namespace Terminal.Gui.App;

/// <summary>
///     provides the sync context set while executing code in Terminal.Gui, to let
///     users use async/await on their code
/// </summary>
internal sealed class MainLoopSyncContext : SynchronizationContext
{
    public override SynchronizationContext CreateCopy () { return new MainLoopSyncContext (); }

    public override void Post (SendOrPostCallback d, object state)
    {
        // Queue the task
        if (ApplicationImpl.Instance.IsLegacy)
        {
            Application.MainLoop?.TimedEvents.Add (TimeSpan.Zero,
                                                   () =>
                                                   {
                                                       d (state);

                                                       return false;
                                                   }
                                                  );
            Application.MainLoop?.Wakeup ();
        }
        else
        {
            ApplicationImpl.Instance.Invoke (() => { d (state); });
        }
    }

    //_mainLoop.Driver.Wakeup ();
    public override void Send (SendOrPostCallback d, object state)
    {
        if (Thread.CurrentThread.ManagedThreadId == Application.MainThreadId)
        {
            d (state);
        }
        else
        {
            var wasExecuted = false;

            Application.Invoke (
                                () =>
                                {
                                    d (state);
                                    wasExecuted = true;
                                }
                               );

            while (!wasExecuted)
            {
                Thread.Sleep (15);
            }
        }
    }
}