package net.minecraft.util.random;

import com.mojang.logging.LogUtils;
import com.mojang.serialization.Codec;
import com.mojang.serialization.MapCodec;
import com.mojang.serialization.codecs.RecordCodecBuilder;
import java.util.function.Function;
import net.minecraft.SharedConstants;
import net.minecraft.Util;
import net.minecraft.util.ExtraCodecs;
import org.slf4j.Logger;

public record Weighted<T>(T value, int weight) {
	private static final Logger LOGGER = LogUtils.getLogger();

	public Weighted(T value, int weight) {
		if (weight < 0) {
			throw (IllegalArgumentException)Util.pauseInIde((T)(new IllegalArgumentException("Weight should be >= 0")));
		} else {
			if (weight == 0 && SharedConstants.IS_RUNNING_IN_IDE) {
				LOGGER.warn("Found 0 weight, make sure this is intentional!");
			}

			this.value = value;
			this.weight = weight;
		}
	}

	public static <E> Codec<Weighted<E>> codec(Codec<E> elementCodec) {
		return codec(elementCodec.fieldOf("data"));
	}

	public static <E> Codec<Weighted<E>> codec(MapCodec<E> elementCodec) {
		return RecordCodecBuilder.create(
			instance -> instance.group(elementCodec.forGetter(Weighted::value), ExtraCodecs.NON_NEGATIVE_INT.fieldOf("weight").forGetter(Weighted::weight))
				.apply(instance, Weighted::new)
		);
	}

	public <U> Weighted<U> map(Function<T, U> mapper) {
		return (Weighted<U>)(new Weighted<>(mapper.apply(this.value()), this.weight));
	}
}