// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System.Diagnostics.CodeAnalysis;
using Microsoft.Extensions.Options;
 
namespace Microsoft.Extensions.Http.Logging.Internal;
 
internal static class OptionsExtensions
{
    /// <summary>
    /// Gets the options for the given service key, or the current value if the service key is <see langword="null"/>.
    /// </summary>
    /// <typeparam name="TOptions">The options type.</typeparam>
    /// <param name="optionsMonitor">The <see cref="IOptionsMonitor{TOptions}"/> to load the options object from.</param>
    /// <param name="serviceKey">An optional string that specifies the name of the options object to get.</param>
    /// <returns>The <typeparamref name="TOptions"/> instance.</returns>
    public static TOptions GetKeyedOrCurrent<[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicParameterlessConstructor)] TOptions>(
        this IOptionsMonitor<TOptions> optionsMonitor, string? serviceKey)
        where TOptions : class
    {
        if (serviceKey is null)
        {
            return optionsMonitor.CurrentValue;
        }
 
        return optionsMonitor.Get(serviceKey);
    }
}