// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System;
using System.Security.Cryptography;

namespace Microsoft.AspNetCore.Mvc.ViewFeatures
{
    // Used to produce a monotonically increasing sequence starting at 0 that is unique for the scope of the top-level page/view/component being rendered.
    internal class ServerComponentInvocationSequence
    {
        private int _sequence;

        public ServerComponentInvocationSequence()
        {
            Span<byte> bytes = stackalloc byte[16];
            RandomNumberGenerator.Fill(bytes);
            Value = new Guid(bytes);
            _sequence = -1;
        }

        public Guid Value { get; }

        public int Next() => ++_sequence;
    }
}
