using System;
using System.Linq;
using System.Security.Cryptography;
using System.Text;

namespace BLAIzor.Helpers
{
 
    public static class VectorHashHelper
    {
        /// <summary>
        /// Computes a SHA-256 hash for a float vector and returns it as a Base64 string.
        /// </summary>
        public static string ComputeVectorHash(float[] vector)
        {
            if (vector == null || vector.Length == 0)
                throw new ArgumentException("Vector cannot be null or empty.");

            // Convert float array to byte array
            byte[] byteArray = new byte[vector.Length * sizeof(float)];
            Buffer.BlockCopy(vector, 0, byteArray, 0, byteArray.Length);

            using (var sha = SHA256.Create())
            {
                byte[] hashBytes = sha.ComputeHash(byteArray);
                return Convert.ToBase64String(hashBytes);
            }
        }

        /// <summary>
        /// Compares two float vectors by computing and comparing their SHA-256 hashes.
        /// </summary>
        public static bool AreVectorsEqual(float[] vector1, float[] vector2)
        {
            if (vector1 == null || vector2 == null)
                return false;

            if (vector1.Length != vector2.Length)
                return false;

            string hash1 = ComputeVectorHash(vector1);
            string hash2 = ComputeVectorHash(vector2);

            return hash1 == hash2;
        }
    }

}