public static int WeightedRandom(float[] weights)
{
    float value = Random.Range(0,  weights.Sum());
    float weightSum = 0;
    for (int i = 0; i < weights.Length; i++)
    {
        weightSum += weights[i];
        if (value < weightSum)
        {
            return i;
        }
    }
    return weights.Length - 1;
}