minecraft-src/net/minecraft/world/level/levelgen/feature/rootplacers/MangroveRootPlacer.java

package net.minecraft.world.level.levelgen.feature.rootplacers;

import com.google.common.collect.Lists;
import com.mojang.serialization.MapCodec;
import com.mojang.serialization.codecs.RecordCodecBuilder;
import java.util.List;
import java.util.Optional;
import java.util.function.BiConsumer;
import net.minecraft.core.BlockPos;
import net.minecraft.core.Direction;
import net.minecraft.util.RandomSource;
import net.minecraft.util.valueproviders.IntProvider;
import net.minecraft.world.level.LevelSimulatedReader;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.level.levelgen.feature.configurations.TreeConfiguration;
import net.minecraft.world.level.levelgen.feature.stateproviders.BlockStateProvider;

public class MangroveRootPlacer extends RootPlacer {
	public static final int ROOT_WIDTH_LIMIT = 8;
	public static final int ROOT_LENGTH_LIMIT = 15;
	public static final MapCodec<MangroveRootPlacer> CODEC = RecordCodecBuilder.mapCodec(
		instance -> rootPlacerParts(instance)
			.and(MangroveRootPlacement.CODEC.fieldOf("mangrove_root_placement").forGetter(mangroveRootPlacer -> mangroveRootPlacer.mangroveRootPlacement))
			.apply(instance, MangroveRootPlacer::new)
	);
	private final MangroveRootPlacement mangroveRootPlacement;

	public MangroveRootPlacer(
		IntProvider trunkOffset, BlockStateProvider rootProvider, Optional<AboveRootPlacement> aboveRootPlacement, MangroveRootPlacement mangroveRootPlacement
	) {
		super(trunkOffset, rootProvider, aboveRootPlacement);
		this.mangroveRootPlacement = mangroveRootPlacement;
	}

	@Override
	public boolean placeRoots(
		LevelSimulatedReader level,
		BiConsumer<BlockPos, BlockState> blockSetter,
		RandomSource random,
		BlockPos pos,
		BlockPos trunkOrigin,
		TreeConfiguration treeConfig
	) {
		List<BlockPos> list = Lists.<BlockPos>newArrayList();
		BlockPos.MutableBlockPos mutableBlockPos = pos.mutable();

		while (mutableBlockPos.getY() < trunkOrigin.getY()) {
			if (!this.canPlaceRoot(level, mutableBlockPos)) {
				return false;
			}

			mutableBlockPos.move(Direction.UP);
		}

		list.add(trunkOrigin.below());

		for (Direction direction : Direction.Plane.HORIZONTAL) {
			BlockPos blockPos = trunkOrigin.relative(direction);
			List<BlockPos> list2 = Lists.<BlockPos>newArrayList();
			if (!this.simulateRoots(level, random, blockPos, direction, trunkOrigin, list2, 0)) {
				return false;
			}

			list.addAll(list2);
			list.add(trunkOrigin.relative(direction));
		}

		for (BlockPos blockPos2 : list) {
			this.placeRoot(level, blockSetter, random, blockPos2, treeConfig);
		}

		return true;
	}

	private boolean simulateRoots(
		LevelSimulatedReader level, RandomSource random, BlockPos pos, Direction direction, BlockPos trunkOrigin, List<BlockPos> roots, int length
	) {
		int i = this.mangroveRootPlacement.maxRootLength();
		if (length != i && roots.size() <= i) {
			for (BlockPos blockPos : this.potentialRootPositions(pos, direction, random, trunkOrigin)) {
				if (this.canPlaceRoot(level, blockPos)) {
					roots.add(blockPos);
					if (!this.simulateRoots(level, random, blockPos, direction, trunkOrigin, roots, length + 1)) {
						return false;
					}
				}
			}

			return true;
		} else {
			return false;
		}
	}

	protected List<BlockPos> potentialRootPositions(BlockPos pos, Direction direction, RandomSource random, BlockPos trunkOrigin) {
		BlockPos blockPos = pos.below();
		BlockPos blockPos2 = pos.relative(direction);
		int i = pos.distManhattan(trunkOrigin);
		int j = this.mangroveRootPlacement.maxRootWidth();
		float f = this.mangroveRootPlacement.randomSkewChance();
		if (i > j - 3 && i <= j) {
			return random.nextFloat() < f ? List.of(blockPos, blockPos2.below()) : List.of(blockPos);
		} else if (i > j) {
			return List.of(blockPos);
		} else if (random.nextFloat() < f) {
			return List.of(blockPos);
		} else {
			return random.nextBoolean() ? List.of(blockPos2) : List.of(blockPos);
		}
	}

	@Override
	protected boolean canPlaceRoot(LevelSimulatedReader level, BlockPos pos) {
		return super.canPlaceRoot(level, pos) || level.isStateAtPosition(pos, blockState -> blockState.is(this.mangroveRootPlacement.canGrowThrough()));
	}

	@Override
	protected void placeRoot(
		LevelSimulatedReader level, BiConsumer<BlockPos, BlockState> blockSetter, RandomSource random, BlockPos pos, TreeConfiguration treeConfig
	) {
		if (level.isStateAtPosition(pos, blockStatex -> blockStatex.is(this.mangroveRootPlacement.muddyRootsIn()))) {
			BlockState blockState = this.mangroveRootPlacement.muddyRootsProvider().getState(random, pos);
			blockSetter.accept(pos, this.getPotentiallyWaterloggedState(level, pos, blockState));
		} else {
			super.placeRoot(level, blockSetter, random, pos, treeConfig);
		}
	}

	@Override
	protected RootPlacerType<?> type() {
		return RootPlacerType.MANGROVE_ROOT_PLACER;
	}
}