Code/net/minecraft/gametest/framework/StructureUtils.java

package net.minecraft.gametest.framework;

import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Optional;
import java.util.stream.Stream;
import net.minecraft.commands.arguments.blocks.BlockInput;
import net.minecraft.core.BlockPos;
import net.minecraft.core.Vec3i;
import net.minecraft.core.registries.Registries;
import net.minecraft.resources.ResourceKey;
import net.minecraft.resources.ResourceLocation;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.world.entity.Entity;
import net.minecraft.world.entity.player.Player;
import net.minecraft.world.level.block.Blocks;
import net.minecraft.world.level.block.Mirror;
import net.minecraft.world.level.block.Rotation;
import net.minecraft.world.level.block.entity.BlockEntity;
import net.minecraft.world.level.block.entity.BlockEntityType;
import net.minecraft.world.level.block.entity.TestInstanceBlockEntity;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.level.levelgen.Heightmap;
import net.minecraft.world.level.levelgen.structure.BoundingBox;
import net.minecraft.world.level.levelgen.structure.templatesystem.StructureTemplate;
import net.minecraft.world.phys.AABB;
import net.minecraft.world.phys.Vec3;

public class StructureUtils {
    public static final int DEFAULT_Y_SEARCH_RADIUS = 10;
    public static final String DEFAULT_TEST_STRUCTURES_DIR = "Minecraft.Server/src/test/convertables/data";
    public static Path testStructuresDir = Paths.get("Minecraft.Server/src/test/convertables/data");

    public static Rotation getRotationForRotationSteps(int p_127836_) {
        switch (p_127836_) {
            case 0:
                return Rotation.NONE;
            case 1:
                return Rotation.CLOCKWISE_90;
            case 2:
                return Rotation.CLOCKWISE_180;
            case 3:
                return Rotation.COUNTERCLOCKWISE_90;
            default:
                throw new IllegalArgumentException("rotationSteps must be a value from 0-3. Got value " + p_127836_);
        }
    }

    public static int getRotationStepsForRotation(Rotation p_177752_) {
        switch (p_177752_) {
            case NONE:
                return 0;
            case CLOCKWISE_90:
                return 1;
            case CLOCKWISE_180:
                return 2;
            case COUNTERCLOCKWISE_90:
                return 3;
            default:
                throw new IllegalArgumentException("Unknown rotation value, don't know how many steps it represents: " + p_177752_);
        }
    }

    public static TestInstanceBlockEntity createNewEmptyTest(ResourceLocation p_397704_, BlockPos p_391956_, Vec3i p_394926_, Rotation p_395782_, ServerLevel p_396943_) {
        BoundingBox boundingbox = getStructureBoundingBox(TestInstanceBlockEntity.getStructurePos(p_391956_), p_394926_, p_395782_);
        clearSpaceForStructure(boundingbox, p_396943_);
        p_396943_.setBlockAndUpdate(p_391956_, Blocks.TEST_INSTANCE_BLOCK.defaultBlockState());
        TestInstanceBlockEntity testinstanceblockentity = (TestInstanceBlockEntity)p_396943_.getBlockEntity(p_391956_);
        ResourceKey<GameTestInstance> resourcekey = ResourceKey.create(Registries.TEST_INSTANCE, p_397704_);
        testinstanceblockentity.set(
            new TestInstanceBlockEntity.Data(Optional.of(resourcekey), p_394926_, p_395782_, false, TestInstanceBlockEntity.Status.CLEARED, Optional.empty())
        );
        return testinstanceblockentity;
    }

    public static void clearSpaceForStructure(BoundingBox p_127850_, ServerLevel p_127852_) {
        int i = p_127850_.minY() - 1;
        BoundingBox boundingbox = new BoundingBox(
            p_127850_.minX() - 2,
            p_127850_.minY() - 3,
            p_127850_.minZ() - 3,
            p_127850_.maxX() + 3,
            p_127850_.maxY() + 20,
            p_127850_.maxZ() + 3
        );
        BlockPos.betweenClosedStream(boundingbox).forEach(p_177748_ -> clearBlock(i, p_177748_, p_127852_));
        p_127852_.getBlockTicks().clearArea(boundingbox);
        p_127852_.clearBlockEvents(boundingbox);
        AABB aabb = AABB.of(boundingbox);
        List<Entity> list = p_127852_.getEntitiesOfClass(Entity.class, aabb, p_177750_ -> !(p_177750_ instanceof Player));
        list.forEach(Entity::discard);
    }

    public static BlockPos getTransformedFarCorner(BlockPos p_310098_, Vec3i p_312132_, Rotation p_309587_) {
        BlockPos blockpos = p_310098_.offset(p_312132_).offset(-1, -1, -1);
        return StructureTemplate.transform(blockpos, Mirror.NONE, p_309587_, p_310098_);
    }

    public static BoundingBox getStructureBoundingBox(BlockPos p_177761_, Vec3i p_177762_, Rotation p_177763_) {
        BlockPos blockpos = getTransformedFarCorner(p_177761_, p_177762_, p_177763_);
        BoundingBox boundingbox = BoundingBox.fromCorners(p_177761_, blockpos);
        int i = Math.min(boundingbox.minX(), boundingbox.maxX());
        int j = Math.min(boundingbox.minZ(), boundingbox.maxZ());
        return boundingbox.move(p_177761_.getX() - i, 0, p_177761_.getZ() - j);
    }

    public static Optional<BlockPos> findTestContainingPos(BlockPos p_396694_, int p_391597_, ServerLevel p_393804_) {
        return findTestBlocks(p_396694_, p_391597_, p_393804_).filter(p_177756_ -> doesStructureContain(p_177756_, p_396694_, p_393804_)).findFirst();
    }

    public static Optional<BlockPos> findNearestTest(BlockPos p_397473_, int p_391969_, ServerLevel p_395973_) {
        Comparator<BlockPos> comparator = Comparator.comparingInt(p_177759_ -> p_177759_.distManhattan(p_397473_));
        return findTestBlocks(p_397473_, p_391969_, p_395973_).min(comparator);
    }

    public static Stream<BlockPos> findTestBlocks(BlockPos p_127911_, int p_127912_, ServerLevel p_127913_) {
        BoundingBox boundingbox = getBoundingBoxAtGround(p_127911_, p_127912_, p_127913_);
        return BlockPos.betweenClosedStream(boundingbox).filter(p_389789_ -> p_127913_.getBlockState(p_389789_).is(Blocks.TEST_INSTANCE_BLOCK)).map(BlockPos::immutable);
    }

    private static BoundingBox getBoundingBoxAtGround(BlockPos p_329849_, int p_332427_, ServerLevel p_328726_) {
        BlockPos blockpos = BlockPos.containing(
            p_329849_.getX(), p_328726_.getHeightmapPos(Heightmap.Types.WORLD_SURFACE, p_329849_).getY(), p_329849_.getZ()
        );
        return new BoundingBox(blockpos).inflatedBy(p_332427_, 10, p_332427_);
    }

    public static Stream<BlockPos> lookedAtTestPos(BlockPos p_393627_, Entity p_395264_, ServerLevel p_392963_) {
        int i = 200;
        Vec3 vec3 = p_395264_.getEyePosition();
        Vec3 vec31 = vec3.add(p_395264_.getLookAngle().scale(200.0));
        return findTestBlocks(p_393627_, 200, p_392963_)
            .map(p_389787_ -> p_392963_.getBlockEntity(p_389787_, BlockEntityType.TEST_INSTANCE_BLOCK))
            .flatMap(Optional::stream)
            .filter(p_389792_ -> p_389792_.getStructureBounds().clip(vec3, vec31).isPresent())
            .map(BlockEntity::getBlockPos)
            .sorted(Comparator.comparing(p_393627_::distSqr))
            .limit(1L);
    }

    private static void clearBlock(int p_127842_, BlockPos p_127843_, ServerLevel p_127844_) {
        BlockState blockstate;
        if (p_127843_.getY() < p_127842_) {
            blockstate = Blocks.STONE.defaultBlockState();
        } else {
            blockstate = Blocks.AIR.defaultBlockState();
        }

        BlockInput blockinput = new BlockInput(blockstate, Collections.emptySet(), null);
        blockinput.place(p_127844_, p_127843_, 818);
        p_127844_.updateNeighborsAt(p_127843_, blockstate.getBlock());
    }

    private static boolean doesStructureContain(BlockPos p_127868_, BlockPos p_127869_, ServerLevel p_127870_) {
        return p_127870_.getBlockEntity(p_127868_) instanceof TestInstanceBlockEntity testinstanceblockentity
            ? testinstanceblockentity.getStructureBoundingBox().isInside(p_127869_)
            : false;
    }
}