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eagler-1-12-4
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package net.minecraft.util.random;

import java.util.List;
import java.util.Optional;
import net.minecraft.Util;
import net.minecraft.util.RandomSource;

public class WeightedRandom {
    private WeightedRandom() {
    }

    public static int getTotalWeight(List<? extends WeightedEntry> p_146313_) {
        long i = 0L;

        for (WeightedEntry weightedentry : p_146313_) {
            i += (long)weightedentry.getWeight().asInt();
        }

        if (i > 2147483647L) {
            throw new IllegalArgumentException("Sum of weights must be <= 2147483647");
        } else {
            return (int)i;
        }
    }

    public static <T extends WeightedEntry> Optional<T> getRandomItem(RandomSource p_216826_, List<T> p_216827_, int p_216828_) {
        if (p_216828_ < 0) {
            throw (IllegalArgumentException)Util.pauseInIde(new IllegalArgumentException("Negative total weight in getRandomItem"));
        } else if (p_216828_ == 0) {
            return Optional.empty();
        } else {
            int i = p_216826_.nextInt(p_216828_);
            return getWeightedItem(p_216827_, i);
        }
    }

    public static <T extends WeightedEntry> Optional<T> getWeightedItem(List<T> p_146315_, int p_146316_) {
        for (T t : p_146315_) {
            p_146316_ -= t.getWeight().asInt();
            if (p_146316_ < 0) {
                return Optional.of(t);
            }
        }

        return Optional.empty();
    }

    public static <T extends WeightedEntry> Optional<T> getRandomItem(RandomSource p_216823_, List<T> p_216824_) {
        return getRandomItem(p_216823_, p_216824_, getTotalWeight(p_216824_));
    }
}