using System.Diagnostics.CodeAnalysis;

namespace Speckle.Connectors.Common.Threading;

[ExcludeFromCodeCoverage]
public class DefaultThreadContext : ThreadContext
{
  //should be always newed up on the host app's main thread
  private readonly TaskScheduler _uiTaskScheduler = TaskScheduler.FromCurrentSynchronizationContext();

  protected override Task<T> WorkerToMainAsync<T>(Func<Task<T>> action)
  {
    var t = Task.Factory.StartNew(action, default, TaskCreationOptions.AttachedToParent, _uiTaskScheduler);
    return t.Unwrap();
  }

  protected override Task<T> MainToWorkerAsync<T>(Func<Task<T>> action)
  {
    Task<Task<T>> f = Task.Factory.StartNew(
      action,
      default,
      TaskCreationOptions.AttachedToParent,
      TaskScheduler.Default
    );
    return f.Unwrap();
  }

  protected override Task<T> WorkerToMain<T>(Func<T> action)
  {
    var t = Task.Factory.StartNew(action, default, TaskCreationOptions.AttachedToParent, _uiTaskScheduler);
    return t;
  }

  protected override Task<T> MainToWorker<T>(Func<T> action)
  {
    Task<T> f = Task.Factory.StartNew(action, default, TaskCreationOptions.LongRunning, TaskScheduler.Default);
    return f;
  }
}