Code/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 com.mojang.serialization.codecs.RecordCodecBuilder.Instance;
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(
        p_225856_ -> rootPlacerParts(p_225856_)
            .and(MangroveRootPlacement.CODEC.fieldOf("mangrove_root_placement").forGetter(p_225849_ -> p_225849_.mangroveRootPlacement))
            .apply(p_225856_, MangroveRootPlacer::new)
    );
    private final MangroveRootPlacement mangroveRootPlacement;

    public MangroveRootPlacer(IntProvider p_225817_, BlockStateProvider p_225818_, Optional<AboveRootPlacement> p_225819_, MangroveRootPlacement p_225820_) {
        super(p_225817_, p_225818_, p_225819_);
        this.mangroveRootPlacement = p_225820_;
    }

    @Override
    public boolean placeRoots(
        LevelSimulatedReader p_225840_,
        BiConsumer<BlockPos, BlockState> p_225841_,
        RandomSource p_225842_,
        BlockPos p_225843_,
        BlockPos p_225844_,
        TreeConfiguration p_225845_
    ) {
        List<BlockPos> list = Lists.newArrayList();
        BlockPos.MutableBlockPos blockpos$mutableblockpos = p_225843_.mutable();

        while (blockpos$mutableblockpos.getY() < p_225844_.getY()) {
            if (!this.canPlaceRoot(p_225840_, blockpos$mutableblockpos)) {
                return false;
            }

            blockpos$mutableblockpos.move(Direction.UP);
        }

        list.add(p_225844_.below());

        for (Direction direction : Direction.Plane.HORIZONTAL) {
            BlockPos blockpos = p_225844_.relative(direction);
            List<BlockPos> list1 = Lists.newArrayList();
            if (!this.simulateRoots(p_225840_, p_225842_, blockpos, direction, p_225844_, list1, 0)) {
                return false;
            }

            list.addAll(list1);
            list.add(p_225844_.relative(direction));
        }

        for (BlockPos blockpos1 : list) {
            this.placeRoot(p_225840_, p_225841_, p_225842_, blockpos1, p_225845_);
        }

        return true;
    }

    private boolean simulateRoots(
        LevelSimulatedReader p_225823_,
        RandomSource p_225824_,
        BlockPos p_225825_,
        Direction p_225826_,
        BlockPos p_225827_,
        List<BlockPos> p_225828_,
        int p_225829_
    ) {
        int i = this.mangroveRootPlacement.maxRootLength();
        if (p_225829_ != i && p_225828_.size() <= i) {
            for (BlockPos blockpos : this.potentialRootPositions(p_225825_, p_225826_, p_225824_, p_225827_)) {
                if (this.canPlaceRoot(p_225823_, blockpos)) {
                    p_225828_.add(blockpos);
                    if (!this.simulateRoots(p_225823_, p_225824_, blockpos, p_225826_, p_225827_, p_225828_, p_225829_ + 1)) {
                        return false;
                    }
                }
            }

            return true;
        } else {
            return false;
        }
    }

    protected List<BlockPos> potentialRootPositions(BlockPos p_225851_, Direction p_225852_, RandomSource p_225853_, BlockPos p_225854_) {
        BlockPos blockpos = p_225851_.below();
        BlockPos blockpos1 = p_225851_.relative(p_225852_);
        int i = p_225851_.distManhattan(p_225854_);
        int j = this.mangroveRootPlacement.maxRootWidth();
        float f = this.mangroveRootPlacement.randomSkewChance();
        if (i > j - 3 && i <= j) {
            return p_225853_.nextFloat() < f ? List.of(blockpos, blockpos1.below()) : List.of(blockpos);
        } else if (i > j) {
            return List.of(blockpos);
        } else if (p_225853_.nextFloat() < f) {
            return List.of(blockpos);
        } else {
            return p_225853_.nextBoolean() ? List.of(blockpos1) : List.of(blockpos);
        }
    }

    @Override
    protected boolean canPlaceRoot(LevelSimulatedReader p_225831_, BlockPos p_225832_) {
        return super.canPlaceRoot(p_225831_, p_225832_) || p_225831_.isStateAtPosition(p_225832_, p_225858_ -> p_225858_.is(this.mangroveRootPlacement.canGrowThrough()));
    }

    @Override
    protected void placeRoot(
        LevelSimulatedReader p_225834_, BiConsumer<BlockPos, BlockState> p_225835_, RandomSource p_225836_, BlockPos p_225837_, TreeConfiguration p_225838_
    ) {
        if (p_225834_.isStateAtPosition(p_225837_, p_225847_ -> p_225847_.is(this.mangroveRootPlacement.muddyRootsIn()))) {
            BlockState blockstate = this.mangroveRootPlacement.muddyRootsProvider().getState(p_225836_, p_225837_);
            p_225835_.accept(p_225837_, this.getPotentiallyWaterloggedState(p_225834_, p_225837_, blockstate));
        } else {
            super.placeRoot(p_225834_, p_225835_, p_225836_, p_225837_, p_225838_);
        }
    }

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