using System;
using System.Threading;
using System.Threading.Tasks;

namespace MediaBrowser.Controller.Session;

/// <summary>
/// The single-instance <see cref="IPodMessageBus"/>: there is no other instance to reach.
/// </summary>
public sealed class NullPodMessageBus : IPodMessageBus
{
    /// <summary>
    /// Gets the shared instance.
    /// </summary>
    public static NullPodMessageBus Instance { get; } = new NullPodMessageBus();

    /// <inheritdoc />
    public string PodId => PodIdentity.Current;

    /// <inheritdoc />
    public Task<bool> RequestAsync(string targetPod, PodMessage message, CancellationToken cancellationToken = default)
        => Task.FromResult(false);

    /// <inheritdoc />
    public void Subscribe(Func<PodMessage, Task<bool>> handler)
    {
    }
}