public static int GetIndexBasedOnWeights(int[] array)
    {
        var total = array.Sum();

        var randVal = Random.Next(0, total + 1);

        for (var i = 0; i < array.Length; i++)
        {
            if (randVal < array[i])
                return i;


            randVal -= array[i];

        }
        return array.Length - 1;
    }