package net.minecraft.world.level.levelgen.structure.pools.alias;

import com.mojang.serialization.Codec;
import com.mojang.serialization.MapCodec;
import com.mojang.serialization.codecs.RecordCodecBuilder;
import java.util.List;
import java.util.function.BiConsumer;
import java.util.stream.Stream;
import net.minecraft.resources.ResourceKey;
import net.minecraft.util.RandomSource;
import net.minecraft.util.random.WeightedList;
import net.minecraft.world.level.levelgen.structure.pools.StructureTemplatePool;

public record RandomGroupPoolAlias(WeightedList<List<PoolAliasBinding>> groups) implements PoolAliasBinding {
	public static final MapCodec<RandomGroupPoolAlias> CODEC = RecordCodecBuilder.mapCodec(
		i -> i.group(WeightedList.nonEmptyCodec(Codec.list(PoolAliasBinding.CODEC)).fieldOf("groups").forGetter(RandomGroupPoolAlias::groups))
			.apply(i, RandomGroupPoolAlias::new)
	);

	@Override
	public void forEachResolved(
		final RandomSource random, final BiConsumer<ResourceKey<StructureTemplatePool>, ResourceKey<StructureTemplatePool>> aliasAndTargetConsumer
	) {
		this.groups.getRandomOrThrow(random).forEach(binding -> binding.forEachResolved(random, aliasAndTargetConsumer));
	}

	@Override
	public Stream<ResourceKey<StructureTemplatePool>> allTargets() {
		return this.groups.unwrap().stream().flatMap(weightedEntry -> ((List)weightedEntry.value()).stream()).flatMap(PoolAliasBinding::allTargets);
	}

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