
                i = p_368048_.getAxis() == Direction.Axis.Y ? 1 : 0;
            }

            int j = i << 1 | p_368048_.getAxisDirection().ordinal();
            return ((p_368123_.ordinal() << 2) + j << 1) + p_369086_.ordinal();
        }
    }

    public static enum SideBias {
        LEFT("left"),
        RIGHT("right");

        private final String name;

        private SideBias(final String p_365296_) {
            this.name = p_365296_;
        }

        public Orientation.SideBias getOpposite() {
            return this == LEFT ? RIGHT : LEFT;
        }

        @Override
        public String toString() {
            return this.name;
        }
    }
}