[DataContract(Name = "857d960c-4b91-49cc-98fd-fa543906c52d")]
public class CreateTask : ICommand
{
    public CreateTask() { }

    public CreateTask(TaskId id, UserId userId, string name, DateTimeOffset timestamp)
    {
        if (id is null) throw new ArgumentNullException(nameof(id));
        if (userId is null) throw new ArgumentNullException(nameof(userId));
        if (name is null) throw new ArgumentNullException(nameof(name));
        if (timestamp == default) throw new ArgumentNullException(nameof(timestamp));

        Id = id;
        UserId = userId;
        Name = name;
        Timestamp = timestamp;
    }

    [DataMember(Order = 1)]
    public TaskId Id { get; private set; }

    [DataMember(Order = 2)]
    public UserId UserId { get; private set; }

    [DataMember(Order = 3)]
    public string Name { get; private set; }

    [DataMember(Order = 4)]
    public DateTimeOffset Timestamp { get; private set; }

    public override string ToString()
    {
        return $"Create a task with id '{Id}' and name '{Name}' for user [{UserId}].";
    }
}

[ApiController]
[Route("[controller]/[action]")]
public class TaskController : ControllerBase
{
    private readonly IPublisher<ICommand> _publisher;

    public TaskController(IPublisher<ICommand> publisher)
    {
        _publisher = publisher;
    }

    [HttpPost]
    public IActionResult CreateTask(CreateTaskRequest request)
    {
        string id = Guid.NewGuid().ToString();
        string Userid = Guid.NewGuid().ToString();
        TaskId taskId = new TaskId(id);
        UserId userId = new UserId(Userid);
        var expireDate = DateTimeOffset.UtcNow;
        expireDate.AddDays(request.DaysActive);

        CreateTask command = new CreateTask(taskId, userId, request.Name, expireDate);

        if (_publisher.Publish(command) == false)
        {
            return Problem($"Unable to publish command. {command.Id}: {command.Name}");
        };
        return Ok(id);
    }
}