using System;
using System.Security.Cryptography;

namespace StellaOps.Provcache;

public sealed partial class DecisionDigestBuilder
{
    private static string ComputeHash(ReadOnlySpan<byte> data)
    {
        Span<byte> hash = stackalloc byte[32];
        SHA256.HashData(data, hash);
        return $"sha256:{Convert.ToHexStringLower(hash)}";
    }

    private static string StripPrefix(string hash)
    {
        if (hash.StartsWith("sha256:", StringComparison.OrdinalIgnoreCase))
            return hash[7..];
        return hash;
    }
}