Code/net/minecraft/world/level/block/FrogspawnBlock.java

package net.minecraft.world.level.block;

import com.google.common.annotations.VisibleForTesting;
import com.mojang.serialization.MapCodec;
import net.minecraft.core.BlockPos;
import net.minecraft.core.Direction;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.sounds.SoundEvents;
import net.minecraft.sounds.SoundSource;
import net.minecraft.util.Mth;
import net.minecraft.util.RandomSource;
import net.minecraft.world.entity.Entity;
import net.minecraft.world.entity.EntitySpawnReason;
import net.minecraft.world.entity.EntityType;
import net.minecraft.world.entity.InsideBlockEffectApplier;
import net.minecraft.world.entity.animal.frog.Tadpole;
import net.minecraft.world.level.BlockGetter;
import net.minecraft.world.level.Level;
import net.minecraft.world.level.LevelReader;
import net.minecraft.world.level.ScheduledTickAccess;
import net.minecraft.world.level.block.state.BlockBehaviour;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.level.material.FluidState;
import net.minecraft.world.level.material.Fluids;
import net.minecraft.world.phys.shapes.CollisionContext;
import net.minecraft.world.phys.shapes.VoxelShape;

public class FrogspawnBlock extends Block {
    public static final MapCodec<FrogspawnBlock> CODEC = simpleCodec(FrogspawnBlock::new);
    private static final int MIN_TADPOLES_SPAWN = 2;
    private static final int MAX_TADPOLES_SPAWN = 5;
    private static final int DEFAULT_MIN_HATCH_TICK_DELAY = 3600;
    private static final int DEFAULT_MAX_HATCH_TICK_DELAY = 12000;
    private static final VoxelShape SHAPE = Block.column(16.0, 0.0, 1.5);
    private static int minHatchTickDelay = 3600;
    private static int maxHatchTickDelay = 12000;

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

    public FrogspawnBlock(BlockBehaviour.Properties p_221177_) {
        super(p_221177_);
    }

    @Override
    protected VoxelShape getShape(BlockState p_221199_, BlockGetter p_221200_, BlockPos p_221201_, CollisionContext p_221202_) {
        return SHAPE;
    }

    @Override
    protected boolean canSurvive(BlockState p_221209_, LevelReader p_221210_, BlockPos p_221211_) {
        return mayPlaceOn(p_221210_, p_221211_.below());
    }

    @Override
    protected void onPlace(BlockState p_221227_, Level p_221228_, BlockPos p_221229_, BlockState p_221230_, boolean p_221231_) {
        p_221228_.scheduleTick(p_221229_, this, getFrogspawnHatchDelay(p_221228_.getRandom()));
    }

    private static int getFrogspawnHatchDelay(RandomSource p_221186_) {
        return p_221186_.nextInt(minHatchTickDelay, maxHatchTickDelay);
    }

    @Override
    protected BlockState updateShape(
        BlockState p_221213_,
        LevelReader p_365824_,
        ScheduledTickAccess p_361762_,
        BlockPos p_221217_,
        Direction p_221214_,
        BlockPos p_221218_,
        BlockState p_221215_,
        RandomSource p_364719_
    ) {
        return !this.canSurvive(p_221213_, p_365824_, p_221217_)
            ? Blocks.AIR.defaultBlockState()
            : super.updateShape(p_221213_, p_365824_, p_361762_, p_221217_, p_221214_, p_221218_, p_221215_, p_364719_);
    }

    @Override
    protected void tick(BlockState p_221194_, ServerLevel p_221195_, BlockPos p_221196_, RandomSource p_221197_) {
        if (!this.canSurvive(p_221194_, p_221195_, p_221196_)) {
            this.destroyBlock(p_221195_, p_221196_);
        } else {
            this.hatchFrogspawn(p_221195_, p_221196_, p_221197_);
        }
    }

    @Override
    protected void entityInside(BlockState p_221204_, Level p_221205_, BlockPos p_221206_, Entity p_221207_, InsideBlockEffectApplier p_392110_) {
        if (p_221207_.getType().equals(EntityType.FALLING_BLOCK)) {
            this.destroyBlock(p_221205_, p_221206_);
        }
    }

    private static boolean mayPlaceOn(BlockGetter p_221188_, BlockPos p_221189_) {
        FluidState fluidstate = p_221188_.getFluidState(p_221189_);
        FluidState fluidstate1 = p_221188_.getFluidState(p_221189_.above());
        return fluidstate.getType() == Fluids.WATER && fluidstate1.getType() == Fluids.EMPTY;
    }

    private void hatchFrogspawn(ServerLevel p_221182_, BlockPos p_221183_, RandomSource p_221184_) {
        this.destroyBlock(p_221182_, p_221183_);
        p_221182_.playSound(null, p_221183_, SoundEvents.FROGSPAWN_HATCH, SoundSource.BLOCKS, 1.0F, 1.0F);
        this.spawnTadpoles(p_221182_, p_221183_, p_221184_);
    }

    private void destroyBlock(Level p_221191_, BlockPos p_221192_) {
        p_221191_.destroyBlock(p_221192_, false);
    }

    private void spawnTadpoles(ServerLevel p_221221_, BlockPos p_221222_, RandomSource p_221223_) {
        int i = p_221223_.nextInt(2, 6);

        for (int j = 1; j <= i; j++) {
            Tadpole tadpole = EntityType.TADPOLE.create(p_221221_, EntitySpawnReason.BREEDING);
            if (tadpole != null) {
                double d0 = p_221222_.getX() + this.getRandomTadpolePositionOffset(p_221223_);
                double d1 = p_221222_.getZ() + this.getRandomTadpolePositionOffset(p_221223_);
                int k = p_221223_.nextInt(1, 361);
                tadpole.snapTo(d0, p_221222_.getY() - 0.5, d1, k, 0.0F);
                tadpole.setPersistenceRequired();
                p_221221_.addFreshEntity(tadpole);
            }
        }
    }

    private double getRandomTadpolePositionOffset(RandomSource p_221225_) {
        double d0 = 0.2F;
        return Mth.clamp(p_221225_.nextDouble(), 0.2F, 0.7999999970197678);
    }

    @VisibleForTesting
    public static void setHatchDelay(int p_221179_, int p_221180_) {
        minHatchTickDelay = p_221179_;
        maxHatchTickDelay = p_221180_;
    }

    @VisibleForTesting
    public static void setDefaultHatchDelay() {
        minHatchTickDelay = 3600;
        maxHatchTickDelay = 12000;
    }
}