minecraft-src/net/minecraft/world/level/block/CarvedPumpkinBlock.java

package net.minecraft.world.level.block;

import com.mojang.serialization.MapCodec;
import java.util.function.Predicate;
import net.minecraft.advancements.CriteriaTriggers;
import net.minecraft.core.BlockPos;
import net.minecraft.core.Direction;
import net.minecraft.server.level.ServerPlayer;
import net.minecraft.world.entity.Entity;
import net.minecraft.world.entity.EntitySpawnReason;
import net.minecraft.world.entity.EntityType;
import net.minecraft.world.entity.animal.IronGolem;
import net.minecraft.world.entity.animal.SnowGolem;
import net.minecraft.world.item.context.BlockPlaceContext;
import net.minecraft.world.level.Level;
import net.minecraft.world.level.LevelReader;
import net.minecraft.world.level.block.state.BlockBehaviour;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.level.block.state.StateDefinition;
import net.minecraft.world.level.block.state.pattern.BlockInWorld;
import net.minecraft.world.level.block.state.pattern.BlockPattern;
import net.minecraft.world.level.block.state.pattern.BlockPatternBuilder;
import net.minecraft.world.level.block.state.pattern.BlockPattern.BlockPatternMatch;
import net.minecraft.world.level.block.state.predicate.BlockStatePredicate;
import net.minecraft.world.level.block.state.properties.EnumProperty;
import org.jetbrains.annotations.Nullable;

public class CarvedPumpkinBlock extends HorizontalDirectionalBlock {
	public static final MapCodec<CarvedPumpkinBlock> CODEC = simpleCodec(CarvedPumpkinBlock::new);
	public static final EnumProperty<Direction> FACING = HorizontalDirectionalBlock.FACING;
	@Nullable
	private BlockPattern snowGolemBase;
	@Nullable
	private BlockPattern snowGolemFull;
	@Nullable
	private BlockPattern ironGolemBase;
	@Nullable
	private BlockPattern ironGolemFull;
	private static final Predicate<BlockState> PUMPKINS_PREDICATE = blockState -> blockState != null
		&& (blockState.is(Blocks.CARVED_PUMPKIN) || blockState.is(Blocks.JACK_O_LANTERN));

	@Override
	public MapCodec<? extends CarvedPumpkinBlock> codec() {
		return CODEC;
	}

	protected CarvedPumpkinBlock(BlockBehaviour.Properties properties) {
		super(properties);
		this.registerDefaultState(this.stateDefinition.any().setValue(FACING, Direction.NORTH));
	}

	@Override
	protected void onPlace(BlockState state, Level level, BlockPos pos, BlockState oldState, boolean movedByPiston) {
		if (!oldState.is(state.getBlock())) {
			this.trySpawnGolem(level, pos);
		}
	}

	public boolean canSpawnGolem(LevelReader level, BlockPos pos) {
		return this.getOrCreateSnowGolemBase().find(level, pos) != null || this.getOrCreateIronGolemBase().find(level, pos) != null;
	}

	private void trySpawnGolem(Level level, BlockPos pos) {
		BlockPatternMatch blockPatternMatch = this.getOrCreateSnowGolemFull().find(level, pos);
		if (blockPatternMatch != null) {
			SnowGolem snowGolem = EntityType.SNOW_GOLEM.create(level, EntitySpawnReason.TRIGGERED);
			if (snowGolem != null) {
				spawnGolemInWorld(level, blockPatternMatch, snowGolem, blockPatternMatch.getBlock(0, 2, 0).getPos());
			}
		} else {
			BlockPatternMatch blockPatternMatch2 = this.getOrCreateIronGolemFull().find(level, pos);
			if (blockPatternMatch2 != null) {
				IronGolem ironGolem = EntityType.IRON_GOLEM.create(level, EntitySpawnReason.TRIGGERED);
				if (ironGolem != null) {
					ironGolem.setPlayerCreated(true);
					spawnGolemInWorld(level, blockPatternMatch2, ironGolem, blockPatternMatch2.getBlock(1, 2, 0).getPos());
				}
			}
		}
	}

	private static void spawnGolemInWorld(Level level, BlockPatternMatch patternMatch, Entity golem, BlockPos pos) {
		clearPatternBlocks(level, patternMatch);
		golem.moveTo(pos.getX() + 0.5, pos.getY() + 0.05, pos.getZ() + 0.5, 0.0F, 0.0F);
		level.addFreshEntity(golem);

		for (ServerPlayer serverPlayer : level.getEntitiesOfClass(ServerPlayer.class, golem.getBoundingBox().inflate(5.0))) {
			CriteriaTriggers.SUMMONED_ENTITY.trigger(serverPlayer, golem);
		}

		updatePatternBlocks(level, patternMatch);
	}

	public static void clearPatternBlocks(Level level, BlockPatternMatch patternMatch) {
		for (int i = 0; i < patternMatch.getWidth(); i++) {
			for (int j = 0; j < patternMatch.getHeight(); j++) {
				BlockInWorld blockInWorld = patternMatch.getBlock(i, j, 0);
				level.setBlock(blockInWorld.getPos(), Blocks.AIR.defaultBlockState(), 2);
				level.levelEvent(2001, blockInWorld.getPos(), Block.getId(blockInWorld.getState()));
			}
		}
	}

	public static void updatePatternBlocks(Level level, BlockPatternMatch patternMatch) {
		for (int i = 0; i < patternMatch.getWidth(); i++) {
			for (int j = 0; j < patternMatch.getHeight(); j++) {
				BlockInWorld blockInWorld = patternMatch.getBlock(i, j, 0);
				level.blockUpdated(blockInWorld.getPos(), Blocks.AIR);
			}
		}
	}

	@Override
	public BlockState getStateForPlacement(BlockPlaceContext context) {
		return this.defaultBlockState().setValue(FACING, context.getHorizontalDirection().getOpposite());
	}

	@Override
	protected void createBlockStateDefinition(StateDefinition.Builder<Block, BlockState> builder) {
		builder.add(FACING);
	}

	private BlockPattern getOrCreateSnowGolemBase() {
		if (this.snowGolemBase == null) {
			this.snowGolemBase = BlockPatternBuilder.start()
				.aisle(" ", "#", "#")
				.where('#', BlockInWorld.hasState(BlockStatePredicate.forBlock(Blocks.SNOW_BLOCK)))
				.build();
		}

		return this.snowGolemBase;
	}

	private BlockPattern getOrCreateSnowGolemFull() {
		if (this.snowGolemFull == null) {
			this.snowGolemFull = BlockPatternBuilder.start()
				.aisle("^", "#", "#")
				.where('^', BlockInWorld.hasState(PUMPKINS_PREDICATE))
				.where('#', BlockInWorld.hasState(BlockStatePredicate.forBlock(Blocks.SNOW_BLOCK)))
				.build();
		}

		return this.snowGolemFull;
	}

	private BlockPattern getOrCreateIronGolemBase() {
		if (this.ironGolemBase == null) {
			this.ironGolemBase = BlockPatternBuilder.start()
				.aisle("~ ~", "###", "~#~")
				.where('#', BlockInWorld.hasState(BlockStatePredicate.forBlock(Blocks.IRON_BLOCK)))
				.where('~', blockInWorld -> blockInWorld.getState().isAir())
				.build();
		}

		return this.ironGolemBase;
	}

	private BlockPattern getOrCreateIronGolemFull() {
		if (this.ironGolemFull == null) {
			this.ironGolemFull = BlockPatternBuilder.start()
				.aisle("~^~", "###", "~#~")
				.where('^', BlockInWorld.hasState(PUMPKINS_PREDICATE))
				.where('#', BlockInWorld.hasState(BlockStatePredicate.forBlock(Blocks.IRON_BLOCK)))
				.where('~', blockInWorld -> blockInWorld.getState().isAir())
				.build();
		}

		return this.ironGolemFull;
	}
}