Curve Weighted Random Unity

using System.Linq;
using UnityEngine;
using Random = UnityEngine.Random;

public class CurveRandom : MonoBehaviour
{
    private const float Step = 0.001f;
    [SerializeField] private AnimationCurve _curve;
    private void Start()
    {
        var weights = CalcWeights(5);
        for (int i = 0; i < 100000; i++)
        {
            Debug.Log(WeightedRandom(weights));
        }
    }

    private float[] CalcWeights(int itemsCount)
    {
        float[] result = new float[itemsCount];
        float curvePos = 0;
        float partSize = 1f / itemsCount;
        for (int i = 0; i < itemsCount; i++)
        {
            while (curvePos < (i + 1) * partSize)
            {
                result[i] += _curve.Evaluate(curvePos);
                curvePos += Step;
            }
        }

        return result;
    }
    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;
    }
}